| 摘要 |
PURPOSE:To stabilize behaviour balance of powder in fluidized layer, and to prevent mixing of impurity in carbon powder, by controlling grain size ranges of Cr ore fines and solid carbon powder so that they are not overlapped, in preliminary reduction of Cr ore by fluidized layer. CONSTITUTION:Or ore fines and coal fines are charged to a fluidized bed 1 of reducing apparatus from supplying sources 2, 3 respectively, and counter current gas is supplied from under. Recovered gas is cleaned by a gas treating means 6 provided in circulation passage of counter current gas, and deficinet quantity thereof is supplied from source of gas such as steam, CH4 through a heater 7. The bed 1 is held to reducing temp. of Cr ore by a heating means 8. Thereat, overlapping of respective grain size ranges of Cr ore fines and coal fines is prevented. In such a way, Cr ore fines is reduced, the reduced part is passed through a slanted sieve 9 to sieve unburnt coal fines and ash without passing them therethrough, reduced Cr fines part is recovered, and sent to the following process by a carrying means 13.
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