Resumo

HERNANDEZ RAMIREZ, Gabriel et al. Mathematical models of rheological parameters and their influence on the pumping system of non-Newtonian fluids. Rev.Colomb.Quim. [online]. 2018, vol.47, n.3, pp.52-60. ISSN 0120-2804.  https://doi.org/10.15446/rev.colomb.quim.v47n3.70248.

The present paper presents a study of the rheological parameters influence of lateritic hydromixtures with the energetic parameters of the pumping systems, which guarantee productivity when obtaining nickel sulphide. Experimental studies such as X-ray diffraction techniques, X-ray fluorescence and particle size analysis were carried out to model apparent viscosity, initial shear stress, mass consistency index and flow index. The above, based on the following factors: temperature, solids content, chemical and granulometric composition. The results showed that the lateritic suspensions behaved as non-Newtonian fluids with plasticity, due to their character of polydispersed materials, with a predominance of fine granulometry (particles less than 0.045 mm), which explains their rheological behavior, adjustable to the Bulkley - Herschel model at temperature values of 28 to 90 °C and solids concentration of 37 to 48 % (w/w). it is concluded that the use of a mathematical model that relates the rheological parameters of the lateritic pulp and the energy parameters of the pumping system contributes to energy-efficiency of the pulp feeding in the acid leaching process.

Palavras-chave : Lateritic hydromixes; lateritic mineral; mathematical models; rheological parameters; temperature.

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