Published online by Cambridge University Press: 09 July 2018
Les traitements classiques appliqués pour disperser les argiles et les séparer des carbonates, des phosphates et des sulfates, sont souvent agressifs vis a vis de celles-ci. Une méthode de traitement utilisant les résines échangeuses de cations (REC) a été mise au point. La résine utilisee est l’amberlite IRC-50H. Elle a été éluée ã HCl 1·5 N et utilisée a une température de 60°C. Ce traitement a permis une très bonne dispersion des suspensions de matière d’argile, et l’élimination complete des carbonates, des sulfates et des phosphates. En raison de leur structure silicatée et de leur composition chimique, les argiles sont peu attaquees par les REC, de plus elles sont protegees par les minéraux susceptibles d’être dissous par les REC (carbonates, phosphates et sulfates).
Conventional treatments carried out for dispersion of clays and their separation from carbonates, phosphates and sulphates, are often more or less aggressive for clays. A treatment is proposed using cation exchange resin (CER)amberlite IRC-50H. The resin was eluted with 15 N HCl and was used at 60°C. This provides a high dispersion of the suspended matter and completely removes carbonates, sulphates and phosphates. Clays are slightly attacked by CER, because of their silicate structure and their chemical composition, but are protected by the accompanying minerals (carbonates, phosphates and sulphates) which are more sensitive to CER dissolution.
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