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Preparation method of cyanide-free gold plating reagent sodium gold sulfite

A gold sodium sulfite, cyanide-free gold plating technology, applied in the chemical field, can solve the problems of low finished product, explosive, bad smell, etc., and achieve the effect of simple process and reducing chloride ions

Active Publication Date: 2016-05-11
烟台招金励福贵金属股份有限公司
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AI Technical Summary

Problems solved by technology

[0002] At present, the process of gold sodium sulfite is mainly direct reduction method of gold chlorate and Lei Jin reduction method, direct reduction method of gold chlorate, the process is difficult to control, the finished product is low, and the finished product contains a large amount of chloride ions, which affects the use of the product
Although the Lei Jin reduction method can remove chloride ions, but Lei Jin is a strong explosive, which is extremely explosive and difficult to operate. Moreover, the product continuously decomposes ammonia gas and smells bad.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] A kind of preparation method of cyanide-free gold plating reagent sodium gold sulfite, preparation process is:

[0018] (1) Gold rolling: put the gold bar with a purity of 99.99% on a tablet press for rolling, and press it into a block with a thickness of 2mm, and cut the block into ordinary cuboid gold blocks to obtain gold blocks a;

[0019] (2) Cleaning the gold nugget: the gold nugget a in the process (1) is cleaned, first degreasing with ethanol for many times, and after degreasing, it is washed with deionized water for many times to obtain the gold nugget b;

[0020] (3) Gold dissolution: put the gold nugget b in the process (2) in the reaction kettle, add analytically pure hydrochloric acid, after adding hydrochloric acid, start to heat slowly, after heating to 45-50°C, slowly add 0.5L of analytically pure nitric acid , during the process of adding nitric acid, there will be yellow smoke in the condensation tube. After the yellow smoke disappears, repeat the pro...

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Abstract

The invention relates to a preparation method of a gold salt for gold plating, particularly a preparation method of a cyanide-free gold plating reagent sodium gold sulfite, belonging to the technical field of chemistry. The preparation method comprises the following steps: gold rolling, gold bullion cleaning, gold dissolution, nitre removal, solonization, solonization, cleaning, complexing reaction, and crystallization by concentration. The method has the advantages of simple technique and high safety, can not generate dangerous intermediates in the process, can effectively lower chlorine ions, and can be used for producing the odorless green environment-friendly product.

Description

technical field [0001] The invention relates to a preparation method of gold salt for gold plating, in particular to a preparation method of sodium gold sulfite, a cyanide-free gold plating reagent, and belongs to the field of chemical technology. Background technique [0002] At present, the processes of gold sodium sulfite mainly include gold chlorate direct reduction method and ray gold reduction method, gold chlorate direct reduction method, the process is difficult to control, the finished product is low, and the finished product contains a large amount of chloride ions, which affects the use of the product. Although the Lei Jin reduction method can remove chloride ions, but Lei Jin is a high explosive, extremely explosive, difficult to operate, and the product continuously decomposes ammonia gas, which has an unpleasant smell. Contents of the invention [0003] In order to solve the above problems, the present invention discloses a preparation method of sodium gold s...

Claims

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Application Information

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IPC IPC(8): C23C18/44C25D3/48C01G7/00
CPCC01G7/00C23C18/44C25D3/48
Inventor 朱振华谢卓森黄世盛
Owner 烟台招金励福贵金属股份有限公司
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