C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/28
C22B 1/00 (2006.01) C21B 13/00 (2006.01)
Patent
CA 1078622
Inventor: PER HARALD COLLIN Title: METHOD FOR REDUCTION IN A FLUID BED OF FINE GRAINED MATERIAL CONTAINING IRON OXIDE. Abstract: A method in connection with reduction of fine grained, iron oxide containing material in a fluid bed for manufacturing a low-sulphurous fine, grained mixture of partly reduced, iron oxide containing material and coke by the use of solid and possible liquid carbonaceous materials containing sulphur, wherein: a continuous fluid bed is maintained at 800 to 1200°C in a suitable apparatus by introducing into said apparatus adjusted flows of fine grained solid carbonaceous material and possibly liquid carbonaceous material, fine grained material containing iron oxide and fine grained material containing CaO and/or CaCO3 and a reducing gas for fluidization, the material containing iron oxide is introduced within the limited zones around the inlets for the solid carbonaceous material where the volatile constituents of said carbonaceous material are expelled and partly gasified and coked, while the material containing CaO/CaCO3 is introduced outside said zones; bed material is tapped from the bed at such an adjusted flow that the amount of bed material remains constant, and wherein the tapped material is cooled below the Curie-point of iron and subsequently is magnetically separated into a magnetic low- -sulphurous fraction mainly containing partly reduced, iron oxide containing material, coke and ashes and a non-magnetic fraction mainly comprising CaO/CaS-containing material and coke, the non-magnetic fraction being re-cycled after expuls- ion of its sulphur content. - 1 -
246922
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