Hydrofluoric acid wastewater treatment method

A technology for wastewater treatment and hydrofluoric acid, which is applied in water/sewage treatment, water treatment parameter control, water/sewage multi-stage treatment, etc. It can solve the problems of reducing fluoride ion concentration, undisclosed, etc., and achieve cost reduction and environmental protection effects. The effect of reducing the harmfulness of the environment

Inactive Publication Date: 2013-06-19
NOVA TECH INC
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  • Claims
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Problems solved by technology

[0003] However, there has not been disclosed a technology capable of drastically reducing the concentration of fluoride ions using a ph...

Method used

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  • Hydrofluoric acid wastewater treatment method
  • Hydrofluoric acid wastewater treatment method
  • Hydrofluoric acid wastewater treatment method

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Embodiment Construction

[0017] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

[0018] figure 1 It is a flowchart showing the overall flow of the embodiment of the present invention.

[0019] The purpose of the present invention is to remove high-concentration fluorine ions remaining in etching wastewater generated after fine grinding process, pattern forming process and other processes for glass substrates. The main process is to use fluoride ion (F - ) precipitation reaction to form sludge, which was removed by filtration.

[0020] After the etching process, a large amount of hydrofluoric acid will remain in the solution, so the fluoride ion concentration will reach the level of 25,000ppm. In this wastewater, calcium-containing salts are first added together with a strong acid and stirred. During this process, calcium ions (Ca +2 ) combines with fluoride ions to form calcium fluoride (CaF 2 ) preci...

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Abstract

The invention relates to a hydrofluoric acid wastewater treatment method for treating wastewater after etching glass substrates. According to the invention, acid, calcium salt and calcium hydroxide are added to the wastewater in order to deposit fluoride ions and form calcium fluoride deposit. Coagulant aids containing salt and aluminum salt are added together with acid to form iron fluoride and aluminum fluoride deposit, and the result solution is naturalized. Polymer coagulant aids are added to form slug and the result solution is filtered to reduces the concentration of fluoride ion in the wastewater to a few hundredth. The method is environmental friendly and lowers wastewater treatment cost.

Description

technical field [0001] The present invention relates to a method for treating waste water of hydrofluoric acid which needs to be discarded after etching glass substrates, etc., and particularly relates to waste water treatment which reduces the concentration of fluorine from a high concentration to a low concentration after using an etching solution containing hydrofluoric acid and then discards it method. Background technique [0002] When manufacturing display panels and the like, a process of etching a glass substrate with an etching solution uses a large amount of a solution containing high-concentration hydrofluoric acid. Therefore, when the etching solution with a high concentration of hydrofluoric acid is still disposed of after the etching process, it is necessary to pay additional fees and entrust it to a service company specializing in the recovery of waste water, and the waste water containing hydrofluoric acid recovered in this way is not the same as other harmfu...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/5209C02F1/5245C02F1/56C02F1/583C02F2101/14C02F2209/06C02F2209/44
Inventor 黄龙云姜东昊李京植
Owner NOVA TECH INC
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