Numerical Study into Gravity Separation of Phosphorus from BOS Slag during Solidification

Nguyen, Thi Bang Tuyen; Mitra, Subhasish; Evans, Geoffrey M.; Monaghan, Brian J; Zulli, Paul; Jang, Kyoung Oh; O’Dea, Damien; Honeyands, Tom

doi:10.2355/isijinternational.isijint-2020-450

Cited by 3 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The opposing effects were demonstrated in the authors previous work. [12] A simplified version of the above momentum equation can be represented via a characteristic velocity driven by the thermalsolutal convection, which can be written as:…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Unlike solidification of the pure compounds, the liquid fraction of the binary mixtures is influenced by the convection and diffusion of the two species, as shown between Eqs. [8] and [12]. The mass fraction of the species on the liquidus (Y i,liq ), and the solidus side (Y i,sol ) was computed by Eqs.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…In this section, the steps undertaken to obtain a simplified (pseudo) binary diagram for a BOF slag from its representative CaO-FeO-SiO 2 ternary diagram [21] is presented. The slag composition used in this study came from a set of synthetic slag experiments with basicity CaO/SiO 2 of 2.6, used in the authors earlier work, [12] i.e. 39.1 pct CaO, 30.8 pct Fe 2 O 3 , 14.8 pct SiO 2 , 5.7 pct P 2 O 5 , 4.7 pct MgO, and 4.95 pct Al 2 O 3 .…”

Section: Pseudo Binary Phase Diagram For Bof Slagmentioning

confidence: 99%

“…[5][6][7][8] Acid leaching for removing the P-rich phase [9][10][11] requires energy intensive conditions such as crushing/grinding and low cooling rate presenting economical restrictions to its industrial application. Separation due to gravity by floating of the C 2 S-C 3 P crystals was shown possible under a low cooling rate of below 2 °C/m [8,[12][13][14] which could only be implemented under controlled cooling. Ideally separation should be undertaken whilst the slag is in the liquid state so that crushing or grinding are not be required.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Segregation of a Phosphorus Rich Phase During Differential Solidification of BOF Slag

Nguyen

Mitra

Evans

et al. 2022

Metall Mater Trans B

Self Cite

View full text Add to dashboard Cite

This study investigated the segregation behaviour of the phosphorus rich (P-rich) phase from the iron-rich (Fe-rich) phase in steelmaking slag from laboratory to industrial scale using computational fluid dynamics (CFD) in order to propose a suitable separation practice for the P-rich phase. Crucible experiments and corresponding CFD simulations using enthalpy-porosity approach were first performed to verify the concentration difference of phosphorus in the two phases. Both simulation and experimental results showed ~ 17 to 18 pct increase in phosphorus concentration in the top region of the crucible after solidification. The simulations were then scaled up to an industrial slag pot and slag pit. Reasonable agreement was obtained with published results for phosphorus concentration, and the total liquid amount in the 16-tonne slag pot, under practical cooling conditions. Simulations in the 30-tonne slag pit with in-ground insulation showed an increase of ~ 25 pct of the P-rich phase in the top region (while concentrating the Fe-rich phase in the bottom region). Differential concentration of the P-rich phase within the slag (as a result of heat transfer, micro/macro-segregation) suggested that separation of phosphorus in industrial scale slag pot and slag pit—as batch systems—is possible. Suggestions for separation in continuous operation are also discussed.

show abstract

Section: Simulation Resultsmentioning

confidence: 99%

Section: Simulation Resultsmentioning

confidence: 99%

Section: Pseudo Binary Phase Diagram For Bof Slagmentioning

confidence: 99%