PROCESS FOR PREPARING FOAMED SLAG AND KEEPING ITS DENSITY AND OTHER PROPERTIES ON THE WHOLE SURFACE OF MELT IN BATH AT MELTING STEEL IN ELECTRIC ARC FURNACE Russian patent published in 2006 - IPC C21C5/54 

FIELD: metallurgy, namely steel production in arc steel melting electric furnaces.

SUBSTANCE: process comprises steps of supplying carbon containing materials and oxidizing agents onto melt through tuyeres arranged along perimeter of furnace; using materials containing calcium oxide as slag forming materials and using materials containing iron oxides and(or) gaseous mixtures containing oxygen as oxidizing agents; feeding iron oxides and(or) oxygen from gaseous mixture to furnace at relation of such components to calcium oxide (3 - 7): 1 at total flow rate of calcium oxide 3 - 15 kg/t of steel; adding carbon containing materials to bath at rate 4 - 10 kg/t of steel per min; setting quantity N of tuyeres depending upon melting mass according to formula: N = 3 + (0.03 x G -1) where G - mass of melting, t; 3 - minimum quantity of tuyeres for melting mass less than 50 t; 1, 0.03 - factors setting number of additional tuyeres in accordance with volume. Invention provides energy consumption lowered by 190 k Wt-h/t and melting process duration shortened by 9 min.

EFFECT: reduced costs for performing melting process.

6 cl, 2 ex