| Study, with Different Characterization Techniques, of the
Formation of Cordierite from both Natural and Activated
Algerian DD3 Kaolin |
Meriem Kheloui,a, * Khaled Boumcheddaa and Abdelyamine Naitboudab
Pages: 88-93
DOI : 10.1080/0371750X.2020.1735522 |
| Abstract |
| The work presented in this article deals with the synthesis of a cordierite ceramics,
using a natural Algerian kaolin named DD3 of black colour, located in the region of
Djbel Dbagh in Guelma. A synthesis was also carried out on bleached DD3 kaolin obtained
by activation of hydrochloric acid on natural kaolin in order to eliminate the manganese
oxide (which is responsible for the blackish colour) while enlarging the application
field in industry (e.g. luxury porcelain). Preparation of this cordierite was carried out by
adding the precipitated magnesium hydroxide and a silica deficit for each type of kaolin.
Mixtures of pellet finely milled and pressed as pelleted powders were sintered at different
temperatures (1150o, 1250o and 1350oC) for 2 h before being characterized. The results
obtained by X-ray diffraction showed that the cordierite phase crystallized at 1250oC
for both types of black and bleached samples, which was confirmed by Raman
spectroscopy. Scanning electron microscopy was used to observe densification,
homogeneity as well as the size of the sample constituents. Their coefficients of thermal
expansion were respectively 1.9510–6 and 1.6910–6 oC–1 between 23o and 800oC, which
allowed their use in automobile catalytic converters.
[Keywords: Natural kaolin, Activated kaolin, Cordierite, NMR spectroscopy,
Thermal expansion] |
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