Sustainable Mining and Metallurgy

This paper focused on the process of zinc dross treatment with offgas washing supporting rotary kiln, analyzed the chlorine content of calcine produced by small kiln under different temperatures and kiln speeds, and obtained the optimal reaction conditions of kiln tail temperature of 400℃±10℃, kiln speed of 13Hz, reaction time of 3h, and kiln head charge level temperature of about 850℃, so that the chlorine content of calcine in small kiln is less than 0.08%, and the dechlorination efficiency of zinc dross reaches 97%. The pressure drop, temperature difference, chlorine distribution and balance were analyzed, and key points of process control were proposed.