Compressional rheology: A tool for understanding compressibility effects in sludge dewatering

Stickland, Anthony D.

doi:10.1016/j.watres.2015.04.004

Cited by 61 publications

(25 citation statements)

References 58 publications

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“…Compressive yield stress is related to shear yield stress but is much larger . Three basic techniques can be used for its calculation: sedimentation; centrifugation; and pressure filtration …”

Section: Rheology Measurementsmentioning

confidence: 99%

Slurry rheology in mineral processing unit operations: A critical review

2019

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Knowledge of slurry rheology in mineral processing is essential for the optimization of wet-grinding, dewatering, transport, and tailings management and it is becoming important in flotation due to the increasing need to process complex ores with a high clay mineral content. Slurries of these ores often display complex rheological behaviour even at low solids concentration, and traditional rheology measurements in mineral processing, such as yield stress and apparent viscosities, may not provide the critical information needed for process optimization. The objective of this paper is to provide a comprehensive review of some of the previous rheology studies performed at the bench, pilot plant, and industrial scale for different unit operations and to discuss the potential for alternative rheology measurements to provide a better insight into colloidal particle interactions in slurries with clay minerals. Firstly, the fundamentals of slurry rheology and the influence of colloidal particles are presented. Secondly, rheology measurements for suspensions are described briefly. Thirdly, a review of rheology studies in grinding, classification, flotation, dewatering, and tailings management is done, outlining possible ways of determining types of particle associations in slurries. Finally, recommendations for future research directions are provided.

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Section: Rheology Measurementsmentioning

confidence: 99%

Slurry rheology in mineral processing unit operations: A critical review

2019

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“…Tensile stresses can develop at the surface of a drying body due to the constraint of drying shrinkage by the interior of the body. The development of such stresses depends on the drying speed . Fast drying occurs when the rate of evaporation exceeds the rate of transfer of the liquid from the interior of the body to the surface.…”

Section: Drying and Crackingmentioning

confidence: 99%

“…The development of such stresses depends on the drying speed. 314,323 Fast drying occurs when the rate of evaporation exceeds the rate of transfer of the liquid from the interior of the body to the surface. Slow drying occurs when the rate of evaporation is slower than the rate of transfer of liquid to the surface.…”

Section: Drying and Crackingmentioning

confidence: 99%

Colloidal processing: enabling complex shaped ceramics with unique multiscale structures

et al. 2017

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Colloidal processing of fine ceramic powders enables the production of complex shaped ceramics with unique micro and macro structures which are not possible to produce via conventional dry processing routes. Because of this enhanced structural control and shaping capabilities, colloidal processing has been exploited to produce ceramic components with ever increasing complexity and functionalities. In this review, we revisit some of the research efforts on this topic to highlight its relevance and growing importance for the advanced manufacturing of functional ceramics. Selected examples of colloidal systems with increasing level of complexity are discussed to showcase the wide range of structures that can be generated through wet processing approaches. The historical development and background knowledge pertaining to colloids and surface interactions is first briefly reviewed. The major colloidal shape forming and additive manufacturing processes that utilize colloidal pastes and inks are then reviewed, highlighting the control of suspension rheology needed in these techniques. Next, methodologies that combine suspended particles with a pore‐forming phase are discussed as a means to produce porous ceramic materials. Further control over the interactions between anisotropic particles and their alignment in suspensions can be gained via externally applied fields (such as magnetic) to produce texturally aligned green bodies. This leads to bioinspired ceramics that can programmably morph into complex shaped objects upon sintering. Hierarchical porous structures with high mechanical efficiency are also shown as an example of the multiscale designs that can be generated through advanced colloidal processing. As drying of ceramic bodies is an inevitable consequence of wet colloidal processing, the current understanding of this critical processing step is reviewed. Finally, the gaps in knowledge in these fields are discussed to provide our perspective on where the field may support advances in ceramics in the future.

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“…) derived from volume and momentum balances. The compressive rheology framework has previously been able to predict the highly resistive “skin” at the membrane surface .…”

Section: Resultsmentioning

confidence: 99%

Predicting Transmembrane Pressure Rise from Biofouling Layer Compressibility and Permeability

2017

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The operation of filtration membranes for wastewater treatment is severely affected by biofouling formation, which causes a rapid increase in transmembrane pressure (TMP) in constant rate filtration. The TMP rise is often attributed to particulate fouling within the membrane, but the external fouling layer or filter cake contributes significantly. The fouling is highly compressible, so any model must incorporate cake compression. A one-dimensional controlled rate model based on compressible cakes and accurate sludge properties is proposed to predict the TMP rise needed to maintain constant flux. Increased compressibility results in more rapid TMP rise. Model predictions were compared to pilot-plant data and showed good correlation, without assuming fouling within the membrane. Optimization of cycle times and flux rates are performed.

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Compressional rheology: A tool for understanding compressibility effects in sludge dewatering

Cited by 61 publications

References 58 publications

Slurry rheology in mineral processing unit operations: A critical review

Slurry rheology in mineral processing unit operations: A critical review

Colloidal processing: enabling complex shaped ceramics with unique multiscale structures

Predicting Transmembrane Pressure Rise from Biofouling Layer Compressibility and Permeability

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