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环境化学  2015 

黄铁矿氧化酸化及含铊重金属的迁移释放

Keywords: 黄铁矿氧化酸化,,重金属释放

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Abstract:

矿山酸性排水(ARD)导致严重的重金属污染.本文用动态浸滤试验方法研究了黄铁矿氧化产酸的特征及重金属和金属铊在黄铁矿氧化产酸过程中向环境迁移释放的特征.研究表明(1)受碳酸盐控制,前16周浸滤液呈中性;20周后受硫化物的氧化反应控制,浸滤液pH<4,开始酸性排放.(2)硫化物的氧化速率是非线性变化的,并随pH值下降而加快.(3)黄铁矿酸化过程中金属表现出不同的迁移释放特征铊向环境的迁移随pH值下降而增强,而镉、铅、锌、铜等重金属呈现峰值,pH<3时,Fe3+参与金属硫化物的氧化反应,进一步促使镉、铅、锌、铜等重金属的释放.

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