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Method for treating and recycling glass thinning and etching waste liquor

A glass thinning and etching waste liquid technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as high pollution, high waste, high consumption, etc. Achieve the effects of avoiding environmental pollution, high removal efficiency, and improving quality

Inactive Publication Date: 2012-10-24
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, the existing glass thinning etching waste liquid treatment technology has the defects of high consumption, high pollution, and high waste

Method used

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  • Method for treating and recycling glass thinning and etching waste liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 20ml simulated glass thinning etching waste solution to 50ml centrifuge tubes 1, 2, 3, and 4 respectively, the composition of which is 10% H 2 SiF 6 , 10% HF, 5% HCl and 2% H 2 SO 4 Add NaCl saturated solution (solubility 36g) 4.5ml, 5.6ml, 6.7ml, 7.8ml in each tube, make NaCl and H 2 SiF 6 The molar stoichiometric ratio is 1.6, 2.0, 2.4, 2.8; shake the centrifuge tube so that NaCl and H 2 SiF 6 Fully contact with the reaction, then let stand for 30min, filter, measure H 2 SiF 6 The removal rates were 72.39%, 93%, 98.62%, and 99.33%, respectively.

[0035] In NaCl and H 2 SiF 6 Under the condition that the molar stoichiometric ratio is 2, the simulated glass thinning etching waste liquid after treatment passes through the anion diffusion dialyzer at a flow rate of 10ml / min, the flow rate of clear water is controlled at 11ml / min, and the recovery rate of the acid solution after treatment is 60-70%. , The removal rate of metal ions is 60-80%.

[0036] 100g ...

Embodiment 2

[0038] Add 20ml simulated glass thinning waste liquid to 50ml centrifuge tubes 1, 2, 3, and 4 respectively, the composition of which is 10% H 2 SiF 6 , 10% HF, 5% HCl and 2% H 2 SO 4 ; Add KCl saturated solution (solubility 34g) 5.3ml, 6.6ml, 7.9ml, 10.5.ml in each tube, so that KCl and H 2 SiF 6 The molar stoichiometric ratio is 1.4, 1.7, 2.1, 2.8; shake the centrifuge tube so that KCl and H 2 SiF 6 Fully contact with the reaction, then let it stand for 30min, filter, and calculate H 2 SiF 6 The removal rates were 66.20%, 83.76%, 98.08%, and 99.50%, respectively.

[0039] In NaCl and H 2 SiF 6 The simulated glass thinning etching waste liquid treated under the condition of molar stoichiometric ratio of 2 passes through the anion diffusion dialyzer at a flow rate of 10ml / min, the flow rate of clear water is controlled at 11ml / min, and the recovery rate of the acid solution after treatment is 60-70%. The removal rate of metal ions is 60-80%.

Embodiment 3

[0041] Prepare 4 kinds of glass thinning waste liquids, numbered A~D respectively, and the H in each simulated waste liquid 2 SiF 6 The content is 2.03%, 4.20%, 5.77%, 7.74%, and the other components are the same, respectively 10% HF, 5% HCl, 2% H 2 SO 4 and 5% NH 4 HF 2 , take 20ml of waste liquid from A~D respectively, and add them to 50ml centrifuge tubes 1, 2, 3, and 4 in turn; add 1.15ml, 2.42ml, 3.36ml, 4.39.ml of NaCl saturated solution (solubility 36g) to each tube , so that NaCl and H 2 SiF 6 The molar stoichiometric ratio is 2; shake the centrifuge tube so that NaCl and H 2 SiF 6 Fully contact with the reaction, then let it stand for 30min, filter, and measure the H in the solution 2 SiF 6 content, calculate H 2 SiF 6 The removal rates were 46.62%, 78.99%, 81.92% and 86.82%, respectively.

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Abstract

The invention relates to a method for treating and recycling glass thinning and etching waste liquor. The method comprises the steps of: (1) mixing glass thinning and etching waste liquor with alkali metal salt, so as to generate fluosilicate precipitate in fluorosilicic acid in the glass thinning waste liquor to be separated out; (2) settling and filtering the fluosilicate precipitate to carry out solid-liquid separation; (3) introducing a filtrate to a diffusion dialysis device, removing redundant alkali metal ion in the filtrate to acquire acid liquor; (4) supplementing components to the acid liquor, so as to achieve the glass thinning and etching usage requirements and recycle; (5) reacting the fluosilicate precipitate acquired by filtering in the step (2) with soda ash solution to generate metal fluoride and silica gel precipitate; (6) separating the generated metal fluoride and the silica gel precipitate, wherein the metal fluoride is used for treating fluosilicic acid, and the silica gel is to be sold. Compared with the prior art, the method has the advantages that etching waste liquor can be recycled, the exhaustion of waste liquor and waste residue can eb reduced, the environment pollution risks are reduced, and the production cost is saved.

Description

technical field [0001] The invention relates to a waste acid solution treatment and reuse technology in the glass thinning process of the electronics industry, in particular to a sodium / potassium salt precipitation method to remove fluosilicic acid in glass thinning and etching waste liquid and realize waste liquid recovery method of use. Background technique [0002] With the development of electronic display devices in the direction of thinning and lightening, the thickness of the display glass screen has been reduced from 1.1 mm in 1996 to 0.5 mm at present. The thickness of glass used in portable devices such as mobile phones has been reduced to less than 0.3 mm. Ultra-thin glass is difficult to manufacture and is easily broken in subsequent application processing steps. Therefore, glass thinning treatment, that is, etching thinning treatment using hydrofluoric acid and ammonium bifluoride as main components, is a commonly used method. [0003] Glass matrix thinning a...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01B33/148C01D3/02C02F1/44
Inventor 晏乃强徐雅玲黄源瞿赞李凯华尹云舰邢攸美刘志彪
Owner SHANGHAI JIAO TONG UNIV
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