Melting method for an electric ARC furnace with alternative sour

Details Melting method for an electric ARC furnace with alternative sour Melting method for an electric ARC furnace with alternative sour

1996-01-17

1998-09-01

Hoang, Tu B.

Industrial electric heating furnaces

Arc furnace device

Furnace body detail

373 2, 373 22, 373 18, 373 85, 75 1019, 266 47, F27D 100

Patent

active

058020977

ABSTRACT:
Melting method for an electric arc furnace with alternative sources of energy for the melting of iron-based alloys, the electric furnace (10) including tuyeres (13) positioned on the bottom to deliver oxygen, at least one tuyere (15) to deliver coal dust which works in the area of contact between the bath of molten metal (16) and the layer of slag (22), at least one supersonic lance (12) cooperating with a lance (29) to deliver coal dust, these lances (12, 29) having a working position (12c, 29c) in which the supersonic lance (12) is positioned in close proximity to the surface of the molten metal (16) and the lance (29) to deliver coal dust is positioned in the vicinity of the surface of the layer of slag (22), and a plurality of burners (28) positioned on the cooled sidewalls (31) of the furnace (10) and delivering oxygen-based gases and combustible substances, whereby at least two first burners (28) work with the action of one burner supporting the action of the next one, the furnace (10) being charged with one or more charges which provide for a first step of start-up of the melting and a second step of melting, a refining step and a tapping step being included, in which method in the first step of start-up of the melting at least one second burner (28e) collaborates in freeing quickly the path of introduction of the supersonic lance (12) and of the lance (29) to deliver coal dust.

REFERENCES:
patent: 3459867 (1969-08-01), Estes
patent: 3980802 (1976-09-01), Paton et al.
patent: 5329545 (1994-07-01), Dudill et al.
patent: 5444733 (1995-08-01), Coassin et al.

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