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Simulation experiments on weathering and oxidation of sulfide minerals in mine tailings

CHEN Tian_hu 1, FENG Jun_hui 1, XU Xiao_chun 1, CHEN Xing_hai and CUI Long_peng 2 (1. Department of Natural Resources and Environment, Hefei University of Technology, Hefei 230009,China; 2. Department of Natural Resources and Environment, Anhui Uni  
The weathering and oxidation of sulfides within mine tailings lead to acid drainage and release of heavy metals, which pollute ground water and surface water and damage ecological environment. Recent researches show that many factors can affect weathering of mine tailings. This paper points out that grain sizes, pH values and concentrations of organic matters in mine tailings can affect weathering and oxidation of sulfides. The qualitative observation and quantitative test of sulfides with optic microscope indicate that the rate of oxidation follows the sequence of PbSZnSFe 1-x SCuFeS 2FeS 2 within sulfides of the same grain size. The experimental results also suggest that organic matters in mine tailings can prevent sulfide minerals from weathering and oxidation.
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