The high-temperature TGA has been operated with steam and CO/sub 2/ for lignite and bituminous chars. Problems with temperature calibration require verification of results before further analysis. Work on attrition of coal in a pressurized, sand fluid-bed was completed. Conditions were 5-45 cm/sec at 1 to 7 atm total pressure. The rate obtained increases with fluidizing velocity and pressure. The rate constants are negligible at velocities below approx. = 30 cm/sec for particles 60 to 175 ..mu.. in diameter. Results appear to be dependent on change in hydrodynamics with pressure. A hot-bed fluidization system was commissioned and operated. Entrainment/elutriation data for coal particles was obtained in the range 5 to 90 cm/sec at 800 to 900/sup 0/C for a 12.7 cm sand bed.
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