production of slag for silin refining molten sog solar

Production Of Slag For Silicon Refining Molten Sog Solar

Production Of Slag For Silicon Refining Molten Sog Solar. We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment. And they are mainly used to crush coarse minerals like gold and copper ore, metals like steel and iron, glass, coal ...

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

Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon Annual Report June 10 1998 October 19, 1999 National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401-3393 NREL is a U.S. Department of Energy Laboratory Operated by Midwest Research Institute • Battelle • Bechtel Contract No. DE-AC36-99-GO10337. December 1999 •

Slag refining of silicon and silicon alloys : a review ...

To eliminate B effectively from Si for its use in a solar cell, a novel process involving the slag refining of molten Si with Sn addition was investigated. The partition ratio of B between CaO ...

Thermodynamics of solar-grade-silicon refining -

In the present paper, the purification process for the solar grade silicon SOG-Si of which the required purity is 7 N, and the thermodynamic considerations and evaluation of the refining process are discussed. Additionally, the refining process for SOG-Si production was evaluated. Finally, the low-cost overall process for producing SOG-Si was proposed.

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

While production of solar-grade silicon (SOG-Si) has been dominated recently by the modified Siemens process and a fluidized bed reactor process, obtaining a stable supply of SOG-Si at lower cost ...

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. Refining processes such as evacuation, formation of ...

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 ...

Electrochemical Slag-Metal Reaction for Silicon Production

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 must differ markedly from it in density. The ...

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

While production of solar-grade silicon (SOG-Si) has been dominated recently by the modified Siemens process and a fluidized bed reactor process, obtaining a stable supply of SOG-Si at lower cost...

Production of Solar Grade (SoG) Silicon by Refining

Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon Final Report April 19, 2001 C.P. Khattak, D.B. Joyce, and F. Schmid Crystal Systems, Inc. Salem, Massachusetts National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401-3393 NREL is a U.S. Department of Energy Laboratory Operated by Midwest Research Institute •

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 ...

Development of solar grade silicon refining via ...

Among others, silicon via a gasification-distillation method is yet the main feedstock for ordinary solar cells, but more economical production process with higher productivity has been strongly desired. 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 ...

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.

Processes for Upgrading Metallurgical Grade Silicon to ...

cells, low-cost solar-grade silicon (SoG-Si) feedstock is demanded. The most cost-effective and direct approach for producing SoG-Si is to purify and upgrade metallurgical-grade silicon. Many impurities in MG-Si can be effectively removed through directional solidification of molten silicon. However, the removal of boron (B) and phosphorus (P) by this method is difficult and expensive due to ...

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 problematic impurity elements are B and P because of their high segregation coefficients. Refining processes such as evacuation, formation of ...

Silicon processing: from quartz to crystalline silicon ...

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 metallurgical-grade silicon via the chemical means to polycrystalline silicon, or through the metallurgical route to solar-grade silicon, wafer manufacturing, and, lastly, silicon solar ...

Electrochemical Slag-Metal Reaction for Silicon Production

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 must differ markedly from it in density. The ...

Thermodynamics on SOG-Si Refining Processes

･Thermodynamics and Processing on Solar Grade Silicon (SOG-Si) Production Materials Production and Recycling Engineering Lab. (Formerly Ferrous Metallurgy Lab.) 3 Contents 1. Introduction 2. Metallurgical refining for SOG-Si - Thermodynamic properties of impurities in molten Si alloys - - Optimized Process Combined with Leaching Treatment - 3. Solidification refining of Si with Si-Al

production of slag for silicon refining molten sog solar

Production of lowcost solar grade (SoG) silicon feedstock . When the refining process is followed by directional solidifiion, 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. Get price

Production of Solar Grade (SoG) Silicon by Refining

Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon: Final Report, 19 April 2001

Processes for Upgrading Metallurgical Grade Silicon to ...

cells, low-cost solar-grade silicon (SoG-Si) feedstock is demanded. The most cost-effective and direct approach for producing SoG-Si is to purify and upgrade metallurgical-grade silicon. Many impurities in MG-Si can be effectively removed through directional solidification of molten silicon. However, the removal of boron (B) and phosphorus (P) by this method is difficult and expensive due to ...

Kinetics of Silicon Refining using Slag Treatment

Slag refining is one of the few metallurgical methods for the efficient removal of boron from silicon. In order to produce silicon for photovoltaic applications, the relationship between the slag composition and the mass transfer rate of

slag production - ddst.nl

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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. Distribution coefficients were determined for B, Ca, Mg, Fe, K and P between magnesia or alumina saturated Al 2

Utilization value of silicon slag

Silicon slag can also be used for steel slag smelting pig iron, ordinary casting, etc., silicon slag can improve furnace temperature, increase the fluidity of molten iron, high quality slag discharge, increase the number, update the toughness and cutting ability of iterative casting.In the process of stainless steel smelting by electric furnace, silicon slag is used as reducing agent to ...

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.

REMOVING BORON FROM METALLURGICAL GRADE SILICON BY

silicon (MG-Si) to SoG-Si [4-6]. It is well known that boron is an especially obstinate impurity element that is difficult to be removed from MG-Si as a result of its large sgregation coefficient (0.83) in silicon and its low volatility compared to silicon [7]. The molten slag refining is a traditional method using in the

Boron removal from molten silicon using sodium-based

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.