Determination of the attachment and detachment forces in a coal grain/liquid/coal grain system by detachment experiments

On the basis of measurements of the destruction time of a coal sediment col umn structure, which were described earlier, a further and more detailed an alysis of the results of these measurements was carried out. The radius of the contact plane between coal particles in the studied liquids was calcula ted. The values of the radius decreased with increasing length of the hydro carbon chain of both alkanes and alcohols. Next, the values of the attachme nt force of two coal particles through a liquid were calculated and they in creased with increasing length of the hydrocarbon chain of both liquids. We have found a linear relationship between reciprocal of the destruction tim e and the difference in the detachment and attachment forces, From this rel ationship we concluded that the work of adhesion of the liquid to the coal surface also influenced the attachment force between coal particles through the liquid.