Method for extracting gold from gold-containing oxidized ore

A technology for oxidizing ore and ore pulp, applied in the field of gold extraction, can solve the problems of long operation cycle, high energy consumption and poor economic benefits, etc.

Active Publication Date: 2015-08-05
YUNNAN GOLD MINING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For low-grade gold-bearing oxide ores, if conventional cyanidation is used to extract gold, the process and equipment will be complicated, the operation cycle will be long, and the energy consumption will be large;...

Method used

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  • Method for extracting gold from gold-containing oxidized ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Experimental raw materials:

[0053] The ores of gold-bearing oxide ores all come from a mine in Yunnan Province, which are low-grade gold-bearing oxide ores, with a gold content of 1.57g / t and a silver content of 37.2g / t.

[0054] Experimental steps:

[0055] (1) Finely grind the ore containing gold oxide ore to -325 mesh>85%;

[0056] (2) Add 8kg / t of lime to the finely ground ore as a protective base, and adjust the slurry at 2:1 according to the liquid-solid ratio to obtain the ore slurry;

[0057] (3) Put the ore pulp into the autoclave, add 2kg / t sodium cyanide, feed air, adjust the pressurized pressure to 0.6MPa, the stirring speed to 800r / min, and pre-cyanide for 1h;

[0058] (4) After the pre-cyanidation is completed, add columnar activated carbon with a particle size of +16 mesh 20g / L, and carbon soak for 8h;

[0059] (5) After the carbon leaching is finished, the gold-carrying carbon in the pulp is extracted through a 30-mesh sieve;

[0060] (6) After car...

Embodiment 2

[0062] Experimental raw materials:

[0063] The ores of the gold-bearing oxide ores all come from a mine in Yunnan, which are low-grade gold-bearing oxide ores, with a gold content of 2.51g / t and a silver content of 35.2g / t.

[0064] Experimental steps:

[0065] (1) The gold-bearing oxide ore is finely ground to -325 mesh>85%;

[0066] (2) Add 8kg / t of lime to the finely ground ore as a protective base, and adjust the slurry at a liquid-solid ratio of 3:1 to obtain the slurry;

[0067] (3) Put the ore pulp into the autoclave, add 3kg / t sodium cyanide, feed air, adjust the pressurized pressure to 0.8MPa, the stirring speed is 1000r / min, and cyanide in advance for 1h;

[0068] (4) After the pre-cyanidation is completed, add columnar activated carbon with a particle size of +16 mesh 30g / L, and carbon soak for 6h;

[0069] (5) After the carbon leaching is finished, the gold-carrying carbon in the pulp is extracted through a 30-mesh sieve;

[0070] (6) After carbon leaching tai...

Embodiment 3

[0072] Experimental raw materials:

[0073] The ores of the gold-bearing oxide ores all come from a mine in Yunnan, which are low-grade gold-bearing oxide ores, with a gold content of 3.21g / t and a silver content of 27.56g / t.

[0074] Experimental steps:

[0075] (1) The gold-bearing oxide ore is finely ground to -325 mesh>85%;

[0076] (2) Add 8kg / t of lime to the finely ground ore as a protective base, and adjust the slurry at a liquid-solid ratio of 4:1 to obtain ore slurry;

[0077] (3) Put the ore pulp into the autoclave, add 3kg / t sodium cyanide, feed air, adjust the pressurized pressure to 1.0MPa, the stirring speed to 1200r / min, and pre-cyanide for 1h;

[0078] (4) After the pre-cyanidation is completed, add columnar activated carbon with a particle size of 40 g / L at +16 mesh, and charcoal soak for 4 hours;

[0079] (5) After the carbon leaching is finished, the gold-carrying carbon in the pulp is extracted through a 30-mesh sieve;

[0080] (6) After carbon leachin...

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Abstract

The invention discloses a method for extracting gold from gold-containing oxidized ore. The method comprises the steps: (1) finely grinding the gold-containing oxidized ore, thereby obtaining ore powder; (2) adding water and lime to the ore powder to perform slurry-mixing treatment, thereby obtaining ore slurry; (3) pre-cyaniding the ore slurry in use of a pressurization reactor; (4) adding active carbon to the pre-cyanided ore slurry in the pressurization reactor, cyaniding and carbon-leaching, and enabling the active carbon to absorb complex gold ions generated in cyaniding treatment; (5) filtering the ore liquid obtained in the step (4) and separating to obtain active carbon absorbed with the complex gold ions, and the ore slurry after gold extraction; (6) desorbing the active carbon absorbed with the complex gold ions, thereby obtaining gold. When the method is used for extracting gold, gold leaching rate and absorption rate of active carbon are high, production process of gold extraction is simple and easy in operation, production period is short and production benefit is high.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for extracting gold from gold-bearing oxide ores. Background technique [0002] With the advancement of mining and dressing technology and equipment, the increase of the depth of mining deposits, and the continuous expansion of production scale, gold reserves are constantly decreasing. In order to fully and rationally mine and utilize gold resources, the research and development of gold extraction technology for gold-bearing resources such as ores and tailings that are difficult to mine, complex in nature, and low-grade has attracted more and more attention from domestic and foreign dressing and metallurgy researchers. And proposed three kinds of processing methods: 1) pre-oxidation treatment before cyanide gold leaching, such as roasting oxidation, pressurized oxidation, atmospheric pressure oxidation, bacterial oxidation, nitric acid catalytic oxidation, microw...

Claims

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Application Information

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IPC IPC(8): C22B11/08C22B11/00
Inventor 甘胤吴建存高起方刘志斌方锦李奇伟
Owner YUNNAN GOLD MINING GRP
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