MODIFICATOR FOR METALLURGIC DROSS OF MAGNESIA COMPOSITION AND METHOD FOR PRODUCING THE SAME Russian patent published in 2005 - IPC

FIELD: metallurgy, in particular flux to modify chemical composition of steel-smelting dross in steel-smelting industry.

SUBSTANCE: according to invention known metallurgical dross modifier, containing calcium oxide, iron oxide, magnesia and silica, consists (mass %) as reduced to annealed material: calcium oxide 0.50-10.0; silica 0.5-5.0; iron oxide 0.5-6.0; and balance: magnesia in carbonate and hydrate forms at ratio of 0.5-2. To indemnify heat consumption for modifier dissolution it additionally contains 5-10 % of carbon. Modifier is produced by simultaneous dry grinding and mixing of batch components, containing virgin magnesite and calcined magnesite at mass ratio of (30:70-70:30), palletizing of grinded mixture in pelletizer with water up to specific surface of 0.6-1.2 m²/g; keeping of palletized material under static conditions and recovery of target grains with size of 5-40 mm. Before mixing 5-15 % of carbon as reduced to total mass in form of coke fines may be added to batch. After mixing process batch components may be humidified in mixer with 25-30 % of water and fashioned in briquette of volume up to 70 cm³.

EFFECT: modifier of magnesia composition with high basicity, strength, rate of dispersion and dissolution in steel-smelting dross melts.

6 cl, 2 ex, 3 tbl