CR PROCESS FOR TREATING COMPLEX TIN DUSTS CONTAINING HIGH ARSENIC AND ANTIMONY

来源期刊：中国有色金属学报(英文版)1992年第4期

论文作者：Tang Motang Zhao Tiancong

文章页码：39 - 42

Key words：metallurgy of tin ; chlorination metallurgy; distillation; arsenic harm

Abstract: A new process for treating complex tin dusts containing high arsenic and antimony-CR chlorination-drydistillation process(here after, CR process) has been described. The key step of this process is the CR distilling arsenic process in which the tin dusts are leached with a medium concentration hydrochloric acid. A metal or a metallic sulfide is used as a reducing agent to reduce As(V) and Sb(V), and arsenic trichloride is simultaneously distilled from the leaching system. Then arsenic is precipitated for regenerated hydrochloric acid with the sulfide precipitation method. The prominent characteristics of the CR process are of great advantage in removing impurities such as Pb, As, Zn and Sb from the dusts in one step, recovering all valuable elements, eliminating the arsenic harm, and the consequent metallurgy of tin.