Method for treating wastewater in production of corrosion foil for aluminum electrolytic capacitor

A technology for aluminum electrolytic capacitors and waste water production, which is applied in multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of secondary environmental pollution, high cost, and high operating cost of waste water treatment systems, and achieve creative Economic benefits, the effect of huge economic benefits

Active Publication Date: 2016-06-08
淮北恒正电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the materials used in this process are fine CaO and NaOH, the cost is high, and the CaSO produced in the process 4 , Al(OH) 3 And the mixed sediment of insoluble matter in fine CaO, not only h

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for treating waste water produced by corroded foil for aluminum electrolytic capacitors, comprising the following steps:

[0025] (1) Hydrochloric acid and AlCl produced by secondary corrosion in the production of corroded foil for aluminum electrolytic capacitors 3 The waste water is injected into the primary reaction pool, the waste water containing sulfuric acid, hydrochloric acid and its aluminum salts produced by the primary corrosion is injected into the secondary reaction pool, and the waste water containing nitric acid and its aluminum salts produced after post-treatment is injected into the fourth-stage reaction pool;

[0026] (2) Add CaCO to the primary reaction pool 3 , CaCO 3 AlCl is obtained after reaction with hydrochloric acid in solution 3 and CaCl 2 , react until the pH value of the wastewater solution is 2.5, filter, and remove excess CaCO 3 , the filtrate is AlCl 3 and CaCl 2 mixed solution;

[0027] (3) Add the filtrate in step (2) to...

Embodiment 2

[0032] A method for treating waste water produced by corroded foil for aluminum electrolytic capacitors, comprising the following steps:

[0033] (1) Hydrochloric acid and AlCl produced by secondary corrosion in the production of corroded foil for aluminum electrolytic capacitors 3 The waste water produced by the primary corrosion is injected into the primary reaction pool, the waste water containing sulfuric acid, hydrochloric acid and its aluminum salts produced by the primary corrosion is injected into the secondary reaction pool, and the waste water containing nitric acid and its aluminum salts produced after the post-treatment is injected into the fourth-stage reaction pool;

[0034] (2) Add CaCO to the primary reaction pool 3 , CaCO 3 AlCl is obtained after reaction with hydrochloric acid in solution 3 and CaCl 2 , react until the pH value of the wastewater solution is 3, filter, and remove excess CaCO 3 , the filtrate is AlCl 3 and CaCl 2 mixed solution;

[0035]...

Embodiment 3

[0040] A method for treating waste water produced by corroded foil for aluminum electrolytic capacitors, comprising the following steps:

[0041] (1) Hydrochloric acid and AlCl produced by secondary corrosion in the production of corroded foil for aluminum electrolytic capacitors 3 The waste water produced by the primary corrosion is injected into the primary reaction pool, the waste water containing sulfuric acid, hydrochloric acid and its aluminum salts produced by the primary corrosion is injected into the secondary reaction pool, and the waste water containing nitric acid and its aluminum salts produced after the post-treatment is injected into the fourth-stage reaction pool;

[0042] (2) Add CaCO to the primary reaction pool 3 , CaCO 3 AlCl is obtained after reaction with hydrochloric acid in solution 3 and CaCl 2 , react until the pH value of the wastewater solution is 3.5, filter, and remove excess CaCO 3 , the filtrate is AlCl 3 and CaCl 2 mixed solution;

[004...

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PUM

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Abstract

The invention provides a method for treating wastewater in production of corrosion foil for an aluminum electrolytic capacitor. The method comprises the following steps: (1) injecting wastewater produced in the production of the corrosion foil for the aluminum electrolytic capacitor into a second-order reaction tank, a first-order reaction tank and a fourth-order reaction tank respectively according to the generation order; (2) adding CaCO3 to the first-order reaction tank to regulate the pH value to 2 to 4, and filtering; (3) adding the filtrate in step (2) to the second-order reaction tank, and filter pressing; (4) injecting the filtrate in step (3) to a third-order reaction tank, adding Al2O3 to regulate the pH value of a solution to 2 to 4, and filtering by an ultrafiltration membrane; (5) adding Al2O3 to the fourth-order reaction tank to regulate the pH value of a solution to 2 to 4, filtering by an ultrafiltration membrane, and concentrating by heating. The method has the advantages that the cost is low, the treated wastewater can be discharged directly, and CaSO4, Al (NO3) 3 and a concentrated AlCl3 solution produced in the treatment process have relatively high purity, and can be used as industrial raw materials to be directly sold.

Description

Technical field [0001] The present invention is the field of wastewater treatment technology, which involves a method of making wastewater treatment for a corrosive foil for an aluminum electrolytic capacitor. Background technique [0002] Aluminum electrolytic capacitors use a variety of acids during the production process of corrosive foil, and at the same time produce aluminum salt. For example, during the first -level corrosion process, hydrochloric acid and sulfuric acid should be used to react with aluminum reactions.Aluminum salt is generated; nitric acid is also used during the process of treatment, so the wastewater produced in the production process contains a large amount of sulfuric acid, hydrochloric acid, nitric acid, and aluminum salt from other people.A big influence. [0003] At present, the processing method of the wastewater is to collect the concentrated collection of sulfuric acid, hydrochloric acid, nitric acid and other aluminum salt, enter the reaction poo...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01F11/46C01F7/56C01F7/66
CPCC01F7/56C01F7/66C01F11/46C02F1/001C02F1/444C02F1/66C02F9/00C02F2301/08
Inventor 李振龙田文海李刚
Owner 淮北恒正电子材料有限公司
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