Estudo da correlação entre curvas de fluxo em defloculação e condutividade elétrica do meio

Abstract

Clays are particulate matter with a diameter of less than 2 microns (2mm / 1000), which includes most of the clay minerals made of microcrystalline aluminosilicates. The main groups of clay minerals are kaolinite, ilite and montmorillonite, and what differentiates these clay minerals is basically the type of structure and the substitutions that can occur. Crystals of clays can be associated in different ways: aggregation, flocculation, dispersion and deflocculation when dispersed in a solvent. The stabilization of the clay + solvent system is determined by the attraction and repulsion forces of the clay particles, which depends on their physico-chemical characteristics and the particle-solvent interface. Thus, this work aims to verify the electrokinetic behavior and viscosity of kaolinite and montmorillonite clay dispersions from the addition of sodium hexametaphosphate (deflocculant) to dispersion. From the obtained results, it was possible to model equations that describe the electrokinetic behavior of the dispersions as the deflocculant concentration increases and the viscosity behavior of the suspensions is verified, where they reach a minimum value related to the stabilization of the system (maximum deflocculation). It was still possible to verify the overdeflocation phenomenon of Verde-Lodo clay, where after the point of minimum viscosity, the continuous addition of deflocculant to the dispersed medium causes the viscosity to rise again.