低镉铜硫酸锌溶液超声波强化锌粉置换除镉铜研究OACHSSCD

In the process of removing cadmium(Cd)and copper(Cu)from zinc sulfate solution,the passivation and encapsulation of zinc powder lead to the low utilization rate of zinc powder.In order to solve this problem,an ultrasonic-enhanced industrial atomization zinc powder was proposed to remove Cd and Cu from the three-stage purification solution of zinc sulfate.The effects of zinc powder dosage,reaction time and ultrasonic power on the concentration of Cd and Cu in the solution under conventional conditions and ultrasonic enhanced conditions were investigated respectively.The optimum parameters of conventional purification process were determined as follows:reaction temperature 65℃,zinc powder dosage 0.6 g/L,reaction time 90 min.The mass concentration of Cd and Cu in zinc sulfate solution decreased from 46.51 mg/L and 9.34 mg/L to 0.148 mg/L and 0.104 mg/L,respectively.The optimum parameters of the ultrasonic purification process are as follows:reaction temperature 50℃zinc powder dosage 0.5 g/L,reaction time 60 min,ultrasonic power 30 W,the mass concentration of Cd and Cu is reduced to 0.510 mg/L and 0.022 mg/L.The concentration of Cd and Cu after purification by the two processes meets the requirements of zinc electrowinning for impurity concentration.Compared with the conventional process,the ultrasonic purification process reduces the reaction temperature,shortens the reaction time,and saves 16.67%of zinc powder.