Study on Al2O3 Extraction From Activated Coal Gangue under Different Calcination Atmospheres

Coal gangue was calcinated under air, nitrogen, carbon dioxide, air-hydrogen, and hydrogen atmospheres. The effects of different calcination temperatures and atmospheres on the mineral composition of activated coal gangue were investigated by X-ray diffraction. Moreover, the acid leaching kinetics o...

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Bibliographic Details
Published in:Journal of thermal science 2017-12, Vol.26 (6), p.570-576
Main Authors: Dong, Ling, Liang, Xinxing, Song, Qiang, Gao, Gewu, Song, Lihua, Shu, Yuanfeng, Shu, Xinqian
Format: Article
Language:English
Subjects:
Acid leaching
Activated clay
Aluminum oxide
Atmospheres
Carbon dioxide
Chemical reactions
Classical and Continuum Physics
Coal
Decomposition reactions
Engineering Fluid Dynamics
Engineering Thermodynamics
Gangue
Heat and Mass Transfer
Hydrogen
Kaolinite
Kinetic equations
Leaching
Physics
Physics and Astronomy
Reaction kinetics
Roasting
Shrinking core model
Sulfuric acid
Sulfuric acid leaching
二氧化碳
反应动力学方程
提取
氧化铝
焙烧温度
煤矸石
空气气氛
表观活化能
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Summary:Coal gangue was calcinated under air, nitrogen, carbon dioxide, air-hydrogen, and hydrogen atmospheres. The effects of different calcination temperatures and atmospheres on the mineral composition of activated coal gangue were investigated by X-ray diffraction. Moreover, the acid leaching kinetics of aluminum oxide from coal gangue was investigated with sulfuric acid. It showed that the air atmosphere promoted kaolinite decomposition during coal gangue calcination. The hydrogen atmosphere promoted the activation and decomposition of kaolinite at reaction temperatures exceeding 650℃. The carbon dioxide atmosphere eliminated the influence of residual carbon on coal gangue. When the ratio of acid/coal gangue was 1.5 and reaction temperature was 650℃, the sulfuric acid leaching rate under air, air-hydrogen, carbon dioxide, hydrogen and nitrogen atmospheres were 93.66%, 90.90%, 84.06%, 81.91% and 77.54% respectively. The acid leaching reaction process conformed to unreacted shrinking core model of particle unchanged, and was controlled by the interracial chemical reaction. The reaction kinetic equation for the leaching process was 1-（1-x）1/3=kt with an apparent activation energy of 48.97 kJ/mol.
ISSN:1003-2169
1993-033X
DOI:10.1007/s11630-017-0975-y