Abstract: In order to ensure that the ore dressing wastewater from a tungsten polymetallic ore in Hu⁃ nan meets the discharge standard，aiming at the complex properties of a wide variety of residual agents in the wastewater，the“Fenton method”is used to reduce the chemical oxygen demand（COD）in wastewater by using composite ferric salt，sulfuric acid，catalyst，hydrogen peroxide，sodium hydrosulfide，PAM， caustic sodium and other chemical reagents for wastewater treatment. The results show that the beneficia⁃ tion wastewater is pre-treated by adding polyferric sulfate before it flows into the tailings pond. After the tailings pond reacts and settles，it enters the wastewater treatment station. When the COD content of the raw water is 163 mg/L，sulfuric acid is added to adjust the pH value of the wastewater to 3.5，and then 800 mg/L catalyst ferrous sulfate and 600 mg/L hydrogen peroxide are added to decompose the organic mat⁃ ter. Then 200 mg/L liquid alkali is added to adjust the pH value of the wastewater to 8，and then 3 mg/L PAM is added for flocculation and sedimentation，then 5 mg/L sodium hydrosulfide is added to react with metal ions for metathesis reaction to form metal sulfide precipitation. After the treatment of this process， the COD concentration of the beneficiation wastewater can be reduced to about 30 mg/L，which is far lower than the national standard discharge standard. It provides a solution for the efficient treatment and standard discharge of the tungsten polymetallic ore beneficiation wastewater，and can provide experience reference for other similar mines.

Key words: tungsten polymetallic ore, wastewater, Fenton method, COD, discharge in compliance with standards