Analysis of Consistencies of Kaolin-Water Systems Below the Plastic Range1

Robert B. Langston2 and Joseph A. Pask3
Ceramics Laboratories, Division of Mineral Technology, University of California, Berkeley
1 This study was sponsored as a Grant-in-Aid by the Institute of Geophysics, University of California, Los Angeles, California.
2 Research Chemist, Institute of Engineering Research, University of California, Berkeley, California.
3 Professor of Ceramic Engineering, Division of Mineral Technology, College of Engineering, University of California, Berkeley, California.

Abstract: Consistency curves and characteristics of Newtonian, pseudoplastic, Bingham body, thixotropic and dilatant types of flow are reviewed. The theoretical effects of particle shape on effective hydrodynamic volume and shear resistance for ideal suspensions are considered.

The rheological properties of hydrogen and sodium mono base-exchanged kaolinite clays were determined, using a rotational viscometer, on slips containing up to 50 g solids per 100 g slurry. Changes in rheological properties were also evaluated as a hydrogen slip containing 20 g solids per 100 g slurry was converted into the sodium form.

The discussion includes the effect of differences in charges and charge distribution on the sodium and hydrogen particles and the resulting effects on particle orientation and flocculation. Correction factors for dissociation and particle interference have allowed the use of Einstein's equation for the viscosity of a suspension up to concentrations of about 40 percent solids for the hydrogen kaolinite system, and about 50 percent solids for the sodium kaolinite system.

Clays and Clay Minerals; 1956 v. 5; no. 1; p. 4-22; DOI: 10.1346/CCMN.1956.0050103
© 1956, The Clay Minerals Society
Clay Minerals Society (www.clays.org)