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Method for extracting aurum from difficult-to-handle sulphide ore aurum concentrate by two-segment pressurization leaching method

A technology of pressurized oxygen leaching and gold sulfide, which is applied in the direction of improving process efficiency, etc., to achieve the effects of short process, no pollution of three wastes, and avoiding strong corrosion

Inactive Publication Date: 2010-11-03
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

[0045] The chemical composition (mass fraction, %) of a high-arsenic and low-grade gold sulfide concentrate from a certain mine in Hunan is as follows: As 10.02, S36.40, Fe 42.43, Zn 1.05, Si 3.69, Al 0.98, Mg 0.85, Ca 1.21, Au 24.62 g / t.

[0046] Pretreatment conditions for pressurized oxidation: Fe 3+ 20.0g / L, SO 4 2- 1.5mol / L leaching agent, 150g / L gold concentrate, 0.4% gold concentrate sodium lignosulfonate, controlled oxygen pressure 1.4Mpa, temperature 160°C, reacted for 1.0 hour, liquid-solid separation.

[0047] Leaching conditions of pretreatment residue ammonium thiocyanate solution: NH 4 SCN 0.2mol / L solution, Fe 3+ 2.0g / L, 150g / L of pretreatment residue, add it to the reactor and mix it with industrial sulfuric acid or lime to adjust the pH to 2.5; control the temperature of the reactor to 160℃, and feed oxygen to maintain the pressure in the reactor at 1.4MPa. Reaction for 1.0 hour; after cooling, solid-liquid separation and washing, the slag contains less than 4g / t g...

Embodiment 2

[0049] The chemical composition (mass fraction, %) of a certain mineral sulfide gold concentrate is as follows: As 6.2, S 14.48, Fe 13.64, Cu0.05, Si 34.2, Al3.2, Mg 1.15, Ca 2.11, Au 65.89g / t.

[0050] Pretreatment conditions for pressurized oxidation: Fe 2+ 9.0g / L, SO 4 2- 1.0mol / L leaching agent, gold concentrate amount 300g / L, add 0.08% gold concentrate amount of sodium lignosulfonate, control oxygen pressure 1.0Mpa, temperature 130°C, react for 4.0 hours, liquid-solid separation.

[0051] Leaching conditions of pretreatment residue ammonium thiocyanate solution: NH 4 SCN 0.8mol / L solution, Fe 2+ 4.0g / L, 300g / L of pretreatment residue, add it to the reactor and mix with industrial sulfuric acid or lime to adjust the pH to 1.5; control the temperature of the reactor to 120°C, and pass oxygen to maintain the pressure in the reactor at 1.0MPa, Reaction for 6.0 hours; after cooling, solid-liquid separation and washing, the residue contains 4.1 g / t of gold, and the gold leaching rate...

Embodiment 3

[0053] The chemical composition (mass fraction, %) of a certain mineral sulfide gold concentrate 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.

[0054] Pretreatment conditions for pressurized oxidation: 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 under normal pressure for 1 hour to decompose carbonate, and then control oxygen pressure 0.8Mpa, temperature 140℃, reaction for 2.0 hours, liquid-solid separation.

[0055] Leaching conditions of pretreatment residue ammonium thiocyanate solution: NH 4 SC N 4.0mol / L solution, Fe 3+ 8.0g / L, 200g / L of pretreatment residue, add it to the reactor and mix with industrial sulfuric acid or lime to adjust the pH to 1.8; control the temperature of the reactor to 140°C, and feed oxygen to maintain the pressure in the reactor at 1.2MPa, Reaction for 3.0 hours; after cooling, solid...

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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 gold concentrates of refractory sulfide ore. technical background [0002] Refractory gold reserves account for 30% of the world’s total gold reserves, and my country accounts for more than 20%, of which refractory gold deposits containing arsenic account for the vast majority. There is no successful precedent for the selective leaching of gold by direct cyanidation. At present, for refractory gold concentrates containing arsenic, the treatment scheme is basically to perform oxidation pretreatment and then cyanide leaching of gold. There are four oxidation pretreatment schemes: chemical oxidation method, roasting method, pressure oxidation method and bacterial oxidation method. Biological pretreatment-cyanidation method (Yang Hongying, et al. Cyanide gold extraction method for arsenic-resistant bacteria oxidation pretreatment of high arsenic compl...

Claims

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Application Information

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Patent Type & Authority Applications(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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