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The cyanide gold mud obtained by the zinc wire replacement method usually contains about 20% of gold, and usually contains 20% to 50% of zinc. It also contains impurities such as silver , copper , lead , zinc, iron , sulfur, silica, etc., so it is often necessary to smelt. The acid treatment is performed before to remove most impurities such as zinc. The pickling solvent is a 10% to 15% dilute sulfuric acid solution. When pickling, the gold mud is first sieved to remove the bulk zinc wire, and then filtered by a filter press to remove the poor liquid. The filter cake gold mud is packed into an acid-resistant mechanical stirring tank, and dilute sulfuric acid is added to stir to dissolve the zinc. The chemical reaction formula is:
Zn+H 2 SO 4 â•ZnSO 4 +H 2 ↑
After completely dissolving, the stirring was stopped, and the mixture was allowed to stand for about 12 hours, and then the clear liquid was aspirated and the clear liquid was filtered by a filter press to recover the microfluid taken away by the clear liquid. The sediment in the tank is added to the hot water and stirred and washed twice, and the washing water still needs to be filtered to recover the micro mud. Finally, the gold mud in the tank can be smelted after being filtered and dried. The acid washing liquid is added with sodium carbonate, and then calcined to obtain zinc oxide.
The cyanide gold mud obtained by the zinc powder replacement method usually contains 15% to 20% of gold and 10% to 25% of zinc. The phase is relatively pure and can be directly smelted without acid treatment.
Pretreatment of cyanide gold mud before smelting
Gold Mine zinc substitution method is powder (silk) a rich source of gold from cyanide-containing precipitate Jingui black sludge was replaced obtained.