production of slag for silicon refining molten sog solar

Production of solar grade (SoG) silicon by refining liquid ...

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.

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.

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 ...

Thermodynamics on SOG-Si Refining Processes

Thermodynamics on SOG-Si Refining Processes Institute of Industrial Science, ... and Waste Management) ・Microwave Processing for Recycling and Waste Treatment ・Thermodynamics and Processing on Solar Grade Silicon (SOG-Si) Production ... Molten SiO 2 satd. CaO-SiO 2 Slag SiO 2 Crucible Molten Si-Mg Alloy Molten MgSiO 3, SiO 2 satd.MgO-SiO 2 ...

US Patent for High purity silicon production system and ...

Jul 20, 2006· The present invention provides a high purity silicon production system and production method suitable for using inexpensive metallurgical grade metal silicon as a material and using the slag refining method to produce high purity silicon with a purity of 6N or more suitable for solar battery applications, in particular, high purity silicon with a boron content of at least not more than 0.3 ...

REMOVING BORON FROM METALLURGICAL GRADE …

volatility compared to silicon [7]. The molten slag refining is a traditional method using in the purification of steel making [8]and it was also proved that the molten slag refining based on calcium sillicate system is an efficient agent of removing boron from molten metallurgical grade silicon …

Silicon processing: from quartz to crystalline silicon ...

The value chain for the production of crystalline silicon solar cells has been reviewed. The primary processing steps for the production of silicon solar cells from quartz are as follows: bulk production of metallurgical-grade silicon via carbothermic reduction in a submerged furnace, refining of …

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.

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

Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon ABSTRACT The photovoltaic (PV) industry is undergoing rapid growth with the production of modules having approached 300 MW in 2000.

Refining and Recycling of Silicon: A Review - USP

recycling and refining of silicon for photovoltaics (PV). 1 SILICON . Silicon (Si) is the second member in the Group IVA in the periodic system of elements. It never occurs free in nature, but in combination with oxygen forming oxides and silicates. Most of the Earth’s crust is made up of silica and miscellaneous silicates associated with

Production of solar grade (SoG) silicon by refining liquid ...

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.

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.

production of slag for silicon refining molten sog solar

production of slag for 2bsilicon refining molten sog solar Mobile Jaw Crusher PEW Jaw Crusher Raymond Mill Poject 150-200TPH Cobble Crushing Plant Andesite Crushing Plant In I development of solar grade (sog) silicon (85

US5788945A - Method for refining of silicon - Google Patents

9. In a slag refining process for removing impurities from molten silicon in a vessel with a slag having the capability of removing impurities from said molten silicon, the improvement wherein the slag has a density less than silicon, and said slag is supplied to the molten silicon bath through the bottom or through the lower part of the wall of the vessel containing the molten silicon, and ...

The relationship between silicate structure and mass ...

Slag 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.

Development of Solar Grade (SoG) Silicon - Digital Library

Jan 18, 2008· The rapid growth of the photovoltaics (PV) industry is threatened by the ongoing shortage of suitable solar grade (SoG) silicon. Until 2004, the PV industry relied on the off spec polysilicon from the electronics industry for feedstock. The rapid growth of PV meant that the demand for SoG silicon predictably surpassed this supply. The long-term prospects for PV are very bright as costs have ...

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.

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

Currently, feedstock supplies are scraps and surplus from the microelectronics industry. 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.

Evaporation Behavior of Phosphorus from ... - SpringerLink

The calcium concentration in slag-treated silicon increased with increasing CaO/SiO 2 mass ratio of slag, decreasing the evaporation efficiency of phosphorus in molten silicon. The total phosphorus removal efficiency changed from 93.0% to 98.3% when the slag-treated silicon was treated with HCl before vacuum refining.

BORON REMOVAL FROM METALLURGICAL GRADE …

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

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 the behaviour of boron and ...

Vacuum Distillation Refining Of Metallurgical Grade Silicon

Sales Inquiry Vacuum Distillation Refining Of Metallurgical Grade Silicon; Production of Solar Grade (SoG) Silicon by Refining . 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.

Production of low-cost solar grade (SoG) silicon feedstock ...

May 24, 2002· When the refining process is followed by directional solidification, it can be used for upgrading metallurgical grade (MG) silicon to produce solar grade (SoG) silicon. For the long term, total processing in an MG silicon production plant can result in $10/kg SoG silicon feedstock.

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

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.

The Kinetics of Boron Removal during Slag Refining in the ...

EPD Congress 2012 TMS (The Minerals, Metals & Materials Society), 2012 THE KINETICS OF BORON REMOVAL DURING SLAG REFINING IN THE PRODUCTION OF SOLAR-GRADE SILICON E. Krystad1, S. Zhang1, G. Tranell1 1 Dept. of Materials Science and Engineering, NTNU, N-7491 Trondheim, Norway Keywords: Boron, Slag refining, Mass transfer coefficient ABSTRACT The kinetics of boron removal from liquid silicon ...

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

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.

An Evolving Method for Solar-Grade Silicon Production ...

In order to develop a low-cost metallurgical route for solar grade silicon (SOG-Si) production, a novel process sequence of slag treatment and solidification refining using Si-Sn solvents under ...

Electrochemical Slag-Metal Reaction for Silicon Production

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 ...

production of slag for silicon refining molten sog solar

»production of slag for silicon refining -molten -sog -solar Silicon Production.carbon, and halogens are required for existing technologies of . dremel 84922 silicon carbide grinding stone. equipment for producing silicon from sand flow diagram of dal mill production of slag for silicon refining -molten -sog -solar dal mill project nabard

Preparation of Solar Grade Silicon ... - SpringerLink

Abstract. Al-Si alloy, a precursor of solar grade silicon, was prepared by direct electrolysis in cryolite molten salt at 950 °C using high purity silica as material, liquid aluminum as the cathode and high purity graphite as the anode.

Distribution of impurity elements in slag–silicon ...

The possibility of refining metallurgical grade silicon to a high-purity product for solar cell applications by the slagging of impurity elements was investigated.

Solar Grade: A Silicon Revolution | Seeking Alpha

Jul 20, 2008· Most solar cell production lines today need 6N: Solar Grade or SoG. ... Dealing with molten silicon remains difficult, especially the removal of …