Structural change and mineralogical transformation mechanism of aluminum hydroxide gels from forced hydrolysis Al(Ⅲ) solutions containing AlO_4Al1_2(OH)_(24)(H_2O)_(12)^(7+) polyoxycation during aging  

作　　者：LIU Jing ZHAO Fenghua 

机构地区：[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

出　　处：《Chinese Journal Of Geochemistry》2010年第1期107-112,共6页中国地球化学学报

基　　金：supported by National Natural Science Fund of China (Grant No. 40972110);the specialized research fund for the doctoral program of Higher Education of China (Grant No. 2006029009);the program for New Century Excellent Talents in Universities and Colleges (Grant No. NCET-07-0801)

摘　　要：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.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.

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 

分 类 号：TQ133.1[化学工程—无机化工] O614.31[理学—无机化学]