Comprehensive recovery method for directly cyanating and intensified leaching multi-metal gold ore concentrate

Abstract

The invention discloses a comprehensive recovery method for directly cyaniding, consolidating and leaching polymetallic gold concentrate, which comprises the following steps: after the gold concentrate is pulped, fractionated and grinded, qualified grinded and fractionated products are subjected to dehydration and reagent removal operation, and underflow is subjected to pre-alkaline leaching operation; pulp after alkaline leaching is subjected to alkaline leaching and pressure filtration; pulp after primary cyaniding leaching is subjected to primary washing, and 99.9 percent of finished products, namely gold ingots/silver ingots are produced; the underflow after primary washing is subjected to secondary leaching operation, and leached pulp is subjected to countercurrent washing; washed underflow pulp is subjected to pressure filtration; pulp after pulping is subjected to cyanide residue floatation operation, and gold lead concentrate, copper concentrate and sulfur concentrate are respectively recovered by floatation and taken as concentrate goods for sale; and tailings after floatation are subjected to pressure filtration and discharged as waste tailings. The method improves the recovery rate of difficulty leached gold concentrate to more than 96 percent, simultaneously reduces equipment investment, shortens the leaching technological flow, and reduces the metal overstock flow. The direct cyanidation recovery rate of gold reaches more than 96 percent, and the comprehensive recovery rate of the gold reaches more than 98 percent, so as to reach the advanced level in the same industry in China.

Description

technical field [0001] The invention relates to a comprehensive recovery method for direct cyanidation enhanced leaching of polymetallic gold concentrates, belonging to the technical field of metallurgy. Background technique [0002] Due to the complex properties of some gold concentrates, rich in copper and pyrrhotite, etc., there are some fine particles wrapped according to the embedded particle size of gold, and the proportion of wrapped gold is relatively large, and the proportion of rich pyrrhotite accounts for 13%. In the above cases, these gold concentrates adopt conventional cyanidation leaching operations, and the leaching rate is low, and the experimental leaching rate is 85-90%, which makes it difficult to cyanide leaching. Conventional cyanide leaching operations need to consume more cyanide, the cost of cyanide smelting is high, and the gold leaching rate is low. In addition, a large amount of cyanide-containing sewage is discharged, which seriously pollutes the...

AI Technical Summary

Problems solved by technology

[0002] Due to the complex properties of some gold concentrates, rich in copper and pyrrhotite, etc., there are some fine particles wrapped according to the embedded particle size of gold, and the proportion of wrapped gold is relatively large, and the proportion of rich pyrrhotite accounts for 13%. In the above cases, these gold concentrates adopt conventional cyanidation leaching operations, the leaching rate is low, and the experimental leaching rate is 85-90%, which makes it difficult to cyanide leaching.

The conventional cyanide leaching operation needs to consume more cyanide, the cost of cyanide smelting is high, the gold leaching rate is low, and it also causes a large amount of cyanide-containing sewage to be discharged, which seriously pollutes the surrounding environment

In addition, the existing cyanidation method can only leach gold or silver, and the cyanide residue is directly discarded, which pollutes the environment, occupies a large amount of land, and causes a waste of resources

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