The cyanide tailings were treated with slurry chlorination electrolysis technology,and the influencing factors and reaction mechanism of pyrite dissolution during the electrolysis process are mainly studied.Results indicated that the average leaching rate of Fe in the cyanide tailings reaches 89.05 %,and the mass loss rate is 38.96 % when the pulp concentration was 10 g/L,the current density was 800 A/m2,the NaCl dosage was 50 g/L,and the reaction time was 2.0 h.The gold grade of the tailings after treatment is increased from 1.19 g/t to 1.96 g/t,which is of great importance for resource utilization,reduction,and value-added utilization of cyanide tailings.In the process of slurry electrolysis,pyrite is oxidized to Fe3＋ and SO2-4 at the anode,and reduced to pyrrhotite at the cathode.Cl- is oxidized at the anode to generate Cl2,and Cl2 dissolves in the solution to generate HClO and ClO-.Pyrite and pyrrhotite are oxidized by HClO,ClO- and enter into solution in the form of Fe3＋ and HSO-4.