Abstract:Aiming at the high chlorine wastewater containing 20 g/L to 40 g/L chlorine produced in the production process of copper smelting enterprises，a two-stage dechlorination process of cuprous oxide was adopted，the effects of cuprous oxide dosage，reaction temperature，reaction time，stirring speed and secondary cuprous oxide dosage on the dechlorination of high chloride wastewater were investigated. The results showed that the dosage of cuprous oxide was n(Cu)/n(Cl)=1.3, the stirring speed was 60 r/min, the reaction was carried out at 70 ℃ for 2.0 h, and the dosage of second-stage cuprous oxide was n(Cu)/n(Cl)=1.2, the dechlorination rate of the primary high-chlorination wastewater was 92.31%, and the dechlorination rate of the secondary high-chlorination wastewater was 88.91%. The final wastewater contained less than 250 mg/L of chlorine, and the dechlorination effect was better.