粒度对石煤钒矿废石重金属静态淋溶的影响规律

发布时间：2018-03-20 06:29

本文选题：石煤钒矿　切入点：废石　出处：《稀有金属》2017年06期 　论文类型：期刊论文

【摘要】：石煤钒矿开采过程中的大量废石,由于露天堆放而导致周边环境产生重金属污染。以湖北某地石煤钒矿废石为研究对象,通过进行实验室静态淋溶试验发现,淋出液中V,Pb,Cd,Cr,As溶出量随粒度的增加而降低,最高溶出量分别为7695.00,1266.00,19.10,777.70,163.10μg·kg~(-1),重金属溶出率分别达到0.23%,11.71%,0.18%,0.12%,1.00%。研究发现,淋出液p H值对重金属溶出量影响较大,高p H值会使重金属沉淀吸附于废石表面,从而降低淋出液中重金属浓度,对环境污染程度较低。石煤钒矿废石的淋溶过程按淋出液p H变化规律可分为4个阶段,分析各阶段主要反应为:碱性矿物溶解和H+与基本阳离子交换作用、硫铁矿等还原性矿物氧化产酸作用、硅酸盐矿物的风化作用和金属元素的吸附沉淀作用。
[Abstract]:A large amount of waste rock in the mining process of stone coal vanadium mine resulted in heavy metal pollution in the surrounding environment due to open-pit stacking. Taking the waste stone of stone coal vanadium mine in Hubei province as the research object, it was found by the laboratory static leaching test that the heavy metal pollution occurred in the surrounding environment. The dissolving amount of VPbPbCCDCrOAs in leaching solution decreased with the increase of particle size, and the highest dissolution amount was 7695.00 ~ 1266.00 ~ 19.10777.707.70 ~ 163.10 渭 g 路kg ~ (-1) 渭 g 路kg ~ (-1) 路kg ~ (-1). The dissolution rate of heavy metal reached 0.23 ~ 11.71g 路kg ~ (-1) ~ (-1). It was found that the pH value of leaching solution had a great effect on the dissolution of heavy metals. High pH value will cause heavy metal precipitation to adsorb on the surface of waste rock, thus reducing the concentration of heavy metal in leaching solution, and the degree of environmental pollution is relatively low. The leaching process of waste stone from vanadium mine of stone coal can be divided into four stages according to the law of leaching solution pH. The main reactions in each stage are dissolution of alkaline minerals and exchange of H with basic cations, oxidation of pyrite and other reductive minerals to produce acid, weathering of silicate minerals and adsorption and precipitation of metal elements.
【作者单位】：北京科技大学能源与环境工程学院;工业典型污染物资源化处理北京市重点实验室;
【基金】：国家科技部水体污染控制与治理科技重大专项项目(2015ZX07205003)资助
【分类号】：X753

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