A Thermodynamic Model for Predicting Phosphorus Partition between CaO-based Slags and Hot Metal during Hot Metal Dephosphorization Pretreatment Process Based on the Ion and Molecule Coexistence Theory

摘要: A thermodynamic model for predicting phosphorus partition L P between a CaO-based slags and hot metal during dephosphorization pretreatment process has been developed based on the ion molecule coexistence theory (IMCT), i.e., IMCT–L model. The reaction abilities of structural units or couples in have represented by calculated mass action concentrations N i through IMCT–N IMCT. verified to be valid comparing with measured as well predicted two reported models from literature. Besides total slag metal, respective partitions P,i nine products P2O5, 3FeO·P2O5, 4FeO·P2O5, 2CaO·P2O5, 3CaO·P2O5, 4CaO·P2O5, 2MgO·P2O5, 3MgO·P2O5, 3MnO·P2O5 can also accurately formed 3CaO·P2O5 accounts 99.20 pct generated 4CaO·P2O5 0.08 pct. comprehensive effect CaO+Fe t O, which described percentage ratio (pct Fe O)/(pct CaO) concentration $$ {{N_{{{\text{Fe}}_{t} {\text{O}}}}} \mathord{\left/{\vphantom {N_{\text{CaO}}}}} \right. \kern-0pt} {N_{\text{CaO}}}} $$ product O) × (pct N_{{{\text{Fe}}_{t} {\text{O}}}}^{5} \times N_{\text{CaO}}^{3} , controls ability slags. linear relationship against correlated compared parabolic while established. Thus, are recommended represent O Furthermore, binary basicity complex CB2 CB3 established at 1.8 2.0 corresponding maximum However, optical only mathematically regressed \varLambda_{\text{FeO}}  = 1.0 \varLambda_{{{\text{Fe}}_{ 2} {\text{O}}_{ 3}}} =0.75. great gradient oxygen potential activity a %,O dynamically film beneath slag–metal interface bath is main driving forces high content low carbon exchanged replaced elements until mainly saturated