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Leaching of aluminum from coal spoil by mechanothermal activation

Frontiers of Chemical Science and Engineering 2015年第2期9卷 216-223页

作者： Xiaoxue SUN Yuzhu SUN Jianguo YU State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

The process of order to recover aluminum investigated. The CS was activating coal spoil （CS） in as a high value product was first characterized by X-ray fluorescence （XRF）, X-ray diffraction （XRD） and thermo- gravimetric 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 destruc- tion of kaolinite structures and hindered the formation of amorphous γ-Al2O3. This resulted in a high aluminum leaching activity in the mechanothermally activated CS.

关键词： coal spoil mechanothermal compound activa-tion leaching

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Leaching Behavior of Trace Elements in coal spoils from Yangquan coal Mine, Northern China

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Journal of Earth Science 2016年第5期27卷 891-900页

作者： Xubo Gao Mo Xu Qinhong Hu Yanxin Wang State Key Laboratory of Biogeology and Environmental Geology and School of Environmental Studies China University of GeosciencesWuhan 430074China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection&College of Environment and Civil Engineering Chengdu University of TechnologyChengdu 610059China Department of Earth and Environment Sciences University of Texas at AustinAustin TX76019USA

The long-term dumping of coal waste piles has caused serious environmental problems. Release of trace elements（including rare earth elements, REEs） from coal spoils gobs was investigated at Yangquan coal mine, Shanxi Province, China. X-ray diffraction（XRD） was used to analyze the mineral composition of the coal spoils. The minerals of the coal-spoil samples are mainly kaolinite and quartz, with a minor proportion of pyrite. The batch and column tests were employed to simulate the leaching behavior of trace elements from coal spoils. Elements V, Cr, Zn, As, Pb, and Cd are highly enriched in all coal spoils. The coal spoils also have elevated levels of Ga, Ge, Se, Sn, Hf, and Th. The leachate of coal spoils, fried coal spoils and CSFGM（coal spoils fire gas mineral） samples are acidic, with the p H values ranging between 3.0 and 6.6. The released elements with high concentrations（over 100 μg/L） include Fe, Mn, Co, Ni and Zn, while moderately-released elements are Cu, Se, Mo and As. A high content of heavy metals in batch-test leachate with CSFGM indicates an increased mobility of heavy metals in coal spoil combustion byproduct. Within the first hour washing with the electrolyte solution, a rapid rise of common cations, trace elements, and REEs content, as well as a drop of p H value, in effluent was observed. An increased leaching velocity favors the release of trace elements from coal spoils. In addition, the pulse input of precipitation led to more elements to be released than continuous leaching.

关键词： trace elements coal spoil contamination leaching column test.

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