A SLAG FUMING PROCESS FOR PRODUCING CLEANSED SLAG WITH REDUCED CONTENTS OF LEAD AND ARSENIC

摘要

Abstract A slag fuming process wherein a slag containing arsenic or arsenic and antimony together with zinc and lead is heated and reduced in a slag fuming furnace, and zinc and lead are separated by evaporation, characterized in that it comprises causing a copper melt containing copper in an amount being 5 to 100 wt % relative to that of the slag charged in the above furnace and being 100 wt % or more relative to that of the lead contained in the above slag to be co-present in the above slag melt at a temperature of 1075 to 1500°C, and reacting the copper melt with arsenic or arsenic and antimony contained in the slag, to form a Cu-Fe-Pb-As based uniform melt. The above process of slag fuming and the like can be suitably employed for producing, by the use of a slag generated from a smelting furnace for refining zinc and/or lead, a dust containing zinc and lead and being reduced in the contents of arsenic and antimony, and a slag stably satisfying the environmental standard for soil, at a low treatment cost.