矿渣-钢渣基胶凝材料固化某含砷尾砂试验

金属矿山 ›› 2018, Vol. 47 ›› Issue (11): 189-192.

矿渣-钢渣基胶凝材料固化某含砷尾砂试验

鄢琪慧^1,2,3，倪文^1,2,3，高巍^1,2,3，李云云^1,2,3，张钰莹^1,2,3

1. 北京科技大学土木与资源工程学院，北京 100083；2. 金属矿山高效开采与安全教育部重点实验室，北京 100083；3. 工业典型污染物资源化处理北京市重点实验室，北京 100083

出版日期:2018-11-15 发布日期:2018-12-19

Test of Solidification of Arsenic-containing Tailings Using Blast Furnace Slag-Steel Slag Based Cementitious Material

Yan Qihui^1,2,3，Ni Wen^1,2,3，Gao Wei^1,2,3，Li Yunyun^1,2,3，Zhang Yuying^1,2,3

1. School of Civil and Resources Engineering， University of Science and Technology Beijing， Beijing 100083， China；2. Key Laboratory of High-efficient Mining and Safety of Metal Mines， Ministry of Education， Beijing 100083， China；3. Key Laboratory of Resource-oriented Treatment of Industrial Pollutants， Beijing 100083， China

Online:2018-11-15 Published:2018-12-19

摘要/Abstract

摘要： 为了解矿渣-钢渣基胶凝材料（MSC胶凝材料）固化含砷尾矿的可能性，以含砷0.11%、砷浸出浓度为0.66 mg/L的广西某选矿厂铅锌矿尾矿为研究对象，进行了制备膏体充填料试验，探讨了胶凝材料配方对膏体充填料流动度、固化体抗压强度和砷浸出浓度及浸出液pH的影响。结果表明：在试验矿渣、钢渣、脱硫石膏和Ca（OH）₂掺量分别为51%、25.5%、8.5%、15%，胶砂比为1∶4，减水剂掺量为1%，料浆浓度为86%情况下，充填料浆流动度为300 mm，满足膏体充填自流输送的要求；固化体在40 ℃下养护28 d的抗压强度为20.19 MPa，满足胶结充填采矿对充填体抗压强度的要求，且砷浸出浓度低于检测限（0.004 mg/L）。Ca（OH）2强化了矿渣-钢渣基胶凝材料对砷的固化，主要体现在Ca（OH）2可与砷离子反应生成溶解度较低的Ca-As-O盐，并被胶凝材料水化产物C—S（A）—H凝胶等包裹，以及Ca（OH）2使得浸出液的pH值和Ca²⁺浓度较高，Ca²⁺与AsO₄^3-、AsO₃^3-生成Ca-As难溶沉淀从而降低砷的浸出浓度。

关键词: 矿渣, 钢渣, 固化, 砷, 胶结充填

Abstract: In order to confirm the possibility of solidification of arsenic-containing tailings by blast furnace slag-steel slag based cementitious materials （metallurgical slag cementitious material， abbreviation is MSC）， taking the lead-zinc mine tailings of a concentrator in Guangxi that contain 0.11% arsenic and the leaching concentrations of arsenic is 0.66 mg/L as the research object to prepare paste filling materials. The effects of the formulation of the cementitious material on the fluidity of the paste filling materials， the compressive strength of the solidified body， the leaching concentrations of arsenic and the pH of the leachate were investigated. Experimental results show that， if the mixed ratio of the backfilling materials of cementing agent to tailings is 1∶4， and subsequently the backfilling materials has a solid content of 86% in weight， and the dosage ratio of blast furnace slag， steel slag， desulfurization gypsum， and calcium hydroxide is 51%， 25.5%， 8.5%， and 15%， the fluidity of the filling slurry is 300 mm， and meet the requirements of paste filling and self-flow conveying. The average compressive strength of the solidified body is 20.19 MPa after 28 days curing at 40 ℃， and meet the requirements of cemented backfilling for compressive strength of filling body. The leaching concentrations of arsenic is lower than testing limit that is 0.004 mg/L. The addition of calcium hydroxide makes MSC more effective to immobilize arsenic. It is mainly reflected in the reaction of calcium hydroxide with arsenic ions to form Ca-As-O salt with low solubility， and is encapsulated by cementitious material hydration product C-S（A）-H gel. Furthermore， the addition of calcium hydroxide increases the pH of the leachate and the concentrations of Ca₂₊ in the leachate， and Ca₂₊ react with AsO₄^3-， AsO₃^3-， in formation of Ca-As insoluble precipitates to reduce the arsenic leaching concentrations.

Key words: Blast furnace slag, Steel slag, Solidification, Arsenic, Cemented backfilling

鄢琪慧, 倪文, 高巍, 李云云, 张钰莹. 矿渣-钢渣基胶凝材料固化某含砷尾砂试验[J]. 金属矿山, 2018, 47(11): 189-192.

YAN Qi-Hui, NI Wen, GAO Wei, LI Yun-Yun, ZHANG Yu-Ying. Test of Solidification of Arsenic-containing Tailings Using Blast Furnace Slag-Steel Slag Based Cementitious Material[J]. Metal Mine, 2018, 47(11): 189-192.

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