Removal of Phosphorus from Si-Fe Alloy by CaO-Al2O3-SiO2-Na2O Slag Refining

Taposhe, Golam Ismot Ara; Khajavi, Leili Tafaghodi

doi:10.1007/s11837-020-04496-8

Cited by 7 publications

(4 citation statements)

References 46 publications

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“…The optimum composition for maximum removal of B and P from the Si-Fe alloy was determined by the authors and has been reported in previous publications [22,23]. The optimum impurity removal at 1300 • C was achieved at CaO/SiO 2 of 1.5, SiO 2 /Al 2 O 3 of 2, and 10 wt% Na 2 O for the quaternary slag.…”

Section: Slag Preparationmentioning

confidence: 64%

“…Understanding the thermodynamics and kinetics of B and P distribution between the slag and alloy phases is crucial for process control. A significant number of investigations were carried out on the thermodynamic analysis of Si refining [18,19,[22][23][24][25][26][27][28]. However, kinetic analysis on the mass transfer of B and P between the alloy and slag phases is very limited.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Analysis of Boron and Phosphorus Removal from Si-Fe Alloy by CaO-Al2O3-SiO2-Na2O Slag

Taposhe

Khajavi

2023

Processes

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A hybrid process of slag and solvent refining was used to remove boron and phosphorus from silicon. Quaternary slag of CaO-Al2O3-SiO2-Na2O was employed to remove boron (B) and phosphorus (P) from Si-20 wt% Fe alloy at 1300 °C. A slag-to-metal ratio of one was used at different reaction times. The mass transfer coefficient of B and P in the slag and alloy phases was calculated to determine the rate-limiting step. The mass transfer coefficients of B in the alloy and slag phases were 6.6 × 10−7 ms−1 and 2.8 × 10−7 ms−1, respectively. The mass transfer coefficients of P in the alloy and slag phases were determined to be 7.5 × 10−8 ms−1 and 3.5 × 10−7 ms−1, respectively. The rate-limiting stage of the slag–alloy reaction kinetics was mass transport in the liquid slag for B and mass transport in the alloy phase for P.

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Section: Slag Preparationmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Kinetic Analysis of Boron and Phosphorus Removal from Si-Fe Alloy by CaO-Al2O3-SiO2-Na2O Slag

Taposhe

Khajavi

2023

Processes

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“…Due to the presence of a large amount of Na 2 O-bearing slag during the sodium smelting of VTM, it has a very good effect on the removal of impurities [28][29][30]. If lowtitanium-content molten iron can be obtained by adjusting the process parameters, it will greatly broaden its use and enhance its value.…”

Section: Introductionmentioning

confidence: 99%

Titanium Impurity Control in V-Bearing Pig Iron Prepared via the Sodium Smelting of Vanadium–Titanium Magnetite

Bian,

Cao,

Chen

et al. 2023

Metals

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The sodium smelting of vanadium–titanium magnetite (VTM) can realize a multi-component comprehensive utilization of VTM. To broaden the application of the vanadium-bearing pig iron produced through this process, it is imperative to maintain the titanium content in molten iron at a very low level. In this study, the effects of temperature, the added amounts of sodium carbonate and anthracite, and the smelting time on the titanium content of molten iron were investigated using thermodynamic calculations and experiments. The results indicate that the introduction of sodium carbonate makes the reduction reaction of VTM a relatively low-temperature smelting system. In the smelting process, the Ti content in molten iron increases with the increase in temperature and decreases with the addition of sodium carbonate, while the amount of anthracite added has little effect on it. The appropriate technological parameters were determined as temperature: 1150–1250 °C, smelting time: ≥2 h, anthracite consumption: 25–35%, and sodium carbonate consumption: ≥60%. In addition, it was determined that the Ti impurities in the V-bearing pig iron were mainly (Ti,V)(C,N), CaTiO3, and Na2TiO3. All results obtained from this work contribute to the comprehensive utilization of VTM, and also provide theoretical support for the sodium smelting of VTM.

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“…Recently, significant efforts of researchers have been focused on the search for new and improving existing technologies for the production and refining of silicon, which make it possible to obtain high-quality silicon that most fully meets the requirements of consumers [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Impurities Formation during the Silicon Melt Crystallization

Tyutrin

Vasilyev

2022

MSF

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The study of the silicon crystallization mechanism by standard analytical methods is difficult since the temperature of liquid silicon in the ladle during oxidative refining is quite high rising to 1500-1600 °C. Therefore, the method of mathematical modelling was used. To understand the mechanism of inclusions formation in silicon the authors applied a method of computer-generated state diagrams of three-component systems using the soft package Diatris. The package allows one to study the behavior of components involved in various physical and chemical transformations, and the interaction of elements with each other during the crystallization of the silicon melt. This work studies the behavior of such impurities as Fe, Ti, B, and C. To achieve the set goals, the ternary diagrams were constructed and analyzed for the Si-Ti-Fe, Si-Ti-B, Si-Ti-C, Si-Fe-B, Si-Fe-C, and Si-B-C systems. To characterize the increase in the number of crystals when a multicomponent alloy passes the crystallization interval, the crystallization rate was calculated. It is established that the most probable impurity compounds in crystalline silicon are SiFe0.4B0.06, FeTiSi5, SiB0.06Ti0.33, and SiTi0.4C0.1.

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Removal of Phosphorus from Si-Fe Alloy by CaO-Al2O3-SiO2-Na2O Slag Refining

Cited by 7 publications

References 46 publications

Kinetic Analysis of Boron and Phosphorus Removal from Si-Fe Alloy by CaO-Al2O3-SiO2-Na2O Slag

Kinetic Analysis of Boron and Phosphorus Removal from Si-Fe Alloy by CaO-Al2O3-SiO2-Na2O Slag

Titanium Impurity Control in V-Bearing Pig Iron Prepared via the Sodium Smelting of Vanadium–Titanium Magnetite

Investigation of the Impurities Formation during the Silicon Melt Crystallization

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