Carbonaceous refractory gold concentrate microwave biological pre-oxidation gold extraction process

A technology for gold extraction by pre-oxidation and refractory gold is applied in the direction of improving process efficiency, which can solve the problems of limited degradation and ineffective leaching of gold, and achieve the effect of improving the leaching rate.

Active Publication Date: 2018-10-09
有研资源环境技术研究院(北京)有限公司
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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 c

Method used

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  • Carbonaceous refractory gold concentrate microwave biological pre-oxidation gold extraction process

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Effect test

Embodiment 1

[0031] A carbonaceous refractory gold concentrate in Guizhou contains Au 16.78g / t, S 35.85%, As 1.47%, total carbon 2.42%, organic carbon 2.08%, gold leaching rate of direct cyanide carbon leaching of gold concentrate is 10.24%, After biological preoxidation, the leaching rate of cyanide carbon leaching gold was 80.18%. This refractory gold concentrate is processed as follows by utilizing the technique of the present invention:

[0032] (1) Gold concentrate grinding

[0033] A carbonaceous refractory gold concentrate in Guizhou was ground to make regrind gold concentrate with a grinding particle size of -0.037mm90%.

[0034] (2) Microwave pretreatment of gold concentrate

[0035] The reground gold concentrate was mixed with 12% CaO, and treated at 1KW, 600°C for 15 minutes, and the degradation rate of organic carbon was 73.25%.

[0036] (3) Biological pre-oxidation of gold concentrate

[0037] After microwave treatment, the gold concentrate was adjusted to a concentration ...

Embodiment 2

[0045]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 leaching rate of cyanide carbon leaching gold after biological pre-oxidation was 81.09%. This refractory gold concentrate is processed as follows by utilizing the technique of the present invention:

[0046] (1) Gold concentrate grinding

[0047] Grind a carbonaceous refractory gold concentrate in Guizhou to -0.037mm 95%.

[0048] (2) Microwave pretreatment of gold concentrate

[0049] The carbonaceous refractory gold concentrate after grinding was mixed with 15% NaOH, and treated at 1KW, 600°C for 20min, and the organic carbon degradation rate was 82.15%.

[0050] (3) Biological pre-oxidation of gold concentrate

[0051] After microwave treatment, the gold concentrate was adjusted to a concentration of 15%, and 15% (v...

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Abstract

The invention relates to a carbonaceous refractory gold concentrate microwave biological pre-oxidation gold extraction process, and belongs to the technical field of gold smelting. According to the process, the organic carbon in carbonaceous refractory gold ore is degraded through microwave, the partially coated sulfide is oxidized, and the remaining gold-coated sulfide is opened through biological pre-oxidation. According to the present invention, with the microwave pretreatment process, the gold robbing effect of the gold robbing carbon at the cyanidation leaching stage can be eliminated, the coated sulfide can be activated, the biological pre-oxidation time can be shortened, and the refractory gold ore can be efficiently leached.

Description

technical field [0001] The invention belongs to the technical field of gold smelting, and relates to a microwave biological preoxidation gold extraction process of carbonaceous refractory gold concentrate. Background technique [0002] At present, the pre-oxidation technologies of refractory gold ores mainly include three large-scale technologies such as biological pre-oxidation, roasting pre-oxidation, and pressurized pre-oxidation. Among them, the biological pre-oxidation technology has low cost and environmental friendliness. is receiving increasing attention. 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. Contents of the invention [0003] The purpose of the present invention is to provide a carbonaceous refra...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B11/02C22B3/18
CPCC22B3/18C22B11/02C22B11/04Y02P10/20
Inventor 陈勃伟温建康宋永胜武彪尚鹤陈勇蔡镠璐周成英屈伟
Owner 有研资源环境技术研究院(北京)有限公司
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