“For some time, the steel industry has faced increasing difficulty with the disposal of sludges resulting from steelmaking operations. The usual methods of disposal include placing the waste material in on-site lagoons or landfills and recycling. However, before they can be discarded or recycled, these waste sludges have to go through a dewatering process to increase their solids content. Conventional dewatering techniques have been found to be inadequate for the treatment of such sludges, which are very fine and contain a significant amount of iron. In recent years it has been shown that a multi-force dewatering technique utilizing the synergistic application of magnetic, chemical and gravitational forces is more effective in case of waste sludges containing fine magnetic material than conventional dewatering, which does not employ magnetic force. This research attempts to understand the reasons behind the demonstrated effectiveness of the magnetic dewatering process. Initially, an experimental setup is used to observe the cake morphology as well as measure several physical quantities under a variety of magnetic configurations. Subsequently, a computer model is developed to simulate the behavior of particles in the sludge when subjected to a combination of gravity, viscous and magnetic forces.
The cake morphologies observed during the course of the experiment clearly show that the magnetic dewatering technique permits the cake to remain porous during dewatering, thus allowing enhanced capacity through increased cake thickness. Quantitative results duplicate those from previous studies and provide more evidence in favor of the effectiveness of the magnetic dewatering technique. Simulation results show the striking differences in terms of particle alignment, and therefore cake formation, between a magnetic and a conventional dewatering process”--Abstract, page iv.
Watson, John L.
Schlesinger, Mark E.
Materials Science and Engineering
M.S. in Metallurgical Engineering
University of Missouri--Rolla
xii, 97 pages
© 1995 Arun Karamcheti, All rights reserved.
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Karamcheti, Arun, "Mechanism determination and modeling of the magnetic dewatering process" (1995). Masters Theses. 1489.
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