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A kind of gold potassium citrate production technology

A gold potassium citrate, production process technology, applied in the field of gold plating, can solve the problems of easy viscous and hardening of the system, unstable pH, insufficient crystallization, etc., and achieve the effects of stable pH value, improved quality, and low cost

Active Publication Date: 2022-02-22
泰州市欣港电子材料有限公司
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Problems solved by technology

[0004] But, there is certain shortcoming in existing gold potassium citrate preparation technology: commercially available citric acid acid salt kind is few, generally commonly used citric acid and potassium carbonate reaction production obtains, and its purity is not high, and pH is unstable, can't satisfy Require
And adopt potassium citrate and citric acid to prepare in the process of citric acid salt, system becomes viscous and hardens easily, can cause the situation that reaction is not thorough, also often occurs and mix unevenly with potassium aurous cyanide and cause insufficient crystallization question

Method used

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  • A kind of gold potassium citrate production technology

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Embodiment 1

[0048] 1. Preparation of Potassium Dihydrogen Citrate

[0049] (1) Raw material pulverization: take citric acid and potassium citrate as raw materials, and pulverize the above two kinds of raw materials to 40 mesh respectively, and place them in sealed containers respectively after pulverizing to prevent moisture absorption. Citric acid and citric acid used as raw materials meet the analytical purity standard of national standard reagent grade. (2) Batching: Get the powder of the above two raw materials and carry out batching according to a predetermined ratio, citric acid is 2100g, potassium citrate is 1620g, and the weight ratio of the two is 1.296:1, that is, the molar ratio of the two is 2:1, wherein The calculated weights of citric acid and potassium citrate are water-containing weights. (3) Mixing of raw materials: mix the above two raw materials uniformly immediately after batching according to the above ratio, and the mixing time is 10 minutes. (4) Mixing with water:...

Embodiment 2

[0053] Prepare gold potassium citrate according to the production process of embodiment 1, difference is: the step (5) of preparing potassium dihydrogen citrate carries out in the heating reaction in the mode of steam bath, after experiment steam bath 15 minutes, raw material temperature is at 80 At about ℃, stir and mix with a plastic rod for 5 minutes. Wherein, adding water accounting for 0.5% of the raw material weight during the stirring process makes the material soften and facilitate stirring. Other processing steps are all identical with embodiment 1.

[0054] In step 1, 3398 g of potassium dihydrogen citrate was finally obtained, with a yield of 98.5% and a purity of 99%. In the step 2, 4239g of gold potassium citrate is finally obtained, the yield is 99.5%, the gold content is 46.6%, and the pH value of the product is 3.5.

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Abstract

The invention relates to a production process of gold potassium citrate. The production process first uses citric acid and potassium citrate as raw materials to prepare potassium dihydrogen citrate, then adds potassium aurous cyanide and potassium dihydrogen citrate, mixes them with water, and then dries them to prepare potassium gold citrate. The gold potassium citrate production process of the present invention has high production efficiency, low cost and environmental protection, and the prepared gold potassium citrate product has high quality and stable pH value, can meet the requirements of the gold plating process, and has great industrial production application value .

Description

technical field [0001] The invention relates to the technical field of gold plating, in particular to a production process of potassium gold citrate. Background technique [0002] Gold plating is a surface processing technology widely used in various industrial production fields. Potassium gold citrate is an important raw material used in the gold plating process. It can be used as a substitute for potassium aurous cyanide used in the traditional process. It can simultaneously supplement the consumption of gold and citrate in the gold plating process and simplify the difficulty of the process. , The advantage of lower toxicity. [0003] Existing potassium aurous citrate production technique is to prepare with the method for mixing crystallization after potassium aurous cyanide and citrate, citric acid adding water; The powder is prepared by adding water in a predetermined proportion and mixing thoroughly. For example, the Chinese published patent document CN101781784A has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/41C07C59/265C25D3/48
CPCC25D3/48C07C51/412
Inventor 唐立群翟华春顾海健刘龙坤
Owner 泰州市欣港电子材料有限公司
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