Method for leaching gold from refractory gold sulfide concentrate by using alkaline thiocyanate solution under oxygen pressure

A thiocyanate, alkaline solution technology, applied in the direction of improving process efficiency, can solve the problems of low production efficiency, high gold recovery rate, long process flow, etc., and achieves low cost, improved leaching rate, and short process flow. Effect

Inactive Publication Date: 2011-11-16
CENT SOUTH UNIV
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Problems solved by technology

Although the pre-oxidized slag does not need to be neutralized, it can directly leaching gold, the recovery rate of gold is high, and there is no low concentration of SO 2 Smoke and As 2 o 3 The shortcomings of pollution such as smoke and dust, but the process flow is long and the production efficiency is low. On this basis, we proposed a method for direct oxygen pressure leaching of gold from refractory gold sulfide concentrates with alkaline thiocyanate solution

Method used

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  • Method for leaching gold from refractory gold sulfide concentrate by using alkaline thiocyanate solution under oxygen pressure

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Effect test

Embodiment 1

[0041] The chemical composition (mass fraction, %) of high-arsenic and low-grade gold sulfide concentrate from a mine in Hunan is as follows: As10.02, S 36.40, Fe 42.43, Zn 1.05, Si 3.69, Al 0.98, Mg 0.85, Ca 1.21, Au 24.62 g / t.

[0042] The leaching conditions of alkaline thiocyanate solution for direct oxygen pressure leaching of gold from refractory gold sulfide concentrate: ammonium thiocyanate 1.5M, solid-to-liquid ratio 250g / L, ammonia addition is the theoretical consumption (theoretical consumption of ammonia The amount is 22.76M / kg gold concentrate). 1.2 times (ie 6.83M), oxygen pressure 0.6MPa, temperature 120 ℃ under the conditions of leaching for 8.0h. After filtering, the gold content in the filtrate was analyzed to obtain a gold leaching rate of 90.86%; the filtrate was replaced with iron powder three times the theoretical consumption for 1.0 h at room temperature, and the gold replacement recovery rate was 99.5%. The sulfate radical in the filtrate is 2.52M. Af...

Embodiment 2

[0044] The chemical composition (mass fraction, %) of gold sulfide concentrate produced by a mine is as follows: As 6.2, S 14.48, Fe13.64, Cu 0.05, Si 34.2, Al 3.2, Mg 1.15, Ca 2.11, Au 65.89g / t.

[0045] The leaching conditions of alkaline thiocyanate solution for direct oxygen pressure leaching of gold from refractory gold sulfide concentrate: ammonium thiocyanate 0.2M, solid-to-liquid ratio 200g / L, ammonia addition is the theoretical consumption (theoretical consumption of ammonia The amount is 1.5 times (2.71M) of 9.05M / kg gold concentrate), the oxygen pressure is 1.5MPa, and the temperature is 180°C for 2.0h. The pulp solution after leaching is used to adsorb gold with 3-stage countercurrent activated carbon at 70°C, and the recovery rate of gold is 94.65%. Ammonium concentration, returned for next leaching.

Embodiment 3

[0047] The chemical composition (mass fraction, %) of gold sulfide concentrate produced by a mine is as follows: As 0.56, S 8.48, Fe 11.34, Cu 0.04, Al 1.25, Mg 10.02, Ca 4.87, Au 83.78g / t, Ag 1252g / t.

[0048] The leaching conditions of alkaline thiocyanate solution for direct oxygen pressure leaching of gold from refractory gold sulfide concentrate: calcium thiocyanate 3.0M, solid-to-liquid ratio 120g / L, calcium hydroxide addition is the theoretical consumption (hydroxide The theoretical consumption of calcium is 2.5 times (ie 0.79M) of 2.65M / kg gold concentrate), oxygen pressure is 0.4MPa, and temperature is 160℃ for 4.0h. The pulp solution after leaching is used to adsorb gold with 5-stage countercurrent activated carbon at 30°C, and the recovery rate of gold is 95.78%. After filtering, the sulfate radical in the solution is 0.01M, adjust the concentration of calcium thiocyanate, and return to the next leaching. The leaching rate of silver is 92.19%.

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Abstract

The invention discloses a method for leaching gold from a refractory gold sulfide concentrate by using alkaline thiocyanate solution under oxygen pressure, which comprises the following steps of: leaching at the temperature of between 110 and 200 DEG C under the oxygen pressure of 0.3 to 1.5MPa for 1.0 to 8.0 hours by using alkaline solution containing 0.1 to 3.0M thiocyanate in a solid-to-liquid ratio of 100 to 300g/L; and separating and recovering the gold from the solution to obtain waste liquid, regenerating to obtain alkali, and returning to the next leaching. The refractory gold concentrate is directly leached by the alkaline thiocyanate solution under the oxygen pressure without being pretreated, the process flow is short, efficiency is high, and cost is low; roasting is eliminated, and the pollution of low-concentration SO2 flue gas, As2O3 smoke and the like is avoided; and during oxygen pressure leaching, the gold is subjected to oxidative cooperated leaching while sulfide minerals in the gold concentrate are subjected to oxidative decomposition, so that the secondary packaging of the gold is avoided, and the leaching rate of the gold is improved.

Description

technical field [0001] The invention belongs to non-ferrous metal wet extraction metallurgy and is suitable for extracting gold from refractory gold sulfide concentrates. Background technique [0002] Refractory gold ore reserves account for 30% of the world's total gold ore reserves, and my country accounts for more than 20%, of which arsenic-containing refractory gold ore accounts for the vast majority. There is no successful precedent for direct cyanidation selective leaching of gold. At present, the treatment plan for arsenic-containing refractory gold concentrate is basically oxidation pretreatment first, and then cyanide leaching of gold. There are four oxidation pretreatment schemes: chemical oxidation, roasting, pressurized oxidation and bacterial oxidation. Biological pretreatment-cyanide method (Yang Hongying, et al. Oxidative pretreatment of high-arsenic complex and refractory gold ore by arsenic-resistant bacteria-cyanide gold extraction method, CN 200810011233....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B11/00
CPCY02P10/20
Inventor 杨声海陈永明夏姣云何静郭欢王冠超
Owner CENT SOUTH UNIV
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