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A kind of crude gold purification method

A crude gold and immersion gold technology, which is applied in the field of crude gold purification, can solve problems such as low product recovery, high impurity content, and difficult production management, and achieve simple and easy-to-operate production processes, reduce production costs, and reduce production management difficulties. Effect

Active Publication Date: 2019-10-18
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional chemical reduction method is used to purify crude gold, the impurity content is high, the product recovery rate is low, and production management is difficult. Further improvement of the reduction and purification process is required.

Method used

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  • A kind of crude gold purification method

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Experimental program
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Effect test

Embodiment 1

[0031] A method for purifying crude gold, the crude gold raw materials used are composed of Au 75-99.5wt%, Ag 0.01-22.5wt%, Cu 0.01-16wt%, Pb 0.01-0.6wt%, Bi 0.01-0.01wt%, and the rest for other impurities.

[0032] 1) Aqua regia dissolution: put crude gold in a container, slowly add aqua regia, the amount of aqua regia is 2L / kg crude gold, stir to dissolve the crude gold, the dissolution rate is slow during the dissolution process, heat to 50°C to accelerate the dissolution, wait for After the crude gold is dissolved, cool and stand for 1 hour, filter and separate to obtain the filtrate and filter residue, repeat the gold dissolution after the filter residue is collected, and the filtrate enters the next reaction step;

[0033] 2) Silver and lead removal: add distilled water to the obtained filtrate according to the volume ratio of 1:3, dilute and remove silver, and then add Na 2 SO 4 Powder lead removal, Na 2 SO 4 The amount of powder added is 1 times the mass content of...

Embodiment 2

[0040] A method for purifying crude gold, the crude gold raw materials used are composed of 89wt% Au, 0.4wt% Ag, 0.02wt% Cu, 0.25wt% Pb, 0.04wt% Bi, and the rest are other impurities.

[0041] 1) Aqua regia dissolution: put crude gold in a container, slowly add aqua regia, the amount of aqua regia is 2.5L / kg crude gold, stir to dissolve crude gold, the dissolution rate is slow during the dissolution process, heat to 60°C to accelerate the dissolution, After the dissolution of the crude gold is completed, cool and stand for 2 hours, filter and separate to obtain the filtrate and filter residue, and repeat the gold dissolution after the filter residue is collected, and the filtrate enters the next reaction step;

[0042] 2) Remove silver and lead: add distilled water to the obtained filtrate according to the volume ratio of 1:4, dilute and remove silver, and then add Na 2 SO 4 Powder lead removal, Na 2 SO 4 The amount of powder added is twice the mass content of lead in the c...

Embodiment 3

[0049] A method for purifying crude gold, the crude gold raw materials used are composed of Au 93.5wt%, Ag 0.4wt%, Cu 0.06wt%, Pb 0.03wt%, Bi 0.07wt%, and the rest are other impurities.

[0050] 1) Aqua regia dissolution: put crude gold in a container, slowly add aqua regia, the amount of aqua regia is 2.8L / kg crude gold, stir to dissolve the crude gold, the dissolution rate is slow during the dissolution process, heat to 40°C to accelerate the dissolution, After the crude gold is completely dissolved, cool and stand for 0.5h, filter and separate to obtain the filtrate and filter residue, repeat the gold dissolution after the filter residue is collected, and the filtrate enters the next reaction step;

[0051] 2) Remove silver and lead: add distilled water to the obtained filtrate according to the volume ratio of 1:4, dilute and remove silver, and then add Na 2 SO 4 Powder lead removal, Na 2 SO 4 The amount of powder added is 3 times of the lead mass content in the crude go...

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Abstract

The invention belongs to the technical field of raw gold purification and particularly relates to a method for purifying raw gold. The raw gold is purified by the technologies of dissolving the raw cold by aqua regia, removing silver by diluting with distilled water, removing lead by Na2SO4, immersing gold by Na2SO3 reduction, removing impurities by an EDTA (Ethylene Diamine Tetraacetic Acid) solution, carrying out fusion casting in a muffle furnace, washing with dilute acid and the like. The method for purifying the raw gold has the advantages of simple process flow, high adaptability of rawmaterials, short production cycle of only about 10 hours, simple process and convenience in operation; the recovery rate of the gold reaches 99.4 percent or above; a gold ingot with the purity of 99.99 percent is finally prepared; the method facilitates large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of crude gold purification, and in particular relates to a crude gold purification method. Background technique [0002] Gold purification processes mainly include electrolysis, solvent extraction and chemical reduction. At present, most gold enterprises at home and abroad use electrolysis to produce high-purity gold, but electrolysis has relatively high requirements on raw materials, and raw materials with gold content <99.95% are not suitable for high-purity gold production by electrolysis. In addition, the electrolysis method has disadvantages such as long production cycle, poor operating conditions and large gold backlog. The high-purity gold produced by solvent extraction is easy to wrap organic solvents, which affects the purity of gold. In addition, the extraction agent is extremely volatile, the production environment is poor, and there are potential safety hazards in the operation process, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/06C22B3/44C22B7/00
CPCY02P10/20
Inventor 李衍林张梅代龙果罗恒吴红林裴启飞李建伟张候文徐刚王瑞山候刚刘德国罗凌艳余秋雁杨春玉张萃田维唯肖明金
Owner YUNNAN CHIHONG ZINC & GERMANIUM