Metal refining process
AssigneeBritish Steel Corporation
InventorAdrain S. Normanton
Life of this patent
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Abstract
A process for refining steel by top blowing with below melt tuyere injection in which at the commencement of the refining cycle the refining gas lance is located at a pre-determined height above the melt, and the gas flow rate to the below melt tuyere or tuyeres is set at a predetermined level, comprising the steps of reducing the height of the lance and the gas flow rate to the tuyeres in one or more stages during the course of the refining cycle and increasing the height of the lance and the gas flow rate to the tuyeres towards the end of the refining cycle.
Claims18
In a process for refining steel comprising blowing a refining gas on to the upper surface of a melt contained in a refining vessel by means of an overhead lance, and additionally injecting a stirring or processing gas directly into the melt by means of one or more tuyeres projecting into the melt below the surface thereof, the improvement in which at the commencement of the refining cycle the refining gas lance is located at a predetermined height above the melt, and the gas flow rate to the below melt tuyere or tuyeres is set at a predetermined level, and further characterised by the steps of reducing the height of the lance and the gas flow rate to the one or more tuyeres in one or more stages during the course of the refining cycle, and increasing the height of the lance and the gas flow rate to the tuyere or tuyeres towards the end of the refining cycle.
Dependencies are inferred from the claim text.