Imperial College London
Portrait Picture

ProfessorStephenNeethling

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Minerals Processing
 
 
 
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Contact

 

+44 (0)20 7594 9341s.neethling

 
 
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Location

 

RSM 2.35Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

126 results found

Meloy JR, Neethling SJ, Cilliers JJ, 2007, Modelling the axial dispersion of particles in froths, INTERNATIONAL JOURNAL OF MINERAL PROCESSING, Vol: 84, Pages: 185-191, ISSN: 0301-7516

Journal article

Neethling SJ, 2006, Effect of simple shear on liquid drainage within foams (vol 73, pg 061408, 2006), PHYSICAL REVIEW E, Vol: 74, ISSN: 1539-3755

Journal article

Wang Y, Neethling SJ, 2006, Simulating realistic froth surfaces, MINERALS ENGINEERING, Vol: 19, Pages: 1069-1076, ISSN: 0892-6875

Journal article

Neethling SJ, 2006, Effect of simple shear on liquid drainage within foams, PHYSICAL REVIEW E, Vol: 73, ISSN: 1539-3755

Journal article

Neethling SJ, Hadler K, Cilliers JJ, Stradling AWet al., 2006, The use of FrothSim to optimise the water addition to a column flotation cell, MINERALS ENGINEERING, Vol: 19, Pages: 816-823, ISSN: 0892-6875

Journal article

Grassia P, Neethling SJ, Cervantes C, Lee HTet al., 2006, The growth, drainage and bursting of foams, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, Vol: 274, Pages: 110-124, ISSN: 0927-7757

Journal article

Neethling SJ, Hadler K, Cilliers JJ, Stradling AWet al., 2005, The use of FrothSim to optimise the water addition to a column flotation cell, Australasian Institute of Mining and Metallurgy Publication Series, Pages: 159-164

This paper examines the use of the FrothSim flotation simulator to improve the performance of an industrial column flotation cell. The performance of an industrial retreat column cell is simulated, and, from the discrepancies between the simulated and experimental results, a problem with the wash water distribution is postulated. The scientific reason for the reduced performance with uneven wash water addition is described in detail. Further simulations indicated the potential for improvement with an even wash water distribution, resulting in both improved performance and reduced wash water usage. The simulated uneven wash water distribution was confirmed industrially, and the headers were redesigned and installed. A sampling campaign to compare the performance before and after the modifications showed that the flotation performance was improved dramatically, with a statistically significant decrease in gangue recovery, without a commensurate reduction in valuable mineral recovery.

Journal article

Neethling SJ, Cilliers JJ, 2005, The simulation of flotation banks and circuits, Australasian Institute of Mining and Metallurgy Publication Series, Pages: 153-158

The aim of this paper is to give an overview of the FrothSim flotation simulator and to demonstrate its ability to predict the performance of real flotation circuits. Example simulations are presented in which the feed rate to the circuit is varied, followed by simulations in which a cleaner section and recycle loop are added to the rougher bank. The simulator is able to predict both the recovery and the grade produced by the cells at all locations in a circuit and the simulator is shown to produce plausible grade recovery curves. It also demonstrated that the performance of banks of cells improve as the feed rate to the bank increased (improved grade for a given recovery), but that more cells are required to give the same overall recovery.

Journal article

Spyridopoulos MT, Simons SJR, Neethling SJ, Cilliers JJet al., 2005, Bubble coalescence behaviour in dissolved air flotation froths, Australasian Institute of Mining and Metallurgy Publication Series, Pages: 923-929

In this paper the effect of humic substances (natural surfactants), electrolytes and solid particles on bubble coalescence, and as a consequence on froth stability, have been investigated. In this study two bubbles of equal size were formed and forced to collide using a novel experimental apparatus. The interactions were recorded by a high-speed camera, the images of which helped to determine the coalescence frequency and the coalescence time, as well as the mechanisms of the interactions. Two types of humic substances were used, along with three different electrolytes. Humic substances appeared to have a considerable effect on bubble coalescence, while the effect of electrolytes was minimal. Moderate and high hydrophobic glass spheres were used between two bubbles. Very hydrophobic spheres promoted fast bubble coalescence, while moderate hydrophobic spheres had no effect. Data of coalescence frequency and time is presented, as well as images of the coalescence events. The coalescence frequency was used to validate a parameter, Pf, known as the film failure frequency, used in a simulation model to predict foam height in a gas-sparged vessel. Predictions determined using Pf were then validated by experimentation.

Journal article

Neethling SJ, Lee HT, Grassia P, 2005, The growth, drainage and breakdown of foams, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, Vol: 263, Pages: 184-196, ISSN: 0927-7757

Journal article

Lee HT, Neethling SJ, Cilliers M, 2005, Particle and liquid dispersion in foams, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, Vol: 263, Pages: 320-329, ISSN: 0927-7757

Journal article

Grassia P, Neethling SJ, 2005, Quasi-one-dimensional and two-dimensional drainage of foam, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, Vol: 263, Pages: 165-177, ISSN: 0927-7757

Journal article

Neethling S, Cilliers J, 2005, Rising to the top, TCE, Pages: 26-28, ISSN: 0302-0797

Journal article

Grassia P, Neethling SJ, 2004, Iterative approach to weir drainage, CHEMICAL ENGINEERING SCIENCE, Vol: 59, Pages: 4349-4359, ISSN: 0009-2509

Journal article

Cox SJ, Neethling S, Rossen WR, Schleifenbaum W, Schmidt-Wellenburg P, Cilliers JJet al., 2004, A theory of the effective yield stress of foam in porous media: the motion of a soap film traversing a three-dimensional pore, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, Vol: 245, Pages: 143-151, ISSN: 0927-7757

Journal article

Xie W, Neethling SJ, Cilliers JJ, 2004, A novel approach for estimating the average bubble size for foams flowing in vertical columns, CHEMICAL ENGINEERING SCIENCE, Vol: 59, Pages: 81-86, ISSN: 0009-2509

Journal article

Spyridopoulos M, Simons S, Neethling SJ, Cilliers JJet al., 2004, Effect of humic substances and particles on bubble coalescence and foam stability in relation to dissolved air flotation processes, Physicochemical Problems of Mineral Processing, Vol: 38, Pages: 37-52, ISSN: 0137-1282

Journal article

Neethling SJ, Lee HT, Cilliers JJ, 2003, Simple relationships for predicting the recovery of liquid from flowing foams and froths, MINERALS ENGINEERING, Vol: 16, Pages: 1123-1130, ISSN: 0892-6875

Journal article

Neethling SJ, Cilliers JJ, 2003, Modelling flotation froths, INTERNATIONAL JOURNAL OF MINERAL PROCESSING, Vol: 72, Pages: 267-287, ISSN: 0301-7516

Journal article

Neethling SJ, Lee HT, Cilliers JJ, 2003, The recovery of liquid from flowing foams, JOURNAL OF PHYSICS-CONDENSED MATTER, Vol: 15, Pages: 1563-1576, ISSN: 0953-8984

Journal article

Grassia P, Neethling SJ, Cilliers JJ, 2002, Foam drainage on a sloping weir, EUROPEAN PHYSICAL JOURNAL E, Vol: 8, Pages: 517-529, ISSN: 1292-8941

Journal article

Neethling SJ, Cilliers JJ, 2002, The entrainment of gangue into a flotation froth, INTERNATIONAL JOURNAL OF MINERAL PROCESSING, Vol: 64, Pages: 123-134, ISSN: 0301-7516

Journal article

Neethling SJ, Cilliers JJ, 2002, Solids motion in flowing froths, CHEMICAL ENGINEERING SCIENCE, Vol: 57, Pages: 607-615, ISSN: 0009-2509

Journal article

Neethling SJ, Lee HT, Cilliers JJ, 2002, A foam drainage equation generalized for all liquid contents, JOURNAL OF PHYSICS-CONDENSED MATTER, Vol: 14, Pages: 331-342, ISSN: 0953-8984

Journal article

Neethling SJ, Cilliers JJ, 2001, The physical modeling of foam and froth behavior, CHEMICAL ENGINEERING & TECHNOLOGY, Vol: 24, Pages: 1309-1312, ISSN: 0930-7516

Journal article

Grassia P, Cilliers JJ, Neethling SJ, Ventura-Medina Eet al., 2001, Quasi-one-dimensional foam drainage, EUROPEAN PHYSICAL JOURNAL E, Vol: 6, Pages: 325-348, ISSN: 1292-8941

Journal article

Neethling SJ, Cilliers JJ, 2001, Simulation of the effect of froth washing on flotation performance, CHEMICAL ENGINEERING SCIENCE, Vol: 56, Pages: 6303-6311, ISSN: 0009-2509

Journal article

Grassia PS, Cilliers JJ, Neethling SJ, 2001, The foam geometry "paradox", CANADIAN JOURNAL OF PHYSICS, Vol: 79, Pages: 1265-1281, ISSN: 0008-4204

Journal article

Cilliers JJ, Xie W, Neethling SJ, Randall EW, Wilkinson AJet al., 2001, Electrical resistance tomography using a bi-directional current pulse technique, MEASUREMENT SCIENCE AND TECHNOLOGY, Vol: 12, Pages: 997-1001, ISSN: 0957-0233

Journal article

Neethling SJ, Cilliers JJ, Woodburn ET, 2000, Prediction of the water distribution in a flowing foam, CHEMICAL ENGINEERING SCIENCE, Vol: 55, Pages: 4021-4028, ISSN: 0009-2509

Journal article

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