2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 3: Takano Intl. Symp. / Metals & Alloys Processing
| Editors: | Kongoli F, Noldin JH, Mourao MB, Tschiptschin AP, D'Abreu JC |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 550 pages |
| ISBN: | 978-1-987820-26-3 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Direct Reduction of Iron: A Review on Midrex and Hyl Patents
Tiago Ribeiro1; Joao Batista Ferreira Neto1; Cyro Takano2; Joao Poco3;1INSTITUTE FOR TECHNOLOGICAL RESEARCH, Sao Paulo, Brazil; 2UNIVERSITY OF SAO PAULO, Sao Paulo, Brazil; 3UNIVERSITY CENTER OF FEI, Sao Bernardo do Campo, Brazil;
Type of Paper: Regular
Id Paper: 169
Topic: 3
Abstract:
Ironmaking is the major energy consuming and CO2-emmiting step in steel production. Direct reduction processes are an alternative to the traditional blast furnace because of the use of H2 in the reducing gases which generate less CO2. There are two main technologies for direct reduction of iron, Midrex and Energiron (or Hyl) which together are responsible for 80% of the production of direct reduced iron in the world. A review on the patents published by the two companies was performed in this work and it was possible to describe the functioning of both process, the developments over the years and to distinguish the differences. Both process are based on shaft furnaces where reducing gases flow in countercurrent to iron ore pellets heating them and reducing iron. The reducing gases are generated by catalytic reforming of methane. The reforming in Midrex is mainly by reaction with CO2 and in Energiron with H2O. There is a newer process version without a reformer, the Energiron Zero Reformer (ZR). In this process, natural gas is injected together with CO2 and H2O in the reduction reactor and the recently reduced iron works as catalyst for reforming reactions. The heat balance is compensated by the injection of oxygen that partially burns the combustible gases.
Keywords:
Furnace; Iron; Process; Technology;References:
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