工业硫化砷渣的性质研究与环境风险分析

Property research of industrial arsenic sulphide residue and environmental risk analysis

采用湖北某冶炼厂工业硫化砷渣作为试样,对其腐蚀性、酸度、粒径分布、基本元素组成、表面形态、沉降性能、重金属浸出毒性和元素形态及分布等物理化学性质进行了研究。研究表明,该硫化砷渣中的Cu主要以可氧化态和残余态形式存在,Pb主要以可氧化态形式存在,Zn、Cd主要以酸可提取态和残余态的形式存在。其浸出酸度达到62.55 mg/g,具有很强的腐蚀性。在酸雨条件下,工业硫化砷渣中的重金属形态可以发生转化,易对环境造成二次危害。但是,该废渣中w(As)接近30%,可作为砷原料再利用。

The physical and chemical properties of arsenic sulphide residue from a metallurgical plant in Hubei province were studied in terms of its corrosivity,acidity,particle size distribution,essential element composition,surface morphology,settling performance,leaching toxicity of heavy metals and element speciation and distribution.The results implied that Cu was present mainly in oxidizable and residual forms,Pb in oxidizable forms,Zn and Cd in acid extractable and residual forms.The acidity of leached liquid was up to 62.55 mg/g,exhibiting strong corrosivity.The heavy metal forms can be transformed,especially when acid rain occurs,which will cause a secondary harm to environment.The arsenic sulphide residue can be used as arsenic raw material considering its arsenic concentration of nearly 30%.