Direct smelting process and apparatus

Details Direct smelting process and apparatus Direct smelting process and apparatus

2005-09-06

2005-09-06

Andrews, Melvyn (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

C075S502000, C075S532000, C266S225000

Reexamination Certificate

active

06939391

ABSTRACT:
A molten bath-based direct smelting process for producing ferrous metal from a ferrous feed material is disclosed. The process is characterised by injecting pro-heated air downwardly into metallurgical vessel at an angle of 20 to 90° C. relative to a horizontal axis and at a temperature of 800-1400 ° C. and at a velocity of 200-600 m/s via at least one lance (27) . This step forces molten material in the region of a lower end of the lance away from the lance and forming a “free”space around the lower end of the lance that has a concentration of molten material that is lower than the molten material concentration in the raised bath. The process is further characterised in that the lance is located so that: (i) the lance extends into the vessel a distance that is at least the outer diameter of he lover end of the lance; and (ii) the lower end of the lance is at least 3 times the outer diameter of the lower end of the lance above a quiescent surface of the molt bath.

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