Behavior and State of Boron in CaO-SiO_2 Slags during Refining of Solar Grade Silicon

スポンサーリンク

概要

• 論文の詳細を見る

• The thermodynamics of boron removal during the refining of solar grade silicon by slag treatment was investigated using CaO–SiO2 slags. The partition ratio of boron between slag and silicon phases and the state of boron in slag were investigated for a composition range of CaO/SiO2 between 0.55–1.21, and for boron concentrations varying from 50 ppm to 0.25 wt% at 1823 K. The best boron partition ratios were attained for CaO/SiO2 values of 1.21 and 0.55 (5.5 and 4.3, respectively), and it had a minimum value of 1.9 for a CaO/SiO2 value of around 0.8. The dependence of the boron distribution with content between silicon and slag phase showed that boron exists as a monomer for all the slag compositions studied in this work. A thermodynamic evaluation of the system was carried out by calculating the activity coefficient of BO1.5, revealing a decrease in the activity coefficient with an increase in the silica content when the CaO/SiO2 ratio was lower than 0.8. The decrease in the activity coefficient was attributed to the incorporation of boron oxide in the silicate network present in slags having high silica content. This assumption was confirmed by solid state 11B NMR analysis and supported by quantum chemical calculations.

• 社団法人 日本鉄鋼協会の論文
• 2009-06-15

著者

• YOKO Toshinobu

  Institute for Chemical Research, Kyoto University

• Morita Kazuki

  Institute Of Industrial Science The University Of Tokyo

• TEIXEIRA Leandro

  Institute of Industrial Science, The University of Tokyo

• TOKUDA Yomei

  Institute for Chemical Research Kyoto University

• Yoko Toshinobu

  Institute For Chemical Research Kyoto University

• Teixeira Leandro

  Institute Of Industrial Science The University Of Tokyo

関連論文

• Origin of Intrinsic Second-Harmonic Generation in Crystallized GeO_2-SiO_2 Glass Films
• High Photoluminescent Property of Low-Melting Sn-Doped Phosphate Glass
• Conducting and Magnetic Properties of 1-Ethyl-3-methylimidazolium (EMI) Salts Containing Paramagnetic Irons : Liquids [EMI][M^Cl_4] (M = Fe and Fe_Ga_) and Solid [EMI]_2[Fe^Cl_4]
• Three-Dimensional Microdrilling of Glass by Multiphoton Process and Chemical Etching
• Removal of Boron from Molten Silicon Using CaO-SiO_2 Based Slags
• Recent Progress of EPM in Steelmaking, Casting, and Solidification Processing
• Behavior and State of Boron in CaO-SiO_2 Slags during Refining of Solar Grade Silicon
• Control of Si Crystal Growth during Solidification of Si-Al Melt
• Continuous Solidification of Si from Si-Al Melt under the Induction Heating
• Effects of 28GHz/2.45GHz Microwave Irradiation on the Crystallization of Blast Furnace Slag
• Activities of SiO_2 in Some CaO-Al_2O_3-SiO_2(-10%MgO) Melts with Low SiO_2 Contents at 1873K
• Evaluation of Hydrothermal Treatment to Immobilize Hexavalent Chromium in Wastewater Using Granulated Blast Furnace Slag
• Reaction Mechanisms of Blast Furnace Slag in Liquid and Vapor Dominated Hydrothermal Systems
• Effect of Microwave Irradiation on Hydrothermal Treatment of Blast Furnace Slag
• Occurrence and lithofacies of shungite : early Proterozoic carbon-rich rocks from Karelia, northwestern Russia
• Evaluation of Phase Diagrams for the Al_2O_3-CaO-SrO System by In-Situ Observation Using Confocal Laser Microscope
• Aluminum Deoxidation Equilibrium of Molten Iron-Aluminum Alloy with Wide Aluminum Composition Range at 1873K
• High efficient white light emission of rare earth-free MnO–SnO–ZnO–P2O5 glass
• Silicophosphate/silicophosphite hybrid materials prepared by solventless ethanol condensation
• Preparation of Phenyl-modified Siloxane Glasses with Softening Temperature Controlled by Rapid Heat Treatment (RHT)
• Effect of Sulfur Doping on the Structure and Properties of La_Sr_xCuO_4 Superconductor
• Preparation of Superconducting Bi-Sr-Ca-Cu-O Coating Films by the Sol-Gel Method Using an Aqueous Solution of Metal Acetates
• Sol-Gel Preparation and Nonlinear Optical Properties of Transition Metal Oxide Thin Films
• Preparation of Lead-Based Perovskite Films by Sol-Gel Method and Their Properties : Thin Films
• Ruthenium Solubility and Dissolution Behavior in Molten Slag
• Thermodynamic Properties of the MgO-BO_, CaO-BO_, SiO_2-BO_, MgO-BO_-SiO_2 and CaO-BO_-SiO_2 Slag Systems at 1873K
• Erratum to “Thermodynamics of Si and Ti in Solid Fe at 1273 K” [ISIJ International 51 (2011), No 12, pp. 2002–2006]
• Thermodynamics of Si and Ti in Solid Fe at 1273 K
• Inhomogeneous distribution of Na+ in alkali silicate glasses
• Origin of Intrinsic Second-Harmonic Generation in Crystallized GeO2–SiO2 Glass Films
• Growth of $\beta$-FeSi2 Layers on Si(100) Substrates by Exchange Reaction between Si and Molten Salts
• Occurrence and lithofacies of shungite: early Proterozoic carbon-rich rocks from Karelia, northwestern Russia
• Localized Sn^ Emission Center Independent of the Optical Basicity of Zinc Phosphate Glass
• Sorption of Uranine on Forest Soils

もっと見る 閉じる

スポンサーリンク