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Leaching of heavy metals in acid mine drainage

机译：酸性矿山排水中重金属的浸出

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Acid mine drainage is one of the most serious environmental problems that the coal and metal mining industry is currently facing. The generation of low pH drainage enhances the dissolution of heavy metals in water. The samples used in this research originated from three pits at mine dumps. In a study reported in this paper, three types of tests; namely static test, kinetic test and column test were conducted to estimate acid generation and acid neutralization reaction rates, and to predict the solubility of metals and their release rates. Static test showed that all samples had a pH of net acid generation (NAG pH) < 4, a net acid producing potential (NAPP) > 10 kg H_2SO_4tonne~(-1), and a S-content > 3 percent, which can be classified as a high acid-forming capacity. Simulated runoff in the column* tests was equivalent to 5-year average rainfall in Indonesia, the resultant leachates showed acidic behaviour (pH < 3.5). Based on the results, it was found that high mobilization of heavy metals (Cr, Cu, Zn, Cd and Pb) takes place under strong acidic conditions (pH approx = 2).
机译：酸性矿山排水是煤炭和金属采矿业当前面临的最严重的环境问题之一。低pH排水的产生增强了重金属在水中的溶解。本研究中使用的样本来自矿场的三个矿坑。在本文报道的一项研究中，测试分为三种类型：进行了静态试验，动力学试验和柱试验，以估计酸的产生和酸中和反应的速率，并预测金属的溶解度及其释放速率。静态测试表明，所有样品的净酸生成pH（NAG pH）<4，净酸生成电位（NAPP）> 10 kg H_2SO_4tonne〜（-1），S含量> 3％，可以被归类为高酸形成能力。柱*试验中模拟的径流相当于印度尼西亚的5年平均降雨，所得渗滤液显示出酸性行为（pH <3.5）。根据结果​​，发现在强酸性条件下（pH约= 2），重金属（Cr，Cu，Zn，Cd和Pb）的高迁移率。

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