Abstract
Abstract The surface of Upper Freeport coal was oxidized by air at 150°C for up to 144 h, and the behavior of this coal during oil agglomeration was studied at various pH values. With increased oxidation time the surface concentration of both carboxyl and hydroxyl groups was increased, and the recovery of coal with a given amount of oil was decreased. Spherical agglomeration was possible only with the unoxidized or mildly oxidized coal. The effect of oxidation on the zeta potential and three-phase contact angle was studied as well as the relation between these parameters and the agglomeration behavior. The recovery of coal was also measured as a function of pH, oil dosage, and addition of the surface-active agents sodium oleate and cetyl trimethyl ammonium bromide. The results indicate that the relative oleophilic/hydrophilic nature of the coal surface is more important to the oil agglomeration process than the electrokinetic properties of the system.
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