FREMGANGSMAATE OG ANORDNING FOR REDUKSJON AV OKSYDMATERIALE

摘要

The invention relates to a method and a plant for reducing oxidic material. A reduction gas (18) is produced containing mainly carbon monoxide and hydrogen from carbonaceous or hydrocarbon- containing material by means of thermal energy from at least one plasma generator (10) in a separate gas-generating shaft (11). The reduction gas thus produced, after optional sulphur separation (22) and after temperature adjustment, is conducted to a reduction shaft (1) containing the oxidic material. The partially spent reduction gas (4) withdrawn from the shaft is freed from water and dust-like particles (5), after which a part-flow of the return-gas is returned to the process and a small part-flow of the return gas is removed from the system (at 6) for pressure regulation. A small part-flow of said partially spent gas intended for re-use in the process is caused to pass through a CO2 scrubber (23) and is then used to adjust the H2/CO ratio in the final reduction gas.