PRODUCTION OF LOW PHOSPHORUS MOLTEN IRON UTILIZING SCRAP MELTING

摘要

PURPOSE:To efficiently produce a low phosphorus molten iron while utilizing melting of large quantity of scrap by charging the prescribed quantity of molten iron and a large quantity of scrap into a converter, executing dephosphorize-refining, leaving unmolten scrap and tapping steel. CONSTITUTION:Into converter or the converter-type refining vessel, the prescribed molten iron and quantity of more than the wt. possible to be melted in a single dephosphorizing treatment, are charged. Successively, the prescribed quantities of refining agent and oxygen are charged into this refining vessel to execute the deposphorize- refining. Thereafter, the refining vessel is tilted, and while leaving the unmolten scrap in the vessel, the molten low phosphorus iron after refining is discharged into a carrying vessel. Successively, in the condition of leaving the unmolten scrap, the prescribed molten iron is charged into the refining vessel to execute dephosphorize-refining. At this time, in the dephosphorize-refining after the second time, the melting of the remained scrap is promoted in the sufficiently preheated condition. By this method, the low phosphorus molten iron is obtd. while utilizing melting of a large quantity of scrap without generating extension of the refining time, scrap working process, oxidizing loss of C in the molten iron, etc.