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A kind of method of wet extraction silver from silver cyanide mud

A silver cyanide and wet process technology, applied in the field of silver cyanide mud recycling, can solve the problems of the danger of hydrogen-explosive silver compounds, no practical value, etc., so as to increase melt fluidity, reduce separation and impurity removal steps, and avoid reaction Effect

Active Publication Date: 2019-12-10
山东金创金银冶炼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the possibility of hydrogen explosion and the danger of forming explosive silver compounds such as silver fulminate mentioned above, so it has no practical value

Method used

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  • A kind of method of wet extraction silver from silver cyanide mud
  • A kind of method of wet extraction silver from silver cyanide mud
  • A kind of method of wet extraction silver from silver cyanide mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment includes the following steps:

[0032] ① Put silver cyanide mud into the reaction kettle according to a certain solid-liquid ratio, control the potential, make it chlorinated in the medium of sulfuric acid and sodium chloride, make all the copper, selenium and part of the gold enter the solution, and control the sulfuric acid and chlorine The ratio of sodium chloride mixture to silver cyanide mud is 4:1, and the concentration of sulfuric acid is 10%;

[0033] ②Add a certain proportion of starch and iron powder mixed solution to the silver-containing mixed solid obtained from solid-liquid separation in step ①, heat up to 1200°C for 10 minutes, cool to 900°C, and filter;

[0034] ③ adding the hydrotalcite and fluorite soaked in the ethanol solution containing the mercapto functional group for 35 hours to the solid obtained by filtering in step ②, roasting together, and cooling;

[0035] ④ Add zinc powder, carbon powder and glass powder to the cooled slag ...

Embodiment 2

[0039] This embodiment includes the following steps:

[0040] ① Put silver cyanide mud into the reaction kettle according to a certain solid-liquid ratio, control the potential, make it chlorinated in the medium of sulfuric acid and sodium chloride, make all the copper, selenium and part of the gold enter the solution, and control the sulfuric acid and chlorine The ratio of sodium chloride mixture to silver cyanide mud is 5:1, and the concentration of sulfuric acid is 8%;

[0041] ②Add a certain proportion of starch and iron powder mixed solution to the silver-containing mixed solid obtained from solid-liquid separation in step ①, heat up to 1200°C for 13 minutes, cool to 900°C, and filter;

[0042] ③ adding the hydrotalcite and fluorite soaked in the ethanol solution containing the mercapto functional group for 30 hours to the solid obtained by filtering in step ②, roasting together, and cooling;

[0043] ④ Add zinc powder, carbon powder and glass powder to the cooled slag o...

Embodiment 3

[0047] This embodiment includes the following steps:

[0048] ① Put silver cyanide mud into the reaction kettle according to a certain solid-liquid ratio, control the potential, make it chlorinated in the medium of sulfuric acid and sodium chloride, make all the copper, selenium and part of the gold enter the solution, and control the sulfuric acid and chlorine The ratio of sodium chloride mixture to silver cyanide mud is 7:1, and the concentration of sulfuric acid is 9%;

[0049] ②Add a certain proportion of starch and iron powder mixed solution to the silver-containing mixed solid obtained from solid-liquid separation in step ①, heat up to 1200°C for 15 minutes, cool to 900°C, and filter;

[0050] ③ adding the hydrotalcite and fluorite soaked in the ethanol solution containing the mercapto functional group for 33 hours to the solid obtained by filtering in step ②, roasting together, and cooling;

[0051] ④ Add zinc powder, carbon powder and glass powder to the cooled slag o...

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Abstract

The invention belongs to the field of smelting of silver cyanide mud, and in particular relates to a method of wet extraction of silver from cyanide silver mud. The silver cyanide mud is treated through a medium-high potential wet method to be chloridized to become solid silver cyanide mud which continues to be treated by a series of steps of roasting, heating, cooling, reduction and the like to obtain elemental silver; with polyhydroxy aldehydes used for reduction, silver is quickly and efficiently reduced to the solid, and the elemental silver of high purity is obtained. The method of wet extraction of silver from the cyanide silver mud has the advantages of easy control of process conditions, simple equipment and low cost, high added value of products, high direct recovery efficiency, high safety, small environmental pollution and high economic efficiency.

Description

technical field [0001] The invention belongs to the field of recycling silver cyanide mud, in particular to a method for extracting silver from silver cyanide mud by wet method. Background technique [0002] Silver is a precious metal with wide application and large consumption, and it is an indispensable product or raw material in life and industry. Usually, while the main metal elements in the ore are mined and utilized, a variety of beneficiation methods are used for comprehensive recovery according to the occurrence state and embedded distribution characteristics of the associated silver in the raw ore. In addition to silver-containing ore, silver-containing raw materials such as electrolytic anode slime and silver-containing waste have gradually become the main source of silver extraction. The traditional methods of recovering silver from silver-containing waste liquid mainly include precipitation method, electrolysis method, reduction substitution method and ion excha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B11/00
CPCC22B1/02C22B7/007C22B11/042Y02P10/20
Inventor 李元鑫王卫亭孙晓丰李风良符金武张少良张晓军王金超王付才
Owner 山东金创金银冶炼有限公司
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