Thermodynamic model for dephosphorization of CaO-SiO2-FeO-Al2O3-Na2O-TiO2-P2O5 slag

Sun Jiali; Liu Chengjun; Jiang Maofa

doi:10.7513/j.issn.1004-7638.2021.02.024

Volume 42 Issue 2

Apr. 2021

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Sun Jiali, Liu Chengjun, Jiang Maofa. Thermodynamic model for dephosphorization of CaO-SiO2-FeO-Al2O3-Na2O-TiO2-P2O5 slag[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(2): 146-151, 178. doi: 10.7513/j.issn.1004-7638.2021.02.024

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Sun Jiali, Liu Chengjun, Jiang Maofa. Thermodynamic model for dephosphorization of CaO-SiO₂-FeO-Al₂O₃-Na₂O-TiO₂-P₂O₅ slag[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(2): 146-151, 178. doi: 10.7513/j.issn.1004-7638.2021.02.024

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Thermodynamic model for dephosphorization of CaO-SiO₂-FeO-Al₂O₃-Na₂O-TiO₂-P₂O₅ slag

doi: 10.7513/j.issn.1004-7638.2021.02.024

Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China

Received Date: 2020-12-22
Publish Date: 2021-04-10

Abstract

Abstract

A prediction model for phosphorus distribution ratio of the CaO-SiO₂-FeO-Al₂O₃-Na₂O-TiO₂-P₂O₅ slag system was established based on the ion and molecule coexistence theory(IMCT). The influence of component changes on the phosphorus distribution ratio and the contributions of basic components to the phosphorus distribution ratio had been analyzed. The results indicate that the calculated phosphorus distribution ratio of model agrees well with the experimental phosphorus distribution ratio. The phosphorus distribution ratio first increases and then tends to be gentle with the increase of w(CaO), and the appropriate content of CaO is 30%. The phosphorus distribution ratio increases gradually with the increase of w(Na₂O), and Na₂O has stronger dephosphorization ability than CaO. The phosphorus distribution ratio increases with the increase of w(FeO), but decreases gradually with the increase of w(Al₂O₃), w(SiO₂) and w(TiO₂), and SiO₂ is more unfavorable to the dephosphorization ability of slag than Al₂O₃. The dephosphorization capacity of molten slag is mainly attributed to CaO and Na₂O.
- red mud,
- phosphorus slag,
- ion and molecule coexistence theory,
- thermodynamic model,
- activity,
- phosphorus distribution ratio

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References(20)

References

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