Process for extracting gold from carbonaceous gold concentrate

An extraction process and technology of gold concentrate, which is applied in the field of extraction process of gold in gold concentrate to achieve the effects of reducing environmental pollution, reducing pollution and improving recovery rate

Active Publication Date: 2012-12-26
CHANGCHUN GOLD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide an extraction process of gold in carbonaceous gold concentrate, that is, acid pressure catalytic oxidation-cyanide gold extraction process, which not only solves the problem of oxidation of sulfide minerals, but also can effectively remove Carbonaceous

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  • Process for extracting gold from carbonaceous gold concentrate
  • Process for extracting gold from carbonaceous gold concentrate
  • Process for extracting gold from carbonaceous gold concentrate

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Acid pressure catalytic oxidation operation:

[0045] Adjust the slurry concentration of carbonaceous gold concentrate to 20%; add H 2 SO 4 and NaNO 3 , adjust the PH value of the pulp to 1-2, and feed it into the pressure oxidation system; under the process conditions that the temperature is 210°C, 2.4MPa partial pressure oxygen is filled in stages, and the oxidation time is 120min, the sulfide minerals are fully oxidized and wrapped The gold is fully exposed dissociated. The oxidation liquid is separated from solid and liquid. After the liquid is processed, the clarified liquid is returned to the oxidation system for precipitation and recovery; after the oxidation residue is thickened, it enters the next step of cyanidation to extract gold;

[0046] (2) Cyanide gold extraction operation:

[0047] The oxidation slag in step (1) is slurried to a concentration of 25% to 35%; the pH value of the pulp is 11 to 12; the alkali treatment time is 1.5 to 2.5 hours; the ...

Embodiment 2

[0053] (1) Acid pressure catalytic oxidation operation:

[0054] Adjust the slurry concentration of carbonaceous gold concentrate to 30%; add H 2 SO 4 and NaNO 3 , adjust the PH value of the pulp to 1-2, and feed it into the pressure oxidation system; under the process conditions that the guaranteed temperature is 180 ° C, 1.0 MPa partial pressure oxygen is filled in stages, and the oxidation time is 90 minutes, the sulfide minerals are fully oxidized and wrapped The gold is fully exposed dissociated. The oxidation liquid is separated from solid and liquid. After the liquid is processed, the clarified liquid is returned to the oxidation system for precipitation and recovery; after the oxidation residue is thickened, it enters the next step of cyanidation to extract gold;

[0055] (2) Cyanide gold extraction operation:

[0056] The oxidation slag in step (1) is slurried to a concentration of 25% to 35%; the pH value of the pulp is 11 to 12; the alkali treatment time is 1.5 ...

Embodiment 3

[0062] (1) Acid pressure catalytic oxidation operation:

[0063] Adjust the slurry concentration of carbonaceous gold concentrate to 40%; add H 2 SO 4 and NaNO 3 , adjust the PH value of the pulp to 1~2, and feed it into the pressure oxidation system; under the process conditions that the temperature is 215°C, 2.8MPa partial pressure oxygen is filled in stages, and the oxidation time is 180min, the sulfide minerals are fully oxidized and wrapped The gold is fully exposed dissociated. The oxidation liquid is separated from solid and liquid. After the liquid is processed, the clarified liquid is returned to the oxidation system for precipitation and recovery; after the oxidation residue is thickened, it enters the next step of cyanidation to extract gold;

[0064] (3) Cyanide gold extraction operation:

[0065] The oxidation slag in step (2) is slurried to a concentration of 25% to 35%; the pH value of the pulp is 11 to 12; the alkali treatment time is 1.5 to 2.5 hours; the ...

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Abstract

The invention discloses a process for extracting gold from carbonaceous gold concentrate. In the invention, an acidic pressure catalytic oxidation (cyanided gold extraction) process is adopted for the fine-disseminated type carbonaceous gold concentrate which is difficult to process; when the process is adopted, sulfide minerals can be oxidized sufficiently, microgranular gold wrapped in the sulfide minerals can be completely disintegrated in an exposed manner, and the adverse effect on cyanidation leaching of the gold, caused by carbon, is also eliminated; the pretreatment process provides favorable conditions for the cyanidation leaching of the gold, the leaching rate of the gold is improved from the conventional 3% to over 97%, and the recovery rate of the gold is obviously increased; and as a soluble medicament is adopted to produce a soluble product, pollution on the environment is greatly reduced, so that gold resources which are difficult to process can be sufficiently utilized.

Description

technical field [0001] The invention relates to a process for extracting gold from refractory gold concentrate, in particular to a process for extracting gold from carbonaceous gold concentrate. Background technique [0002] Gold deposits produced in black (or carbon-bearing) rock series and sedimentary rock series are one of the important types of gold deposits in the world. Since the beginning of this century, the gold industry has recognized the harmful effects of carbonaceous materials in gold ore on cyanidation leaching. From the perspective of gold extraction and smelting, "carbonaceous gold ore" was originally defined as a refractory ore containing organic carbon. The organic carbon in the ore can interact with gold-cyanide complexes, so it cannot be treated by conventional cyanide methods ", belongs to the list of refractory gold mines. The most famous carbonaceous gold mines include the Kalin gold mine in the United States and the Murontao gold mine in Uzbekistan. Q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/00C22B11/08
CPCY02P10/20
Inventor 姚永南郑晔马金瑞赵明福
Owner CHANGCHUN GOLD RES INST
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