Process and apparatus for heat-treating fluidized solids

摘要: Finely divided solids are heated in a process wherein part of said is passed successively through at least three fluidized beds comprising preheating zone, heating zone and final treatment the remaining portion directly from to zone: heat supplied greater than that required by solid which has thereto zone. The described with reference haematite form magnetite reduction stage. A gas 1100 DEG C. H2, CO, CH4 diluents was into stage had temperature 650 whilst 800 220 C.; 54.3 per cent bypassed In illustrated embodiment, two portions 30 31 means partition 26, each separately ore. ore preheated gases rising grid 21 B bed An inlet pipe 60 supplies air or upper chamber 45, whereby combustible reducing passing C burnt 40. 40 45 together cooler there mix. proportions entering zones arranged give suitable for reduction, may be so placed cross-sectional areas correspond these proportions; depths then maintained substantially equal.