抄録
In order to understand quantitatively the dephosphorization behavior of hot metals, the equilibrium distribution ratio of phosphorus between solid iron strip and molten CaO-SiO2-FeO(-CaF2) slags, violent CO evolution from molten iron being avoided, was measured in the temperature from 1300° to 1380° as a function of slag composition and then was converted for the hot metal system, using available thermodynamic data of phosphorus in solid and liquid irons.
The results are summarized as follows.
(1) Less basic slags than conventional steelmaking ones have sufficiently high dephosphorization capasity in the hot metal system.
(2) Fluorspar significantly promotes dephosphorization.
(3) Healy's equation which is applicable at steelmaking temperatures predicts far better dephospho rization than the present measurements for hot metals. Accordingly the equation is not valid at around 1300°C.
