METAL DEOXIDIZING AND MODIFYING METHOD AND APPARATUS Russian patent published in 2004 - IPC

FIELD: metallurgy, in particular, steel deoxidation and modification.

SUBSTANCE: method involves heating and melting reactant in the form of mixture including ground metal aluminum and at least one alkaline-earth metal; feeding reactant in gas flow from at least one hopper through tuyere submerged under liquid metal surface; creating in tuyere and hopper pressure exceeding ferrostatic pressure occurring at site of depth, where reactant is fed into metal; providing contacting of metal and reactant in molten state. Heating and melting of mixture are performed at site of depth, where said mixture is fed into metal. Excessive pressure is maintained in tuyere and hopper at level providing melting of mixture before it comes into contact with metal without boiling of mixture components. Apparatus has lined vessel for melt, at least one hopper for ground reactant, connecting unit mounted for displacement in vertical plane with respect to vessel, bar with bell and tuyere concentrically arranged inside bar and connected with hopper and gas supply pipeline. Bar and tuyere are fixed on connecting unit. Apparatus is fitted with system for regulating excessive pressure in tuyere and hopper, and reactant melting chamber made in the form of vessel equipped with randomly oriented openings formed in wall and bottom, with typical opening size being less than minimal size of ground reactant particles. Reactant melting chamber is positioned under bell. Ratio of volumes of bell and reactant melting chamber is 1.2-3.1.

EFFECT: reduced consumption of reactant, improved quality of metal and reduced consumption of power for melting of reactant and for transportation of liquid reactant.

5 cl, 2 dwg, 1 ex