production of slag for silicon refining molten sog solar

  • Production of Solar Grade (SoG) Silicon by Refining Liquid

    Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon ABSTRACT Pyro-metallurgical refining techniques are being developed for use with molten metallurgical grade (MG) silicon so that directionally solidified refined MG silicon can be used as solar grade (SoG) silicon feedstock for photovoltaic applications.

  • (PDF) Production of Solar Grade (SoG) Silicon by Refining

    Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon: Final Report, 19 April 2001 Article (PDF Available) · August 2001 with 133 Reads How we measure 'reads'

  • Production of Solar Grade (SoG) Silicon by Refining Liquid

    Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon Table of Contents Page No. Table of Contents i List of Figures and Tables ii ABSTRACT iv 1. INTRODUCTION 1 2. BACKGROUND 3 3. OUTLINE OF CURRENT PROGRAM 5 4. MG SILICON FEEDSTOCK 6 5. REFINING OF MG SILICON IN MOLTEN STATE 8 6. EXPERIMENTAL SETUP 13 7

  • An Evolving Method for Solar-Grade Silicon Production

    To reduce its energy consumption and pollution, new metallurgical refining processes of SoG-Si using metallurgical grade silicon (MG-Si) as a starting material have been developed, such as slag

  • Processes for Upgrading Metallurgical Grade Silicon to

    With regard to the uniqueness of directional solidification on removal a wide range of impurities from silicon, it is expected 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

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  • Production of solar grade (SoG) silicon by refining liquid

    Apr 09, 2020· Pyro-metallurgical refining techniques are being developed for use with molten metallurgical-grade (MG) silicon so that directionally solidified refined MG silicon can be used as solar-grade (SoG) silicon feedstock for photovoltaic applications. The most problematic impurity elements are B and P because of their high segregation coefficients. Refining processes such as evacuation,

  • Cited by: 2
  • Slag refining of silicon and silicon alloys : a review

    In order to optimize the B removal during slag-refining process for solar-grade silicon production, a new process for the removal of B in molten Si was proposed based on the principle of oxidized

  • Production of Solar Grade (SoG) Silicon by Refining Liquid

    Aug 06, 2001· @article{osti_786367, title = {Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon: Final Report, 19 April 2001}, author = {Khattak, C P and Joyce, D B and Schmid, F}, abstractNote = {This report summarizes the results of the developed technology for producing SoG silicon by upgrading MG silicon with a cost goal of $20/kg in large-scale production.

  • (PDF) Production of solar-grade silicon by refining of

    Refining of MG silicon involves upgrading reactions in the molten phase of silicon where diffusion and reaction rates can be higher compared to the solid state. Molten silicon with

  • Electrochemical Slag-Metal Reaction for Silicon Production

    alternative raw material for refining of MG-silicon to produce SOG-Si. The slag treatment on MG-Si for SOG-Si production is based on the principle of liquid-liquid extraction in steel industry. The slag used for the extraction of impurities must dissolve individual impurities better than molten silicon does, the solubility of silicon in the

  • Production of solar grade (SoG) silicon by refining liquid

    @article{osti_753817, title = {Production of solar grade (SoG) silicon by refining liquid metallurgical grade (MG) silicon: Annual Report: June 10 1998--October 19, 1999}, author = {Khattak, C P and Joyce, D B and Schmid, F}, abstractNote = {Pyro-metallurgical refining techniques are being developed for use with molten metallurgical-grade (MG) silicon so that directionally solidified refined

  • Development of Solar Grade (SoG) Silicon (Technical Report

    @article{osti_922203, title = {Development of Solar Grade (SoG) Silicon}, author = {Joyce, David B and Schmid, Frederick}, abstractNote = {The rapid growth of the photovoltaics (PV) industry is threatened by the ongoing shortage of suitable solar grade (SoG) silicon. Until 2004, the PV industry relied on the off spec polysilicon from the electronics industry for feedstock.

  • Study of boron removal from molten silicon by slag

    1. Introduction. The rapid growth of the photovoltaics (PV) industry has resulted in a severe shortage of solar-grade Si (SoG-Si). Metallurgical-grade Si (MG-Si) must be refined prior to the removal of certain impurities because it is the raw material used in the production of SoG-Si,,,.Boron (B) impurity higher than 0.3 ppmw could severely decrease the photoelectric conversion efficiency.

  • Distribution of impurity elements in slag–silicon

    A series of slag–metal experiments was first carried out to determine the reaction time needed for the system to reach equilibrium. A slag of composition 30% Al 2 O 3 –40% CaO–10% MgO–20% SiO 2 (by weight) was equilibrated with Si alloy at 1500 °C at six reaction times up to 6 h. Analysis of Si at the completion of each run showed that the concentration of phosphorus and boron became

  • Thermodynamics of solar-grade-silicon refining ScienceDirect

    In the present paper, the purification process for the solar grade silicon SOG-Si of which the required purity is 7 N, and the thermodynamic considerations and evaluation of the refining process are discussed. Additionally, the refining process for SOG-Si production was evaluated.

  • Processes for Upgrading Metallurgical Grade Silicon to

    The global shortage of solar grade silicon for the production of photovoltaic cells has motivated many re-searches on the refining of silicon, especially the refining of metallurgical-grade silicon.

  • Silicon Production by Molten Salt Electrolysis SpringerLink

    For industrial use, silicon can be classified into three categories according to their purity: metallurgical grade silicon (MG-Si, 2N), solar grade silicon (SOG-Si, 6N–7N), and semiconductor grade silicon (SEG-Si, 11N–12N).

  • Advances in Materials Science and Engineering

    Removal methods of impurity from metallurgical-grade silicon (Si) are intensively studied to produce solar-grade silicon (SoG-Si) with a smaller economical load and lower cost. Removal of phosphorus (P) has been an important issue because of difficulties in application of conventional metallurgical methods such as solidification refining. Because P evaporates preferentially from molten Si due

  • Purification of silicon for photovoltaic applications

    1. Introduction. The rapidly growing market for solar modules is fed at 80% by silicon wafers coming from ingots or monocrystals. Depending on the crystallization process and the subsequent manufacturing process of solar cells, the silicon charge provided to the furnaces has to fulfill different purity criteria; each client thus has its own “solar grade silicon” definition, which replaces

  • Development of solar grade silicon refining via

    As a new promising route for solar grade silicon (SOG-Si) production, metallurgical refining processes was developed in the early eighties of the last century, followed by the establishment of NEDO-JFE process in the beginning of the 2000s, where P was removed by electron beam (EB) in vacuum conditions and B by Ar-H2O plasma.

  • Thermodynamics on SOG-Si Refining Processes

    Thermodynamics on SOG-Si Refining Processes Institute of Industrial Science, and Waste Management) ・Microwave Processing for Recycling and Waste Treatment ・Thermodynamics and Processing on Solar Grade Silicon (SOG-Si) Production 2 Slag SiO 2 Crucible Molten Si-Mg Alloy Molten MgSiO 3, SiO 2 satd.MgO-SiO 2-Al 2 O 3 Slag MgSiO 3

  • Production of low-cost solar grade (SoG) silicon feedstock

    May 24, 2002· When the refining process is followed by directional solidification, it can be used for upgrading metallurgical grade (MG) silicon to produce solar grade (SoG) silicon. For the long term, total processing in an MG silicon production plant can result in $10/kg SoG silicon feedstock.

  • Development of Solar Grade Silicon (SoG-Si) Feedstock by

    Pyro-metallurgical refining techniques are being developed for use with molten metallurgical-grade (MG) silicon so that directionally solidified refined MG silicon can be used as solar-grade (SoG) silicon feedstock for photovoltaic applications. The most problematic impurity elements are B and P because of their high segregation coefficients.

  • Advances in Materials Science and Engineering

    Removal methods of impurity from metallurgical-grade silicon (Si) are intensively studied to produce solar-grade silicon (SoG-Si) with a smaller economical load and lower cost. Removal of phosphorus (P) has been an important issue because of difficulties in application of conventional metallurgical methods such as solidification refining. Because P evaporates preferentially from molten Si due

  • Production of solar grade (SoG) silicon by refining liquid

    This report summarizes the results of the developed technology for producing SoG silicon by upgrading MG silicon with a cost goal of$20/kg in large-scale production. A Heat Exchanger Method (HEM) furnace originally designed to produce multicrystalline ingots was modified to refine molten MG silicon feedstock prior to directional solidification.

  • Development of Solar Grade (SoG) Silicon UNT Digital Library

    Jan 18, 2008· The rapid growth of the photovoltaics (PV) industry is threatened by the ongoing shortage of suitable solar grade (SoG) silicon. Until 2004, the PV industry relied on the off spec polysilicon from the electronics industry for feedstock. The rapid growth of PV meant that the demand for SoG silicon predictably surpassed this supply. The long-term prospects for PV are very bright as costs have

  • Thermodynamics on SOG-Si Refining Processes

    Thermodynamics on SOG-Si Refining Processes Institute of Industrial Science, and Waste Management) ・Microwave Processing for Recycling and Waste Treatment ・Thermodynamics and Processing on Solar Grade Silicon (SOG-Si) Production 2 Slag SiO 2 Crucible Molten Si-Mg Alloy Molten MgSiO 3, SiO 2 satd.MgO-SiO 2-Al 2 O 3 Slag MgSiO 3

  • Development of solar grade silicon refining via

    As a new promising route for solar grade silicon (SOG-Si) production, metallurgical refining processes was developed in the early eighties of the last century, followed by the establishment of NEDO-JFE process in the beginning of the 2000s, where P was removed by electron beam (EB) in vacuum conditions and B by Ar-H2O plasma.

  • Production of Solar Grade (SoG) Silicon by Refining Liquid

    This report summarizes the results of the developed technology for producing SoG silicon by upgrading MG silicon with a cost goal of $20/kg in large-scale production. A Heat Exchanger Method (HEM) furnace originally designed to produce multicrystalline ingots was modified to refine molten MG silicon feedstock prior to directional solidification.

  • Utilization value of silicon slag

    Steel casting industry insiders know that some after refining silicon slag is left over from the original silicon ore, but also contains a lot of silicon, silicon slag as one of production enterprises large number of procurement of metallurgical materials, has an irreplaceable advantage, because the purpose of the silicon is different, there are many different kinds of silicon slag and slag

  • Refining and Recycling of Silicon: A Review

    recycling and refining of silicon for photovoltaics (PV). 1 SILICON . Silicon (Si) is the second member in the Group IVA in the periodic system of elements. It never occurs free in nature, but in combination with oxygen forming oxides and silicates. Most of the Earth’s crust is made up of silica and miscellaneous silicates associated with

  • REMOVING BORON FROM METALLURGICAL GRADE

    volatility compared to silicon [7]. The molten slag refining is a traditional method using in the purification of steel making [8]and it was also proved that the molten slag refining based on calcium sillicate system is an efficient agent of removing boron from molten metallurgical grade silicon

  • Solar Grade Silicon Refining and Silicide Production

    Titanium silicide (Ti 5 Si 3) is a promising new material for very-high-temperature structural applications.We propose a pyro-metallurgical method to synthesize Ti 5 Si 3 from titanium bearing slag and molten silicon at high temperature for reducing the production cost and elevating the quality of it. Thermodynamic properties of titanium bearing slag and kinetics of the process was studied.

  • Production of solar-grade silicon by refining of liquid

    Mar 27, 2008· The growth of the photovoltaic industry will be limited by the availability of silicon feedstock. Currently, feedstock supplies are scraps and surplus from the microelectronics industry. A program has been initiated to produce solar grade (SoG) silicon by upgrading metallurgical grade (MG) silicon using pyrometallurgical techniques in the liquid state followed by directional solidification.

  • Development of Solar Grade Silicon (SoG-Si) Feedstock by

    Pyro-metallurgical refining techniques are being developed for use with molten metallurgical-grade (MG) silicon so that directionally solidified refined MG silicon can be used as solar-grade (SoG) silicon feedstock for photovoltaic applications. The most problematic impurity elements are B and P because of their high segregation coefficients.

  • Distribution of impurity elements in slag silicon

    Distribution of Impurity Elements in Slag-Silicon Equilibria for Oxidative Refining of Metallurgical Silicon for Solar Cell Applications elements between the molten silicon and slag was examined in terms of the basicity and oxygen mainly been used as the starting material for producing solar-grade silicon (SoG-Si) (99.9999%

  • Thermodynamic criteria of the end-of-life silicon wafers

    The re-melting process of EoL silicon wafers with oxide-slag treatment was simulated. The elimination of a given impurity element, M, can be quantitatively presented by its equilibrium distribution ratio between molten silicon and the oxide slag (Lslag/silicon), and that between molten silicon and the gas phase (Lgas/silicon) [26–33].