Biochemical decomposition and gold leaching of refractory ultrafine grinding sulfur concentrates 2

An actual possibility has been proposed earlier: the use of an alkaline hydrolyzate of yeast biomass, and a mixed solution of a hydrolysate and sodium cyanide to decompose and leach gold from the activated concentrate. The following ingredients were obtained by treating the industry to produce feed yeast in a caustic soda solution. Decomposition product; total amino acid amount 5 grams / L, nucleic acid 0.5~ 0.8 g / L, lipid compound 1 -2 grams / Liter and NaOH20~ 30 grams / L. The liquid: solid minimum ratio that guarantees the highest indicator of withdrawal gold must be determined. Liquid: solid = 8 : 1 and more are hydrolysates (amino acids 2 grams The ideal ratio of the mixed solution of sodium / cyanide ( 0.15% ), at which point the recovery of solution gold is ~70% (Fig. 3 ). However, under such dilution conditions, only 40% of Au was transferred to the hydrolyzate solution without addition of cyanide. The extraction rate of gold is actually directly dependent on the ratio of liquid to solid. When the slurry is diluted to liquid: solid = 16 : 1 , the extraction rate can also reach 70% .

The gold was leached with the observation solution mainly during the first 48 hours of treatment (Fig. 4 ). Hydrolyzate with activated concentrate leach extractables 96 hours 62% Au, but with the same added cyanide - 76% solution can be extracted. In the presence of an oxidizing agent without sodium cyanide, the efficiency of the hydrolyzate solution is significantly improved, and nearly 76% of Au can be extracted .

Gold was extracted from the hydrolyzed product solution using AM-2B resin. When the metal in the solution   At a balanced concentration of 1.4 mg / l, the saturated resin capacity of gold is 40 mg / g. When a gold extraction times lower, the recycled resin without losing its adsorption properties.    

According to the test results, it can be considered that the adsorption leaching test for improving the conditions for extracting gold and extracting the index has achieved the intended purpose. In the adsorption leaching test, the amount of the resin AM-2B added was 5% by weight of the solid product . It has been found that when liquid: solid = 6 : 1 (see table), most of the gold is extracted within 48 to 50 hours. Under these conditions, 76.8% Au adsorbed to the resin, i.e., the filtering process to achieve a general index index compared therewith, when the liquid: solid = 10: 1, with sodium cyanide or hydrolyzate and the hydrolyzate with an oxidizing agent The mixed solution is leached, and when the liquid = solid 16 : 1 :, it is leached with the hydrolyzate solution).

When the liquid: solid = ( 8-10 ): 1 , the adsorption leaching time increased to 72 hours, which can increase the gold extraction rate to 83.4% and obtain the gold residual content. 5 grams / ton of tailings. The jet pulverized concentrate is adsorbed and leached at different pulp densities. The adsorption leaching time was 48 hours, and the resin addition amount was 5% .

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