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MINERALOGICAL PROPERTIES OF WHITE CLAY FROM MAGPET,
NORTH COTABATO IN THE PHILIPPINES

Martinez, E.R., Cabillon, S.L., Torillo, A.R., dela Cuesta, L.C., Navarro,
T.V., Calzada, C.V., Carandang, K.M. and Koya Shimosaka

 

 

 

 

ABSTRACT



Clay samples collected from the minesite of Magpet in Cotabato were studied by means of X-ray Dffraction, TG-DTA, IR, SEM, Optical and Chemical analyses. Observations were made on the raw and 2 >samples as well as on samples fired at 200oC, 300oC, 400oC, 500oC, 600oC, 700oC, 800oC, 1000oC and 1200oC.

Mineral determination by X-ray diffraction showed that comparatively well-crystallized kaolinite and cristobalite are substantially present with small amount of alunite. Scanning electron micrograph of the 2> sample revealed hexagonal platy crystals. Heat treated 2> sample at 500oC, showed no change on the crystal structure of kaolinite. However, at 500oC, comparatively greater decrease in the intensity of the OH stretching vibration in the region 3630 - 3700 cm-1 was observed. The absorption spectra and X-ray diffraction pattern of 2> showed that the kaolinite structure collapsed and Al-Si spinel is formed at about 1000oC with
exothermic reaction at 988oC This transformation is composed of a highly ordered development of a spinel-type phase. Subsequently, the spinel was transformed into mullite and cristobalite at about 12000oC.
 

 

 

 

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