Other

Research Institute of Industrial Science & Technology

Voest-alpine Industrieanlagenbau Gmbh

Pohang Iron & Steel Co. Ltd.

Il-Ock Lee

Werner Leopold Kepplinger

Felix Wallner

Yong-Ha Kim

Johannes Leopold Schenk

Franz Hauzenberger

Johannes-Leopold Schenk

Udo Gennari

Moon Duk Park

Johannes-Leopold Schnek

Gyu-Dae Park

In the process for the production of liquid pig iron ) or liquid steel pre-products from charging substances comprising iron ore ( ) and fluxes and at least partially containing a portion of fines, the iron ore is directly reduced to sponge iron in at least two reduction stages ( ) by the fluidized bed method, the sponge iron is melted in a melt-down gasifying zone ( ) under the supply of carbon carriers and an oxygen-containing gas, and a CO- and H -containing reducing gas is produced which is injected into reduction zones of the reduction stages ( ), is reacted there, is withdrawn as a top gas and optionally is supplied to a consumer. To achieve uniform reduction of the iron ore at optimum exploitation of the reducing gas, the iron ore ( ) in a first reduction stage ( ) by aid of the reducing gas is fractionated into at least two fractions having different grain size distributions each, each fraction is reduced by the reducing gas in a separate fluidized bed ( ), wherein the reducing gas maintains a first fluidized bed ( ) containing the coarse-grain fraction and separates the fine-grain fraction from the same, and wherein, further, reducing gas is additionally introduced into the further fluidized bed ( ) directly reduced iron ore ( ) is discharged both from the first and from the further fluidized bed ( ) and the fine- and the coarse-grain fraction reduced in the first reduction stage ( ) are further reduced in at least one further reduction stage ( ) operating in the same manner as the first reduction stage ( ) and from the last reduction stage ( ) the fine-grain fraction is introduced into the melt-down gasifying zone ( ) while being agglomerated by provision of oxygen, and the coarse-grain fraction is fed directly into the melt-down gasifying zone ( ) gravitationally (FIG. 1).

Process for the production of liquid pig iron or liquid steel pre-products

In a method for treating particulate material in the fluidized bed method, the particulate material is maintained in a fluidized bed by a treating gas flowing from bottom to top and thereby is treated. To minimize the consumption of treating gas and to reduce entrainment of fine particles by the treating gas, a particulate material having a wide grain distribution and a relatively high portion of fines is used for treatment and the treating gas in the fluidized bed is maintained at a superficial velocity less than the velocity required for fluidizing the largest particles of said particulate material.

Method for treating particulate material in the fluidized bed method and vessel and plant for carrying out the method

Process for reducing ore fines and arrangement for carrying out the

Growing community of inventors

Pohang, South Korea

Il-Ock Lee