Valorisation de résidus d'exploitation d'argiles dans des applications industrielles et environnementales

Abstract : Working Kaolinic refractory clays from Água Limpa (Minas Gerais) and paper coating kaolins from Rio Capim (Pará) - Brazil throw over very large amounts of mining residues. With the outlook of a more complete beneficiation, aiming at a sustainable development of mineral industry, the use of these residual clays has been considered for manufacturing zeolites. For a synthesis time of only 24h, a zeolite 4A very close to its theoretical definition is obtained.The nano-porous volume of the zeolite 4A is inaccessible to nitrogen molecules, but accessible to water molecules. Synthesised zeolites have been tested as cationic adsorbents of Cu, Pb, Cd, Zn, Mg, K and Hg. The retention is better for materials derived from Rio Capim Kaolins. The retention is close to 60% of the theoretical completion of the exchange capacity in all cases, except for copper for which the retention exceeds the capacity, and mercury for which the retention is very low.
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Lydia Armond Muzzi. Valorisation de résidus d'exploitation d'argiles dans des applications industrielles et environnementales. Sciences de la Terre. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL018N⟩. ⟨tel-01752839⟩

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