Gold extraction process with low pollution and high recovery for refractory gold concentrate

A high-recovery, refractory gold technology, applied in the direction of improving process efficiency, to achieve the effects of reducing pollution, being environmentally friendly, and easy to automate control

Active Publication Date: 2008-10-15
CHANGCHUN GOLD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-pollution and high-recovery refractory gold concentrate gold extraction process, which not only solves the oxidation problem of sulfide and carbon substances; but also fully exposes and dissociates gold, making most of the sulfur and arsenic After being oxidized, it enters the liquid phase, which completely solves the problem of gold adsorption in the subsequent cyanidation operation; this process improves the recovery rate of gold, reduces environmental pollution, and is easy to be automatically controlled, so that this part of refractory gold resources can be fully utilized

Method used

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  • Gold extraction process with low pollution and high recovery for refractory gold concentrate
  • Gold extraction process with low pollution and high recovery for refractory gold concentrate
  • Gold extraction process with low pollution and high recovery for refractory gold concentrate

Examples

Experimental program
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Effect test

Embodiment 1

[0066] (1) Grinding of gold concentrate and dense drug removal:

[0067] Grind the above-mentioned refractory gold concentrate until the grinding particle size is -0.045mm and the content is 95%, and then carry out dense drug removal and adjust the pulp concentration to 16%;

[0068] (2) Biological oxidation:

[0069] Feed the ore pulp with a certain concentration adjusted in step (1) into the biological oxidation system. Under the process conditions of guaranteed temperature of 40°C, dissolved oxygen amount of 4mg / l, medium dosage of 4kg / t, and oxidation time of 8 days, microorganisms can oxidize, decompose and vulcanize Minerals, so that gold is fully exposed and dissociated. After biological oxidation, the oxidized washing liquid undergoes primary neutralization and secondary neutralization to remove arsenic, separates solids and liquids, discharges neutralized slag, and returns the neutralized liquid to wash, then press filter and dry Powdered into oxide slag, enter the n...

Embodiment 2

[0079] (1) Grinding of gold concentrate and dense drug removal:

[0080] Grind the above refractory gold ore until the grinding particle size is -0.045mm and the content is 95%, and then carry out dense drug removal and adjust the pulp concentration to 16%;

[0081] (2) Biological oxidation:

[0082] Feed the ore pulp with a certain concentration adjusted in step (1) into the biological oxidation system. Under the process conditions of guaranteed temperature of 40°C, dissolved oxygen amount of 5mg / l, medium dosage of 4kg / t, and oxidation time of 7 days, microorganisms can oxidize, decompose and vulcanize Minerals, so that gold is fully exposed and dissociated, after biological oxidation, the oxidized washing liquid undergoes primary neutralization and secondary neutralization to remove arsenic, separates solids and liquids, discharges neutralized slag, and returns the neutralized liquid to wash, then press filter and dry Powdered into oxide slag, enter the next step of microw...

Embodiment 3

[0092] (1) Grinding of gold concentrate and dense drug removal:

[0093] Grind the above refractory gold ore until the grinding particle size is -0.045mm and the content is 95%, and then carry out dense drug removal and adjust the pulp concentration to 16%;

[0094] (2) Biological oxidation:

[0095] Feed the ore pulp with a certain concentration adjusted in step (1) into the biological oxidation system. Under the process conditions of guaranteed temperature 38°C, dissolved oxygen amount 5mg / l, medium consumption 4kg / t, and oxidation time 8 days, microorganisms oxidize, decompose and vulcanize Minerals, so that gold is fully exposed and dissociated, after biological oxidation, the oxidized washing liquid undergoes primary neutralization and secondary neutralization to remove arsenic, separates solids and liquids, discharges neutralized slag, and returns the neutralized liquid to wash, then press filter and dry Powdered into oxide slag, enter the next step of microwave radiati...

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Abstract

The invention relates to a process for extracting gold of refractory gold concentrates with low pollution and high recovery rate, belonging to the metallurgical process class. The process proposal which combines organically the bacterial oxidation technology with the microwave irradiation technology comprises the following steps of: oxidizing and decomposing sulfide minerals by means of the bacterial oxidation technology first; exposing and dissociating sufficiently the gold; oxidizing a large part of sulfur and arsenic to enter a liquid-phase; carrying out the neutralization treatment to the oxidizing liquid and returning to use; roasting oxidizing slag with microwave at the low temperature; and removing organic carbon in ore. The process solves completely the problem of absorbing the gold in the subsequent cyaniding gold extraction work. The process has high recovery rate of the gold and less environment pollution, is easy to automatically control and saves energy.

Description

technical field [0001] The invention relates to a process for refractory gold ore, in particular to a process for extracting gold from refractory gold concentrate with low pollution and high recovery rate. Background technique [0002] As we all know, with the rapid development of the gold industry, the gold ore resources that are easy to be directly extracted by cyanide are gradually exhausted, and the refractory gold ore resources have become the main raw materials for the gold industry in the future. Such ores account for an increasing proportion of the proven gold geological reserves, and are widely distributed in Liao, Hunan, Guangxi, Guizhou, Gansu, Sichuan, Anhui, Jilin and other regions. Its remarkable feature is that gold exists in pyrite or arsenopyrite crystal lattice in the form of fine particles and packages, and contains more elements that interfere with leaching, such as arsenic, sulfur, antimony, organic carbon or other adsorbed gold cyanide complexes. It ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08C22B3/18C22B4/04
CPCY02P10/20
Inventor 郑晔高金昌赵俊蔚巩春龙
Owner CHANGCHUN GOLD RES INST
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