+86 0371 8654 9132

production of slag for silin refining molten sog solar

production of slag for silicon refining molten sog solar

Slag refining technique is a process candidate for mainly B removal in which the boron impurity in ... molten metal are removed, and it is used in many metallurgical... Get Price; Production of Solar Grade (SoG) Silicon by Refining ... - NREL . approach for producing SoG-Si is to purify and upgrade metallurgical-grade silicon. Many impurities ...

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

1999-12-13 · Production of solar grade (SoG) silicon by refining liquid metallurgical grade (MG) silicon: Annual Report: June 10 1998--October 19, 1999

Production of Solar Grade (SoG) Silicon by Refining

2013-8-22 · 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

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

2001-8-6 · Production of Solar Grade (SoG) Silicon by Refining Liquid Metallurgical Grade (MG) Silicon: Final Report, 19 April 2001

Kinetics of Silicon Refining using Slag Treatment

2016-12-5 · The slag treatment on MG-Si for SOG-Si production is based on the principle of liquid-liquid ... from molten silicon by the slag treatment, it needs to maintain high oxygen potential, which ... equilibria for oxidative refining of metallurgical silicon for solar cell

Electrochemical Slag-Metal Reaction for Silicon Production

2016-12-5 · The slag treatment on MG-Si for SOG-Si production is based on the principle of liquid-liquid ... Let us consider a liquid metal / molten slag two-phase ... Behavior and State of Boron in CaO–SiO2 Slags during Refining of Solar Grade Silicon. ISIJ international, 2009. 49(6): p. 777-782.

Boron removal for solar-grade silicon production by ...

2019-12-1 · Nowadays, slag refining, low-temperature Si-based solvent refining, gas blowing, high-temperature plasma, and acid leaching are the main processes for B removal. To effectively diminish B concentration for large-scale SOG-Si production, it is important to review the development of refining processes for B removal. 2. Properties of boron in silicon

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

2012-7-31 · It is expected that the modified Siemens process and the fluidized bed reactor process will dominate SOG-Si production in the near future. 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.

Thermodynamics of solar-grade-silicon refining -

2003-1-1 · 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 ...

(PDF) Processes for Upgrading Metallurgical Grade Silicon ...

New metallurgical refining process of Solar Grade Silicon (SOG) feedstock reach to 7N is developed. The process consists of B reduction by oxidation, P reduction by vacuum and metal reduction by ...

Kinetics of Silicon Refining using Slag Treatment

2016-12-5 · The slag treatment on MG-Si for SOG-Si production is based on the principle of liquid-liquid ... from molten silicon by the slag treatment, it needs to maintain high oxygen potential, which ... equilibria for oxidative refining of metallurgical silicon for solar cell

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

For the future, this approach, when used in an MG silicon production plant, will produce SoG silicon for $7.62/kg, which is less than the goal of $20/kg. Schematic diagram of bench scale, modified ...

Boron removal for solar-grade silicon production by ...

2019-12-1 · Nowadays, slag refining, low-temperature Si-based solvent refining, gas blowing, high-temperature plasma, and acid leaching are the main processes for B removal. To effectively diminish B concentration for large-scale SOG-Si production, it is important to review the development of refining processes for B removal. 2. Properties of boron in silicon

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

2012-7-31 · It is expected that the modified Siemens process and the fluidized bed reactor process will dominate SOG-Si production in the near future. 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.

Processes for Upgrading Metallurgical Grade Silicon to ...

2017-1-16 · developed and are currently operating industrial metallurgical processes for SoG-Si production. They apply gas blowing, slag refining, acid leaching, vacuum refining and directional solidification to produce SoG-Si [6]. In the NS Solar Material (NSSM) process in Japan, MG-Si is first refined by oxidation for B

Process for the Production of Commercial Grade Silicon ...

A basic process for the production of SoG-Si (solar grade silicon) is illustrated in FIG. 4. A more preferred process is depicted in FIG. 3. In the process in FIG. 4, a low phosphorus content CaO starting reactant is preferably employed. ... can be added to the slag refining vessel and the molten Si/Si alloy that forms in that vessel can be ...

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.

ThermochemicalAspectsofBoronandPhosphorusDistribution ...

2019-2-5 · as slag refining, plasma refining, gas refining, solvent refining, leaching, etc. [3]. In particular, the slag refining technique is a part of the only commercial metallurgical process of ELKEM Solar for SoG-Si production, where the dissolved B in silicon is adsorbed to a silicate slag through oxidation. Hence, the potential of slags for B ...

Removal of boron and phosphorus from silicon using

2014-7-8 · to solar grade silicon (SoG-Si), with the ultimate goal of reducing the production cost. Metallurgical refining route has drawn the most attention due to the low operational cost. The reduction of the impurities in silicon to a certain level has to be achieved for a high efficiency solar cell, since the impurities dictate the device performance.

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

The production of solar cells has increased rapidly in re-cent years. The availability of polycrystalline silicon, the main substrate used in photovoltaic cells, is not sufficient to satisfy this growth. The market, which currently uses off-grade electronic grade silicon (SEG-Si), requires an alter-native source of solar grade silicon (SOG-Si).

Kinetics of Silicon Refining using Slag Treatment

2016-12-5 · The slag treatment on MG-Si for SOG-Si production is based on the principle of liquid-liquid ... from molten silicon by the slag treatment, it needs to maintain high oxygen potential, which ... equilibria for oxidative refining of metallurgical silicon for solar cell

Process for the Production of Commercial Grade Silicon ...

A basic process for the production of SoG-Si (solar grade silicon) is illustrated in FIG. 4. A more preferred process is depicted in FIG. 3. In the process in FIG. 4, a low phosphorus content CaO starting reactant is preferably employed. ... can be added to the slag refining vessel and the molten Si/Si alloy that forms in that vessel can be ...

Processes for Upgrading Metallurgical Grade Silicon to ...

2017-1-16 · developed and are currently operating industrial metallurgical processes for SoG-Si production. They apply gas blowing, slag refining, acid leaching, vacuum refining and directional solidification to produce SoG-Si [6]. In the NS Solar Material (NSSM) process in Japan, MG-Si is first refined by oxidation for B

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.

Thermodynamics on SOG-Si Refining Processes

2007-8-31 · Thermodynamics on SOG-Si Refining Processes Institute of Industrial Science, ... ・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 Slag SiO 2 Crucible Molten Si-Mg Alloy Molten MgSiO 3, SiO 2 satd.MgO ...

Removal of boron and phosphorus from silicon using

2014-7-8 · to solar grade silicon (SoG-Si), with the ultimate goal of reducing the production cost. Metallurgical refining route has drawn the most attention due to the low operational cost. The reduction of the impurities in silicon to a certain level has to be achieved for a high efficiency solar cell, since the impurities dictate the device performance.

Distribution of impurity elements in slag silicon ...

2019-3-21 · 1 Distribution of Impurity Elements in Slag-Silicon Equilibria for Oxidative Refining of Metallurgical Silicon for Solar Cell Applications M.D. Johnstona* aand M. Barati aDepartment of Materials Science and Engineering, The University of Toronto, 184 College Street, Toronto, ON, Canada, M5S3E4

production process of special silicon powder for ...

the production process of solar-grade Silicon (SOG-Si) through trichlorosilane (TCS) in a program sponsored by New Energy Development Organization (NEDO). The NEDO process consists of the following two steps: (1) TCS production from by ... crusher production of slag for silicon refining molten sog solar; diagram of plant for production of ...

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

The production of solar cells has increased rapidly in re-cent years. The availability of polycrystalline silicon, the main substrate used in photovoltaic cells, is not sufficient to satisfy this growth. The market, which currently uses off-grade electronic grade silicon (SEG-Si), requires an alter-native source of solar grade silicon (SOG-Si).

硅熔体钠系造渣除硼 Boron removal from molten silicon ...

2011-10-9 · Conclusions Slag refining is an important option for boron removal from molten MG-Si in the sequential metallurgical process to produce high-purity SOG-Si. In this paper, the boron removal behavior with sodium-based slags has been investigated. (1) Boron was removed from a slag-silicon system by sodium-based slags in the form of NaBO2 or its ...