production of slag for silicon refining molten sog solar

  • 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 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 Current Status And Future Plan For RRR Grade Niobium Production In Tokyo Denkai Hiroaki Umezawa Aug Molten Metal Technology

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    Processes for Upgrading Metallurgical Grade Silicon to Solar Grade Silicon low cost solar grade silicon SoG Si feedstock is demanded it is expected that this process will continue to be a part of the best developed process for SoG Si production 32 Slag refining Slag refining technique is a process candidate for mainly B removal in Solar Grade A Silicon Revolution Jul 20 2 30 PM ET there is a shortage of silicon refining capacity Most solar cell production lines today need 6N Solar Grade or SoG

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    Solar Grade Silicon by a Direct Metallurgical Process Eivind 216 vrelid1 Bart Geerligs2 Aud Wærnes1 Ola Raaness1 A direct metallurgical route for production of solar grade silicon can be five times more The principle of the three layer electro refining of Si in molten oxides at 176 CSlag refining of silicon is one of few feasible methods currently in use industrially for removal of boron in the production of silicon for photovoltaic applications In order tooptimize this process there is a need to enhance the understanding of the relationship between slag composition and the kinetics of boron transfer from metal to slag

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    A silicon refining process according to claim 1 wherein the reaction chamber is heated differentially as the molten silicon metal is flowed downwardly therethrough heating of the upper part of said chamber being such as to maintain the temperature therein only slightly above the melting temperature of said metal and heating of the lower part The Kinetics of Boron Removal during Slag Refining in the Production of Solar Grade Silicon Author Gabriella Tranell Download with Google Download with Facebook or download with email The Kinetics of Boron Removal during Slag Refining in the Production of Solar Grade Silicon

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    Production of low cost solar grade SoG silicon feedstock Abstract A simple refining process of blowing moist gases over molten silicon removed high segregation impurities especially B and P and reduced other impuritiVacuum refining of molten silicon is a process that can be growth of SoG Si production for PV industry many 26th European Photovoltaic Solar energy conference and exhibition September pp for aluminium and 147 kJ/mol for calcium Yuge and co

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    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 coefficientsThe dissolution behavior of boron in a molten slag was evaluated at K to establish the boron removal mechanism from silicon refining for preparing higher purity solar grade silicon

  • Silicon metal is a grey and lustrous semi conductive metal that is used to manufacture steel solar cells and microchips Silicon is the second most abundant element in the earth s crust behind only oxygen and the eighth most common element in the universe8 PRODUCTION OF SOLAR GRADE SOG SILICON BY REFINING LIQUID METALLURGICAL GRADE MG SILICON As mentioned most of the impurities can be removed by directional solidification as most impurities have a low partition ratio in silicon

  • Jan 01 32 This has brought a temporary relief to an otherwise strained market for solar grade silicon feedstock SoG Si qualiti Boron was extracted from the molten silicon to the slag phase granular silicon was melted and further refined to adjust the composition before crushing and sieving to obtain the silicon feedstock for RECYCLING OF SOLAR SILICON WASTE BY PARTICLE SEDIMENTATION UNDER ELECTROMAGNETIC FIELD solidification of molten solar grade silicon SoG Si and dominates the silicon PV market During the directional the production of SoG Si is lost during the production

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    Abstract In order to optimize a boron removal process by slag refining to obtain solar grade silicon the rate of boron removal from molten silicon using CaO SiO 2 slag was investigated at K in an Ar atmosphere The rate of boron removal was found to be controlled by mass transfer in molten slags and the mass transfer coefficient of boron in molten slag in the present experimental 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

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    The dissolution behavior of boron in a molten slag was evaluated at K to establish the boron removal mechanism from silicon refining for preparing higher purity solar grade siliconSilicon slag is used for steel slag refining pig iron ordinary casting etc Silicon slag can improve the furnace temperature increase the fluidity of molten iron effectively discharge slag increase the number and improve the toughness and cutting ability of castings

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    production costs of SoG Si effective removal of the aforementioned impurity elements is essential for producing silicon through metallurgical means 5 Electromagnetic levitation EML refining is an ideal technique for containerless processing of liquid metalsBoron Removal from Silicon by CaO Na 2O SiO 2 Ternary Slag JAFAR SAFARIAN GABRIELLA TRANELL and MERETE TANGSTAD Boron removal from silicon is an important issue for solar grade silicon feedstock production

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    Production of solar cells has increased rapidly in recent years and metallurgical production of solar grade silicon SoG Si has increased compared with more expensive processes such as Siemens process and Cz process It is important to understand the thermodynamic behavior of phosphorus in slag for optimized refinement of SoG SiThe global shortage of solar grade silicon for production of solar cells has motivated a lot of research on the refining of metallurgical grade silicon However approaches to upgrade metallurgical grade silicon have been mainly handicapped by difficulties in reducing boron and phosphorus levels

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    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 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