The Modes of Occurrence of Fe and Ti in Kaolin of West Beijing
京西煤系高岭土中铁、钛赋存状态研究

The modes of occurrence of Fe and Ti in kaolin of west Beijing were studied in detail by AEM and Mossbauer spectra. The results show that the mineral phases of Fe and Ti in the concentrates are mainly anatase with small amounts of goethite and Fe-Ti phase. Structural Fe is the main existing form of Fe and Ti in kaolinite. Four-fold coordination Fe 3 in Si-O tetrahedra and six-fold coordination Fe 3 and Fe 2 in Al-O octahedra are three existing types of structural Fe. This study is of significance both in the theoretical research on the kaolinite mineralogy and in the developmental practice of kaolinites in coal measures of west Beijing.