Loading...
Welcome to Metal Mine! Today is Share:

Table of Content

    15 July 2014, Volume 43 Issue 07
    Previous Issue    Next Issue
    Optimization on Structural Parameters of Pillarless Sublevel Caving in Steep Narrow Veins
    LI Kun-Meng, LI Yuan-Hui, XU Shuai, CHEN Zong-Ling, WU Jin
    2014, 43(07):  1-6. 
    Asbtract ( 1170 )   PDF  
    Related Articles | Metrics
    Taking 18# ore-body of steep narrow vein in Jinchanggouliang gold mine as the basis，it is measured that the single drain port face-end ore-drawing bodies are cut by hanging-foot side wall and end wall under incline side wall condition by physical simulation experiment.The drawn ore-body is irregular in sharp and inclines forwards to the end wall and the hanging wall.The funnel that is formed by ore-rock contact surface shows as a 1/4 standard funnel of a whole besides little cutting by the footwall.Waste rock in bulk flow process mixes along the hanging wall and end wall，and ore loss at footwall are huge.To improve the flow properties of bulk and reduce the loss and dilution of ore，the optimal layout of ore drawing route is designed，that is，it should be arranged along the footwall vein and try to approach the drawing equipment to the footwall.Based on the flow law of bulk discovered，the bulk flowing may be divided into three zones of free fall zone，transition zone，and tilted side wall control zone in the height direction.Following the principle of the segment height being controlled within the transition zone，and considering the capacity of drilling equipment，the actual corresponding optimal segmentation height should be determined to be 12m and 14m.Finally，numerical simulation method was applied to optimize and obtain minimum safe distance of haulage drifts at 6m.The study provides technical support for efficient and safe mining of similar steep narrow veins.
    Mining Structure Model of Typical Residual Ore and Its Stability Analysis
    JIANG Li-Chun, ZHAO Dong-Li
    2014, 43(07):  7-11. 
    Asbtract ( 1219 )   PDF  
    Related Articles | Metrics
    Based on a residual ore mining project，a typical residual mining area is selected to establish structure models.The stability of stope roof was studied by using beam theory and FLAC3D software，which combined with damage theory of permissible limits of displacement.Then，the stability of these models was comprehensively evaluated through finding the similarities and differences of the beam theory and the numerical simulation.At last，the research findings were verified by on-site tests.The research shows that the mining structure models of residue ores can basically reflect the actual situation that the residual ore mining operations are adjacent to goafs and breakout zone.And structure model Ⅰ and model Ⅱ are stable，but model Ⅲ is unstable，which means that the corresponding stoping scheme of model Ⅰ is feasible，the corresponding region of model Ⅱ is stable and the corresponding stoping scheme of model Ⅲ needs to make adjustments.Furthermore，there is no significant difference between beam theory′s and numerical simulation′s results，which is consistent with the results of on-site survey.Combination of both beam theory and numerical simulation can achieve good results.
    Optimization Method of Management Sequence of Retained Goaf Backfilling in Iron Deposit
    LU Hong-Jian, ZHAO Yong-Shuang, GAO Feng, LI Jia-Hui
    2014, 43(07):  12-16. 
    Asbtract ( 1234 )   PDF  
    Related Articles | Metrics
    Combining current situation of retained goaf in typical mine，taking a combination of site investigation and numerical analysis to invert the forming process of retained goaf in the mine，and based on the analysis of mechanical response law of rock，optimization method of management sequence of retained goaf in iron deposit was put forward，which took the rock stress concentration grade and the surface deformation influence as main evaluation factors.Conclusions were as follows:①Surface subsidence changed significantly with each level of goaf formed，from small partial settlement developing into large failure zone.Maximum displacement occurred above goaf，and the settlement value ranged between 12.8 and 16.2 cm.②Each level of goaf surrounding rock stands compressive stress.Maximum stress occurred in the goaf side-wall，and tensile stress was formed in goaf surrounding rock with a large area exposed.So it should be treated as a priority.③Optimization method of management sequence of retained goaf was put forward，which had important guiding significance in treatment of retained goaf，pillar recovery，determination of deep mining scheme and safe production in underground metal mine.
    Optimization of Lower Horizontal Development and Transport System During the Internal Drainage in Haerwusu Surface Mine
    NIU Jing-Fu, YANG Fei, ZHOU Wei, ZHANG Xu-Jie
    2014, 43(07):  17-21. 
    Asbtract ( 1378 )   PDF  
    Related Articles | Metrics
    According to production practices of Haerwusu Surface Mine,learning from other mines′ advanced experience about the transport system,the idea for building a middle-style “bridge” to form an intermediate bridge transport system at “center of gravity” of stripping materials between work slope and non-work slope is put forward.In accordance with the mine production status of beach pinchout,using mathematical modeling method,the trapezoidal model of stripping materials in the lower level of the mine was established.Then,the model for movement of materials was divided into two parts,the middle bridge transport and the end slope transport.Further comparison with the traditional bridge was made from aspects of automobile transport distance,transport costs,and other economic benefits.The study showed that it is the most economical and reasonable to build the transport bridge along the “center of gravity” in lower level of Haerwusu surface mine.It can reduce the transport work of internal drainage by 29 Mm3·km,and achieves steep end-slope mining.By this method,more than 448 000 t of additional coal resources are recovered each year with overall annual increase of 82.522 Millions yuan in economic benefit.
    Numerical Simulation of Paste Backfill Control on Surface Subsidence by Particle Flow
    ZHANG You-Zhi, WU Ai-Xiang, WANG Hong-Jiang, LI Tao, SUN Wei, YAN Qi-Pan
    2014, 43(07):  22-26. 
    Asbtract ( 1109 )   PDF  
    Related Articles | Metrics
    With the surface subsidence areas of a mine as engineering background，and based on particle flow method and PFC2D，numerical simulations on a variety of backfill schemes in surface subsidence areas are carried out.The migration rule of backfill disposal paste under different kinds of backfill schemes was obtained，which can optimize and select backfill technology effectively.The results are shown as follows：in the process of mining under subsidence areas，the subsidence of backfill disposal paste in fully cemented backfill scheme is minimum，which shows the best subsidence control effect.Stratified backfill scheme takes second and completely non-cemented backfill scheme is the worst;Using the paste backfill in surface subsidence can form stress arch in disposal paste and the surrounding rock mass which can pass stress and has a good control effect on the stability of the surface subsidence; Separation factor in completely non-cemented backfill scheme is minimum，0.12%，which makes the best contact efficiency between disposal paste and bottom of the pit.The separation factor is maximum，0.18% in fully cemented backfill scheme，showing the worst contact efficiency.The rest schemes have similar separation factors，0.15%，0.16% and 0.148%，and its contact efficiency is located between the former two respectively.
    Influence of the Properties of Binders on Unconfined Compressive Strength of Total Tailings Cemented Backfill Material
    ZHENG Juan-Rong, WANG Su-Wei
    2014, 43(07):  27-31. 
    Asbtract ( 1138 )   PDF  
    Related Articles | Metrics
    Influence of the properties of binders on unconfined compressive strength (UCS) of total tailings cemented backfill(TTCB) was investigated.The total porosity and pore size distribution of the samples were measured by using a mercury intrusion porosimeter (Autopore Ⅳ9500）(MIP).The results showed that when the solid concentration of TTCB slurry was respectively 70%,78% and 86% with the binder content of 10% （by total mass of solid）,the UCS of samples with slag cement was respectively 151%,127% and 90% higher than that of samples with 100% portland cement.When the solid concentration of TTCB slurry was 86% and the binder content was 5%,the 7 d,14 d，28 d UCS of samples with slag cement were respectively 68%,97% and 141% higher than that of samples with 100% portland cement.When the solid concentration of TTCB slurry was 86% and the binder content was respectively 5%,10%,20%,30% and 40%,the 28 d UCS of samples with slag cement was respectively 127%,89%,10%,-12% and -21% higher than that of samples with 100% portland cement.Based on MIP data and UCS results,the conclusion was that under the condition of high water-binder ratio（w(W）/w(B)>0.65）,the pore size of the sample with slag cement was finer(i.e.hydration product was more or more dispersing) than that of the sample with 100% portland cement so that the increasing bonding area among aggregates (including powder fill) with slag cement increases the UCS of the sample.Under the condition of low water-binder ratio,the total porosity of the sample with slag cement was greatly higher than that of the sample with 100% portland cement so that the decreasing bonding strength of aggregates (including powder fill) in sample with slag cement lowers the 28 d UCS.
    Optimization of AHP-Fuzzy Parameters in Shallow Hole Room and Pillar Mining Method with Subsequence Filling
    CHEN Chang, TAN Zhuo-Ying, CHEN Shou-Xue, HUANG Zhen-Jin, XIE Zhi-Qian, LI Chao-Hui
    2014, 43(07):  32-36. 
    Asbtract ( 1508 )   PDF  
    Related Articles | Metrics
    According to the occurrence condition of Yongping orebody and the firmness of rocks，the shallow-hole room and pillar mining method with subsequence filling is adopted.For this，three kinds of mining schemes for pillar and chamber′s design was put forward.Since there are many fuzzy information in practical engineering of the shallow hole room and pillar mining method with subsequence filling，the analytic hierarchy fuzzy comprehensive evaluation method (AHP-Fuzzy) was used to optimize the stope structure parameters，in order to realize the safe mining，economic and efficient development.With the aid of AHP method，AHP and Fuzzy comprehensive evaluation method can be used to construct judgment matrix and determine the level of the index weight; Then，with the method of fuzzy mathematics，and fully considering the practical engineering experience，the membership degree matrix influencing the mining scheme was proposed.According to the weight vector and the membership degree matrix，the comprehensive evaluation vector is determined，and the optimal scheme is given.This method comprehensively considers the influence of various factors，and combines with the quantitative and the qualitative analysis.It fully reflects the fuzziness of the evaluation factors and evaluation process，and reduces the subjective influence on evaluation，and improves the credibility of evaluation.Optimization results show that the scheme 2 owns comprehensive superiority degree of 92.52%，and is superior to other two schemes，so the scheme 2 is the optimal one.
    Key Factors Affecting Pumpability，Strength and Rebound Rate of Wet Shotcrete
    HAN Bin, YAO Song, YU Shao-Feng, WU Jian-Xun, LI Jia-Meng
    2014, 43(07):  37-41. 
    Asbtract ( 1440 )   PDF  
    Related Articles | Metrics
    To promote the application of wet shotcrete technology in mines and improve its supporting effect，three key factors of affecting pumpability，strength，and rebound rate of wet shotcrete were deeply investigated based on numerous indoor experiments and several years field experiences in wet shotcrete.The influencing factors for pumpability and strength of wet shotcrete were introduced in detail，including dosage of cement，strength of aggregate and its size composition，dosage of silica fume，type and dosage of fiber，type and dosage of accelerator and water reducer，and water-cement ratio etc..The internal relationship between rebound rate of wet shotcrete and water-cement ratio，dosage of accelerator，distance and angle of spray gun and drift surface were analyzed.The application of wet shotcrete in Banmiaozi gold mine showed that the rebound rate of wet shotcrete is 10% in general，its Uniaxial compressive strength (UCS) for 28 d is 36.2 MPa，and its flexural strength is 3.2 MPa.These indexes are considerably better than that of dry shotcrete.So，the wet shotcrete technology is the developing tendency of shotcrete.
    Cutting Mining Plan and Stability Analysis of Easily-sliding End-slope
    SONG Jing-Hui, HOU Jiao-Long, MAO Yong-Xiang
    2014, 43(07):  42-45. 
    Asbtract ( 1180 )   PDF  
    Related Articles | Metrics
    The end-slope stability of surface coal mine is the main influencing factor of affecting the coal recovery beneath the end-slope.Both of ensuring end-slope stability and recovering coal resources beneath end-slope to the great limit meet the development goals of safety production and economic efficient of surface coal mine.In order to solve the problem in recovering coal resources of easily-sliding end-slope in open-pit mine，and based on the theory of timeliness and steep end-slope mining，two new mining methods of cutting steep end-slope in vertical and parallel were proposed.Basic modes of determining cutting end-slope width were also analyzed.Taking one surface coal mine in the south of our country for example，end-slope stability with different width of cut mining were analyzed by using FLAC3D numerical simulation software.The result showed that stability of cutting steep end-slope in vertical decreases with cutting width increasing，and the cut steep end-slope mining can greatly reduce the risk of slope instability and effectively recover residual coal resources of easily-sliding end-slope compared with the all-width steep end-slope mining.The analysis of slope stability improved the related theory of timeliness end-slope mining to a certain extent.
    Evaluation on Locations′ Selection of the First Mining Area and Open Segment Ditch in Open-pit Mine
    SUN Yu-Ting, CAI Qing-Xiang
    2014, 43(07):  46-50. 
    Asbtract ( 1367 )   PDF  
    Related Articles | Metrics
    Selection of locations of the first mining area and open segment ditch，one of the important links in open pit production，plays a significant role in improving the initial economic benefits and connecting the production in subsequent mining areas.However，due to many factors affecting the selection above，it is difficult to draw the optimal conclusion by the single parameter evaluation system.Taking an open pit mine for instance，eight indicators were selected to establish evaluation index system and comprehensive evaluation model was built by adopting TOPSIS.Then，the most reasonable location was determined.The evaluation result showed that compared with the single parameter evaluation system，the evaluation index system by TOPSIS became easier，more scientific and more reliable.The research methods and ideas used in the research have some reference values for determining reasonable locations of the first mining area and open segment ditch in other similar open pit.
    Failure Types and Damage Scale Analysis of Bench Slope based on Geometrical Characteristics
    GU Fei-Hong
    2014, 43(07):  51-55. 
    Asbtract ( 1207 )   PDF  
    Related Articles | Metrics
    Failure of bench slope is the main type of mine slope failure.The bench slope′s stability is influenced by the distribution and occurrence of structures，even its failure scale has a great relationship with geometrical characteristics of bench slope.The analysis of geometrical characteristics of rocky bench slope showed that the maximum width of bench slope is the decisive factor for determining the scale of slope failure.The slope toe with maximum width is largest control point which determines to the boundary conditions of different damage scales.And the boundary conditions of damage scale in the condition of different bench slope were obtained.Compared with the traditional method used to qualitatively analyze the bench slope，the modified method can get the failure types of slopes，and acquire the damage scale of each failure type as well.It is very convenient to find out the main structure or structures′ combination of bench slope.Further analysis and calculation is made to provide the qualitative assessment of the influence area of slope failure according to the possible damage scale of slope failure and provides accurate target for calculation of stability coefficient.The modified method improves the efficiency in analysis and calculation of rocky slope stability，and provides guidance and basis for safe production in mine.
    Research of Iron Ore Market Based on Market Structure and Market Power
    SHI Xiu-Hua, WAN Chang-
    2014, 43(07):  56-60. 
    Asbtract ( 1096 )   PDF  
    Related Articles | Metrics
    China′s rapid economic development，greatly increased the demand for resources commodity.Since 2003，China became the largest iron ore importer in the world，but has no power of making price and voice in the international iron ore trade market.The reason that this happened is highly connected with current international iron ore market structure and market power.From the angle of industrial organization theory，the main concepts were introduced，such as market concentration and Lerner index，and the international iron ore market structure and market power were studied.The international iron ore market pricing model and its forming process were reviewed.Combining with the current situation of the development of China′s iron ore market， some strategies were put forward such as broadening the import channel and establishing a diversified supply system; From the angle of resource safety，a sound system of iron ore reserves should be built; Integration of domestic iron ore market can strengthen cooperation between enterprises; Integration of the domestic iron and steel enterprises can improve market concentration; Meanwhile，the development of iron ore futures market should be sped up as well.
    Stepped Flotation of Donganshan Mixed Iron Magnetic Concentrate at Normal Temperature Using a New Collector DTX-1
    ZHU Yi-Min, CHEN Jin-Xin, REN Jian-Lei, WANG Ting-Xia
    2014, 43(07):  61-64. 
    Asbtract ( 1209 )   PDF  
    Related Articles | Metrics
    With the increase of siderite content in raw iron ore,the iron grade and recovery of the reverse flotation concentrate derived from Donganshan mixed magnetic concentrate was decreased.In order to well develop the high siderite iron ore resources,and improve the reverse flotation concentrate index,a new modification fatty acids collector DTX-1 synthesized by Northeastern University was used in stepped flotation of the mixed magnetic concentrate,Donganshan Dressing Plant,at room temperature.The results showed that mixed magnetic concentrate of Donganshan Dressing Plant,were treated by the closed-circuit process of siderite concentration by one direct flotation,and desilication by reverse flotation of one roughing,one cleaning,two scavenging and middles back to the flow-sheet,iron concentrate with iron grade of 65.87% and recovery of 67.92% was achieved.Comparing with the concentrate index of on-site reverse flotation process of one roughing,one cleaning and three scavenging,iron grade and recovery of concentrate was increased by 2.47 and 2.82 percentage points respectively,iron concentrate index is improved remarkably with relative complex mineral processing operation.
    Reverse Flotation Process Optimization of Mixed Magnetic Concentrate from a Iron Mine of Hebei
    ZHAO Yi, PENG Hui-Qing, QIN Lei, LIAO Xiang, ZHOU Xin-Jun
    2014, 43(07):  65-68. 
    Asbtract ( 1130 )   PDF  
    Related Articles | Metrics
    Indicators of reverse flotation concentrate from mixed magnetic concentrate from a Iron Mine of Hebei province,are not satisfactory,mainly due to inadequate monomer dissociation and unsatisfactory reverse flotation performance.On-site mixed magnetic iron concentrate was treated by reverse flotation in order to increase effect of iron increase and silicon reduction operation.The results showed that iron concentrate with iron grade of 63.98% and iron recovery of 81.60% was gaind at the grinding fineness of 80.48% passing 0.043 mm through the process of one roughing,one cleaning,two scavenging,and middles back to the flowsheet in turn process.Compared with the on-site process,the new process increases regrinding operation of the mixed magnetic concentrate,decreases the number for cleaning and scavenging by one time.By this method,iron grade and iron recovery are increased by 1.70 and 11.01 percentage points respectivley.The beneficiation indicators were improved significantly.
    Optimization of Copper Beneficiation for a Copper Dressing Plant in Jiangxi
    LIAO Xiang, PENG Hui-Qing, SHAO Hui, CHEN Ming-Yu, ZHAO Yi, ZHOU Xin-Jun, QIN Lei
    2014, 43(07):  69-73. 
    Asbtract ( 1339 )   PDF  
    Related Articles | Metrics
    Under the influences of fine and complicated dissemination,high rate of copper oxidation of the ore,the production indexes in a large copper mine in Jiangxi constantly keeps falling. In order to solve the problems existing in on-site process,beneficiation tests were carried out by the process of partially preferential copper flotation Cu-S bulk flotation at coarser grinding fineness,separation of copper and sulphur for regrinding of Cu-S bulk flotation products. The experiment result indicated that with the one-stage grinding fineness of 68% -0.074 mm,copper concentrate with copper grade of 22.79% and copper recovery rate of 86.04%,and sulphur concentrate with sulphur grade of 43.86% and sulphur recovery rate of 58.73% were gained respectively by adopting the closed-circuit process of fast preferential copper flotation by one roughing and one cleaning,sulphur-copper bulk flotation by one roughing and one scavenging,separation of copper and sulphur by one roughing,one cleaning and one scavenging after regrinding mixed concentrates of the middling of preferential copper flotation and the primary concentrate of the bulk flotation to 98.07% -0.074 mm,and middles back to the regrinding. Compared with the production indexes,the copper grade of the copper concentrate was increased by 1.46 percentage points,and the copper recovery rate was increased by 3.60 percentage points,so the indexes were improved significantly.
    Beneficiation Experiment on a Low Grade Copper-molybdenum Ore from Chifeng
    ZHANG Wen-Jun, CHENG Fu-Chao, CHEN Ying-Ying, ZENG Xian-Wei
    2014, 43(07):  74-78. 
    Asbtract ( 1210 )   PDF  
    Related Articles | Metrics
    Cu-Mo minerals mainly exist in form of sulfide ore and closely associated with each other in fine dissemination in a large-scale porphyry low grade copper-molybdenum deposit in Chifeng.In order to realize high efficient development and utilization of the ore,conditioning tests of mineral processing for the ore were carried out.The results showed that,under the optimum grinding fineness for copper and molybdenum mixed flotation at 0.074 mm passing 70%,grinding fineness for copper and molybdenum separation at 0.043 mm passing 80%,copper concentrate with copper grade of 17.51%,copper recovery of 81.25%,and molybdenum concentrate with molybdenum grade of 42.41%,molybdenum recovery of 88.35% were obtained through closed-circuit process of one roughing,two cleanings,one scavenging and middles back to the flow-sheet in turn for copper and molybdenum mixed flotation,and the closed-circuit process of one roughing,five cleanings,two scavengings and middles back to the flow-sheet in turn for copper and molybdenum separation flotation.
    Experiment of Inhibiting Mg and Floating Copper-nickel by Jointly Using Complexing Agent-Inhibitors
    HUANG Jun-Wei, ZHANG Ya-Hui, ZHANG Cheng-Qiang, LI Hong-Chao, ZHANG Hong-Xin
    2014, 43(07):  79-83. 
    Asbtract ( 1267 )   PDF  
    Related Articles | Metrics
    In order to decrease the MgO content in floated copper-nickel concentrate of Northwest copper-nickel sulfide with high magnesium content，the tests on improving quality and decreasing magnesium content for the raw ores containing 1.29% nickel,0.87% copper,29.02% MgO were carried out by using disodium EDTA as Cu2+,Ni2+ complexing agent and sodium hexametaphosphate and JC as inhibitors for Mg-containing gangues.The results showed that,by the closed-circuit process of one roughing，two cleaning，three scavengings，middlings returning in proper order into the flow,final copper-nickel mixed concentrate with Ni grade of 8.95% ,Cu grade of 5.21%,nickel recovery of 82.91%,copper recovery of 71.56%，and MgO content of 6.13% was obtained.Compared with the on-site beneficiation process，the optimized process could decrease the middles regrinding operation and simplify the flotation process,while the Ni and Cu grade of final copper-nickel mixed concentrate were improved by 0.28 and 0.71 percentage points,and the nickel and copper recovery were improved by 0.35 and 1.38 percentage points respectively.MgO content was reduced by 0.59 percentage points.The optimizing process achieved good effect of beneficiation.
    Experiment on Lead-Zinc Separation of a Refractory Lead-Zinc Ore from Guangxi
    WU Di, PENG Hui-Qing, SHAO Hui, CHEN Ming-Yu
    2014, 43(07):  84-88. 
    Asbtract ( 1142 )   PDF  
    Related Articles | Metrics
    A lead-zinc mine in Guangxi belongs to refractory mine with low lead of 0.88% and high zinc of 9.19% in fine dissemination. The main Zn-containing mineral is sphalerite,and Pb-containing minerals are complex,including jamesonite,boulangerite and galena in very fine dissemination. In order to realize the high efficient exploitation and utilization of the resources,beneficiation tests of lead and zinc separation of the ore were made. Results showed that under the grinding fineness of 80% -0.074 mm,zinc concentrate with Zn grade of 48.05% and zinc recovery of 91.13%， and lead-antimony concentrate with lead grade of 26.63%， antimony grade of 21.80%， lead recovery rate of 87.46% and antimony recovery of 86.30% were obtained respectively by the process of lead concentration by one roughing，two scavenging and three cleaning，zinc concentration by one roughing，two scavenging and three cleaning，mixture of one cleaning of lead-zinc tailing and one scavenging of lead-zinc concentrate back to regrinding，and the rest middlings back to the flow-sheet in turn. The reason for low content of lead in lead-antimony concentrate is that the main lead-containing minerals，jamesonite and boulangerite，contain low lead content in theory with fine disseminated particle，which are not suitable for fine grinding and deep concentration.
    Application of a New Chelating-Agent Collector On Benficiation of a Lead-zinc Oxide Ore in Yunnan
    WANG Zu-Xu
    2014, 43(07):  89-93. 
    Asbtract ( 1122 )   PDF  
    Related Articles | Metrics
    With high lead,zinc and silver content reaching 58.31%, 22.79% and 352.90 g/t,respectively,the oxidized lead zinc ore in Yunnan is mainly constituted by hemimorphite and cerussite.In order to resolve problems brought by mixed lead and zinc during metallurgical process of this ore,froth floatation experiments have been performed to separate hemimorphite and cerussite in it and a new chelating-agent collector named C6403 has been employed in the experiments to improve floatation index.As the results show,a lead concentrate with lead grade of 42.04%, zinc grade of 9.63%,silver grade of 668.15 g/t,lead recovery of 83.22% and silver recovery of 66.23%, and a zinc concentrate with zinc grade of 43.51%, lead grade of 4.56%, silver grade of 183.30 g/t,zinc recovery of 89.36% and silver recovery of 33.77% were obtained by adopting the closed circuit process of three roughing,two cleaning,and middles back to the flow-sheet.Ultimately,both lead concentrate and zinc concentrate can meet requirements of smelting plants.
    Flotation Separation of Scheelite and Fluorite from Tungsten Minerals with High Calcium at Room Temperature
    XIE Guang-Cai, LIAO De-Hua, CHEN Xiang
    2014, 43(07):  94-97. 
    Asbtract ( 1152 )   PDF  
    Related Articles | Metrics
    A sulfur skarn tungsten ore resources in Hunan owns complex composition,and the main useful minerals are scheelite and fluorite.In order to high efficiently develop and utilize the ore,beneficiation tests on the ore were carried out.The results showed that under the case that silicate with modulus of 2.8 is mixed with scheelite concentrate 1 with pulp density of 50% for 1.5 h,and through four cleanings flotation at room temperature,the WO3 grade of scheelite was effectively improved.Under the grinding fineness of -0.074 mm 80%,sulfure was removed through one open circuit flotation.Scheelite concentrate from the desulfurized product was achieved through the closed-circuit process of one roughing,two scavenging,five cleaning and middles back to the flow-sheet in order.Fluorite was obtained from tailings above through closed circuit process of one roughing,two scavenging,five cleaning and middles back to the flow-sheet in order.Finally,scheelite concentrate with WO3 grade of 58.26% and WO3 recovery of 92.89%,and fluorite concentrate with CaF2 grade of 98.36% and recovery of 89.85% were achieved respectively.The closed-circuit process realized a low-consumption and high-efficiency recovery of the ore.
    Effect of Aluminum (Ⅲ) on the Activity of Mixed Bacteria in Bioleaching of Uranium
    HAN Wen-Yan, GUO Qin, SUN Zhan-Xue, LIU Ya-Jie, SHI Wei-Jun, ZHAO Zhi-Bin
    2014, 43(07):  98-100. 
    Asbtract ( 1284 )   PDF  
    Related Articles | Metrics
    In the process of leaching of uranium，Al3+ is found to form a complexation with fluorine,hence reduce the negative influence on uranium leaching. In order to better understand the influence of Al3+ on bacterial activity,bacteria growth cycle and oxidation rate of Fe2+ influenced by the concentration of Al3+ and the influence mechanism of the ion concentration on bacterial growth are investigated. The results show that: ①the activity of mixed bacteria is closely related to the concentration of Al3+. When the concentration of Al3+ is less than 8 g/L,the influence of Al3+ on oxidation capability and growth cycle of the mixed bacteria is very small; With the concentration increasing,its influence is getting more and more significant,and inhibition of mixed bacteria growth is more and more obvious.②When the concentration of Al3+ is less than 8 g/L,mixed bacteria show a stronger ability to regulate metabolism,namely by changing or adjusting the metabolic pathways to adapting to the new environment to some extent. Therefore,when usage of Al3+ is required for uranium bacteria leaching,its concentration should not exceed 8 g/L.
    Sulphating Roasting-Ultrasonic Leaching Test of Vanadium-containing Stone Coal
    YANG De-Qin, LIANG Xiao-Feng, GUO Xue, LI Hai-Jian, WANG Cui-Ling, YANG Shi-Yuan
    2014, 43(07):  101-105. 
    Asbtract ( 1205 )   PDF  
    Related Articles | Metrics
    In order to solve the problems caused by traditional process of vanadium extraction,such as high pollution,high acid consumption,low vanadium leaching rate,regarding the stone coal from Hunan province as the research target,the conditioning tests of vanadium extraction were investigated by sulphating roasting-ultrasonic extraction.The results showed that when the stone coal was firstly treated with 18% sulfuric acid (mass ratio with stone coal),liquid-to-solid ratio at 1.2∶1 mL/g at 240 ℃ for 2.5 h,and then the roasted ore is treated by ultrasonic leaching with 8% phosphoric acid (mass ratio with stone coal),liquid-to-solid ratio at 2∶1 mL/g,and ultrasonic power of 100 W at 80 ℃ for 60 min,the leaching rate of vanadium reached 88.21%.Compared with the process of sulphating roasting-mechanical stirring leaching and the process of calcified roasting-ultrasonic leaching,the process had a better performance.The main reason was that agitation,cavitation,thermal and chemical effects of ultrasonic wave contributed to change the aggregation state of vanadium and accelerate the leaching of vanadium,so that the vanadium leaching was more sufficient.
    Decollement Structures and Its Relationship with Mineralization in Getang Gold Deposit in Guizhou Province
    WU Song-Yang, DING Jun, CHEN Ming, HOU Lin, ZHANG Jin-Rang
    2014, 43(07):  106-109. 
    Asbtract ( 1404 )   PDF  
    Related Articles | Metrics
    According to the field survey of geological phenomenon in Getang Gold deposit，the ore body of the deposit mainly occurs in the ancient karsts surface which is upon the Maokou formation，Section 1 of Longtan formation is the major ore-bearing layer.Both of ancient karsts side and the surface between the section three and four of Longtan formation are slip-sheet structure，the lithological combination of the second and third section of Longtan formation are clay stone with carbon and siltstone and this two sections are the intensified layer.The imbricate structure system is formed during the tectonic movement process between Indo-Chinese epoch and Yanshan epoch.During this period，the direction of regional pressure is changed from north-south to east-west，and the imbricate structure system is the result of multiphase tectonic movement.The fracture surface of imbricate thrust fault which is formed in the intensified layer is in a condition of maximum stress and closed extrusion，and this condition has disadvantage of the migration of ore-forming fluid.Additionally，poor water permeability of the rock plays a role of geochemical barrier to ore fluid，which provides the favorable conditions to the ore-forming of ore-bearing solution in the slip-sheet structure.Moreover，carbon exists in the intensified layer and becomes upward thinning.When the ore-bearing fluid flow through，the value of pH will be changed，the concentration of gold in fluid will be increased，and gold will be extracted from the clathrate and adsorbed by the carbon.Only relatively less mineral flow into the intensified layer，so just mineralization is found instead of ore body.
    Magnetic Anomaly Characteristics of Vanadium-titanium Magnetite Ore Deposit in Baima Region，Panzhihua
    WANG Kai-Yang, TUO Xian-Guo, XIE Yi-Feng, LIU Yan-Song, HE Zheng-Wei
    2014, 43(07):  110-113. 
    Asbtract ( 1159 )   PDF  
    Related Articles | Metrics
    The results of regional aeromagnetic survey and ground high-precision magnetic prospecting of Baima vanadium-titanium magnetite mining area in Panzhihua are investigated comprehensively.In addition，the explored mineralization region is verified and analyzed and the matching relationships between mineral information and anomaly characteristics of aeromagnetic and ground magnetic survey are summarized.Besides that，the prospecting evaluation on the unexplored areas is done and the regular pattern of magnetic anomaly that is related to the ore-controlling factors in Baima mining area is drawn.The research results show that there is a higher level of vanadium-titanium magnetic anomaly in Baima mining area，and obvious regional magnetic anomaly.Magnetic prospecting method has played a great role in classification of rock mass，tectonic unit，tectonic position and direct prospecting.The research also provides some reference of magnetic anomaly characteristics for resolving the deep prospecting problems and building up a geophysical ore-prospecting model.
    Element Composite Anomalies and Prospecting Direction in Lawu Deposit，Tibet
    LAN Shuang-Shuang, GUO Xiu-Mei, LI Guang-Ming, MA Guo-Tao
    2014, 43(07):  114-117. 
    Asbtract ( 1184 )   PDF  
    Related Articles | Metrics
    Through the analysis on the elements geochemical data of Lawu Cu-Pb-Zn polymetallic deposit in Tibet，it is shown that the ore-forming elements are not evenly distributed in geological bodies.The correction analysis method and cluster analysis method are adopted to investigate the geochemical elements in the deposit.It is found that the nine elements such as Cu，Pb，Zn， Ag， Bi，Au，Hg，Sb，As have positively correlation with each other and the Cu-Pb-Zn-Ag-Bi combination associated with Cu-Pb-Zn mineralization.Anomaly areas of Cu-Pb-Zn-Ag-Bi are delineated through the anomaly threshold.Three superimposed abnormal areas with potential ore-prospecting are identified.The elements anomalies superimposed of Cu-Zn-Pb-Bi-Ag are significant，and the elements anomaly concentration concentrates on the No.1 anomaly area，hence，the area has potential in seeking for skarn ore deposit.According to the chemical results of soil samples in No.2 anomaly area，the element anomaly value of Pb is 3 800×10-6，the element anomaly value of Zn is 5 000×10-6，therefore，the area has potential in searching for low-temperature hydrothermal Pb-Zn ore deposit.The No.3 area is affected by the fault reformation and the late magma intrusion，so，there is high abnormal Cu in the area and the element grade of Cu is 0.2%，therefore,the area has potential in searching for Cu ore deposit.
    Application of High-precision Magnetic Survey Method in Exploration of Qidashan Iron Ore Deposit
    WANG Hai-Long, JIA San-Shi, ZHANG Jian-Ming
    2014, 43(07):  118-121. 
    Asbtract ( 1179 )   PDF  
    Related Articles | Metrics
    Based on the basic geological characteristics and ore-forming geological characteristics，a large number of high-precision magnetic anomaly data of Qidashan mining area and its surrounding area are obtained by adopting the high-precision magnetic survey method.The magnetic survey data are processed systematically，including reduction to the pole，the analytic continuation and direction derivation so as to suppress the interference information and highlight the useful mineral-induced abnormal information of ores in different depth.Combined with the research results of geological regularity，the development and distribution of concealed structures in Qidashan mining area are identified and the spatial distribution characteristics and regularities of orebodies in this area are clarified in detail.Therefore，the research results provide theoretical basis and technical guidance for prospecting for reserves increase in deep and marginal exploration in Qidashan iron deposit，but also provide reference for exploration of deep and hidden orebodies in regional BIF-type iron ore deposits.
    Discussion on Ore-forming Material Source of Jingshansi Iron Deposit in Henan Province
    LUO Zheng-Chuan, CAO Ting-Kun, LIU Qing-Quan, WEI Ming-Jun
    2014, 43(07):  122-125. 
    Asbtract ( 1105 )   PDF  
    Related Articles | Metrics
    The geochemical characteristics of the main elements，trace elements and rare earth elements of Jingshansi iron deposit are analyzed.Through comparing with the same kind of iron deposits at domestic，the ore-forming material source of this deposit is discussed.Jingshansi iron deposit mainly consists of Fe2O3，FeO and SiO2 with rather low contents of Al2O3，TiO2，and trace elements Sc，V，Cr，which indicates that terrigenous clast materials contributed little to the ore-forming process.The w(Sr)/w(Ba) value among the mineral is from 3.37 to 52.20，all over 1，which is in accordance with that of marine-hydrothermal sediments.The value of w(SiO2)/w(Al2O3) is from 48.35 to 75.49，indicating that Jingshansi iron deposit is related to the volcanic sedimentation.After PAAS standardization，the distribution patterns of rare earth elements show up as enrichment of heavy rare earth elements，deficit of light rare elements and positive anomaly of La，Eu，Y，high value of δY/δHo from 55.96 to 75.29 and the value of δLa/δYb less than 1，which reflect that rare earth elements maybe come from the mixed solution of seawater and high temperature submarine hydrothermal solution.Therefore，it is considered that the ore-forming material source of Jingshansi iron deposit derives from the intermixture of submarine volcanic hydrothermal solution and seawater.
    Real-time Measurement Technology of Intersection Angle for Underground Intelligent Load-haul-dump
    LI Jian-Guo, ZHAN Kai, GU Hong-Shu, SHI Feng, FENG Xiao-Hua, GUO Xin
    2014, 43(07):  126-129. 
    Asbtract ( 1117 )   PDF  
    Related Articles | Metrics
    In view of the requirement for control technique of underground intelligent load-haul-dump(LHD)，a real-time measurement technology for the intersection angle between the front and rear of the LHD is proposed.The developing background and the status quo of the intelligent LHD are introduced.Combining with the requirement for actual working environment and the accuracy of intelligent control，a real-time measurement method of intersection angle information is developed，including the real-time schemes of design requirements of angle sensor，the data processing system.The software development process based on Monta-Vista Linux operating system is given.In the light of special articulated link structure of LHD front and rear，an initiative angle sensor mounting bracket is designed to solve problems in measurement errors and sensor damage caused by longitudinal force by uneven pavement.Finally，this technology is applied into the intelligent control system of 0.4 m3 LHD.The experimental data show that it is reliable，and can obtain real-time angle information on the vehicle front and rear.The accuracy and stability of angle information meet the needs of real-time control of intelligent LHD.This technology has a good application prospect.
    Key Technologies of 3D Underground Personnel Positioning System
    QIU Yin-Guo, ZHANG Zhen-Guo, WANG Xiao-Bing
    2014, 43(07):  130-134. 
    Asbtract ( 1515 )   PDF  
    Related Articles | Metrics
    Aiming at the shortages in traditional personnel positioning systems like low positioning accuracy，not clear positioning expression，and only regional positioning，a personnel positioning system in 3D coal undergrounds is proposed based on WiFi and VR technologies.The structure，working principle，system function and key technologies of this system are introduced.To improve positioning skills and three-dimensional expression performance of the system，real-time calculation of 3D coordinates of underground personnel and an improved camera occlusion detection algorithm are designed，and the prototype three-dimensional space personnel positioning system is built based on Unity3D engine and the 3ds Max modeling tool，realizing the functions of personnel information management，three-dimensional real-time positioning，path query，violations supervision，which can provide support for post-disaster relief，production scheduling，attendance management and so on.Taking a coal mine in Shanxi as a trial，error of the system is controlled within 3 m by underground experiments，and personnel real-time location and surrounding environment are visible in the camera，which verifies the feasibility of locating algorithm.The system has been applied in practice with a good effect.
    Conceptual Model of Digital Mine Information Integration
    MA Xiong, LIAN Min-Jie, LU Cai-Wu, YANG Zhen
    2014, 43(07):  135-140. 
    Asbtract ( 1243 )   PDF  
    Related Articles | Metrics
    In process of digital mine construction，information systems of mining production get large and complex，which produces such problems in mining information management as low supporting of real-time acquisition，separate and heterogeneous data formats，real-time sharing difficulties，complex mass storage and analysis difficulties.Therefore，in view of above problems，based on summarizing the status quo of the digital mine development，Nolan stage model of digital mining construction is analyzed，finding that our digital mining construction will face new challenges and more advanced demands in the information integration stage.With the help of systems engineering，database application technology，network technology，software architecture and cloud storage，a new concept of digital mining information integration mode is proposed，and the information integration model with characteristics of real-time storage，high sharing，reliable performance，and supporting intelligent data fusion among mining enterprises was established.According to the frame，integration of heterogeneous data is realized by adopting the Web Service and XML technology.
    Recycling and Cleaning of Filter Cloth Used in High Alkaline Copper Concentrate Filtering
    TAN Wei, MENG Ling-Bing, YANG Shi-Liang, WANG Yang, WANG Yue, SHAO Shuang
    2014, 43(07):  141-145. 
    Asbtract ( 1175 )   PDF  
    Related Articles | Metrics
    The separation of copper and molybdenum usually was realized by suppressing copper and floating molybdenum in high alkaline copper-molybdenum concentrate pulp. During the filtration process of high alkaline copper-molybdenum concentrate,the filter cloth would be blocked and hardened easily,which reduced the efficiency and even affected the normal production seriously. Different recycling experiments of filter cloth have been studied for solving the common problems in the filtration of copper concentrate,based on the analysis of blockage failure reason of the filter cloth. The results showed that: ①The acetic acid has the best cleaning performance among all kinds of acids,because acetic acid can react with the components embedded in the filter cloth,and even soften filter cloth and recover the fiber's elastic. ②Acetic acid+ultrasonic cleaning: The greater ultrasonic power and the lower frequency make better cleaning effect. ③Acetic acid+heating cleaning: Properly increasing temperature is helpful to improve the cleaning efficiency. ④Acetic acid + ultrasound + heating cleaning: The permeable rate of renewed filter cloth was 5.73×10-3 m/s,after cleaning of 3 d' filter cloth (with permeable rate of 3.09×10-3 m/s) for 30 min,under the conditions of acetic acid solution 10%,temperature at 60 ℃,ultrasonic frequency 20 kHz and the power 80 W/L. This result was so close to the new filter cloth,which indicated that this cleaning could achieve the recylcing of the filter cloth.
    Measurement and Numerical Simulation for Surrounding Rock Loose Circle of Deep-extended Roadway in Chengjiao Mine
    GAO Jia-Ping, ZHANG Sheng-Jun, DING Ya-Heng
    2014, 43(07):  146-150. 
    Asbtract ( 1091 )   PDF  
    Related Articles | Metrics
    Surrounding rock looseness range and its variation is one of the important parameters in the stability evaluation and support of roadway surrounding rock.How to quickly and accurately detect the loosen range and provide better service for the project has become a hot current in deep mining research.Under the background of the support of deep extending roadway surrounding rock and failure characteristics in Chengjiao mine，based on summarizing the achievement on loose circle from the predecessor，two horizontal rock loose circles in Chengjiao mine are comparatively studied by adopting both tests and numerical simulation.The measurement was taken from 5 stations at two horizontal roadways by using ground penetrating radar test，getting that there are large differences in failure characteristic of surrounding rocks at the transverse sections of 5 stations.Some rocks are relatively intact，and some are seriously loose and broken.Difference of surrounding rock looseness range in vertical line of different section of roadway were large and ranged between 1.4~2.8 m.This difference are closely related with geological conditions and mining pressure.The looseness of surrounding rock of deep soft rock roadway in Chengjiao Mine ranged obtained by the numerical simulation between 2.0~3.0 m.The numerical simulation and the geological radar research results were comprehensively analyzed to determine the range of loose circle in deep soft rock roadway in Chengjiao Mine ranged between 1.4~3.0 m.The results have important reference value for selecting the deep extended roadway support in Chengjiao Mine.
    Loose Circle Distribution Survey of Roadway Surrounding Rock of Isolation Pillar Zhang Hailei，Liu Tao，Guo Shengmao，Sun Jia，Wang Chengcai，Zhou Jianqiang
    ZHANG Hai-Lei, LIU Tao, GUO Sheng-Mao, SUN Jia, WANG Cheng-Cai, ZHOU Jian-Qiang
    2014, 43(07):  151-155. 
    Asbtract ( 1166 )   PDF  
    Related Articles | Metrics
    Numerous experiences shows that the distribution of loose circle of deep roadway has a major impact on support design.It is necessary to master the scope of the roadway surrounding loose and determine unstable region of roadway for determining roof safety thickness and support pattern of roadway under fillings，when isolated pillars are stoped in a mine in East China.By studying the loose circle theory and its influencing factors，a reasonable rational loose circle test program is put up.The velocity curves along the hole depth direction(VP-L curve) and the sectional view of the roadway loose area are obtained by field tests of isolated pillar mine roadway loose circle with RSM-SY5 acoustic instrument and analysis on the test results.According to the theory of loose circle support and the field tests，some research and analysis on isolation pillar roadway stability are carried out and one support recommendation is put forward.As a means of monitoring the internal deformation of the rock，loose circle test can fully reflect the real destruction and trend of mine roadway with the stoping process in mine workings，which provides scientific guidance to evaluate the stability of roadway and support the roadway in deformation.
    Monitor and Analysis of Surrounding Rock Stability in Deep Mining
    REN Fen-Hua, WANG Yong-Qiang, LI Zheng-Sheng
    2014, 43(07):  156-159. 
    Asbtract ( 1167 )   PDF  
    Related Articles | Metrics
    With the mining depth increasing of Sanshandao Gold Mine，increase of geo-stress，geo-temperature，water inflow and water purification pressure make the damage and deformation of surrounding rock more and more serious.A series of problems outstand，such as occurrence probability increase of roof falling，wall caving and other sudden engineering accidents，deterioration of work environment and a sharp increase of production costs.In order to timely grasp the surrounding rock stability in deep mining，three instruments of tunnel convergence measurement，two multi-point extensometers and four borehole stress meters are arranged in -555 m horizontal tunnel，to respectively monitor surface displacement，deep displacement and surrounding rock pressure of tunnel.By collecting and analyzing monitoring data，the stability of tunnel country rock is accurately evaluated in time，which provides a scientific guide for safe and efficient production of the mine.
    Research on Classification of Stope Stability based on the Taxonomy of Rock Quality Index
    REN Hai-Feng, SONG Wei-Dong, LI Jiang, WU Feng
    2014, 43(07):  160-163. 
    Asbtract ( 1190 )   PDF  
    Related Articles | Metrics
    In order to determine the stope stability of line 85 to line 88 at -616 mlevel of No.2 ore body of Dayingezhuang，its joint fissures are measured.According to the joint occurrence，and through the DIPS software，it is obtained that there are two dominant sets of joint with the structural plane of NE-SW in strike.The inclination and orientation of the two dominant joints are 41° and 316°，58° and 146° respectively.Based on site investigation，the rock mass are classified according to the value of Q.It is concluded that 7 stopes from line 85 to line 86.5 has a better stability，4 stopes from line 86.5 to line 87.5 is in general and No.7106 stope at line 88 is worse.With a reliable conclusion，the study provides the reference and the basis for the zoning of parameters optimization.
    Tests of Microwave Magnetic Roasting-magnetic Separation on Tailings and Gas Ash in Baosteel
    HAN Teng-Fei, LI Jie, LI Bao-Wei, HAN Ji-Cheng, WANG Shao-Bing-1, HAN Lei
    2014, 43(07):  164-167. 
    Asbtract ( 1055 )   PDF  
    Related Articles | Metrics
    Fe grade of tailings from dressing plant of Baosteel is 17.84%,and Fe grade of furnace gas ash from Ironworks of Baosteel is 31.90%,with carbon content of 29.18%.In order to explore the efficient way for comprehensive utilization of two kinds of industrial solid waste residues,with the active coke from gas ash as reducing agent,and hematite in of tailings and gas ash as reduction object,conditioning tests for microwave heating reduction and roasting process were made,as well as the calcined products by grinding process.Results showed that under conditions of grain size of tailings ranged from 74 to 0 μm and mass ratio with blast furnace gas ash at 100∶25,microwave magnetic roasting under 570 ℃ for 10 min,and calcined product ranged from 33 to 0 μm by grinding,iron concentrate with iron grade of 54.50% and iron recovery of 83.20% was obtained by low intensity magnetic separation (80 kA/m).Hence,these two kinds of industrial solid waste residues from Baosteel can be used as resources,which brought enormous economic and social value.
    Phosphorus Removal of Compound Flocculant PAFC With Fly Ash and Red Mud
    LIU Xi, LI Ye, ZHAO Jian-Bo
    2014, 43(07):  168-171. 
    Asbtract ( 1118 )   PDF  
    Related Articles | Metrics
    In order to determine the suitable technological conditions for phosphorus wastewater treatment by adopting composite flocculant PAFC which was prepared from fly ash and red mud by hydrochloric acid modification,tests are carried out to find out suitable pH value for phosphorus removal and PAFC dosage to treat simulated phosphorus wastewater with the concentration of 50.0 μg/mL,and the optimum hydraulic condition was investigated. The results showed that under conditions of pH value 8 and the dosage of PAFC 180 mg/L,rapid stirring for 60 s at 200 r/min,slow stirring for 15 min at 50 r/min,phosphorus removal rate reached 97.55%. The phosphorus removal mechanism analysis showed：① The PAFC has features of disorder and uneven structure,large surface area,high porosity,which are favor for adsorption of phosphorus. ② Based on the self-owned hydroxyl groups such as Fe—OH,Al—OH and H—OH,as well as hydroxy complex of aluminum hydroxide (iron) formed by hydrolysis of Al3+ and Fe3+,PAFC can adsorb phosphorus; In addition to reacting with the water dissolved orthophosphate to generate insoluble phosphate precipitation,Al3+ and Fe3+ among PAFC also can reduce or eliminate the zeta potential in colloid of wastewater by electrical neutralization,so as to eliminate electrostatic repulsion in colloid of water,and quickly keep the suspended matter stable and settle down to the bottom. PAFC shows good flocculation and phosphorus removal performance. The fly ash and red mud can be used to prepare the high-quality phosphorus removal flocculant PAFC. By this process,the industrial solid wastes can be recycled as resources,to gain the goal of treating wastes by one another.
    Effect of Temperature System on Properties and Microstructure of Roasting Ceramsites Prepared with Vanadium Tailings
    CHEN Jia, CHEN Tie-Jun, ZHANG Yi-Min
    2014, 43(07):  172-176. 
    Asbtract ( 1239 )   PDF  
    Related Articles | Metrics
    The vanadium extraction tailings form stone coal in Hubei is a high-quality raw material to produce ceramsites.In order to reveal the effect of temperature system on properties and microstructure of roasting ceramsites prepared with vanadium tailing,XRD images and SEM pictures under different roasting temperature and roasting time were used to investigate the effect of the roasting temperature and roasting time on particle strength and water absorption of the ceramsites.The results show: ① the particle strength of the ceramsites increased firstly and then decreased and its water absorption decrease along with the sintering temperature raising and the time prolonging.The reason is that appropriate increase of the sintering temperature or extending sintering time plays a positive role in forming feldspar,and low melting mass was formed by the new feldspar together with silica-alumina mineral such as quartz,which was filled in the blank between particles.Then,relatively even porosities among the ceramsites were produced to increase the particle strength and decrease the water absorption of the ceramsites.But when the roasting temperature and roasting time are much higher,the uniformity flow of the low melting mass within the ceramsites led to holes merging and structure loosing.So,the strength of ceramsites decreased.②Under conditions of the pre-roasting temperature at 400 ℃,the pre-roasting time for 30 min,the roasting temperature at 1 130 ℃and the roasting time for 10 min,the properties of the ceramsites such as water adsorption,cylinder pressure strength,grain coefficient,bulk density and grain size distribution,meet well the requirements of GB/T 17431.1-1998.
    Effects of Steel Slag Fine Powder from Panzhihua Steel on Cementitious Properties of Cement
    SHI Yan, WANG Jia, CHEN Hai-Yan, FENG Qi-Ming, HUANG Yang
    2014, 43(07):  177-180. 
    Asbtract ( 1132 )   PDF  
    Related Articles | Metrics
    In order to explore the feasibility of steel slag addition in cement to realize high efficient utilization of steel slag,the effects of different particle size and different mixing amount of steel slag were studied on the cementitious properties of cement by using steel slag from Panzhihua Steel and cement clinker from Esheng Cement Group as raw materials.The results showed that,with the same mixing amount of steel slag,both the water requirement of normal consistency and the initial and the final setting time of cement were increased with the decrease of the particle size of steel slag.In addition,the activity index and the strength of cement mortar were also increased.With the same particle size of steel slag fine powder,the strength of cement mortar was decreased with the increase of steel slag fine powder.When the mixing amount of steel slag fine powder was above 30% by weight，the strength of cement mortar was decreased significantly.When 30% of cement by weight was replaced by steel slag fine powder of D50=3.17 μm or D50=6.21 μm,the strength and soundness of the cement mortar with steel slag could reach the standard of P.S.A 32.5 cement.