| Structural change and mineralogical transformation mechanism of aluminum hydroxide gels from forced hydrolysis Al（Ⅲ） solutions containing AlO4Al12（OH）24（H2O）12^7＋ polyoxycation during aging |
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| 作者单位： | [1]The State Key Laboratory of Coal Resource ＆ Mining Safety, China University of Mining and Technology, Beijing 100083, China [2]Department of Resource and Earth Science, China University of Mining and Technology, Beijing 100083, China |
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| 基金项目： | This work was financially supported by National Natural Science Fund of China，the specialized research fund for the doctoral program of Higher Education of China，the program for New Century Excellent Talents in Universities and Colleges |
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| 摘 要： |
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| 关 键 词： | 氢氧化铝凝胶 铝（Ⅲ） 强迫水解 矿物转化 结构变化 老化过程 激励机制 俄亥俄州 |
Structural change and mineralogical transformation mechanism of aluminum hydroxide gels from forced hydrolysis Al(III) solutions containing AlO4Al12(OH)24(H2O)127+ polyoxycation during aging |
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| Authors: | Jing Liu and Fenghua Zhao |
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| Abstract: | The structural change and mineralogy of Al gel during aging time were investigated by using spectroscopy techniques. The results
indicated that: 1) the aggregation extent of solution-gel system increases with aging time, and the structure of amorphous
gel becomes more short-ordered; 2) after six months, the gel formats nordstrandite and little gibbsite; 3) a marked decrease
in the number of (Al-OH)oh bands occurring at 610 cm?1 and increase in the number of (Al-OH2)oh bands occurring at 555 cm?1 indicate that the gel undergoes rearrangement-like process during aging; 4) the gel constantly contains Al-O tetrahedron
of Keggin structure, but the signal peak occurring at ≈61×10?6 of 27Al MAS NMR have a slight shift to downfield with aging time. A mineralogical transformation mechanism for hydrolysis Al(III)
solution was proposed. |
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| Keywords: | Al gel structural change Keggin structure transformation mechanism |
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