Phosphate Capacity of the CaO-CaF2 System Containing Chromium Oxide.

Ostrovski, Oleg; Utochkin, Yu. I.; Павлов, А. В.; Akberdin, R. A.

doi:10.2355/isijinternational.34.849

Cited by 9 publications

(6 citation statements)

References 1 publication

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“…It is well known that the thermodynamic properties of molten oxides are determined by slag composition; therefore, extensive research on the slag chemistry-property relationships have been carried out to optimize slag composition for more effective reactivity of slags. [1][2][3][4] Slag composition also determines the physical properties of molten oxide mixtures, which is similarly important in the steelmaking process. For example, slag viscosity is important in BOF steelmaking and blast furnace ironmaking in terms of slag fluidity.…”

Section: Introductionmentioning

confidence: 99%

Viscosity of Highly Basic Slags

et al. 2007

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Section: Introductionmentioning

confidence: 99%

Viscosity of Highly Basic Slags

et al. 2007

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“…A comparison between the data of Tabuchi and Sano [4] and those of Yindong and Edstrom [5,6] shows that the phosphate capacity of CaO-CaF 2 slags decreased with increasing temperature, which would be expected since dephosphorization is an exothermic process. Ostrovski et al [7] indicated that even a small amount of chromium oxide (0.5-1 wt%) decreased the phosphate capacity of the CaOCaF 2 system from 10 22.1 to 10 21.3 to 10 21.6 at 1500 °C. To increase the phosphate capacity of this slag for chromium containing steels, Dee et al [8] partially replaced CaO with highly basic BaO.…”

Section: Introductionmentioning

confidence: 98%

“…Sano [2] and Ishii and Fruehan [3] have studied the use of MgO and CaO saturated fluoride slags, respectively, for dephosphorization and also the phosphate capacities of CaO-CaF 2 slags have been intensively studied at various temperatures [4][5][6][7][8]. Tabuchi and Sano [4] investigated the dephosphorization of steels containing chromium and manganese and reported that the logarithm of the phosphate capacity of their CaO-CaF 2 slag was 22.0 at 1500 °C and CaO saturation.…”

Section: Introductionmentioning

confidence: 99%

Phosphate Capacities of CaF2-MgO and CaF2-CaO-MgO Slags

Akbari

Pickles

2015

High Temperature Materials and Processes

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Previously published sulphide capacity data and thermodynamic arguments have been employed to calculate the phosphate capacities and the phosphorus partition ratios between a molten carbon saturated iron alloy and binary CaF 2 -MgO slags and also ternary CaF 2 -CaO-MgO slags at 1450 °C. For the CaF 2 -MgO binary system, a linear relationship was found between the phosphate and the sulphide capacities as follows: − = 3 4 PO log C + s 1.2 log C 25.2. For the ternary CaF 2 -CaO-MgO system at 1450 °C, the logarithm of the calculated phosphate capacities ranged from 19.47 to 20.15. With the addition of CaO, the phosphate capacities initially increased, reached a maximum and then decreased slightly. The addition of MgO to the CaF 2 -CaO system resulted in a decrease in the phosphate capacity. The calculated phosphorus partition ratios increased slightly with increasing mole fraction of CaO in the ternary system.

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“…CaO-based slag is traditionally used in the steelmaking process because of its high refining ability and low cost. [10][11][12][13][14][15][16][17][18][19][20][21][22] Previous studies generally reported that phosphate capacity and the distribution ratio of phosphorus increased with the increasing CaO content, thereby increasing the stability of P 2 O 5 by decreasing the activity coefficient of P 2 O 5 in the slags. In other words, dephosphorization ability is strongly affected by CaO activity in CaO-based slags, and thus the phosphorus equilibria in CaO-saturated highly basic slags have been reported.…”

Section: Introductionmentioning

confidence: 98%

Effect of Direct Reduced Iron (DRI) on Dephosphorization of Molten Steel by Electric Arc Furnace Slag

Heo

Park

2018

Metall Mater Trans B

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We investigated the effect of direct reduced iron (DRI) addition on dephosphorization of molten steel by electric arc furnace (EAF) slag at 1823 K (1550°C). Various phenomena such as CO gas evolution and slagmaking by gangue oxides in DRI were experimentally observed at each reaction step. Thermodynamic behaviors of phosphorus, oxygen, and carbon were strongly dependent on DRI content. Basicity, which is the thermodynamic driving force of dephosphorization, decreased with the increasing DRI content because SiO 2 concentration in the slag was proportional to DRI addition. The excess free energy of P 2 O 5 increased with the increasing SiO 2 content in slag. A higher DRI content made dephosphorization difficult by decreasing the basicity and stability of P 2 O 5 in the slag. Therefore, when using DRI in EAF process, it is very important to control the basicity of slag.

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Phosphate Capacity of the CaO-CaF2 System Containing Chromium Oxide.

Cited by 9 publications

References 1 publication

Viscosity of Highly Basic Slags

Viscosity of Highly Basic Slags

Phosphate Capacities of CaF2-MgO and CaF2-CaO-MgO Slags

Effect of Direct Reduced Iron (DRI) on Dephosphorization of Molten Steel by Electric Arc Furnace Slag

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