production of slag for silicon refining molten sog solar

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Quantitative evaluation for effective removal of ...

The effective removal of phosphorus for SoG-Si using several refining processes was evaluated quantitatively. AB - Production of solar cells has increased rapidly in recent years, and metallurgical production of solar grade silicon (SoG-Si), has increased compared with more expensive processes such as Siemens process and Cz processes.

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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

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Solar Silicon Processes

3.1 Introduction. Studies and developments of processes which could be used to convert metallurgical grade (MG)-silicon or any kind of impure silicon in a solar grade (SoG) feedstock started early in the 1980s in the United States, Europe, and Japan with almost common objectives and strategies [].The main aim was to demonstrate that physical, chemical, and metallurgical treatments of MG-Si in ...

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26th European Photovoltaic Solar energy conference and ...

feedstock production is required. Regarding the initial silicon production in electric furnace, the most economic way for silicon purification may be its processing in the liquid state. Vacuum refining of molten silicon is a process that can be applied to remove volatile elements from liquid silicon.

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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.

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China Silicon Slag - China Silicon Slag, Metal Silicon

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

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Vacuum Refining of Molten Silicon

Direc- silicon scrap from electronic industry led the photovol- tional solidification, which is always a key process step in taic industry to focus its efforts on the development of SoG-Si production through metallurgical route, is a new production processes dedicated to solar silicon.[2] purification method to remove all impurities ...

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US7682585B2 - Silicon refining process - Google Patents

Refining Using Solid Discard Phase As an alternative to forming a slag, boron and/or phosphorus may be removed from the silicon by passing the molten silicon though a bed of solids containing a nitrogen-containing compound and/or an aluminum-containing compound.

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RECYCLING OF SOLAR SILICON WASTE BY PARTICLE …

silicon (MC-Si), or amorphous silicon [1] for over 90 % of its market share [2]. MC-Si is produced by directional solidification of molten solar grade silicon (SoG-Si) and dominates the silicon PV market. During the directional solidification process, SiC and Si 3 N 4 particles within the melt

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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 ...

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

 · The growth of the photovoltaic industry will be limited by the availability of silicon feedstock. 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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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.

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The Kinetics of Boron Transfer in Slag Refining of Silicon

Recent years have seen a race in industry and In the slag refining process, removal of boron from research aimed at obtaining reliable metallurgical the metal occurs by oxidation at the metal–slag routes for production of silicon for solar cells (SoG- interface.

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tasiast project - comenius-ag.de

Tasiast South Project Drake Resources. Overview. Drake is the first company to explore this area for gold. This exciting project covers two highly prospective targets for a total 187 square kilometres and includes the southern extensions of the Tasiast Greenstone Belt, host to the 20 million ounce Tasiast gold mine, and also the southern part of the Tijirit Greenstone Belt, which also hosts ...

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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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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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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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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.

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US4242175A - Silicon refining process - Google Patents

A silicon refining process according to claim 1, wherein the reaction chamber is heated differentially as the molten silicon metal is flowed downwardly therethrough, heating of the upper part of said chamber being such as to maintain the temperature therein only slightly above the melting temperature of said metal, and heating of the lower part ...

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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.

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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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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.

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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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of slag for silicon refiningmoltensogsolar

Silicon Metal The Quartz Corp | High Purity Quartz. Silicon metal processing often involves slag refining, which is made possible using high purity quartz. For more information on slag refining and silicon metal production can be found here. To create silicon metal that is good enough for solar silicon, the silicon must be very clean, 99.9999% .

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Application of slag refining technique to metallurgical ...

ing to the investigations, slag refining technique can remove a large amount of boron from MG-Si, and the potential industrial applications of slag refining technique were proposed. Keywords: solar grade silicon, metallurgical grade silicon, slag refining, B removal.

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Production of silicon feedstock - Free Patents Online

 · The silicon feedstock of the present invention is used for producing directionally solidified Czochralski, float zone or multicrystalline silicon ingots, thin sheets and ribbons for the production of silicon wafers for PV solar cells, characterised in that the silicon feedstock contains between 0.3 and 5.0 ppma boron, between 0.5 and 3.5 ppma ...

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Behavior and State of Boron in CaO–SiO2 Slags during ...

The thermodynamics of boron removal during the refining of solar grade silicon by slag treatment was in-vestigated using CaO–SiO 2 slags. The partition ratio of boron between slag and silicon phases and the state of boron in slag were investigated for a composition range of …

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Solar Grade: A Silicon Revolution | Seeking Alpha

 · 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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Thermodynamics of solar-grade-silicon refining - ScienceDirect

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.

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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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