The carbon slurry process includes the main operations such as raw material preparation and activated carbon regeneration. The process flow is shown in Figure 8-2.
(1) Preparation of raw materials
Grinding the gold-containing material to a suitable cyanide particle size, generally requiring less than 28 mesh and removing impurities such as wood chips, and concentration and dehydration to achieve a concentration of 45 to 50% of the leaching slurry;
(2) Stirring leaching
As with the conventional cyanidation method, it is generally 5 to 8 stirring tanks.
(3) Carbon adsorption
The cyanide slurry enters the agitation adsorption tank (carbon slurry tank). The Linghu gold mine in Henan Province is equipped with a format sieve and a slurry riser in the suction slag, which is used to realize the reverse flow of the activated carbon and the slurry, and adsorb the dissolved gold in the slurry. Bridge screens reduce the wear of activated carbon. At present, the sieve holes of the bridge sieve are easily blocked by activated carbon, and are cleaned with compressed air.
(4) Desorption of gold-loaded charcoal
At present, four methods can be used for desorption; (1) desorption of hot caustic sodium cyanide solution; (2) desorption of sodium caustic cyanide solution plus alcohol desorption; (3) desorption with caustic sodium cyanide solution under heating and pressure; (4) Desorption of high concentration caustic sodium cyanide solution.
(5) Electrowinning method or conventional zinc powder replacement precipitation gold
Desorption of gold-loaded carbon can obtain a high-grade noble liquid containing gold up to 600 g/m3, and gold powder is obtained by electrowinning and zinc replacement, and sent to obtain a gold ingot.
(6) Recycling of activated carbon
The desorbed activated carbon is first acid washed with dilute sulfuric acid (nitric acid) to remove carbonates and the like, and after several times of use, thermal activation is required to restore the adsorption activity of the carbon.
The carbon slurry method is mainly applied to gold-bearing oxidized ore with high sludge content. The ore is high in mud and difficult to separate solid and liquid. The existing filter can not effectively separate the precious liquid and the slag, so the conventional cyanidation method cannot Get better technical and economic indicators. Practice shows that the carbon slurry method has achieved good results in industrial production. The gold content of Linghu Gold Mine is about 8 g/ton, and the total recovery rate of gold is 93%~94%.
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