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Clays and Clay Minerals; June 2002; v. 50; no. 3; p. 342-347
© 2002 Clay Minerals Society
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INFLUENCE OF SILICATE- AND MAGNESIUM-SPECIFIC ADSORPTION AND PARTICLE SHAPE ON THE RHEOLOGICAL BEHAVIOR OF MIXED SERPENTINE-GOETHITE SUSPENSIONS

P. Tartaj1,*, A. Cerpa2, M. T. García-González3 and C. J. Serna1

1 Instituto de Ciencia de Materiales de Madrid (CSIC), Campus de Cantoblanco 28049, Madrid, Spain
2 Facultad de Ingeniería Química, Instituto Superior Politécnico José Antonio Echeverría, Calle 127 s/n, Marianao 19390, C. Habana, Cuba
3 Centro de Ciencias Medioambientales de Madrid (CSIC), Serrano 115, Dpdo 28006, Madrid, Spain

* E-mail address of corresponding author: ptartaj{at}icmm.csic.es

The influence of dissolved species and particle morphology on the electrokinetic behavior and the initial yield stress values of Cuban lateritic aqueous suspensions was studied. The lateritic samples were mixtures of serpentine and goethite in different relative proportions. The addition of silicate and Mg ionic species, which are normally found in natural waters used in industrial processes, affected the electrokinetic and flow behavior of the lateritic suspensions. Specific adsorption of these species on particle surfaces was shown by a shift of the isoelectric point and the maximum of the initial yield stress to more acidic pH (Si ionic species adsorption) and more basic pH (Mg ionic species adsorption), when compared to suspensions containing only non-adsorbing electrolytes. The initial yield-stress values determined in samples consisting entirely of goethite varied from sample to sample. A detailed crystallochemical characterization revealed that these changes were associated with the axial ratio (i.e. ratio of particle length to width) of the mineral particles. Goethite samples with larger particle size (smaller number of particles for a given solid concentration) and greater axial ratios presented initial yield-stress values greater than those goethites with smaller particle size and lower axial ratio.

Key Words: Electrokinetic Characterization • Goethite • Lateritic Suspensions • Serpentine • Specific Adsorption • Yield Stress






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