Preparation method for auric potassium citrate for gold plating
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A technology of gold potassium citrate and potassium citrate, applied in the field of preparation of gold potassium citrate for gold plating, can solve problems such as difficult control of chemical process, and achieve the effects of low cost, good quality and simple preparation equipment
Active Publication Date: 2013-01-02
SUZHOU XINGRUI NOBLE METAL MATERIAL
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Problems solved by technology
[0003] The first problem to be solved by the present invention is to overcome the problem that the chemical process of tetrachloroauric acid reducing monovalent gold as a raw material is difficult to control in the prior art, and a kind of preparation method of gold potassium citrate for gold plating with stable reaction is provided
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Embodiment 1
[0024] Take 100ml of gold potassium sulfite solution with a gold content of 50g / L and add it to a 250ml three-necked flask, add 12g of potassium citrate, heat to 60°C under stirring, add 3g of malononitrile, and after all of the solution is dissolved, feed high-purity oxygen. Flow rate 0.5M 3 After 24 hours, no sulfite was detected, concentrated under reduced pressure, cooled to obtain a white solid, suction filtered, washed 2 times with pure water, each 20ml of water, and dried at 105 degrees to obtain 9.1g of potassium gold citrate, The gold content is 51.1%, and the clarity of the aqueous solution is qualified.
Embodiment 2
[0026] Take 1000ml gold potassium sulfite solution with a gold content of 5g / L and add it to a 2000ml three-necked flask, add 6g potassium citrate, heat it in a water bath to a temperature of 60 degrees under stirring, add 3g malononitrile, and after it is completely dissolved, pass it into a high-purity Oxygen, flow rate 0.5M 3 / hour, concentrated under reduced pressure after 24 hours, cooled to obtain a white solid, suction filtered, washed twice with pure water, 20ml of water each time, and dried at 105 degrees to obtain 8.9g of gold potassium citrate, gold content 51.1%, aqueous solution Clarity is acceptable.
Embodiment 3
[0028] Take 100ml of gold potassium sulfite solution with a gold content of 50g / L and add it to a 250ml three-necked flask, add 6g of potassium citrate, heat it in a water bath to 60 degrees under stirring, add 3g of malononitrile, and after it is completely dissolved, let it flow into the air. 0.5M 3 After 72 hours, no sulfite was detected, concentrated under reduced pressure, cooled to obtain a white solid, suction filtered, washed 2 times with pure water, each 20ml of water, and dried at 105 degrees to obtain 9.1g of potassium gold citrate, The gold content is 51.1%, and the clarity of the aqueous solution is qualified.
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Abstract
The invention discloses a preparation method for auric potassium citrate for gold plating. Potassium citrate and malononitrile are added into auric potassium sulfite aqueous solution and completely dissolved, oxygen or air is then introduced into the solution, after a certain period of time, the condition that sulfite ions do not exist in the solution by testing through a piece of sulfite test paper is ensured, water is distilled out under reduced pressure, the solution is concentrated into solid, the solid is cooled, white solid is obtained by washing, filtered under vacuum and dried, then the auric potassium citrate is obtained, and the reaction molar ratio of the auric potassium sulfite to the malononitrile to the potassium citrate is 1:1:2. The auric potassium sulfite with monovalent aurous ions adopted as material by the preparation method is essentially different from the trivalent gold used as starting material in the prior art, the gold oxidation-reduction process is not involved, the process of oxidizing sulfite with oxygen is stable, preparation equipment is simple, the cost is low, the quality is high, and the product can be mass-produced, and can completely substitute auric potassium cyanide.
Description
technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a preparation method of gold potassium citrate for gold plating. Background technique [0002] Potassium gold citrate is a gold reagent for gold plating with low cyanide content. Henan Sanmenxia Hengsheng Technology Co., Ltd. used chloroauric acid, potassium citrate and malononitrile to prepare potassium gold citrate for the first time. The characterization and characteristics of potassium gold citrate were introduced in detail, and three patents were published, namely, China Application CN101671829, Chinese application CN101250730 and Chinese application CN101172946, the gold-containing raw materials of the technical solutions protected in the three patents are tetrachloroauric acid, that is, trivalent gold is used as raw material, potassium citrate is used as reducing agent, malononitrile is used as complex stabilizer to prepare monovalent gold ...
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