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Preparation method of cuprous cyanide

A technology of cuprous cyanide and cuprous chloride, which is applied in the direction of metal cyanide, etc., can solve the problems of long process flow and high production cost, and achieve the effects of reducing production cost, reducing quality requirements and increasing reaction intensity

Pending Publication Date: 2020-07-10
宁波神化特种化学品集成有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of cuprous cyanide, the acquisition of cuprous chloride as an intermediate material is the most important factor in cost control. Using metal copper rice as a reducing agent to reduce bivalent copper has high production costs and a long process flow.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The present embodiment provides a kind of preparation method of cuprous cyanide, comprises the following steps:

[0021] (1) Add sodium chloride solution in the acidic etching solution to obtain the first solution; wherein, the acidic etching solution contains copper chloride, ammonia, ammonium chloride and supplementary components, and copper chloride provides Cu 2+ The supplementary components are cobalt chloride, sodium chloride, ammonium carbonate and ammonium phosphate, etc., to improve the characteristics of the acidic etching solution.

[0022] (2) Heating and stirring the first solution, and slowly introducing liquid sulfur dioxide to carry out the reaction of synthesizing cuprous chloride-sodium chloride complex, during the reaction, control the reaction temperature of the first solution to be 75°C .

[0023] Wherein, the reaction main equation of synthetic cuprous chloride-sodium chloride complex is:

[0024] 2CuCl 2 +2NaCl+SO 2 +2H 2 O=H 2 SO 4 +2Na[Cu...

Embodiment 2

[0029] The present embodiment provides a kind of preparation method of cuprous cyanide, comprises the following steps:

[0030] (1) Add copper oxide to the acid etching solution to obtain Cu-containing 2+ mother liquor, adding sodium chloride solution to the mother liquor to obtain the first solution; wherein, the acidic etching solution contains copper chloride, ammonia, ammonium chloride and supplementary components, and the supplementary components are cobalt chloride, sodium chloride, ammonium carbonate And ammonium phosphate, etc., to improve the characteristics of acidic etching solution.

[0031] (2) Heating and stirring the first solution, and slowly introducing liquid sulfur dioxide to carry out the reaction of synthesizing cuprous chloride-sodium chloride complex, during the reaction, control the reaction temperature of the first solution to be 80°C .

[0032] (3) When the first solution gradually becomes colorless, the end of the reaction is reached, and the feedi...

Embodiment 3

[0036] The present embodiment provides a kind of preparation method of cuprous cyanide, comprises the following steps:

[0037] (1) Add copper hydroxide to the acidic etching solution to obtain Cu-containing 2+ mother liquor, adding sodium chloride solution to the mother liquor to obtain the first solution; wherein, the acidic etching solution contains copper chloride, ammonia, ammonium chloride and supplementary components, and the supplementary components are cobalt chloride, sodium chloride, ammonium carbonate And ammonium phosphate, etc., to improve the characteristics of acidic etching solution.

[0038] (2) Heating and stirring the first solution, and slowly introducing liquid sulfur dioxide to carry out the reaction of synthesizing cuprous chloride-sodium chloride complex, during the reaction, control the reaction temperature of the first solution to be 85°C .

[0039] (3) When the first solution gradually becomes colorless, the end of the reaction is reached, and the...

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PUM

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Abstract

The invention discloses a preparation method of cuprous cyanide, and belongs to the technical field of cuprous cyanide preparation, and the preparation method comprises the following steps: adding sodium chloride into mother liquor containing Cu<2+> to obtain a first solution; heating and stirring the first solution, and introducing liquid sulfur dioxide for reaction to obtain a second solution containing a cuprous chloride-sodium chloride complex; adjusting the second solution to be alkaline, and then carrying out filter pressing treatment on the second solution to obtain a third solution; and adding a sodium cyanide solution into the third solution to obtain the cuprous cyanide. According to the method, the liquid sulfur dioxide replaces traditional metal copper to serve as a reducing agent, the activity of the liquid sulfur dioxide is high, copper ions can be reduced into cuprous ions, the production condition is strengthened, the production efficiency is improved, and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of cuprous cyanide preparation, in particular to a preparation method of cuprous cyanide. Background technique [0002] Cuprous cyanide is the main raw material for copper plating and electroplating liquefaction. At present, the production of cuprous cyanide usually adopts the cuprous chloride method. The raw material is copper chloride or a mixture containing copper oxide, and then it is reduced by using copper rice. Reducing the divalent copper in the mixture to generate cuprous chloride containing monovalent cupric, and the cuprous chloride reacts with sodium cyanide to produce cuprous cyanide. In the production process of cuprous cyanide, the acquisition of cuprous chloride as an intermediate material is the most important factor in cost control. Using metal copper rice as a reducing agent to reduce bivalent copper has high production costs and a long process flow. Contents of the invention [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/08
CPCC01C3/08
Inventor 袁维芳赵建平徐军陆尧
Owner 宁波神化特种化学品集成有限公司
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