Sub-micron particle dewatering using hydrocyclones

Pasquier, Sylvain; Cilliers, J.J.

doi:10.1016/s1383-5866(00)00103-9

Cited by 59 publications

(27 citation statements)

References 10 publications

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“…It is consistent with the observation that, in many cases, the fine inflection is most pronounced when the value of Rf is quite high (Pasquier and Cilliers, 2000). However, the model does not predict two features that are sometimes reported for the fine inflection: (1) it does not allow the value of S(d) for the small particles to exceed the value of Rf, and (2) it does not account for cases where S(d) for the fine particles first rises, and then falls again.…”

Section: Fine Inflectionssupporting

confidence: 92%

Optimization of Comminution Circuit Throughput and Product Size Distribution by Simulation and Control

Kawatra¹,

Eisele²,

Weldum³

et al. 2005

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The goal of this project was to improve energy efficiency of industrial crushing and grinding operations (comminution). Mathematical models of the comminution process were used to study methods for optimizing the product size distribution, so that the amount of excessively fine material produced could be minimized. The goal was to save energy by reducing the amount of material that was ground below the target size, while simultaneously reducing the quantity of materials wasted as "slimes" that were too fine to be useful. Extensive plant sampling and mathematical modeling of the grinding circuits was carried out to determine how to correct this problem. The approaches taken included (1) Modeling of the circuit to determine process bottlenecks that restrict flowrates in one area while forcing other parts of the circuit to overgrind the material; (2) Modeling of hydrocyclones to determine the mechanisms responsible for retaining fine, high-density particles in the circuit until they are overground, and improving existing models to accurately account for this behavior; and (3) Evaluation of the potential of advanced technologies to improve comminution efficiency and produce sharper product size distributions with less overgrinding. The mathematical models were used to simulate novel circuits for minimizing overgrinding and increasing throughput, and it is estimated that a single plant grinding 15 million tons of ore per year saves up to 82.5 million kWhr/year, or 8.6 x 10 11 BTU/year. Implementation of this technology in the midwestern iron ore industry, which grinds an estimated 150 million tons of ore annually to produce over 50 million tons of iron ore concentrate, would save an estimated 1 x 10 13 BTU/year. 4

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Section: Fine Inflectionssupporting

confidence: 92%

Optimization of Comminution Circuit Throughput and Product Size Distribution by Simulation and Control

Kawatra¹,

Eisele²,

Weldum³

et al. 2005

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“…For the separation of the high concentration domestic sewage, the foulant concentration in the overflow reduced with the increase of the feed foulant concentration basically, indicating that the more foulant contained in the sewage the better the separation performance. In addition, the concentration difference between the feed concentration and the concentration in the overflow in the high concentration domestic16 sewage experiments was much higher than that in the low concentration domestic sewage.…”

mentioning

confidence: 81%

“…Its cut size is generally within 2~250 μm, sometimes even reaches to the grade of sub-micron [16]. Until recently, the hydrocyclone has been successfully and widely used in mineral industry [17], coal industry [18,19], chemical industry [20], environmental engineering [21], petroleum industry [22], pulp and paper industry [23], food industry [24], biological industry [25], agriculture [26], etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the separation performance of a novel sewage hydrocyclone used in sewage source heat pump

Tian

Shen

et al. 2016

Applied Thermal Engineering

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“…When used for dewatering, the more concentrated solids product leaves through the spigot, whereas the clarified product leaves through the vortex finder. A remarkable advantage of small hydrocyclones is that the bypass, the fraction of particles that goes directly to the underflow without classification, is higher than the water recovery to the underflow [6]. However, the commercial availability of small hydrocyclones is typically limited to specific shapes and outlet diameters, which can result in sub-optimal performance.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, studies have been performed in small hydrocyclones focussing only on design parameters. It has been shown that for 10 mm hydrocyclones using silica flour as the particulate system, changes in vortex finder and spigot diameters resulted in different classification performance, although in all cases exhibiting significant bypass [6]. The effect of vortex finder diameter, cone angle and inlet diameter on the separation performance of yeast suspensions in 10 mm hydrocyclones has also been investigated [11] using a 3 × 3 full factorial experimental design.…”

Section: Introductionmentioning

confidence: 99%

Optimising small hydrocyclone design using 3D printing and CFD simulations

Vega-Garcia

Brito-Parada

Cilliers

2018

Chemical Engineering Journal

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• CFD and 3D printing used for rapid manufacturing of small hydrocyclones.• Experimental and computational studies combined to assess hydrocyclone design.• Novel design with parabolic walls shown to significantly improve separation.• A methodology is presented to optimize hydrocyclone performance through design. A R T I C L E I N F O Keywords:Small hydrocyclone Yeast Simulation 3D printing Dewatering A B S T R A C T The use of small hydrocyclones for the separation of particles in the micron range is of growing interest. However, these hydrocyclones are typically limited to conventional shapes or restricted to specific outlet sizes, which can lead to sub-optimal performance. The aim of this study is to present a method for the optimisation of small hydrocyclone design. This method consists of four steps that combine designing, Computational Fluid Dynamics (CFD) simulations, 3D printing and experimental testing. A 3D printed 10 mm hydrocyclone was shown first to match the performance of a ceramic equivalent, followed by factorial experiments with a set of printed hydrocyclones of different spigot and vortex finder diameters. A CFD model for small hydrocyclones was implemented and, following validation with the experimental data, used to simulate small hydrocyclone designs with parabolic walls. The model predicted improved separation performance compared to the conventional conic wall designs. In a novel development, a 10 mm hydrocyclone with parabolic walls was 3D printed and the prediction confirmed experimentally. The solids recovery and concentration ratio were increased by 10 percentage points and 0.2, respectively, for a 0.5 g/L yeast suspension and at an equivalent pressure drop. The use of 3D printing to manufacture small hydrocyclones of various designs has been proven in this study to be practical and to allow rapid prototyping design informed by CFD simulations. This is a significant improvement in the cost, time and versatility associated to hydrocyclone design and can lead to enhanced separation performance.

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Sub-micron particle dewatering using hydrocyclones

Cited by 59 publications

References 10 publications

Optimization of Comminution Circuit Throughput and Product Size Distribution by Simulation and Control

Optimization of Comminution Circuit Throughput and Product Size Distribution by Simulation and Control

Experimental study of the separation performance of a novel sewage hydrocyclone used in sewage source heat pump

Optimising small hydrocyclone design using 3D printing and CFD simulations

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