On the Phosphorus Distribution between Slag and Metal

Abstract

It has been shown on the dephosphorization ofliquid iron that the values oflog ƒÁP2o•B or log(ƒÁP2o5/ ƒÁ5Feo)at 1873K calculated from the data independently investigated and recently reported are closely related to those of the theoretical optical basicity for each slag, and these relations can be expressed in a simple single line for the case, in which slag constituents are lime, sodium oxide and several other materials. The symbol"ƒÁ"signifies the activity coefficient of slag components in mole fraction unit. The relation between the phosphate capacity and ƒÁP2o5 or optical basicity was also discussed. The phosphorus distribution between eleven kinds of slags and liquid CuP alloys given by Young and Floridis was analysed by the same way. It would be possible by calculation to estimate a slag composition suitable for dephosphorization, having high theoretical optical basicity.

Effect of P2O5 Addition on the Viscosity and Structure of Titanium Bearing Blast Furnace Slags

“…The results indicated that the degree of viscosity increase with increasing P2O5 content was greater at lower basicity. It is consistent with the previous study, 19,20) which reported that the activity coefficient of P2O5 in slag melts was smaller at a higher basicity, and this resulted in a weak influence on the viscosity. Figure 6 shows the viscosity variation of the slag melts without P2O5 with varying basicity.…”

The Dynamic Interfacial Oxygen Potential Between Iron-Carbon Droplets and Oxidizing Slag

“…Molloseau and Fruehan [7] and Sarma [8] also observed a similar effect of FeO in the slag on mass transfer coefficient of FeO but did not offer a detailed explanation. From Figure 5, it is interesting to note that comparing data for high and low liquid fraction slags, they scale in reasonable approximation to the ratio of liquid fraction.…”

The Effect of Na2O and Al2O3 on Dephosphorization of Molten Steel by High Basicity MgO Saturated CaO-FeOx-SiO2 Slag

“…8,12,[21][22][23][24] In order to compare the present result with those of previous investigators, the theoretical optical basicity was applied and the values for the optical basicities were taken from the literature. 25) The relationship between phosphate capacities in logarithmic form and optical basicity is shown in Fig.…”