Method of reprocessing zinc- and iron oxide-containing...

Details Method of reprocessing zinc- and iron oxide-containing... Method of reprocessing zinc- and iron oxide-containing...

C - Chemistry, Metallurgy

22

B

C22B 7/02 (2006.01) C22B 5/14 (2006.01) C22B 19/04 (2006.01) C22B 19/28 (2006.01) C22B 19/30 (2006.01)

Patent

CA 2175742

This invention describes a method of reproces- sing zinc- and iron oxide-containing residual material. Zinc- and iron oxide-containing dust and/or sludge is gra- nulated with water, granules and carbonaceous material are fed to a circulating fluidized bed system, the gas-solids suspension circulated in the circulating fluidized bed system is fed to a second fluidized bed reactor, the solids discharged from the second fluidized bed reactor are recyc- led to the reactor of the circulating fluidized bed system, 50 to 75% by volume of the oxygen required to gasify the carbonaceous material are fed as fluidizing gas to the reac- tor of the circulating fluidized bed system and 25 to 50% by volume of said required oxygen are fed as a fluidizing gas and secondary gas to the second fluidized bed reactor, iron oxide-containing material is discharged from the reactor of the circulating fluidized bed system and zinc-containing material is discharged with the exhaust gas from the circu- lating fluidized bed system.

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