酸性条件对湖北某银矿固体废物重金属浸出特性  

Heavy metal dissolution characteristics in solid waste of silver mine in Hubei province

作　　者：梅明[1] 廖金阳[1] 

机构地区：[1]武汉工程大学化学与环境工程学院,湖北武汉430074

出　　处：《武汉工程大学学报》2014年第9期29-32,共4页Journal of Wuhan Institute of Technology

摘　　要：为了解矿业活动中的固体废物在酸性条件下重金属浸出浓度对环境的影响,采用硫酸硝酸-浸出毒性实验方法,研究了湖北某银矿3种不同的固体废物废石、尾矿、氰化残渣在不同pH条件下的重金属浸出浓度及浸出率的变化.结果表明锌、铅、镉在pH=2的条件下浸出浓度最高,采矿废石中的铜在pH=2的条件下浸出浓度最高,而浮选尾矿和氰化废渣中的铜在pH=3的条件下浸出浓度最高.铜、锌、铅、镉在pH=2的环境中浸出率较高.不同样品中,重金属的浸出浓度与重金属所对应的浸出率不一定成正比关系.矿山固体废弃物释放的重金属元素会对生态环境造成影响,需要加强监测与管理.To investigate the impact of leaching concentration of heavy metals in soild waste on environment in the acidic condition, variations of leaching concentration and leaching rate of heavy metals from barren rock, tail- ings and cyanide residue in a silver mine of Hubei were studied under different pH values by sulfuric acid nitric acid-leading toxicity experiment. The results show that the leaching concentrations of zinc, lead and cadmium are highest at pH = 2 ; the leaching concentration of copper in barren rock is the highest at pH = 2, and it is highest at pH = 3 in tailings and cyanide residue ~ leaching rates of heavy metals of copper, zinc,lead and cadmium are higher at pH= 2. Leaching concentration and leaching rate of heavy metals are not proportional in different sam ples. The release of heavy metals of mine soild wastes has a impact on the surrounding ecological environment, which needs more monitoring and management.

关 键 词：固体废物 重金属 浸出 

分 类 号：X753[环境科学与工程—环境工程]