METHOD OF BLOWING METAL WITH GAS IN LADLE Russian patent published in 1997 - IPC

FIELD: metallurgical industry. SUBSTANCE: method implies immersion of refractory pipe into metal, blowing of metal by delivering gas into pipe under pressure, varying immersion depth of pipe end, and also recording of gas pressure at pipe inlet in process of blowing. Additionally, immersion depth of pipe end is recorded at start of blowing. Immersion of pipe into metal is effected at start of blowing, and varying of gas pressure at inlet to pipe is effected with fixing pressure corresponding to fixed immersion depth of pipe end at start of blowing. Current value of immersion depth of pipe end in process of blowing is determined according to following relation: H = K(P ± ΔP), where H - current value of immersion depth of pipe end below metal top level, m; P - gas pressure at pipe inlet corresponding to fixed depth of immersing pipe end at start of blowing, kg/sq.m; ΔP - current value of varying gas pressure at pipe inlet in course of blowing, kg/sq.m; K - empirical coefficient taking into consideration hydrodynamic relationships of gas outflow from pipe in liquid metal, assumed as being equal to 0.00008-0.00015 cu.m/kg. EFFECT: high efficiency. 1 cl, 1 tbl