Process for thermally treating solids with high-oxygen gases, especially for pyrometallurgical applications

US4144051A · kind A · utility

Assignees

• Metallgesellschaft AG · DE
• Deutsche Babcock Aktiengesellschaft · DE

Inventors

• Martin Rahn · Frankfurt am Main, DE
• Lothar Reh · Zumikon, CH
• Bernd Thone · Friedberg, DE
• Karel Vydra

Key dates

• Filing date: Aug 11, 1977
• Grant date: Mar 13, 1979
• Expiry date: Aug 11, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22B5/14
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for thermally treating fine-grained solids with high-oxygen gases at temperatures at which the solids can form molten and gaseous reaction products comprises carrying out the thermal treatment in a cyclone chamber and thereafter conducting the gases from the cyclone chamber into a horizontal or vertical cooling chamber. The process can be used for the roasting of sulfide ores, ore concentrates and other metallurgical intermediate products. The outlet of the cyclone chamber through which the gases are removed lies approximately along the axis and cooling is carried out in the cooling chamber such that the molten droplets contained in the gas stream entering the latter are cooled in free flight below their solidification point in the gas, i.e., do not contact the walls of the cooling chamber until they are solidified at least along their surfaces.