THEORETICAL AND EXPERIMENTAL SINGLE WIRE STUDIES IN HIGH GRADIENT MAGNETIC SEPARATION
Abstract
Theoretical and experimental results for the single wire studies in high gradient magnetic separation are presented. The particle trajectory model is used for determining the qualitative effect of the various operating parameters, for determining the capture cross section and for determining particle trajectories. The model does predict the correct trajectory for Mn(,2)P(,2)O(,7) particles in water. The static equilibrium buildup model is used to determine the buildup profile for the upstream side of the collector wire, the saturation accumulation radius, and the critical capture angle. The optimal operating conditions of a magnetic separator are examined by maximizing the ratio of the magnetic force to the competing forces with respect to particle size. The effect of the viscosity of the carrier fluid is examined experimentally. It is found that the initial buildup rate, for the axial flow orientation, is adequately described by the equation R(,a)('4) = At + 1. The saturation accumulation radius is proportional to (V(,m)/V(,0))('1/3). This result is explained by a simple force balance at the surface of the buildup. The experimental results for the transverse and longitudinal orientations are also given. The capture of diamagnetic and weakly paramagnetic particles are compared to theoretical predictions. This capture is made possible by altering the magnetic susceptibility of the carrier fluid. The preliminary experimental results for the separation of two liquids are given.
Degree
Ph.D.
Subject Area
Chemical engineering
Off-Campus Purdue Users:
To access this dissertation, please log in to our
proxy server.