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金属矿山 ›› 2020, Vol. 49 ›› Issue (11): 79-83.

• 矿物工程 • 上一篇    下一篇

鞍千磁铁矿石选矿短流程优化试验

徐冬林,王长艳,侯鹏程,盖壮,韦文杰,张玲   

  1. 1. 鞍钢集团鞍千矿业责任有限公司,辽宁 鞍山 114043;2. 东北大学资源与土木工程学院,辽宁 沈阳 110819;3. 难采选铁矿资源高效开发利用技术国家地方联合工程研究中心,辽宁 沈阳 110819
  • 出版日期:2020-11-15 发布日期:2020-12-22

Mineral Processing Optimization Test of Magnetite Ores in Anqian with Short Process

XU Donglin,WANG Changyan,HOU Pengcheng,GAI Zhuang,WEI Wenjie,ZHANG Ling   

  1. 1. Anqian Mining Co.,Ltd., Anshan Iron and Steel Group, Anshan 114043, China; 2. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China; 3. National-Local Joint Engineering Research Center of Refractory Iron Ore Resources Efficient Utilization Technology, Shenyang 110819, China
  • Online:2020-11-15 Published:2020-12-22

摘要: 鞍千磁铁矿石铁品位为29.25%,铁主要以磁铁矿的形式存在,磁铁矿中铁的分布率为79.02%,主要脉石矿物为石英。为高效开发利用该低品位铁矿石,强化磁选分选效率,进行短流程工艺优化试验。采用 了化学多元素分析、铁物相检测和XRD分析等手段对矿石性质进行分析,并在此基础上进行了新型流程设计,针对-1 mm、-2 mm、-3 mm、-4 mm 4种粒级高压辊磨破碎产物进行了一段弱磁预选试验、弱磁预选精矿再磨 再选试验和弱磁预选尾矿强磁再选探索试验。结果表明:①物料破碎粒度越细,弱磁预选精矿品位和回收率越高,由于高压辊磨设备处理细粒级物料效果较差,确定-3 mm为最佳破碎粒度,此时精矿铁品位为38.03%、 铁回收率为88.12%;②预选精矿再磨试验中,增加再磨细度,弱磁精选精矿的铁品位不断上升,铁作业回收率则不断下降,最佳磨矿细度为-0.038 mm占94.30%,此时铁的总回收率为81.99%;③强磁探索试验中,随着 磁场强度的增加,4个粒级的强磁精矿铁品位逐渐下降,铁作业回收率逐渐提高后趋于平稳,尾矿抛尾产率逐渐减少;④选取-3 mm弱磁尾矿,在背景磁感应强度为1.0 T、给矿速度1.3 kg/min、给矿水流量6.5 L/min 、转环转速2.0 r/min、脉动200 次/min的条件下,最终可获得铁品位为16.54%、铁作业回收率为80.93%的强磁精矿,其回收价值不高,故舍弃强磁流程。最终确定了“高压辊碎磨—弱磁预选—细磨—弱磁精选”工艺 流程替代原有的“阶段磨矿、粗细分选、重选—强磁选—阴离子反浮选”复杂长流程。试验完成了对鞍千矿业公司原有流程的优化,对鞍千矿业及鞍山地区磁铁矿选矿工艺指标改善具有参考意义。

关键词: 磁铁矿石, 短流程优化, 粒级, 弱磁预选, 精矿再磨, 强磁选

Abstract: The grade of iron in Anqian magnetite is 29.25%, and the iron mainly exists in the form of magnetite with the distribution rate of iron in magnetite of 79.02%. The main gangue mineral is quartz. In order to develop and utilize the low-grade iron ore efficiently and enhance the magnetic separation efficiency, the short process optimization test was carried out. Analysis methods, such as chemical multi-elements analysis, iron phase test and XRD analysis were adpoted to study the ore properties for basis of the new process design. One-stage low- magnetic preconcentration, regrinding and reselection of concentrate from low-magnetic preconcentration and high-magnetic reselection of tailings from low-magnetic preconcentration were carried out with faction of -1 mm, -2 mm, -3 mm and -4 mm prepared from high pressure roller mill. The results showed that: ①The finer the particle size of the material is, the higher the grade and recovery rate of the concentrate of the low-magnetic preseparation is. Since the high pressure roller grinding equipment has poor effect on the fine particle size, -3 mm is determined as the best crushing size. At this time, the iron grade of the concentrate is 38.03%, and the iron recovery rate is 88.12%. ②The iron grade of low-magnetic separation increased and the iron operation recovery rate decreased with the increase of regrinding fineness in the regrinding test of preconcentration concentrate. The optimal grinding fineness is - 0.038 mm accounting for 94.30%, in which the total recovery rate of iron is 81.99%. ③The iron grade of the four particle sizes of the high-magnetic concentrate gradually decreased with the increase of magnetic field intensity in the high-magnetic exploration test. The iron recovery rate gradually increased and then became stable, while the tailings yield gradually decreased. ④The high-magnetic separation tests were carried out with low-intensity magnetic tailings of -3 mm under the conditions of the background magnetic induction intensity of 1.0 T, the feeding speed of 1.3 kg /min, the feeding water flow rate of 6.5 L/min, the rotating speed of 2.0 r/min and the fluctuation of 200 times/min. The high-magnetic concentrate with the iron grade of 16.54% and the iron recovery rate of 80.93% could be obtained finally. The recovery value was not high, thus the high-magnetic process was abandoned. Finally, the technological process of "high pressure roller crushing, weak magnetic pre concentration, fine grinding and weak magnetic separation" was determined to replace the original complex long process of "stage grinding, coarse and fine separation, gravity separation, strong magnetic and anion reverse flotation". The experiment has completed the optimization of the original process of Anqian Mining Company, which is of reference significance to the improvement of magnetite beneficiation process indexes in Anshan area and Anqian Mining Company.

Key words: magnetite, optimization of short process, fraction, low-intensity magnetic preselection, regrinding of concentrate, high-intensity magnetic separation