Reduction of Iron Ore Fines with CO-rich Gases under Pressurized Fluidized Bed Conditions

Pressurized fluidized bed processes for the reduction of iron ore fines using CO-rich reducing gas formed by coal gasification are an upcoming ironmaking technology. They operate in a continuous multi-staged countercurrent mode at an absolute pressure of 4 bar. For process optimization, a laboratory...

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Bibliographic Details
Published in:	ISIJ International Vol. 47; no. 2; pp. 217 - 225
Main Authors:	Pawlik, Christoph, Schuster, Stefan, Eder, Norbert, Winter, Franz, Mali, Heinrich, Fischer, Harald, Schenk, Johannes L.
Format:	Journal Article
Language:	English
Published:	Tokyo The Iron and Steel Institute of Japan 2007 Iron and Steel Institute of Japan
Subjects:	Applied sciences CO-rich reducing gas differential reactor Exact sciences and technology iron ore reduction Metals. Metallurgy morphology porosity pressurized fluidized bed Chemical reduction iron ore reduction pressurized fluidized bed Morphology Porosity differential reactor CO-rich reducing gas Iron ore Fluidized bed
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Summary:	Pressurized fluidized bed processes for the reduction of iron ore fines using CO-rich reducing gas formed by coal gasification are an upcoming ironmaking technology. They operate in a continuous multi-staged countercurrent mode at an absolute pressure of 4 bar. For process optimization, a laboratory-scale pressurized fluidized bed reactor was built to perform experiments similar to industrial conditions. The reactor is operated as a differential reactor to ensure a constant gas concentration and temperature within the reactor volume. Three-stage experiments with three different iron ores were carried out at an absolute pressure of 4 bar in batch-wise operation. The reducing gas consisted of a mixture of H2, H2O, CH4, CO2 and CO. The CO-concentration was varied in a range between 30% and 50%, the residence time in pre-reduction between 30 and 60 min and the operating temperature from 400°C to 850°C. In correspondence to the tests, microscopic techniques were applied to determine the importance of morphological properties of the ores on their reduction behavior. A higher temperature in the pre-reduction stage causes an increase of porosity as well as an increase of the final reduction degree. Comparing different ore types, a significant correlation between the morphology of the employed ores and the final reduction degree was found.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0915-1559 1347-5460
DOI:	10.2355/isijinternational.47.217