JPS57210906A - Reducing method for iron oxide - Google Patents

Abstract

PURPOSE:To remove coke thoroughly and to improve the reducibility of iron by providing fluidized bed zones wherein the combustion of coke, the generation of CO and the reduction of iron oxide are effected respectively independently to a regeneration tower for iron oxide type catalysts for catalytic cracking of asphalt. CONSTITUTION:Part of iron oxide type catalysts stuck with coke are supplied through a pipe 8 into the 1st fluidized bed zone B in the 1st reaction tower 7, and are fluidized by the air supplied through a pipe 9, whereby the coke is burned. The generated CO2 rich gas is delivered in the bottom part of the 2nd fluidized bed zone C. The remaining catalysts stuck with coke are fluidized by the CO2 rich gas from the zone B; at the same time, they cause producer gas reaction, thereby producing gaseous CO. This gas is fed into the bottom part of the 3rd fluidized bed zone D in the 2nd reaction tower 11 through a pipe 10. On the other hand, the catalysts stuck with unreacted coke in the zone C are returned through a downcomer 12 into the zone B, where the coke is burned almost perfectly. Further, the catalysts removed of the coke almost completely in the zones B, C are supplied through a pipe 13 into the zone D, where they are fluidized by the CO through the pipe 10 and are reduced. These catalysts are removed through a pipe 14.