铜氨溶液在使用过程中常伴有铜氨废水产生，如果不加以处理将会严重污染环境。以氧化还原电位（ORP）控制硫化沉淀和利用沉淀浮选对铜渣进行回收的组合工艺对铜氨废水进行实验研究。结果表明，在pH为11时，ORP与硫化钠加药量、水中残余铜浓度具有高度相关性，利用ORP最大突变点和ORP<-500 mV皆可控制硫化钠加药量，残余总铜质量浓度<0.5 mg/L；对沉淀物进行浮选，在pH为5~11、异戊基黄药质量浓度为100 mg/L或丁铵黑药质量浓度为160 mg/L、浮选时间为5 min时，均可实现99%以上的铜回收率。回收产品可作为铜精矿销售，实现铜氨废水的资源化利用。

Experimental study is performed upon copper-ammonia wastewater by using a combined technology that ORP (redox potential) is used to control the sulfide precipitation and precipitation flotation is utilized to recover copper slag.Experimental results show that ORP has a high correlation with the addition amount of sodium sulfide and the residual copper content in water when pH equals to 11.Both the maximum reversal point of ORP and a value of ORP less than -500 mV can be utilized to control the dosage of sodium sulfide,and the residual total copper concentration is less than 0.5 mg·L^-1.As the precipitate is floated,the recovery rate of copper can achieve 99% when pH=5-11,the concentration of isoamyl yellow is 100 mg·L^-1 or that of butyl ammonium black medicine is 160 mg·L^-1,and flotation time is 5 min.The recovered products can be sold as copper concentrate to realize the reutilization of copper ammonia wastewater.