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Method for treating fluoride containing waste water in silicon wafer production process

A treatment method and technology of production process, which is applied in the field of treatment of fluorine-containing wastewater in the production process of silicon wafers, can solve the problems of unsatisfactory use effect and market prospect, low treatment efficiency, etc., achieve high use value, and the operation process is simple and easy , The effect of simple process operation

Inactive Publication Date: 2016-06-15
林淑录
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment efficiency of this treatment method is not high, and the use effect and market prospect are not ideal.

Method used

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  • Method for treating fluoride containing waste water in silicon wafer production process
  • Method for treating fluoride containing waste water in silicon wafer production process

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Experimental program
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Effect test

Embodiment 1

[0030] A method for treating fluorine-containing wastewater in the production process of silicon wafers, adopting lime neutralization-flocculation sedimentation-reverse osmosis concentration to treat fluoride-containing wastewater; the weight ratio of calcium oxide added in lime neutralization to wastewater is 1: 180, aluminum chloride sedimentation is used for flocculation and sedimentation, and aromatic polyamide roll-type reverse osmosis membrane is used for reverse osmosis concentration; the specific steps of the treatment method are:

[0031] Step S01, sending the fluorine-containing waste water into the regulating tank, and after 5 hours of sedimentation, filter it with a grid to remove insoluble matter and obtain the primary filtrate;

[0032] Step S02, adding calcium oxide to the primary filtrate and stirring to dissolve, so that the pH value of the water in the adjustment tank is 9, and after 7 hours of precipitation, filter with a screen to remove insoluble matter to ...

Embodiment 2

[0036] A method for treating fluorine-containing wastewater in the production process of silicon wafers, adopting lime neutralization-flocculation sedimentation-reverse osmosis concentration to treat fluoride-containing wastewater; the weight ratio of calcium oxide added in lime neutralization to wastewater is 1: 150, polyaluminum chloride sedimentation is used for flocculation and sedimentation, and aromatic polyamide roll-type reverse osmosis membrane is used for reverse osmosis concentration; the specific steps of the treatment method are:

[0037] Step S01, sending the fluorine-containing waste water into the regulating tank, and filtering it with a grid after 4 hours of sedimentation to remove the insoluble matter to obtain the primary filtrate;

[0038] Step S02, adding calcium oxide to the primary filtrate and stirring to dissolve, so that the pH value of the water in the adjustment pool is 9, and after 6 hours of precipitation, filter with a screen to remove insoluble m...

Embodiment 3

[0042] A method for treating fluorine-containing wastewater in the production process of silicon wafers, adopting lime neutralization-flocculation sedimentation-reverse osmosis concentration to treat fluoride-containing wastewater; the weight ratio of calcium oxide added in lime neutralization to wastewater is 1: 200. Polyaluminum chloride and aluminum chloride mixed sedimentation is used for flocculation and settlement, and aromatic polyamide roll-type reverse osmosis membrane is used for reverse osmosis concentration; the specific steps of the treatment method are:

[0043] Step S01, sending the fluorine-containing waste water into the adjustment tank, and after 6 hours of sedimentation, filter it with a grid to remove insoluble matter and obtain the primary filtrate;

[0044] Step S02, adding calcium oxide to the primary filtrate, stirring and dissolving, so that the pH value of the water in the adjustment tank is 9, and filtering with a screen after 8 hours of precipitation...

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Abstract

The invention discloses a method for treating fluoride containing waste water in the silicon wafer production process. The method is characterized by comprising the steps that the modes of lime neutralizing, flocculating settling and reverse osmosis concentration are adopted for treating the fluoride containing waste water; the ratio of the adding amount of lime in lime neutralizing to the weight of the waste water is 1:(150-250), and the lime is calcium oxide or calcium hydroxide; a defluorination flocculating agent is adopted for sedimentation in the flocculating settling process, an aramide roll type reverse osmosis membrane is adopted in the reverse osmosis concentration process, and the waste water is treated at the pressure of 0.5 Mpa to 1 Mpa and the temperature of 40 DEG C to 50 DEG C. The method is good in F-waste water treatment effect, low in energy consumption, low in cost, simple in process operation, good in repeatability and evenness and easy to popularize.

Description

technical field [0001] The invention belongs to the field of sewage treatment engineering, and in particular relates to a treatment method for fluorine-containing waste water in the production process of silicon wafers. Background technique [0002] Although solar energy is a green energy, and the pollutants emitted by solar cell factories are much less polluting to the environment than the oil and coal industries. However, due to the current domestic solar energy industry's backward technology and imperfect policies, there are still serious pollutions in the battery production process in China. The control of wastewater pollution from battery production is an unavoidable practical problem. At present, the commonly used fluorine-containing wastewater treatment processes mainly include adsorption method and precipitation method. The adsorption method refers to the removal of fluoride through ion exchange or chemical reaction with the solid medium in the bed when the fluorin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/14
CPCY02W10/37C02F9/00C02F1/001C02F1/441C02F1/5245C02F1/66C02F2001/007C02F2101/14C02F2209/08C02F2301/08
Inventor 林淑录
Owner 林淑录
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