Method for reducing gold extraction residual liquid

A technology of residual liquid and gold extraction, which is applied to the improvement of process efficiency and other directions, can solve the problem of a large amount of copper entering, and achieve the effect of improving the product qualification rate

Active Publication Date: 2016-01-20
JINCHUAN GROUP LIMITED
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem solved by the present invention is to provide a method for reducing and precipitating gold extraction raffinate for the problem that a large amount of copper enters the rhodium-iridium slag in the existing platinum-palladium reduction technology. The copper powder reduction process has been greatly reduced, and it is easy to follow up with the separation of rhodium and iridium and the refining of rhodium and iridium, and the pass rate of rhodium and iridium powders has been greatly improved

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  • Method for reducing gold extraction residual liquid

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Effect test

Embodiment 1

[0018] Raise the temperature of 200L of gold-extracting liquid to 90°C, slowly add 40L of hydrochloric acid under stirring, stop stirring after completion, concentrate the volume to 60L, add pure water to dilute the gold-extracting liquid to 750L, and titrate the acidity of the gold-extracting liquid to 2.5mol / L, control the temperature of the residual gold extraction solution at 50°C, slowly add sodium bisulfite for reduction, adjust the acidity of the solution to 2.5mol / L with sodium hydroxide during the process, control the terminal potential to 260mv, and keep the potential at a constant potential for 30 minutes after reaching the terminal potential. Then discharge the fine filter, heat up the primary reducing solution to 50°C, slowly add zinc powder to precipitate rhodium iridium, control the end point pH to 3.5, and end point potential to -400mv, then add magnesium powder to precipitate rhodium iridium again, control the pH to 5.5, and react After reaching the end point,...

Embodiment 2

[0019] Example 2: The volume of the gold extraction raffinate is 250L, the temperature is raised to 95°C and the volume is concentrated to 70L, and pure water is added to dilute the gold extraction raffinate to 700L, the acidity of the gold extraction raffinate is titrated to 1.5mol / L, and the concentration of the gold extraction raffinate is controlled. The temperature is 60°C, slowly add sodium bisulfite for reduction under stirring, adjust the acidity of the solution to 1.5mol / L with potassium hydroxide during the reduction process, control the terminal potential to 230mv, keep the potential at a constant potential for 60 minutes after reaching the terminal potential, and then discharge the material accurately Filtrate, raise the temperature of the primary reducing solution to 60°C, slowly add zinc powder to precipitate rhodium and iridium under stirring, control the end point pH to 3.0, and the end point potential to -450mv, then add magnesium powder to precipitate rhodium i...

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Abstract

The invention discloses a method for reducing gold extraction residual liquid, and relates to a process for separating platinum palladium and other metals from the gold extraction residual liquid by using sodium hydrogen sulfite and settling zinc magnesium powder to separate rhodium iridium and base metals; after the acidity of the gold extraction residual liquid is adjusted, the sodium hydrogen sulfite is reduced; the zinc magnetism powder is settled through once reducing liquid; and rhodium refining and iridium refining are respectively performed for produced rhodium iridium slag after the separation of rhodium and iridium to generate rhodium powder and iridium powder accordant with the national standards. The method is simple in process flow, convenient for operation and reasonable in procedure joint. The method can enable the copper content in the subsequently produce once reducing liquid to largely reduce; the platinum and palladium settling rates are both higher than 99%; the once reducing liquid is prepared to secondary reducing liquid by the replacement of zinc magnesium powder; the settling rates of noble metals in the secondary reducing process are higher than 99.95%; the rhodium iridium slag weight generated by secondary reduction is reduced by above 65% compared with a traditional process; the method can shorten the process flow of rhodium and iridium refining; and the product pass percent is largely increased.

Description

technical field [0001] The invention relates to the technical field of metal separation and purification, in particular to a method for reducing a gold extraction raffinate. Background technique [0002] In the traditional smelting process of platinum group metals, copper powder is generally used to replace and separate platinum, palladium and other metals in the gold extraction raffinate, and then zinc and magnesium powder are used to precipitate rhodium-iridium slag, which is used for rhodium-iridium separation and purification. Because more copper powder is introduced in the copper powder replacement process, copper will also be precipitated into the rhodium-iridium slag during the zinc-magnesium powder precipitation rhodium-iridium slag. The increase in the iridium refining process has resulted in a lower qualified rate of rhodium and iridium products, increasing production costs. Contents of the invention [0003] The technical problem solved by the present invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B11/00
CPCY02P10/20
Inventor 潘从明郭晓辉张川山王立朱纪念孙渊君
Owner JINCHUAN GROUP LIMITED
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