Method of crude gold purification

A technology of coarse gold and gold powder, applied in the direction of photography technology, instruments, photography auxiliary technology, etc., can solve the problems of powdering equipment not meeting the requirements, high production and operation costs, and large backlog of gold, etc., to reduce production costs and adaptability. Enhance and save investment

Inactive Publication Date: 2003-09-17
SHANDONG GOLD MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is quite mature at home and abroad, but the method has the following disadvantages: First, the grade of electrolytic gold must reach the national 1# gold, and the grade of anode gold generally reaches more than 99.5%, that is to say, this method is suitable for processing grades of 99.5% For the above crude gold, the crude gold with a grade of less than 99.5% must be pretreated to reach 99.5% before electrolysis; the second is that there is a large backlog of gold in the process of this method
This method can process crude gold of various grades, but because the domestic pulverization equipment cannot meet the required fineness, the equipment can only be imported, and the equipment import needs about 3 million yuan, which is a large investment; in addition, the production and operation costs are relatively high. high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Coarse gold containing 90% gold is cast into an anode plate, and pure gold is used as a cathode, and dilute hydrochloric acid is used as an electrolyte for electrolysis. The electrolyte dilute hydrochloric acid in the above-mentioned electrolyzer is HCl: H 2 O=2:1, the electrolyte dilute hydrochloric acid in the crucible is HCl:H 2 O=1:1. The liquid level in the crucible is 8mm higher than the liquid level in the electrolytic cell. Control the pulsating current to electrochemically dissolve the gold, and the concentration of the gold solution reaches 250 g / L. After filtering, control the solution temperature in the reaction kettle, adjust the pH value of the solution with sodium hydroxide, PH = 0, and reduce it with a reducing agent. It is oxalic acid with a stoichiometric ratio of 1.2 times, and the reaction temperature is 60°C, heated by the precipitation tank. After the reaction is finished, filter and wash to obtain gold powder. The gold content of the sample is...

Embodiment 2

[0022] The crude gold containing 99% gold is cast into an anode plate, a titanium plate is used as a cathode, and dilute hydrochloric acid is used as an electrolyte for electrolysis. The electrolyte dilute hydrochloric acid in the above-mentioned electrolyzer is HCl: H 2 O=1.8:1, the electrolyte dilute hydrochloric acid in the crucible is HCl:H 2 O=1.2:1. The liquid level in the crucible is 10mm higher than the liquid level in the electrolytic cell. Control the pulsating current to electrochemically dissolve the gold, and the concentration of the gold solution reaches 300 g / L. After filtering, control the temperature of the solution in the reaction kettle, adjust the pH value of the solution with sodium hydroxide, PH=1, and reduce it with a reducing agent. It is sodium sulfite with a stoichiometric ratio of 1.1 times, and the reaction temperature is 50°C, heated by the steam jacket outside the reactor. After the reaction is finished, filter and wash to obtain gold powder. ...

Embodiment 3

[0024] Coarse gold containing 85% gold is cast into an anode plate, and pure gold is used as a cathode, and dilute hydrochloric acid is used as an electrolyte for electrolysis. The electrolyte dilute hydrochloric acid in the above-mentioned electrolyzer is HCl: H 2 O=2.5:1, the electrolyte dilute hydrochloric acid in the crucible is HCl:H 2 O=1:1.2. The liquid level in the crucible is 6mm higher than the liquid level in the electrolytic cell. Control the pulsating current to electrochemically dissolve the gold, and the concentration of the gold solution reaches 200 g / L. After filtering, control the temperature of the solution in the reaction kettle, adjust the pH value of the solution with sodium hydroxide, PH=3, and reduce it with a reducing agent. It is 1.3 times the stoichiometric ratio of acetic acid, and the reaction temperature is 55°C. After the reaction is finished, filter and wash to obtain gold powder. Sampling is carried out by fire method to test that the gold ...

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PUM

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Abstract

A process for purifying raw gold whose purity is 85-99.5% includes such steps as electrolysis in which said raw gold is used to make anode plate, pure gold or titanium is used to make cathode, the ceramic crucible is used as the diaphragm of cathode and diluted hydrochloric acid is uses a electrolyte to conver the raw gold to gold solution, and reducing the gold solution to gold powder No.1. Its advantages are low requirement to raw gold and low cost.

Description

(1) Technical field [0001] The invention relates to a method for purifying crude gold whose grade is less than 99.5%, and belongs to the technical field of gold purification. (2) Background technology [0002] At present, electrolytic purification is generally used in China, and the crude gold is cast into an anode plate, and the gold is dissolved on the anode by the action of an electric current, and the gold is selectively precipitated on the cathode to achieve the purpose of purification. Domestic manufacturers include Chengdu Great Wall Refinery, Inner Mongolia Qiankun Refinery, Shenyang Smelter Comprehensive Recovery Workshop, etc. This method is quite mature at home and abroad, but the method has the following disadvantages: First, the grade of electrolytic gold must reach the national 1# gold, and the grade of anode gold generally reaches more than 99.5%, that is to say, this method is suitable for processing grades of 99.5% For the above crude gold, the crude gold w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C25C1/20C25F3/02C25F5/00
Inventor 陈光辉王德煜
Owner SHANDONG GOLD MINING CO LTD
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