C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
39/18, 53/30
C22B 1/216 (2006.01) C21B 13/08 (2006.01) F27B 7/00 (2006.01)
Patent
CA 1160848
Abstract A method and means for improving control of the process for directly reducing ores containing iron oxide in a rotary kiln using a solid carbonaceous reducing agent, such as coal, introduced from the ore feed and discharge ends of the kiln, as both fuel and reductant, is disclosed wherein the temperature profile of the moving bed of solids is maintained such that the temperature is moderated to remain below the sintering temperature of the materials in the bed from the feed end zone for about the first two- thirds of the kiln length and the temperature is then maximized within sintering limitations in the working zone which is limited to about the last third of the kiln length. The temperature profile is controlled by regulating the volumes of air supplied to the kiln atmosphere from air injectors at spaced intervals along the length of the kiln, after establishing the appropriate proportion of coal stead- ily blown into the discharge end of the kiln for the par- ticular process constituents being used.
369377
Baker Alan C.
Keran Vitie P.
Direct Reduction Corporation
Swabey Ogilvy Renault
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