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Enrichment Mechanism of Phosphate in CaO-SiO2-FeO-Fe2O3-P2O5 Steelmaking Slags

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Abstract

The phosphate-enrichment behavior has experimentally been investigated in CaO-SiO2-FeO-Fe2O3-P2O5 steelmaking slags. The reaction ability of structural units in the slags has been represented the mass action concentration \( N_{i} \) from the developed ion and molecule coexistence theory (IMCT)-\( N_{i} \) model based on the IMCT. The defined enrichment possibility \( N_{{{\text{c}}i{\text{ {-}c}}j}} \) and enrichment degree \( R_{{{\text{c}}i{\text{{-}c}}j}} \) of solid solutions containing P2O5 from the developed IMCT-\( N_{i} \) model have been verified from the experimental results. The effects of binary basicity, the mass percentage ratio \( {{ ( {\text{pct Fe}}_{t} {\text{O)}}} \mathord{\left/ {\vphantom {{ ( {\text{pct Fe}}_{t} {\text{O)}}} { ( {\text{pct CaO)}}}}} \right. \kern-0pt} { ( {\text{pct CaO)}}}} \), and mass percentage of P2O5 in the initial slags on phosphate-enrichment behavior in the slags has also been discussed. The results show that the P2O5 component can easily be bonded by CaO to form tricalcium phosphate 3 CaO·P2O5, and the formed 3CaO·P2O5 can react with the produced dicalcium silicate 2CaO·SiO2 to generate solid-solution 2CaO·SiO2-3CaO·P2O5 under fixed cooling conditions. The maximum value of the defined enrichment degree \( R_{{{\text{C}}_{ 2} {\text{S{-}}} {\text{C}}_{ 3} {\text{P}}}} \) of solid-solution 2CaO·SiO2-3CaO·P2O5 is obtained as 0.844 under conditions of binary basicity as 2.5 and the mass percentage ratio \( {{ ( {\text{pct Fe}}_{t} {\text{O)}}} \mathord{\left/ {\vphantom {{ ( {\text{pct Fe}}_{t} {\text{O)}}} { ( {\text{pct CaO)}}}}} \right. \kern-0pt} { ( {\text{pct CaO)}}}} \) as 0.955 at fixed cooling conditions.

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Abbreviations

\( a_{{{\text{R,}}i}} \) :

Activity of components i in slags relative to pure solid or liquid component i as standard state with mole fraction \( x_{i} \) as concentration unit and following the Raoult’s law, i.e., \( a_{{{\text{R,}}i}} = x_{i} \gamma_{i} \), (−)

\( b_{i} \) :

Mole number of component i in 100-g slags before reaction equilibrium, having the same meaning with \( n_{i}^{0} \), (mol)

\( \Delta_{\text{r}} G_{{{\text{m, }}i}}^{\Theta } \) :

Standard molar Gibbs free energy change of reaction for forming component i or structural unit i, (J/mol)

\( K_{i}^{\Theta } \) :

Standard equilibrium constant of chemical reaction for forming component i or structural unit i, (−)

M i :

Relative atomic mass of element i or relative molecular mass of component i, (−)

\( n_{i} \) :

Equilibrium mole number of structural unit i or ion couple i in 100-g slags based on the IMCT, (mol)

\( \Sigma n_{i} \) :

Total equilibrium mole number of all structural units in 100-g slags based on the IMCT, (mol)

\( N_{i} \) :

Mass action concentration of structural unit i or ion couple i in slags based on the IMCT, (−)

\( N_{{{\text{c}}i {\text{{-}c}}j}} \) :

Defined enrichment possibility of solid solution containing P2O5 based on the calculated mass action concentration \( N_{i} \) of complex molecule ci and cj, (−)

R :

Gas constant, (8.314 J/(mol·K))

\( R_{{{\text{c}}i {\text{{-}c}}j}} \) :

Defined enrichment degree of solid solution containing P2O5, (−)

\( R_{\text{P}} \) :

Determined enrichment ratio \( R_{\text{P}} \) of phosphorus, (−)

T :

Absolute temperature, (K)

(pct i):

Mass percentage of component i in slags, (−)

(i):

Species i in slag phase, (−)

\( \gamma_{i} \) :

Activity coefficient of component i in slags related with activity \( a_{{{\text{R,}}i}} \), (−)

ci :

Molecule ci or compound ci or compound i of calcium silicates, (−)

cj :

Molecule cj or compound cj or compound j containing P2O5, (−)

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Acknowledgments

The work was financially supported by the National Natural Science Foundation of China (Nos. 51372019, 51174186, 51072022, and 50874013) and the National Basic Research Program of China (No. 2014CB643401).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy and School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Jin-yan Li (Ph.D. Candidate), Mei Zhang (Professor) & Min Guo (Professor)

  2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P.R. China

    Xue-Min Yang (Research Professor)

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  1. Jin-yan Li
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Correspondence to Min Guo.

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Manuscript submitted December 20, 2013.

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Li, Jy., Zhang, M., Guo, M. et al. Enrichment Mechanism of Phosphate in CaO-SiO2-FeO-Fe2O3-P2O5 Steelmaking Slags. Metall Mater Trans B 45, 1666–1682 (2014). https://doi.org/10.1007/s11663-014-0085-0

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