Waelz process of volatilizing zinc and lead from iron oxide containing materials

Abstract From the Canadian patent

A waelz process of volatilizing zinc and lead from iron oxide-containing feed material in an inclined rotary kiln, in which pelletized and at least partially dried feed material is charged into the rotary kiln at its upper end together with solid carbonaceous reducing agent volatil-, ization and reduction are effected at a temperature below the softening point of the charge, metallic iron-containing matter is discharged from the lower end of the rotary kiln part of, the discharged matter is separated and is recycled to the feed material before the latter is pelletized the gaseous oxygen, required for combustion is sucked into the lower end of the rotary kiln, and the exhaust gases which …