Process and device for direct production of steel from iron-containing materials

摘要

Process and device for direct continuous steel production out of iron-containing materials using usual power coals as fuel and reducer. It is provided to carry out the process in a single reaction space comprising a layer of liquid refining metal present under a layer of liquid slag comprising iron-containing materials to be processed and droplets of reduces metal so that an intermediate emulsion layer "slag-gas-metal" is designated in between the said layers. In an upper slag layer fuel is burnt and finely grained iron-containing materials are reduced according to coke-free technology of cast-iron production with carbon content at the level of ~4.5-4.8%; iron oxides and reduced metal droplets are transferred from slag layer into intermediate emulsion layer; iron oxides are decomposed and oxygen is isolated together with oxygen-containing gas supplied to emulsion layer. Refining process proliferates to lower refining layer and carbon oxide isolated during refining stimulates reduction processes in slag layer. Basic structure of the device with single reaction space can be adapted to different technological problems and peculiarities of properties in iron-containing materials processed. The solution proposed permits to obtain steel with carbon content within the limits of 0.2-2.0% and with permissible content of admixtures having specific productivity of the device up to 2.0-2.5 t/m² of bottom per hour and productivity of a single unit equal to 50,000-5000 000 t/year.