Preparation method of potassium gold citrate for gold plating

A technology of gold potassium citrate and lemon, which is applied in the field of preparation of gold potassium citrate for gold plating, which can solve the problems of poor product uniformity, small gold loss, easy partial plate agglomeration, etc., to prevent product segregation and improve binding force , the effect of increasing the binding force

Inactive Publication Date: 2011-08-24
张东山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a kind of preparation method of potassium gold citrate for gold plating, fundamentally solve the problem of poor uniformity of the product obtained by the existing preparation method, easy partial plate agglomeration in the process of transportation and storage, and the obtained product is uniform Good hardness, no segregation, no agglomeration during transportation and storage, and less gold loss during the preparation process

Method used

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Experimental program
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preparation example Construction

[0016] The present invention will now be described in detail. The preparation method of gold potassium citrate for gold plating of the present invention mainly comprises the following steps:

[0017] First, add powdered potassium aurous cyanide KAu(CN) to the mixing equipment 2 , water, powdered potassium citric acid salt K 3 C 6 h 5 o 7 ﹒ k 1 C 6 h 8 o 7 , and mix evenly, wherein, the weight ratio of water to citric acid potassium salt is (0.01-0.12): 1;

[0018] Then, pass the mixture of the three through a 10-mesh sieve to eliminate any lumps that may form during the mixing process;

[0019] Next, dry the sieved mixture;

[0020] Finally, pass the dried mixture through a 20-mesh sieve to eliminate the large blocks generated during drying and improve the appearance and uniformity of the product. Finally obtain gold potassium citrate product KAu(CN) 2 (K 3 C 6 h 5 o 7 ﹒ k 1 C 6 h 8 o 7 )k 2。

[0021] The optimum weight ratio range of water to potassium...

Embodiment 1

[0022] Embodiment 1 Preparation of 2kg gold potassium citrate with gold content of 40.0%

[0023] In the three-dimensional mixer with a volume of 5 liters, add 1172.0 g of high-purity potassium aurous cyanide with a gold content of 68.3%, 50 ml of water, and 828.0 g of potassium citric acid; Pass through a 40 mesh sieve. Mix at a medium speed for 20 minutes, pass the resulting mixture through a 10-mesh sieve, spread it into a thin layer in a drying tray, and dry it at 90°C; 40.0% gold potassium citrate 1999.4g, direct yield 99.97%.

Embodiment 2

[0024] Example 2 Preparation of 5kg gold potassium citrate with a gold content of 51.0% and a pH value of 5.1

[0025] In the three-dimensional mixer with a volume of 10 liters, add 3735.0 g of high-purity potassium aurous cyanide with a gold content of 68.3%, 88 ml of water, and 1267.0 g of dipotassium hydrogen citrate. 40-mesh sieve, mixed at medium speed for 18 minutes, all the obtained mixture passed through a 10-mesh sieve, spread into a thin layer in a drying tray, dried at 90°C, after cooling, crushed the agglomerates, passed through a 20-mesh sieve, and weighed , to obtain gold potassium citrate 5001.0g with a gold content of 51.0%, and a direct recovery rate of 99.98%.

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Abstract

The invention discloses a preparation method of potassium gold citrate for gold plating, which basically solves the problems that the product prepared by the existing preparation method has poor uniformity and is easy to segregate and agglomerate in the processes of transportation and preservation. The preparation method is technically characterized by comprising the following preparation processes of: adding powdered potassium gold cyanide, water and powdered acidic potassium citrate into mixing equipment and uniformly mixing, wherein the weight ratio of the water to the acidic potassium citrate is (0.01-0.12):1; sieving the mixture with a 10-mesh sieve; drying the sieved mixture; and sieving the dried mixture with a 20-mesh sieve. The optimal weight ratio of the water to the acidic potassium citrate is (0.06-0.08):1. The product prepared by the preparation method disclosed by the invention has good uniformity and can not segregate and agglomerate in the processes of transportation and preservation, and the gold loss is small in the process of preparation.

Description

technical field [0001] The invention relates to a preparation method of gold salt for gold plating, in particular to a preparation method of gold potassium citrate for electroplating or chemical gold plating, which is mainly applicable to acid and neutral gold plating processes. Background technique [0002] Gold plating has a wide range of applications in industry. The most widely used gold plating processes are acid and neutral gold plating. Potassium aurous cyanide (commonly known as gold salt) is usually used as the main salt in acidic and neutral gold plating processes (for details, see "Surface Treatment Process Encyclopedia", edited by Liu Yubo, page 290, first edition in May 1996). In the existing gold-plating process, potassium aurous cyanide is added according to the consumption of gold. However, in actual gold-plating production, due to the consumption of the electrode reaction, the washing loss of the gold-plated workpiece causes the gold and citrate in the plat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/48
Inventor 张东山
Owner 张东山
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