Thermodynamics of dephosphorization capacity of containing TiO2 and Al2O3 of CaO-based semi-steel slag

ZHANG Meng-Bo

doi:10.13228/j.boyuan.issn0449-749x.20170408

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Iron and Steel ›› 2018, Vol. 53 ›› Issue (3) : 27-37. DOI: 10.13228/j.boyuan.issn0449-749x.20170408

Thermodynamics of dephosphorization capacity of containing TiO2 and Al2O3 of CaO-based semi-steel slag

ZHANG Meng-Bo

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Abstract

A dephosphorization thermodynamic model was established based on the coexistence theory and the principle of metallurgical dephosphorization. The thermodynamic study on the phosphorus distribution ratio and phosphate capacity of CaO-based steel slag which contained TiO2 and Al2O3 was carried out， and the thermodynamic model of phosphorus distribution ratio and phosphorus capacity of containing TiO2 and Al2O3 of CaO-based semi-steel slag were obtained. The calculated results indicate that the ability of dephosphorization would be reduced with the increase of[w((TiO2))]and [w((Al2O3))，]especially under the low temperature and low alkalinity conditions. The effect of TiO2 is greater than that of Al2O3 with the same content of the two oxides. The phosphorus distribution ratio and phosphate capacity increase first and then are almost invariant with the increase of alkalinity， increase first and then decreased as[w((FeO))]increasing， and decrease with the[w((MgO))]increasing. Semi-steel is smelted by semi-steel slag ball， and the[w((TiO2)＋(Al2O3))]and [w((FeO))]increase as semi-tempered slag ball isused， and[w((MgO))]decreases. On accounting of the synergistic action of FeO and MgO， the phosphorus distribution ratio and phosphate capacity increase. It is better for the increase of the phosphorus distribution ratio and phosphate capacity and weakening the influence of[w((TiO2)＋(Al2O3))]when the basicity of slag is about 4.0 and[w((FeO))≤20.0%，]and the proportion of semi-tempered slag ball is 15.0 %-20.0 % of total slag.

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ZHANG Meng-Bo. Thermodynamics of dephosphorization capacity of containing TiO2 and Al2O3 of CaO-based semi-steel slag[J]. Iron and Steel, 2018, 53(3): 27-37 https://doi.org/10.13228/j.boyuan.issn0449-749x.20170408

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