METHOD FOR SMELTING STAINLESS STEEL UNNECESSARY OF ELECTRIC POWER FOR SMELTING WITHOUT USING ELECTRIC FURNACE FOR PRODUCING RAW MATERIAL FERRO-CHROMIUM

摘要

PURPOSE:To produce a stainless steel at a low cost without using electric power by melting and perfectly reducing in a converter-type furnace after pre-reducing pellet of Cr ore and powdered coke in a rotary kiln to make high carbon ferro-chromium and executing vacuum decarbonizing refining, after adding iron scrap to this and melting. CONSTITUTION:After crashing the Cr ore, the coke powder, and pulp waste liquid and bentonite as binder is added and kneaded to make the pellet. The powdered coke as outer coating carbonaceous material, and silica and lime stone are added to the pellet and charged into the rotary kiln and heated at 1250-1400 deg.C, and after executing the pre-reduction of =60% of Cr2O3 and FeO in the Cr ore, this is charged into the converter as tiltable. Successively, O2 gas and fuel of coal, coke, etc., are blown and the pre-reduced pellet is melted with heat generation by burning be fuel, and also by reducing the remaining Cr2O3 and FeO, the high carbon ferro-chromium is produced. The iron scrap is added to this high carbon ferro-chromium and after melting in the converter, the vacuum decarbonizing treatment is executed to produce the stainless steel at a low cost without using the electric power.