Metallgesellschaft Aktiengesellschaft

Lurgi Metallurgie Gmbh

Outotec (finland) Oy

Alpaydin Saatci

Martin Hirsch

Andreas Orth

Wolfgang Bresser

Reza Husain

Walter Meichsner

Uwe Harter

Albert Kaune

Erwin Schmidbauer

Katharina Kremmer

Karlheinz Broj

Jan Weckes

Günther BÄHR

An end product containing iron carbide (Fe C) is produced from an intermediate product consisting of granular, directly reduced iron. Said intermediate product is supplied by an iron ore reduction plant and is fed to a carburization reactor. Liquid hydrocarbons are conveyed to the carburization reactor at temperatures of 500 to 900&deg; C., at least part of the granular, directly reduced iron being subjected to a swirling movement. The end product removed from the carburization reactor consists of 5 to 90 wt. % Fe C. A fluidization gas containing methane and hydrogen can be added to the carburization reactor in addition to the hydrocarbons.

Method for producing a mixture of iron carbide and granular, directly reduced iron

In order to effect a reduction and a carburization to form Fe.sub.3 C to the highest possible degree in a relatively short time in an economical process, a treatment in two stages is effected in fluidized beds. The first stage is effected in a circulating fluidized bed system, in which the amount of solids circulated per hour is at least five times the weight of solids contained in the fluidized bed reactor and a major part of the iron content of the charge is pre-reduced. The remaining reduction and the partial or complete conversion to Fe.sub.3 C are effected in the second stage in a conventional fluidized bed. Water is condensed from the exhaust gas from the circulating fluidized bed system and that gas is strengthened by an addition of reducing gases and is reheated to the temperature which is required for the process. A part of the reheated recycle gas is supplied as a fluidizing gas to the conventional fluidized bed and the other part of the recycle gas is supplied as a fluidizing gas to the fluidized bed reactor of the circulating fluidized bed. The exhaust gas from the conventional fluidized bed is supplied as a secondary gas to the fluidized bed reactor of the circulating fluidized bed system.

Process and apparatus for a direct reduction of iron oxide containing

Disclosed is a process for the heat treatment of fine-grained iron ore and for the conversion of the heat-treated iron ore to metallic iron, wherein

Process for the heat treatment of fine-grained iron ore and for the

Process for a direct reduction of iron oxide containing materials to

A zinc- and lead-containing residue from a metallurgical plant is reprocessed by a thermal treatment in a circulating fluidized bed system. A major part of the heat demand is satisfied by a combustion of solid carbonaceous material in the fluidized bed reactor of the circulating fluidized bed system. A reducing fluidizing gas, which is virtually free of free oxygen, is fed to the lower part of the fluidized bed reactor. A solid carbon content of from 5 to 30% is adjusted in the fluidized bed in the lower portion of the fluidized bed reactor, which is supplied in its upper portion with oxygen-containing gases and in which CO.sub.2 is formed only at such a rate that zinc metal is not reoxidized. Substantially all solids are removed in a recycling cyclone from the suspension discharged from the reactor and the removed solids are recycled. The gas is cooled to a temperature at which zinc metal is oxidized to ZnO. The dust-like zinc compounds and lead compounds are removed from the gas.

Method of reprocessing zinc- and lead-containing residues from

Growing community of inventors

Frankfurt am Main, Germany

Alpaydin Saatci