A method for recovering sulfuric acid from waste sulfuric acid containing hydrogen peroxide

A technology of hydrogen peroxide and waste sulfuric acid, which is applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems of unable to realize the recovery of sulfuric acid and the introduction of impurities, and achieve the effects of low cost, easy control of the reaction, and high efficiency

Active Publication Date: 2021-06-11
湖北永绍科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention solves the technical problem that the prior art method for recovering sulfuric acid from waste sulfuric acid containing hydrogen peroxide requires additional addition of alkaline reagents and cannot achieve sulfuric acid recovery, and introduces impurities. Method for recovering sulfuric acid from waste sulfuric acid of hydrogen peroxide

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  • A method for recovering sulfuric acid from waste sulfuric acid containing hydrogen peroxide
  • A method for recovering sulfuric acid from waste sulfuric acid containing hydrogen peroxide

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Effect test

Embodiment 1

[0031] A recovery treatment method for waste sulfuric acid, comprising the following steps:

[0032] Step A: collect the sulfuric acid waste liquid containing hydrogen peroxide, pass it into the electrolytic cell, and under the condition of no electricity, the anode performs the reaction of absorbing hydrogen peroxide;

[0033] Step B: under energized conditions, use the solution in step A as the electrolyte to perform electrolysis in the electrolytic cell to regenerate the lead dioxide anode;

[0034] Step C: Recycling the electrolytic solution that has been electrolyzed in Step B.

[0035] The concentration of sulfuric acid in the original waste liquid in step A is 0.5 mol / L, and the concentration of hydrogen peroxide is about 10.65 g / L.

[0036] The anode of the electrolytic cell in the step B is a titanium-based lead dioxide electrode, and the cathode is a carbon electrode; the current intensity is 5mA / cm 2 . After the electrolysis in the electrolyzer is completed, the ...

Embodiment 2

[0038] A method for reclaiming sulfuric acid from waste sulfuric acid containing hydrogen peroxide, comprising the following steps:

[0039] Step A: collect the sulfuric acid waste liquid containing hydrogen peroxide, pass it into the electrolytic cell, and under the condition of no electricity, the anode performs the reaction of absorbing hydrogen peroxide;

[0040] Step B: under energized conditions, use the solution in step A as the electrolyte to perform electrolysis in the electrolytic cell to regenerate the lead dioxide anode;

[0041] Step C: Recycling the electrolytic solution that has been electrolyzed in step B.

[0042] The concentration of sulfuric acid in the original waste liquid in step A is 0.5 mol / L, and the concentration of hydrogen peroxide is about 11.34 g / L.

[0043] The anode of the electrolytic cell in the step B is a titanium-based lead dioxide electrode, and the cathode is a carbon electrode; the current intensity is 10mA / cm 2 . After the electrolys...

Embodiment 3

[0045] A method for reclaiming sulfuric acid from waste sulfuric acid containing hydrogen peroxide, comprising the following steps:

[0046] Step A: collect the sulfuric acid waste liquid containing hydrogen peroxide, pass it into the electrolytic cell, and under the condition of no electricity, the anode performs the reaction of absorbing hydrogen peroxide;

[0047] Step B: under energized conditions, use the solution in step A as the electrolyte to perform electrolysis in the electrolytic cell to regenerate the lead dioxide anode;

[0048] Step C: Recycling the electrolytic solution that has been electrolyzed in step B.

[0049] The concentration of sulfuric acid in the original waste liquid in step A is 0.5 mol / L, and the concentration of hydrogen peroxide is about 10.51 g / L.

[0050] The anode of the electrolytic cell in the step B is a titanium-based lead dioxide electrode, and the cathode is a carbon electrode; the current intensity is 15mA / cm 2 . After the electrolys...

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Abstract

The invention discloses a method for recovering sulfuric acid from waste sulfuric acid containing hydrogen peroxide, which belongs to the field of environmental protection. Pour the waste liquid into the electrolytic cell. The anode in the electrolytic cell is titanium-based lead dioxide, and the cathode is a carbon electrode. In the absence of electricity, the lead dioxide on the anode undergoes a redox reaction with hydrogen peroxide and sulfuric acid. Generate lead sulfate, water and oxygen; the lead sulfate is attached to the anode; the anode and the cathode are respectively connected to the positive and negative poles of the DC power supply, so that electrolysis occurs in the electrolytic cell; the lead sulfate attached to the anode is oxidized, and the lead sulfate React with water to generate lead dioxide, sulfuric acid and hydrogen ions, so that lead dioxide and sulfuric acid can be regenerated, that is, sulfuric acid can be recovered. The invention uses an electrochemical method to remove hydrogen peroxide in sulfuric acid, and the lead dioxide anode is continuously regenerated without introducing other impurity elements and does not need to add alkaline reagents.

Description

technical field [0001] The invention belongs to the field of environmental protection, and more specifically relates to a method for recovering sulfuric acid from waste sulfuric acid containing hydrogen peroxide. Background technique [0002] The waste sulfuric acid solution containing hydrogen peroxide is waste water produced by the electronic processing industry, and such waste sulfuric acid solution containing hydrogen peroxide will be produced during the cleaning process of printed circuit boards. The output of printed circuit boards is increasing day by day, and there are more and more waste sulfuric acid solutions containing hydrogen peroxide. The concentration of hydrogen peroxide in the waste liquid far exceeds the concentration specified in the national sewage discharge standard. If it is discharged directly, it will cause huge pollution to the environment. Therefore, corresponding measures must be taken to deal with the waste liquid. [0003] In the prior art, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/22C25B11/04
CPCC25B1/22C25B11/051C25B11/077
Inventor 吴旭易娟王小赫贺明刘号石霖王秋玮吴小龙应俊张宇
Owner 湖北永绍科技股份有限公司
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