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Method for removing silver from gold-containing material

A material and gold powder technology, applied in the field of removing silver from gold-containing materials, can solve problems such as excessive silver content, and achieve the effect of improving the pass rate and ensuring the recovery rate

Active Publication Date: 2021-04-23
DAYE NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-cost, short-process, simple and easy-to-operate, stable process, low gold system occupancy, and direct recovery of the gold powder produced by the traditional chlorination-controlled electric reduction process, in which the silver content exceeds the standard. Gold refining process with high efficiency and effective removal of excessive silver in gold powder

Method used

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  • Method for removing silver from gold-containing material

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Effect test

Embodiment 1

[0033] A kind of method for removing silver from gold-containing material of the present embodiment, comprises the following steps:

[0034] (1) High-temperature pickling: Add 300 kg of gold-containing material with a mass fraction of 35% to the reaction kettle, add 700 L of concentrated hydrochloric acid with a mass fraction of 40%, slowly raise the temperature of the solution to above 95 °C, and stir at constant temperature for 2 h. Continue to stir for 2 h to filter after stopping the temperature rise, the filter residue is 108 kg of pickling gold powder containing gold with a mass fraction of 93.2%, and the filtrate is retained for use;

[0035] (2) High-temperature oxidative chlorination: Add 70.2 kg of sodium chlorate to the obtained pickling gold powder, stir evenly and put it into a titanium reactor, slowly add concentrated hydrochloric acid with a mass fraction of 32% until the pickling gold powder is completely dissolved, and heat up Concentrate at a constant tempera...

Embodiment 2

[0041] A kind of method for removing silver from gold-containing material of the present embodiment, comprises the following steps:

[0042] (1) High-temperature pickling: Add 288 kg of gold-containing material with a mass fraction of 46% to the reaction kettle, add 650 L of concentrated hydrochloric acid with a mass fraction of 32%, slowly raise the temperature of the solution to above 95 °C, and stir at constant temperature for 2 h. Continue stirring for 2 h to filter after stopping the temperature rise, the filter residue is 135 kg of pickling gold powder containing gold with a mass fraction of 94.13%, and the filtrate is retained for use;

[0043] (2) High-temperature oxidative chlorination: Add 81 kg of sodium chlorate to the above pickling gold powder, stir evenly and put it into a titanium reactor, slowly add concentrated hydrochloric acid with a mass fraction of 32% until the pickling gold powder is completely dissolved, and heat up to Concentrate at a constant tempera...

Embodiment 3

[0049] A kind of method for removing silver from gold-containing material of the present embodiment, comprises the following steps:

[0050] (1) High-temperature pickling: Add 320 kg of gold-containing materials with a mass fraction of 65% to the reaction kettle, add 750 L of concentrated hydrochloric acid with a mass fraction of 35%, slowly raise the temperature of the solution to above 95 °C, and stir at a constant temperature for 2 h. Continue to stir for 2 h to filter after stopping the temperature rise, the filter residue is 218 kg of pickling gold powder with a gold mass fraction of 95.33%, and the filtrate is retained;

[0051] (2) High-temperature oxidative chlorination: Add 174.4 kg of sodium chlorate to the above pickling gold powder, stir evenly and put it into a titanium reactor, slowly add concentrated hydrochloric acid with a mass fraction of 32% until the pickling gold powder is completely dissolved, and heat up to Concentrate at a constant temperature of 100°C ...

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Abstract

The invention discloses a method for removing silver from a gold-containing material. According to the method, the gold-containing material is subjected to steps of high-temperature acid pickling, high-temperature oxidation chlorination and low-temperature filtration, high-temperature controlled electroreduction, high-temperature oxidation impurity removal and the like, and finally gold powder with the grade of more than or equal to 99.99% is prepared. The method is easy and convenient in operation, low in cost, simple in technological process and low in requirement for equipment, the recovery rate of gold in the whole technological process is high, the problems that gold powder and silver impurities produced through a traditional chlorination controlled electroreduction technology are not thoroughly separated, chlorination is conducted many times, system occupation is high are solved, and the problems that production cost is high and operation intensity is large are solved; and the gold powder with the purity higher than 99.99% can be prepared through the method, and the method is suitable for wide application and popularization.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for removing silver from gold-containing materials. Background technique [0002] At present, our company's gold refining raw materials are obtained by precipitation of gold-containing solution through sodium sulfite, which contains a large amount of hydrolysis and reduction products of bismuth, antimony and arsenic, as well as running-mixed materials in the anode slime gold chlorination and filtration process, resulting in very complex components of gold-containing materials . It is only produced by the controlled electric reduction process after chlorination. Generally, the gold powder product formed for the first time is difficult to meet the standard, and the impurities exceed the standard by 2-5 times. It needs to repeat the chlorination controlled electric reduction process 1-2 times to reach the standard, resulting in waste of cost , The loss increased, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/06C22B3/10C22B3/22C22B3/44
CPCC22B11/06C22B11/04C22B3/10C22B3/22C22B3/44Y02P10/20
Inventor 房孟钊李伟黄向祥赵浩然余珊王亚东罗杰
Owner DAYE NONFERROUS METALS
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