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Process for recycling high-purity gold from anode slime through organic reduction method

A technology of anode slime and reduction method, which is applied in the field of wet smelting production, can solve the problems of large consumption of aqua regia and hydrochloric acid solution, large production investment, etc., and achieve the effect of eliminating electrolysis process, saving production cost, and fast capital turnover

Inactive Publication Date: 2016-01-27
HUNAN JINWANG BISMUTH
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Problems solved by technology

However, the consumption of aqua regia and hydrochloric acid solution is large, and the production investment is still relatively large

Method used

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  • Process for recycling high-purity gold from anode slime through organic reduction method

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Embodiment Construction

[0015] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] attached figure 1 Representing an organic reduction method to recover high-purity gold process steps from anode slime is:

[0017] ①Acid leaching to remove impurities

[0018] Before using aqua regia for gold, carry out acid leaching to remove impurities, leaching the anode slime with boiling nitric acid, and control the liquid-solid volume mass ratio of 10:1L / kg; let part of the oxides, hydroxides and soluble salts in the anode slime enter solution; avoid impurities entering the solution during the aqua regia gold process; filter and dry the nitric acid insoluble residue, and recover silver from the nitric acid washing solution;

[0019] ②Aqua regia soluble gold

[0020] Add aqua regia to the nitric acid insoluble slag, control the liquid-solid volume mass ratio 6:1L / kg; heat, and under the condition of 100 ℃, the gold in the an...

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Abstract

The invention relates to a process for recycling high-purity gold from anode slime through an organic reduction method and belongs to the technical field of wet-method smelting production. The process includes the following steps that firstly, the anode slime is soaked in and washed through boiled nitric acid so as to remove impurities; secondly, residues insoluble in the nitric acid is dissolved through aqua regia to dissolve gold; thirdly, a gold-contained aqua regia solution is reduced through oxalic acid; and fourthly, leached residues are washed through water, pickled and washed through water again, so that a finished gold product meeting the international IG-Au of over 99.99%. By the adoption of the method, a traditional process for extracting gold through an oxalic acid reduction method is improved, the quality of the finished gold product is greatly improved, an electrolysis process and refinement performed after the traditional process are omitted, a production period is shortened, and production cost is saved.

Description

technical field [0001] The invention relates to a process for recovering high-purity gold from anode slime by an organic reduction method, and belongs to the technical field of hydrometallurgy production. Background technique [0002] With the development of science and technology, the use of gold has become wider and wider, and the consumption has increased, which has promoted the continuous development of gold dressing and smelting technology, and a revolution has occurred in the gold extraction process. The methods for recovering gold from electrolytic anode slime of non-ferrous heavy metals include: oxalic acid reduction method, nitric acid oxidation method, aqua regia method, and electrolysis method. The purity of gold recovered by the oxalic acid reduction method and the nitric acid oxidation method is not high, and the comprehensive recovery level of precious metals is not high; although the aqua regia method can produce high-quality gold products, the production proc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B7/00
CPCY02P10/20
Inventor 李畅肖辉王志雄吴祖祥周贱华
Owner HUNAN JINWANG BISMUTH
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