尾矿中黄铁矿的赋存形式及环境影响

摘要

根据栗西尾矿堆积坝工程地质勘察和大量的试验数据,分析了黄铁矿在尾矿库地下水和尾矿中的赋存形式及其变化规律.研究表明:黄铁矿是尾矿中酸和重金属释放的主要贡献者,黄铁矿中的Fe以不同的形式存在于放矿水、库水、尾矿坝沉积滩面、地下水和尾矿中,在其氧化物中,Mn、Mo明显富集；黄铁矿风化产物对尾矿坝排渗设施化学淤堵和离子迁移有特殊作用,是影响尾矿坝稳定性和环境的重要因素之一.%According to the geological investigation and a large number of experimental data of Lixi Tailings Dam,the occurrence and variation of pyrite in the groundwater and tailings in tailing pond were analyzed.The results show that pyrite is a major contributor to the release of acid and heavy metals in the tailings,Fe in the pyrite exists in different forms in the tailings pond water,deposited beach,groundwater and tailings.As in its oxide,Mn,Mo is significantly enriched ; The weathering products of pyrite play important part in tailings dam row infiltration facilities and ion mobility.It is one of the important factors which affect the stability of the tailings dam and the environment.