某金矿氰渣除氰固砷实验研究

Experimental Study on Removing Cyanide and Fixing Arsenic from Cyanide Residue of a Gold Mine

某金矿氰渣中总氰化物和总砷元素超标,研究了采用过氧化氢氧化分解氰化物、硫酸亚铁络合固砷工艺对氰渣进行无害化处理。结果表明:除氰段,过氧化氢加入量2 mL/L,反应时间2 h;固砷段,硫酸亚铁加入量0.5 g/L,过氧化氢加入量1 mL/L,硫酸加入量6.5 mL/L,反应时间1 h;经过除氰和固砷处理,所得氰渣的毒性浸出液中总氰化物质量浓度为0.25 mg/L,砷质量浓度为0.55 mg/L,满足标准要求,可进入尾矿库堆存。

The total cyanide and arsenic in a cyanide residue of a gold mine exceed the standard requirements.The process of hydrogen peroxide oxidation decomposition cyanide and ferrous sulfate complexation fixation arsenic is studied.The results showed that in the cyanogen removal section,the amount of hydrogen peroxide added was 2 ml/L,the reaction time was 2 h,in the arsenic fixation section,the amount of ferrous sulfate added was 0.5 g/L,the amount of hydrogen peroxide added was 1 ml/L,the amount of sulfuric acid added was 6.5 ml/L,and the reaction time was 1 h.After the treatment of cyanide removal and arsenic fixation,the total cyanide concentration and arsenic concentration in the toxic leaching solution of the cyanogen residue are 0.25 mg/L and 0.55 mg/L,which meets the standard requirements and can be stored in the tailings pond.