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Abstract

The present invention relates to a method for making sponge iron briquettes from fine ore with a maximum grain size of less than 2 mm, preferably less than 0.5 mm, wherein hot fine ore is fed to a roller press comprising two press rolls and is briquetted by opposite briquette pockets of the press rolls in the nip to form sponge iron briquettes. The direct pressing of fine ore into sponge iron briquettes has largely been unknown in the prior art. The invention proposes that one of the press rolls be operated as a loose roll which is substantially movable in a direction transverse to the roller axis, the nip adapting to the amount of material supplied to the press rolls and the nip substantially having such a mean width that a briquette strip is produced. In comparison with a former method, the method of the invention achieves a markedly increased service life of the molding bodies which are provided with press pockets.

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First Claim