By Akshoy Kumar Chakraborty
ISBN-10: 8132211537
ISBN-13: 9788132211532
ISBN-10: 8132211545
ISBN-13: 9788132211549
The e-book depicts finished stories on thermal decomposition of Kaolinite by way of diversified physico-chemical tools performed by means of numerous scientists in final a hundred years and result of the stories performed through writer in previous 33 years. It additionally offers a severe research of alternative perspectives on Kaolinite–Mullite response sequence, characterization of arguable spinel section in Kaolinite–Mullite response sequence and rationalization of DTA occasions of Kaolinite. The ebook is helping either researchers and scholars to grasp the recent mechanism of transformation of Kaolinite to Mullite. the recent response procedures mentioned within the booklet additionally aid ceramic specialists to synthesize Mullite grains in advertisement means for creation of Mullite porcelain and Mullite refractory.
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Extra info for Phase Transformation of Kaolinite Clay
Example text
Schuller and Kromer (1975) made differential TMA and 38 3 Thermal Methods showed two differential contraction steps as like previous authors and lastly a major contractile due to mullite formation. Flank (1979) explained two steps due to dehydroxylation and mullitization of kaolinite. DTA, TGA, and TMA studies done by Chakraborty and other researchers are documented for clays of varying origins. In general, the kaolinitic clay exhibits the following thermal events as listed below. (i) At 100–150 °C—A broad and shallow endotherm.
Oxides such as CuO accelerate the formation of mullite and cristobalite. Johnson et al. (1982) showed the size and temperature of the 2nd and 3rd exothermic peak are related to the presence of impurity phases in kaolinite. The presence of CaO in the ordered kaolinite shifts the 2nd exotherm higher in temperature from 1,275 to 1,250 °C. Similar trend is noted for disordered kaolinite. The 3rd exothermic peak is even more sensitive to impurities. 9 Interrelationship Between 1st and 2nd Exothermic Peaks in DTA Bulens and Delmon (1977) tried to present an interrelationship between 1st and 2nd exotherms by performing DTA study of mineralized kaolinite.
L. De Keyser, Contribution to the study of Mullite. Ber. Dtsch. Keram. Ges. L. De Keyser, R. Wollast, L. De Laet, Contribution to the study of OH groups In kaolin minerals. International Clay Conference (Pergamon Press, 1963b), pp. L. De Keyser, Note concerning the exotherm reaction of kaolinite & formation of spinel phase preceding that of mullite. International Clay Conference (Pergamon Press, 1963c), pp. 91–96 L. Erdey, F. Paulik, J. Paulik, Differential thermogravimetry. Nature 174, 885–886 (1954) F.
Phase Transformation of Kaolinite Clay by Akshoy Kumar Chakraborty
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