Title

HOT METAL ADJUSTMENT NEW TECHNIQUE DEVELOPMENT BASED ON COHERENT OXYGEN JET

Authorship

Machado, Pedro Augusto David; Sampaio, Ronaldo Santos; Maia, Breno Totti

Machado, Pedro Augusto David

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Sampaio, Ronaldo Santos

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Maia, Breno Totti

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DOI

10.5151/2594-357X-27869

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Abstract

The hot metal produced in small blast furnaces runs with a highly heterogeneous charcoal. The result is a significantly higher hot metal chemical composition variation, especially for the silicon content, which varies from 0.4 to 1.5% in Mini Blast Furnaces - MBFs, designed to feed an EAF and/or a BOF. These MBFs operate with frequent variation in their productivities to feed preferably only one of the steelmaking reactors, that is, EAF or BOF. The hot metal suitable amount, chemical composition and temperature, to be delivered at the steelmaking vessel, become the major concerns in the integrated operation MBF to EAF or BOF. In order to cope with those undesirable frequent variations, a solution has been proposed based on the existing technologies of oxygen jets and ladle refining techniques adapted to a hot metal ladle or to a Torpedo Car. The proposed technique is not only able to adjust hot metal temperature and chemical composition, but it also generates the adequate conditions for refinement from P and S, as well as “cleaning” hot metal ladles and Torpedo Cars by melting pig iron skulls. Therefore, this new technique development results in high hot metal yield, an adequate chemical composition and bigger campaign of hot metal ladle.

Keywords

Hot metal, Mini blast furnace, Ladle, Torpedo car

Torpedo car