Leaching of aluminum from coal spoil by mechanothermal activation

doi:10.1007/s11705-015-1518-2

Front. Chem. Sci. Eng.

2015, Vol. 9

Issue (2) : 216-223 https://doi.org/10.1007/s11705-015-1518-2

RESEARCH ARTICLE

Leaching of aluminum from coal spoil by mechanothermal activation

Xiaoxue SUN,Yuzhu SUN(

),Jianguo YU(

)

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

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Abstract

The process of activating coal spoil (CS) in order to recover aluminum as a high value product was investigated. The CS was first characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD) and thermogravimetric analysis-differential scanning calorimetry (TGA-DSC) in order to determine the chemical and mineral compositions of the CS. Then a mechanothermal activation method was adopted to increase the aluminum activity in the coal spoil. Over 95% of the aluminum in the CS could be extracted using this activation method. The mechanothermal activation process promoted the destruction of kaolinite structures and hindered the formation of amorphous γ-Al₂O₃. This resulted in a high aluminum leaching activity in the mechanothermally activated CS.

Keywords coal spoil mechanothermal compound activation leaching

Corresponding Author(s): Yuzhu SUN,Jianguo YU

Online First Date: 23 June 2015 Issue Date: 14 July 2015

Cite this article:

Xiaoxue SUN,Yuzhu SUN,Jianguo YU. Leaching of aluminum from coal spoil by mechanothermal activation[J]. Front. Chem. Sci. Eng., 2015, 9(2): 216-223.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-015-1518-2
https://academic.hep.com.cn/fcse/EN/Y2015/V9/I2/216

Tab.1 Chemical composition of CS (wt-%)

Fig.1 X-ray diffraction pattern of coal spoil

Tab.2 Chemical compositions of screened CS (wt-%)

Fig.2 DSC-TGA results of coal spoil

Fig.3 (a) Particle size distributions and (b) the corresponding D_0.5 and CV of CS ground in a planetary ball mill for 0-20 h

Fig.4 X-ray diffraction patterns of coal spoil and CS ground for 4 h

Fig.5 TGA results of coal spoil and CS ground for 4 h

Fig.6 Structure of kaolinite

Fig.7 IR spectra of CS ground for 30 min, 4 h and 20 h

Fig.8 Aluminum extraction yield from ground coal spoil

Fig.9 Aluminum extraction yield for coal spoil treated at different temperatures

Fig.10 Aluminum extraction yield for coal spoil calcinated for different times at 650 °C

Fig.11 X-ray diffraction patterns of coal spoil and CS calcinated at 650 oC

Fig.12 IR spectra of CS calcinated at different temperatures for 1 h

Fig.13 Aluminum extraction yield from coal spoil with mechanothermal activation

Fig.14 IR spectra of CS with and without mechanothermal activation

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