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Method for recycling and utilizing phosphoric acid and acetic acid from waste aluminum etching solution

A technology of aluminum etching and phosphoric acid, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, phosphorus compounds, etc., can solve the problems of high energy consumption, no way to effectively recover acid, waste of phosphorus resources, etc., to achieve Improve economic benefits, avoid waste of resources and environmental pollution, and save raw materials

Inactive Publication Date: 2018-12-21
ANQING XINXIANGRUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment method for waste acid in aluminum etching waste liquid is mainly acid-base neutralization treatment, which consumes a lot of energy and wastes phosphorus resources
There are also many exploratory studies in this field, but most of them have no way to effectively recover acid and economically purify and separate acid liquid with a single component

Method used

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  • Method for recycling and utilizing phosphoric acid and acetic acid from waste aluminum etching solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get 1000g of photoelectric industry etching waste liquid, its chemical composition and content are as follows:

[0027] chemical composition

h 3 PO 4

CH 3 COOH

HNO 3

h 2 o

Al

Content (mass fraction)

62.6％

10.2％

4.3％

18.9％

very small amount

[0028] Follow the steps below to recover the mixed acid in the waste aluminum etching solution:

[0029] (1) Heat 1000g of waste aluminum etching solution to 55°C, add activated carbon at a stirring speed of 120rpm, activated carbon can reduce the color and turbidity in the waste liquid, keep stirring for 1.5h, filter while it is hot, and collect the waste aluminum after removing impurities etchant;

[0030] (2) Because the boiling point and volatility of phosphoric acid, nitric acid, and acetic acid differ greatly, utilize fractional distillation to separate nitric acid and acetic acid from the waste aluminum etching solution. Distill the waste liquid under reduced...

Embodiment 2

[0035] Get 1000g of photoelectric industry etching waste liquid, its chemical composition and content are as follows:

[0036] chemical composition

h 3 PO 4

CH 3 COOH

HNO 3

h 2 o

Al

Content (mass fraction)

67.6％

9.4％

4.8％

20.2％

very small amount

[0037] Follow the steps below to recover the mixed acid in the waste aluminum etching solution:

[0038] (1) Heat 1000g of waste aluminum etching solution to 55°C, add activated carbon at a stirring speed of 125rpm, keep stirring for 2 hours, filter while hot, and collect waste aluminum etching solution after removing impurities;

[0039] (2) Distill the waste liquid under reduced pressure at 0.095Mpa and 90°C to volatilize nitric acid and acetic acid in the waste liquid, and collect 398.4g of distillate;

[0040] (3) Ethanol is added to the residual waste liquid treated in step 2 to carry out acetic acid esterification reaction. After reacting for 2 hours under stirr...

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Abstract

The invention discloses a method for recycling and reutilizing phosphoric acid and acetic acid from a waste aluminum etching solution. The method comprises the following steps of (1) performing pressure-relief distillation on the waste aluminum etching solution, and removing acetic acid and nitric acid by a fractionation method; (2) treating by ethanol, purifying, and recycling the phosphoric acid; (3) adding sodium acetate into a nitric acid-acetic acid-water mixed solution to react, so as to obtain the acetic acid; applying a water absorbent, so as to obtain the high-concentration acetic acid. A harmless treatment and resource utilization method for recycling and reutilizing of the mixed acid is provided, and has the advantages that the resource recycling and reutilizing of the phosphoric acid and acetic acid can be furthest realized, the raw material is saved, the economic benefit is increased, the amount of wastewater is greatly reduced, and the waste of resource and the pollutionto environment are avoided; the technology process is simple, the operability is good, the effective resource utilization effect is realized, and the method is suitable for the industrial production and waste liquid treatment in the related fields.

Description

technical field [0001] The invention relates to the field of separation, recovery and application of mixed acid in etching solution, in particular to a method for recycling phosphoric acid and acetic acid from waste aluminum etching solution. Background technique [0002] At present, the display technology based on thin film transistor liquid crystal display (TFT-LCD) has been developed rapidly, and my country has become the largest production base of displays in the world. During the TFT-LCD manufacturing process, a large amount of acidic etching waste liquid will be discharged. If these waste liquids are not handled properly, they will cause pollution to the biochemical environment and have an important impact on human health. Therefore, we can make full use of some effective scientific methods to recycle resources, and direct discharge will not only waste resources but also pollute the environment. [0003] Aluminum etching solution is a strong acidic waste liquid produ...

Claims

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Application Information

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IPC IPC(8): C01B25/237C07C51/44C07C53/08
CPCC01B25/237C07C51/44C07C53/08
Inventor 李向峰李星星高豹黄安宁曹庆
Owner ANQING XINXIANGRUI CHEM CO LTD
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