Abstract:Large quantities of refractory acidic wastewater containing high concentrations of Cu2+ and Cl- is produced during the copper smelting process. It is necessary to efficiently remove the contaminants before this type of wastewaterbeing recycled. This study proposes the simultaneous removal of Cu2+ and Cl- from wastewater by precipitation reactions under the action of thiourea and ascorbic acid. The results show that 88.5% of Cu2+ and 83.6% of Cl- can be removed after 20 min of reaction at room temperaturewith a TU∶AC∶Cu2+ mole ratio of 1∶1∶1. At the optimum reaction temperature of50℃, this method canefficientlyremove Cu2+ and Cl-from copper smelting acidic wastewater with H2SO4 concentration of 50—160g/L.With preliminary identification and characterization,the precipitates produced in the reaction are identified to be composed of [CuxTUy]Clz?nH2O and [CuxTUy]SO4z/2?nH2O.