Gold concentrate cyanidation process

Cyanide---Zinc powder replacement gold extraction process mainly includes dosing aeration, stirring leaching, countercurrent washing, zinc powder replacement, gold mud smelting, tailings pressure filtration, sewage treatment and other stages.

1. Stirring and leaching---Gold leaching is mainly realized in the leaching tank. The cyanide-containing pulp is strongly stirred under the action of the impeller and compressed air, which is beneficial to improve the leaching effect. The leaching tank is usually configured in multiple stages;

2. Countercurrent washing---It is a process adopted by cyanide plants. It is usually in the form of multiple single-layer or multi-layer thickeners. The function of countercurrent washing is to use the supernatant water of the next thickener to feed into a thickener. By "diluting" the pulp, the taste of the liquid gold is gradually reduced until the established standard is reached. Countercurrent washing is the process of "dilution" concentration of the slurry. Some cyanide plants also increase the pressure filtration operation before washing, and the filter cake is added to the washing water to adjust the slurry before washing. The supernatant of the first thickener is usually supplied as a precious liquid to the zinc powder replacement operation.

3, zinc powder replacement --- is the process of adding metal reducing agent (zinc powder) to cyanide precious liquid, through chemical reaction to precipitate gold and silver into gold mud, usually Including the deoxidation of precious liquid, the addition of zinc powder and lead acetate, and the production of gold mud by pressure filtration.

Processing equipment

Vibration feeding machine	Washing and concentrating machine	Cone crusher	Vibrating screen
Zinc powder feeder	Ball mill	Thickener	Plate filter press