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Zero emission recovery treatment method and system for corrosion waste acid in aluminum foil industry

A recycling and industrial technology, applied in the field of zero-emission recycling and processing method and system of corrosion waste acid in aluminum foil industry, to achieve the effect of high recovery rate and eliminate the possibility of polluting the environment

Active Publication Date: 2014-06-25
WENZHOU UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the waste acid is completely converted into a useful chemical raw material, the problem of waste acid discharge is completely solved

Method used

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  • Zero emission recovery treatment method and system for corrosion waste acid in aluminum foil industry
  • Zero emission recovery treatment method and system for corrosion waste acid in aluminum foil industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Treatment of corrosion waste hydrochloric acid produced in the production of low-voltage electronic aluminum foil. In a low-pressure foil production line of a manufacturer, about 6.5mol / L HCl is used to corrode the light foil, and the corrosion waste acid 201 produced is composed of H + 4.70mol / L, Al 3+ 0.60mol / L, Cl - 6.48mol / L. Diffusion dialyzer 101 adopts a plate and frame clamping structure, with a flow channel length of 1.7m and a thickness of 0.9mm. The ion exchange membrane used is DF-120 (Shandong Tianwei Membrane Technology Co., Ltd.), and the flow intensity of 201 and 202 is controlled to 1.25L / (m 2 h), the waste salt solution 203 flow rate obtained at this time is 1.41L / (m 2 h), the composition is H + 0.62mol / L, Al 3+ 0.489mol / L, Cl - 2.09mol / L, the reclaimed acid 204 flow rate is 1.09L / (m 2 h), the composition is H + 4.55mol / L, Al 3+ 0.048mol / L, Cl - 4.70mol / L. Take about 1% of recovered acid 204 as bipolar membrane recovery mother so...

Embodiment 2

[0027] Example 2: The diffusion dialysis part is the same as in Example 1. In the bipolar membrane electrodialysis, the bipolar membrane model is BPM-I (Beijing Tingrun Membrane Technology Development Co., Ltd.), and the anion membrane model is JAM-II (Beijing Tingrun Membrane Technology Development Co., Ltd.) Membrane Technology Development Co., Ltd.), the cationic membrane model is CR64 (GE Ionics), using 50 repeating units. When electrodialysis works, the current density is 20mA / cm 2 , choose 0.2mol / L H as the electrode chamber liquid 2 SO 4 solution. The degree of alkalinization of the bipolar membrane electrodialysis pair 203 can be controlled according to the electricity passing through the membrane stack. When the electricity passing through the membrane stack is controlled to be 2030.75 moles of electrons per liter of waste salt solution, the free acid in 203 is just completely neutralized to obtain a pure aluminum chloride solution 209 with a solution alkalinity of...

Embodiment 3

[0028] Example 3: The diffusion dialysis part is the same as in Example 1. In the bipolar membrane electrodialysis, the anion exchange membrane is AR204 (GEIonics), the cation exchange membrane is CR67 (GE Ionics), and one repeating unit is used. Transfer all the recovered acid 204 to 206, and adjust the amount of pure water 207 mixed with 206 to obtain 208 to 0, that is, 204, 206 and 208 have the same composition, and they are all acids recovered by diffusion dialysis. When electrodialysis works, the current density is 100mA / cm 2 , choose 1.0mol / L H as the electrode chamber liquid 2 SO 4 solution. Control the electricity passing through the bipolar membrane electrodialysis membrane stack to be 2031.04 moles of electron electricity per liter of waste salt solution. At this time, the free acid in 203 is just completely neutralized to obtain pure aluminum salt 209 with a concentration of 0.50 mol / L; and At the same time, the concentration of the second recovered acid obtained...

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Abstract

The present invention provides a zero emission recovery treatment method for corrosion waste acid in an aluminum foil industry. With the method, free acids and aluminum resources in corrosion waste acid can be separated in a pure free acid and aluminum salt or polymeric aluminum salt form, and any new contaminant emissions can not be generated, wherein the separated pure free acid can be directly reused for aluminum foil corrosion production, and the recovered aluminum salt or polymeric aluminum salt can be adopted as a useful base chemical raw material so as to be directly sold. The present invention further provides a zero emission recovery treatment system for corrosion waste acid in an aluminum foil industry, wherein the system comprises a diffusion dialyzator and a bipolar membrane electrodialyzer. According to the present invention, original corrosion waste acid and pure water adopted as a recovered acid receiving solution are pumped into the diffusion dialyzator in a reverse flow manner to obtain the first part of recovered acid and a waste salt solution liquid stream, and then the waste salt solution liquid stream and the other recovered acid receiving solution are pumped into the bipolar membrane electrodialyzer; and with the treatment of the recovery system, the corrosion waste acid can be completely converted into the recovered acid and the pure aluminum salt or polymeric aluminum salt so as to be recycled.

Description

technical field [0001] The invention relates to a method and system for treating high-concentration waste hydrochloric acid, waste sulfuric acid, waste nitric acid and their mixed waste acids produced in the corrosion section of the capacitor foil industry, and specifically relates to a zero-emission recycling treatment method for corrosion waste acids in the aluminum foil industry and its system. Background technique [0002] The production process of anode foil for electrolytic capacitors mainly includes corrosion and formation steps. The main purpose of the etching section is to form orderly corrosion pits on the surface of the light foil to increase its surface area, thereby increasing the capacitance of the finished foil. The corrosion process is completed under the action of acid. Currently, the widely used acid is mainly HCl, H 2 SO 4 , HNO 3 and its mixed acids. After the light foil enters the corrosion tank, it contacts with these free acids, a chemical reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/46C02F9/06C02F1/469
Inventor 张伟明陈庆宋卫国万立骏马坤松张椿年
Owner WENZHOU UNIVERSITY