+86 0371 8654 9132

production of slag for silicon refining molten sog solar

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

2013-8-9  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.

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

2013-8-22  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. At the projected 25% annual growth rate worldwide

Read More
Processes for Upgrading Metallurgical Grade Silicon to ...

2012-1-1  With regard to the uniqueness of directional solidification on removal a wide range of impurities from silicon, it is expected that this process will continue to be a part of the best developed process for SoG-Si production. 3.2. Slag refining Slag refining technique is a process candidate for mainly B removal in which the boron impurity in molten silicon is oxidized and removed by a molten silicate slag.

Read More
Production of Solar Grade (SoG) Silicon by Refining

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. A Heat Exchanger Method (HEM) furnace originally designed to produce multicrystalline ingots was modified to refine molten MG silicon feedstock prior to directional solidification. Based on theoretical calculations, simple ...

Read More
A Review of Slag Refining of Crude Silicon SpringerLink

2020-11-23  Metallurgical refining of crude silicon for low-cost, mass production of solar silicon has been studied extensively over the past two decades. One of the methods attempted to target the deleterious impurities of Si is slag refining, where liquid Si or its alloys are treated with a flux.

Read More
Thermodynamics of solar-grade-silicon refining -

2003-1-1  The energy consumption for producing silicon should be less than the energy generated by the solar cell. The abundance ratio of silicon is larger than any other element except oxygen, and this silicon can be found anywhere. However, producing this common element in a metallic form is not easy.

Read More
Development of Solar Grade (SoG) Silicon

2020-1-27  A schematic of a process for upgrading MG silicon to SoG silicon is shown in Figure 1 where molten silicon from a submerged direct arc reduction furnace is poured into a refining furnace. The refining furnace will use a combination of gas blowing and slagging, and vacuum. After refining

Read More
Silicon Production by Molten Salt Electrolysis

2014-9-25  The world production of MG-Si, excluding ferrosilicon, was ca. 1.5 million metric ton in 2011 . SOG-Si is mainly produced from MG-Si by Siemens process which involves the combined reaction of hydrogen reduction and thermal decomposition of SiHCl 3. The world production of SOG-Si was estimated to be approximately 0.15 million metric ton in 2011.

Read More
The relationship between silicate structure and mass ...

2014-7-8  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.

Read More
Removal of Boron from Molten Silicon Using CaO–SiO

2009-6-16  The global shortage of solar grade silicon for the production of photovoltaic cells has motivated many researches on the refining of silicon, especially the refining of metallurgical-grade silicon. In order to obtain better control of the removal process of boron from molten silicon using silicate slags, precise thermodynamic data are required.

Read More
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. The most

Read More
Production of Solar Grade (SoG) Silicon by Refining

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. A Heat Exchanger Method (HEM) furnace originally designed to produce multicrystalline ingots was modified to refine molten MG silicon feedstock prior to directional solidification. Based on theoretical calculations, simple ...

Read More
Electrochemical Slag-Metal Reaction for Silicon Production

2016-12-5  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 slag must be low, and the slag must be nonreactive with molten silicon and ...

Read More
Production of Solar Grade (SoG) Silicon by Refining

2001-8-6  @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.

Read More
Development of Solar Grade (SoG) Silicon

2020-1-27  Molten MG Silicon Upgraded MG Silicon Carbon Silica Figure 1. Schematic diagram of SoG silicon production by upgrading MG silicon. The process begins with selected raw materials to make the MG silicon in the Direct Arc Reduction (DAR) furnace. This molten or directionally solidified material is further refined in the refining furnace

Read More
Silicon Production by Molten Salt Electrolysis

2014-9-25  The world production of SOG-Si was estimated to be approximately 0.15 million metric ton in 2011. SEG-Si is also produced chiefly by Siemens process, and its world production was estimated to be about 0.03 million metric ton in 2011. Until now, silicon has not been practically produced by molten

Read More
THERMODYNAMIC PROPERTIES AND STRUCTURAL

2015-9-7  actual feed stock of this material for the solar cell market. Metallurgical grade silicon can be used for the production of solar cells if the required degree of purity is achieved. The slag refining of silicon for boron removal using silicate slags is one of the available techniques. In this work, the thermodynamics of CaO-SiO 2 and CaO-SiO 2 ...

Read More
Development of Solar Grade Silicon (SoG-Si)

2013-1-24  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.

Read More
Silicon processing: from quartz to crystalline silicon ...

2011-3-15  The flowsheets for the production of silicon solar cells from quartz via both the ... by slag treatment or gas purging. During refining, inclusions are removed, and ... Subsequent to refining, the molten alloy is allowed to cool in a mould, and then crushed to a specific size. Metallurgical-grade silicon has a typical specification of 98.5–99 ...

Read More
Removal of Boron from Molten Silicon Using CaO–SiO

2009-6-16  The global shortage of solar grade silicon for the production of photovoltaic cells has motivated many researches on the refining of silicon, especially the refining of metallurgical-grade silicon. In order to obtain better control of the removal process of boron from molten silicon using silicate slags, precise thermodynamic data are required.

Read More
Production of Solar Grade (SoG) Silicon by Refining

2001-8-6  @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.

Read More
Production of Solar Grade (SoG) Silicon by Refining

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. A Heat Exchanger Method (HEM) furnace originally designed to produce multicrystalline ingots was modified to refine molten MG silicon feedstock prior to directional solidification. Based on theoretical calculations, simple ...

Read More
Production of solar grade (SoG) silicon by refining

1999-12-13  @article{osti_753817, title = {Production of solar grade (SoG) silicon by refining liquid metallurgical grade (MG) silicon: Annual Report: June 10 1998--October 19, 1999}, author = {Khattak, C P and Joyce, D B and Schmid, F}, abstractNote = {Pyro-metallurgical refining techniques are being developed for use with molten metallurgical-grade (MG) silicon so that directionally solidified refined ...

Read More
Development of Solar Grade (SoG) Silicon (Technical

2008-1-18  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.

Read More
Development of Solar Grade (SoG) Silicon

2020-1-27  Molten MG Silicon Upgraded MG Silicon Carbon Silica Figure 1. Schematic diagram of SoG silicon production by upgrading MG silicon. The process begins with selected raw materials to make the MG silicon in the Direct Arc Reduction (DAR) furnace. This molten or directionally solidified material is further refined in the refining furnace

Read More
Production of low-cost solar grade (SoG) silicon

2002-5-24  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.

Read More
THERMODYNAMIC PROPERTIES AND STRUCTURAL

2015-9-7  actual feed stock of this material for the solar cell market. Metallurgical grade silicon can be used for the production of solar cells if the required degree of purity is achieved. The slag refining of silicon for boron removal using silicate slags is one of the available techniques. In this work, the thermodynamics of CaO-SiO 2 and CaO-SiO 2 ...

Read More
Silicon processing: from quartz to crystalline silicon ...

2011-3-15  The flowsheets for the production of silicon solar cells from quartz via both the ... by slag treatment or gas purging. During refining, inclusions are removed, and ... Subsequent to refining, the molten alloy is allowed to cool in a mould, and then crushed to a specific size. Metallurgical-grade silicon has a typical specification of 98.5–99 ...

Read More
The relationship between silicate structure and mass ...

2014-7-8  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.

Read More
Removal of Boron from Molten Silicon Using CaO–SiO

2009-6-16  The global shortage of solar grade silicon for the production of photovoltaic cells has motivated many researches on the refining of silicon, especially the refining of metallurgical-grade silicon. In order to obtain better control of the removal process of boron from molten silicon using silicate slags, precise thermodynamic data are required.

Read More