Rheology of coal-water slurries prepared by the HP roll mill grinding of coal. Quarterly technical report No. 7, March 1, 1994--May 31, 1994

Abstract

The objective of this research is the development of improved technology for the preparation of coal-water slurries that have potential for replacing fuel oil in direct combustion. This should be of major importance to the United States in its efforts to reduce dependence on imported oil and to rely more on its enormous low-cost coal resources. According to this objective, Quarterly Report No. 1 presented preliminary results on the rheological behavior of coal-water slurries prepared from Pittsburgh No. 8 coal that had been ground in a ball mill under various conditions. Quarterly Report No. 2 summarized the results of studies on the effects of solids content and water immobilization on the rheological behavior of coal-water slurries, including the role of different viscometers, such as the Haake Rotovisco RV-12 and Brookfield Synchro-Lectric LVT on the measured results. In Quarterly Report No. 3, the authors compared the rheological behavior of Pittsburgh No. 8 coal-water slurries using different sensor system. In Quarterly Report No. 4, studies on the role of the initial mixing procedure in the preparation of coal-water slurries were summarized. In Quarterly Report No. 5, the evaluation of the effect of a cationic surfactant (TMAE) and an anionic surfactant (2-TEPA) onmore » the rheological behavior and the aggregative stability of Pittsburgh No. 8 coal-water slurries was presented. In Quarterly Report No. 6, the effect of nonionic surfactants (Triton X series) on the aggregative stability of coal-water slurries was studied by measuring the relative sedimentation volume and floc size distribution.« less