Process for dephosphorization, desulfurization and denitrificati

Details Process for dephosphorization, desulfurization and denitrificati Process for dephosphorization, desulfurization and denitrificati

1981-10-16

1983-07-05

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 58, 75257, C21C 702

Patent

active

043916333

ABSTRACT:
A process for dephosphorization, desulfurization and denitrification of chromium-containing pig iron comprising contacting the melt of said iron with a slag comprising not less than 10% and less than 40% of CaO, not less than 5% and not more than 40% of iron oxides and more than 40% and not more than 80% of CaF.sub.2 in which the content of SiO.sub.2 as an impurity is not more than 10% and that the ratio %CaO/%SiO.sub.2 is not less than 3 is disclosed. According to this process, oxidation dephosphorization of chromium-containing pig iron is effectively and economically achieved. Simultaneously desulfurization and denitrification thereof are effected, too.

REFERENCES:
patent: 3695946 (1972-10-01), Demeaux
patent: 4217134 (1980-08-01), Russell
patent: 4263043 (1981-04-01), Haida et al.
patent: 4274869 (1981-06-01), Kristiansen et al.

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