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Method of wet extraction of silver from cyanide silver 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 and no practical value, and achieves increasing melt fluidity, reducing separation and impurity removal steps, and shortening the process. The effect of the process

Active Publication Date: 2018-03-13
山东金创金银冶炼有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes different ways to control the properties or characteristics (such as particle size) of gold particles by controllably adding certain chemicals like cobalt blue dye, nickel salt, zinc oxysulfonimides, etc., resulting in improved purification efficiency without causing contamination issues. Additionally, this method allows for easy filtration and reformation processes, simplifying production operations and increasing recoveries compared to traditional methods. Overall, these technical results help create economically viable products at competitive prices.

Problems solved by technology

This patents discuss various ways to extract pure silver (Ag) without harmful chemicals like mercuric sulfite). These techniques involve different types of processes including purification steps, redox reaction schemes, ionexchange resin columns, etc., but they can still result in low efficiency due to their use of expensive noble metals like gold. Additionally, current methods require long periods of treatment before complete removal of any impurity content.

Method used

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  • Method of wet extraction of silver from cyanide silver mud
  • Method of wet extraction of silver from cyanide silver mud
  • Method of wet extraction of silver from cyanide silver mud

Examples

Experimental program
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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

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Claims

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Application Information

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Owner 山东金创金银冶炼有限公司
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