| 摘要 |
<p>PURPOSE:To recover a valuable element Cr at a low cost in a high yeild in the stage of producing a crude stainless steel in electric furnaces by providing low basicity to slag by using a small amt. of lime in a certain electric furnace, reusing the low basicity slag contg. much Cr2O3 in another electric furnace and reducing Cr2O3. CONSTITUTION:Crude steel is produced in plural electric furnaces of 2-3 times operating time as compared with an AOD furnace and is fed to the AOD furnace wherein the steel is refined to a stinless steel in the stage of refining the melt of a crude stainless steel in the AOD furnace. The amt. of the lime to be used as a flux is decreased to provide low basicity to the slag in the stage of producing the crude stainless steel from stainless steel scrap, Fe-Cr, Fe-Ni, etc. as raw material in an electric furnace A. The slag which is small in amt. and contains substantial Cr2O3 is used as the raw material in the stage of producing the crude stainless steel in the furnace B. The crude stainless steel is produced with the overall small amt. of the lime to be used and in a high recovery rate of Cr.</p> |
