某含氰废水中重金属高效分离回收及治理试验研究

Experimental study on effective separation,recovery and treatment of heavy metals in certain cyanide-containing wastewater

某黄金冶炼企业含氰废水中(亚)铁氰络合物、铜氰络合物质量浓度分别约为1 500 mg/L、510 mg/L,原处理工艺成本高,铜氰络合物与(亚)铁氰络合物不能有效分离。试验采用亚铁盐沉淀法-酸化法-过氧化氢氧化法联合工艺对该废水进行处理,并对试验条件进行了优化。该联合工艺有效去除氰化物的同时,实现了(亚)铁氰络合物和铜氰络合物的高效分离,且有价金属铜以沉淀形式回收。处理后废水中总氰化合物质量浓度低于50 mg/L,铜离子质量浓度低于50 mg/L,达到工艺回用标准要求。

The mass concentration of (ferrous) ferric cyanide complex and copper cyanide complex is 1 500 mg/L and 510 mg/L respectively in the cyanide-containing wastewater of a gold smelting enterprise. The previous treatment process costs much and the copper cyanide complex and (ferrous) ferric cyanide complex can not be effectively separated. The experiment uses ferrous salt precipitation-acidification-hydrogen peroxide oxidation joint treatment process to treat the wastewater and the experimental conditions are optimized. Besides effective removal of cyanide,the joint process realized efficient separation of (ferrous) ferric cyanide complex and copper cyanide complex,and the valuable metal copper can be recovered in form of precipitation. The total cyanide mass concentration in the treated wastewater is below 50 mg/L,cupric ion mass concentration is below 50 mg/L,which reaches the standards of process recycling.