vacuum distillation refining of metallurgical grade silicon

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  • REMOVING BORON FROM METALLURGICAL GRADE .

    REMOVING BORON FROM METALLURGICAL GRADE SILICON BY A HIGH BASIC SLAG REFINING TECHNIQUE J.J. Wu a,b,c*, K. Liu b,c, M. Xu b,c, W.H. Ma a,b,c*, B. Yanga,b, Y.N. Daia,b,c aState Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization/The National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, China

    • Published in: Journal of Mining and Metallurgy, Section B · 2014Authors: J J Wu · M Xu · K Liu · W H Ma · B Yang · Y N DaiAbout: Boron · Partition coefficient · BaseGet Price
    • Refining Silicon

      The resulting silicon is metallugical grade silicon (MG-Si). It is 98% pure and is used extensively in the metallugical industry. Metallurgical silicon production and typical impurity levels. The fraction used for semiconductors is very small and the fraction used for photovoltaics is a small fraction of that.

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    • Upgrade Metallurgical Grade Silicon | SpringerLink

      The main process is described in detail, including smelting and secondary refining of metallurgical-grade silicon and acid leaching treatment. Other technologies also are introduced and discussed: solvent refining, vacuum treatment, plasma refining, and electron beam treatment; these technologies are used to refine metallurgical-grade silicon.

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    • Solvent Refining of Metallurgical Grade Silicon Using Iron

      Solvent Refining of Metallurgical Grade Silicon Using Iron Shaghayegh Esfahani Master of Applied Science Materials Science and Engineering University of Toronto 2010 Abstract Purification of metallurgical grade silicon (MG- Si) by a combination of solvent refining and .

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    • 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.

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    • Vanquish Vacuum Distillation Difficulties | Chemical ...

      Mar 12, 2014 · Vacuum control for a distillation tower is most commonly obtained by recycling load from the discharge of the first-stage ejector back to its suction. This allows one to manipulate the load to control the process vacuum.

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    • Effects of Applied Power on Temperature of Electromagnetic ...

      The effects applied power on temperature were observed and analyzed. The results of this investigation will use vacuum electromagnetic levitation technology solar grade silicon samples will be prepared from relative inexpensive raw material, metallurgical grade silicon.

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    • Refining Silicon | PVEducation

      The impurity levels in metallurgical grade silicon5 6 vary widely due to process variation and the source raw materials of silica and carbon. Electronic Grade Silicon. A small amount of the metallurgical grade silicon is further refined for the semiconductor industry. Powdered MG-Si is reacted with anhydrous HCl at 300 °C in a fluidized bed reactor to form SiHCl 3. Si + 3HCl → SiHCl 3 + H 2

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    • Refining Silicon for Solar Cell Application by Copper Alloying

      Dec 22, 2009 · In this research, a new method for refining metallurgical grade silicon to solar grade silicon is investigated. Methods The main steps include alloying with copper, solidification, grinding and gravity separation.

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    • Kinetics of Boron Removal from Metallurgical Grade Silicon ...

      The removal of non-metallic impurity boron in metallurgical grade silicon (MG-Si) can be carried out by using a slag refining technique based on CaO-SiO 2 system. However, the boron removal in depth in the slag refining process is limited by the kinetic conditions.

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    • Vacuum Refining of Molten Silicon

      Vacuum Refining of Molten Silicon JAFAR SAFARIAN and MERETE TANGSTAD Metallurgical fundamentals for vacuum refining of molten silicon and the behavior of different impurities in this process are studied. A novel mass transfer model for the removal of volatile impurities from silicon in vacuum induction refining is developed.

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    • Advances in Materials Science and Engineering - Hindawi

      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.

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    • Purification of metallurgical grade silicon by a solar process

      Purification of metallurgical grade silicon by a solar process G. Flamanta,, V. Kurtcuoglub, J. Murraya, A. Steinfeldb,c aProcesses, Materials and Solar Energy Laboratory (PROMES)-CNRS, 7 rue du four solaire, Odeillo, 66120 Font Romeu, France1 bDepartment of Mechanical and Process Engineering, ETH-Swiss Federal Institute of Technology Zurich,

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    • Precipitation Phase and Impurities Distribution of ...

      Precipitation phase and impurities distribution of MG-silicon were investigated by vacuum refining followed by slag treatment, and the CaO-SiO2-CaF2 system was adopted for slag treatment. Contrasting the microstructure of precipitated phase in slag treatment with and without vacuum refining pretreated, it could be concluded that the composition of precipitated phases, obtained in MG-Si after ...

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    • 14 Egypt. J. Chemals.ekb.eg

      for the production of solar grade silicon (SOG-Si) of 99.9999 % purity is a challenging task and the subject of recent world's wide research. These developed methods involve separation of impurities from silicon by acid leaching, slag refining, vacuum distillation, directional solidification [5-7]. Among

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    • Silicon refining process - Elkem Metals Company L.P.

      Oct 13, 1998 · Refining of metallurgical-grade silicon is generally conducted on the liquid (molten) silicon either by oxidation or chlorination. The chlorination method has environmental problems associated with the use of chlorine and the emission of corrosive metal chlorides, thus the oxidation method is primarily used in the silicon industry.

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    • NOT - NASA

      pyrometallurgical purification step to achieve solar-grade meltstock quality. REFINING OF MG-SILICON The production of metallurgical-grade silicon in electric arc furnaces is a technically well established large-scale process. The ncminal capacity of all existing furnaces in the Western World is known to be between 600.000 and 650.000 tons

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    • Cheaper Silicon for Photovoltaics: Siemens Process vs ...

      Jun 27, 2018 · This metallurgical grade silicon is produced by reducing silica from quartz sand with carbon: SiO2(l)+2C(s)=Si(l)+2CO(g). Next, carbon electrodes are often used in a furnace to create temperatures of around 2000°C, so that many impurities become volatile.

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    • (PDF) Vacuum Refining of Molten Silicon | Merete Tangstad ...

      Vacuum Refining of Molten Silicon JAFAR SAFARIAN and MERETE TANGSTAD Metallurgical fundamentals for vacuum refining of molten silicon and the behavior of different impurities in this process are studied.

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    • 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.

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    • 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.

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    • Exergy Analysis of Metallurgical-grade Silicon in Vacuum ...

      Exergy Analysis of Metallurgical-grade Silicon in Vacuum Induction Refining Process. Mingyu Zhang 1, Xi Yang 1, Guoqiang Lv 2 and Wenhui Ma 2. Published under licence by IOP Publishing Ltd IOP Conference Series: Earth and Environmental Science, Volume .

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    • Refining Metallurgical Grade Silicon by Chlorination ...

      A supply shortage of solar-grade silicon in recent years resulted from a rapid expansion of the solar cell industry. Therefore, many efforts have been done to obtain reliable metallurgical methods for production of SoG silicon from metallurgical grade silicon. In this research, refining of metallurgical grade silicon by chlorination treatment with

      • Author: Mahboob Bolandi[PDF]Get Price
      • Removal of Phosphorus from Silicon Melts by Vacuum .

        Induction vacuum refining testwork has been carried out for the removal of phosphorus from silicon melts. This work is of interest for the production of solar-grade silicon since phosphorus is hard to remove from silicon and is an important impurity in solar cells. The

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      • Upgrading of Metallurgical Grade Silicon - NTNU

        Upgrading of Metallurgical Grade Silicon Seminar – at the coastal express Trondheim - Tromsø, Norway, April 24-26, 2012 In the early spring of 2012 the coastal express will host the seminar of UMG silicon processes arranged by NTNU and SINTEF.

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      • Phosphorus removal from upgraded metallurgical-grade ...

        Abstract. Vacuum refining is considered relatively effective for removing phosphorus from molten silicon. Based on the saturated vapor pressure of phosphorus calculated, the removal of phosphorus from UMG-Si at 1823K was performed via an industrial-scale vacuum directional solidification (VDS) furnace in this paper.

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        • Refining and Recycling of Silicon: A Review - USP

          The present fumed silica market is about 100 000 to 120 000 MT, which in turn consumes around 50 000 to 60 000 MT of metallurgical silicon. It is noted that the main market for fumed silica is as additives in silicone rubbers used to increase the mechanical strength and the elasticity of these elastomers.

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        • Refining and Recycling of Silicon: A Review - USP

          of metallurgical grade silicon, also called silicon metal in the industry because of its appearance and not because of its physical properties, are produced and sold in the world market.

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        • Purification of Magnesium by Vacuum Distillation and its ...

          To this end, according to impurities in molten silicon and solid silicon demonstrated various characteristics and existence forms, in this paper we used acid leaching, directional solidification, electron and magnetic field, vacuum melting, blow reactive gases and so on to fabricate solar grade silicon from metal silicon in theory to analyze and optimize process.

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

          OSTI.GOV Technical Report: Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon: Final Report, 19 April 2001. Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon: Final Report, 19 April 2001. Full Record;

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