The behavior of tar sand fragments, molded into either slabs or spheres, was examined when exposed to low-velocity streams of the products of combustion of lean CH4-air mixtures, at temperatures of 700 K to 1200 K or lean H2-air mixtures at temperatures of 700 K to 1000 K. The processes of volatilization followed by slow oxidation were identified at low temperatures while autoignition and subsequent combustion of the volatiles complemented and enhanced the volatilization stage at higher temperatures. Some gross kinetic parameters of the processes involved are then evaluated using the mass loss and ignition delay data obtained.

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