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- Title
Critical Assessment of PO Activity Coefficients in CaO-based Slags during Dephosphorization Process of Iron-based Melts.
- Authors
Yang, Xue-min; Li, Jin-yan; Chai, Guo-Ming; Duan, Dong-ping; Zhang, Jian
- Abstract
According to the experimental results of hot metal dephosphorization by CaO-based slags at a commercial-scale hot metal pretreatment station, activity $$ a_{{{\text{P}}_{ 2} {\text{O}}_{ 5} }} $$ of PO in the CaO-based slags has been determined using the calculated comprehensive mass action concentration $$ N_{{{\text{Fe}}_{t} {\text{O}}}}^{{}} $$ of iron oxides by the ion and molecule coexistence theory (IMCT) for representing the reaction ability of FeO, i.e., activity of $$ a_{{{\text{Fe}}_{t} {\text{O}}}}^{{}} $$ . The collected ten models from the literature for predicting activity coefficient $$ \gamma_{{{\text{P}}_{ 2} {\text{O}}_{ 5} }} $$ of PO in CaO-based slags have been evaluated based on the determined activity $$ a_{{{\text{P}}_{ 2} {\text{O}}_{ 5} }} $$ of PO by the IMCT as the criterion. The collected ten models of activity coefficient $$ \gamma_{{{\text{P}}_{ 2} {\text{O}}_{ 5} }} $$ of PO in CaO-based slags can be described in the form of a linear function as $$ \log \gamma_{{{\text{P}}_{ 2} {\text{O}}_{ 5} }} \equiv y = c_{0} + c_{1} x $$ , in which independent variable $$ x $$ represents the chemical composition of slags, intercept $$ c_{0} $$ including the constant term depicts temperature effect and other unmentioned or acquiescent thermodynamic factors, and slope $$ c_{1} $$ is regressed by the experimental results. Thus, a general approach for obtaining good prediction results of activity $$ a_{{{\text{P}}_{ 2} {\text{O}}_{ 5} }} $$ of PO in CaO-based slags is proposed by revising the constant term in intercept $$ c_{0} $$ for the collected ten models. The better models with an ideal revising possibility or flexibility in the collected ten models have been selected and recommended.
- Subjects
IRON oxides; PHOSPHORUS; LIME (Minerals); SLAG; MELTING; CHEMICAL reactions; THERMODYNAMICS
- Publication
Metallurgical & Materials Transactions. Part B, 2016, Vol 47, Issue 4, p2330
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-016-0654-5