production of slag for silicon refining molten sog solar

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Processes for Upgrading Metallurgical Grade Silicon to ,
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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CN101555013A - Refining method of industrial silicon ,
CN101555013A - Refining method of industrial silicon ,

The invention relates to a refining method of industrial silicon, in particular to a refining method of industrial silicon used for preparing solar battery silicon materials Industrial silicon water flowing out from a submerged arc furnace is poured into a silicon water container in a 'tower type' refining furnace containing liquated and specially prepared slag; inert gases, purified gases ....

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Development of Solar Grade (SoG) Silicon - Digital Library
Development of Solar Grade (SoG) Silicon - Digital Library

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

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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BORON REMOVAL FROM METALLURGICAL GRADE ,
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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Slag - Wikipedia
Slag - Wikipedia

Slag from steel mills in ferrous smelting, on the other hand, is designed to minimize iron loss and so mainly contains oxides of calcium, silicon, magnesium, and aluminium Any sandy component or quartz component of the original ore automatically carries through the smelting process as silicon dioxide...

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slag conveyor fluid coupling
slag conveyor fluid coupling

Construction, Working, Operation and Maintenance of Fluid , 3 Construction, Working, Operation and Maintenance of Fluid Couplings Pull-up Torque The pull-up torque of a motor is the minimum torque developed by the motor when accelerating from rest to the breakdown torque point...

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REMOVING BORON FROM METALLURGICAL GRADE ,
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 ,...

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Solar Silicon Processes
Solar Silicon Processes

Figure 310 Schematic diagram of a bench-scale DS reactor allowing gas bubbling (After C P Khattak, D B Joyce, and F Schmid, 2001 Production of solar grade (SoG) silicon by refining liquid metallurgical grade (MG) silicon, Final Report NREL/SR-520-30716, Crystal Systems, Inc, April 19...

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Electromagnetic Levitation Refining of Iron Alloys for ,
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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Distribution of impurity elements in slag silicon ,
Distribution of impurity elements in slag silicon ,

1 Distribution of Impurity Elements in Slag-Silicon Equilibria for Oxidative Refining of Metallurgical Silicon for Solar Cell Applications MD Johnstona* aand M Barati aDepartment of Materials Science and Engineering, The University of Toronto, 184 College Street, Toronto, ON, Canada, M5S3E4...

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Solar Grade: A Silicon Revolution | Seeking Alpha
Solar Grade: A Silicon Revolution | Seeking Alpha

Jul 20, 2008· Solar Grade: A Silicon Revolution , Most solar cell production lines today need 6N: Solar Grade or SoG , Dealing with molten silicon remains ,...

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Recent Patenting Activities in Low-Cost Silicon Raw ,
Recent Patenting Activities in Low-Cost Silicon Raw ,

Title: Recent Patenting Activities in Low-Cost Silicon Raw Materials for Silicon Solar Cells VOLUME: 4 ISSUE: 1 Author(s):Xin Gu, Deren Yang, Tingting Jiang, Xuegong Yu and Duanlin Que Affiliation:State Key Lab of Silicon Materials, Zhejiang University, 310027 Hangzhou, P R China Keywords:Low-cost silicon, refining, impurity, chemical route, metallurgical route, solar cell, ,...

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Boron removal in purifying metallurgical grade silicon by ,
Boron removal in purifying metallurgical grade silicon by ,

Fig 1 Schematic diagram of apparatus for molten slag refining Boron removal using the pure SiO2 and CaO−SiO2 binary slag refining was carried out under different conditions of slag composition, mass ratios of slag to silicon and refining time, respectively The boron contents in the refined slag and silicon samples were...

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Refining Metallurgical Grade Silicon by Chlorination ,
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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Slag refining of silicon and silicon alloys : a review ,
Slag refining of silicon and silicon alloys : a review ,

In order to optimize the B removal during slag-refining process for solar-grade silicon production, a new process for the removal of B in molten Si was proposed based on the principle of oxidized ....

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The Distribution of Boron between SiO2 CaO MgO Slags and ,
The Distribution of Boron between SiO2 CaO MgO Slags and ,

In the refining of solar-grade silicon using slag treatment, boron dissolved in the silicon is rejected to a liquid oxide (slag) phase In this study the partitioning of boron between 2 –CaO–MgO slags and liquid silicon was SiO examined at 1873 K over a range of slag compositions and gas compositions It was found that the distribution ....

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(PDF) Production of High Silicon Alloys | Halvard Tveit ,
(PDF) Production of High Silicon Alloys | Halvard Tveit ,

In this book, the term high silicon alloys includes all the silicon-containing alloys where the silicon dominates the behaviour in the furnace We also include alloys that can be produced by metallurgical refining of high silicon alloys from the arc furnace Such metallurgical refining may be done by slag treatment, gas purging or crystallization...

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Slag - Wikipedia
Slag - Wikipedia

Molten slag is carried outside and poured to a dump Slag is the glass-like by-product left over after a desired metal has been separated (ie, smelted) from its raw ore Slag is usually a mixture of metal oxides and silicon dioxide However, slags can contain metal sulfides and elemental metals...

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Exploration of boron removal from molten silicon by ,
Exploration of boron removal from molten silicon by ,

ABSTRACTAmmonia gas blowing has been successfully applied to the silicon refining process for boron removal Molten iron catalyst could effectively promote the boron removal ratio in the progress It inspired the attempt of combining ammonia blowing with other refining treatments Oxygen resources were introduced into the process in order to further decrease the boron content in silicon...

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Recovery and purification of metallic silicon from waste ,
Recovery and purification of metallic silicon from waste ,

Aug 20, 2019· Industrial silicon slag by a metallic silicon plant in Yunnan of China was provided as the raw materials of this study The chemical composition of waste silicon slag after secondary refining is listed in Table 1It is seen that the silicon slag primarily consists of ,...

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METHOD FOR MAKING SILICON FEEDSTOCK FOR SOLAR CELLS ,
METHOD FOR MAKING SILICON FEEDSTOCK FOR SOLAR CELLS ,

Jan 01, 2014· It has been found that the silicon feedstock produced according to this method is well suited for the production of directionally solidified ingots, thin sheets and ribbons for the production of wafers for solar cells having an efficiency comparable to commercial solar cells The silicon feedstock of the present invention is used for producing ....

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Development Of Solar Grade Silicon Refining Via ,
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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Production of solar-grade silicon by refining of liquid ,
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...

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

Oct 04, 2019· 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...

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(PDF) Production of solar-grade silicon by refining of ,
(PDF) Production of solar-grade silicon by refining of ,

Production of solar-grade silicon by refining of liquid metallurgical-grade silicon , Production of Solar Grade (SoG) Silicon by , to react with molten MG silicon and promote refining [28 ....

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Evaporation Removal of Boron in Molten Silicon Using ,
Evaporation Removal of Boron in Molten Silicon Using ,

Abstract In order to optimize the B removal during slag-refining process for solar-grade silicon production, a new process for the removal of B in molten Si was proposed based on the principle of oxidized chlorination and evaporation...

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Kazuki Morita - Google Scholar Citations
Kazuki Morita - Google Scholar Citations

Thermodynamic evaluation of new metallurgical refining processes for SOG-silicon production , 2011: An evolving method for solar-grade silicon production: solvent refining T Yoshikawa, K Morita Jom 64 (8), 946-951, 2012 64: 2012: Thermodynamic property of B in molten Si and phase relations in the Si–Al–B system , magnesium, and ....

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Foundry Refining Silicon Slag Ball Manufacturers China ,
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, semiconductor....

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EP2534100A1 - Method for recovering solar grade silicon ,
EP2534100A1 - Method for recovering solar grade silicon ,

The invention concerns a method of refining and converting particulate silicon to silicon lumps, where the method comprises mixing the particulate silicon with at least one slag forming compound in a weight ratio, particulate silicon:slag forming compound(s), from 1:10 to 3:1 in a crucible, wherein the at least one slag forming compound will form a liquid the slag at the operating temperature ....

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