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vacuum distillation refining of metallurgical grade silicon

Vacuum Refining of Molten Silicon

Vacuum Refining of Molten Silicon JAFAR SAFARIAN and MERETE TANGSTAD Metallurgical fundamentals for vacuum refining of molten silicon and the behavior of …

US7972584B2 - Magnesiothermic methods of producing high ...

Magnesiothermic methods of producing solid silicon are provided. In a first embodiment, solid silica and magnesium gas are reacted at a temperature from 400° C. to 1000° C. to produce solid silicon and solid magnesium oxide, the silicon having a purity from 98.0 to 99.9999%. The silicon is separated from the magnesium oxide using an electrostatic technology.

EP2024284A2 - Silicon refining process - Google Patents

Nitrogen and aluminum and fluxing agents (AI2O3, SiO2, CaO and MgO) are added to molten silicon to create an oxy-nitride slag that acts as a sink for dissolved boron and phosphorus. The nitrogen can be added by bubbling nitrogen gas through the molten silicon; the aluminum can be added as aluminum metal or as AI2O3. Normally, the silicon must initially be deoxidized to …

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Vacuum Distillation Refining of Metallurgical Grade Silicon(Ⅰ) ——Thermodynamics on Removal of Phosphorus from Metallurgical Grade Silicon. Vacuum Distillation Refining of Metallurgical Grade Silicon(Ⅱ) ——Kinetics on removal of …

PV Blowback Filtration Units - Pall

The process of producing polysilicon (PS) begins with refining quartz or sand into metallurgical grade silicon, which is then purified in a series of chemical reactions. Next, during the Müller Rochow process, purified metallurgical grade silicon reacts with hydrogen chloride at elevated temperatures in the presence of a catalyst, to produce ...

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Numerical Simulation of Phosphorus Removal from …

Phosphorus can be expected to evaporate preferentially from silicon melt by induction vacuum refining (IVR). In the present study, on the assumption of phosphorus evaporating from …

Refining and Recycling of Silicon: A Review

of metallurgical grade silicon, also called silicon metal in the industry because of its appearance and not because of its physical properties, …

(PDF) Vacuum Refining of Molten Silicon

Vacuum refining under the atmospheres of 8.0×10⁻³∼3.6×10⁻² Pa was applied for removing phosphorus, aluminium and calcium in metallurgical grade silicon (MG-Si) …

Refining Silicon | PVEducation

Electronic Grade Silicon. A small amount of the metallurgical grade silicon is further refined for the semiconductor industry. Powdered MG-Si is reacted with anhydrous HCl at 300 °C in a fluidized bed reactor to form SiHCl 3. Si + 3HCl → SiHCl 3 + H 2. During this reaction impurities such as Fe, Al, and B react to form their halides (e.g ...

IL197472D0 - Process and apparatus for purifying low-grade ...

Process for the production of medium and high purity silicon from metallurgical grade silicon WO2009043167A1 (en) : : 6N Silicon Inc. Method for processing silicon powder to obtain silicon crystals JP2010052952A (ja) * : : Central Glass Co Ltd: シリコンの

Numerical simulation for parameter optimization of silicon ...

Abstract In this paper a mathematical model is developed to investigate the removal of volatile impurities in molten silicon by electron beam melting (EBM) with a high efficiency and low energy consumption. The temperature distribution of molten silicon is obtained using the commercial software FLUENT. Based on the temperature distribution, the vaporization behaviors of …

Solar-Grade Silicon from Metallurgical-Grade Silicon Via ...

Method involves: (1) initially reacting iodine and metallurgical-grade silicon to create silicon tetraiodide and impurity iodide byproducts in a cold-wall reactor chamber; (2) isolating silicon tetraiodide from the impurity iodide byproducts and purifying it by distillation in a distillation chamber; and (3) transferring the purified silicon ...

Making Cheaper Silicon for Photovoltaics: Siemens Process ...

The two most important chains of processes to purify silicon from metallurgical grade silicon (MG-Si) are the Siemens process and the Metallurgical route: The Siemens Process. The Siemens Process is the dominant process for the production of silicon for electronics and photovoltaics from MG-Si. It similar to distillation, so that silicon reacts ...

Silicon Melting - Inductotherm Corp.

Inductotherm manufactures electromagnetic cold crucible furnaces for the refining of metallurgical grade silicon and the casting of multicrystalline silicon ingots. Our innovative process utilizes a segmented water-cooled copper crucible for refractory-free induction melting. We are always improving, developing, and refining EMCC Technology to ...

The 18th International Vacuum Conference (IVC-18)

Vacuum distillation as an effective purification method has been used in the preparation of high-purity bismuth [14] and the refining of the metallurgical grade silicon [15,16], etc. But the purification of crude nickel by vacuum distillation has not been reported. In this paper the purification of crude nickel by vacuum distillation was studied.

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Vacuum Distillation Refining Of Metallurgical Grade Silicon; Disc Pulveriser Grinding; Por le Vacuum Grinder; Disc Grinding Enterprise; grinding disc o ide; Vacuum Filter Grumman Aa 5; double disc grinding of ferrous amp non; crusher a 2254 me wet and dry vacuum price; Grinding Disc 6mm; Grinding Disc Buyers; sand vacuum grinding

Kinetics and Mechanism of Phosphorus Removal from Silicon ...

Abstract Vacuum induction refining is a process that can be applied to remove phosphorus from molten silicon for the production of solar grade silicon. Pure silicon was doped by phosphorus to make molten silicon containing around 17 ppmw phosphorus. The kinetics of phosphorus removal from this silicon was studied at 0.5 Pa through the application …

Refining Silicon | PVEducation

The impurity levels in metallurgical grade silicon5 vary widely due to process variation and the source raw materials of silica and carbon. Electronic Grade Silicon. A small amount of the metallurgical grade silicon is further refined for the semiconductor industry. Powdered MG-Si is reacted with anhydrous HCl at 300 °C in a fluidized bed ...

Effects of Slag Refining and Vacuum Treatment on De ...

This paper presents a detailed analysis of the effect of slag refining and vacuum treatment on P removal from metallurgical-grade silicon using CaO-SiO2-CaCl2 slag. It demonstrates that both of CaO: SiO2 ratio and CaCl2 content have significant effects on the P removal. Increasing CaO: SiO2 ratio was found to decrease the P removal efficiency after slag refining and …

Purification of Indium by Vacuum Distillation | SpringerLink

Vacuum distillation refining of metallurgical Grade silicon(II)-Kinetics on removal of phosphorus from metallurgical grade silicon. Transactions of Nonferrous Metals Society of China. 17(A02) (2007),1026–1029 Google Scholar

(PDF) Vacuum Refining of Molten Silicon

vacuum refining is recently used for silicon purification to remove phosphorus and is a candidate process in sog-si production, 2, 3,15,16 and it is scaled up in pilot production. 17 …

Characterization of the Copper-Silicon System and ...

Two methods for refining metallurgical grade silicon to solar grade silicon have been investigated. The first method involved the reduction of impurities from metallurgical grade silicon by high temperature vacuum refining. The concentrations of analyzed elements were reduced several times. The main steps in the second refining method include alloying with …

Sustainable extraction of lead and re-use of valuable ...

Vacuum distillation results (Table 2, Table 3) revealed that HTVD and LTVD provided an effective and clean method to extract lead from crude lead whilst recycling valuable metals, which can replace the heavily polluted, complex procedure, of traditional pyro-metallurgical processes .

Phosphorus removal from upgraded metallurgical-grade ...

Vacuum refining is considered relatively effective for removing phosphorus from molten silicon. Based on the saturated vapor pressure of phosphorus calculated, the removal …

US4092446A - Process of refining impure silicon to produce ...

A balanced closed cycle silicon refinery has been developed for producing electronic silicon from industrial grade silicon. Impurities comprising approximately 1% of the industrial grade silicon are removed during the refinery process to produce the purified silicon, while only a relatively small percentage of make-up chemicals are added to the system.

Application of Electron Beam Melting to the Removal of ...

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. Because P evaporates preferentially …

Study on Al Removal from MG-Si by Vacuum Refining ...

Phosphorus removal from metallurgical grade silicon by CaO-SiO2-CaCl2 slag treatment, HCl leaching, and vacuum refining was investigated. The effect of different compositions of …

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Vacuum Refining of Molten Silicon - Metallurgical and ...

12%Vacuum refining can be an alternative process step for silicon refining in the metallurgical route to remove particular impurities, which are more volatile …

Semiconductor Grade Silicon

n n nnnnnn Metallurgical-grade silicon (MGS) n . The typical source material for commercial production of elemental silicon is quartzite gravel; a relatively pure form of sand (SiO 2).The first step in the synthesis of silicon is the melting and reduction of the silica in a submerged-electrode arc furnace.

Deeply removing lead from Pb-Sn alloy with vacuum distillation

Vacuum distillation refining of metallurgical grade silicon (I) ---Thermodynamics on removal of phosphorus from metallurgical grade silicon , , , , ,