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
View PDF5 Cites 5 Cited by
  • 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 re

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] The waste mortar produced when the silicon wafer is cut is recovered, the polyethylene glycol contained in it is extracted (the extracted polyethylene glycol can be reused), the remaining slurry is made into a filter cake, and after drying until the moisture is less than 10%, It is broken into pellets with a particle size of less than 3mm, and chemical analysis determines that the total silicon content in the pellets is T Si = 61%, the total carbon content is Tc = 20%; Weigh the binder carboxymethyl cellulose according to 4% of the total amount of pellets, and send it into the wheel mill mixer together with the above pellets to fully mix, add an appropriate amount of water Mixed into molding material, the ball blank with a particle size of less than 50mm is made in a roller briquetting machine, put into a drying furnace, and heated to 120~150 ℃ for baking. When the moisture content of the ball blank is less than 2%, it is cooled and released from the...

Example Embodiment

[0027] Example 2

[0028] Using substantially the same process as in Example 1, chemical analysis determined that the total silicon content of the pellets crushed into particles with a particle size of less than 3 mm was 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 to obtain T Si =53%, Tc=17%, S≤0.1%, H 2 O ≤ 2%, the balance contains silicon dioxide and other impurities in the composite silicon carbon ball finished product.

[0029] The composite silicon carbon ball is used as deoxidizing alloying and carburizing agent in the converter smelting of HRB400 steel in a steel plant. In comparison, the steelmaking cost is reduced by 1.85 yuan per ton.

[0030] When the composite silicon carbon ball is used as the deoxidizing alloying of HRB400 steel in converter smelting in a steel plant, the cost per ton of steel is 13.95 yuan when used in conjunction with C50 and SiC20 pre-deoxid...

Example Embodiment

[0031] Example 3

[0032] Using substantially the same process as in Example 1, chemical analysis determined that the total silicon content of the pellets crushed into particles with a particle size of less than 3 mm was T Si = 42%, the total carbon content is Tc = 14%, and the binder adopts the inorganic binder Portland cement, and the addition amount is 8% of the total pellets. During baking, the temperature is raised to 200~300 ° C for drying to obtain T Si =38%, Tc=12%, S≤0.1%, H 2 O ≤ 2%, the balance contains silicon dioxide and other impurities in the composite silicon carbon ball finished product.

[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 molten steel temperature is low. Adding 500kg of composite silicon carbon ball can increase the temperature by 35~40℃. For every 500kg of composite silicon carbon balls, 4~4.5 tons of scrap steel can be added, which re...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C21C7/06
CPCC21C7/06C21C7/0037
Inventor 池震宇
Owner ZHENGZHOU XINDA METALLURGICAL TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap