The paper reports a laboratory study on the rheological behaviour of concentrated aqueous suspensions of zeolitite, belonging to the geological formations of «tufo giallo napoletano» in the Phlegraean Fields (Campania). Rheological measurement performed by means of a rotational viscometer demonstrated how the suspensions show a practically newtonian behaviour up to about 40 wtOfo of solid content in absence of deflocculants and up to about SO wtOfo of solid content in presence of Na-SIL and Na-TPP detlocculants. At higher solid concentrations they assume a non-newtonian behaviour. Na-TPP shows a greater deflocculating ability toward zeolite suspensions than Na-SIL. This may be explained by considering, in particular, its sequestering action towards the flocculating ions.
Rheological behaviour of aqueous concentrated suspensions of an Italian zeolite / Andreola, Nora Maria; Manfredini, T.; Pellacani, G. C.; Pozzi, Paolo; Romagnoli, Marcello. - In: MATERIALS ENGINEERING. - ISSN 1120-7302. - STAMPA. - 5(2):(1994), pp. 183-195.