TY - JOUR
T1 - Reactions of salts with kaolinite at elevated temperatures - Part 2
AU - Heller-Kallai, L.
AU - Frenkel, M.
PY - 1979/1/1
Y1 - 1979/1/1
N2 - Abstract Reactions of kaolinite and metakaolinite with salts of alkali metals were studied in the temperature range of 570-950°C, in air and in a nitrogen atmosphere, using thermal and chemical analyses and infra-red spectroscopy, supplemented by other methods. The mixtures react according to the equation 2SiO2.Al2O3-xH2O + 2yMA → 2SiO2.Al2O3.yM2O + (x-y)H2O + 2yHA The water required may be derived from clay hydroxyls or from the atmosphere. The rate is faster when the clay has not been entirely dehydroxylated, but even trace amounts of water in the surrounding atmosphere sustain the reaction. With Li, Na or K salts products resembling eucryptite, nepheline or kalsilite, respectively, tend to be formed. Molten K2CO3 reacts with dehydroxylated kaolinite even in the absence of detectable amounts of water. Prolonged heating with KF leads to anion exchange.
AB - Abstract Reactions of kaolinite and metakaolinite with salts of alkali metals were studied in the temperature range of 570-950°C, in air and in a nitrogen atmosphere, using thermal and chemical analyses and infra-red spectroscopy, supplemented by other methods. The mixtures react according to the equation 2SiO2.Al2O3-xH2O + 2yMA → 2SiO2.Al2O3.yM2O + (x-y)H2O + 2yHA The water required may be derived from clay hydroxyls or from the atmosphere. The rate is faster when the clay has not been entirely dehydroxylated, but even trace amounts of water in the surrounding atmosphere sustain the reaction. With Li, Na or K salts products resembling eucryptite, nepheline or kalsilite, respectively, tend to be formed. Molten K2CO3 reacts with dehydroxylated kaolinite even in the absence of detectable amounts of water. Prolonged heating with KF leads to anion exchange.
UR - http://www.scopus.com/inward/record.url?scp=2142812762&partnerID=8YFLogxK
U2 - 10.1016/S0070-4571(08)70762-3
DO - 10.1016/S0070-4571(08)70762-3
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AN - SCOPUS:2142812762
SN - 0070-4571
VL - 27
SP - 629
EP - 637
JO - Developments in Sedimentology
JF - Developments in Sedimentology
IS - C
ER -