Study On Aquatic Environmental Influence Of Mining Solid Waste Meterial In The Metal Sulfide Deposit Area--Example For The Mining Area In Jin-dui-cheng, Shan-xi

Aquatic environmental pollution problems caused by the mining solid waste meterial pile sites in the metal sulfide deposit area have attracted attention recent years. At present, the researches at home and abroad concentrate on aquatic environmental influence of mine tailing and coal-gangue, but seldom focus on waste rock, which contrasts sharply with the present status of a large amount of waste rock pile in my country. So the study on aquatic environmental influence of the mining waste rock has actual significance.The paper introduced sulfide surface reaction simply, discussed the mechanism of production of acidic water including SO42-, heavy metal ions, high hardness, summarized the influencing factors of acidic water and heavy metal pollution. The study collected water samples from Xi-chuan River entry point and export point of Jin-dui-cheng Mo mining area in Hua-xian, Shan-xi, tested macroconstituent and microcomponent, analysed characteristic, ascertained index of pollution. In order to know about kinetic course and reveal the mechanism of change, mineral elements were soaked using river water. Migration and conversion of component with time passing was discussed through leaching and leaching-circulation experiments. At the same time, factors of controlling pollution component were generalized through soak experiments.The datas show: aquatic pollution of the mining waste rock includes not only acidic water, but also SO42-and hardness increasing largely and content of minor metals such as Cu, Pb, Zn, Fe increasing in some extent; Weathering minerals couldn't generate acidic water and heavy metal pollution in short-time leaching, but latent pollution will occure through long-term reaction; With moving-distance and touching-time increasing of leaching water in column, pH value changes largely and cumulative ions amount increases; the less minerals grain-size is, the higher weathering degree is, ions solve easier and it would produces pollution of acid, hardness, sulfate; metal ions solve a little and it has not make pollution in experiment circumstance; In contrast with Fe, Cu, Pb, Znchanges regularly; Higher temperature is beneficial to solution of inorganic salt and heavy metal ions.People can concern with aquatic environmental pollution of waste rock omnibearingly through the study. At the same time, it has theory significance in controlling influence of aquatic environment of the waste rock and has use value in controlling pollution.