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Significance of structural factors in dehydroxylation of kaolinite polytypes

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Abstract

The relations between the perfection of the structure, the size of the crystals and the course of dehydroxylation of kaolinite polytypes, as revealed by DTA and DTG curves, are discussed. The dehydroxylation of kaolinites is a peculiar type of homogeneous, intracrystal thermal dissociation. The kinetics of this process are dependent on the rate of removal of water vapour from the structure and its pressure in the structural domains.

Zusammenfassung

Beziehungen zwischen dem Ordnungsgrad der Struktur, der Kristallgrö\e und dem durch DTA und DTG verfolgten Verlauf der Dehydroxylierung von Kaolinit-Polytypen werden diskutiert. Die Dehydroxylierung von Kaolinit ist ein besonderer Typ einer homogenen, intrakristallinen thermischen Dissoziation. Die Kinetik dieses Prozesses ist von der Geschwindigkeit der Entfernung des Wasserdampfes aus der Struktur der Probe, also vom Wasserdampfpartialdruck in der Probe abhÄngig.

РЕжУМЕ

ОБсУжДЕНА сВьжь МЕжД У сОВЕРшЕНстВОМ стРУктУРы РАжлИЧНых пОлИтИпОВ кАОлИНА, РАжМЕРОМ кРИстАллОВ И пРОцЕссОМ Их ДЕгИДРОксИлИРОВАНИ ь, пРОВЕДЕННОгО МЕтОД АМИ ДтА И Дтг. пРОцЕсс ДЕгИ ДРОксИлИРОВАНИь кАО лИНОВ ьВльЕтсь ОсОБыМ тИпО М гОМОгЕННОИ, ВНУтРИкРИстАллИЧЕс кОИ тЕРМИЧЕскОИ ДИсс ОцИАцИь. кИНЕтИкА РЕАкцИИ ЁтО гО пРОцЕссА жАВИсИт От скОРОстИ У ДАлЕНИь пАРОВ ВОДы Иж стРУктУРы И От ДАВлЕНИь пАРОВ ВОД ы В стРУктУРНых ДОМЕНАх.

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Authors and Affiliations

  1. Institute of building materials and refractories, Academy of mining and metallurgy, 30-059, Cracow, Poland

    L. Stoch

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  1. L. Stoch
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Stoch, L. Significance of structural factors in dehydroxylation of kaolinite polytypes. Journal of Thermal Analysis 29, 919–931 (1984). https://doi.org/10.1007/BF02188838

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