Process of producing quicklime by calcining in a rotary kiln

US4368177A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Wolfram Schnabel · Idstein, DE
• Gerhard Reuter · Ismaning, DE
• Herbert Lausch · Frankfurt am Main, DE

Key dates

• Filing date: Apr 2, 1981
• Grant date: Jan 11, 1983
• Expiry date: Apr 2, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/40
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process is disclosed for producing quicklime by a calcining treatment with a hot gas in a rotary kiln, wherein solid carbonaceous fuel for producing hot gas is fed into the charging end of the rotary kiln and an oxygen-containing gas is blown through nozzle blocks into the charge disposed over nozzle blocks in the heating-up zone beginning at the point where ignitable particles of the solid fuel first appear, the improvement wherein: PA1 (a) an oxygen-containing gas is blown through nozzle blocks into the charge disposed over nozzle blocks in that region of the heating-up zone which begins with the appearance of ignitable particles of the solid fuels and which ends where the temperature in the charge does not rise further; PA1 (b) oxygen-containing gases are blown through nozzle blocks into the charge disposed over nozzle blocks in a calcining zone which succeeds said heating-up zone and at such a rate that the temperature in the charge is held constant and for as long as the temperature remains constant, PA1 (c) oxygen-containing gases are blown into the free kiln space where the kiln atmosphere contains combustible gaseous constituents, and PA1 (d) the rates at which oxygen-con…