The 41st Conference of the Blast Furnace, Coke Oven and Raw Materials Committee and National Open Hearth Steel Committee of the American Institute of Mining, Metallurgical and Petroleum Engineers, Cleveland, Ohio, April 14 to 16, 1958

Swartzman, E; Tibbetts, T E

doi:10.4095/305212

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“…However, the exception was high carbon heats (0.4 wt-% C aim) which were found to have low fluidity slags and higher final [P]. 122 Hence, TiO 2 is expected to increase the rate of dephosphorisation in high oxygen potential slags below CaO and MgO saturation. TiO 2 is expected to have a negative effect on the rate of dephosphorisation at low oxygen potentials and with high basicity slags due to an increase in apparent slag viscosity.…”

Section: Discussionmentioning

confidence: 99%

A review of phosphorus partition relations for use in basic oxygen steelmaking

Drain

Monaghan

Zhang

et al. 2017

Ironmaking & Steelmaking

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Phosphorus removal in basic oxygen steelmaking is a significant problem for integrated steelmakers. Phosphorus removal is required due to its deleterious effect on the mechanical properties of steel. However, this is progressively becoming more difficult due to the increasing phosphorus content of many iron ores. Many studies have investigated dephosphorisation and published empirical phosphorus partition (L P ) equations for a range of conditions. The structure of these equations has been used to develop a new partition relation that allows the effect of minor slag constituents such as TiO 2 , Al 2 O 3 and V 2 O 5 on steel dephosphorisation to be tested. Al 2 O 3 was found to have a weak negative effect on the measured L P , except at the lower oxygen potential range tested, where a positive correlation was observed. Increasing TiO 2 and V 2 O 5 contents were found to decrease the measured L P ; however, these correlations became less prevalent at the higher oxygen potential ranges tested. AbstractPhosphorus removal in basic oxygen steelmaking (BOS) is a significant problem for integrated steelmakers. Phosphorus removal is required due to its deleterious effect on the mechanical properties of steel. However, this is progressively becoming more difficult due to the increasing phosphorus content of many iron ores.Many studies have investigated dephosphorisation and published empirical phosphorus partition (L P ) equations for a range of conditions. The structure of these equations have been used to develop a new partition relation that allows the effect of minor slag constituents such as TiO 2 , Al 2 O 3 and V 2 O 5 on steel dephosphorisation to be tested. Al 2 O 3 was found to have a weak negative effect on the measured L P , except at the lower oxygen potential range tested, where a positive correlation was observed. Increasing TiO 2 and V 2 O 5 contents were found to decrease the measured L P , however these correlations became less prevalent at the higher oxygen potential ranges tested. Definitions and Nomenclature( ) = in slag solution [ ] = in liquid iron solution %i = mass % of i (%Fe t ) = mass% of total Fe in slag phase (%Fe t O) = mass% of total Fe in slag phase as FeO M i = molecular weight of oxide i R = universal gas constant, 8.314 JK -1 mol -1 N = mole fraction of oxide or ion = L P calculated by model � = L P calculated by linear regression line through results to the origin = optical basicity of slag Λ i = optical basicity of single oxide of species i T = Temperature in K 4

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Section: Discussionmentioning

confidence: 99%