An investigation on dewatering kinetics of ultrafine coal

Application of low-field NMR in the study of flocculant-aided filtration process of coal tailings

“…Alam et al (2011) studied the effect of preconditioning of coal tailings with flocculants on filtration performance and established the optimal dosage required for anionic and cationic flocculants. Tao et al (2003) investigated the kinetics of ultrafine coal filtration using cationic and anionic flocculants. They found that the addition of flocculant reduced the resistance of both filter cake and filter medium.…”

An integrated methodology to evaluate permeability from measured microstructures

“…A common practice to recover ultrafine coal, for example, is to flocculate the small particles into larger aggregates before dewatering, thus helping to improve the filtration rate by lowering the cake resistance and also preventing blockage of the filter medium. 1 The microstructure of filter cake has been shown to be responsible for the kinetics of cake formation and desaturation. 2 In general, small and compact aggregates seem to be more suited for filtration than large and loose aggregates, which tend to form compressible cakes and contain more intraparticle moisture.…”

Applying Froth Imaging Techniques to Assess Fine Coal Dewatering Behavior

“…The efforts of enhanced fine coal dewatering were focused on using chemical reagents to alter coal surface characteristics and slurry rheology for favorable dewatering conditions. It has been demonstrated that enhanced fine coal dewatering can be achieved by the use of flocculants and surfactants [7][8][9][10][11][12][13].…”

“…A summary of filtration kinetics is presented here to facilitate the understanding of the experimentation presented, though it has been analyzed by various researchers and widely published [10,[14][15][16][17][18]. The first stage of filtration is cake formation, with the flow of the wetting fluid through the bed being described by Darcy's law:…”