Preparation technology of high purity gold

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...

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