Voest-alpine Industrieanlagenbau Gmbh

Brifer International Ltd.

Roy Hubert Whipp, Jr

Leopold Werner Kepplinger

Konstantin Milionis

Siegfried Zeller

Johannes Leopold Schenk

Gerhard Cip

Gero Tessmer

Karl-Heinz Zimmerbauer

Johann Zirngast

Rudolf Weidinger

Ernst Oberndorfer

Johann Reidetschl&auml;ger

Werner Leopold Kepplinger

Felix Wallner

Karl Czermak

Johann Reidetschlager

Gottfried Rossmann

Gunter Peer

Roland Fluch

Gerald Kern

Roland Sachsenhofer

Sadat Morteza Guscheh

Anton Himmel

In a process for the direct reduction of particulate iron-oxide-containing material by fluidization, a synthesis gas is introduced as a reducing gas into several fluidized bed zones consecutively arranged in series. The reducing gas is conducted from one fluidized bed zone to another fluidized bed zone in counterflow to a flow of particulate iron-oxide containing material through the fluidized bed zones. In order to reduce operating costs and, in particular, the energy demand, various process parameters are varied according to the temperature of the iron-oxide-containing material in the first fluidized bed zone being adjusted to be below 400&deg; C. (and, preferably, below 350&deg; C.), above 580&deg; C. (and preferably about 650&deg; C.), or to a temperature within the range of from 400&deg; C. to 580&deg; C. If the temperature of the iron-oxide-containing material in the first fluidized bed zone is maintained to be below 400&deg; C., the temperature of the iron-oxide-containing material in the following fluidized bed zone is passed through the temperature range between 400&deg; C. and 580&deg; C. within a period of 10 minutes and, preferably, within 5 minutes. If the temperature of the iron-oxide-containing material in the first fluidized bed zone is adjusted to a temperature above 580&deg; C., the temperature range of between 400&deg; C. and 580&deg; C. in the first fluidized bed zone is passed through within a maximum period of time of 10 minutes and, preferably, 5 minutes. If the temperature of the iron-oxide-containing material in the first fluidized bed zone is adjusted to be within the range of from 400&deg; C. to 580&deg; C., the iron-oxide-containing material remains in the first fluidized bed zone within that temperature range for a maximum of 10 minutes and, preferably, 5 minutes, and the material is then passed on into the following fluidized bed zone immediately after having reached the desired temperature.

Plant for the direct reduction of particulate iron-oxide-containing material

A process for the direct reduction of particulate iron-oxide-containing material by fluidization. A synthesis gas is introduced as a reducing gas into several fluidized bed zones consecutively arranged in series for the reducing gas. The reducing gas is conducted from one fluidized bed zone to another fluidized bed zone in counterflow to the particulate iron-oxide containing material. In order to reduce operating costs and, in particular, the energy demand, the temperature of the iron-oxide-containing material is adjusted in the first fluidized bed zone to be either below 400&deg; C. (and, preferably, below 350&deg; C.), or above 580&deg; C. (and preferably about 650&deg; C.), or to a temperature ranging from 400&deg; C. to 580&deg; C. If the temperature of the iron-oxide-containing material in the first fluidized bed zone is adjusted to be below 400&deg; C., the temperature range in the following fluidized bed zone between 400&deg; C. and 580&deg; C. is passed through within a period of 10 minutes and, preferably, within 5 minutes. If the temperature of the iron-oxide-containing material in the first fluidized bed zone is adjusted to be above 580&deg; C., the temperature range in the first fluidized bed zone between 400&deg; C. and 580&deg; C. is passed through within a period of time of maximally 10 minutes and, preferably, 5 minutes. If the temperature of the iron-oxide-containing material in the first fluidized bed zone is adjusted to be in the range of from 400&deg; C. to 580&deg; C., the iron-oxide-containing material remains within that temperature range for a maximum of 10 minutes and, preferably, 5 minutes, and the material is passed on into the following fluidized bed zone immediately after having reached the desired temperature.

Process and plant for the direct reduction of particulate iron-oxide-containing material

Process for producing sponge iron by direct reduction of

Method and arrangement for cooling hot bulk material

An apparatus for treating fine ore in which fine ore is dried by aid of a hot drying gas flowing around the ore particles. After having flown around the ore particles, the drying gas is purified while releasing entrained dust ore particles. The dust ore particles are collected and admixed to the dried fine ore. In order to avoid process disturbances in the further processing of fine ore due to excessive portions of dust ore particles present without the fine ore, drying is effected in the whirl-bed method under simultaneous wind-screening of the fine ore. The drying gas is passed through the fine ore under formation of a whirl bed and the speed of the drying gas is fixed at a rate at which entraining of dust ore particles having dimensions below a predetermined dimension is effected. The dust ore particles entrained in the drying gas are separated, collected and admixed to the dried fine ore in dosed amounts. The apparatus includes a fine ore whirl-bed drying means including a drying-gas feeding means. A drying-gas purification means receives the hot drying gas from the whirl-bed drying means. A separating means separates from the hot drying gas dust ore particles entrained by the drying gas. A first collecting vessel receives the dust ore particles separated from the hot drying gas. A mixing means mixes the dried fine ore and the dust ore particles separated from the drying gas to a predetermined quantitative ratio.

Apparatus for treating fine ore

Process for reducing oxide-containing material and plant for carrying

Process and plant for the direct reduction of iron-oxide-containing

Process and plant for avoiding metal dusting in the direct reduction of

Direct reduction process for iron oxide-containing materials

Process for the direct reduction of particulate iron-containing material

In a process for treating fine ore, the fine ore is dried by aid of a hot drying gas flowing around the ore particles of the fine ore, the drying gas, after having flown around the ore particles, is purified while releasing entrained dust ore particles and the dust ore particles are collected and admixed to the dried fine ore. In order to avoid process disturbances in the further processing of fine ore due to excessive portions of dust ore particles present within the fine ore,

Method of treating fine ore

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Windermere, FL, United States of America

Roy Hubert Whipp, Jr