Metallgesellschaft Aktiengesellschaft

Horst Steinhofel

Harry Serbent

Heinz Eichberger

Werner Kaas

Herbert Lausch

Hermann Lommert

Justus Kuhn, Deceased

An improved process for briquetting sponge iron-containing material wherein as binder there is employed dilute sulfuric acid and the sponge iron-containing material contains at least 40% by weight metallic iron.

Process of briquetting sponge iron-containing material

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.

Process of calcining limestone or hydrated lime in a rotary kiln

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Neu-Anspach, Germany

Horst Steinhofel