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production of slag for silicon refining molten sog solar

Processes for Upgrading Metallurgical Grade Silicon to Solar Grade .The most cost-effective and direct approach for producing SoG-Si is to purify and upgrade metallurgical-grade silicon. Many impurities in MG-Si can be effectively removed . It is shown that under development silicon refining processes are applicable to produce solar grade silicon. However, there are specific challenges for.production of slag for silicon refining molten sog solar,Production of Solar Grade (SoG) Silicon by Refining Liquid .Apr 19, 2001 . August 2001 • NREL/SR-520-30716. Production of Solar Grade. (SoG) Silicon by Refining. Liquid Metallurgical Grade. (MG) Silicon. Final Report . The variable P may be due to slag inclusions in sampling. 29. 12 . was modified to refine molten MG silicon feedstock prior to directional solidification.

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production of slag for silicon refining molten sog solar,Processes for Upgrading Metallurgical Grade Silicon to Solar Grade .Dec 22, 2017 . that this process will continue to be a part of the best developed process for SoG-Si production. 3.2. Slag refining. Slag refining technique is a process candidate for mainly B removal in which the boron impurity in. molten silicon is oxidized and removed by a molten silicate slag. The related chemical.production of slag for silicon refining molten sog solar,Study of boron removal from molten silicon by slag refining under .Sep 16, 2013 . Slag refining. Mass transfer coefficient. Optical basicity. a b s t r a c t. Solar energy is expected to be in great demand within the next few years. In relation to this, a global shortage in the solar-grade silicon (SoG-Si) used in the production of solar cells has motivated numerous studies on metallurgical-grade.

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21 Comment on production of slag for silicon refining molten sog solar

Paper Title (use style: paper title) - Atlantis Press

Abstract—In recent years, more and more attentions have been paid to the research of producing solar grade silicon by the metallurgical method,boron removal has always been difficult and important in various technologies. In this paper the recent research on removing boron is summarized. The boron removal is.

Application of Electron Beam Melting to the Removal of Phosphorus .

Sep 16, 2013 . Removal methods of impurity from metallurgical-grade silicon (Si) are intensively studied to produce solar-grade silicon (SoG-Si) with a smaller . refining. Because P evaporates preferentially from molten Si due to its high vapor pressure, electron beam (EB) melting has been applied to the purification of Si.

Production of Solar Grade (SoG) Silicon by Refining Liquid . - NREL

Production of Solar Grade. (SoG) Silicon by Refining Liquid. Metallurgical Grade (MG). Silicon. Annual Report. June 10 1998 October 19, 1999. National Renewable Energy .. Pyro-metallurgical refining techniques are being developed for use with molten metallurgical ... species and separated from MG silicon in a slag.

Processes for Upgrading Metallurgical Grade Silicon to Solar Grade .

The most cost-effective and direct approach for producing SoG-Si is to purify and upgrade metallurgical-grade silicon. Many impurities in MG-Si can be effectively removed . It is shown that under development silicon refining processes are applicable to produce solar grade silicon. However, there are specific challenges for.

Novel Recycling Method for Boron Removal from Silicon by . - MDPI

Sep 29, 2017 . Keywords: silicon; recycling; refining; solar cell; plasma; boron. 1. Introduction. Recently, sustainable . refining, slag refining, hydrometallurgy, solvent refining, and plasma refining [14–18]. Boron (B), one of the major . of B was added into the molten Si to produce B-doped Si. The concentration of B in the.

Processes for Upgrading Metallurgical Grade Silicon to Solar Grade .

Dec 22, 2017 . that this process will continue to be a part of the best developed process for SoG-Si production. 3.2. Slag refining. Slag refining technique is a process candidate for mainly B removal in which the boron impurity in. molten silicon is oxidized and removed by a molten silicate slag. The related chemical.

Application of Electron Beam Melting to the Removal of Phosphorus .

Sep 16, 2013 . Removal methods of impurity from metallurgical-grade silicon (Si) are intensively studied to produce solar-grade silicon (SoG-Si) with a smaller . refining. Because P evaporates preferentially from molten Si due to its high vapor pressure, electron beam (EB) melting has been applied to the purification of Si.

production of slag for silicon refining molten sog solar,

Study on the Preparation of Solar Grade Silicon by Metallurgical .

May 31, 2017 . Keywords: metallurgical grade silicon, solar grade silicon, acid leaching, electron beam melting, electromagnetic induction slag melting . More and more attentions have been paid to the research of producing solar grade silicon (SOG‐Si) by refining metallurgical grade silicon. Metallurgical route is.

boron removal from molten silicon by gas blowing . - BIBSYS Brage

Jul 26, 2016 . Slag refining was proposed as a metallurgical refining method relatively recently, in. 1981 by Dietl and Wohlschlaeger [7]. Data for Boron removal with slag refining are so far still limited. Industrial production of SoG-Si through metallurgical routes was effectively carried out by Elkem Solar [8], using a.

Removal of B from Si by Hf addition during Al–Si solvent refining .

Reducing the cost of producing solar-grade Si (SoG-Si) is important for . H2O-added plasma melting [3, 4] and slag treatment. [5–8] are currently ... [2] Safarian J, Tangstad M. Vacuum refining of molten silicon. Metall Mater Trans B. 2012; 43:1427–1445. [3] Nakamura N, Baba H, Sakaguchi Y, et al. Boron removal in.

Review of New Technology for Preparing Crystalline Silicon Solar .

Oxidative refining. Cai et al. used a ternary system of 55% CaO-30% SiO2-15% Na2O, according to a certain proportion of slag and silicon, to introduce a gas of 99.5% Ar-0.5% H2O at a flow rate of 18 L / . preparation process can realize the whole melting state of silicon to polycrystalline silicon solar cell material.

Thermodynamics of Impurity Removal in Solvent Refining of Silicon .

The major challenge in producing solar silicon that operates efficiently is to meet ... ing SoG silicon. Since the metallurgical refining techniques are selective in removing the impurities of MG-Si, various combinations of these processes can be .. by slag refining and directional solidification to improve the purity of silicon.

Boron removal from metallurgical grade silicon using a CaO–Li2O .

Boron removal from metallurgical grade silicon using a CaO–Li2O–SiO2 molten slag refining technique. Jijun Wu a,b,⁎, Wenhui Ma a,b, Binjie Jia a,b, Bin Yang a, . SoG-Si with a purity of 99.9999% (6N) is the basic material for the production of solar cell. Boron will reduce the photoelectric conversion efficiency in silicon.

US7727503B2 - Method for purifying silicon - Google Patents

US20050139148A1 2002-02-04 2005-06-30 Hiroyasu Fujiwara Silicon purifying method, slag for purifying silicon and purified silicon. WO2007112592A1 2006-04-04 . US4193974A * 1977-11-21 1980-03-18 Union Carbide Corporation Process for producing refined metallurgical silicon ribbon. US4193975A * 1977-11-21.

Removal of B from Si by Hf addition during Al–Si solvent refining .

Feb 23, 2016 . Reducing the cost of producing solar-grade Si (SoG-Si) is important for manufacturing low-cost Si solar cells. One promising method involves . Some processes such as oxidation through H2O-added plasma melting [3, 4] and slag treatment [5–8] are currently employed for B removal. However, a further.

Jafar Safarian - NTNU

Purification of silicon for solar applications; vacuum refining, slag refining, gas refining, etc. Production of alumina; Thermodynamics and phase relations in metallurgical systems; Kinetics of metallurgical reactions (reduction, oxidation, gasification, evaporation, .) Hydrometallurgy . (2012) Vacuum refining of molten silicon.

production of slag for silicon refining molten sog solar,

Conventional and Advanced Purification Processes of MG Silicon

3.3.2.1 Solvent Growth Refining; 3.3.2.2 Wet-Chemical Aluminum Removal; 3.3.2.3 DS and Final Preparation. 3.4 Conclusions; References. 3.1 Introduction. Studies and developments of processes which could be used to convert metallurgical grade (MG)-silicon or any kind of impure silicon in a solar grade (SoG) feedstock.

High purity composite briquette for direct UMG-Si production in arc .

chemical refining) would reach an unacceptably high cost portion of 20 %. The development of a low cost specific metallurgical route for the production of Solar Grade (SoG) Si at 15$/kg is therefore gaining a strong interest. . of SoG-Si grade Si are contemplated. Index Terms — Photovoltaic cells, metallurgical, silicon, arc.

Effect of solidification conditions on the silicon growth and refining .

solidification with the aim of developing a novel low-cost route for solar-grade Si production. The . sustainable process for producing SOG-Si – metallurgical refining – uses MG-Si as a starting material and may . slag refining [3-5], oxidation with plasma melting [6-9], and vacuum melting [10, 11] has been investigated.

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