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Method for preparing copper nitrate from nitric acid stripping liquid

A technology of stripping liquid and copper nitrate, which is applied in the direction of copper nitrate, lead sulfate, process efficiency improvement, etc., can solve the problems of high nitrate content, environmental pollution, large consumption, etc., and achieve low price, simple process and easy operation Effect

Inactive Publication Date: 2018-04-20
长沙湘朴科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former method is to neutralize the nitric acid stripping solution with alkali to make the pH value reach more than 8, and produce copper hydroxide precipitation, which is dissolved in sulfuric acid after pressure filtration to obtain copper sulfate, or directly electrolyzed to obtain electrolytic copper, but this method consumes A large amount of alkali, the cost is high, and the content of nitrate in the treated wastewater is large, so it needs to be further treated; The copper is replaced, and then dried by a centrifuge to obtain coarse copper powder
This method produces a large amount of waste gas such as nitrogen monoxide, nitrogen dioxide, and water vapor during the production process, and the wastewater generated during the treatment process contains a large amount of nitrate and zinc ions. This method is not only costly, but also pollutes the environment.

Method used

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  • Method for preparing copper nitrate from nitric acid stripping liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Table 1 is the chemical composition of the waste electronic circuit board polymetallic powder used in Example 1:

[0046] Table 1 Chemical compositions of polymetallic powders from waste electronic circuit boards (%)

[0047] element

Cu

Fe

sn

Pb

Au

Ag

Al

Zn

W / %

73.22

1.12

10.1

8.71

0.001

0.03

6.25

0.57

[0048] (1) Leaching

[0049] Using nitric acid stripping liquid as raw material, add 200 kg of waste electronic circuit board polymetallic powder with the composition shown in Table 1 according to the liquid-solid ratio of 8:1, after reacting for 3 hours, filter and separate to obtain copper nitrate solution and filter residue, wash and dry SnO in the filter residue 2 The content is 65.28% (calculated as tin).

[0050] The composition of the copper nitrate solution is: Cu 2+ =82.56 / L,Pb 2+ =26.36g / L, Fe 3+ =3.5mg / L.

[0051] (2) Lead removal

[0052] Add the copper nitrate solution that s...

Embodiment 2

[0057] Table 2 is the copper rice chemical composition used in the embodiment two:

[0058] Table 2 Chemical composition of copper rice

[0059] element

Cu

Ni

sn

Pb

Al

Zn

W / %

88.26

1.12

6.1

2.32

1.25

0.95

[0060] (1) Leaching

[0061] Using nitric acid stripping liquid as raw material, add 300 kg of copper rice with the composition shown in Table 2 according to the liquid-solid ratio of 9:1. After reacting for 4 hours, filter and separate to obtain copper nitrate solution and filter residue. SnO in the filter residue after washing and drying with water 2 The content is 68.65% (calculated as tin).

[0062] The composition of the copper nitrate solution is: Cu 2+ =78.26 / L, Pb 2+ =21.65g / L.

[0063] (2) Lead removal

[0064] Add the copper nitrate solution that step 1 obtains to 1.5 times of theoretical amount of sulfuric acid, filter and wash after reacting for 3h, and the copper nitrate solution composition tha...

Embodiment 3

[0069] Table 3 is the chemical composition of the circuit board electronic pin waste used in Example 3:

[0070] Table 3 Chemical composition of circuit board electronic pin waste

[0071] element

Cu

Fe

sn

Pb

Al

Zn

W / %

59.6

13.12

16.3

9.25

0.78

0.95

[0072] (1) Leaching

[0073] Using nitric acid stripping liquid as raw material, add 500 kg of circuit board electronic pin waste with the composition shown in Table 3 according to the liquid-solid ratio of 10:1. After reacting for 5 hours, filter and separate to obtain copper nitrate solution and filter residue, wash and dry the filter residue SnO 2 The content is 63.26% (calculated as tin).

[0074] The composition of the copper nitrate solution is: Cu 2+ =76.25 / L, Pb 2+ =21.25g / L.

[0075] (2) Lead removal

[0076] Add the copper nitrate solution that step 1 obtains to 1.3 times of theoretical amount of sulfuric acid, filter and wash after reacting for 3h, and...

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Abstract

The invention relates to a method for resource treatment by using a nitric acid stripping liquid, and in particular relates to a method for preparing copper nitrate from the nitric acid stripping liquid. The method for preparing the copper nitrate by using the nitric acid stripping liquid is characterized by comprising the following steps: (1) performing leaching: using the nitric acid stripping liquid as a leaching solvent, adding a copper-containing electronic material for leaching, and after a leaching reaction is finished, performing solid-liquid separation to obtain a leaching liquid andtin slag; (2) removing lead: adding dilute sulfuric acid to the leaching liquid for removing the lead, and performing solid-liquid separation to obtain a copper nitrate solution and a lead sulfate precipitate; and (3) performing crystallization: performing crystallization on the copper nitrate solution to obtain industrial-grade copper nitrate. The method provided by the invention adopts the nitric acid stripping liquid and the copper-containing electronic material as raw materials to realize the resource recovery of tin and the lead, so as to obtain the tin slag and industrial-grade lead sulfate, and then crystallization purification is performed on the copper nitrate solution to obtain the industrial-grade copper nitrate. The method provided by the invention is simple in process, saves energy, protects environments, has high added value, and achieves the effects of turning waste into treasure and promoting resource benefits.

Description

technical field [0001] The invention relates to a method for preparing copper nitrate, in particular to a method for preparing copper nitrate with nitric acid stripping solution. Background technique [0002] The nitric acid stripping solution mainly comes from circuit board enterprises. In the copper plating method, high-concentration nitric acid is used to deplat the hanger. It is produced by the reaction of copper and nitric acid, and mainly contains copper nitrate. This kind of waste water is classified as hazardous waste and belongs to HW22 category. The copper ion concentration and nitric acid content are relatively high, which is very harmful to the environment. Currently, the commonly used treatment methods for nitric acid stripping liquid include acid-base neutralization and zinc powder replacement. Law. The former method is to neutralize the nitric acid stripping solution with alkali to make the pH value reach more than 8, and produce copper hydroxide precipitatio...

Claims

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Application Information

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IPC IPC(8): C01G3/08C01G21/20C22B25/06
CPCC01G3/08C01G21/20C01P2006/80C22B25/04C22B25/06Y02P10/20
Inventor 曹兴
Owner 长沙湘朴科技有限公司
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