Method for the pretreatment of a lumpy carbon carrier

Details Method for the pretreatment of a lumpy carbon carrier Method for the pretreatment of a lumpy carbon carrier

1988-11-02

1991-02-26

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75448, 75450, 266160, 266172, C21B 1100

Patent

active

049959042

ABSTRACT:
A method is disclosed for pretreatment of a lumpy carbon carrier suitable for forming a fluidized bed and a solid bed used in the production of pig iron from iron ore. The ore is pre-reduced in at least one reduction plant and the thus produced iron sponge is subsequently final reduced and fused in a melt-down gasifier with the help of the lumpy carbon carrier and an oxygen-containing gas and is the carbon carrier is fed into the upper part and the oxygen-containing gas is fed into the lower part of the melt-down gasifier. These materials form, together with the iron sponge, a fluidized bed in the melt-down gasifier. Below the fluidized bed, a solid bed is formed consisting of said lumpy carbon carrier. A suitable carbon carrier may be formed by pretreating available coal by one of two methods. Lumpy coal tending to burst upon subjection to a shock-like thermal load is preheated for a minimum of one hour at a temperature of at least 300.degree. C. prior to being fed into the melt-down gasifier in order to diminish its bursting tendency and to reduce the thermal load to which it is subjected. Ground fine coal is blended with a binder and granulated into lumps.

REFERENCES:
patent: 4007034 (1977-02-01), Hartwig et al.
patent: 4678508 (1987-07-01), Saeki et al.
patent: 4701214 (1987-10-01), Kaneko et al.
patent: 4734165 (1988-03-01), Bauer et al.
patent: 4805880 (1989-02-01), Hauk

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