Study on Arsenic Removal from Arsenic-Bearing Silver Concentrate

This is a paper in the field of metallurgical engineering. Flotation silver concentrate from a mine in Guangxi was characterized by XRD and TG, the result displays that, its main components are silver sulfide, ron sulfide, arsenopyrite, manganese sulfide, manganese oxide, etc, and the calcination decomposition temperature is 470~750 ℃. The decomposition products of each component in an oxygen-containing atmosphere are simulated and calculated by thermodynamic software, and the effect of calcination conditions on the removal of arsenic in silver concentrate is studied, the results of which show that the hypoxic environment is conducive to the decomposition of arsenopyrite into As₂O₃, and the optimal calcination conditions are as follows: the flow rate of 400 mL /min is through air, the temperature is raised to 500 ℃ at 10 ℃/min, and the removal rate of arsenic can reach 87.66% after holding for 30 min.