Synthesis and properties of CaAl-layered double hydroxides of hydrocalumite-type

Viktor Tóth, Mónika Sipiczki, Attila Pallagi, Ákos Kukovecz, Zoltán Kónya, Pál Sipos, István Pálinkó

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15 Citations (Scopus)

Abstract

CaAl-layered double hydroxides (CaAl-LDHs) with various carbonate ion contents are essentially formed in Bayer liquors during the causticisation step in alumina production. Under well-defined conditions hemicarbonate is formed, which is beneficial in the process of retrieving both Al(OH)- 4 and OH- ions. In the current work, Ca2Al-LDHs with various carbonate contents were prepared by the co-precipitation procedure and the products were dried in different ways. Structural information was obtained by a variety of methods, such as X-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Elemental maps were constructed through a combination of SEM images and EDX measurements. The targeted CaAl-hydrocalumites were successfully synthesised. It was found that the method used for drying did not influence the basal spacing although it significantly altered the particle sizes.

Original languageEnglish
Pages (from-to)633-637
Number of pages5
JournalChemical Papers
Volume68
Issue number5
DOIs
Publication statusPublished - May 2014

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Keywords

  • CaAl-LDH
  • Drying methods
  • Structural characterisation
  • Synthesis

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering
  • Materials Chemistry

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