Phosphorus distribution between liquid iron and MgO saturated slags of the system CaO-MgO-FeOx-SiO2.

Abstract

SynopsisExperiments have been made to study the phosphorus distribution between liquid iron and the Ca0-Si02 FeOx slag equilibrated in a magnesia crucible in the temperature range 1550° to 1650°C.The phosphorus distribution ratio (P205)/[P] increased with increasing Ca0 content and decreasing temperature. The maximum value of the distribution ratio was found to be present near the slag composition saturated with the tricalcium silicate and the magnesio wustite phases. The experimentally determined phosphorus content in metal disagrees with the phosphorus contents estimated from the treatments proposed by Balajiva et al., Turkdogan and Pearson, and Hea y over the present range of slag compositions, except by Flood and Grjotheim.

A Model for Activity Coefficient of P₂O₅ in BOF Slag and Phosphorus Distribution between Liquid Steel and Slag

“…The results 8) offers the best agreement while that of Turkdogan 9) shows slightly more scatter. However, the results differ from the values calculated through Eq.…”

“…The ranges of CaO concentrations in the data used by the authors, 1,2) Suito et al 8) and Turkdogan and Pearson Similarly, the ranges of FeO concentrations in the data used by Suito et al 8) and Turkdogan and Pearson 3) varied as N FeO ϭ0.2-0.29 and 0.11-0.22, respectively. On the other hand, the range of FeO concentrations in the work of the present authors 1,2) was N FeO ϭ0.05-0.36 (X Fe 2ϩϭ0.07-0.42).…”

“…67 It is interesting to note that g P 2 O 5 is independent of temperature in this correlation. Unfortunately, the works of Suito et al 8) as well as Turkdogan 9) persisted with the assumption of ideal Henrian behaviour of phosphorus and oxygen in liquid iron.…”

Phosphate Capacity of CaO–SiO2–MnO–FeO Slag Saturated with MgO

“…slags at 1 823 K increases and is followed by a constant value within some experimental scatters. 5,6) However, the phosphate capacity of the Na 2 O-SiO 2 -Fe t O-5(Ϯ1)mass%MnO-MgO satd. system, which can be considered to be more basic than lime-based slags, linearly increases with increasing basicity index at 1 873 K. 8) Based on a definition of phosphate capacity given in Eq.…”

“…The phosphate capacity of various MgO-saturated slags measured by several authors was also shown for comparison. [5][6][7][8][9][10][11][12] Here, the phosphate capacity of the slag was calculated from Eqs. (2) and (4).…”