煤矸石在动态淋溶条件下重金属的溶出特性

Charactertics of Heavy Metal Element Dissolution of Coal Gangue under Dynamic Leaching Condition

以山西某矿区的煤矸石为研究对象,结合山西地区(当地)降雨特征,采用动态淋溶实验模拟大气降水对煤矸石中微量重金属元素溶出特性进行研究,配制pH=5.5~5.7的淋溶液,研究降水过程中煤矸石中重金属的溶出规律。结果显示,煤矸石中重金属元素的溶出浓度和释放率不仅与该元素在煤矸石中的含量有关,还与该元素在煤矸石中的赋存状态有关。

The coal gangue of a coal mine in Shanxi province was selected as case study,moreover,the characteristics of rainfall in the local area was also introduced.By using dynamic leaching test to simulate the atmospheric precipitation,the dissolution of trace metal element in coal gangue was studied.The leachate of which pH=5.5to 5.7was compounded to test the dissolution of trace metal element.The results showed that the dissolution and release rate of trace metal element were related to both the content and the occurrence of this trace metal element in coal gangue.