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Zero-discharge treatment method for recycling and utilization of aluminum foil formation ammonium adipate wastewater

An ammonium adipate and recycling technology, applied in the field of capacitor aluminum foil production, can solve the problems of waste water discharge process, complexity, and inability to achieve low-cost zero-discharge, etc., to achieve the effect of zero-discharge treatment for recycling and reuse

Inactive Publication Date: 2020-02-07
YANGZHOU HONGYUAN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, patents such as CN103508596A and 200710125602.X disclose a clear ammonium adipate wastewater treatment system, which only performs acidification, filtration and recovery of adipic acid in ammonium adipate cleaning wastewater, but there is still wastewater discharge and the process is complicated. Unable to achieve low cost and zero emissions

Method used

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  • Zero-discharge treatment method for recycling and utilization of aluminum foil formation ammonium adipate wastewater

Examples

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Effect test

Embodiment example 1

[0021] This process was used to treat the ammonium adipate waste liquid of an aluminum foil company's chemical production line, and the concentration of ammonium adipate was about 0.5mol.L through detection -1 , first add ammonia water to adjust the pH value between 6.5 and 8.0, stir to precipitate alumina and filter through a 2-micron PP cotton core to reduce the concentration of aluminum ions in the waste liquid, and then add 1mol.L to the ammonium adipate waste liquid -1 The HCl solution was stirred while adding a small amount of adipic acid crystals as seeds. Then, adipic acid is separated by filtration, and the waste liquid is processed by bipolar membrane electrodialysis, and the concentration of HC obtained by bipolar membrane electrodialysis treatment is 0.45mol.L -1 , In addition, react the obtained ammonia water with adipic acid to obtain ammonium adipate, dissolve the obtained ammonium adipate and use diffusion dialysis to purify, the flow intensity is 10L / (h m 2 )...

Embodiment example 2

[0023] This process was used to treat the ammonium adipate waste liquid of an aluminum foil company's chemical production line, and the concentration of ammonium adipate was about 0.4mol.L through detection. -1 , first add ammonia water to adjust the pH value between 6.5 and 8.0, stir to precipitate alumina and filter through a 2-micron PP cotton core to reduce the concentration of aluminum ions in the waste liquid, and then add 0.5mol.L to the ammonium adipate waste liquid -1 The HCl solution was stirred while adding a small amount of adipic acid crystals. Then adipic acid is separated by filtration, and the waste liquid is processed by bipolar membrane electrodialysis, and the concentration of HC obtained by bipolar membrane electrodialysis treatment is 0.35mol.L -1 , In addition, react the obtained ammonia water with adipic acid to obtain ammonium adipate, dissolve the obtained ammonium adipate and use diffusion dialysis to purify, the flow intensity is 10L / (h m 2 ), initi...

Embodiment example 3

[0025] This process was used to treat the ammonium adipate waste liquid of an aluminum foil company's chemical production line, and the concentration of ammonium adipate was about 0.65mol.L through detection. -1 , first add ammonia water to adjust the pH value between 6.5 and 8.0, stir to precipitate alumina and filter through a 2-micron PP cotton core to reduce the concentration of aluminum ions in the waste liquid, and then add 1mol.L to the ammonium adipate waste liquid -1 The HCl solution was stirred while adding a small amount of adipic acid crystals. Then adipic acid is separated by filtration, and the waste liquid produced is treated by bipolar membrane electrodialysis, and the concentration of HC obtained by bipolar membrane electrodialysis treatment is 0.5mol.L -1 , In addition, the obtained ammonia water and adipic acid are reacted to obtain ammonium adipate, and after the obtained ammonium adipate is dissolved, the diffusion dialysis method is used for purification ...

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Abstract

The invention discloses a zero-discharge treatment method for recycling and utilization of aluminum foil formation ammonium adipate wastewater. The method comprises the following steps: adding an acidliquid into ammonium adipate wastewater, performing acidification treatment, and performing solid-liquid separation so as to obtain an adipic acid crystal and ammonia-containing wastewater; performing ion separation on the ammonia-containing wastewater by using an electric drive membrane method, performing recycling so as to obtain an acid liquid and ammonia water, and circulating and recycling the acid liquid to acidify adipic acid wastewater; mixing and reacting the adipic acid crystal with the ammonia water so as to obtain an ammonium adipate solution; concentrating and refining the ammonium adipate solution by using a pressure drive membrane method so as to obtain a refined ammonium adipate solution, and circulating and recycling the refined ammonium adipate solution to aluminum foilformation; and performing an ion exchange method on a waste liquid generated from concentration and refining of the ammonium adipate solution so as to obtain an ammonium salt solution, conveying the ammonium salt solution to an electric drive membrane, and performing recycling. The method achieves zero-discharge recycling treatment on the ammonium adipate wastewater and is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of capacitor aluminum foil production, and in particular relates to the recovery and treatment technology of ammonium adipate waste water produced by the formation of capacitor aluminum foil. Background technique [0002] In the aluminum electrolytic capacitor corrosion method, hydrochloric acid is often used to etch the aluminum foil, and the aluminum foil is corroded and dissolved by hydrochloric acid to form a porous corrosion film. After corrosion, the aluminum foil was washed with water to remove Cl - and surface aluminum powder, it will produce Al-containing 3+ acidic wastewater, and the formation process is mainly to form a layer of dense and voltage-resistant γ-Al on the surface of the etched aluminum foil 2 o 3 The oxide film dielectric layer is generally used as the anode of the capacitor. The chemical forming liquids mainly used in the chemical forming process include ammonium adipate, organic...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/38C02F103/34
CPCC02F1/001C02F1/42C02F1/44C02F1/4693C02F1/5236C02F1/66C02F9/00C02F2001/5218C02F2101/38C02F2103/346C02F2301/043C02F2301/08
Inventor 杜明桂马坤松相志明王磊周鑫杨凯
Owner YANGZHOU HONGYUAN ELECTRONICS
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