不同粒径煤矸石矿井填充环境影响的淋溶实验

煤矸石中含有多种有害微量元素,因此用煤矸石填充矿井可能对地下水造成二次污染.为评估填充的安全性,作者以平顶山矿区为例,将煤矸石处理成4种不同的粒径,进行连续淋溶实验,模拟其在矿井填充后对地下水环境的影响,并测定pH值、电导率、F-、总硬度、Zn2+、Mn2+、Cd2+、Cr6+、Cu2+、Pb2+等项目.在实验条件下,淋溶液中的F-和Mn2+超标,Pb2+偶有超标;pH偏碱性,且粒径越小,越利于组分溶出;其他组分溶出量小,多未检出.实验表明,填充是可行的,但对地下水环境存在一定影响,必须对其进行处理,控制F-、Mn2+和Pb2+的溶出.

Leaching Experiments with Gangue of different diameters simulating the environmental influence after filling-in coal mine

Many kinds of trace elements are contained in gangue and they may contaminate groundwater after filling-in underground.To evaluate its safety,the paper simulated influence on groundwater after filling-in underground with gangue treated into 4 different diameters through the continuous simulative sprinkling experiments in Pingdingshan coal mine.Index tested in the experiments are pH,conductivity,F~-,total hardness,Zn~(2 ),Mn~(2 ),Cd~(2 ),Cr~(6 ),Cu~(2 ) and Pb~(2 ).In the eluviation water under experiment condition,the value of F~-and Mn~(2 ) exceeded the standards,Pb~(2 ) can be detected occasionally,pH is on the high side of the standard,and may pollute underground water.It also shows that the smaller the particles are,the easier the eluviation is.While the contents of other heavy metals are very few and even cann't be detected.It can be concluded that the filling-in is possible,only after the gangue is treated and the stripping of F~-,Mn~(2 ) and Pb~(2 ) are inhibited effectively for its pollution still exist without control.