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US 4,599,107 AGranted
Method for controlling secondary top-blown oxygen in subsurface pneumatic steel refining
AssigneeUnion Carbide Corporation
InventorIan F. Masterson
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Abstract
A steelmaking method which enables accurate prediction of the split of top-injected oxygen between that which reacts with the bath and that which reacts with carbon monoxide above the bath.
Claims15
A method for refining a carbon-containing steel melt in a refining vessel, comprising:
- (a) injecting oxygen into the steel melt from below the bath surface:
- (d) reacting at least some of the subsurface injected oxygen with carbon in the melt to produce carbon monoxide which rises up through and out of the bath;
- (c) injecting oxygen through a lance into the headspace above the bath surface;
- (d) reacting a first portion P of the top-injected oxygen with components in the bath wherein
- P=K-(1629/sec) (L/V)
- where P is the percent of top-injected oxygen which reacts with bath components, L is the height of the lance opening above the bath surface in feet, V is the velocity of the oxygen injected from the lance in feet per second, and K is a constant having a value of from 56 to 72;
- and
- (e) reacting remaining top-injected oxygen with said rising carbon monoxide in the headspace above the bath surface to exothermically produce carbon dioxide.
5 more elements
Dependencies are inferred from the claim text.