Process for preparing binder-free hot-briquets

摘要

The invention relates to a process and an apparatus for preparing binder-free hot-briquets for smelting purposes from ferrous pyrophorous, finely divided solids, such as dry steelmaking-filter dust or slightly granular sponge iron from direct-reduction plants. Before the briquetting stage, oxidizing gas is blown at a temperature of more than 200 DEG C. through the finely divided dry solid containing more than 4% by weight of metallic iron. The flow rate of this gas is controlled in such a way that oxidation of some of the metallic iron raises the temperature of the finely divided solid to 450 DEG to 650 DEG C. This is followed by hot-briquetting.