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Method for recovering phosphoric acid by electrolyzing mixed acid solution

A technology of mixing acid solution and phosphoric acid, which is applied in the direction of electrolysis components, electrolysis process, chemical instruments and methods, etc., can solve the problems of high energy consumption and difficult control of the process, and achieve simple process flow, simple steps and good treatment effect Effect

Active Publication Date: 2020-04-17
湖北永绍科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention solves the problems of high energy consumption and difficult control of the process in the prior art for the treatment of the mixed waste acid etching solution, and provides a method for recovering phosphoric acid by electrolyzing the mixed acid solution

Method used

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  • Method for recovering phosphoric acid by electrolyzing mixed acid solution

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Embodiment 1

[0029] A method for reclaiming phosphoric acid from an electrolytic mixed acid solution, characterized in that it comprises the following steps:

[0030] Step A: collecting mixed waste acid, which contains phosphoric acid, nitric acid and acetic acid, the mass concentration of phosphoric acid is 40%, the mass concentration of acetic acid is 15%, and the mass concentration of nitric acid is 2%. Stored in product tanks, agitated;

[0031] Step B: The mixed acid stored in the product tank in step A enters the electrolytic tank for circulating electrolysis, and the waste liquid is circulated between the electrolytic tank and the product tank at a speed of 130L / h, and the impurities per ton of water are electrolyzed The time is 24 hours; nitric acid is reduced at the cathode of the electrolytic cell, acetic acid is oxidized at the anode of the electrolytic cell, and different electrolytic reactions occur on the surface of the cathode and anode respectively. Mainly carry out the ox...

Embodiment 2

[0037] A method for reclaiming phosphoric acid from an electrolytic mixed acid solution, characterized in that it comprises the following steps:

[0038]Step A: collecting mixed waste acid, which contains phosphoric acid, nitric acid and acetic acid, the mass concentration of phosphoric acid is 60%, the mass concentration of acetic acid is 25%, and the mass concentration of nitric acid is 1%. Stored in product tanks, agitated;

[0039] Step B: The mixed acid stored in the product tank in step A enters the electrolytic tank for circulating electrolysis, and the waste liquid is circulated between the electrolytic tank and the product tank at a speed of 120L / h, and the impurities are removed by electrolysis per ton of water. The time is 24 hours; nitric acid is reduced at the cathode of the electrolytic cell, acetic acid is oxidized at the anode of the electrolytic cell, and different electrolytic reactions occur on the surface of the cathode and anode respectively. Mainly carry...

Embodiment 3

[0046] A method for reclaiming phosphoric acid from an electrolytic mixed acid solution, characterized in that it comprises the following steps:

[0047] Step A: collecting mixed waste acid, which contains phosphoric acid, nitric acid and acetic acid, the mass concentration of phosphoric acid is 70%, the mass concentration of acetic acid is 35%, and the mass concentration of nitric acid is 2%. Stored in product tanks, agitated;

[0048] Step B: The mixed acid stored in the product tank in step A enters the electrolytic tank for circulating electrolysis, and the waste liquid is circulated between the electrolytic tank and the product tank at a speed of 110L / h, and the impurities per ton of water are electrolyzed The time is 24 hours; nitric acid is reduced at the cathode of the electrolytic cell, acetic acid is oxidized at the anode of the electrolytic cell, and different electrolytic reactions occur on the surface of the cathode and anode respectively. Mainly carry out the ox...

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Abstract

The invention relates to a method for recovering phosphoric acid by electrolyzing a mixed acid solution, belonging to the field of resource recovery. The method comprises the following steps: puttingthe mixed acid solution into a product tank, wherein the mixed acid solution comprises phosphoric acid, oxyacid and organic acid; and inputting the mixed acid solution in the product tank into an electrolytic cell for cyclic electrolysis, reducing the oxyacid at the cathode of the electrolytic cell, oxidizing the organic acid at the anode of the electrolytic cell, and collecting gas generated in the cyclic electrolysis process through a gas collecting device so as to recover phosphoric acid in the mixed acid solution. The oxyacid is preferably nitric acid, nitrous acid, perchloric acid or hypochlorous acid, and the organic acid is preferably acetic acid, oxalic acid or propionic acid. According to the invention, phosphoric acid recovered through electrolysis can reach 99% or above, the technological process of treatment is simple, environmental pollution caused by direct discharge of waste acid liquid can be avoided, the additional value of products is high, and good economic benefitsand environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the field of resource recovery, in particular to a method for recovering phosphoric acid by electrolyzing a mixed acid solution. Background technique [0002] In recent years, thin film transistor liquid crystal display (TFT-LCD) has been widely used in fields such as electronic products, and has become the mainstream technology of flat panel display. Mixed waste acid etching solution is a kind of waste liquid produced by the wet etching process of the film in the production process of TFT-LCD. This kind of mixed waste acid is a strong acid and corrosive dangerous waste liquid. Contacting with the surface of the human body can cause burns and produce strong irritation. sex. If it is directly discharged into the environment, the rich N and P in the waste liquid will cause eutrophication of the water body and cause serious harm to the organisms in the water body. The future output of this kind of mixed waste acid in my country ...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B1/02C25B15/08C25B11/08C25B11/12C25B11/10C01B25/234
CPCC01B25/234C25B1/00C25B1/02C25B15/08C25B11/051C25B11/057C25B11/081
Inventor 吴旭贺明王小赫易娟石霖刘号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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