Silicon wafer-cutting waste slurry recovery method

A recycling method and a technology for cutting silicon wafers, which are applied in the directions of silicon carbide, carbide, lubricating compositions, etc., can solve the problems of large amount of waste water, consumption of fluoride ions, high pollution, etc. The effect of the environment

Active Publication Date: 2012-08-22
泗阳瑞泰光伏材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although some manufacturers have started to recycle, but mostly adopt the method of acid-base washing, the amount of wastewater generated is very large, and about 100 tons of alkali washing wastewater and pickling wastewater can be produced per ton of s

Method used

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  • Silicon wafer-cutting waste slurry recovery method
  • Silicon wafer-cutting waste slurry recovery method

Examples

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Example Embodiment

[0020] Step 1. Pretreatment:

[0021] Use a pump to send the original mortar and water to the mortar mixing tank at a volume ratio of 2:3, perform effective and uniform stirring for 30 minutes, and then send the feed pump to the first-stage filter press for solid-liquid separation. The solids form a filter cake and stay On the filter plate, the liquid is sent to the solid-liquid separation tank.

[0022] Step 2: Recovery of polyethylene glycol:

[0023] The liquid in the solid-liquid separation tank is transported to the particle-removing filter press through a pump, and the filter press is cycled for 10-15 minutes. During the cycle, samples are taken from the tap of the filter press to observe the particles in the filtrate. If no small particles are visible, stop the cycle. If the filtrate is still turbid after circulating for 15 minutes, stop the circulation, loosen the filter plate to clean the filter cloth and continue to filter until the filtrate is qualified, and the qualifie...

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Abstract

The invention discloses a silicon wafer-cutting waste slurry recovery method, which adopts a physical treatment process. The silicon wafer-cutting waste slurry recovery method includes the following steps of: (step 1) pretreatment: solid-liquid separation is carried out; (step 2) recovery of polyethylene glycol on a liquid line: the filtrate obtained by separation in the first step undergoes particle-removing pressing, decoloration, ion exchange, four-effect distillation and cooling, so that the finished polyethylene glycol product is obtained; and (step 3) recovery of silicon carbide on a solid line: the filter cake obtained in the first step undergoes primary filter pressing, secondary filter pressing, drying and impurity separation by a separator, so that the finished silicon carbide product is obtained. The silicon wafer-cutting waste slurry recovery method not only has the advantages of large separation capacity, high recovery rate and good quality of recovered polyethylene glycol and silicon carbide, but also realizes environment-friendliness and zero-pollution treatment, and also reduces the production cost.

Description

technical field [0001] The invention relates to a method for recovering waste mortar from silicon chip cutting, which is mainly used for processing the waste mortar produced after silicon chip cutting, and recovering polyethylene glycol and silicon carbide therein. Background technique [0002] The process of human modernization continues to accelerate, and non-renewable resources such as coal and oil are also becoming increasingly exhausted. As a new energy source, solar energy has been strongly supported by governments of various countries. The solar photovoltaic industry has developed rapidly, and its related industries have also risen rapidly. The used silicon carbide waste mortar can be recycled and reused, which can save costs and protect the environment. At present, although some manufacturers have started to recycle and treat, but mostly adopt the method of acid-base washing, the amount of waste water generated is very large, and about 100 tons of alkali washing wast...

Claims

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Application Information

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IPC IPC(8): C10M175/00C08G65/34C01B31/36C01B32/956
Inventor 罗英明
Owner 泗阳瑞泰光伏材料有限公司
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