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Golden shifting process of biological oxidation-torrefaction-cyanidation

A bio-oxidation and roasting technology, applied in the direction of improving process efficiency, can solve problems such as inability to effectively recover gold, and achieve the effect of improving leaching rate and reducing pollution

Active Publication Date: 2010-12-08
CHANGCHUN GOLD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The remarkable feature of micro-disseminated carbonaceous refractory gold ore is that gold exists in pyrite or arsenopyrite in the form of fine particles and packages, and contains elements such as arsenic, sulfur, and organic carbon that are not conducive to leaching. Traditional cyanide leaching cannot recover gold effectively

Method used

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  • Golden shifting process of biological oxidation-torrefaction-cyanidation
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  • Golden shifting process of biological oxidation-torrefaction-cyanidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] (1) Grinding and grading operations:

[0095]Grind the above-mentioned refractory gold concentrate until the particle size is -0.045mm and the content is 95%, and then carry out dense drug removal and adjust the pulp concentration to 16%;

[0096] (2) Biological oxidation operation:

[0097] Feed the ore pulp with a pulp concentration of 16% in step (1) into the biological oxidation system, and ensure that the pH is 1-2; the temperature is 40°C; the dissolved oxygen content is 4mg / l; the medium consumption is 4kg / t; the oxidation time is 7 days Under the process conditions, the biological oxidation operation is carried out. After the oxidized oxidation washing liquid undergoes primary neutralization and secondary neutralization to remove arsenic, solid-liquid separation is carried out, the neutralization slag is discharged, the neutralization liquid is returned to the washing system, and the oxidation slag is re- After pressure filtration, drying and pulverization, ent...

Embodiment 2

[0108] (1) Grinding and grading operations:

[0109] Grind the above-mentioned refractory gold concentrate until the particle size is -0.045mm and the content is 95%, and then carry out dense drug removal and adjust the pulp concentration to 18%;

[0110] (2) Biological oxidation operation:

[0111] Feed the pulp with a pulp concentration of 18% in step (1) into the biological oxidation system, and ensure that the pH is 1-2; the temperature is 38°C; the dissolved oxygen content is 4mg / l; the medium consumption is 3kg / t; the oxidation time is 7 days Under the process conditions, the biological oxidation operation is carried out. After the oxidized oxidation washing liquid undergoes primary neutralization and secondary neutralization to remove arsenic, solid-liquid separation is carried out, the neutralization slag is discharged, the neutralization liquid is returned to the washing system, and the oxidation slag is re- After pressure filtration, drying and pulverization, enter ...

Embodiment 3

[0122] (1) Grinding and grading operations:

[0123] Grind the above-mentioned refractory gold concentrate until the particle size is -0.045mm and the content is 95%, and then carry out dense drug removal and adjust the pulp concentration to 16%;

[0124] (2) Biological oxidation operation:

[0125] Feed the pulp with a pulp concentration of 16% in step (1) into the biological oxidation system, and ensure pH = 1-2; the temperature is 42°C; the dissolved oxygen content is 5mg / l; the medium consumption is 4kg / t; the oxidation time is 8 days Under the process conditions, the biological oxidation operation is carried out. After the oxidized oxidation washing liquid undergoes primary neutralization and secondary neutralization to remove arsenic, solid-liquid separation is carried out, the neutralization slag is discharged, the neutralization liquid is returned to the washing system, and the oxidation slag is re- After pressure filtration, drying and pulverization, enter the next s...

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Abstract

The invention relates to a biologic oxidation-roasting-cyanide gold leaching process, which belongs to metallurgical technologies. The technology proposal combines the biologic oxidation technology and the low-temperature roasting technology; the biologic oxidation process is utilized to lead wrapped fine particle gold to be exposed and dissociated fully; then oxidation sludge is processed through low-temperature roasting to remove organic carbon in ores, thereby thoroughly solving the adsorption and preg-robbing problems in subsequent cyanidation operation, and preventing low melting point oxides from secondarily wrapping the gold; the organic combination of the two pretreatment processes provides advantages for the cyaniding leaching of the gold. The biologic oxidation-roasting-cyanide gold leaching process has the advantages that firstly, the leaching rate of the gold is increased to 95.82 percent compared with the conventional leaching rate that is 0.66 percent, so that the leaching rate of the gold is increased obviously; secondly, the environmental pollution is reduced greatly.

Description

technical field [0001] The invention relates to a gold extraction process of refractory gold concentrate, in particular to a biological oxidation-roasting-cyanidation gold extraction process. Background technique [0002] As we all know, with the rapid development of the gold industry, the easy-to-extract gold ore resources are increasingly exhausted, and the refractory gold ore resources have become the main raw materials for the gold industry in the future, among which finely disseminated carbonaceous refractory gold ore is one of them; [0003] The remarkable feature of the micro-disseminated carbonaceous refractory gold ore is that gold exists in pyrite or arsenopyrite in the form of fine particles and packages, and contains elements such as arsenic, sulfur, and organic carbon that are not conducive to leaching. Traditional cyanide leaching cannot effectively recover the gold therein. [0004] The current pretreatment methods for refractory gold ores mainly include oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/08C22B3/18C22B1/02
CPCY02P10/20
Inventor 赵俊蔚郑晔高金昌巩春龙王海东
Owner CHANGCHUN GOLD RES INST
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