Pressurization, water immersion and oxidation preprocessing cyaniding gold extraction method for difficult-processing gold concentrates

A technology for refractory gold and pressurized water, applied in the field of metallurgy, can solve the problems that the manufacturing process and control technology level of the pressurized oxidation equipment cannot meet the requirements, and achieve the effect of reducing the process cost.

Inactive Publication Date: 2013-02-13
YUNNAN GOLD MINING GRP
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Problems solved by technology

On the other hand, the temperature and pressure control points of this technology are different from those of the above-mentioned patents. This technology requires higher temperature and pressure, so a higher leaching rate of gold concentrate can be obtained, reaching more than 96%, and the economic benefits are obvious The reason why the temperature and pressure control of the previous technology is relatively low is that the manufacturing process and control technology level of the pressurized oxidation equipment are not up to the requirements, and these technologies are relatively mature at present

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  • Pressurization, water immersion and oxidation preprocessing cyaniding gold extraction method for difficult-processing gold concentrates

Examples

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Embodiment 1

[0029] Example 1: The raw gold concentrate comes from a mine of Yunnan Gold Mining Group Co., Ltd. According to mineral analysis, the gold concentrate is a high-sulfur concentrate with a sulfur content of 38.28%. The main chemical composition analysis is shown in Table 1. Ball mill the raw gold concentrate to -0.074mm>90%, add sodium lignosulfonate 2‰, mix water with a liquid-solid ratio of 3:1, under the conditions of a temperature of 130°C, an oxygen partial pressure of 0.6MPa, and a stirring speed of 500rpm , pressurize the ore pulp for 3 hours in the reaction kettle to obtain oxidation slag, the oxidation slag is filtered and washed, mixed with water at a liquid-solid ratio of 2:1, added lime to adjust the slurry to pH = 11, and added potassium cyanide 5‰, The reaction time is 18 hours for cyanidation to extract gold, the precious metal enrichment enters the precious liquid, and the cyanide slag is processed in the next step. The gold content of the precious liquid is 0.0...

Embodiment 2

[0030] Example 2: The raw gold concentrate is a high-sulfur concentrate with a sulfur content of 37.47%. The analysis of its main chemical components is shown in Table 2. The raw gold concentrate is ball-milled to -0.045mm>90%, and sodium lignosulfonate is added at 2‰, and the slurry is mixed with water at a liquid-solid ratio of 6:1. At a temperature of 200°C, oxygen Under the conditions of pressure 1MPa and stirring speed 200rpm, oxidize the ore pulp in the reactor for 4 hours under pressure to obtain oxidized slag, the precious metals are left in the slag, the oxidized slag is filtered and washed, mixed with water at a liquid-solid ratio of 3:1, and added lime Mix slurry to pH=12, add sodium cyanide 2‰, and carry out cyanidation gold extraction after 48 hours of reaction time, the precious metal enrichment enters the solution, and the gold content of the precious solution is 0.015g / L, and the cyanide slag is piled up after being filtered and washed, and the gold The leach...

Embodiment 3

[0031] Example 3: The raw gold concentrate is a high-sulfur arsenic concentrate with a sulfur content of 23.06% and an arsenic content of 5.33%. The main chemical composition analysis of the gold concentrate is shown in Table 3. The raw gold concentrate was ball-milled to a particle size of -0.074mm>80%, and sodium lignosulfonate was added at 2‰, and the slurry was mixed with water at a liquid-solid ratio of 10:1. ℃, oxygen partial pressure 2MPa, stirring speed 450rpm, pressurized oxidation of the ore slurry in the reactor for 5 hours to obtain oxidation slag; the oxidation slag was filtered and washed, mixed with water at a liquid-solid ratio of 5:1, and added lime to adjust the slurry To pH = 12, add sodium cyanide 3‰, the reaction time is 72h to carry out cyanidation gold extraction, the precious metal is enriched into the solution, and the gold content of the precious solution is 0.021g / L. The cyanide slag was stored after being filtered and washed, and the gold leaching...

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Abstract

The invention relates to a pressurization, water immersion and oxidation preprocessing cyaniding gold extraction method for difficult-processing gold concentrates, which aims at the gold concentrates with higher sulfur-containing, mainly containing iron pyrite, concomitant with copper pyrite, zinc blende and the like, and comprises the following steps: performing ball-milling on the raw material gold concentrates, performing size mixing, cyaniding for gold extraction after pressurization, water immersion and oxidation preprocessing to obtain a pregnant solution with gold-containing of 0.010 g/L-0.040 g/L, and the gold cyanide leaching rate reaches 96% of a smelting indicator. In the invention, the initial media are neutral, an acid or alkali reagent is not needed, and only the neutral additive lignosulphonate is needed, so that the process cost is reduced, and the extremely high gold recovery rate is realized at the same time.

Description

technical field [0001] The invention relates to a method for cyanide gold extraction of refractory gold concentrate by pressurized water immersion oxidation pretreatment, especially suitable for cyanide gold extraction of gold concentrate with chalcopyrite, sphalerite, etc. The method belongs to the technical field of metallurgy. Background technique [0002] With the continuous mining of gold ore, easily-disposable gold ore is gradually scarce. About 30% of my country's proven geological reserves are refractory gold ore resources. As a big gold-producing country, how to efficiently develop refractory gold mines has become a technical problem that we must face. The main reason why this type of gold ore is difficult to treat is that the sulfide such as arsenopyrite and pyrite wraps gold, which hinders the direct contact between gold and cyanide, resulting in a very low leaching rate of direct gold cyanide. With the conventional cyanide gold extraction process, the gold leac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08C22B3/04
CPCY02P10/20
Inventor 陈奕然李奇伟陈明军葛云松
Owner YUNNAN GOLD MINING GRP
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