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Method for online recovering and recycling of fluorine-containing glass thinning waste liquid in glass thinning industry

A technology for glass thinning and waste liquid recovery, applied in chemical instruments and methods, multi-stage water/sewage treatment, water pollutants, etc., can solve problems such as high acid component content, achieve fast sedimentation rate, and avoid waste of resources , the mild effect of the reaction process

Inactive Publication Date: 2019-04-16
HANGZHOU GREENDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method also has the following disadvantages: during the treatment process, with the addition of sodium, potassium or barium compounds, a large amount of anions are additionally brought into the treatment solution, resulting in the formation of other new acid components after the subsequent addition of hydrofluoric acid , and exists in the etching solution, it will have a great impact on the process, even if the same sodium, potassium or barium salt as the anion of the same acid component in the etching solution is used, there will still be a problem of high content of the acid component

Method used

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  • Method for online recovering and recycling of fluorine-containing glass thinning waste liquid in glass thinning industry
  • Method for online recovering and recycling of fluorine-containing glass thinning waste liquid in glass thinning industry

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Configure simulated glass thinning waste liquid, its composition is 10% HF, 2% H by weight 2 SO 4, 5% HCl, 5% H 2 SiF 6 , 5%NH 4 HF 2 .

[0040] 1) Take 200g of the simulated glass thinning waste liquid in plastic beakers numbered 1, 2, 3, and 4 respectively, and add sodium oleate solid to the beaker so that the molar ratios of sodium oleate and fluorosilicic acid are 1.0, 2.0, 3.0, 4.0, 5.0, keep stirring for 2H, so that the solid and liquid can fully contact and react;

[0041] 2) Stop stirring and let it stand for 20 minutes, so that the precipitate in the mixed solution naturally settles at the bottom of the beaker, and the formed oleic acid and the treatment solution are completely separated;

[0042] 3) separating the precipitate at the bottom, washing and drying to obtain a solid sodium fluorosilicate;

[0043] 4) Transfer the upper layer of oleic acid to another plastic beaker, add 30% NaOH solution in a molar ratio of 1.0, fully stir and react, and dry f...

Embodiment 2

[0046] Configure 4 kinds of simulated glass thinning waste liquids, respectively numbered as A, B, C, D, E, and the composition of which is H 2 SiF 6 2%, 4%, 6%, 8%, 10% by weight, the remaining components are 10% HF, 2% H 2 SO 4 , 5% HCl, and 5% NH 4 HF 2 .

[0047] 1) Take 200g of the simulated glass thinning waste liquid respectively in plastic beakers numbered 1, 2, 3, 4, 5, and add potassium octanoate solid to the beaker, so that the molar ratio of potassium octanoate to fluorosilicic acid is 2.5, Stir continuously for 2H, so that the solid and liquid are fully contacted and reacted;

[0048] 2) Stop stirring and let it stand for 20 minutes, so that the precipitate in the mixed solution naturally settles at the bottom of the beaker, and the octanoic acid formed is completely separated from the treatment solution;

[0049] 3) The bottom precipitate is separated, washed and dried to obtain potassium fluorosilicate solid;

[0050] 4) Transfer the octanoic acid in the ...

Embodiment 3

[0053] The glass thinning waste liquid in the original manufacturing process of a certain unit, its composition is 6.17% HF, 2% H by weight 2 SO 4 , 5.08% HCl, 5.70% H 2 SiF 6 and 8.27% NH 4 HF 2 .

[0054] 1) Take 200g of the simulated glass thinning waste liquid respectively in plastic beakers numbered 1, 2, 3, and 4, and add sodium hexanoate solid into the beaker so that the molar ratio of sodium hexanoate to fluorosilicic acid is 1.6, 2.0, 2.4, 2.8, 3.2, keep stirring for 2H, so that the solid and liquid are fully contacted and reacted;

[0055] 2) Stop stirring and let it stand for 20 minutes, so that the precipitate in the mixed solution naturally settles at the bottom of the beaker, and the hexanoic acid formed is completely separated from the treatment solution;

[0056] 3) separating the precipitate at the bottom, washing and drying to obtain a solid sodium fluorosilicate;

[0057] 4) Transfer the hexanoic acid in the upper layer to another plastic beaker, add ...

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Abstract

The invention relates to a method for online recovering and recycling of fluorine-containing glass thinning waste liquid in the glass thinning industry. The method comprises the steps of (1) analyzingvarious acid component contents of the fluorine-containing glass thinning waste liquid; (2) under constant stirring, adding organic acid alkali metal salt to the fluorine-containing glass thinning waste liquid in a molar ratio to be mixed; (3) after sedimentation is settled, separating the sedimentation from the bottom, and after washing, dehydration and drying, obtaining a fluorosilicate alkalimetal salt solid; (4) separating an organic acid from an upper portion, after alkali metal hydroxide saponifying, and drying to obtain the organic acid alkali metal salt; (5) adding a hydrogen fluoride acid and other useful acid components to treated fluorine-containing liquid separated in the middle portion to meet the content of each component of an etching solution in an original glass thinningprocess, microfiltering, and returning to the original process for further use. The method does not bring an anion to recovering liquid after treatment, has mild reaction process, and is safe and reliable.

Description

technical field [0001] The invention relates to a method for online recycling and reuse of fluorine-containing glass thinning waste liquid in the glass thinning industry, and belongs to the technical field of recycling and reuse of glass thinning waste liquid in the glass thinning industry. Background technique [0002] With the rapid development of modern technology, electronic display equipment tends to become thinner and lighter. The thickness of the display glass screen has dropped from 1.1mm in 1996 to the current 0.5mm, especially for mobile phones, tablets and other portable electronic devices. The glass screen even drops below 0.3mm. In the manufacturing process of the display glass screen, the thinning treatment of the glass substrate is an important link to ensure the completion of the process, and the quality of the thinning effect will directly affect the quality of the product. [0003] At present, acid etching treatment is the most commonly used glass thinning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/14
CPCC02F1/00C02F1/5236C02F2101/14
Inventor 尹云舰刘志彪邢攸美
Owner HANGZHOU GREENDA CHEM
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