發(fā)布時間：2018-04-19 10:29

  本文選題：鎂鋁復(fù)合氧化物 + 皂石��； 參考：《巖石礦物學(xué)雜志》2017年06期

【摘要】：復(fù)合金屬氧化物廣泛分布于自然界,其中鎂鋁復(fù)合氧化物(簡稱MMO)則大量分布于基性-超基性巖漿巖、蒸發(fā)河湖相和海相沉積巖等之中。本研究以鎂鋁水滑石(HT)煅燒產(chǎn)物MMO為研究對象,采用水熱合成方法,通過改變反應(yīng)時長,考察并揭示MMO在富硅、堿性和160℃水熱條件下的結(jié)構(gòu)復(fù)原特性及其轉(zhuǎn)化機(jī)制。X射線衍射結(jié)果顯示,該條件下MMO首先復(fù)水形成水滑石相,進(jìn)而水滑石相逐漸向皂石轉(zhuǎn)化,并伴有鈉霞石等雜相的形成與溶解。29Si和27Al魔角旋轉(zhuǎn)核磁共振譜(MAS NMR)的結(jié)果證明,在皂石結(jié)晶過程中,Al3+優(yōu)先占據(jù)四面體片層的四配位位置。該研究對揭示水滑石穩(wěn)定性、水滑石與硅酸鹽礦物異相成核與生長、熱液類型的天然皂石礦床的形成過程等具有重要指示意義。
[Abstract]:Composite metal oxides are widely distributed in nature, among which MMOs are widely distributed in basic-ultrabasic magmatic rocks, evaporative river and lacustrine facies and marine sedimentary rocks.In this study, the calcined product of magnesia-aluminum hydrotalcite (MMO) was used as the object of study. The hydrothermal synthesis method was used to investigate and reveal the presence of MMO in silicon-rich products by changing the reaction time.The characteristics of structure recovery and its transformation mechanism at alkaline and 160 鈩，

本文編號：1772722