Abstract
In new smelting processes, such as HIsmelt, significant dephosphorisation occurs. Whereas there have been many studies of the phosphorus reaction in steelmaking, there have been few studies of the phosphorus equilibrium reaction relevant to smelting slags. A study of the phosphorus equilibrium reaction between liquid iron and MgO saturated slag with low basicity and low iron oxide content is reported. The phosphate capacity and phosphorus distribution ratio have been measured as a function of slag composition at 1823 K. Also, the phosphorus distribution ratio between carbon saturated liquid iron and slag at equilibrium has been calculated from experimental data. The phosphorus distribution ratio is in reasonable agreement with the industrial data for HIsmelt. The results indicate that significant phosphorus renewal can be achieved in smelting processes.
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