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Process and system for resourcing and recycling fluorine-containing wastewater in photovoltaic industry

A technology for recycling waste water, applied in descaling and water softening, energy and waste water treatment, chemical instruments and methods, etc., can solve the problem of no fluorine recycling method, reduce the difficulty of treatment and operating costs, and reduce the pertinence of the process. Strong and economical effect

Active Publication Date: 2017-05-31
CHINA ELECTRONICS INNOVATION ENVIRONMENTAL TECH CO LTD +1
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Problems solved by technology

The calcium fluoride sludge in this method is discharged as sludge for disposal, and no corresponding fluorine resource utilization method has been proposed

Method used

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  • Process and system for resourcing and recycling fluorine-containing wastewater in photovoltaic industry
  • Process and system for resourcing and recycling fluorine-containing wastewater in photovoltaic industry
  • Process and system for resourcing and recycling fluorine-containing wastewater in photovoltaic industry

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specific Embodiment 1

[0049] Specific embodiment 1: The water quality and quantity of production wastewater in a certain photovoltaic industry are as shown in Table 1:

[0050] Table 1 Water quality and quantity of production wastewater in a photovoltaic industry

[0051]

[0052] The implementation steps of the present invention are:

[0053] (1) Separately collect concentrated acid wastewater, concentrated alkali wastewater, dilute acid wastewater, and dilute alkali wastewater;

[0054] (2) Recycling of concentrated acid wastewater: the concentrated acid wastewater enters the first regulating tank for homogenization; the concentration of fluoride ions and silicon ions in the concentrated acid wastewater is measured (the average concentration of fluoride ions is 66000 mg / L, and the concentration of silicon ions is 6000 mg / L L), pumped into the first crystallization reactor for reaction; NaCl was added in the first crystallization reactor, the addition amount was 25g / L, and the crystallization ...

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Abstract

The invention provides a process for resourcing and recycling fluorine-containing wastewater in the photovoltaic industry. The process comprises the following steps: sorting and collecting concentrated acid wastewater, concentrated alkali wastewater, diluted acid wastewater and diluted alkali wastewater; adding sodium salt or potassium salt into the concentrated acid wastewater according to the concentration of fluorosilicate ions of the concentrated acid wastewater to perform crystallizing reaction to obtain fluosilicate, and adding calcium salt into the concentrated acid wastewater according to the fluorinion concentration of the concentrated acid wastewater to perform crystallizing reaction to obtain calcium fluoride; removing fluorine from the diluted alkali wastewater and diluted acid wastewater, feeding into a precipitation tank for precipitating treatment, performing chemical softening treatment, sequentially passing through a sand filter, an activated carbon filter, a resin softener and a reverse osmosis device to obtain produced water; crystallizing the concentrated acid wastewater, feeding system effluent and concentrated alkali wastewater into a reaction tank for fluorine removal treatment, feeding into the precipitation tank for precipitating treatment, and producing condensed water through an evaporator. Furthermore, the invention provides a system for resourcing and recycling the fluorine-containing wastewater in the photovoltaic industry.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a process and system for resource utilization and reuse of fluorine-containing wastewater in the photovoltaic industry. Background technique [0002] A large amount of hydrofluoric acid is used in the production process of the photovoltaic industry (monocrystalline silicon solar cells and polycrystalline silicon solar cells), resulting in industrial wastewater with a high concentration of fluorine ions. Fluorine-containing wastewater is produced in the production processes of pickling, surface texturing, and phosphorus-silicate glass removal, and mainly includes concentrated acid wastewater (with a small amount of water) and dilute acid wastewater. Among them, the fluoride ion content of polycrystalline silicon concentrated acid wastewater is as high as 150000 mg / L, and that of single crystal silicon concentrated acid wastewater is as high as 10000 mg / L; t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01B33/10C01F11/22
CPCC01B33/103C01F11/22C02F9/00C02F1/583C02F1/52C02F1/441C02F5/00C02F1/001C02F1/42C02F1/283C02F1/04C02F2001/5218C02F2001/007Y02W10/37
Inventor 熊江磊罗峥禹路吴建华陈义吕柏林袁博庞毓旻宗盼盼邱霞钟春琳
Owner CHINA ELECTRONICS INNOVATION ENVIRONMENTAL TECH CO LTD
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