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Solubility of Calcined Kaolinite, Montmorillonite, and Illite in High Molar NaOH and Suitability as Precursors for Geopolymers

Werling, Nadja 1; Kaltenbach, Jonas 2; Weidler, Peter G. 2; Schuhmann, Rainer 1; Dehn, Frank 3; Emmerich, Katja 1
1 Kompetenzzentrum für Materialfeuchte (CMM), Karlsruher Institut für Technologie (KIT)
2 Institut für Funktionelle Grenzflächen (IFG), Karlsruher Institut für Technologie (KIT)
3 Institut für Massivbau und Baustofftechnik (IMB), Karlsruher Institut für Technologie (KIT)

Abstract:

Clays and clay minerals dissolve over a broad pH range, such as during sediment diagenesis and in a variety of applications, including nuclear waste storage, landfills, and geopolymer binders in the construction industry. The solubility depends on process parameters (pH, temperature, pressure, etc.) and material properties (phase content, clay mineral composition, particle size, etc.). Pretreatments such as calcination or severe grinding change the material properties and could enhance solubility, which is called activation. The aim of the current study was to determine the solubility of three different clay minerals after calcination (metakaolinite, metamontmorillonite, and metaillite) in high molar alkaline solutions (NaOH) up to 10.79 mol/L and pH = 14.73. Furthermore, the solubility of an Al(OH)3 powder in alkaline solution (NaOH) was analyzed, as it can be used to adjust the Si:Al ratio of geopolymer precursors. The residues of the clay minerals after the alkaline treatment were investigated to disclose potential alterations in their phase contents. Based on the results of the thermal and alkaline activation, conclusions about the suitability as geopolymer precursors were made. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000149117
Veröffentlicht am 28.07.2022
Originalveröffentlichung
DOI: 10.1007/s42860-022-00185-6
Scopus
Zitationen: 23
Web of Science
Zitationen: 21
Dimensions
Zitationen: 26
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Institut für Massivbau und Baustofftechnik (IMB)
Kompetenzzentrum für Materialfeuchte (CMM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 04.2022
Sprache Englisch
Identifikator ISSN: 0009-8604, 1552-8367
KITopen-ID: 1000149117
HGF-Programm 43.33.11 (POF IV, LK 01) Adaptive and Bioinstructive Materials Systems
Erschienen in Clays and Clay Minerals
Verlag Clay Minerals Society
Band 70
Heft 2
Seiten 270–289
Nachgewiesen in Scopus
Dimensions
Web of Science
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