Abstract:Two schemes were used to study the feasibility of coagulation and sedimentation method for COD removal from a mineral processing wastewater from a multi - metal mine in Hunan Province. Polyferric sulfate (PFS) and ferrous sulfate heptahydrate were used as water treatment agents in the total tailings. The effects of initial pH, coagulant types and dosage of pharmaceuticals on COD removal of mineral processing wastewater were investigated. The results showed that the addition of polyferric sulfate was 1g/L, the COD decreased from 186mg/L to 121 mg/L. Or the initial pH in the tailings reservoir was 7-9, adding ferrous sulfate heptahydrate 500mg/L, COD decreased from 135mg/L to 88mg/L. The author uses the first program to carry out the industrial test, and achieved good indicators. The drainage pH was 6-9, COD below 100mg/L. To achieve comprehensive wastewater discharge the first standard requirements.