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Production method of copper sulfate

A production method, copper sulfate technology, applied in the direction of copper sulfate, etc., can solve the problems of not meeting the copper sulfate electroplating grade standard, containing more impurities and metal ions, and the quality of crude copper sulfate is not up to standard, so as to avoid unstable reaction, Ease of filtration and high recovery rate

Active Publication Date: 2018-07-31
东莞市恒建环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the electroplating-grade copper sulfate used as an electroplating additive is almost always produced from copper-containing etching waste liquid of circuit boards. However, the crude copper sulfate produced by the traditional copper sulfate production process is not up to standard and contains many impurities and Ionic, does not meet plating grade standards for copper sulfate

Method used

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  • Production method of copper sulfate

Examples

Experimental program
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Embodiment 1

[0062] 1. Removal of impurities in acidic etching waste liquid:

[0063] Add 5m3 tap water in the sodium chlorate dispensing tank, then add 2 tons of solid sodium chlorate, stir to be mixed with sodium chlorate solution.

[0064] Start the acid etching waste liquid lifting pump, start the press filtration, the filtrate produced overflows to the acid etching waste hydraulic pressure filter tank, and lifts the filtrate to the acid etching waste liquid purification tank through the filter pressure tank lifting pump for purification treatment.

[0065] Turn on the mixer, add sodium chlorate solution to the acid etching waste liquid purification tank to remove the Cu in the acid etching waste liquid + , Fe 2+ Oxidized to Cu 2+ , Fe 3+ , according to the color of the acidic etching waste liquid to judge the oxidation end point, when the acidic etching waste liquid is green and transparent, it is the oxidation end point, and there is no need to continue to add sodium chlorate soluti...

Embodiment 2

[0097] Embodiment 2 is substantially the same as Example 1, except that the basic cupric chloride mother liquor produced in Example 1 replaces the tap water in Example 1.

Embodiment 3

[0099] Embodiment 3 is basically the same as Embodiment 2, the difference lies in the following aspects:

[0100] 1), in the step of removing impurities in the acidic etching waste liquid, adding ammonia water to the purification tank will adjust the pH value of the acidic etching waste liquid to be different, the pH value of embodiment 2 is 1.8, and the pH value of embodiment 3 is 1.9.

[0101] 2) The raw materials are different, specifically:

[0102] The Baume degree of the acidic etching waste liquid before impurity removal is 27Be°, the pH value is -0.5, the Baume degree after the impurity removal is 26Be°, and the pH value is 1.5;

[0103] The Baume degree of the alkaline etching waste liquid before impurity removal is 16Be°, and the pH value is 10.5, and the Baume degree after impurity removal is 15Be°, and the pH value is 9.0.

[0104] 3) The preheating temperature is different, specifically: the preheating temperature of Example 2 is 45°C, and the preheating temperat...

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Abstract

The invention discloses a production method of copper sulfate. The production method comprises the following steps: adding an oxidizing agent into an acid etching waste solution to oxidize cuprous ions and ferrous ions in the acid etching waste solution; then regulating a pH value to reach 1.7 to 1.9 and carrying out stirring and reaction; then adding activated carbon again; performing settlementlayering and taking supernatant liquid to perform filtration to obtain an impurity-removed acid etching waste solution; adding soluble magnesium salt into an alkali etching waste solution and carryingout stirring and reaction; then performing settlement layering and taking supernatant liquid to obtain an impurity-removed alkali etching waste solution; performing mixed reaction on the impurity-removed acid etching waste solution and the impurity-removed alkali etching waste solution to obtain basic copper chloride; converting basic copper chloride ammonia into copper hydroxide; then performingfiltration on copper hydroxide, washing and purifying copper hydroxide and pulping copper hydroxide; then adding sulfuric acid to be acidified until pH is 0.5 to 1.0; then performing heat filtration,cooling crystallization, solid-liquid separation and drying treatment to obtain copper sulfate. Copper sulfate produced by the method can reach electroplating grade standard; moreover, a recovery ratio of copper in the etching waste solutions is high.

Description

technical field [0001] The invention relates to a production method of copper sulfate, which belongs to the technical field of copper sulfate production technology. Background technique [0002] Etching waste liquid is produced during the process of dissolving copper by chemical corrosion in the etching process of printed circuit board (PCB). According to its acidity and alkalinity, it can be further divided into acidic etching waste liquid and alkaline etching waste liquid. The copper content in the acidic etching waste liquid is about 30g / L-160g / L, and the copper content in the alkaline etching waste liquid is about 40g / L-170g / L. [0003] With the rapid development of the electronics industry, tens of thousands of tons of etching waste liquid are produced in my country every year. If these etching waste liquids are not properly treated and utilized, they will cause serious environmental pollution and great economic waste. The usual treatment method in China is: extracting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/10
CPCC01G3/10C01P2006/80
Inventor 刘志雄陈雪平
Owner 东莞市恒建环保科技有限公司
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