A Study on the Effect of Fluid Flow Into Non-Metallic Inclusion Changes

Ferreira, Matheus Esteves; Kumar, D.; Pistorius, Petrus Christiaan; Piva, S.

doi:10.33313/503/050

Cited by 2 publications

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“…Following each time step, the sizes of all inclusions were recalculated, to serve as input to the calculated collision rate in the next time step. Piva et al (2019) used a similar approach and concluded that Monte Carlo simulations for inclusion growth by collision validated their experimental work. Results of simulated inclusions sizes are shown in Figure 7.…”

Section: Inclusion Collision and Flotationmentioning

confidence: 92%

Liquid Inclusion Collision and Agglomeration in Calcium-Treated Aluminum-Killed Steel

2021

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This work addresses conflicting results in the literature regarding liquid inclusion agglomeration. To assess whether liquid calcium aluminates do agglomerate in liquid steel, laboratory experiments were performed: melting electrolytic iron, deoxidizing the melt with aluminum and subsequently calcium treating the deoxidation products (alumina and magnesia-alumina spinel inclusions). Under laboratory conditions, solid spinels and alumina inclusions were successfully modified, producing a new population of much smaller calcium aluminate inclusions. The new population of inclusions forms because the presence of calcium in the liquid steel destabilizes alumina and MgO-alumina inclusions, which then dissolve into the melt. The liquid inclusions exhibited a weak but statistically significant tendency to agglomerate. Laboratory results were assessed in the light of different collision mechanisms. Agglomeration mainly occurs by Stokes and laminar fluid flow collision when no external stirring is imposed. Monte Carlo simulations of collisions agree reasonably well with experimental results. For industrial conditions, where the liquid steel is agitated by argon bubbling and/or electromagnetic stirring, turbulent collisions dominate.

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Section: Inclusion Collision and Flotationmentioning

confidence: 92%

Liquid Inclusion Collision and Agglomeration in Calcium-Treated Aluminum-Killed Steel

2021

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Aluminum-Free Steelmaking: Desulfurization and Nonmetallic Inclusion Evolution of Si-Killed Steel in Contact with CaO-SiO2-CaF2-MgO Slag

Piva

Pistorius

2021

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In some applications, deep desulfurization and deoxidation of steels without the use of aluminum are required, using Si as a deoxidant instead, with double-saturated slags in the CaO-SiO2-CaF2-MgO system. This work studied the desulfurization and nonmetallic inclusion evolution for the system using an induction furnace and compared the results with FactSage kinetic simulations. Steel samples were taken from the steel melt and analyzed with ICP-MS and combustion analysis for chemistry, and SEM/EDS for nonmetallic inclusion quantity, size, and composition. The results indicate that the steel was deeply desulfurized, with a final sulfur partition coefficient of 580; MgO was reduced from the slag, yielding dissolved [Mg] that transformed liquid Mn–silicate inclusions into forsterite and MgO. Intentional reoxidation of the melt with oxidized electrolytic iron demonstrated a significant concentration of dissolved [Mg] in the steel, by the formation of additional forsterite and MgO upon reoxidation.

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A Study on the Effect of Fluid Flow Into Non-Metallic Inclusion Changes

Cited by 2 publications

References 0 publications

Liquid Inclusion Collision and Agglomeration in Calcium-Treated Aluminum-Killed Steel

Liquid Inclusion Collision and Agglomeration in Calcium-Treated Aluminum-Killed Steel

Aluminum-Free Steelmaking: Desulfurization and Nonmetallic Inclusion Evolution of Si-Killed Steel in Contact with CaO-SiO2-CaF2-MgO Slag

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