Resumo

LAURENCIO-ALFONSO, Héctor Luís; RETIRADO-MEDIACEJA, Yoalbys  e  TORRES-TAMAYO, Enrique. Effect of solids concentration on the rheology of ceramic clay hydro-mixtures in the washing process. Min. Geol. [online]. 2023, vol.39, n.1, pp. 30-43.  Epub 31-Mar-2023. ISSN 1993-8012.

The rheological study of ceramic clay hydro mixtures is essential to design equipment and washing processes. Hydro mixtures with clay concentrations of 15%, 25%, 35%, 45% and 55% by weight were analyzed and the correlation of shear stress as a function of the velocity gradient was obtained. It was observed that for concentrations up to 15%, the fluid, presents Newtonian behavior as well as ideal plastic behavior for higher concentrations. In order to estimate values of plastic viscosity, the decreasing dependence of maximum packing fraction of the mixture as a function of the clay concentration was determined. As a result, a general model is proposed for estimating the apparent viscosity of the hydro mixture during the ceramic clay washing process, which considers the clay concentration, dynamic viscosity coefficient of the hydro mixture water and the velocity gradient.

Palavras-chave : Rheological behavior of hydro-mixtures; ceramic clays; apparent viscosity; maximum packing fraction.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )