Direct reduction of iron oxide containing material with biofuel
OwnerOlle B. Lindstrominventor
Life of this patent
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Abstract
A new method is devised for the production of raw iron or so-called metallized iron ore. Biofuels i.e. preferably fuel wood and/or peat is in the final reduction brought into direct contact with the iron containing material in its solid state. Biofuels have very different properties compared to reduction agents on the basis of fossil fuels primarily coal and develop rapidly a reactive reduction gas at a comparatively low temperature. The new raw iron process is carried out with the iron containing material in its solid state of aggregation in different kinds of fluidized bed reactors in different system configurations.
Claims17
A method for the reduction of an iron oxide-containing material comprising:
- (a) preheating an iron oxide-containing material in a preheating zone;
- (b) passing said preheated iron oxide-containing material to a first reduction zone wherein said material is contacted with a reducing gas under suitable conditions of temperature and pressure to partially reduce said iron oxide in said material;
- (c) passing said material to a second reduction zone wherein said iron oxide is contacted with a finely divided biofuel selected from the group consisting of wood, wood waste, straw, kelp and peat under suitable conditions of temperature and pressure and further reduced while producing a reducing gas, said reducing gas being passed to said first reduction zone;
- and
- (d) recovering the reduced material from said second reduction zone.
Dependencies are inferred from the claim text.