Research on Depth Dechlorination by Copper Slag Valence Regulation of Synergistic High-Activity Copper in the Ultrasonic Field

Due to the problems of cuprous chloride resolution and low copper activity in traditional copper slag dechlorination process, depth dechlorination by copper slag valence regulation of synergistic high-activity copper in the ultrasonic field was proposed. According to a series of conditional experiments, the optimal dechlorination parameters under ultrasonic conditions are as follows: the molar ratio of Cu:Zn:Cl is 3:2:1, the chlorine concentration can be reduced from 440 to 15 mg/L at 30 minutes, 50 °C and 30 g/L acidity, and the dechlorination efficiency is 96.6 pct. Compared with conventional and ultrasonic dechlorination, ultrasonic dechlorination can reduce the amount of copper slag by 56.67 pct and zinc powder by 68.1 pct to achieve low consumption and high-efficiency dechlorination. Ultrasonic dechlorination, because of its cavitation, the mechanical effect can accelerate and deepen the reaction process and can achieve a high standard of deep chlorine removal purpose, has a broad prospect in the industrial field. Graphical abstract