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Gold potassium lemon acid for gold plating and method for producing the same

A technology of gold potassium citrate and potassium citrate, which is applied in the chemical field, can solve the problems of high potassium cyanide content, high toxicity, and infrequent use, and achieve the effect of reducing pollution and reducing the cost of wastewater treatment

Active Publication Date: 2011-02-16
HENGSHENG TECH R&D CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In alkaline cyanide gold plating, the auxiliary materials are potassium cyanide, potassium carbonate, and potassium dihydrogen phosphate. Because the content of potassium cyanide in the electroplating solution of this gold plating process is too high and the toxicity is high, most enterprises do not use it much.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Physicochemical properties of gold potassium citrate for gold plating: white crystalline powder, easily soluble in water, slightly alkaline, with a melting point of 149.5°C.

[0020] Calculated by preparing 1000g of gold potassium citrate.

[0021] Example 1, at normal temperature and pressure, add 10000mL of water into the reactor, turn on the stirrer and heating switch, and when the temperature of the water rises to 85°C, add 500g of gold trichloride under stirring conditions to make it completely dissolve With the above-mentioned gold trichloride solution under stirring conditions, keep the temperature at 85°C, concentrate for 4 hours, when the volume is 2000mL, add water to the reactor to 10000mL, and then concentrate to 2000mL under the same conditions, Add water to 10000mL; keep the above-mentioned gold trichloride solution at 85°C, take 800g of potassium citrate, dissolve it in 20000mL of 85°C hot water, filter to remove trace impurities in the solution, and add ...

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Abstract

The invention discloses citric acid gold potassium used for gold plating and the preparation method thereof. The molecular formular of the citric acid gold potassium is K3Au2C9H5O7N2. The method comprises the steps as follows: gold trichloride is dissolved in water of certain temperature, is concentrated and diluted under the temperature for multiple times, and is reacted with potassium citrate, ethylene diamine tetraacetic acid and malononitrile in a reactor under the certain temperature and the certain time to produce the organic gold salt which has low toxicity and contains no free cyanogen. When the product has the same gold content with the potassium gold cyanide, the total CN- is 5 to 6 percent, being 50 percent lower than that of the CN- in the potassium gold cyanide. The waste liquid after gold plating contains free the CN- in small amount. The invention reduces the cost of waste water treatment for the electroplating plants.

Description

technical field [0001] The invention relates to a gold citrate salt for gold plating, in particular to a preparation method of gold potassium citrate for gold plating, which belongs to the field of chemical technology. Background technique [0002] In the gold plating industry, because potassium cyanide has a strong complexing force on gold ions, most enterprises in my country choose inorganic electroplating gold salt——potassium aurous cyanide as the main salt of gold plating during electroplating. The corrosion resistance of the workpiece and the characteristics of the coating and the plated parts are then formulated with an acidic gold plating or alkaline gold plating solution to meet the requirements of the process conditions. [0003] National Defense Industry Press published the first edition in June 1990, and the book "Practical Electroplating Process" edited by Li Hongnian, Zhang Shaogong, Zhang Bingqian, Song Ziyu, etc., which was printed for the second time in Novemb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C59/265C07C51/41
Inventor 张群刚
Owner HENGSHENG TECH R&D CO LTD
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