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

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 ...

Removal of Boron from Molten Silicon using Na2O …

To enable metallurgical refining to become the major production route for SOG-Si, process innovations such as an extremely low-temperature purification process or direct wafering from molten silicon with high productivity may be indispensable. One possible advance in the metallurgical process may lie in low-temperature solvent refining using …

The Kinetics of Boron Removal during Slag Refining in …

2 Recent Research Fields ・Physical Chemistry of High Temperature Processing (Steelmaking and Waste Management) ・Microwave Processing for Recycling and Waste Treatment ・Thermodynamics and Processing on Solar Grade Silicon (SOG-Si) Production Materials Production and Recycling

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

metallurgical methods for production of SoG silicon from metallurgical grade silicon. In this research, refining of metallurgical grade silicon by chlorination treatment with the emphasis on Al removal was investigated. Thermodynamic calculations through

REMOVING BORON FROM METALLURGICAL …

Slag is usually a mixture of metal oxides and silicon dioxide. ... these impurities are separated from the molten metal and can be removed. Slag is the collection of ...

The relationship between silicate structure and mass ...

this, a global shortage in the solar-grade silicon (SoG-Si) used in the production of solar cells has motivated numerous studies on metallurgical-grade Si (MG-Si) refining. How- ... Study of boron removal from molten silicon by slag refining under atmosphere ...

Production of Solar Grade (SoG) Silicon by Refining …

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 ...

Development Of Solar Grade Silicon Refining Via ...

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.

Slag - Wikipedia

... CaO and MgO) are added to molten silicon to create an oxy-nitride slag that ... phosphorus refining ... and produce silicon suitable for use in solar ...

slag production equipment price - macimpianti.eu

PDF Version Also Available for Download. Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of ...

Solar Grade Silicon by a Direct Metallurgical Process

Charge sizes have been scaled up to 60 kg.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 ...

Effects of Slag Refining on Boron Removal from ...

Request PDF on ResearchGate | Study of boron removal from molten silicon by slag refining under atmosphere | Solar energy is expected to be in great demand within the next few years. In relation to this, a global shortage in the solar-grade silicon (SoG-Si) used in the production of solar cells has motivated numerous studies on metallurgical-grade Si (MG-Si) refining.

Electrochemical refining of silicon in molten salts - …

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.

Development of Solar Grade (SoG) Silicon - Digital Library

Solar energy is expected to be in great demand within the next few years. In relation to this, a global shortage in the solar-grade silicon (SoG-Si) used in the production of solar cells has motivated numerous studies on metallurgical-grade Si (MG-Si) refining.

Refining Metallurgical Grade Silicon by …

Thus, a multistep route is needed to achieve SoG-Si (Johnston and Barati 2010 Johnston, M., and Barati, M., 2010, " Distribution of impurity elements in slag–silicon equilibria for oxidative refining of metallurgical silicon for solar cell applications."

Thermodynamics on SOG-Si Refining Processes

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 ...

Solar Grade Silicon | Silicon | Photovoltaics

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-SiO 2-24 mol pct CaF 2 slag and Si-Sn alloy at 1673 K (1400 °C) was determined by the chemical ...


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