Abstract:A large amount of acid ferric sulfate solution is produced after acid leaching of gold tailings from roasting cyanidation process. Its high value utilization is limited because of its high arsenic content. Method to remove arsenic by iron powder pre-reduction and ferrous sulfide dearsenization was investigated. The results show that existing form and distribution of arsenic in solution are closely related to potential of solution system, and iron powder can effectively reduce potential of solution. Arsenic in ferric sulfate solution after pre-reduction with iron powder can be effectively removed by ferrous sulfide. When amount of iron powder is 0.6 times of iron content in solution, arsenic content in solution can be reduced from 0.253 g/L to 4.79 mg/L after adding 36.6 g/L FeS into solution and stirring for 30 min. Air has an adverse effect on arsenic removal process.