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Method for manufacturing silicon and carbon composite balls through waste mortar generated during silicon slice cutting and application of silicon and carbon composite ball

A silicon wafer cutting and waste mortar technology, which is applied in the manufacture of composite silicon carbon balls from silicon wafer cutting waste mortar and its application field, can solve the problems of unsatisfactory recycling and utilization of high-purity silicon from waste mortar, unseen industrial utilization, and losses. Achieve the effects of simple manufacturing process, great economic and social benefits, and reduced steelmaking costs

Inactive Publication Date: 2016-03-09
ZHENGZHOU XINDA METALLURGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to theoretical calculations, 44% of the polysilicon will be cut into high-purity silicon powder and enter the cutting fluid during cutting, but in actual processing, 50-52% of the polysilicon will be lost in the form of silicon powder. big waste
[0003] Judging from the current situation of researchers' recycling of waste mortar for cutting silicon wafers, most of them are recycling polyethylene glycol and silicon carbide in waste mortar. The effect is relatively ideal and industrialized treatment has been realized. The recycling of high-purity silicon is not ideal
In order to improve the recycling of high-purity silicon in waste mortar, researchers from relevant scientific research institutes and enterprises have also invested a lot of financial and material resources in exploration and research one after another. Although some results have been achieved, so far no industrialization has been seen. Use of reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Recycle the waste mortar produced during silicon wafer cutting, extract the polyethylene glycol contained in it (the extracted polyethylene glycol can be reused), and make the remaining slurry into a filter cake, and dry it until the water content is less than 10%. Crushed into pellets with a particle size of less than 3mm, chemical analysis determines that the total silicon content in the pellets is T Si =61%, the total carbon content is Tc=20%; the binder carboxymethyl cellulose is weighed according to 4% of the total amount of the pellets, and sent into the wheel mill mixer together with the above pellets to fully mix, and an appropriate amount of water is added Mix it into a molding material, use a double-roller briquetting machine to make a pellet with a particle size of less than 50mm, put it into a drying furnace, and heat it up to 120~150°C for baking. When the moisture content of the pellet is less than 2%, it is cooled and released from the furnace. 40~60℃, ge...

Embodiment 2

[0028] Adopt the substantially same technique as embodiment 1, chemical analysis determines that the total silicon content that is broken into the granular material that particle size is less than 3mm is T Si =56%, the total carbon content is Tc=18%, the binder adopts organic binder dextrin, and the addition amount is 4% of the total pellets, and Tc=18% is obtained. Si =53%, Tc=17%, S≤0.1%, H 2 O≤2%, and the balance contains silicon dioxide and other impurities in the finished product of composite silicon carbon spheres.

[0029] The composite silicon carbon balls are used together as deoxidation alloying and recarburizing agent in the converter smelting of HRB400 steel in a steel factory. The cost per ton of steel is 14.85 yuan, which is similar to the cost of 16.70 yuan per ton of steel using ferrosilicon + carburizing agent in the original process. Compared with that, the cost of steelmaking is reduced by 1.85 yuan per ton.

[0030] When the composite silicon carbon balls...

Embodiment 3

[0032] Adopt the substantially same technique as embodiment 1, chemical analysis determines that the total silicon content that is broken into the granular material that particle size is less than 3mm is T Si =42%, the total carbon content is Tc=14%, and the binder is Portland cement, which is an inorganic binder. Si =38%, Tc=12%, S≤0.1%, H 2 O≤2%, and the balance contains silicon dioxide and other impurities in the finished product of composite silicon carbon spheres.

[0033] The composite silicon carbon ball is used as a 120t converter in a steel plant when the silicon content of the molten iron is less than 0.8% or the temperature of the molten steel is low. Adding 500kg of the composite silicon carbon ball can increase the temperature by 35~40°C. Adding 500kg of composite silicon carbon balls can add 4~4.5 tons of scrap steel, which reduces the amount of molten iron and ferroalloy used for heating, and reduces the cost of steelmaking.

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Abstract

The invention discloses a method for manufacturing silicon and carbon composite balls through waste mortar generated during silicon slice cutting. According to the method, firstly, the waste mortar generated in the silicon slice cutting process is recycled, polyethylene glycol is extracted for use, the residual mortar containing silicon carbide and silica powder is made into filter cakes to be air-dried till the water content is smaller than 10%, then the filter cakes are broken into granules with the grain size smaller than 3 mm, and the total content of silicon is confirmed through chemical analysis and then the granules are classified and stored for use; a bonding agent and a wetting agent are weighed and mixed with the granules to be made into blanks with the grain size smaller than 50 mm, the blanks are put into a furnace to be baked till the water content of the blanks is smaller than 2%, then the blanks are cooled and taken out from the furnace, and the silicon and carbon composite balls are obtained, wherein the physicochemical indexes stratify the conditions of TSi=30%-70%, Tc=10%-25%, S<=0.1% and H2O <=2%. The manufacturing process is simple, recourses contained in by-product-waste mortar generated in the silicon slice cutting and machining processes are used comprehensively, environmental pollution is reduced greatly, and great economic benefits and social benefits are generated.

Description

technical field [0001] The present invention relates to the recycling technology of waste mortar, a by-product produced in the process of cutting silicon wafers in the solar energy and electronics industries, and in particular to a method for manufacturing composite silicon carbon balls from silicon wafer cutting waste mortar. The invention also relates to the composite The application of silicon carbide spheres as a composite deoxidizer in steelmaking. Background technique [0002] In the solar energy and electronics industries, a large amount of waste mortar containing polyethylene glycol, silicon carbide and polysilicon powder will be discharged when the industry cuts silicon rods. Among the waste mortar, polysilicon has the greatest value. According to theoretical calculations, 44% of the polysilicon will be cut into high-purity silicon powder and enter the cutting fluid during cutting, but in actual processing, 50-52% of the polysilicon will be lost in the form of silic...

Claims

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Application Information

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IPC IPC(8): C21C7/06
CPCC21C7/06C21C7/0037
Inventor 池震宇
Owner ZHENGZHOU XINDA METALLURGICAL TECH CO LTD
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