New technology for extracting high-purity gold by adopting wet process

A new process and high-purity technology, which is applied in the field of wet extraction of high-purity gold, can solve the problems of low pass rate, many factors affecting product quality, and unstable quality, and achieve the effect of stable product quality and shortened recovery time

Inactive Publication Date: 2012-10-03
SICHUAN TIANZE PRECIOUS METALS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

On February 13, 2008, the State Intellectual Property Office announced the electrolysis production process with the publication number CN101122032A. High-purity gold is produced through steps such as gold-making electrolyte, electrolysis, and finished product treatment. This method has a long process flow and needs to maintain a high gold ion concentration. , the backlog of gold is serious, and chlorine gas may be generated at the anode at the same time, there are many factors affecting product quality, the pass rate is low, and it is difficult to apply it on a large scale in actual production; on November 4, 2009, the extraction production process with the publication number CN101570830A was announced, and passed by Wang Water dissolution, ether extraction, reduction and other steps produce high-purity gold. The reagent preparation

Method used

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  • New technology for extracting high-purity gold by adopting wet process
  • New technology for extracting high-purity gold by adopting wet process
  • New technology for extracting high-purity gold by adopting wet process

Examples

Experimental program
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Example Embodiment

[0023] Example 1

[0024] A. Weigh 1 kg of gold with a gold content of 99.99%, rinse with water, take 40ml of 65-68% nitric acid and 500ml of deionized water to make 5% dilute nitric acid, soak the gold for 10 minutes, and rinse with deionized water until it is neutral;

[0025] B Put the gold in a glass reactor, add 500ml of 65-68% nitric acid (analytical purity), and 1500ml of 36-38% hydrochloric acid (analytical purity), and turn on the electric heating plate;

[0026] C. Dissolve the gold for 2 hours, then add 800ml hydrochloric acid, heat and concentrate to 2000ml, to drive out the NO3 in the precious liquid - ;

[0027] D. Stop heating, add about 1330ml deionized water to dilute and cool to room temperature, filter out the insoluble gold and AgCl precipitation in the precious liquid;

[0028] E. Heat the filtrate to 30℃, and slowly pour SO into the filtrate 2 Gas, and constantly stir the precious liquid, control the temperature of the precious liquid to keep it at about 30℃, measu...

Example Embodiment

[0035] Example 2

[0036] Weigh 1 kg of gold containing 99.992% gold, and control the reduction temperature to 40°C and the end potential 700mv according to the method of Example 1. Repeat the above implementation 3 times, the experimental results are as follows:

[0037]

Example Embodiment

[0038] Example 3

[0039] Weigh 1 kg of gold containing 99.992% gold, and control the reduction temperature to 50°C and the terminal potential to 700 mv according to the method of Example 1. Repeat the above implementation 3 times, the experimental results are as follows:

[0040]

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Abstract

The invention relates to a new technology for extracting high-purity gold by adopting a wet process, which comprises the following steps: melting gold in aqua regia; concentrating and removing nitrate; diluting and filtering; reducing and depositing; filtering and cleaning; and fusing ingot casting. In the step of reducing and depositing, SO2 is taken as a reducing agent; when the electric potential of the solution is 680-730mv, especially when the electric potential of the solution is 700mv, the introduction of reducing gas is stopped, so that the purity of the end product is kept above 99.999% and the once percent reduction of the product is higher. According to the new technology, the optimal reduction temperature is confirmed; when the reduction temperature is at 40-60 DEG C, optimal temperature is at 50 DEG C; and the reduction time is effectively shortened.

Description

technical field [0001] The invention relates to a new process for extracting high-purity gold by wet method. technical background [0002] With the advancement and development of science and technology, gold with a gold content of 99.99% can no longer meet the needs of special industries such as aerospace, and the production of high-purity gold with a gold content of 99.999% and above has attracted more and more attention. Due to its good market prospects, various enterprises Competing to study the production process of high-purity gold. On February 13, 2008, the State Intellectual Property Office announced the electrolysis production process with the publication number CN101122032A. High-purity gold is produced through steps such as gold-making electrolyte, electrolysis, and finished product treatment. This method has a long process flow and needs to maintain a high gold ion concentration. , the backlog of gold is serious, and chlorine gas may be generated at the anode at ...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/44C22B11/00
CPCY02P10/20
Inventor 陈黎阳何永宁张俭农吕长东周仁义刘立玄王波
Owner SICHUAN TIANZE PRECIOUS METALS
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