Mineralogical Investigation of Calcium-containing Al-Fe Hydrolysis Polymer Products: Effect of Ageing on Their Species
- 责任者：Liu Shirong (State Key Laboratory of Ore Deposit Ceochemistry ; Institute of Geochemistry ; Chinese Academy of Science ; Guiyang 550002 ; China) ; Zhang Xinhua
- 刊名：Acta Mineralogica Sinica
- 出版年：2010
- 卷期：30(1)
- 关键词：针铁矿 ; goethite ; 矿物合成 ; mineral synthesis
- 页码：p.67-76
- 图表：7 illus., 4 tables, 28 refs.
- 分类号：0700
- issnNo：ISSN1000-4734
- isbnNo：CN52-1045/P
The nature of species formed in the system of calcium-containing ferric aluminum chloride with micro-silicon was explored with transmission and scan electron microscopy coupled with energy dispersive spectroscopy (TEM- EDS, SEM-EDS) , selected region electron diffraction (SRED) , chemical analysis for the liquid samples, fourier transform-infrared spectroscopy ( FTIR) , X-ray diffraction (XRD) , and thermal analysis. The results showed obvious natural alteration of calcium-containing Al-Fe hydrolyzed polymer by ageing. At the beginning of synthesis, there were vanous species in the samples, with Cl- as the charge balance ion, and Al and/or Fe combined with Ca to form ettringite-like double hydroxide structure and some micro-crystal phases of aluminum iron. There was also much amorphous Al, Fe or Al-Fe polymers. However, after being aged for nine years under acid and sealing conditions, nearly all of the micro-crystal phase disappeared. No micro-crystal phases could be seen under the electron microscopy and correspondingly, the feature peaks of them in the XRD patterns were also disappeared.