A process for removing impurities from industrial silver smelting process lean liquid cyanide

The present invention provides a method of removing cyanide containing silver Smelting lean liquid impurities, mainly from the buffer tank A and B, the electrolytic concentration tank, the composition of the anolyte reservoir. A lean liquid and B buffer tank influent inlet chamber and the recovery of cyanide, A and B are interchanged concentration during production as a cathode chamber of an electrolytic tank concentrated. Between the cathode and the anolyte concentration tank plus anion and cation exchange membrane to separate the cathode and anode to form a cathode chamber, an anode compartment and a recovery compartment cyanide. Cyanide lean liquid into the cathode compartment electrolytic concentration tank to be treated in the cathode chamber is electrolyzed copper zinc and other metal ions, released CN-, CN- released into the recovery compartment cyanide under an electric field, only cyanide recovery compartment is concentrated, is not oxidized, it is not lost. Cu containing cyanide-depleted liquid, Zn is lowered in the cathode electrolytic deposition chamber, the concentration, when the concentration drops to a certain extent, the buffer tank be replaced with a new cyanide lean liquid into the cathode compartment is electrolyzed only low concentrations the lean liquid inlet cyanide cyanide recovery compartment, recovered silver cyanide extraction process returns to achieve all the back of the lean liquid containing cyanomethyl.