Abstract
The nature of metakaolin and its structural characteristics are being dealt in this chapter. The first question is: what is occurring on dehydroxylation and what happens to the Si–O–Al linkages present between two layers constituting kaolinite? There are two probabilities. It may happen that kaolinite partially or fully decomposes with disruptions of Si–O–Al bonding during dehydroxylation and liberate-free silica (A) or it may remain as an alumino-silicate (A) compound which decomposes at the vicinity at 980 °C exotherm. Various researchers conducted different chemical dissolution experiments in order to reveal indirectly the chemical linkages existing if any between tetrahedral silica sheet and dehydroxylated alumina layer. Mainly chemical techniques were employed. Since simple X-ray study exhibited amorphous pattern. Thus, it was speculated that metakaolinite be an amorphous mixtures of silica and alumina or amorphous compound. Acid dissolution study showed that alumina layer in metakaolinite either present in highly distorted state or it becomes amorphous. On the other hand, sodium carbonate extraction study showed that silica and alumina packets are not present in free state. Accordingly, two views were prevailed in the olden days.
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Chakraborty, A.K. (2014). Meta Kaolinite Phase. In: Phase Transformation of Kaolinite Clay. Springer, New Delhi. https://doi.org/10.1007/978-81-322-1154-9_19
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