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Tesis sobre el tema "Froth flotation"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de julio de 2025

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1

Hanumanth, G. S. "Froth flotation of china clay." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637217.

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An experimental and theoretical study of froth flotation separation of kaolinite from other associated minerals of china clay is presented herein. A new laboratory flotation equipment has been designed and built for the above study. Its novel features are discussed. Effects of physico-chemical variables such as pH, initial solid concentration of feed, froth height and air flowrate are studied by systematically carrying out series of semi-batch kinetic experiments. pH is shown to influence both recovery and grade of the product. The effects of pH are interpreted in terms of particle/particle in

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2

Kaya, Muammer. "Froth washing in mechanical flotation cells." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74232.

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This basic research project was aimed at assessing the potential of wash water for mechanical flotation machines. Test work at laboratory scale first examined the nature of entrainment; froth structures with and without wash water; and the location, geometry, and flowrate of wash water addition. The relationship between slurry, total water recovery and gangue recovery was characterized. Confirmatory work at pilot plant was completed.<br>The effect of wash water on metallurgical performance was tested with various streams from the Falconbridge Strathcona mill at laboratory and pilot and full pl

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3

Kelley, Kyle. "Model-based Computer Simulation of Froth Flotation." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76850.

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Froth flotation is a separation process by which particles are selectively attached to air bubbles. It is one of the most dynamically complex industrial processes in use today. This complexity has steered research towards understanding the fundamental principles of the process. Relatively few researchers have successfully attempted to create a flotation simulator based on first principles. This thesis presents the development and testing of a simulator called SimuFloat, which is based on the flotation model developed at Virginia Tech. Flotation of chalcopyrite, coal, and phosphate are sim

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4

Henwood, Daryl. "The effect of conditioning on froth flotation." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/21416.

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Bibliography: pages 154-159.<br>The method and extent to which mineral slurries are conditioned have been shown to greatly affect flotation grades and recovery. Most of this work is very mineral specific and centres around one or two operating variables. One of the major obstacles to understanding the effects of such pretreatment more fully, and to developing a global understanding of conditioning, is the system specific nature of the procedures applied to each mineral, and the apparently conflicting results across a range of mineral types. This thesis sets out to define conditioning both broa

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5

Zhang, Jian-Gou. "Factors affecting the kinetics of froth flotation." Thesis, University of Leeds, 1989. http://etheses.whiterose.ac.uk/3305/.

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In this research work, three types of flotation models (discrete, mean rate and the gamma function models) are modified based on the relationship between mass recovery and recovery. The modified models can be used to calculate both the recovery and grade of concentrate. Experimental work was carried out by using three different samples, which are chalcopyrite, coal and complex sulphide. In the chalcopyrite and coal flotation, air flow rate (AFR) was varied and different size fractions were considered in coal flotation. In complex sulphide flotation, the impeller speed (IPS) and air flow rate w

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6

Riaz, Muhammad. "An electrochemical investigation of synergism in froth flotation." Thesis, Brunel University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257547.

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7

Shumba, Tanaka Casandra. "Relationship between flotation operational factors and froth behaviour." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9127.

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Includes bibliographical references.<br>This study utilised laboratory-scale column flotation experiments to investigate froth stability, with respect to, water recovery and top-of-froth bubble burst rate. Tests were conducted at different froth heights, superficial air rates and depressant dosages in a 2 m high Plexiglass column, using a PGM bearing UG2 ore from the Bushveld Igneous Complex. Four concentrate and tailings samples were simultaneously collected and solids and water recoveries were determined. Assays of the concentrates were conducted to establish the amount of platinum, palladiu

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8

Kaushik, Sarthak. "Surface properties of crandallite in relation to froth flotation." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42550.

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The surface properties of crandallite relevant to the anionic flotation of salt-type minerals were investigated through electrokinetic, turbidity, and wettability techniques. All the tests were performed on fine crandallite particles as a function of pH and reagent concentration. The selected reagents included starch and oleic acid. From the zeta potential measurements, the iso-electric point of crandallite was found to be at pH 5.5 and the mineral surface can be expected to be negatively charged under typical flotation conditions (pH 9-11). The value of the iso-electric point correlated well

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9

Noble, Christopher Aaron. "Laboratory-Scale Analysis of Energy-Efficient Froth Flotation Rotor Design." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/76881.

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Froth Flotation is an industrial separation process commonly used in the primary enrichment of run-of-mine mineral material. Over the past 100 years, much of the process's development has come from empirical evolution, rather than fundamental understanding. While many of the governing sub-processes are still poorly understood, the primary influential factors lie within the chemical, equipment, and operational variables unique to each flotation system. This investigation focuses on the phenomenological investigation of the equipment variables, particularly the rotor design, at the laboratory

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10

Ramberg, J. (Juhani). "Effect of the reagents and minerals on froth electrical conductivity in pilot scale froth flotation process." Master's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201601131001.

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This thesis studies how the changes to the flotation process caused by adjusting pH and the dosage of the flotation reagents affect the electrical conductivity of the froth flotation froth in different parts of the froth. The measurements in the experimental part were done in Oulu Mining School’s continuous minipilot beneficiation plant at the University of Oulu in March and May of 2015. The conductivity of the froth was measured with Outotec’s ERT (Electrical Resistance Tomography) based test probe. The probe was placed inside the 4-litre flotation cell that acted as a rougher in copper refin

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11

Vera, Marco A. "A touch of froth : how bubble-particle aggregates take the strain; an investigation into aspects of froth zone recovery in mineral flotation /." St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16112.pdf.

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12

Maree, Westhein Bethren. "Froth flotation of an Nkomati mineral ore using mixtures of thiol collectors." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2512.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2016.<br>Nickel, a valuable base metal, is the predominant product from the Nkomati mine in South Africa. High-grade nickel mineral ores (2%) from the Massive Sulphide Body have been depleted leaving those of low grade (0.3%). The beneficiation of this ore presents a challenge to the minerals processing industry. In response, batch froth flotation tests were used to explore the effects of mixtures of potassium amyl xanthate (PAX) and IPETC (Isopropyl ethyl thionocarbamate) on the grades and recoveries of nickel. In

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13

Knapp, Jennifer Mary Smith. "A study of floatation froth behavior." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41996.

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<p>In order to develop a better understanding of the role of the froth phase in coal flotation, froth stability measurements have been conducted using a continuous flotation cell. The results indicate that the mass flow rate of coal or mineral matter reporting to the product is linearly related to the flow rate of water reporting to the product. This relationship has been used to distinguish the relative contributions of hydrophobic attachment or hydraulic entrainment to the total product recovery. Simple mathematical expressions have also been developed to characterize the cleanability of var

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14

Wright, Benedict Anson. "The Development of a vision-based flotation froth analysis system." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/9899.

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Bibliography : leaves157-163.<br>This dissertation describes the development of a machine vision system for the on-line analysis of flotation froth images. The size and shape of bubbles that constitute the flotation froth convey considerable information on the performance of the flotation process. A method whereby this size and shape information can be automatically extracted from froth images is highly desirable. In this research, a system was developed which acquires froth image using a video camera, and then rapidly identifies the bubbles in the froth by segmenting the image using a morphol

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15

Zhang, Jian. "Prediction and Influence of Mineral Liberation on Froth Flotation Performance." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/68364.

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Liberation of valuable mineral is essential for its effective separation from gangue. Prediction of liberation requires quantification of texture of the rock and structure of the progeny particles in terms of probability functions. In this work, predictive liberation models have been developed by measuring these functions from SEM images using Labview™ software. A transformation matrix model that explicitly incorporates mineral liberation has also been developed to quantify the influence of mineral liberation on flotation performance.

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16

McKeon, Timothy Josiah. "An In-Plant Evaluation of Froth Washing on Conventional Flotation Cells for Coal." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35708.

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Column flotation cells have become increasingly popular in the coal industry due to their ability to improve flotation selectivity. The improvement can be largely attributed to the use of froth washing, which minimizes the nonselective entrainment of ultrafine minerals matter into the froth product. Unfortunately, the practice of adding wash water in conventional flotation machines has been largely unsuccessful in industrial trials. In order to better understand the causes of these failures, a detailed in-plant test program was undertaken to evaluate the use of froth washing at an operating

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17

Ramagwede, Mudzimba Hubert. "The sulphidization of mineral surfaces as applied to the froth flotation process." Thesis, Rhodes University, 1988. http://hdl.handle.net/10962/d1004590.

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This work constitutes a fundamental study of the interaction between soluble sulphide,copper (II) oxide and cerussite particles in the presence of Ca²⁺ ,Mg²⁺ starch , gum arabic and Triton X- IOO . A detailed investigation of the effect of pH of the system on the rate of sulphide uptake was made . In addition , the structural form of the surface precipitat.es were determined with the aid of scanning electron microscopy . On the basis of these results , it was concluded that adsorption of sulphide on cerussite in the presence or absence of Ca²⁺ starch, gum arabic and Triton X-IOO could either l

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18

Stallard, Michael L. "Precombustion desulfurization of coal by photochemical methods and pyrite depression in froth flotation." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07132007-143147/.

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19

May, Frank [Verfasser]. "Froth flotation improvement by plasma pretreatment of sulfide minerals / Frank May." Greifswald : Universitätsbibliothek Greifswald, 2014. http://d-nb.info/1053953003/34.

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20

O'Connell, Barrie Christopher. "Selective wetting and separation of PET and PVC by froth flotation." Thesis, University of Exeter, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269663.

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21

Morrison, Angus James. "Tank design modifications for the improved performance of froth flotation equipment." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/61631.

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Froth flotation is a physico-chemical technique used to separate the constituents of a mixed mineral slurry by their relative surface hydrophobicity. In order to do so economically, it is necessary to treat large volumes of material in ever-larger and more efficient tanks. The efficiency and efficacy of such tanks can be enhanced through mechanical modifications designed to improve froth handling, increase the likelihood of bubble-particle interactions in the pulp, and increase the residence time of suspended solids in the tank. However, design modifications suggested by computational modellin

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22

Sadr-Kazemi, Naheed. "Estimation of coal flotation performance and froth properties using image processing." Thesis, University of Manchester, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.682189.

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Reagent concentration is an important factor in froth flotation. It is also known that the froth structure plays an important role in the flotation separation achieved. The effect of surfactant concentration, conditioning time, pH and adsorption of a single reagent on froth structure and flotation performance was studied in a HaIIimond tube (micro scale) and Denver cell (macro scale). The surfactant concentration was found to be important factors in determining froth structure and stability. The appearance of the upper bubble surface of flotation froths is used qualitatively as a basis for con

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23

Uusi-Hallila, S. (Senni). "Utilizing froth phase behaviour and machine vision to indicate flotation performance." Master's thesis, University of Oulu, 2014. http://urn.fi/URN:NBN:fi:oulu-201404161276.

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Flotation is one of the most well-known mineral separation methods. In flotation process hydrophobicity of the solids is manipulated in order to separate the valuable minerals from the gangue. It is highly complex process because many simultaneous sub-processes and interactions occur within the system. It is essential to have a good understanding and representation of the flotation phenomena in order to design control strategies. Modern physical froth stability measures have an intrusive nature and therefore they are not practical to provide a continuous online froth stability measurement. Un

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24

Sheni, Nanji Ruth. "Considering the effect of pulp chemistry during flotation on froth stability." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22940.

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On an industrial scale the need for improved flotation performance is of high importance in the current economic climate. Studies have shown that the pulp phase chemistry has a strong effect on the froth phase and therefore it is necessary to investigate how the manipulation of pulp chemistry factors can improve flotation performance. Research into the manipulation of this chemistry is well underway and factors including the pulp potential (Eh), pH, dissolved oxygen (DO) and ionic strength (IS) govern the pulp chemistry. This study aims to investigate how the manipulation of these factors affe

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25

Fickling, Ronald Sidney. "An investigation into the froth flotation of four South African coals." Master's thesis, University of Cape Town, 1985. http://hdl.handle.net/11427/22398.

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Bibliography: pages 130-136.<br>Froth flotation is used extensively throughout the world to beneficiate fine (-0,5 mm) coal. However when the same technology is applied to the majority of South African coals it has proved relatively unsuccessful. As the beginning of an ongoing research program, this thesis examines the effects of basic flotation parameters on the beneficiation by flotation, of four South African coals, to identify research areas where a more in-depth investigation is needed. An important conclusion is that South African coals are floatable, and flotation selectivity can be obt

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26

Hatfield, Douglas. "The implications of froth structure and surface appearance for flotation performance." Doctoral thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5321.

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Includes bibliographical references (p. 166-170).<br>In this work, the flotation step of mineral extraction has been investigated to determine the mechanisms through which input variables impact on flotation separation efficiency and, in particular, the froth zone in flotation. The novel contribution of the work is in terms of demonstrating the importance of solids in governing the froth stability and hence the froth structure. Further, it has been propsed that the two most important factors that determine the impact of the solids on the froth are the degree of particle coverage on the bubble

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27

Hassan, Ghanim. "Minimizing bacterial biofilm in water using froth flotation and shock chlorination." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/9723/.

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Microorganisms in potable water systems are either present in the planktonic “floating stage”, or attached to surfaces, usually as biofilm. Many hygienic and economic problems are attributed to this phenomenon. Through the last seven or so decades many trials were made to overcome biofilm problems. Unfortunately, biofilm prevention stills a premature field of science. Therefore, serious solutions with new horizons are needed. The objective of this study is to provide a water distribution system which is free of microorganisms, both in the planktonic and biofilm stages, and biocides. The two co

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28

Kloppers, Lourens Marthinus. "Froth flotation of a Merensky platinum bearing ore with various THIOL collectors and their mixtures." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2481.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2016.<br>The Bushveld igneous complex in northern South Africa has the largest deposit of platinum group elements (PGE) in the world. In trace amounts, these are closely associated with base metal sulphides (BMS). Froth flotation is used to beneficiate these PGE ores. The process constitutes a bulk sulphide recovery. Improvement of recovery of the BMS is required to maximise the recovery of PGEs. The performance of the froth flotation process is largely dependent on the chemical additives used and these chemic

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29

Miskovic, Sanja. "An Investigation of the Gas Dispersion Properties of Mechanical Flotation Cells: an In-Situ Approach." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/30223.

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Bubble size is considered to be one of the most important parameters affecting the performance of froth flotation cells. However, monitoring, controlling and predicting bubble size is a very challenging task. This dissertation presents results obtained from a comprehensive pilot- and industrial-scale experimental investigation of gas dispersion performance of two commercially available flotation cells. To facilitate this investigation, a continuous pilot-scale flotation system was developed and tested. The results of the hydrodynamic and metallurgical testing conducted on the pilot-scale flota

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30

Goodall, Craig Michael. "The effects of flotation variables on the bubble size, mixing characteristics and froth behaviour in column flotation cells." Thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/23802.

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31

Hunter, C. J. "An electrochemical investigation of the froth flotation of iron bearing sulphide minerals." Thesis, Brunel University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.351913.

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32

Saracoglu, Mehmet. "FROTH FLOTATION PERFORMANCE ENHANCEMENT BY FEED CAVITATION AND MAGNETIC PLASTIC PARTICLE ADDITION." UKnowledge, 2013. http://uknowledge.uky.edu/mng_etds/9.

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Froth flotation is the most commonly used process to recover and upgrade the portion of the coal preparation plant feed that has a particle size smaller than 150 microns. Problems that occur when employing froth flotation in the coal industry include i) coal surfaces that are weakly-to-moderately hydrophobic, and ii) flotation systems that are overloaded and limited by insufficient retention time. Research was performed to evaluate techniques that could be implemented to improve flotation performance under the aforementioned scenarios. Pre-aeration of flotation feed using a cavitation system w

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33

Marais, Corne. "Estimation of concentrate grade in platinum flotation based on froth image analysis." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5346.

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Thesis (MScEng (Process Engineering))--University of Stellenbosch, 2010.<br>Thesis presented in partial fulfilment of the requirements for the degree MASTER OF SCIENCE IN ENGINEERING (EXTRACTIVE METALLURGICAL ENGINEERING) in the Department of Process Engineering at the University of Stellenbosch<br>ENGLISH ABSTRACT: Flotation is an important processing step in the mineral processing industry wherein valuable minerals are extracted. Flotation is a difficult process to control due to its complexity, meaning that the reversal of series of changes will not necessarily bring the process back

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34

Fuenzalida, González Octavio Francisco. "Model predictive control of froth flotation processes aided by a dynamic simulator." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/150812.

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Magíster en Ciencias de la Ingeniería, Mención Metalurgia Extractiva<br>A model and simulation based methodology is used to implement a multi-layer model predictive control (MPC) strategy for a rougher row of mechanical flotation cells. Pilot-scale tests are done to calibrate and validate both the process simulation models and the predictive simulation models. The hierarchical control strategy considers three layers: orchestrator, advanced control and basic control; is deployed, in a commercial control system and, tested in a pilot row. The orchestrator is divided in two: the row supervisor a

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35

Kharva, Mohamed. "Monitoring of froth systems using principal component analysis." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52945.

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Thesis (MScEng)--Stellenbosch University, 2002.<br>ENGLISH ABSTRACT: Flotation is notorious for its susceptibility to process upsets and consequently its poor performance, making successful flotation control systems an elusive goal. The control of industrial flotation plants is often based en the visual appearance of the froth phase, and depends to a large extent on the experience and ability of a human operator. Machine vision systems provide a novel solution to several of the problems encountered in conventional flotation systems for monitoring and control. The rapid development in co

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36

Sayed, Ahmed Ahmed S. "CAVITATION NANOBUBBLE ENHANCED FLOTATION PROCESS FOR MORE EFFICIENT COAL RECOVERY." UKnowledge, 2013. http://uknowledge.uky.edu/mng_etds/8.

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Froth flotation is a widely used, cost effective particle separation process. However, its high performance is limited to a narrow particle size range, e.g., between 50 µm and 600 µm for coal and between 10 µm and 100 µm for minerals. Outside this range, the efficiency of froth flotation decreases significantly, especially for difficult-to-float particles of weak hydrophobicity (e.g., oxidized coal). Nanobubbles integrated into a specially designed column flotation expanded the particle size range for efficient froth flotation as a result of increased probabilities of particle- bubble collisio

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37

Ur, Rehman Bilal. "Modelling a Mineral Froth Flotation Process : Case Study: Minerals process at Boliden AB." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-51600.

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We present an approach to model the dynamic of a copper flotation process. The conventional approach of system identification is applied to model the dynamics. In this research, experiments are performed to collect process data of determined input and output variables. It is followed by data pre-processing to handle outliers and to remove high frequency disturbances. Simulation and validation responses of linear estimated models, which captured the dynamic of the process, are presented. The long term goal is to use estimated models to design a models-based control system.

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38

Mozaffari, Ezatollah. "A study of coarse particle recovery by froth flotation in the Jameson cell." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263391.

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39

Forbes, Gordon. "Texture and bubble size measurements for modelling concentrate grade in flotation froth systems." Doctoral thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/9247.

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Includes bibliographical references (p. 237-244).<br>Numerous, machine vision systems for froth flotation have been developed over the last ten years; however, there are many aspects of the systems, that still require further development before they become one of the standard instruments present on industrial flotation operations. This thesis aims to address these problems by developing improved measurement techniques and showing how these measurements can be used to model the concentrate grad e of the flotation cell being monitored in a manner which is, directly usable by plant personnel. Thi

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40

Quinn, Jarrett. "Exploring the effects of salts on gas dispersion and froth properties in flotation systems." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99532.

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Several mineral flotation plants utilize process water with high soluble salt content. The processing of soluble minerals, the use of recycle streams, sea or well water give rise to this situation. It is unclear as to the overall effect on flotation response though there does seem to be evidence of bubble size reduction, increased froth stability and reduced reagent dosage. The present work aims to quantify the effects of salts commonly present in process water on gas dispersion (bubble size and gas holdup) and froth properties (solid and liquid overflow rates) and to compare to a typical frot

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41

Siame, Edward. "Recovery of lithium from china clay waste using a combination of froth flotation, magnetic separation, roasting and leaching." Thesis, University of Exeter, 2011. http://hdl.handle.net/10036/3096.

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This study was aimed at recovering lithium from china clay waste using a combination of froth flotation, magnetic separation, roasting and leaching. The china clay waste produced by Goonvean Ltd contains about 0.84% Li2O and 0.36% Rb2O, present in some of the mica minerals. Among the mica minerals, zinnwaldite is the major source of lithium with smaller amounts being contributed by muscovite. The results of the flotation tests showed that the dodecylamine collector dosage had a greater effect on the recovery and grade of mica minerals to concentrate than pH over the range tested. It was found

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42

Kaya, Muammer. "The effect of air flow rate and froth thickness on batch and continuous flotation kinetics /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63358.

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43

Mathe, Z. T. "Modelling the influence of the froth phase on recovery in batch and continuous flotation cells." Doctoral thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/10851.

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To determine model parameters, a large data set was required. This is due to the semi-empirical nature of the proposed froth model. In this regard, the use of data obtained from continuously operated cells was therefore not suitable for deriving model parameters. It was thought that this could only be achieved by using data obtained from a batch flotation cell. A batch flotation cell has a distinct advantage of being suitable for generating, rapidly, large amount of data. However, the non-steady behaviour of froths found in this type of cell require a robust methodology for extracting the nece

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44

Moimane, Tiisetso Makheane. "Investigation of the effect of the reagent suite in froth flotation of a Merensky ore." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/20088.

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The mining industry is faced with a challenge to develop efficient and economically feasible processing routes owing to the depletion of high-grade ores, and the ever increasing demand for precious metals for a wide range of applications. The valuable minerals, PGMs (Platinum Group Minerals) and BMS (Base Metal Sulphides) in the ores are extracted through the aid of chemical reagents (activators, collectors, depressants, frothers, modifiers) which are added to the flotation circuits to facilitate the separation between these minerals and the undesired gangue minerals present in the ore. The pr

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45

Do, Hyunsun. "Development of a turbulent flotation model from first principles." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/28285.

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Flotation is a process of separating particulate materials of different surface properties in a hydrodynamic environment, and is used extensively for separating different minerals from each other in the mining industry. In this process, air bubbles are introduced at the bottom of a particulate suspension (pulp), so that bubbles coated with hydrophobic particles rise to the top and form a froth phase while hydrophobic particles stay in suspension. The selectivity of the flotation process is determined by the hydrophobicity of the particulate materials involved, while the kinetics of the process

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46

Crawshaw, Simon A. M. "An investigation into the effects of the froth phase on the recovery of coal by flotation." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278728.

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47

Fundikwa, Bridget. "Environmental Performance Assessment of Froth Flotation for Coal Recovery and Sulfur Removal from Ultrafine Coal Waste." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/21191.

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The South African coal mining industry generates large volumes of coal ultrafine waste (< 150 microns) each year, with a significant amount being dumped in tailing slurry dams. These slurry dams have been associated with prolonged pollution and loss of valuable resources. In the two stage flotation process developed at the University of Cape Town, froth flotation is used to both recover coal (stage 1) and remove pyritic sulfur (stage 2) from ultrafine coal waste, resulting in three outputs streams: a saleable coal product, a small volume sulfide-rich stream, and a reduced volume sulfide lean t

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48

Bhutani, Gaurav. "Numerical modelling of polydispersed flows using an adaptive-mesh finite element method with application to froth flotation." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/39046.

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An efficient numerical framework for the macroscale simulation of three-phase polydispersed flows is presented in this thesis. The primary focus of this research is on modelling the polydispersity in multiphase flows ensuring the tractability of the solution framework. Fluidity, an open-source adaptive-mesh finite element code, has been used for solving the coupled equations efficiently. Froth flotation is one of the most widely used mineral processing operations. The multiphase, turbulent and polydispersed nature of flow in the pulp phase in froth flotation makes it all the more challenging t

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49

Mbamba, Christian Kazadi. "Using froth flotation to mitigate acid rock drainage risks while recovering valuable coal from ultrafine colliery wastes." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10975.

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This dissertation presents the results of an investigation to develop a two-stage flotation process to produce: (i) a low-volume sulfide-rich concentrate that can be treated chemically or biologically or disposed of in a contained manner; (ii) a high-volume (low sulfur) benign tailings, with low ARD potential compared to conventional tailings; and (iii) a coal concentrate that has added value on account of its low sulfur and ash content. Success requires integration of flotation, aqueous chemistry and mineral bioleaching expertise. The approach adopted in this exploratory study entails coal fl

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50

Morar, Sameer Harish. "The use of machine vision to describe and evaluate froth phase behaviour and performance in mineral flotation systems." Doctoral thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/11712.

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Includes synopsis.<br>Includes bibliographical references (leaves 179-190).<br>Within froth flotation, it is widely acknowledged that froth stability affects flotation performance. As a result, it is expected that through the effective management of froth stability, it would be possible to both control and optimise a flotation cell and bank. However, for this to be possible, the relationships between the operating conditions, froth stability behaviour and flotation performance attributes need to be well understood. In addition, froth stability would need to be measured using a robust method su

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