Aggregate size and density after shearing, implications for dewatering fine tailings with hydrocyclones

Franks, George V.; Yates, Peter D.; Lambert, Noel; Jameson, Graeme J.

doi:10.1016/j.minpro.2005.02.002

Cited by 18 publications

(7 citation statements)

References 6 publications

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“…Satisfactory separation of dispersed fine solids from water in a hydrocyclone has been difficult due to a lack of generating sufficiently clear overflow (Franks, et al, 2005;Consortium of Tailings Management Consultants, 2012). Recent developments suggest that improvements may be achieved with hydrocyclone units in smaller diameter (Yang, et al, 2013), or operated under modified process conditions, e.g., cyclic flow (Zhao, et al, 2008), and application of an electric field (Nenu, et al, 2010), though care must be taken to avoid underflow blockage for small units.…”

Section: Hydrocyclonesmentioning

confidence: 99%

Current state of fine mineral tailings treatment: A critical review on theory and practice

Wang

Harbottle

Liu

et al. 2014

Minerals Engineering

332

169

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Highlights Presented facts on escalating generation of fine mineral tailings worldwide.  Overview of coal, alumina, oil sands, and base metals tailings characteristics.  Reviewed theoretical and industrial developments for tailings management.  Determined numerous knowledge gaps between current theories and practices.  Identified opportunities for improvement towards more sustainable practices. Graphical AbstractEvolution of fine mineral tailings treatment objectives.Figures "Flocculated solids" and "Stackable solids" are adopted from Alamgir, et al. (2012), permission pending. The last figure "Reclaimed land" is adopted from Golder Associates (2009), permission pending. AbstractThe mining industry produces fluid fine mineral tailings on the order of millions of tonnes each year, with billions of tonnes already stored globally. This trend is expected to escalate as demand for mineral products continues to grow with increasingly lower grade ores being more commonly exploited by hydrometallurgy. Ubiquitous presence and enrichment of fine solids such as silt and clays in fluid fine mineral tailings prevent efficient solid-liquid separation and timely re-use of valuable process water. Long-term storage of such fluid waste materials not only incurs a huge operating cost, but also creates substantial environmental liabilities of tailings ponds for mining operators. This review broadly examines current theoretical understandings and prevalent industrial practices on treating fine mineral tailings for greater water recovery and reduced environmental footprint of mining operations.

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Section: Hydrocyclonesmentioning

confidence: 99%

Current state of fine mineral tailings treatment: A critical review on theory and practice

Wang

Harbottle

Liu

et al. 2014

Minerals Engineering

332

169

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“…When shear rate increases further to γ*=5.0, the broken cluster again becomes smaller, frequency of the clusters continuously drops to 3%, and the position of the large clusters again shifts to the smaller direction. This changing trend of CSDs as shear [18]. Fig.2 shows effects of different ionic concentrations on CSDs in uni-polar systems.…”

Section: Average Cluster Sizes (Acss)mentioning

confidence: 88%

Average cluster sizes and cluster size distributions of superfine nickel particles in light media

Wang

2009

J. Cent. South Univ. Technol.

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Effects of shear rates on average cluster sizes (ACSs) and cluster size distributions (CSDs) in uni-and bi-systems of partly charged superfine nickel particles were investigated by Brownian dynamics, and clustering properties in these systems were compared with those in non-polar systems. The results show that the ACSs in bi-polar systems are larger than those in the non-polar systems. In uni-polar systems the behavior of clustering property differs: at the lower ionic concentration (10%), repulsive force is not strong enough to break clusters, but may greatly weaken them. The clusters are eventually cracked into smaller ones only when concentration of uni-polar charged particles is large enough. In this work, the ionic concentration is 20%. The relationship between ACS and shear rates follows power law in a exponent range of 0.176−0.276. This range is in a good agreement with the range of experimental data, but it is biased towards the lower limit slightly.

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“…A few studies [16][17][18] have focused on the shear distribution and the effect of shear stress on the movement and surface properties of dispersed particles. George et al [17] measured the average shear rates survived by flocs in a concentric cylinder shear cell to simulate the cylindrical segment of hydrocyclones. However, the average shear values did not adequately describe the real flow field.…”

Section: Introductionmentioning

confidence: 99%

Effect of Shear Stress on Deoiling of Oil‐Contaminated Catalysts in a Hydrocyclone

Liu

Zhang

et al. 2016

Chem Eng & Technol

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Shear stress provided by a hydrocyclone was employed to remove the oil from oilcontaminated catalysts. Understanding the deoiling mechanism and quantitative analysis of the interaction between shear stress fields and deoiling are necessary to improve deoiling efficiency. A numerical simulation was conducted for the velocity field and shear stress field of a hydrocyclone. The shear stress field in the wall layer, where oil-contaminated catalysts are usually located, was robust. Increasing inlet flow rates resulted in a higher shear rate distribution along the wall layer. Numerical results were compared with experimental data. In the deoiling process, higher shear stress rates promoted faster transport of oil from catalysts into the fluid, thereby increasing the deoiling efficiency. Deoiling by the shear stress of a hydrocyclone is an efficient method for cleaning oil-contaminated catalysts within a short time.

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Aggregate size and density after shearing, implications for dewatering fine tailings with hydrocyclones

Cited by 18 publications

References 6 publications

Current state of fine mineral tailings treatment: A critical review on theory and practice

Current state of fine mineral tailings treatment: A critical review on theory and practice

Average cluster sizes and cluster size distributions of superfine nickel particles in light media

Effect of Shear Stress on Deoiling of Oil‐Contaminated Catalysts in a Hydrocyclone

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