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Processes for Upgrading Metallurgical Grade Silicon to ...

Ji-Jun W, Wen-hui M, Bin Y, Yong-nian D, Morita K. Boron removal from metallurgical grade silicon by oxidizing refining. Trans. Nonferrous Met. China 2009; 19: 463.467. [32] Alemany C, Trassy C, Pateyron B, Li KI, Delannoy Y. Refining of metallurgical-grade silicon by inductive plasma. Solar Energy Materials & Solar Cells 2002; 72: 21-48. [33]

Refining Silicon | PVEducation

Refining Silicon. Silicon dioxide (SiO 2) is the most abundant mineral in the earth's crust. The manufacture of the hyperpure silicon for photovoltaics occurs in two stages. The oxygen is removed …

Calcium removal in purifying metallurgical-grade silicon ...

Calcium removal in purifying metallurgical-grade silicon by vacuum refining September 2014 Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology 34(9):978-983

26th European Photovoltaic Solar energy conference and ...

Keywords: Impurities, metallurgical grade, silicon, vacuum, refining . 1 INTRODUCTION . Vacuum distillation technique for the purification of molten metals and alloys has been developed mainly in …

Vacuum distillation refining of metallurgical grade ...

【】：The removal of impurity phosphorus from metallurgical grade silicon is one of the major problems on purification of metallurgical grade silicon for solar grade silicon preparation.The thermodynamics on vacuum refining process of the metallurgical grade silicon was studied via separation coefficient of impurity phosphorus in the metallurgical grade silicon and vapor-liquid ...

(PDF) Silicon refining by a metallurgical processing route ...

The silicon (raw material) along 70 mm from tions are similar to those described by concentrations of metallic impurities the ingot base, in which no intermetallic Yuge (Yuge et al., 2004) and Kuroda are …

Alternative Solar-Grade Silicon Feedstock Approaches: Preprint

Demand for reject electronics-grade silicon (EG-Si) feedstock will exceed the supply (8,000 metric tons/yr) by a factor of 2 to 4 by the year 2010. The photovoltaics industry would benefit from a low …

Removal of Phosphorus from Silicon Melts by Vacuum Refining

First and foremost I would like to thank my supervisors Professor Merete Tangstad and Doctor Jafar Safarian for the excellent guidance and support throughout this project. Moreove

US4138509A - Silicon purification process - Google Patents

A process for producing semiconductor grade silicon. Metallurgical grade silicon, silicon dioxide, and silicon tetrafluoride are chemically combined at an elevated temperature to form silicon difluoride …

High-Temperature Refining of Metallurgical-Grade Silicon ...

In a new approach for purification of metallurgical-grade silicon, Esfahani and Barati38,39 used a combination of solvent refining and physical separation using iron as the alloying element. In this process, solvent refining with Fe was followed …

Refining Silicon | PVEducation

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 …

US8329133B2 - Method and apparatus for refining ...

A method and apparatus for refining metallurgical silicon to produce solar grade silicon for use in photovoltaic cells. A crucible in a vacuum furnace receives a mixture of metallurgical silicon and a …

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

Metallurgical and Materials Transactions B, 2012. Merete Tangstad. Jafar Safarian. Merete Tangstad. Jafar Safarian. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER. Vacuum Refining of Molten Silicon.

Polysilicon Production: Siemens Process | Bernreuter Research

Upgraded metallurgical-grade silicon is fighting an uphill battle in a PV market where monocrystalline solar panels are dominating more and more. In view of emerging Chinese polysilicon giants with …

Study on Al Removal from MG-Si by Vacuum Refining ...

Phosphorus removal from metallurgical grade silicon by CaO-SiO2-CaCl2 slag treatment, HCl leaching, and vacuum refining was investigated. The effect …

Low-temperature purification process of metallurgical silicon

Vacuum distillation refining of metallurgical grade silicon (II): Kinetics on removal of phosphorus from metallurgical grade silicon [J] Transactions of Nonferrous Metals Society of China, 17 ( s1 ) ( 2007 ), pp. s1026 - s1029

Transactions of Nonferrous Metals Society of China2007S1 ...

Vacuum distillation refining of metallurgical grade silicon(Ⅱ)——Kinetics on removal of phosphorus from metallurgical grade silicon; 222. Removal of iron and aluminum impurities from metallurgical …

The 18th International Vacuum Conference (IVC-18)

Vacuum distillation as an effective purification method has been used in the preparation of high-purity bismuth [14] and the refining of the metallurgical grade silicon [15,16], etc. But the purification of …

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 …

vacuum distillation refining of metallurgical grade silicon

Vacuum distillation refining of metallurgical grade 【】：The removal of impurity phosphorus from metallurgical grade silicon is one of the major problems on purification of metallurgical grade …

Characterization of the Copper-Silicon System and ...

Two methods for refining metallurgical grade silicon to solar grade silicon have been investigated. The first method involved the reduction of impurities from metallurgical grade silicon by high …

Filtration and Purification Solutions for the Total ...

refining quartz or sand into metallurgical grade silicon, which is then purified in a series of chemical reactions. Next, during the Müller Rochow process, purified metallurgical grade silicon reacts with …

Refining and Recycling of Silicon: A Review

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.

vacuum distillation refining of metallurgical grade silicon

Vacuum distillation refining of metallurgical grade 【】：The removal of impurity phosphorus from metallurgical grade silicon is one of the major problems on purification of metallurgical grade silicon for solar grade silicon preparation.The thermodynamics on vacuum refining process of the metallurgical grade silicon was studied via separation coefficient of impurity phosphorus in the ...

Production of solar-grade silicon by refining of liquid ...

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 …

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 …

(PDF) Processes for Upgrading Metallurgical Grade Silicon ...

New metallurgical refining process of Solar Grade Silicon (SOG) feedstock reach to 7N is developed. The process consists of B reduction by oxidation, P reduction by vacuum and metal reduction by ...

(PDF) Research on the Removal of Impurities from Crude ...

The kinetics on vacuum refining process of metallurgical grade silicon was studied using maximum evaporation rate, critical pressure and mean free path of phosphorus in the metallurgical grade ...

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