The Effect of Metallic Iron Particle on Coke-Matrix after Coke CO2 Gasification Reaction

The residue of Inner Mongolia lignite semi-coke by different final temperature hydrogenation system methane of CO2 gasification reactivity is studied by means of thermo gravimetric and X-Ray Diffraction method. The results show that, with the rise of hydrogasification temperature, the residue aromaticity fa increase, the residual carbon microcrystalline tend to graphitization, CO2 reactivity decrease and residue CO2 reaction temperature raise. The final hydrogenation temperature residue CO2 gasification reaction conversion rate curves similar and curve to temperature increase in the direction of movement.

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Mechanism Research on Niobium Distribution Influenced by Roasting Temperature in the Direct Reduction Roasting Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.3416 ◽

2013 ◽

Vol 634-638 ◽

pp. 3416-3422

Author(s):

Man Jiang ◽

Ti Chang Sun ◽

Na Liu ◽

Jue Kou ◽

Ya Na Ji ◽

...

Keyword(s):

Metallic Iron ◽

Direct Reduction ◽

Energy Dispersive Spectrometer ◽

Iron Particle ◽

Reduction Roasting ◽

X Ray Diffraction ◽

Iron Concentrate ◽

Roasting Process ◽

Mechanism Research ◽

Roasting Temperature

In this study, the niobium enrichment research of the iron concentrate containing niobium was studied by coal-based direct reduction roasting followed by magnetic separation process. The distribution of niobium element and existence form of mineral bearing-Nb in roasted products were investigated under different roasting temperature which was ranging from 1100°C to 1300°C. X-ray diffraction analysis (XRD) was used to identify the various minerals and compositions of the roasted products. The microstructures of these products were analyzed by the scanning electron microscope (SEM), while the elemental analysis was carried out by using energy dispersive spectrometer (EDS) technique. The results of XRD and EDS analysis showed that most of the niobium minerals were Nb-Fe rutile and ulvospinel which scattered in slag, and only a little was adhered to the surface of metallic iron at 1100°C. And the niobium oxides were partly reduced to Ti-aeschynite and niobocarbide which attached on the surface of metallic iron, and most were still ulvospinel scattering in the slag at 1200°C. The Ti-aeschynite was gradually reduced to Nb adhering to the metallic iron particle forming Nb-Fe soild solution at 1300°C.

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Effect of CO2 gasification reaction on oxy-combustion of pulverized coal char

Proceedings of the Combustion Institute ◽

10.1016/j.proci.2010.07.087 ◽

2011 ◽

Vol 33 (2) ◽

pp. 1699-1706 ◽

Cited By ~ 113

Author(s):

Ethan S. Hecht ◽

Christopher R. Shaddix ◽

Alejandro Molina ◽

Brian S. Haynes

Keyword(s):

Coal Char ◽

Pulverized Coal ◽

Co2 Gasification ◽

Gasification Reaction

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Unific Estimation by Maceral on CO2 Gasification Reaction Rate of Demineralized Coal.

Journal of the Japan Institute of Energy ◽

10.3775/jie.71.428 ◽

1992 ◽

Vol 71 (6) ◽

pp. 428-435

Author(s):

Tatsumi NISHIJIMA ◽

Hideki ISSHIKI ◽

Shiying LIN ◽

Yoshihiko NINOMIYA ◽

Mitsuho HIRATO ◽

...

Keyword(s):

Reaction Rate ◽

Co2 Gasification ◽

Gasification Reaction

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Kinetic Study of CO2 Gasification of Coal Chars

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.2754 ◽

2012 ◽

Vol 550-553 ◽

pp. 2754-2757

Author(s):

Li Hong Zhao ◽

Xi Jie Chu ◽

Shao Juan Cheng

Keyword(s):

Kinetic Parameters ◽

Rate Control ◽

Atmospheric Pressure ◽

Reaction Rate ◽

Homogeneous Model ◽

Co2 Gasification ◽

Gasification Reactivity ◽

Shrinking Core ◽

Gasification Reaction ◽

Gasification Temperature

The CO2 gasification of three coal chars were investigated for determining the gasification reactivity and the kinetic parameters. Experiments were conducted in a fluidized-bed reactor at temperature of 1173 k, 1273 k and 1373 k at atmospheric pressure. Gasification kinetic parameters of the samples were determined using Homogeneous model and shrinking-core model. It is found that the gasification reaction under chemical-reaction-rate control, the gasification reactivity of coal char are strongly dependent on the rank of coals and gasification temperature. Both models could describe CO2 gasification equally well, these kinetic values are comparable with the reported in the literature for the other chars under chemical control conditions.

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