Preparation of high-purity antimony oxychloride from high-arsenic refined bismuth dust

Preparation of high-purity antimony oxychloride from high-arsenic refined bismuth dust in a process of hydrochloric acid leaching,antimony powder reduction,hydrolysis,hydrochloric acid dissolution,impurity removal,hydrolysis was studied.In the process of leaching with hydrochloric acid,the leaching rates of Sb,As,Bi and Pb are 99.50%,92.79%,95.12% and 85.34% when the ratio of hydrochloric acid solutions to refined bismuth dust is 3:1,reaction time is 4 h,reaction temperature is 80 ℃,the content of hydrochloric acid is 1.2 times of its theoretical content.Sb5+ is reduced to Sb3+ by adding antimony powder into the hydrochloric acid leaching solution,which is then hydrolyzed.The hydrolysis rate of Sb3+ arrives at 98.25% when the reaction temperature is 20 ℃,reaction time is 1 h,and the ratio of water to SbCl3 solution is 10:1.After the hydrolysate is dissolved by hydrochloric acid solutions and the impurity is removed after 1 h by means of adding agent,the solution is hydrolyzed and the products is obtained by means of filtration,washing and drying.The content of Sb in the products arrives at 75.71% and the impurity contents of As,Pb,Bi are 0.081 9%,0.039 2% and 0.118 7%,respectively.The product is rhombohedral particles with the advantages of uniform size and its chemical formula is Sb4O5Cl2.