PURPOSE: To promote the slag formation of ash content in the settled coke and to prevent the production of metallic iron with unburning carbon by blowing a gas into the slag in a settler of a reduction furnace for smelting zinc or lead through a lance with its tip part dipped into the slag.
CONSTITUTION: In the reduction furnace for smelting the zinc and/or the lead composed of a shaft 1, settler 2 and uptake 3, powdery coke, oxygen and raw material are supplied from each of charging holes 7-9, and the raw materials are reduced with a reducing gas produced by oxidation of coke to recover the zinc, lead, etc., as their metallic vapor. In the operation method of reduction furnace, one or more kinds of nitrogen, air, oxygen-enriched air and industrial oxygen are blown into the slag in the settler 2 through the lance 6 arranged at a setter roof and dipped into the slag 4 at its tip part. By this method, the molten slag is intensely stirred with a little quantity of the gas, and the slag layer and the ash content in the powdery coke or the unburning carbon are uniformly and sufficiently mixed.
UTSUNOMIYA KIMIAKI
FUJITA KEIJI
TAKANO HITOSHI
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