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.

HPQ PUREVAP™ Commercial Plant Costing Indicates

Jul 11, 2019· HPQ’s goal, working with industry leader Apollon Solar, is also to develop a metallurgical approach to producing Solar Grade Silicon Metal (SoG Si) that will take full advantage of the PUREVAP.

Boron Removal from Silicon by CaO-Na2O-SiO2 Ternary Slag

Boron 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 In the present study, the removal of B from liquid silicon by a CaO-Na 2O-SiO 2 slag is studied.

Reaction Mechanism and Kinetics of Boron Removal from

Reaction Mechanism and Kinetics of Boron Removal from Molten Silicon by CaO-SiO 2-CaCl 2 Slag Treatment Ye Wang1 • Kazuki Morita1 Published online: 1 April 2015 The Minerals, Metals & Materials Society (TMS) 2015 Abstract The mechanism by which B is removed from Si to a molten CaO-SiO 2-CaCl 2 slag, and its subsequent.

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.

Application of slag refining technique to metallurgical

ing to the investigations, slag refining technique can remove a large amount of boron from MG-Si, and the potential industrial applications of slag refining technique were proposed Keywords: solar grade silicon, metallurgical grade silicon, slag refining, B removal.

Development of solar grade silicon refining via

Kazuki Morita abstract presented on Development of solar grade silicon refining via metallurgical route: Thermodynamic properties of silicon based alloys at Materials Research 2017

The slag refining for boron removal from metallurgical grade silicon is a promising metallurgical process for producing solar grade silicon In this paper, FeCl 2 molten salt has been used as a new refining agent to remove boron from MG-Si The effects of refining time and mass ratio of MG-Si to FeCl 2.

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.

Production of Solar Grade (SoG) Silicon by Refining Liquid

Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon: Final Report, 19 April 2001 Article (PDF Available) August 2001 with 122 Reads DOI: 102172/786367.

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.

Boron Removal from Silicon by CaO-Na2O-SiO2 Ternary Slag

Mar 12, 2015· Therefore, employing dedicated refining processes for the removal of B and P from silicon is necessary Slag refining technique can be considered as a process in which the dissolved B in molten silicon can be removed to low levels required for SoG-Si feedstock ie, below 1 ppmw, and it is applied currently in industrial scale by ELKEM AS.

Boron removal from molten silicon using sodium-based slags

Slag refining, as an important option for boron removal to produce solar grade silicon (SOG-Si) from metallurgical grade silicon (MG-Si), has attracted increasing attention In this paper, Na 2 CO 3 —SiO 2 systems were chosen as the sodium-based refining slag materials for boron removal from molten silicon.

US7879130B2

In the method of refining metallurgical grade silicon in order to produce pure silicon for solar cell production (solar grade silicon) it is known to remove boron by treatment of molten silicon with a calcium-silicate based slag Such a method is disclosed in US Pat No 5,788,945.

The mechanism of boron removal in the CaO-SiO2-Al2O3 slag

Downloadable (with restrictions)! The dissolution behavior of boron in a molten slag was evaluated at 1773 K to establish the boron removal mechanism from silicon refining for preparing higher purity solar-grade silicon From the experimental results, a mechanism of boron removal from silicon into the CaO-SiO2-Al2O3 slag system was confirmed to proceed via BO33− and B62− following a.

HPQ PUREVAP™ Commercial Plant Costing Indicates

Jul 11, 2019· HPQ’s goal, working with industry leader Apollon Solar, is also to develop a metallurgical approach to producing Solar Grade Silicon Metal (SoG Si) that will take full advantage of the PUREVAP.

Quantitative evaluation for effective removal of

Jul 01, 2011· Quantitative evaluation for effective removal of phosphorus for SoG-Si Quantitative evaluation for effective removal of phosphorus for SoG-Si Jung, Eun Jin; Moon, Byung Moon; Min, Dong Joon 2011-07-01 00:00:00 Production of solar cells has increased rapidly in recent years, and metallurgical production of solar grade silicon (SoG-Si), has increased compared with more.

Electromagnetic Levitation Refining of Iron Alloys for

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 metals.

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.

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 , The partitioning of the impurity elements between molten silicon and slag was examined in terms of basicity and oxygen potential of the slag, with particular focus on.

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.

METHOD FOR PRODUCTION OF CALCIUM ,

The present invention relates to a method for production of calcium compounds having a low boron and phosphorus content TECHNICAL BACKGROUND In refining of metallurgical grade silicon for production of solar grade silicon it is known to remove boron from molten silicon by treatment of molten silicon with calcium-silicate based slag.

How silicon is made

Silicon's compounds are also found in water, in the atmosphere, in many plants, and even in certain animals Silicon is the fourteenth element of the periodic table and is a Group IVA element, along with carbon germanium, tin and lead Pure silicon is a dark gray.