矿山废弃物产酸潜力评价

A. Bruynesteyn, R. Hackl
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引用次数: 41

摘要

讨论了矿山废料酸性废水的形成过程,并对其中的化学成分进行了说明。氧化亚铁硫杆菌在产酸中起着重要的作用,因为它能够迅速氧化铁和硫的还原形式,从而产生H2SO4。硫化物矿物黄铁矿(FeS2)通常存在于废物中,通常被认为是酸性矿井水的主要来源。已经开发了一种小型试验程序,可以快速评估废物产生酸性流出物的能力。如果该材料被评估为潜在的酸生产者,则可以使用放大测试程序来模拟商业规模的废物倾倒所产生的废水的特性。在少雨期间,废物倾倒场的潮湿区域可能发生局部生物活动,导致可溶性污染物可能积聚。这些干旱期的长度极大地影响了随后降雨期间流出物的特性。
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Evaluation of acid production potential of mining waste materials
The formation of acidic effluents from mining waste materials is discussed and the chemisry involved explained. The bacteriumThiobacillus ferrooxidans plays an important role in acid production due to its ability to rapidly oxidize reduced forms of iron and sulphur which can result in the generation of H2SO4. The sulphide mineral pyrite (FeS2), often present in waste materials, is generally recognized as the chief source of acid mine drainage.A small-scale test procedure has been developed which rapidly evaluates a waste material's capability to produce an acidic effluent. If the material is assessed as a potential acid producer, then scale-up testing procedures are available which can be used to simulate the characteristics of the effluents produced from a commercial-size waste dump.During periods of little rainfall, localized biological activity may occur in wet areas of a waste dump, resulting in possible accumulation of soluble pollutants. The length of these dry periods greatly affects effluent characteristics during subsequent rainfalls.
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