| 摘要 |
Mine tailings responsible for widespread water and soil degradation are an environmental problem due to the presence of metal sulfides, primarily pyrite, and elevated heavy metal and concentrations, and are often incapable of supporting plants because of salt toxicities, poor texture, and nutrient deficiencies. Upon exposure to the atmosphere, residual pyrite in tailings oxidizes and generates acid. Once acid is generated, heavy metals present in the tailings are mobilized and released into the environment. Cleaning or reprocessing tailings is used to remove residual pyrite and heavy metals. Successful mineral separation resulted in a small amount of metal sulfide concentrate and a large volume of reprocessed tailings that had a low metal sulfide content. Total metal concentrations were reduced in the cleaned material and elevated in the metal sulfide concentrate when compared to the original, uncleaned tailings.
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