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Reactions of metakaolinite with NaOH and colloidal silica — Comparison of different samples (part 2)

Lapides, I. / Heller-Kallai, L.

AbstractThe eight metakaolinites studied in Part 1 were reacted hydrothermally with NaOH and silica gel. After induction periods that were much longer than in the absence of additional silica the main products formed were zeolite A and X in different proportions, associated with minor amounts of zeolite P. The ratio of zeolite X to A formed after 120 h was greater in samples with longer induction periods. In samples with shorter induction periods crystals of zeolite X coated crystals of zeolite A, evidently shielding them from further reaction. No correlation could be established between any observed feature of the starting kaolinite and the product assemblages.

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Reactions of metakaolinite with NaOH and colloidal silica — Comparison of different samples (part 2)

Lapides, I. / Heller-Kallai, L.

AbstractThe eight metakaolinites studied in Part 1 were reacted hydrothermally with NaOH and silica gel. After induction periods that were much longer than in the absence of additional silica the main products formed were zeolite A and X in different proportions, associated with minor amounts of zeolite P. The ratio of zeolite X to A formed after 120 h was greater in samples with longer induction periods. In samples with shorter induction periods crystals of zeolite X coated crystals of zeolite A, evidently shielding them from further reaction. No correlation could be established between any observed feature of the starting kaolinite and the product assemblages.

Reactions of metakaolinite with NaOH and colloidal silica — Comparison of different samples (part 2)

Lapides, I. / Heller-Kallai, L.

AbstractThe eight metakaolinites studied in Part 1 were reacted hydrothermally with NaOH and silica gel. After induction periods that were much longer than in the absence of additional silica the main products formed were zeolite A and X in different proportions, associated with minor amounts of zeolite P. The ratio of zeolite X to A formed after 120 h was greater in samples with longer induction periods. In samples with shorter induction periods crystals of zeolite X coated crystals of zeolite A, evidently shielding them from further reaction. No correlation could be established between any observed feature of the starting kaolinite and the product assemblages.

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Title:

Reactions of metakaolinite with NaOH and colloidal silica — Comparison of different samples (part 2)

Contributors:

Lapides, I. (author) / Heller-Kallai, L. (author)

Published in:

Applied Clay Science ; 35 ; 94-98

Publication date:

2006-06-03

Size:

5 pages

ISSN:

DOI:

https://doi.org/10.1016/j.clay.2006.06.007

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Metakaolinite , Silica gel , Zeolite A , Zeolite X , Zeolite P

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