Thermodynamic Modelling of Phosphorus in Steelmaking Slags
The published phase diagrams of some key P -containing systems which are relevant to the steelmaking slag and the available experimental data on phosphorus partitioning between liquid iron and slags consisting of SiO -Al -Fe -FeO-MnO-MgO-CaO-Na O have been reviewed and assessed. A set of data under...
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Published in | High temperature materials and processes Vol. 32; no. 3; pp. 237 - 246 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Berlin
De Gruyter
01.06.2013
Walter de Gruyter GmbH |
Subjects | |
Online Access | Get full text |
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Summary: | The published phase diagrams of some key P
-containing systems which are relevant to the steelmaking slag and the available experimental data on phosphorus partitioning between liquid iron and slags consisting of SiO
-Al
-Fe
-FeO-MnO-MgO-CaO-Na
O have been reviewed and assessed. A set of data under carefully controlled experimental conditions, which was considered to be more reliable based on the assessment, was selected for optimising the generalised central atom (GCA) model parameters of phosphorus-containing slag systems. The developed model database is proved to be able to represent the liquidus temperature of some key P
-containing systems and the phosphorus distribution ratio between the steelmaking slags and liquid iron reasonably well. With the developed GCA model database, the dephosphorization reaction in the steelmaking process was modelled under various operating conditions such as slag chemistry and temperature. The results show that the phosphorus distribution ratio between the slags and liquid iron displays a maximum point with variation of the FeOx content in the slag. It also shows that the phosphorus deportment to the slag is favored by decreasing the operating temperature and MgO content, and increasing the CaO/SiO
ratio in the slag. Comparison with the model of the phosphorus distribution data from a commercial BOS furnace shows that operating conditions do not permit to reach P equilibrium contents. The dis-equilibrium degree of P was found to be increased with increasing slag viscosities. |
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ISSN: | 0334-6455 2191-0324 |
DOI: | 10.1515/htmp-2012-0129 |