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Boric acid formed in waste liquor recovery processing method and processing system thereof

A technology for recovery and treatment of waste liquid, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, heating water/sewage treatment, etc. It can solve problems such as high heating costs, filtrate damage to the environment, and economic uneconomical, and achieve recycling Cost reduction, production efficiency improvement, environmental protection effect

Inactive Publication Date: 2008-03-12
RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the traditional method are: 1. Aluminum and ammonium pentaborate in the waste liquid are not removed, not only the aluminum and ammonium pentaborate cannot be collected and recycled, but the filtrate will still damage the environment; 2, the ammonium pentaborate in the waste liquid is not separated , the recovered boric acid is not pure enough due to the residue of ammonium pentaborate, and the recovered boric acid cannot be recycled in the chemical foil industry, and the treatment is still a big problem; 3. The heating cost of the traditional treatment method is too high, and it is not economical

Method used

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  • Boric acid formed in waste liquor recovery processing method and processing system thereof

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Effect test

Embodiment 1

[0025] Get boric acid waste liquid 10L, know that it contains about 500 grams of boric acid according to the bath concentration. Add ammonia water to adjust the pH value to 6.0, and consume 50 mL of ammonia water. After stirring evenly, let it stand for 5 hours, a white flocculent precipitate precipitated at the bottom of the waste liquid, which was separated by suction filtration. Add 30 mL of concentrated nitric acid to the mother liquor, stir evenly, and the pH value is 3.5. It was distilled under reduced pressure at room temperature (25°C) at a pressure of 3kPa (22mmHg). The precipitated boric acid crystals were placed in a vacuum drying oven, and dried at 35° C. and 6 kPa (45 mmHg) for 2 hours. The weighed boric acid quality is 485 grams.

Embodiment 2

[0027] Get boric acid waste liquid 10L, know that it contains about 700 grams of boric acid according to the bath concentration. Add ammonia water to adjust the pH value to 6.0, and consume 52 mL of ammonia water. After stirring evenly, centrifuge for 5 minutes at a speed of 500 rpm. A white flocculent precipitate precipitated at the bottom of the waste liquid, which was separated by suction filtration. Add 38 mL of concentrated nitric acid to the mother liquor, stir evenly, and the pH value is 2.5. It was distilled under reduced pressure at room temperature (25°C) at a pressure of 3.5kPa (26mmHg). The precipitated boric acid crystals were placed in a vacuum drying oven, and dried at 35° C. and 6.5 kPa (48 mmHg) for 2 hours. The weighed boric acid quality is 695 grams.

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Abstract

The invention relates to a recycling processing method and a processing system of forming boric acid in waste liquid. The method includes the following steps of that ammonia is added in the waste liquid to promote the waste liquid to precipitate aluminum hydroxide deposition, separate precipitate aluminum hydroxide deposition from the waste liquid and get primary separating liquid; acidizing fluid with low boiling point is added in the primary separating liquid to promote ammonium borate pentaborate in the primary separating liquid to hydrolyze into boric acid and acquire acidizing fluid; the acidizing fluid is decompressed and distilled to braize out the water in ammonium group and acidizing fluid until solid boric acid is precipitated; the solid boric acid precipitated is dried in vacuum or normal pressure and recycled. The processing method and system of the invention can high effectively precipitate aluminum and ammonium group and transfer the ammonium borate pentaborate into boric acid so as to high effectively recycle and utilize. The invention can not only better protect environment, but also guarantee the purity of recycling boric acid product and recycling application in the foil forming industry. The invention can improve production efficiency and reduce recycling cost as well.

Description

technical field [0001] The invention relates to a chemical production treatment technology, more specifically, the invention relates to a purification and environmental protection reuse technology and treatment system of industrial boric acid waste liquid. Background technique [0002] With the rapid development of the electronics industry, more and more capacitors are used. In the formation foil industry for the production of capacitor aluminum foil, a large amount of capacitor-grade boric acid is used as the formation bath solution for medium and high pressure formation, and ammonia water or ammonium pentaborate is usually added to adjust the pH value when preparing the bath solution. [0003] During the chemical formation process, a small amount of aluminum on the aluminum foil will continuously dissolve into the bath solution, which will eventually result in a decrease in the formation efficiency and product quality, that is, the aging of the bath solution. When the agi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/10C02F9/10C02F1/04
Inventor 李道重
Owner RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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