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Gregorio Zacahua-Tlacuatl, Jose-Gonzalez, J. Javier Castro-Arellano, Heberto Balmori-Ramirez
Rheological characterization and extrusion of suspensions of natural zeolites
Appl. Rheol. 20:3 (2010) 34037 (10 pages)
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A rheological characterization and extrusion of aqueous suspensions of natural zeolites were carried out in this work.
Preparation of suspensions followed similar routes to those used for the colloidal processing of ceramic powders.The suspensions
were prepared at different volume fractions (v/v%) ranging from 5 to 61 v/v% for a pH value of 7. The suspensions
showed a Newtonian behavior for solid contents up to 20 v/v% and shear thinning at higher solid loads. For solid contents
above 35 v/v%, the suspensions exhibited hysteresis and a yield stress that growth exponentially with the solid load. The
appearance of a yield stress and its fast growing at relatively low solid concentration, as compared to other type of ceramic
suspensions, is attributed to several factors as inter-particle interactions, the presence of relatively large particles and to the
influence of their irregular morphology. Also, a breaking stress was measured for solid contents above 35 v/v%, which characterizes
a failure of the structure of the suspensions after yielding. This breaking stress determines the onset of slip flow of
the suspensions, which is interpreted in this work as a signal of good extrusion characteristics. Finally, inexpensive and free
of surface defects tubes were obtained from natural zeolites.
► Cite this publication as follows:
Zacahua-Tlacuatl G, Perez-Gonzalez J, Castro-Arellano JJ, Balmorii Ramirez: Rheological characterization and extrusion of suspensions of natural zeolites, Appl. Rheol. 20 (2010) 34037.
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