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A method of controlling potential to purify gold

A potential, gold technology, applied in the field of precious metal smelting and purification process, can solve the problems of low gold separation efficiency, inclusions, shortening the gold recovery process, etc., and achieve the effects of stable technical indicators, low production costs, and low labor intensity.

Active Publication Date: 2022-06-07
CENT SOUTH UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] Although the controlled potential chlorination leaching process simplifies the treatment process of noble antimony and shortens the recovery process of gold, the efficiency of gold separation in this treatment process is low, the complete leaching of gold cannot be realized, and the purification of the gold separation solution is not thorough. Lead to silver and lead impurities in the reduced gold powder, affecting the quality of the reduced gold powder

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  • A method of controlling potential to purify gold

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Embodiment 1

[0030] The main components of the crude gold powder produced by a domestic gold smelting enterprise are as a percentage of quality: Au88.2, Ag9.0, Cu0.5, Sb1.2, Pb1.2 and Ni0.1. Hydrochloric acid, hydrogen peroxide, sodium chlorate, sodium hydroxide, sodium sulfate, sodium sulfite, nitric acid are all pure reagents for analysis, the mass percentage concentration of hydrochloric acid is not less than 36.0%, the mass percentage concentration of hydrogen peroxide is not less than 30.0%, the mass percentage content of sodium chlorate is not less than 98.0%, the mass percentage content of sodium hydroxide is not less than 96.0%, the mass percentage content of sodium sulfate is not less than 97.0%, the mass percentage content of sodium sulfite is not less than 97.0%, and the mass percentage concentration of nitric acid is not less than 63.0%.

[0031] Preparation of molar concentration of 4mol / L hydrochloric acid solution, according to the liquid-solid ratio (solution volume L and raw...

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Abstract

A method for purifying gold with controlled potential, adding hydrogen peroxide and sodium chlorate to crude gold powder successively in hydrochloric acid solution for potential controlled chlorination to separate gold, so that gold dissolves into the solution in the form of chloroauric acid; Sodium sulfate and sodium hydroxide adjust the pH value. When the solution is cooled, silver and lead precipitate; The gold powder is washed sequentially with pure water, ammonia solution, nitric acid solution and pure water to remove impurities. The essence of the present invention is to realize the purification of gold in coarse gold powder by using the methods of controlling potential chlorination to separate gold, neutralizing and cooling to remove impurities, controlling potential to reduce impurities, and multi-stage washing and removing impurities. These processes together realize the expected purification of gold in coarse gold powder Effect.

Description

Technical field [0001] The present invention relates to a hydrometallurgical process in the precious metal smelting and purification process, in particular a hydrometallurgical method using a potentiometric method to efficiently purify gold from crude gold powder. Background [0002] Gold is a scarce strategic metal, widely used in gold jewelry, currency reserves and high-tech industries, as of now, the application of gold in jewelry and currency reserves two major areas still occupies a major position. Ever since humans discovered and began to use gold, they have been constantly researching and exploring efficient ways to purify gold. From the earliest washing of gold sand, to the later mercury amalgamation method of gold extraction, to the cyanidation method that appeared more than 100 years ago, to the emergence of various types of thiosulfate gold immersion method, thiourea impregnation method, etc., human exploration of gold smelting and purification process is constantly pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B11/06
CPCC22B11/04C22B11/06Y02P10/20
Inventor 刘伟锋孙百奇张杜超陈霖杨天足胡晓丽
Owner CENT SOUTH UNIV