ELABORATION AND MODELING THE RHEOLOGICAL BEHAVIOR OF PHOSPHORIC ACIDS
AND STUDY OF THE MgO IMPACT ON THEIR VISCOSITIES
Abstract
Elaboration of rheological behavior of phosphoric acids H 3 PO 4 is very
important. In this paper we elaborated experimentally the rheological
behavior of various phosphoric acids produced in Jorf-Lasfar phosphoric
plant in Morocco, including phosphoric acids (PA) of 18%, 29%, 42%
and 54% in P 2 O 5. Thus, we studied the effect of temperature and
density on the rheological behavior of (PA) and the influence of
magnesium monoxide derived from phosphate rock, which has a remarkable
impact on the viscosity of (PA). Rheological measurements are made by
the rotary cylinder rheometer over the range of shear rates (1 - 1000 S
-1). We also were interested to establish the fluid-flow activation
energy (Ea) corresponding to each acid. Our study has been completed by
modeling all the rheological profiles of the acids by the regression of
these profiles to the empirical models of Casson, Bingham, Power-Law and
Herschel-Buckley.