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Minerals 2017, 7(2), 19; https://doi.org/10.3390/min7020019

Investigation on Calcination Behaviors of Coal Gangue by Fluidized Calcination in Comparison with Static Calcination

1
College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
2
Research Center of Coal Resources Safe Mining and Clean Utilization, Liaoning Technical University, Fuxin 123000, China
*
Authors to whom correspondence should be addressed.
Academic Editor: William Skinner
Received: 12 December 2016 / Revised: 10 February 2017 / Accepted: 10 February 2017 / Published: 14 February 2017
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Abstract

In order to comprehensively utilize coal gangue, we present fluidized calcination as a new thermal technology for activating coal gangue and systematical study was conducted in comparison with static calcination. The calcined products obtained by different calcination methods under various temperatures were characterized by the means of X-ray diffraction (XRD), thermal gravimetry-differential scanning calorimeter (TG-DSC), Fourier transform-infrared spectroscopy (FT-IR) and scanning electron microscope-energy dispersive spectrometer (SEM-EDS). Chemical and physical characteristics such as aluminium leaching rate, chemical oxygen demand and whiteness of calcined products were also investigated. The results show that aluminium leaching rate could reach to the maximal value 74.42% at 500 °C by fluidized calcination, while the maximal value of 66.33% could be reached at 600 °C by static calcination. Products by fluidized calcination obtained higher whiteness and lower chemical oxygen demand (COD) under the same calcination temperature. The well-crystallized kaolinite transform to amorphous meta-kaolinite under 600 °C and mullite presence under 1000 °C according to phase transformation, chemical bond variation and microstructure evolution analysis. Fluidized calcination was more efficiently for combustion of carbon/organic matter and dehydroxylation of kaolinite, which might applied in coal gangue industry in future. View Full-Text
Keywords: coal gangue; fluidized calcination; static calcination; thermodynamic characteristics; transformation behaviors coal gangue; fluidized calcination; static calcination; thermodynamic characteristics; transformation behaviors
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Yuan, S.; Li, Y.; Han, Y.; Gao, P.; Gong, G. Investigation on Calcination Behaviors of Coal Gangue by Fluidized Calcination in Comparison with Static Calcination. Minerals 2017, 7, 19.

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