Formation of Waste-rock Drainage Water on Massive Sulfide Deposits of the Urals (Russia)

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• 作者：P.A. Rybnikov ; ^{ribnikoff@yandex.ru} ; L.S. Rybnikova
• 关键词：waste-rock piles ; acidic water ; sulphide ; simulation ; heavy metals ; the Urals
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：857-860
• 全文大小：159 K
• 卷排序：17

文摘

The waste-rock stockpiles of copper pyrite mines are enriched by sulphide minerals; therefore their dissolution is the reason for the acidic waters formation. Hydrochemical processes responsible for the water quality of the formed waste-rock stockpiles are studied using several sites of the Urals as the examples. Sulphide mineralization causes the sulfate composition of water, iron, aluminum and magnesium to prevail among the cations. The comparison of mine and waste-rock drainage composition shows that waste-rock waters are more mineralized: TDC is 3-5 times higher and the aluminum, iron, copper and zinc concentrations are 4-8 times higher. The composition of rocks forming mine drainage and waste rock drainage is similar, thus it can be hypothesized that the hydrogeochemical processes of mine drainage and of the waste-rock piles waters do not have significant differences. However, the degree of rock disintegration and a temperature gradient in dumps is higher, while the rate of water interchange is lower. The set of hydrodynamic, geomechanical and temperature factors promote the formation of more acidic mineralized waters of the dump body. Computer simulation (Visual MINTEQ ver.3.0/3.1) has shown that with the rate of sulphides oxidation of 3.6·103 mol/hour, the sulphides mass in the dumps would produce acidic leach-water in several hundred years.