Reinforced leaching method of fine-grained encapsulated gold

A technology for strengthening leaching and wrapping gold, applied in the direction of improving process efficiency, can solve the problems of difficult to achieve recovery, difficult to recover by cyanidation, and achieve the effect of convenient operation, high gold leaching rate, and enhanced leaching.

Active Publication Date: 2015-06-10
SHENZHEN RUICHENG SHIDAI IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the defects in the gold extraction process in the prior art from waste residues such as cyanide slag, sulfuric acid slag, and gold-containing sulfide ore calcine, such as the gold particle size is very small, mostly below 0.01 mm, and it is extremely fine micro-bit gold, At the same time, most of them are insoluble wrapped gold, which is difficult to continue to reclaim with cyanidation, and it is also difficult to achie

Method used

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  • Reinforced leaching method of fine-grained encapsulated gold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The cyanide slag is taken from a gold mine in Yueyang, Hunan, containing 12.8g / t of gold, and the fineness is -0.074mm, accounting for 70.5%. Take 1000 parts of cyanide slag, 1.5 parts of golden cicada medicine, 0.3 part of oxidant calcium peroxide, 0.1 part of organic dispersant Pingpingjiao, 0.1 part of inorganic dispersant sodium hexametaphosphate, 4.0 parts of lime, and 2000 parts of water into the stirring mill , the grinding medium is 2mm steel balls, and the grinding time is 60 minutes. As measured by the laser particle size analyzer, the particle size distribution of the pulp is between 0.5 μm and 20 μm, and d(50)=3.35 μm.

[0046] Put the ground pulp into a high-pressure reaction kettle, add 1000 parts of water, 1.0 parts of Jinchan medicine, 1.5 parts of lime (pH value of the pulp = 11.5), 0.2 parts of oxidant calcium peroxide, and start stirring; Unicom air compressor, put The reaction kettle was pressurized to 0.4MPa (gauge pressure), and the reaction was s...

Embodiment 2

[0049] The cyanide slag is taken from a gold mine in Yueyang, Hunan, containing 12.8g / t of gold, and the fineness is -0.074mm, accounting for 70.5%. Take 1000 parts of cyanide slag, 1.5 parts of sodium cyanide, 0.3 part of oxidant potassium ferricyanide, 0.2 part of organic dispersant P-5040 (commercially available, a kind of modified polyacrylate), 3.5 parts of sodium hydroxide, water Add 1000 parts to the stirring mill, the grinding medium is 2mm steel balls, and grind for 30 minutes. As measured by the laser particle size analyzer, the particle size distribution of the pulp is between 0.5 μm and 36 μm, and d(50)=10.98 μm.

[0050] Put the ground pulp into a high-pressure reactor, add 1000 parts of water, 1.0 parts of sodium cyanide, 1.2 parts of sodium hydroxide (pH value of the pulp = 10.5), 0.2 parts of potassium ferricyanide, and start stirring; Unicom air compressor , pressurize the reactor to 0.6MPa (gauge pressure), set the temperature of the reactor to 80°C; stir an...

Embodiment 3

[0052] The cyanide slag is taken from a gold mine in Zhaoyuan, Shandong, with a gold content of 3.8g / t and a fineness of -0.074mm, accounting for 80.6%. Take 1000 parts of cyanide slag, 1.0 part of golden cicada medicine, 0.10 part of oxidant hydrogen peroxide, 0.5 part of dispersant sodium hexametaphosphate, 2.0 parts of ammonia water, and 1000 parts of water and add them to the stirring mill. The grinding medium is 2 mm steel balls, and grind for 60 minutes. As measured by the laser particle size analyzer, the particle size distribution of the pulp is between 0.5 μm and 15 μm, and d(50)=1.39 μm.

[0053] Transfer the ground pulp into a high-pressure reactor, add 2500 parts of water, 0.5 parts of Jinchan medicine, 1.5 parts of lime (pH value of the pulp = 12.0), 0.2 parts of oxidant hydrogen peroxide, and start stirring; Pressurize to 1.1 MPa (gauge pressure), stir and react at 40° C. for 12 hours; stop the reaction, filter to obtain leaching liquid and leaching residue. Aft...

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Abstract

The invention discloses a reinforced leaching method of fine-grained encapsulated gold, which comprises the following steps: adding cyanation slag, calcined pyrite, pyrite cinder, auriferous sulfide ore roasted product or any other auriferous material, a gold leaching agent, a pH regulator, an oxidizer, a dispersing agent and the like into a water-base solvent, carrying out ball milling leaching to obtain extra-fine ground leaching slurry, transferring the extra-fine ground leaching slurry into a high-pressure reaction kettle, supplementing the gold leaching agent, oxidizer and water-base solvent, introducing air or oxygen-enriched air, carrying out pressure leaching, filtering and separating to obtain an auriferous pregnant solution and leaching slag. The method is simple in and convenient to operate, and can implement high-efficiency leaching of the fine-grained encapsulated gold; the obtained pregnant solution can be subjected to the existing technique composed of activated carbon adsorption, desorption, electrolysis, zinc powder (wire) reduction and the like to recover gold; and the method has high applicability and obvious economic benefits.

Description

technical field [0001] The invention relates to an intensified leaching method for fine-grained wrapped gold, which belongs to the technical field of wet gold leaching. Background technique [0002] Cyanide slag, also known as cyanide tailings, is the CN - The leaching waste residue obtained by pressure filtration after complex leaching. As far as the gold leaching process is concerned, there are thiosulfate method, sulfur urine method, lime sulfur mixture method, bromination method, chlorination method, iodination method, cyanide method, cyanide-like method, etc. Because of its mature technology, low cost, high recovery rate, strong adaptability to ore, and the ability to produce gold on site, the method still has a dominant position in the current gold extraction industry after a hundred years. For easy-to-handle gold ore, cyanide is the first choice. Gold extraction method, even refractory ores, after strong oxidation pretreatment, can still use cyanidation method to ex...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/04
CPCY02P10/20
Inventor 符剑刚
Owner SHENZHEN RUICHENG SHIDAI IND CO LTD
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