China Nonferrous Metallurgy

Aiming at the leaching high-sulfur residue produced in arsenic filter cake treatment process, the elemental sulfur removal process was studied to enrich the valuable metals in the material and realize the recovery and utilization of resources. In this paper, hot leaching method with sulfurizing agent was used to treat the leaching residue of arsenic filter cake. The test results showed that the best leaching conditions were as follows: when the concentration of leaching agent sodium sulfide was 2.00mol/L, the ratio of liquid to solid was 8∶1, and the reaction was carried out at 85℃ for 2h, the leaching rate of elemental sulfur was 98.1% and that of arsenic was 99.0%, while the valuable metals such as bismuth, lead and copper were almost not leached; at the same time, the leachate can be used as sulfurizing agent to precipitate copper ions in waste liquid, and its precipitation efficiency is equivalent to that of sodium sulfide solution, so that the reagent can be fully utilized. This experiment can realize the efficient removal of elemental sulfur in one step and reduce the arsenic content in materials simultaneously.