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Wastewater recycling method and system

A waste water circulation and waste water technology, applied in the field of silicon wafer manufacturing, can solve the problems of large tap water consumption

Active Publication Date: 2013-04-24
YINGLI GRP
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a waste water recycling method and system to reduce the problem of consuming a large amount of tap water in the production of single polycrystalline silicon wafers in the prior art

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  • Wastewater recycling method and system
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Embodiment Construction

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0026] In the embodiment of the present invention, according to the water quality requirements of each water link in the single-polycrystalline silicon wafer manufacturing process, these water links are divided into high water quality water link, medium water quality water link, and low water quality water link; the high water quality water link is discharged Purify the waste water, and then use it as water for medium water quality and low water quality water links, so that the wastewater discharged from high water quality water links can be better used, and the impact on tap water from medium water quality water links and low water quality water links can be reduced. Usage amount. If the water consumption of medium water quality and low water quali...

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Abstract

The invention provides a wastewater recycling method and a wastewater recycling system, which aims to solve the problem that in the prior art the manufacturing of single and polycrystalline silicon sheets consumes a great amount of tape water. The method comprises the following steps: according to requirements on water quality of various water use procedures in the single and polycrystalline silicon sheet manufacturing process, classifying the water use procedures into a high-class water quality use procedure, a middle-class water quality use procedure and a low-class water quality use procedure; conducting purification treatment on the wastewater discharged in the high-class water quality use procedure; and using the purified wastewater in the middle-class water quality use procedure and the low-class water quality use procedure. According to the technical scheme, the wastewater in the polycrystalline silicon sheet manufacturing process is recycled and treated by using a primary sedimentation basin and a secondary sedimentation basin and is subsequently applied to the manufacturing process, and no extra tape water is used in the middle-class water quality use procedure and the low-class water quality use procedure, so that the tape water consumption in the single and polycrystalline silicon sheet manufacturing process is reduced.

Description

technical field [0001] The invention relates to the field of silicon chip manufacturing, in particular to a waste water recycling method and system. Background technique [0002] In the field of solar cell production, solar cells made of polycrystalline silicon wafers have always been the mainstream products in the photovoltaic market. In the entire crystalline silicon solar cell industry chain, the production of single and polycrystalline silicon wafers is a major water user. Under the background of the pollution reduction, how to significantly reduce the unit consumption of water resources on the premise of ensuring the normal operation of the production process and equipment is an urgent problem to be solved. [0003] At present, the production of single polycrystalline silicon blocks and silicon wafers in the industry is basically realized by multi-wire cutting, that is, high-speed steel wires carry mortar containing SiC particles to cut silicon ingots into silicon block...

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Application Information

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IPC IPC(8): B01D36/04
Inventor 田欢朱峰梁宏建崔嘉轩陈志军
Owner YINGLI GRP