Environmental-friendly preparation method of high-purity cuprous cyanide

A cuprous cyanide, environment-friendly technology, applied in the direction of metal cyanide, etc., can solve the problems of three wastes pollution, failure to give high-purity cuprous cyanide preparation steps, high production cost, etc., and achieve the effect of full absorption

Inactive Publication Date: 2018-03-06
杭州青化社化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Cuprous cyanide is the main raw material for copper plating and electroplating liquefaction. At present, the main production method at home and abroad is "sodium sulfite circulation method". The production cost of this method is high, the process flow is long, and there are three wastes. Industrial sodium cyanide, copper oxide and hydrochloric acid are used as raw materials to produce cuprous cyanide, which has completely changed the traditional process route, simplified the process flow, reduced production costs, and reduced pollution, but it introduced inorganic acids and failed to give Preparation steps of high-purity cuprous cyanide

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Embodiment 1

[0022] An environment-friendly preparation method of high-purity cuprous cyanide, the preparation steps are as follows:

[0023] (1) Put the copper wire into the primary reaction tank, add 25% (mass fraction) NaCl aqueous solution, and pass chlorine gas for 15 minutes, the temperature of the reaction tank is 25°C, the reaction generates NaCuCl2, and the excess chlorine gas is passed into the secondary reaction tank ;

[0024] (2) Introduce the NaCuCl2 solution into the precipitation tank, add the NaCN solution, and react for 28 minutes to obtain CuCN precipitation. After filtering, the filtrate is returned to the reaction tank;

[0025] (3) After washing with sodium chloride solution, washing with water, concentrating, crystallizing, centrifuging and drying, the product is obtained, and the purity of the product is 99.92%.

[0026] As a preference, a rock wool insulation layer is arranged outside the reaction tank.

[0027] Preferably, the volume of the copper wires accounts...

Embodiment 2

[0041] An environment-friendly preparation method of high-purity cuprous cyanide, the preparation steps are as follows:

[0042] (1) Put the copper wire into the primary reaction tank, add 20% (mass fraction) NaCl aqueous solution, and pass chlorine gas for 20 minutes, the temperature of the reaction tank is 30°C, the reaction generates NaCuCl2, and the excess chlorine gas is passed into the secondary reaction tank and a three-stage reaction tank;

[0043] (2) Introduce the NaCuCl2 solution into the precipitation tank, add the NaCN solution, and react for 30 minutes to obtain the CuCN precipitate. After filtering, the filtrate is returned to the reaction tank;

[0044] (3) After washing with sodium chloride solution, washing with water, concentrating, crystallizing, centrifuging and drying, the product is obtained, and the purity of the product is 99.89%.

[0045] As a preference, a rock wool insulation layer is arranged outside the reaction tank.

[0046] Preferably, the vo...

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Abstract

The invention discloses an environmental-friendly preparation method of high-purity cuprous cyanide. The method comprises the following preparation steps: (1) adding a copper wire into a reaction tank, adding an aqueous solution of NaCl, introducing chlorine for a period of time, and reacting to produce NaCuCl2; (2) introducing the NaCuCl2 solution into a precipitation tank, adding a NaCN solutionto obtain a CuCN precipitate, filtering, and returning the filtrate to the reaction tank; (3) scrubbing and washing with a sodium chloride solution, and dewatering, thereby obtaining the product. According to the method disclosed by the invention, the copper wire, industrial chlorine as well as industrial sodium chloride and sodium cyanide serve as raw materials, and due to the steps of chloridizing, precipitating, washing, dewatering and the like, the high-purity cuprous cyanide powder can be obtained, and the highest purity can reach 99.92%.

Description

technical field [0001] The invention belongs to the field of cuprous cyanide preparation, in particular to an environment-friendly preparation method of high-purity cuprous cyanide. Background technique [0002] Cuprous cyanide is the main raw material for copper plating and electroplating liquefaction. At present, the main production method at home and abroad is "sodium sulfite circulation method". The production cost of this method is high, the process flow is long, and there are three wastes. Industrial sodium cyanide, copper oxide and hydrochloric acid are used as raw materials to produce cuprous cyanide, which has completely changed the traditional process route, simplified the process flow, reduced production costs, and reduced pollution, but it introduced inorganic acids and failed to give Preparation steps of high-purity cuprous cyanide. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an environment-frie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/08
CPCC01C3/08C01P2006/80
Inventor 张信勇
Owner 杭州青化社化工有限公司
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