scholarly journals Influence of Combined Water in Coal on Pre-reduction of Iron Oxide with Coal Carbonization Gas in Low, Middle and High Volatile Matter Coal

2009 ◽  
Vol 35 (1) ◽  
pp. 26-32 ◽  
Author(s):  
Noriyoshi INOUE ◽  
Tateo USUI
Keyword(s):  
Iron Oxide ◽  
Volatile Matter ◽  
Reduction Of Iron

scholarly journals Devolatilization Kinetics of Different Types of Bio-Coals Using Thermogravimetric Analysis

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 168 ◽  
Author(s):  
Asmaa A. El-Tawil ◽  
Lena Sundqvist Ökvist ◽  
Hesham M. Ahmed ◽  
Bo Björkman
Keyword(s):  
Iron Oxide ◽  
Inert Atmosphere ◽  
Volatile Matter ◽  
Conversion Degree ◽  
Heating Rates ◽  
Metal Quality ◽  
Reduction Of Iron ◽  
Thermogravimetric Data ◽  
Lower Temperature ◽  
Reducing Gases

The interest of the steel industry in utilizing bio-coal (pre-treated biomass) as CO2-neutral carbon in iron-making is increasing due to the need to reduce fossil CO2 emission. In order to select a suitable bio-coal to be contained in agglomerates with iron oxide, the current study aims at investigating the thermal devolatilization of different bio-coals. A thermogravimetric analyzer (TGA) equipped with a quadrupole mass spectrometer (QMS) was used to monitor the weight loss and off-gases during non-isothermal tests with bio-coals having different contents of volatile matter. The samples were heated in an inert atmosphere to 1200 °C at three different heating rates: 5, 10, and 15 °C/min. H2, CO, and hydrocarbons that may contribute to the reduction of iron oxide if contained in the self-reducing composite were detected by QMS. To explore the devolatilization behavior for different materials, the thermogravimetric data were evaluated by using the Kissinger– Akahira–Sonuse (KAS) iso-conversional model. The activation energy was determined as a function of the conversion degree. Bio-coals with both low and high volatile content could produce reducing gases that can contribute to the reduction of iron oxide in bio-agglomerates and hot metal quality in the sustained blast furnace process. However, bio-coals containing significant amounts of CaO and K2O enhanced the devolatilization and released the volatiles at lower temperature.

scholarly journals Effect of Residual Volatile Matter on Reduction of Iron Oxide in Semi-charcoal Composite Pellets

2010 ◽  
Vol 50 (3) ◽  
pp. 386-389 ◽  
Author(s):  
Hirokazu Konishi ◽  
Kazuhira Ichikawa ◽  
Tateo Usui
Keyword(s):  
Iron Oxide ◽  
Volatile Matter ◽  
Reduction Of Iron ◽  
Composite Pellets

THE REDUCTION OF IRON OXIDE BY BACTERIA

1954 ◽  
Vol 5 (1) ◽  
pp. 129-139 ◽  
Author(s):  
S. M. BROMFIELD
Keyword(s):  
Iron Oxide ◽  
Reduction Of Iron
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