Method for extracting gold from refractory sulfide ore gold concentrate by two-stage pressurized oxygen leaching

A technology of pressurized oxygen leaching and gold sulfide, applied in the direction of improving process efficiency, etc., to achieve the effects of inhibiting decomposition reactions, no three waste pollution, and improving reaction speed

Inactive Publication Date: 2012-02-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of thiocyanate oxygen pressure leaching of gold has not been reported in the literature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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.

[0045] Pretreatment conditions of pressurized oxidation: containing Fe 3+ 20.0g / L, SO 4 2- 1.5mol / L leaching agent, gold concentrate amount 150g / L, add 0.4% gold concentrate amount of sodium lignosulfonate, control oxygen pressure 1.4Mpa, temperature 160°C, react for 1.0 hour, liquid-solid separation.

[0046] Pretreatment slag ammonium thiocyanate solution leaching conditions: NH 4 SCN 0.2mol / L solution, Fe 3+ 2.0g / L, the amount of pretreatment slag added is 150g / L, add it into the reactor and mix it, adjust the pH value to 2.5 with industrial sulfuric acid or lime; control the temperature of the reactor at 160°C, and feed oxygen to maintain the pressure in the reactor at 1.4MPa, React for 1.0 hour; after cooling down, solid-liquid separation a...

Embodiment 2

[0048] The chemical composition (mass fraction, %) of gold sulfide concentrate produced by a mine is as follows: As 6.2, S 14.48, Fe 13.64, Cu 0.05, Si 34.2, Al 3.2, Mg 1.15, Ca 2.11, Au 65.89g / t.

[0049] Pretreatment conditions of pressurized oxidation: containing Fe 2+ 9.0g / L, SO 4 2- 1.0mol / L leaching agent, 300g / L gold concentrate, add 0.08% gold concentrate sodium lignosulfonate, control oxygen pressure 1.0Mpa, temperature 130°C, react for 4.0 hours, liquid-solid separation.

[0050] Pretreatment slag ammonium thiocyanate solution leaching conditions: NH 4 SCN 0.8mol / L solution, Fe 3+ 4.0g / L, the amount of pretreatment slag added is 300g / L, add it into the reactor and adjust the pH value to 1.5 with industrial sulfuric acid or lime; React for 6.0 hours; after cooling down, solid-liquid separation and washing, the slag contains 4.1g / t of gold, and the gold leaching rate is 94.4%. Press Extract V 有机相 / V water phase = 2 / 10, 3-stage extraction, the extraction rate of gol...

Embodiment 3

[0052] 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.

[0053] Pretreatment conditions of pressurized oxidation: containing Fe 3+ 3.0g / L, SO 4 2- 3.0mol / L leaching agent, gold concentrate amount 200g / L, add 0.1% gold concentrate amount of sodium lignosulfonate, first react at 90°C for 1 hour under normal pressure to decompose the carbonate, and then control the oxygen pressure 0.8Mpa, temperature 140°C, react for 2.0 hours, liquid-solid separation.

[0054] Pretreatment slag ammonium thiocyanate solution leaching conditions: NH 4 SCN 4.0mol / L solution, Fe 3+ 8.0g / L, the amount of pretreatment slag added is 200g / L, add it to the reactor and mix it, adjust the pH value to 1.8 with industrial sulfuric acid or lime; control the temperature of the reactor at 140°C, and feed oxygen to maintain the pressure in the reactor at 1.2MPa, ...

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Abstract

The invention relates to a method for extracting aurum from difficult-to-handle sulphide ore aurum concentrate by two-segment pressurization leaching method comprising two segments of pressurization oxidation preprocessing and pressurization oxidation aurum leaching. The method comprises the steps of: firstly, pressurizing and oxidizing base metal sulfide such as iron sulfide with sulfuric acid-iron sulfate, wherein most S2- and S22- are oxidized into elemental sulfur; and secondly, pressurizing and leaching the preprocessed slag with thiocyanate so that aurum is selectively dissolved in the solution in the form of aurum-thiocyanic acid compound. Therefore, the pre-oxidation slag can be directly leached without neutralization, the technical process is short, the aurum recovery rate is high, the cost is low and pollution of low-concentration SO2 smoke gas, As2O3 smoke dust, and the like is avoided.

Description

technical field [0001] The invention belongs to non-ferrous metal wet extraction metallurgy and is suitable for extracting gold from refractory sulfide ore gold concentrate. technical background [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 2008100112...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B3/08C22B11/08
CPCY02P10/20
Inventor 杨声海郭欢杨星唐谟堂何静唐朝波杨建广陈永明
Owner CENT SOUTH UNIV
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