Process of producing briquettes to be charged to zinc-producing shaft furnaces

US4525207A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventor

• Dirk Hankel · Mühlheim, DE

Key dates

• Filing date: Jan 13, 1984
• Grant date: Jun 25, 1985
• Expiry date: Jan 13, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22B1/24
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Calcine which has been obtained by roasting in a fluidized bed and contains zinc oxide is briquetted at elevated temperatures. To produce briquettes having desirable properties for processing in a zinc-producing shaft furnace, the calcine is provided with metallic lead and/or lead oxide in an amount corresponding to at least 3% lead, non-caking coal having a low content of volatile constituents is admixed to the calcine, the Pb:C weight ratio is adjusted to at least 1, and the mixture is briquetted at a compacting temperature of 250.degree. to 470.degree. C. and under an applied pressure amounting to 4 to 20 metric tons per centimeter or roll width when said pressure is dynamically measured.