Análise de sedimentação de partículas em recipientes de diferentes diâmetros e alturas

Abstract

The proposed work was based on the theoretical principles of gravitational sedimentation, with the purpose of evaluating the influence on the settling velocity of particles due to proximity to the wall of where we're going to decanting. However, considering that this movement is also influenced by other factors such as: the fluid dynamic properties, particle characteristics and properties of the system. Initially held the mineralogical description of the kaolin’s sample through analysis on Petrographic Microscope and analysis Images from the Scanning Electron Microscope. After this description, was prepared the sample by homogenization and quartering a technique usually used. Subsequently characterized the solid sample aliquots prepared, where there was moisture and density of the same for subsequent preparation of the pulp, of kaolin to 15% solids by weight. Once prepared, the pH was checked and the viscosity of the fluid that enabled characterized it as non-Newtonian. Then sedimentation tests were carried out in six containers of different diameters and heights, where was possible to conclude that the height and diameter have a dramatic impact on settling velocity, and the containers of larger diameters and greater heights had higher speeds during this process. However, the container influence of greater height prevailed over the larger diameter of the container.