Process of calcining limestone or hydrated lime in a rotary kiln

US4220631A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Harry Serbent · Hanau, DE
• Heinz Eichberger · Bad Soden, DE
• Hermann Lommert · Neu-Isenburg, DE
• Herbert Lausch · Frankfurt am Main, DE
• Horst Steinhofel · Neu-Anspach, DE

Key dates

• Filing date: Apr 20, 1978
• Grant date: Sep 2, 1980
• Expiry date: Apr 20, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2/108
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for the calcining of limestone or hydrated lime by thermal treatment thereof with hot gases in an oxidizing atmosphere in a rotary kiln through which the kiln atmosphere and the charge are countercurrently passed, which kiln is fed with fuel from shell burners, is described. The invention resides in the use of different fuels which release different quantities of SO.sub.2 and SO.sub.3 per unit of calorific heat. The fuel which releases the larger quantity of SO.sub.2 or SO.sub.3 per unit value of calorific heat is supplied to the upper portion of the rotary kiln, and the fuel which releases the smaller quantity of SO.sub.2 and SO.sub.3 per unit of calorific heat is supplied to the lower portion of the rotary kiln.