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Method and system for regeneration and recovery of glass thinning waste acid solution

A waste acid liquid thinning technology, applied in chemical instruments and methods, silicon oxide, fluosilicic acid, etc., can solve problems such as high processing costs, generation of potassium fluoride, insufficient recycling of waste discharge resources, etc., to achieve The effect of high recovery efficiency, realization of recycling and low treatment cost

Active Publication Date: 2022-04-22
浙江容跃环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0040] The invention proposes a method and system for regeneration and recovery of glass thinning waste acid solution, which solves the problem of insufficient recycling of waste discharge resources and generation of dangerous goods such as potassium fluoride in the existing glass thinning waste acid treatment process, which lead to subsequent Dealing with high cost issues

Method used

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  • Method and system for regeneration and recovery of glass thinning waste acid solution
  • Method and system for regeneration and recovery of glass thinning waste acid solution
  • Method and system for regeneration and recovery of glass thinning waste acid solution

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Embodiment 1

[0092] A method for regeneration and recovery of glass thinning waste acid solution, comprising:

[0093] Add 1000kg of waste acid liquid into the stirred reactor, and turn on the condenser (control the cooling temperature -5°C) (the condensation temperature can be selected from -15 to 19°C, and the better range is -10 to -5°C). Slowly and uniformly add 1850kg of 95% concentrated sulfuric acid into the stirred reactor, and stir while adding. It escapes in the form of gas; the output of hydrofluoric acid after passing through the condensation tower and refining tower is 113.8kg.

[0094] Uncondensed gas enters BF 3 Absorption Tower, BF 3 The gas is absorbed by ether into a liquid, and becomes a boron trifluoride-ether complex, which can be sold as a product. Moreover, the boron trifluoride-ether complex is analyzed and refined to obtain boron trifluoride gas; the auxiliary agent ether can be recycled. Boron trifluoride gas is absorbed by ice water into boron trifluoride dih...

Embodiment 2

[0100] A method for regeneration and recovery of glass thinning waste acid solution, comprising:

[0101] Add 1000kg of fluorine-containing waste acid to the stirred reactor, turn on the condenser (control the cooling temperature -5°C); slowly and uniformly add 1000kg of 95% concentrated sulfuric acid into the stirred reactor, stir while adding, the temperature of the reactor is displayed as 110 ℃, pressure 0.1-0.3MPa, reaction time 1 hour; hydrogen fluoride, silicon tetrafluoride, silicon tetrafluoride, and boron trifluoride escape in the form of gas; the output of hydrofluoric acid after passing through the condenser and refining tower is 108.2 kg.

[0102] Uncondensed gas enters BF 3 Absorption Tower, BF 3 The gas is absorbed by methanol into a liquid and becomes a boron trifluoride-methanol complex, which can be sold as a product. Among them, the boron trifluoride-methanol complex is analyzed and refined to obtain boron trifluoride gas; the auxiliary methanol can be rec...

Embodiment 3

[0108] A method for regeneration and recovery of glass thinning waste acid solution, comprising:

[0109] Add 1000kg of fluorine-containing waste acid to the stirred reactor, turn on the condenser (control the cooling temperature -5°C); slowly and uniformly add 4000kg of 95% concentrated sulfuric acid into the stirred reactor, stir while adding, the temperature of the reactor is displayed as 115 ℃, pressure 0.4-0.6MPa, reaction time 1 hour; hydrogen fluoride, silicon tetrafluoride, silicon tetrafluoride, and boron trifluoride escape in the form of gas; the output of hydrofluoric acid after passing through the condenser and refining tower is 82.3 kg.

[0110] Uncondensed gas enters BF 3 Absorption Tower, BF 3 The gas is absorbed by butyl acetate into a liquid and becomes boron trifluoride-butyl acetate complex, which can be sold as a product. Among them, the boron trifluoride-butyl acetate complex is analyzed and refined to obtain boron trifluoride gas; the additive butyl ac...

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Abstract

The present invention proposes a method and system for regeneration and recovery of glass-thinning waste acid solution. The method comprises: under the action of concentrated sulfuric acid, the glass-thinning waste acid solution is mixed with hydrogen chloride, silicon tetrafluoride, hydrogen fluoride, and boron trifluoride as gas The state escapes; condenses the hydrogen chloride, silicon tetrafluoride, hydrogen fluoride, and boron trifluoride gas to obtain hydrogen fluoride liquid; the uncondensed gas enters the BF 3 The absorption tower absorbs BF with additives 3 , to obtain boron trifluoride-auxiliary complex solution; the unabsorbed gas enters the HCl compressor, and the HCl gas is compressed into liquid HCl; the uncompressed gas enters the SiF 4 absorption tower. Using the method of the invention, the recovery rate of hydrofluoric acid (HF) contained in the glass thinning waste acid solution is ≥95%; the recovery rate of hydrochloric acid (HCl) is ≥93%. All the effective components in the waste acid are recycled, the treatment cost is low, and the recovery efficiency is high, which is suitable for industrial promotion and application.

Description

technical field [0001] The invention relates to the field of waste acid recovery, in particular to a method and system for regeneration and recovery of glass thinning waste acid liquid. Background technique [0002] TFT_LCD display is one of the widely used flat-panel displays at present. It has the characteristics of thin shape, light weight, low power consumption, and easy cutting. It is widely used in fixed equipment and mobile equipment. With the development of LCD and OLED technology, lightness and thinness are the two main core competitive elements in consumer IT products using this type of flat display technology. For this reason, manufacturers generally adopt the method of reducing the thickness of the glass substrate, so as to reduce the thickness and weight at the same time, and provide products for the market. [0003] In order to achieve the purpose of thinning the glass of the display panel, chemical etching is mainly used at present. [0004] Chemical etching...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/19C01B35/06C01B35/10C01B7/01C01B33/12C01B33/10C03C15/00
CPCC01B7/195C01B7/191C01B35/061C01B35/065C01B35/1054C01B7/0706C01B33/12C01B33/103C03C15/00
Inventor 应悦姜战应盛荣刘昌文闻涛
Owner 浙江容跃环保科技有限公司