The Brazilian bentonites of the Paraiba State, northeast of the country, and the bentonites from the Argentinean province of Neuquen, represent an important fraction of the smectitic clays used in Brazil. The traditional applications for these clays are as ligands for foundry sands and iron ores, tixotropic additives for the oil drilling well industries and as pet litter sands. Nowadays, the social changes caused by the developing of new materials, the expressive scientific discoveries involving clays as nanocomposites with biodegradable polymers and biopolymers and its application in several industry sectors and the new look from people towards our planet, about uses and care of natural resources, have rescued the interest for the use of clays as in natura materials for use in the cosmetic and pharmaceutical industries.
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