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Journal of Engineering
Volume 2013, Article ID 930832, 4 pages
http://dx.doi.org/10.1155/2013/930832
Research Article

Sodium Tripolyphosphate and Polyphosphate as Dispersing Agents for Alumina Suspensions: Rheological Characterization

Dipartimento di Chimica, Fisica e Ambiente, Università degli Studi di Udine, Via del Cotonificio 108, 33100 Udine, Italy

Received 24 January 2013; Accepted 29 May 2013

Academic Editor: Paul Luckham

Copyright © 2013 L. Piani and A. Papo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the present work, the influence of addition of some dispersing agents employed for maximizing the solid loading of alumina concentrated suspensions has been investigated. Two commercially available deflocculants were used: a sodium tripolyphosphate and a sodium polyphosphate. Rheological tests were carried out at 25°C under continuous flow conditions by using the rate-controlled coaxial cylinder viscometer Rotovisko-Haake 20, system M5-osc., measuring device SV2P with serrated surfaces. The application of rheological techniques permitted the evaluation of the efficiency and the optimum dosage of the dispersing agents employed upon the alumina slips examined, that is, the critical concentration at which the maximum reduction in viscosity is detected.