PURPOSE: To execute adequate pre-refining without excess pre-refining by taking an intermediate sample during the pre-refining and adjusting addition or pre-refining agent according to the analytical result of the intermediate sample at the time of executing desiliconizing, dephosphorizing and desulfurizing pre-refining to molten iron from a blast furnace before decarbonizing steelmaking refining.
CONSTITUTION: At the time of producing molten steel with the oxidized decarbonizing refining through oxygen blowing by charging the molten iron from the blast furnace into a converter, the pre-refining of desiliconization, dephosphorization, desulfurization, etc., is executed before charged to the converter. In this case, contents of impurities of Si, P, S, etc., and temp. in the molten iron from the blast furnace are measured and beforehand the necessary adding quantities of fluxes for pre-refining of desiliconization, dephosphorization, desulfurization, etc., and pre-refining time are obtd. On the way of pre-refining by blowing the fluxes with carrier gas, the sample of molten iron is taken and quantities of the fluxes for pre-refining to be added are adequately controlled according to the analyzed values and end point of the pre-refining is surely decided so as to come to suitable quality to charge to the converter without the excess refining, and always this is supplied into the converter as the molten iron having little dispersion of the quality.
| JP3448427 | FLEXIBLE TYPE OPTICAL FIBER GUIDE PIPE |
| JP4795084 | How to melt cold iron source |
| JPH07258712 | METHOD FOR PRE-TREATING MOLTEN IRON |
AIDA EIJI
MORIYAMA YUKIHISA
GOTO HIRONORI
| JPS58224105A | 1983-12-26 | |||
| JPS57131309A | 1982-08-14 | |||
| JPS57131310A | 1982-08-14 |