production of slag for silicon refining molten sog solar

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China Silicon Slag

China Silicon Slag Find details about China Silicon Slag Metal Silicon from Silicon Slag - Anyang Pengyu Manganese Co Ltd...

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An Evolving Method for Solar

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...

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Electrically enhanced slag

Boron removal from molten silicon using slag has been studied in this study A system of Si-B alloys reacting with CaO-SiO2-Al2O3 slag was chosen in the present study This system is important as it is relevant to metallurgical grade silicon refining process to produce solar grade silicon This study comprised of a combination of thermodynamic...

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High Purity Silicon Production System and Production Method

Jun 18 2009 0183 32 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 03...

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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...

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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 A Heat Exchanger Method HEM furnace originally designed to produce multicrystalline ingots was modified to refine molten MG silicon feedstock prior to directional solidification...

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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...

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Solar Grade Silicon Refining and Silicide Production

Solar Grade Silicon Refining and Silicide Production Processes Boron Removal Process from Molten Silicon Using Ammonia Gas The process of upgrading silicon from metallurgical grade to solar grade has great potential for reducing the price of silicon supply in the photovoltaic industry...

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Study on the Preparation of Solar Grade Silicon by

However it needs a very large initial investment using plasma equipment Slag refining is very effective method for the removal of boron from molten silicon The technical viability of the slag refining process has been demonstrated by many researches but all of them were based on laboratory scale static theoretical research...

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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...

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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...

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The removal of phosphorus and boron by slag and acid

The removal of phosphorus and boron by slag and acid leaching treatment Falin HE1 2 refining of MG-Si to Solar-grade silicon SoG-Si At present the removal method of phosphorous and boron by one and the molten silicon and slag cool at different speeds then...

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Foundry Refining Silicon Slag Ball Manufacturers China

Foundry Refining Silicon Slag Ball The silica residue is actually the residue of some materials after the smelting of the original ore These materials are called silica slag and silicon slag contains a certain amount of silicon There are many kinds of silicon slag industrial silicon slag solar silicon slag...

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Processes for Upgrading Metallurgical Grade Silicon to

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 32 Slag refining Slag refining technique is a process candidate for mainly B removal in which the boron impurity in...

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Solar Grade A Silicon Revolution Seeking Alpha

Jul 20 2008 0183 32 Most solar cell production lines today need 6N Solar Grade or SoG Dealing with molten silicon remains difficult especially the removal of...

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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...

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Development of Solar Grade SoG Silicon

Jan 18 2008 0183 32 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...

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Production of low

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...

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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...

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with Active Component Metallurgical

meet the demand of solar grade silicon Fang et al operated slag refining 3 times eliminating 9868 boron from metallur-gical silicon 22 Hence the consumption of slag will signifi-cantly drive up the cost of silicon production The estimated cost of slag is 30 to 50 in the total cost of slag refining...

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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...

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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...

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US5788945A

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...

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production of slag for silicon refining

steel slag crushing and refining plants Gold Slag Wholesale Various High Quality Gold Slag Products from Global gold supplier ferro silicium briquette silicon slag fesi briquette for steel plant ladle second refining synthetic slag sintered calcium aluminate slag factory gold supplier are mine mill 10 are crusher and 3 are other metals metal products...

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US7918916B2

The present invention relates to a calcium-silicate based slag having a phosphorus content of less than 3 ppmw The invention further relates to a method for producing low phosphorus calcium-silicate based slag where molten calcium-silicate based slag is treated with a molten ferrosilicon alloy in a vessel whereby phosphorus in the calcium-silicate based slag is transferred to the...

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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 it is recognized that the cost of production of SoG silicon using the...

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Refining Metallurgical Grade Silicon by Chlorination

A supply shortage of solar-grade silicon in recent years resulted from a rapid expansion of the solar cell industry Therefore many efforts have been done to obtain reliable metallurgical methods for production of SoG silicon from metallurgical grade silicon In this research refining of metallurgical grade silicon by chlorination treatment with...

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Electrochemical Slag

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...

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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...

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Production of solar

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...

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