Preparation technology of high purity gold

A preparation process, gold technology, applied in photography technology, photography auxiliary technology, improvement of process efficiency, etc., to achieve excellent extraction performance, avoid high energy consumption and low efficiency, and improve the metal recovery rate

Active Publication Date: 2015-03-11
CHANGZHOU YIJIN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to: aim at the problems existing in the preparation of high-purity gold in the prior art, avoid the shortcoming of repeating

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  • Preparation technology of high purity gold

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[0023] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0024] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0025] Such as figure 1 Shown, the preparation technology of high-purity gold comprises the following steps:

[0026] Step S1, firstly, the gold ingot of No. 1 gold with a raw gold purity of 99.99% or No. 2 gold with a content greater than 99.95% is pressed into tablets, and the obtained gold sheet (foil) is washed with pure water and placed in an electrolytic cell ;

[0027] Step S2, pour electrolyte solution in the electrolytic cell, the ...

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Abstract

The invention discloses a preparation technology of high purity gold. Through a three-grade purifying technology comprising steps of ion membrane electrolyte and liquid-making, extraction, and reduction reverse extraction, high purity gold with a gold content of 99.999% or more can be obtained at one time. At first, coarse gold is dissolved through an ion exchange membrane electrochemical dissolving technology so as to obtain a chloroauric acid solution, a primary purification is achieved and at the same time a solution is prepared. A composite extracting agent is added into the chloroauric acid solution, then a gold-bearing organic phase is separated from the solution and washed, and the secondary purification is achieved. After washing, the gold-bearing organic phase is subjected to chemical reduction and reverse extraction so as to achieve the tertiary purification. The obtained gold powder can be melt and casted into ingots so as to obtain high purity gold with a gold content of 99.999% or more. The provided three-grade purifying technology is simple, is capable of processing different coarse gold materials, and has high production efficiency. Furthermore, the procedure is short. So the energy consumption and waste discharge during the production process are both reduced. Automatic production is easy to achieve, and great economic and social profits are generated by the provided preparation technology.

Description

technical field [0001] The invention relates to the technical field of precious metal hydrometallurgy, in particular to a preparation process of high-purity gold. Background technique [0002] Due to its unique properties, high-purity gold is used more and more widely. In recent years, with the rapid development of electronics and aviation industries, the purification process of high-purity gold has been developed rapidly. The methods for preparing high-purity gold mainly include chemical reduction, solvent extraction, and electrolytic refining, but each preparation technology has its specific scope of application and advantages and disadvantages. Electrolytic refining is an important production method for the purification of crude gold. It has been widely used due to its advantages of stable process, easy control, and easy mass production. Multiple extractions are required, resulting in high pollution, high labor intensity, long production cycle, and high cost; it is diff...

Claims

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Application Information

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IPC IPC(8): C25C1/20C22B11/00C22B3/40
CPCC22B11/00C25C1/20C22B3/26Y02P10/20
Inventor 范义春王琪杨雨佳李久云
Owner CHANGZHOU YIJIN ENVIRONMENTAL PROTECTION TECH
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