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Synthesis of sodalite from Brazilian kaolin wastes

Published online by Cambridge University Press:  02 January 2018

Ana Áurea B. Maia ,
Roberto F. Neves ,
Rômulo S. Angélica  and
Herbert Pöllmann
Ana Áurea B. Maia*
Affiliation:
Faculdade de Ciências Exatas e Tecnologia, Universidade Federal do Pará, Campus Abaetetuba, Rua Manoel de Abreu s/n, CEP: 68440-000, Abaetetuba - Pará - Brazil
Roberto F. Neves
Affiliation:
Programa de Pós Graduação em Geologia e Geoquímica, Universidade Federal do Pará, Campus Guamá, Rua Augusto Corrêa, 01, 66075–110, Belém-Pará, Brazil
Rômulo S. Angélica
Affiliation:
Programa de Pós Graduação em Geologia e Geoquímica, Universidade Federal do Pará, Campus Guamá, Rua Augusto Corrêa, 01, 66075–110, Belém-Pará, Brazil
Herbert Pöllmann
Affiliation:
Institut für Geowissenschaften, Mineralogie Martin-Luther Universität, Halle-Wittenberg, Von-Seckendorffplatz 3, 06120- Halle, Germany
*
*Email: anabmaia@ufpa.br
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Abstract

Kaolin wastes from the Capim and Jari regions (Brazil) were used to produce sodalite under the same conditions used in the Bayer process, in order to control its formation when necessary. Of the two kaolin source materials, the kaolinite from the Jari region was more reactive in the synthesis of sodalite, which is attributed to the low degree of structural order of this clay mineral which increased its reactivity. At a temperature of 150°C and with a Na/Al ratio of 2, although the kaolinite did not react completely, sodalitewas the primary reaction product. An increase in the temperature to 200°C provoked the complete reaction of the kaolinite only for the products in which carbonate and sulfate were used. With a Na/Al ratio >2 and for both of the temperatures, the kaolinite reacted completely to form sodalite.

Keywords

kaolin wastekaolinitesodalite
Type
Research Article
Information
Clay Minerals , Volume 50 , Issue 5 , December 2015 , pp. 663 - 675
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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