Adhesion of Micron-Sized Limestone Particles to a Massive Coal Substrate

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Abstract
The force of adhesion was measured between limestone (calcite) particles with a mass mean diameter of 1.6 μm resting on a massive coal substrate under ambient conditions where the relative humidity was controlled from test to test between the limits of 18 and 93.5%. The force of adhesion for these particles was less than 0.1 millidyne for relative humidities less than 72% and increased to greater than 0.8 millidyne above 93% relative humidity. A model for this variation is proposed which suggests that the Van der Waal's forces are operative between the particle and substrate below 72% relative humidity and that the adsorbed water film on the limestone interacts with capillary water in the porous coal structure when the relative humidity is above 75 %.

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