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Frontiers of Chemical Science and Engineering >> 2015, Volume 9, Issue 2 doi: 10.1007/s11705-015-1518-2

Leaching of aluminum from coal spoil by mechanothermal activation

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

Accepted: 2015-06-23 Available online:2015-07-14

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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 -Al O . This resulted in a high aluminum leaching activity in the mechanothermally activated CS.

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