Abstract:Effective flocculation and dewatering of mineral processing streams containing colloidal clays has become increasingly urgent. Release of water from slurries in tailings streams and dam beds for recycle water consumption, is usually slow and incomplete. To achieve fast settling and minimization of retained water, individual particles need to be bound, in the initial stages of thickening, into large, high-density aggregates, which may sediment more rapidly with lower intra-aggregate water content. Quantitative … Show more
“…To achieve fast sedimentation, separate particles have to be bonded into larger, denser aggregates. This is usually achieved by bridging flocculant addition using long chain polymers but the aggregate structure and properties before flocculant addition are critical in this process because the flocculant locks together these initial aggregates and their contained water as we have shown [4]. Contemporary approaches to fine particle suspension control are based on the electrical double layer DLVO theory of colloid stability where electrostatic and van der Waal's forces determine whether a particular suspension will be stable or destabilised [1].…”
“…To achieve fast sedimentation, separate particles have to be bonded into larger, denser aggregates. This is usually achieved by bridging flocculant addition using long chain polymers but the aggregate structure and properties before flocculant addition are critical in this process because the flocculant locks together these initial aggregates and their contained water as we have shown [4]. Contemporary approaches to fine particle suspension control are based on the electrical double layer DLVO theory of colloid stability where electrostatic and van der Waal's forces determine whether a particular suspension will be stable or destabilised [1].…”
“…The interparticle forces between clay platelets are responsible for gelation in clay suspensions, which determines their rheological behavior [1][2][3][4][5] and settling phenomenon [6][7][8][9]. Studying the rheological behavior of clay suspensions is important in deep-sea seabed harvesting and in delivering and discharging of mining tailings.…”
“…The particle size distributions in the higher modal fractions in these measurements by Du et al [7] are considerably larger than the SEM results due to the kaolinite self-agglomeration in solution imaged in cryo-SEM studies [50]. It was recognized that these distributions do not represent complete dispersion of the powder.…”
Section: Particle Size Effect and Surface Force Considerationsmentioning
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