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

US4238222A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Harry Serbent · Hanau, DE
• Gerhard Reuter · Ismaning, DE
• Wolfram Schnabel · Idstein, DE
• Gunter Kossek · Gechingen, DE

Key dates

• Filing date: Jul 20, 1979
• Grant date: Dec 9, 1980
• Expiry date: Jul 20, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a Waelz process of volatilizing zinc and lead from iron-containing and oxide-containing material in an inclined rotary kiln, which is charged at its upper end with the material together with solid carbonaceous reducing agent having a high content of volatile combustible constituents, wherein the reduction and volatilization are effected below the softening point of the charge, metallic iron-containing material is discharged from the lower end of the rotary kiln, combustion air is sucked into the lower end of the rotary kiln, and the exhaust gases are sucked from the upper end, the improvement which comprises blowing oxygen-containing gases through tubular air nozzles into the charge disposed over said tubular air nozzles in that region of the heating-up zone which begins where ignitable particles of the solid reducing agent begin to occur and which terminates at up to 50 percent of the length of the kiln.