Raw magnesite is slightly porous but its porosity could be increased on heating at and above 500°C. Its adsorption characteristics were investigated for various activation temperatures, times and particle sizes. Maximum adsorption capacity was found for 100–230-mesh magnesite particles activated at 500°C for 2 h. This has produced low color index re-refined oil. One of the economical features is the reproducibility of the results after regeneration of the spent magnesite samples. An excellent feature of the adsorbent is the efficient removal capability of aromatics especially PAH, which is supported by UV and FTIR studies of oils.
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Kamal et al. (2013) studied this question.
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