PURPOSE: To desulfurize anbd dephosphorize molten iron continuously witout intermediate slag discharge by desulfurizing the low Si molten iron in a mixer car by addition of a desulfurizing agent thereto then adding a dephosphorizing agent to the iron and blowing oxygen thereto.
CONSTITUTION: Low Si molten iron of ≤0.3% content of Si is put in a mixer car, and first a desulfurizing agent consisting essentially of CaC2 and CaO is blown thereto to convert the S contained therein to CaS and to remove the same as slag. In succession, a dephosphorizing agent consisting of a flux such as CaO, iron oxide, fluorite or the like and a reaction acceelerator of alkeli metal compds. such as sodium carbonate, sodium borate, cryolite or the like is blown into the molten iron and further gaseous oxygen is top blown to create an oxidizing atmoshere to remove P as P2O5 together with CaO in a stable form in slag, whereby the molten iron is dephosphorized. The molten iron is desulfurized and dephosphorized continuously with high heat efficiency without intermediate slag discharge and without decrease in productivity.
ITOU SHIYUUZOU
OOKAMI MASAHIKO
KATSUTA JIYUNICHIROU
KIMURA MASAYASU
| JPS5594415A | 1980-07-17 |
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