西部干旱区某金矿历史遗留堆浸氰化尾渣污染特征分析

The Pollution Characteristics of the Legacy Residue from Cyanide Heap Leaching of a Gold Mine in the Arid Zone of Western China

本文以西部干旱区金矿历史遗留堆浸氰化尾渣为研究对象,分别进行浸出毒性酸浸和水浸试验,研究其污染特征。酸浸检测结果表明,遗留的堆浸氰化尾渣为危险废物,但经过多年的自然分解,氰化物含量已经降低,其浸出毒性(酸性)达不到危险废物鉴别标准;水浸检测结果表明,该堆浸氰化尾渣具有典型的Ⅱ类一般工业固废特性,废渣中的污染物可通过雨水淋溶扩散,存在一定的环境风险。

With the cyanidation heap leaching residue in a gold mine in the arid zone in Western China as the object of study,acidic&water leaching toxicity tests were conducted to study the pollution characteristics.The test results indicates that while the legacy residue is hazardous,the leaching toxicity(acidity)does not reach the leaching toxicity standard for hazardous waste.The reason is that after years of natural degradation,the cyanide content has decreased.The water leaching test results show that the residue is typical of China’s Class II general industrial solid waste.