Process of hot briquetting granular sponge iron

C - Chemistry – Metallurgy – 21 – B

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C21B 13/00 (2006.01) C22B 1/24 (2006.01)

Patent

CA 2238383

The granular sponge iron is fed into a roller press at temperatures of 600-850 °C to form hat briquets. A strip structure is thereby formed from sponge iron with ausformed hot briquets separated from one another by gaps. The strip structure is smashed to isolate the hot briquets, during this operation fragments of strip structure are produced. The hot briquets and at least some of the fragments are cooled to between 20 and 400 °C and the cooled briquets and fragments are led through a revolving drum. Inside the latter, fine-grained abrasion material is produced from the briquets and fragments. This is then separated from the briquets and fragments since it is pyrophorous.

L'éponge de fer granuleuse est alimentée dans une presse à rouleaux à des températures comprises entre 600 et 850 DEG C pour former des briquettes chaudes. On produit une structure en forme de bande en éponge de fer avec des briquettes chaudes ausformées, placées à une certaine distance les unes des autres. En fracassant la structure en forme de bande, on sépare les briquettes chaudes les unes des autres en produisant des fragments de ladite structure. Les briquettes chaudes et au moins une partie des fragments sont refroidies à des températures comprises entre 20 et 400 DEG C puis, une fois refroidies, elles sont acheminées vers un tambour rotatif dans lequel les briquettes et fragments produisent des particules abrasées à fine granulométrie. Ces particules abrasées sont finalement séparées des briquettes et des fragments car elles sont pyrophores.

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