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Recovery processing method and processing system for boric acid formed in waste liquor

A technology for recovery and treatment of waste liquid, applied in chemical instruments and methods, multi-stage water/sewage treatment, heating water/sewage treatment, etc., can solve problems such as high heating cost, uneconomical, and environmental damage of filtrate, and achieve production Efficiency improvement, recycling cost reduction, effect of ensuring purity

Inactive Publication Date: 2009-11-18
RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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  • Summary
  • 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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  • Recovery processing method and processing system for boric acid formed in waste liquor

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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 method and system for recovering and treating boric acid in chemical waste liquid. The method includes the following steps: adding ammonia water to the waste liquid to promote the precipitation of aluminum hydroxide in the waste liquid, and separating the aluminum hydroxide precipitate from the waste liquid Obtain the primary liquid; add hydrochloric acid or nitric acid to the primary liquid to promote the hydrolysis of the ammonium pentaborate in the primary liquid to boric acid to obtain the acidified liquid; carry out vacuum distillation on the acidified liquid to distill the ammonium root, acid liquid and water , until the solid boric acid is precipitated; the precipitated solid boric acid is vacuum-dried or dried under normal pressure, and recovered for reuse. The treatment method and system of the present invention can efficiently separate aluminum and ammonium radicals from aging waste liquid, and convert ammonium pentaborate into boric acid for efficient recycling, which can better protect the environment and ensure the purity of recovered boric acid products And its recycling in the formed foil industry, and can improve production efficiency and reduce recycling costs.

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