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Method for producing basic copper chloride, cupric sulfate pentahydrate from copper-containing etching waste liquid

A technology of copper sulfate pentahydrate and etching waste liquid, applied in the field of production of basic copper chloride and copper sulfate

Active Publication Date: 2011-06-15
HUIZHOU DONGJIANG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] At present, the treatment methods of etching waste liquid mainly include chemical precipitation, solvent extraction, pyromelting, electrowinning, etc. These methods still have various defects, and any single method is difficult to realize the treatment of etching waste liquid. The goal of meeting the emission standards and recycling valuable metals and other useful components

Method used

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  • Method for producing basic copper chloride, cupric sulfate pentahydrate from copper-containing etching waste liquid
  • Method for producing basic copper chloride, cupric sulfate pentahydrate from copper-containing etching waste liquid

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0057] Production of basic copper chloride by using acidic and alkaline etching waste liquid.

[0058] The alkaline copper chloride etching waste liquid comes from circuit board factory A, and its phase analysis is shown in Table 5. The acidic copper chloride etching waste liquid comes from circuit board factory B, and its phase analysis is shown in Table 6.

[0059] Phase name

NH 3

Cu 2+

Cl -

other additives

Content g / l

120

90

78

6.5

[0060] table 5

[0061] Phase name

HCl

CuCl 2

CuCl

NaCl

NH 4 Cl

other additives

Content g / l

60

180

15

110

8.6

5.4

[0062] Table 6

[0063] The above materials are pretreated in their respective pretreatment tanks, that is, hydrogen peroxide, magnesium chloride, and polyferric are added successively to oxidize cuprous ions into divalent copper, and precipitate arsenate and arseni...

example 2

[0066] Copper sulfate is produced from basic copper chloride.

[0067] A company produces copper sulfate pentahydrate by alkali conversion reaction of basic copper chloride to obtain copper oxide, and then acidifies with sulfuric acid. Feeding amount: 2 tons of basic copper chloride, 3m 3 Crystallization mother liquor, 1 ton of tap water, 1.3 tons of sulfuric acid, the volume after reaction is about 5m 3 ; After crystallization, discharge at 45°C to obtain 2.6 tons of copper sulfate product. The crystallization rate of copper in copper sulfate is 60%. The obtained copper sulfate pentahydrate product reaches feed grade. The volume of mother liquor after crystallization is 4.5m 3 , the copper content is 120g / l, circulated to the acidification tank 3m 3 , back to the raw material pool 1.5m 3 ,Continuous production.

[0068] In the process of alkali conversion to produce copper oxide, the pH in the alkali conversion reactor is controlled between 9.0 and 10.5, and when the c...

example 3

[0070] Production of copper sulfate pentahydrate from sulfuric acid-hydrogen peroxide etching waste liquid.

[0071] A sulfuric acid-hydrogen peroxide etching waste solution from circuit board factory C, its phase analysis is shown in Table 7.

[0072] Phase name

H +

SO 4 2-

Cu 2+

other additives

Content g / l

1.5

260.0

48.5

6.5

[0073] Table 7

[0074] First add hydrogen peroxide, magnesium chloride, and polyiron to the pretreatment tank for pretreatment to remove cuprous ions and arsenic, then pump the material into the alkali conversion reaction kettle, add sodium hydroxide solution for neutralization reaction, and use pH electrode Control the respective flows, and the pH range is controlled between 9.0 and 10.0. After the reaction is completed, copper hydroxide precipitates are formed, press-filtered, washed, the filtrate is sent to the filtrate storage tank, and the filter cake is sent to the slurr...

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Abstract

The invention relates to a method for producing copper chloride hydroxide and blue vitriod by using cupriferous etching wastewater; the method comprises the following steps: acidic copper chloride etching wastewater and alkaline copper chloride etching wastewater are neutralized and crystallized to get acidic copper chloride crystal under the condition of strictly controlling filling liquid and the Ph range of a reaction kettle, and then pumped and filtrated, and centrifugated; part of the obtained alkaline copper chloride crystal is dried to obtain finished products while the other is added with NaOH solution for alkali conversion to obtain copper oxide, and then is acidulated by sulphuric acid, crystallized, washed, centrifugated, and dried to obtain blue vitriod products. The method for producing blue vitriod by directly using sulphuric acid-oxyful etching wastewater includes the following steps: sulphuric acid-oxyful etching wastewater and composition brass wasterwater in a PCB manufacture are blended together and added with NaOH to form cupric hydroxide precipitation which filtrated, washed, and then acidulated by sulphuric acid to obtain copper sulphate solution; after the copper sulphate solution is cooled, crystallized, centrifugated and dried, and the blue vitriod is obtained.

Description

[0001] Technical field The present invention relates to a method for recycling copper from copper-containing etching waste liquid, in particular to a method for producing basic copper chloride and copper sulfate from copper-containing etching waste liquid. technical background [0002] Printed circuit board is a basic component of electronic products, and its processing includes two important processes of printed circuit and etched circuit. In the etching process, a large amount of etching waste liquid is produced, the copper content is as high as tens or even hundreds of grams per liter, and it also contains other high-concentration pollutants, such as ammonia nitrogen, etc., with a high pollution coefficient. If it is directly discharged into the environment, it will not only cause waste of resources , and cause serious harm, it must be dealt with reasonably. [0003] The modern circuit board processing industry mainly uses four etching systems, namely hydrochloric acid-sodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G3/05C01G3/10C02F9/04C02F1/66
Inventor 王治军刘富强胡春林朱兆华陈曙生刁伟华邓华利
Owner HUIZHOU DONGJIANG ENVIRONMENTAL PROTECTION TECH
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