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Resourceful treatment process of waste acid

A treatment process and recycling technology, applied in the field of waste acid recycling treatment process, can solve the problems of low value of polyaluminum sulfate products, and achieve the effect of increasing acid recovery rate, reducing waste and high value

Active Publication Date: 2019-09-10
苏州富淼膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology uses chemical reaction, although polyaluminum sulfate product is finally obtained, but the value of polyaluminum sulfate product is low

Method used

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  • Resourceful treatment process of waste acid
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  • Resourceful treatment process of waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] See figure 1 , the waste acid recycling process of the present embodiment comprises the following steps:

[0031] Step 1: Use the acid-resistant nanofiltration process to filter the corrosion waste acid solution to remove Al in the waste acid 3+ , to obtain permeate and concentrate. The molecular weight cut-off of the nanofiltration membrane in the acid-resistant nanofiltration process is 150Da-300Da, the operating pressure of the nanofiltration membrane is 2.0MPa-6.0MPa, and the operating temperature is 20°C-35°C. The permeate is recycled acid that meets the reuse standard and can be recycled. The relevant data after acid-resistant nanofiltration process are shown in the following table:

[0032] Test items Total acid (mol / L) Al 3+ Concentration (mol / L)

Waste acid stock solution 5.298 0.446 recovery acid 4.862 0.014 Nanofiltration Membrane Concentrate 5.854 0.778

[0033] The recovery rate of nanofiltration membrane to aci...

Embodiment 2

[0044] The recycling process of waste acid of the present embodiment comprises the following steps:

[0045] Step 1: Use the acid-resistant nanofiltration process to filter the corrosion waste acid solution to remove Al in the waste acid 3+ , to obtain permeate and concentrate. The molecular weight cut-off of the nanofiltration membrane in the acid-resistant nanofiltration process is 150Da-300Da, the operating pressure of the nanofiltration membrane is 2.0MPa-6.0MPa, and the operating temperature is 20°C-35°C. The permeate is recycled acid that meets the reuse standard and can be recycled. The relevant data after acid-resistant nanofiltration process are shown in the following table:

[0046] Test items Total acid (mol / L) al 3+ Concentration (mol / L)

Waste acid stock solution 6.323 0.266 recovery acid 5.782 0.008 Nanofiltration Membrane Concentrate 6.852 0.464

[0047] The recovery rate of nanofiltration membrane to acid is 50%, and...

Embodiment 3

[0057] The recycling process of waste acid of the present embodiment comprises the following steps:

[0058] Step 1: Use the acid-resistant nanofiltration process to filter the corrosion waste acid solution to remove Al in the waste acid 3+ , to obtain permeate and concentrate. The molecular weight cut-off of the nanofiltration membrane in the acid-resistant nanofiltration process is 150Da-300Da, the operating pressure of the nanofiltration membrane is 2.0MPa-6.0MPa, and the operating temperature is 20°C-35°C. The permeate is recycled acid that meets the reuse standard and can be recycled. The relevant data after acid-resistant nanofiltration process are shown in the following table:

[0059] Test items Total acid (mol / L) al 3+ Concentration (mol / L)

Waste acid stock solution 8.530 0.330 recovery acid 7.828 0.010 Nanofiltration Membrane Concentrate 9.425 0.575

[0060] The recovery rate of nanofiltration membrane to acid is 50%, and...

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Abstract

The invention discloses a resourceful treatment process of a waste acid. The resourceful treatment process comprises the following steps: I, carrying out treatment with an acid-resistant nanofiltration process+diffusion dialysis process, and carrying out acid recycling; II, adding an ammonium hydroxide solution into a dialysis raffinate of the diffusion dialysis process, carrying out a sufficientreaction so as to obtain ammonium aluminum sulfate precipitate and an ammonium salt solution with mixed ammonium sulfate and ammonium chloride, and carrying out a centrifugal separation process to separate the ammonium aluminum sulfate precipitate from the ammonium salt solution; III, carrying out washing, drying and calcining processes on the ammonium aluminum sulfate precipitate so as to obtainelectron (gemstone)-grade aluminum oxide; IV, treating the electron (gemstone)-grade aluminum oxide by using a reverse osmosis+electrodialysis process; and IV, treating concentrated water generated inthe electrodialysis process by using an evaporation crystallization technique, so as to obtain a product of ammonium sulfate and ammonium chloride. By adopting the resourceful treatment process, circulation use of 90% or greater of acids in a waste acid liquid can be achieved, meanwhile, the electron (gemstone)-grade aluminum oxide can be prepared, and very high values can be made.

Description

technical field [0001] The invention relates to a process for recycling waste acid. Background technique [0002] Aluminum electrolytic capacitors are widely used in household appliances, computers, communications, industrial controls, electric vehicles, electric locomotives, and military and aerospace equipment. The production process of aluminum electrolytic capacitors includes aluminum foil corrosion, oxide film formation, aluminum foil cutting, etc. Among them, the key to determine the performance of aluminum electrolytic capacitors is to corrode the aluminum foil. The surface area of ​​the corroded aluminum oxide film is doubled, so that its capacity can be made large. At present, chemical etching is often used to expand the surface area of ​​aluminum foil. [0003] In the corrosion process of the electrode foil, the corrosion solution is mainly prepared by sulfuric acid and hydrochloric acid in a certain proportion. The aluminum foil is uniformly corroded electrochem...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01F7/02
CPCC01F7/02C02F1/04C02F1/38C02F1/441C02F1/442C02F1/4693C02F9/00C02F2001/007
Inventor 王伟叶圣武葛方明费建建刘行行
Owner 苏州富淼膜科技有限公司
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