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Method for recycling silicon carbide micropowder from waste mortar produced by cutting silicon wafer

A silicon carbide micropowder and silicon wafer cutting technology, which is applied in the direction of lubricating compositions, etc., can solve the problems of living environment pollution, achieve the effects of small environmental pollution, improve use efficiency, and reduce production costs

Inactive Publication Date: 2011-07-13
西安通鑫半导体辅料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although this recycling method can effectively obtain silicon carbide powder, it also produces a large amount of waste water, which will cause great pollution to the human living environment after direct discharge. From a long-term perspective, it is a way that is not worth the candle.

Method used

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  • Method for recycling silicon carbide micropowder from waste mortar produced by cutting silicon wafer
  • Method for recycling silicon carbide micropowder from waste mortar produced by cutting silicon wafer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] a Use a centrifugal separator to separate the waste mortar from solid to liquid, remove the liquid components, and obtain solid precipitates.

[0038] b Use a mixer to mix the solid precipitate obtained in a with water and dispersant stearic acid to obtain a suspension with a certain concentration.

[0039] c Using a downstream permanent magnet magnetic separator to repeatedly remove iron and continuously remove the ferroalloy in the suspension to obtain a suspension with less ferroalloy content.

[0040]d The suspension treated in step c is repeatedly mixed and settled by centrifugal sedimentation, the upper suspension is separated from the lower sediment by pouring, and the upper suspension is continuously removed to obtain a concentrated suspension with a higher silicon carbide content.

[0041] c. Use a vibrating fluidized bed dryer to dry the concentrated suspension obtained in step d, and then use a turbine classifier to achieve powder classification to further ob...

Embodiment 2

[0043] a Use a plate and frame filter to separate the waste mortar from solid to liquid, remove the liquid components, and obtain solid precipitates.

[0044] b Use a mixer to mix the solid precipitate obtained in a with water and the dispersant sodium dodecylsulfonate to obtain a suspension with a certain concentration.

[0045] c Use permanent magnetic iron remover to remove iron repeatedly, continuously remove the ferroalloy in the suspension, and obtain a suspension with less ferroalloy content.

[0046] d Use a settler to repeatedly mix and settle the suspension treated in step c, and then continuously collect the lower solid precipitate by means of valve discharge to obtain a solid precipitate with a higher silicon carbide content.

[0047] e Use a rotary drum dryer to dry the solid precipitate obtained in step d, and then use a cyclone separator to achieve powder classification, and further obtain silicon carbide micropowder with a higher concentration.

Embodiment 3

[0049] aUse a vacuum filter to separate the waste mortar from solid to liquid, remove the liquid components, and obtain solid precipitates.

[0050] b Use a mixing tank to mix the solid precipitate obtained in a with water and the dispersant sodium hexametaphosphate to obtain a suspension with a certain concentration.

[0051] c Using a semi-counter-current electromagnetic separator to repeatedly remove iron, continuously remove the ferroalloy in the suspension, and obtain a suspension with less ferroalloy content.

[0052] d Using an overflow tower to repeatedly mix and settle the suspension treated in step c, and then use continuous hydraulic countercurrent overflow washing to continuously remove the upper suspension to obtain a concentrated suspension with a higher silicon carbide content.

[0053] e Use a high-efficiency cyclone dryer to dry the concentrated suspension obtained in step d, and then use a turbo classifier to achieve powder classification, and further obtain ...

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Abstract

The invention relates to a method for recycling silicon carbide micropowder from waste mortar produced by cutting a silicon wafer. The method comprises the following steps of: firstly, performing solid-liquid separation on the waste mortar by use of a centrifuge, and mixing and stirring the separated solid sand and water; removing iron by magnetic separation, then adding a certain amount of dispersant, and performing ultrasonic treatment; realizing separation of silicon and silicon carbide particles as well as classification of the silicon carbide particles through precipitation or hydraulic overflow washing; and finally, drying the classified solids, and further separating the silicon powder and silicon carbide particles which are not completely separated by use of a cyclosizer so as to obtain high-purity silicon carbide powder. Through the invention, the silicon carbide micropowder in the waste mortar produced by cutting a silicon wafer rod can be effectively recycled, the recycling efficiency is high, the environmental pollution is little, the requirement for linear cutting of a silicon rod can be met, the recycling is realized, and the enterprise production cost is greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of waste mortar recovery, and relates to a method for recovering silicon carbide micropowder, in particular to a method for recovering silicon carbide micropowder from waste mortar produced by cutting silicon wafers. Background technique [0002] With the continuous development of the solar photovoltaic industry and the semiconductor industry, the use of monocrystalline and polycrystalline silicon continues to increase. Especially in recent years, the demand for large-area thin silicon wafers in the solar energy industry has continued to increase, and the quality requirements of silicon wafers have been continuously improved. Silicon carbide powder is widely used in multi-wire cutting of solar-grade large-diameter single crystal silicon rods due to its stable chemical properties, high hardness, and good wear resistance. [0003] In the industry, free silicon carbide abrasives are mainly used and polyethylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36C10M175/00
Inventor 卞维真宋涵孙守振吴静蕊
Owner 西安通鑫半导体辅料有限公司
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