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Method for recycling silicon cutting waste mortar

A waste mortar and silicon cutting technology, applied in the direction of chemical instruments and methods, silicon carbide, silicon compounds, etc., to achieve the effect of improving appearance quality, improving conversion rate, and high dispersion

Active Publication Date: 2013-12-18
山东网金资源再利用发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no existing literature disclosing the method of simultaneously recovering polyethylene glycol, recovering silicon carbide, and simultaneously preparing silica sol from recycling cutting waste mortar

Method used

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  • Method for recycling silicon cutting waste mortar
  • Method for recycling silicon cutting waste mortar
  • Method for recycling silicon cutting waste mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Step (1): Weigh 2000g of silicon cutting waste mortar, stir evenly, add to a cyclone separator, and separate to obtain 1350g of solid flow and 650g of liquid flow;

[0053] Step (2): wash the separated solid flow with 1000g of water, vacuum filter, dry the obtained solid phase filter cake at a temperature of 110°C and weigh 1200g (silicon carbide content 94%; silicon component ( Si+SiO2) content 5.3%, wherein silicon content 5%, silicon dioxide content 0.3%);

[0054] Step (3): Dissolving 1200 g of the filter cake in 2400 g of deionized water, stirring evenly and fully to obtain a mixed suspension, stirring and activating the reaction at a temperature of 30°C for 40 minutes to remove the inert film on the surface of the silicon powder;

[0055] Step (4): After the activation reaction, add water glass at a temperature of 30°C (water glass is a solution of sodium silicate, the experiment specifically uses sodium silicate nonahydrate, and the density is 0.85g / cm 3 , the s...

Embodiment 2

[0067] Step (1): Weigh 2000g of silicon cutting waste mortar, stir evenly, add into a cyclone separator, and separate to obtain 1355g of solid flow and 645g of liquid flow;

[0068] Step (2): wash the separated solid flow with 2000g of water, vacuum filter, dry the obtained solid-phase filter cake at a temperature of 110°C and weigh 1200g (silicon carbide content 93.9%; silicon component ( Si+SiO 2 ) content of 5.2%, of which silicon content is 4.9%, silicon dioxide content is 0.3%);

[0069] Step (3): Dissolving 1200 g of the filter cake in 600 g of deionized water, stirring evenly and thoroughly to obtain a mixed suspension, stirring and activating the reaction at 30° C. for 30 minutes to remove the inert film on the surface of the silicon powder;

[0070] Step (4): After the activation reaction, add water glass at a temperature of 30°C, the quality of the water glass is 48g, i.e. 4% of the filter cake quality, stir evenly and let stand for 20 minutes;

[0071] Step (5): T...

Embodiment 3

[0082] Step (1): Weigh 4000g of silicon cutting waste mortar, stir evenly, add to a cyclone separator, and separate to obtain 2700g of solid flow and 1300g of liquid flow;

[0083] Step (2): wash the separated solid flow with 4000g of water, vacuum filter, and dry the obtained solid phase filter cake at a temperature of 110°C to obtain a mass of 2400g (silicon carbide content 94.3%; silicon component ( Si+SiO 2 ) content of 5.3%, including 5% silicon content and 0.3% silicon dioxide content);

[0084] Step (3): Dissolving 2400 g of the filter cake in 1200 g of deionized water, stirring evenly and thoroughly to obtain a mixed suspension, stirring and activating at a temperature of 50°C for 35 minutes to remove the inert film on the surface of the silicon powder;

[0085] Step (4): After the activation reaction, add water glass at a temperature of 50°C, the quality of the water glass is 48g, i.e. 2% of the filter cake quality, stir evenly and let stand for 60 minutes;

[0086]...

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Abstract

Disclosed is a method for recycling silicon cutting waste mortar. The method comprises the steps of performing solid-liquid separation of the waste mortar; performing solid flow washing and vacuum filtration; drying the obtained filter cake, mixing with deionized water and performing activation reaction; adding water glass and sodium hydroxide successively and performing heating reaction, performing solid-liquid separation of the obtained product, performing ion exchange resin decolorization and distillation of the liquid phase to obtain silica sol, and performing solid phase washing and drying to obtain a silicon carbide raw material; and performing ultra precision filter of obtained liquid phase after solid-liquid separation of the waste mortar, adding a decoloring agent a filter aid to perform solid-liquid separation, reducing the conductivity, and heating and evaporating water to obtain finished polyethylene glycol cutting liquid. According to the technical scheme of the method, the flow line production is achieved, the silicon cutting waste mortar is recycled, the silica sol is prepared effectively, and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to a method for recycling silicon cutting waste mortar to prepare silica sol. Background technique [0002] Silicon carbide with high hardness, small particle size and concentrated particle size distribution is used as the main cutting medium in the cutting process of solar silicon wafers. In order to disperse the silicon carbide micropowder evenly during the cutting process and take away the frictional heat generated during the cutting process in time, it is usually necessary to mix and stir silicon carbide and polyethylene glycol (PEG) in proportion to form a uniform and stable cutting mortar. For silicon wafer cutting. [0003] During the silicon cutting process, when silicon carbide particles in the mortar are ground with silicon rods, steel wires, etc., granular silicon carbide, granular silicon powder and metal particles are produced, that is, the specific components of the solid phase of the used cutting mortar undergo a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M175/00C01B33/141C01B31/36C01B32/956
Inventor 王庆顾秋菊
Owner 山东网金资源再利用发展有限公司
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