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Method for recycling silicon carbide in waste silicon slice cutting mortar

A silicon wafer cutting and silicon carbide technology, applied in the field of silicon carbide waste recycling process, can solve the problems of small secondary pollution, low recycling cost, high water consumption, etc., and achieve the effect of small secondary pollution and low recycling cost

Inactive Publication Date: 2013-10-30
SHUANGLIU XINYUAN SHENGGUANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high water consumption and secondary pollution in the existing waste mortar recycling process, and provide a method for recycling silicon carbide in waste mortar for silicon chip cutting, which can make polyethylene in waste The recovery rate of diol is 75%, the recovery rate of silicon carbide is 75%, and the recovery cost is low, and the secondary pollution is small

Method used

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  • Method for recycling silicon carbide in waste silicon slice cutting mortar

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Embodiment 1

[0039] The viscosity reducer uses water, and the volume ratio of solid particles is 2:1. It uses one ultrasonic cleaning and one cyclone separation. The content of silicon powder in the silicon carbide suspension obtained by cyclone separation is 3 / 1000, and then the magnetic tank Remove iron, then wash with alkali reaction for 4 hours, the mass fraction ratio of sodium hydroxide to solid particles is 1:10, the pH value of the alkali reaction tank is 10, enter the centrifuge to separate the alkaline liquid, and then add water to the centrifuge Centrifugal washing until the pH value is 6.5, stop adding water and continue to separate to obtain solid particles, then dry and classify, and finally obtain a recyclable silicon carbide product.

Embodiment 2

[0041] Viscosity reducers use ethanol and water respectively, the mass fraction ratio of ethanol to waste mortar is 1:1, add ethanol before secondary separation, the mass fraction ratio of ethanol to solid particles is 2:1, enter centrifugal separation, then add water and centrifuge Washing, when the pH value is 7, stop adding water and continue to separate to obtain a suspension and solid particles. The suspension is returned to the primary separation as a viscosity reducer. First-level ultrasonic cleaning and cyclone separation. After the first ultrasonic cleaning and cyclone separation, the obtained silicon carbide suspension liquid is subjected to centrifugation, and the obtained solid particles are added with water to make slurry, and then enter the second-level ultrasonic cleaning, cyclone separation, and centrifugation. Separation, drying and dry classification, and finally obtain recyclable silicon carbide particles.

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Abstract

The invention discloses a method for recycling silicon carbide in waste silicon slice cutting mortar. The method comprises the following steps of: adding a viscosity reducer into the waste silicon slice cutting mortar, and performing solid and liquid separation to obtain first-grade suspension and first-grade solid particles; adding the viscosity reducer into the first-grade solid particles, performing second-grade solid and liquid separation to further remove cutting liquid components from the solid particles, and thus obtaining second-grade solid particles; adding water into the second-grade solid particles, sequentially performing ultrasonic washing and vortex separation, and thus obtaining silicon powder suspension and silicon carbide suspension after performing vortex separation; and sequentially performing centrifugal separation, alkali reaction washing, centrifugal separation, centrifugal washing, drying and dry-method grading on the silicon carbide suspension, and thus finally obtaining a recyclable silicon carbide product. The silicon powder suspension obtained by vortex separation is filtered by a platy frame to obtain silicon powder solid particles and water, and the water is returned to the second-grade solid particles and used; and the suspension obtained by second-grade solid and liquid separation is returned to the first-grade solid and liquid separation and used as the viscosity reducer.

Description

technical field [0001] The invention relates to a process for recycling silicon carbide waste, in particular to a method for recycling silicon carbide in silicon chip cutting waste mortar. Background technique [0002] Silicon wafer processing plant is a key link in the information industry and solar photovoltaic industry. Both monocrystalline silicon and polycrystalline silicon ingots must be processed into silicon wafers before they can be used to make electronic devices and solar cells. With the rapid development of the solar photovoltaic industry, the silicon wafer processing industry has developed rapidly. According to statistics, the actual output of solar cells in my country reached 19GW in 2010, and the amount of waste mortar produced every day is as high as 2,700 tons. At present, the country has a hazardous waste business license There are less than 4 enterprises with a daily processing capacity of less than 700 tons. The waste mortar produced by silicon wafer proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/06C01B32/956
CPCY02W30/62
Inventor 孟庆华鄢洪建
Owner SHUANGLIU XINYUAN SHENGGUANG TECH