期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 359, 期 -, 页码 535-543出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2018.07.104
关键词
Coal fly ash; Mesoporous gamma-Al2O3; Lime-sinter method; CO2-assistant precipitation; Aluminum recovery
资金
- National Natural Science Foundation of China [21776160, 21576156]
- Beijing National Center for Electron Microscopy at Tsinghua University
- Shanghai Tongji Gao Tingyao Environmental Science and Technology Development Foundation
Mesoporous Al2O3 with crystalline framework walls has expanded all over the world due to the various potential applications especially in catalysis. Here, we develop a green and facile approach for the conversion of coal fly ash (CFA) into ordered mesoporous gamma-Al2O3. The practical and promising lime-sinter method was comprehensively studied for the extraction of aluminum from CFA as a first step. The extraction efficiency of aluminum could reach up to 87.42%, through calcining with CaCO3 at 1390 degrees C for 1 h and then dissolving in Na2CO3 solution at 70 degrees C for 0.5 h. Combined with the urgent demand for CO2 emission reduction, simulated purified flue gas was introduced to precipitate the Al(OH)(3) precursors without structure-directing agents for just 1 h, followed by calcining at only 400 degrees C or 550 degrees C. A series of characterizations were conducted to discuss the effect of precipitation temperature and calcination temperature, resulting the superior product (Al2O3-65/550) with high surface area (230.3 m(2) g(-1)), crystalline gamma-Al2O3 phase and ordered mesostructure. This proposed strategy, integrating the on-site recycling of CFA and utilization of CO2, appears to be promising for scalable production of mesoporous gamma-Al2O3.
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