METHOD FOR MANUFACTURING ZINC OXIDE CALCINE OR ZINC OXIDE BRIQUETTE

摘要

PROBLEM TO BE SOLVED: To provide a method achieving the suppression of the growth of depositions to the inner wall of a rotary kiln while depending on the content of a water content in a zinc oxide cake.

SOLUTION: Regarding the method for manufacturing a zinc oxide calcine or a zinc oxide briquette comprising: a step where zinc-containing steel dust is charged to a reduction roasting furnace together with a reducing agent, so as to be reduced; a step where crude zinc oxide recovered from the reduction roasting furnace is subjected to wet treatment; a step where the obtained zinc oxide slurry is subjected to dewatering treatment; and a step where the obtained zinc oxide cake is charged to a drying heating furnace and is fired. In the step where the zinc oxide cake is charged to the drying heating furnace and is fired, when the zinc oxide cake is charged to a rotary kiln via a screw conveyer, and the zinc oxide is dried, water is poured into the zinc oxide cake inside the screw conveyer through which it is fed to the rotary kiln according to necessary.

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