Settling of Coal in Coal-Oil Slurries

Abstract

This study investigates the settling phenomenon of coal-oil solids as a function of solids concentration, initial slurry height, settling container diameter, temperature, chemical treatment, and application of ultrasonic radiation. Mathematical correlations developed by Michaels and Bolger were utilized in the analysis of the data and were found to be applicable for this system.

Surface Potential of Coal Particles in Coal-Oil Mixture and Control of Settling Stability Under Gravity

“…At present the maximum relative error of Equation (6) is 5.5% at ja ¼ 1, and 12% at ja ¼ 0.1. (5). It can satisfy this condition.…”

“…The values of zeta potential for coal particles in the oil are approximately more than 30 mv (see Table 4). Interparticle electrostatic interaction energy can be expressed as [5] …”

“…Most of the experiments used for the assessment of the sedimentation stability of COM. [5][6][7] But these studies investigated the settling phenomenon of coal-oil solids as a function of concentration, initial slurry height, settling volume, temperature, etc.…”

Coal-oil mixtures. 2. Surfactant effectiveness on coal-oil mixture stability measured with a sedimentation column device

“…They experimentally verified the relations using kaolin suspensions. More recently, Slagle et al (1978) have demonstrated the application of these settling rate equations in the dilute and intermediate concentration regions to coal in COM's. They remarked that the rate law would change from the intermediate to dilute approximations as the temperature is raised at constant particle concentration.…”