2017 Volume 57 Issue 3 Pages 581-586
The recovery of antimony from high arsenic-bearing flue dusts was carried out by a selective oxidation roasting process using MnO2, in which the arsenic was removed through a volatilization and antimony was oxidized to Sb2O4 staying in the roasted products. In a certain range, the MnO2 additive has an active effective on the arsenic volatilization for the reason that structures of some complicated As-Sb phases were destroyed after the Sb2O3 being oxidized to Sb2O4 and this part of arsenic continued to volatile. About 90.06% arsenic and only about 6.89% antimony went into smoke under the condition of roasting temperature of 723.0 K, MnO2 amount of 20.5%, and roasting time of 90 min. The MnO2 selective oxidation provided a good separation of arsenic from high arsenic-bearing flue dusts. The left antimony existing in the roasted products can be reclaimed through a process of reduction roasting and dust collection.