Biochemical decomposition and gold leaching of refractory ultrafine grinding sulfur concentrates 3

It has been confirmed that recycling of the hydrolyzate solution is possible in principle. Solution was after the second and third cycles, and then re-added to the concentrate leaching of gold, the reaction time decreased the ability of the solvent and a third of one-half. If the solution is re-concentrated with a new solvent, a higher process specification can be achieved.

Reasonable analysis of adsorption leaching residue shows that the decomposition of gold associated with sulfide is high and is mainly decomposed by chemical methods; the content of gold is from the original concentrate. 25.8 grams / ton reduced to jet milled product 15.2 grams / ton and leach tailings 2.8 grams / ton.

The distribution of arsenic in each stage of the treatment was also studied. When treated with alkaline hydrolysis product concentrate, arsenic, pyrite decomposition, and 70 to 75% of the arsenic into the solution. The arsenic content in the solution does not actually change before and after adsorption, that is, arsenic does not adsorb to the resin. The gold removal solution can be used to remove arsenic by known methods prior to throwing away.

In view of the results of the completed comprehensive study, it is recommended to adopt the principle process flow (Figure 5 ). Large-scale trials for the treatment of difficult gold-arsenic concentrates. According to this procedure, the concentrate is ground by a jet mill and adsorbed and leached with an alkaline solution of the protein hydrolysate.

In addition to favorable concentrate activation conditions, the use of jet mills has the following advantages: This equipment has been mastered by the industry and has high productivity (up to 100 tons / hour), simple structure, low metal consumption and low price. The solvent can be obtained from industrially released yeast biomass ( 50% protein containing ) by alkaline hydrolysis and subsequent dilution . In order to understand the gold absorption and regenerating adsorbent, the gold-containing resin was reprocessed according to the standard procedure, and the commercial gold was analyzed by the thiourea eluent. In view of the necessity of precipitating and preserving arsenic-containing deposits and the rationality of the return of the gold-removing solution, the adsorbed leaching slurry is dewatered by a centrifuge. The solution precipitates arsenic by lime, after which most of the solution is diluted by the original hydrolysate.

An expanded technical and economic evaluation of the process, including the cost of obtaining concentrates, 1 gram The cost of gold is within the allowable cost limit

Knot     s

1, if the planetary system as compared with the concentrate jet system ground, the latter tend to use, as the jet milling tailings remaining leach gold content in other planetary milled same process conditions a lower half.

          2. The protein hydrolysate is effective when the activated concentrate is adsorbed and leached. When the liquid: solid = ( 6 ~ 8 ): 1 and treatment time 48 ~ 50 hours, resin gold extraction 80% , leaching time increased to 72 hours, the extraction rate of gold in the hydrolysis solution can be increased to 83.4% . Arsenic is enriched in the gold removal solution and can be precipitated by known methods for storage.

3. It is recommended to use large-scale experiments on the treatment of refractory sulfide concentrate processes based on jet milling and adsorption leaching with protein hydrolysates.

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