Influence of TiO2 addition on the structure and metallurgical properties of coke

Cokes were produced in an electrical furnace from a coal blend containing varying levels of added TiO 2 . The effects of TiO 2 levels on coke structure and properties were then considered. Mercury intrusion porosimetry analysis showed that, at increasing TiO 2 addition, macropore level increased but...

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Bibliographic Details
Published in:International journal of coal preparation and utilization 2021-07, Vol.41 (7), p.521-537
Main Authors: Qiu, Shuxing, Zhang, Shengfu, Zhu, Rongjin, Wu, Yue, Qiu, Guibao, Dang, Jie, Wen, Liangying, Hu, Meilong, Bai, Chenguang
Format: Article
Language:English
Subjects:
Aromatic compounds
Carbon
Coke
Coke fired furnaces
Crystallites
Crystals
Fourier analysis
Fourier transforms
Functional groups
Gasification
Infrared analysis
Infrared spectroscopy
Mechanical properties
Mercury
Metallurgical coke
metallurgical properties
Porosity
structure characteristics
Thermal properties
Thermodynamic properties
TiO
Titanium dioxide
X-ray diffraction
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Summary:Cokes were produced in an electrical furnace from a coal blend containing varying levels of added TiO 2 . The effects of TiO 2 levels on coke structure and properties were then considered. Mercury intrusion porosimetry analysis showed that, at increasing TiO 2 addition, macropore level increased but mesopores level decreased. In part because of these changes in pore properties, coke mechanical strength decreased but its strength after gasification improved up to a TiO 2 addition of about 1% and then deteriorated slightly. X-ray diffraction analysis indicated that average stacking heights and lateral size of layer structures varied with TiO 2 addition levels. Crystallites volume was determined through assuming a cylindrical carbon structure with multiple multi-aromatic rings arranged in parallel. A logarithmic relationship was found to exist between this parameter and coke thermal properties. Fourier transform infrared spectroscopy analysis showed a strong linear correlation between the coke reactivity, coke strength after reaction, and C = O content in the oxygen functional groups. It was concluded from this study that added TiO 2 decreased the proportion of carbon active sites in the coke because of increasing carbon crystallites volume and decreasing C = O functional groups, and this resulted in decreased reactivity during gasification and increased coke strength after gasification.
ISSN:1939-2699
1939-2702
DOI:10.1080/19392699.2018.1496913