Mechanochemical intercalation of low reactivity kaolinite |
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| Affiliation: | 1. Institute of Materials Engineering, University of Pannonia, PO Box 158 H-8201 Veszprém, Hungary;2. Institute for Environmental Engineering, University of Pannonia, PO Box 158, H-8201 Veszprém, Hungary;1. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China;3. Centre de Recherche sur la Matière Divisée, CNRS-Université d’Orléans, Orléans 45071, France;4. Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou 510640, China |
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| Abstract: | Complete urea-intercalation of a low reactivity kaolinite from Birdwood has been carried out by co-grinding with urea in the absence of water (mechanochemical intercalation). The effectiveness of mechanochemical intercalation was compared to solution intercalation by X-ray diffraction (XRD), thermal analysis (TG, DTG), diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy and scanning electron microscopy (SEM). In aqueous solution of urea the Birdwood kaolinite was intercalated with difficulty and only 12% intercalation was achieved. After 2 h of co-grinding with solid urea, complete (100%) intercalation was attained. The possible explanation of complete intercalation is that co-grinding of Birdwood kaolin with solid urea can remove the high-defect kaolinite coating, which prevents the intercalation of the low-defect kaolinite particles. The mechanochemical treatment increased the degree of intercalation and in parallel reduced the amount of the crystalline kaolinite phase. |
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