The use of clays for ceramic filter processing may reduce its cost, leading to different applications, as water treatment.
In this work, a low cost tile clay mixed with kaolin, for use in ceramic filters, were evaluated. Mineralogical and thermal
changes occurring during sintering were characterized by differential thermal analysis, thermogravimetry, thermomechanical
analysis and X-ray diffraction. An increase in the initial melting temperature of samples due to kaolin addition was observed.
Mullite formation in kaolin was observed by DTA and in other samples by XRD. TMA analysis permitted the observation of pre-sintering
step, around 850C. This step is difficult to observe in other types of analysis.
The paper deals with the use of some ceramic materials for the removal of55+59Fe3+ and60Co2+ ions from residual waters. For this purpose, chamotte powder has been used both by itself or in a mixture with aluminium oxide. The pastes obtained by wetting these materials have been shaped in the form of crucibles. The radioactive ions which exist in residual effluents, have been retained to a large extent on these filters. Separately, the leaching of radioactive ions previously retained on the filtering mass, has been studied under the influence of water and of diluted solutions of hydrochloric acid or sodium chloride.