Modelling of Particle Packing and Chemistry for CWM Rheology. First Annual Report Including 3RD and 4TH Quarterly Reports

摘要

The research under this contract is divided into two tasks: (1) modelling the yield behavior in Bingham and Casson slurries; and (2) effect of dispersants on adsorption/desorption isotherms on coal and oxide powders. In task one, new rheological equations have been investigated in order to learn and understand the slurry parameters described by the coefficients, and to investigate and model the effect of slurry characteristics such as solids content, particle size distribution, and surfactant additions on the rheology of these systems. Three systems are being used in this study; two different coals and alumina. At this stage, experimental data for viscosity, solids concentrations, particle size distribution, and effects of solids concentration on the viscosity are being analyzed. In task two a method of evaluating dispersant effectiveness has been developed by plotting zeta potential vs. pH as a function of dispersant concentration. The dispersant is added to the dilute powder slurry at pH 4 as a percent of water and stirred overnight. The sample is then titrated from pH 4 to 11 while zeta potential is continuously measured. Data for samples of Cedar Grove coal and aluminum oxide, using Lomar D and KOH are presented. (ERA citation 11:021902)