Method for recovering silicon carbide, high-purity silicon and dispersion liquid from silicon material linear cutting waste mortar

A technology of silicon carbide and wire cutting, applied in the field of high-purity silicon and dispersion liquid, and recovery of silicon carbide

Inactive Publication Date: 2012-02-15
刘荣隆
View PDF5 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] To sum up the various methods, it is known that silicon carbide, dispersion liquid and silicon with limited purity can only be recovered from waste...

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recovering silicon carbide, high-purity silicon and dispersion liquid from silicon material linear cutting waste mortar
  • Method for recovering silicon carbide, high-purity silicon and dispersion liquid from silicon material linear cutting waste mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Cooperate figure 1 As shown, the production process is as follows: take 500Kg of waste mortar, first centrifuge it with a centrifuge, and separate the solid and liquid to obtain 340Kg of solid filter residue 1 and 156Kg of crude PEG, add 150Kg of deionized water to the filter residue 1, and stir well After centrifugal filtration, 162Kg of secondary filtrate and 326Kg of secondary filter residue were obtained.

[0065] The secondary filtrate was distilled under reduced pressure at a vacuum of 80 Torr and a temperature of 80°C to finally obtain 45Kg of a liquid with a water content of 6.6% wt. The 156Kg crude PEG of the primary filtrate was combined to a total of 201Kg, and the secondary distillation was carried out at a vacuum of 50 Torr and a temperature of 70°C , obtain PEG185Kg with water content<0.5%wt, add polyacrylic acid sulfonate, aerosol silicon dioxide additive and obtain viscosity 65mPaS, pH value 5.8, the recovery dispersion liquid 188Kg of water content 0.25...

Embodiment 2

[0071] Cooperate figure 1 As shown, the production process is as follows: take 500Kg of waste mortar, first centrifuge it with a centrifuge, and separate the solid and liquid to obtain 340Kg of solid filter residue 1 and 156Kg of crude PEG, add 150Kg of deionized water to the filter residue 1, and stir well After centrifugal filtration, 162Kg of secondary filtrate and 326Kg of secondary filter residue were obtained.

[0072] The secondary filtrate was distilled under reduced pressure at a vacuum degree of 80 Torr and a temperature of 80°C to obtain 46Kg of a liquid with a water content of 7%wt. The 156Kg crude PEG of the primary filtrate was combined to a total of 202Kg, and the secondary distillation was carried out at a vacuum degree of 50 Torr and a temperature of 70°C 184Kg of PEG with a water content of <0.5%wt was obtained, and after adding organic phosphonate, alkyl sulfonate polyacrylic acid sulfonate, and hydroxycellulose additives, 189Kg of a recovered dispersion wit...

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

PropertyMeasurementUnit
Viscosityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for recovering silicon carbide, high-purity silicon and dispersion liquid from silicon material linear cutting waste mortar, which is characterized in that the solid and liquid separation on the waste mortar is carried out, recovered dispersing agents are obtained after the liquid is refined, solid is washed by water for further removing residual dispersing agents, then, flotation liquid is used for carrying out floatation for many times, crude silicon carbide and crude silicon powder are separated, the recovered silicon carbide is obtained after the crude silicon carbide is refined, the crude silicon powder is treated through acid cleaning, drying, melting, plasma refining, vacuum refining, unidirectional solidification and the like, and the solar grade polysilicon is obtained. The method has the advantages that the important indexes such as the viscosity, the acid-base degree and the like of the recovered dispersing agents are more similar to those of the novel dispersing liquid, more cutting capability of the silicon carbide can be recovered after the silicon carbide is subjected to the silicon corrosion treatment, metal impurities in high-purity silicon powder are removed, an important index of the phosphorus and boron content of the solar grade silicon is reduced to a value conforming to the solar grade silicon requirements that the phosphorus is lower than 0.01 ppmw and the boron is lower than 0.16ppmw, and the attenuation of the photoelectric conversion efficiency is greatly reduced after solar batteries are made.

Description

technical field [0001] The invention relates to the field of recovery and reuse of silicon wire cutting waste mortar, in particular to a method for recovering silicon carbide, high-purity silicon and dispersion liquid from silicon wire cutting waste mortar. Background technique [0002] Whether it is monocrystalline silicon or polycrystalline silicon, semiconductor silicon or crystalline silicon for solar energy, it must be cut before it flows into the next step of use. In the existing cutting technology, wire cutting is the best choice. High rate, high efficiency, low loss and so on. [0003] The principle of wire cutting is: use silicon carbide and polyethylene glycol dispersion to prepare a mortar with a certain viscosity. Driven by the high-speed moving steel wire, the silicon carbide in the mortar will rub against the material to be cut at a high speed locally. The hardness of silicon is much higher than that of the material to be cut. Silicon carbide can scrape off a ...

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): C01B31/36C30B29/06C30B28/06C10M175/00
Inventor 刘荣隆郑敏吴雄德
Owner 刘荣隆
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