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Preparation technology of potassium aurous cyanide

A technology of potassium aurous cyanide and preparation process, which is applied in the field of gold plating, can solve the problems of high requirements for stirring and high requirements on raw materials, and achieves the effects of avoiding local high temperature, low ionic conductivity and increasing processing capacity

Inactive Publication Date: 2020-02-18
衡阳市晋宏精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to increase the reaction rate, ultra-fine gold powder must be used, so the requirements for raw materials are very high, and the method requires a lot of stirring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Cleaning of gold flakes: take 20kg of gold flakes, and the gold flakes generally adopt International No. Rinse the surface of the gold sheet with pure water and dry;

[0030] (2) Electrochemical dissolution: place the dried gold flakes in a titanium basket, put the titanium basket into the mother liquor tank of the electrolytic cell, use the dried gold flakes as the anode, stainless steel as the cathode, and cyanide Potassium solution is anolyte, and the mass concentration of potassium cyanide solution is 35%, and the weight of potassium cyanide in potassium cyanide solution is 12kg, is catholyte with potassium hydroxide solution, and the mass concentration of potassium hydroxide solution is 20-40 %, the cathode and the anode are separated by a diaphragm, the diaphragm is preferably a perfluorinated ion exchange membrane, at 70°C, the voltage is 6.5V, and the current density is 100A / m 2 Under the conditions of electrolysis for 6h;

[0031] (3) Cooling crystallizat...

Embodiment 2

[0035] (1) Cleaning of gold flakes: take 20kg of gold flakes, and the gold flakes generally adopt International No. Rinse the surface of the gold sheet with pure water and dry;

[0036](2) Electrochemical dissolution: place the dried gold flakes in a titanium basket, put the titanium basket into the mother liquor tank of the electrolytic cell, use the dried gold flakes as the anode, stainless steel as the cathode, and cyanide Potassium solution is anolyte, and the mass concentration of potassium cyanide solution is 37%, and the weight of potassium cyanide in potassium cyanide solution is 10.8kg, is catholyte with potassium hydroxide solution, and the mass concentration of potassium hydroxide solution is 20- 40%, the cathode and the anode are separated by a diaphragm, the diaphragm is preferably a perfluorinated ion exchange membrane, at 65°C, the voltage is 6.6V, and the current density is 60A / m 2 Under the conditions of electrolysis for 8h;

[0037] (3) Cooling crystallizat...

Embodiment 3

[0041] (1) Cleaning of gold flakes: take 20kg of gold flakes, and the gold flakes generally adopt International No. Rinse the surface of the gold sheet with pure water and dry;

[0042] (2) Electrochemical dissolution: place the dried gold flakes in a titanium basket, put the titanium basket into the mother liquor tank of the electrolytic cell, use the dried gold flakes as the anode, stainless steel as the cathode, and cyanide Potassium solution is anolyte, and the mass concentration of potassium cyanide solution is 40%, and the weight of potassium cyanide in potassium cyanide solution is 10.0kg, is catholyte with potassium hydroxide solution, and the mass concentration of potassium hydroxide solution is 20- 40%, the cathode and the anode are separated by a diaphragm, the diaphragm is preferably a perfluorinated ion exchange membrane, at 68°C, the voltage is 6.7V, and the current density is 80A / m 2 Under the conditions of electrolysis for 7.5h;

[0043] (3) Cooling crystalli...

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Abstract

The invention belongs to the technical field of gold plating, and relates to a preparation technology of potassium aurous cyanide. The preparation technology comprises following steps: (1) washing a gold sheet: soaking a gold sheet in diluted nitric acid, washing the gold sheet by pure water, and drying; (2) carrying out electrochemical dissolution: carrying out electrolysis at a temperature of 65to 75 DEG C under a voltage of 6-7 V and a current density of 60-150 A / m2; (3) carrying out cooling and crystallization: carrying out twice cooling and crystallization on the electrolyte, filtering,washing obtained potassium aurous cyanide crystals by pure water until the pH reaches 8-10, and carrying out suction filtration in vacuum; and (4) drying: drying the crystals for 8 to 10 hours at a temperature of 80 to 100 DEG C. The provided preparation technology has the advantages that the electrolysis conditions are reasonable, a good environment is provided for gold electrolysis, the gold electrolytic rate is largely increased and can reach 85% or more; after crystallization, the gold mass percentage can reach 68.3% or more; the quality of prepared potassium aurous cyanide is stable; theproduction cost is controllable, and the economic benefit is good.

Description

technical field [0001] The invention belongs to the technical field of gold plating, and in particular relates to a preparation process of potassium aurous cyanide. Background technique [0002] Potassium aurous cyanide (KAu(CN) 2 ), commonly known as gold salt, is mainly used in gold plating process. The purity of potassium aurous cyanide directly determines the effect of gold plating, and the purity of potassium aurous cyanide is usually expressed by the mass fraction of gold in potassium aurous cyanide. The higher the mass fraction of gold in potassium aurous cyanide, the higher its purity and the less impurities it contains. In theoretical calculation, the mass fraction of gold in potassium aurous cyanide is 68.367%. And when the massfraction of gold in potassium aurous cyanide was 68.3%, the corresponding product purity was 99.9%; the massfraction of gold in potassium aurous cyanide was 68.2%, and the corresponding product purity had only 99.75%. The mass fraction o...

Claims

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Application Information

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IPC IPC(8): C25B3/00C25D3/48
CPCC25B3/00C25D3/48
Inventor 龙佳志
Owner 衡阳市晋宏精细化工有限公司
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