Activities of FeO and P2O5 in Dephosphorization Slags Coexisting with Solid Solutions between Di-calcium Silicate and Tri-calcium Phosphate

Ryota Matsugi, Kohei Miwa, Masakatsu Hasegawa
2017 ISIJ International  
Towards better understanding of the phosphorus removal from hot metal with low-basicity slags, electrochemical technique incorporating MgO-stabilized zirconia was conducted to measure simultaneously the activities of FeO and P 2 O 5 within heterogeneous CaO-SiO 2 -P 2 O 5 -FeO slags. The FeO activity was fairly insensitive to the variation of Ca 3 P 2 O 8 content in solid solutions between Ca 2 SiO 4 -Ca 3 P 2 O 8 , while the P 2 O 5 activity increased with an increase in Ca 3 P 2 O 8 content.
more » ... 3 P 2 O 8 content. By using the present values for activities, phosphorus distribution ratios were estimated between molten slag and carbon-saturated iron. The relationship between phosphorus distribution ratio and FeO content in molten slag was consistent with the phase diagram of the pseudo-ternary CaO-(SiO 2 + P 2 O 5 )-FeO system.
doi:10.2355/isijinternational.isijint-2017-082 fatcat:pvzvsrgqk5e6nlpjohyetm6ipm