Re-leaching process for carbon refractory gold concentrate cyanide tailings

A technology for cyaniding tailings and refractory gold, applied in the direction of improving process efficiency, etc., can solve the problems of limited degradation, residue, and ineffective leaching of gold

Inactive Publication Date: 2018-07-03
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, for carbonaceous refractory gold ores containing organic carbon, the existing biological pre-oxidation system has limited degradation of organic carbon. Due to the existence of "gold-robbing carbon" in the cyanidation leaching process, part of the gold often cannot be effectively decomposed. Leach out, remain in cyanide residue

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  • Re-leaching process for carbon refractory gold concentrate cyanide tailings

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Embodiment 1

[0017] A carbonaceous refractory gold concentrate in Guizhou, containing Au 16.78g / t, S 35.85%, As 1.47%, total carbon 2.42%, organic carbon 2.08%, direct cyanide carbon leaching gold leaching rate of gold concentrate is 10.24% , the cyanide carbon leaching gold leaching rate after biological pre-oxidation was 80.18%, and the gold content in cyanide tailings was 3.48g / t.

[0018] The cyanide tailings were slurried with water to form a solution with a liquid-solid ratio of 4:1, 10% CaO and 20g / L coconut shell activated carbon were added, and after leaching at 90°C for 8 hours, the leached residue contained 1.42g / t of gold , The leaching rate of gold in leaching slag is 59.20%, the rate of gold leaching in gold concentrate is 92.03%, and the rate of gold leaching is increased by 11.85%.

Embodiment 2

[0020] A carbonaceous refractory gold concentrate in Guizhou, containing 28.40g / t of Au, 21.36% of S, 1.93% of As, 3.18% of total carbon, 1.85% of organic carbon, and the direct cyanidation carbon leaching gold leaching rate of gold concentrate is 1.22% , the gold leaching rate of cyanide carbon leaching after biological pre-oxidation was 81.09%, and the gold content in cyanide tailings was 7.16g / t.

[0021] The cyanide tailings were slurried with water to form a solution with a liquid-solid ratio of 3:1, 5% CaO and 20g / L coconut shell activated carbon were added, and after leaching at 70°C for 6 hours, the leached residue contained 3.06g / t of gold , The leaching rate of gold in leaching slag is 57.26%, the rate of gold leaching in gold concentrate is 91.69%, and the rate of gold leaching is increased by 10.60%.

[0022] It can be seen that, through the above-mentioned technical scheme, the present invention can leach more than 50% of the gold through the releaching of the cya...

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Abstract

The invention discloses a re-leaching process for carbon refractory gold concentrate cyanide tailings. The process specifically comprises the following steps: performing size mixing on cyanide tailings to obtain a solution with a liquid-solid ratio of 2:1 to 5:1, adding a leaching agent and cocoanut active charcoal into the solution, and heating and leaching. According to the process disclosed bythe invention, by virtue of re-leaching of the carbon refractory gold concentrate cyanide tailings, the organic carbon can be degraded, sulfides are subjected to oxidized coating, gold in the cyanidetailings is effectively leached out, the gold in the cyanide tailings can be leached out by 50% or higher, and the leaching rate of gold concentrate is improved by 10% or higher, so that the gold in the cyanide tailings is recycled.

Description

technical field [0001] The invention relates to a releaching process of carbonaceous refractory gold concentrate cyanide tailings, belonging to the technical field of gold smelting. Background technique [0002] At present, the pre-oxidation technologies for refractory gold ores mainly include three large-scale technologies: biological pre-oxidation, roasting pre-oxidation, and pressurized pre-oxidation. Among them, the biological pre-oxidation technology is receiving more and more attention because of its low cost and environmental friendliness. However, for carbonaceous refractory gold ores containing organic carbon, the existing biological pre-oxidation system has limited degradation of organic carbon. Due to the existence of "gold-robbing carbon" in the cyanidation leaching process, part of the gold often cannot be effectively decomposed. Leach out and remain in the cyanide residue. Contents of the invention [0003] The object of the present invention is to provide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B3/04C22B11/00
CPCC22B3/04C22B3/12C22B11/04Y02P10/20
Inventor 陈勃伟温建康宋永胜武彪尚鹤陈勇李文娟蔡镠璐周成英屈伟
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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