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Rozprawy doktorskie na temat „Flotation”

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Data publikacji: 4 czerwca 2021
Data aktualizacji: 25 lipca 2025

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1

Almaghrabi, Mohammednoor Naher. "Flotation of coarse particles in a modified flotation column cell." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240560.

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2

Yianatos, Juan B. "Column flotation froths." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28385.

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A fundamental study on the behaviour of flotation column froths is presented. Three main aspects were considered: hydrodynamic, cleaning (rejection of hydraulically entrained particles) and selectivity (separation between particles of different hydrophobicity).<br>Column froth hydrodynamics were studied in a two phase (gas-liquid) system. A model to estimate gas holdup from electrical conductivity was developed. Bubble coalescence was evaluated by means of local measurement of gas holdup and bubble size distribution, consequently bubble surface loss along the froth was determined. Mathematical
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3

Lewis, Jonathan Stretton. "A hydrodynamic investigation of platinum flotation in a pilot flotation plant." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/6082.

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Deglon, David Alan. "A hydrodynamic investigation of fine particle flotation in a batch flotation cell." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/5375.

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5

Pazhianur, Rajesh R. "Hydrophobic Forces in Flotation." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/28066.

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An atomic force microscope (AFM) has been used to conduct force measurements to better understand the role of hydrophobic forces in flotation. The force measurements were conducted between a flat mineral substrate and a hydrophobic glass sphere in aqueous solutions. It is assumed that the hydrophobic glass sphere may simulate the behavior of air bubbles during flotation. The results may provide information relevant to the bubble-particle interactions occurring during flotation. The glass sphere was hydrophobized by octadecyltrichlorosilane so that its water contact angle was 109 degrees. The m
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6

Ikumapayi, Fatai Kolawole. "Flotation chemistry of complex sulphide ores : recycling of process water and flotation selectivity." Licentiate thesis, Luleå tekniska universitet, Industriell miljö- och processteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26634.

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Recycling of flotation effluents through the ore processing plant is one of the ways of reducing both plant-operating costs and industrial impact onto the local ecosystem. Such waters named acid mine drainage (AMD), if discharged from sulphide flotation are gypsum (CaSO4.H2O) saturated and have a high salinity (on the order of 1000 ppm). As minor species, they commonly contain reduced sulphur compounds (RSC) (sulfoxyanions with sulphur in the oxidation state below (VI) such as SO32-, S2O32-, S2O52-, and S4O62-), cations of ferrous and non-ferrous metals, frothing molecules, residual chemical r
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7

Rowley, Dylan Mark. "Investigation of Flash Flotation Technology Utilizing Centrifugal Forces and Novel Sparging Methods." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64781.

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A new processing technique, centrifugal flotation, has been developed in recent research projects to overcome the large residence times and fine particle limitations of traditional flotation technologies. The major innovation in the area of centrifugal flotation is the Air Sparged Hydrocyclone (ASH), which has proven capabilities in achieving quality products at specific capacities greater than traditional flotation methods. However, the ASH technology ultimately suffers from sparger plugging problems. Therefore, three unique flotation cyclone designs were developed utilizing external sparging
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8

Schimmoller, Brian Keith. "A bubble-particle interaction model for flotation combining hydrodynamic and surface forces." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09192009-040332/.

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Musara, Washington Tendai. "Coal flotation : statistical comparison of a pilot flotation column and a batch mechanical cell." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29693.

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The effect of manipulated variables on the flotation response of run-of-mine coal supplied by Bullmoose Coal Mine (North East British Columbia) was studied in a pilot flotation column and a batch mechanical cell using experimental designs of the factorial class after the coal had been stage crushed and ground to about 96 percent minus 600 µm, the feed size to the flotation circuit at Bullmoose Coal Mine. The objective was to optimise statistically the two flotation units usings (1) screening designs, (2) the steepest ascent technique, and (3) central composite designs, and to compare cell perf
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10

Changunda, K. "The effect of energy input on flotation kinetics in an oscillating grid flotation cell." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/14416.

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Energy is known to play an important role in particle-bubble contacting in flotation. This thesis investigates the effect of energy input (or agitation) on the flotation kinetics of quartz in a novel oscillating grid flotation cell. The effects of bubble size and particle size have been recognized as important variables affecting particle-bubble contacting in turbulent systems and are investigated in this thesis. The research work done in this thesis is a continuation of the work done by the Centre for Minerals Research by Deglon (1998) who investigated the effects of energy in a batch mechani
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11

Mankosa, Michael James. "Scale-up of column flotation." Diss., This resource online, 1990. https://scholar.lib.vt.edu/ETD-db/ETD-catalog/manage_bound.

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12

Lascelles, Dominique. "Quantification of adsorbed flotation reagents." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80118.

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Collector interaction with mineral surfaces has long been studied. Little work has been done, however, on directly quantifying reagent adsorption, certainly under industrial process conditions. The use of a novel surface analysis technique, Headspace Analysis Gas-phase Infrared Spectroscopy (HAGIS), is suggested for quantification of adsorbed reagents in mineral processing.<br>As a first exercise, a test system of xanthate adsorption onto lead sulphide minerals was studied. A survey of possible calibration standards (pure xanthate, a synthetic lead-xanthate, galena (PbS) and a lead sulp
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13

Xu, Manqiu. "Sparger study in flotation columns." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64062.

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14

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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15

Hartmann, R. (Robert). "Flotation using cellulose-based chemicals." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526219806.

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Abstract Flotation is a well-known and widely used technique for the separation of particles smaller than 250 µm, but efficient performance requires the use of various synthetic chemicals which can potentially damage the health of humans and animals and pollute the environment. Consequently, their replacement through a more environment-friendly and sustainable alternative has been demanded. One promising candidate is cellulose, which is an abundant natural polymer that is environment-friendly and can be treated chemically and physically to yield tailored properties and thus a potential for use
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16

Craynon, John Raymond. "The collectorless flotation of sphalerite." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/45645.

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<p>The flotation of sphalerite has been demonstrated without the use of collectors. The effect of redox potential, pH, and copper-activation have been investigated in tests using samples of pure mineral. It has been found that in general, collectorless flotation of sphalerite can be accomplished at potentials greater than -200 mV, SHE, and is more readily carried out in acidic solutions. It has also been shown that although copper-activation was necessary to achieve flotation recoveries above 35%, an excessive addition of cupric ions may result in a decrease in floatability.</p> <p>
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17

Brady, Michael Richard. "Multiphase Hydrodynamics in Flotation Systems." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/28860.

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Flotation is a complex, multiphase process used to separate minerals. Four problems central to the fundamentals of the flotation process were studied. A multiphase grid turbulence experiment was conducted to verify particle collision models. The slip velocities of solid particles and bubbles were measured using Digital Particle Image Velocimetry (DPIV). The experimental results were compared with the predictions from empirical and theoretical collision models. Time-resolved DPIV was used to measure the turbulent velocity field in a Rushton turbine around the impeller region. The turbulenc
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18

Hu, Weimeng. "Flotation circuit optimisation and design." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/24805.

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Froth flotation is a widely used and versatile mineral processing method for concentrating metal ores. A finely ground ore feed is processed through a flotation circuit consisting of interlinked cells where mineral particles are separated from waste material by using their differences in surface properties. The layout of the circuit has been found to greatly affect the overall flotation performance. While industrial flotation circuit design has in the past relied on experience, due to the complex nature of the process, only small scale circuit optimisations using simple flotation models were r
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19

Mills, Peter John Temple. "Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns." Doctoral thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/21987.

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Bibliography: pages 181-189.<br>Column flotation has gained worldwide acceptance in the minerals processing industry in the past decade. This has been due the operating characteristics of flotation columns which can produce improved grades and recoveries over conventional cells. Added to this, flotation columns are both simple to operate and generally less expensive than the equivalent requirement of conventional cells. Flotation columns are able to produce improved results due to a deep washed froth phase and a quiescent pulp phase in which the pulp interacts countercurrently with the air bub
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20

Massey, Wesley Thomas. "Investigating the effect of energy dissipation on flotation kinetics in an oscillating grid flotation cell." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/18475.

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This thesis investigates the effect of energy dissipation on the flotation kinetics of quartz in an oscillating grid flotation cell. Oscillating grids exhibit relatively isotropic and homogeneous turbulence, which cannot be achieved in standard impeller agitated flotation cells. Due to this they provide a potentially ideal environment in which to investigate the effects of energy dissipation on flotation kinetics. Previous work in an oscillating grid flotation cell was limited to energy dissipations of up to 0.6 kW/m³, which is low when compared to 0.6 - 3 kW/m³ commonly used in both flotation
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21

Edwards, Robert Paul. "Expert system control of a flotation circuit." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29600.

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Expert systems technology is a discipline of artificial intelligence that has recently emerged from the research environment and is currently making significant inroads into business and industry. The proponents of expert systems make many attractive claims. Two of the claims are that expert systems can capture the knowledge of the experts and can be programmed by non-programmers. To date, most uses of this technology in the process industry are in off-line applications, that is, applications that are not directly tied to operating environments. Moreover, those that are used in on-line environ
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22

Harbort, Gregory J. "A study of the hydrodynamics, bubble-particle interaction and flotation within the high intensity zone of a flotation machine and its implication for flotation machine design /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19448.pdf.

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23

Harris, T. A. "The development of a flotation simulation methodology towards an optimisation study of UG2 platinum flotation circuits." Doctoral thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/5322.

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Bibliography: p. [251]-266.<br>The design of new flotation plants is still based substantially on experience obtained from prior plant designs. Design criteria are typically based on rule of thumb procedures that often prove to be highly ineffective. The development of appropriate models of the flotation process is a means of addressing these problems so that flotation plant simulations can be performed to identify the true potential of existing plants as well as in the design of new flotation plants. This thesis addresses the complex issue of developing a robust methodology for use in flotati
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24

Healy, Daniel Francis. "The depression of sphalerite during carbon pre-flotation and lead flotation at the Century Mine concentrator." Thesis, Curtin University, 2005. http://hdl.handle.net/20.500.11937/1787.

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The differential lead-zinc flotation process has been practised since 1912, yet selectivity in the process remains a significant technical issue in many operations. The minerals processing operation at Zinifex Limited's Century Mine, which uses differential flotation, began in November 1999 and the flotation behavior of the ore remains a major research interest. The present study was aimed to determine the possible mechanisms of sphalerite recovery during carbon pre-flotation and lead flotation in this operation including identification of the variables that affect these two flotation stages a
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25

Healy, Daniel Francis. "The depression of sphalerite during carbon pre-flotation and lead flotation at the Century Mine concentrator." Curtin University of Technology, Western Australian School of Mines, 2005. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16397.

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The differential lead-zinc flotation process has been practised since 1912, yet selectivity in the process remains a significant technical issue in many operations. The minerals processing operation at Zinifex Limited's Century Mine, which uses differential flotation, began in November 1999 and the flotation behavior of the ore remains a major research interest. The present study was aimed to determine the possible mechanisms of sphalerite recovery during carbon pre-flotation and lead flotation in this operation including identification of the variables that affect these two flotation stages a
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26

Smith, Christopher David. "Flotation Response to Gas Distribution Management." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486926.

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Froth f1otation.is the most widely used mineral concentration process in the world. Experimental work has shown different gas distribution profiles to a bank of flotation cells elicit different metallurgical responses; with an increasing profile yielding the highest cumulative recovery. However, this same response has not been seen on flotation models, it is believed this· is due to a lack of a distinct, physics based, froth zone model these flotation models. Recent research work has focused upon developipg physics based computer simulations of flotation froths able to yield mineral grade a
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Ding, Kejian. "Zero-conditioning time concept in flotation." Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/30776.

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In the particle-to-bubble attachment process collector species are needed at the attachment point to render the mineral surface hydrophobic. It is common to assume that such species are transported toward mineral particles via diffusion/mixing and render the mineral surface hydrophobic by adsorption. However, collector species can also be brought to the point of attachment by bubbles carrying the species on their surfaces. That ensures that the collector is at the right time at the point where it is needed to facilitate the attachment of the particle to the bubble. It is generally accep
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Crawford, Russell J., and n/a. "Particle size, hydrophobicity and flotation response." Swinburne University of Technology, 1986. http://adt.lib.swin.edu.au./public/adt-VSWT20070828.150946.

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Quartz particles of various discrete particle size ranges have been methylated to varying known mounts using trimethylchlorosilane and their flotation behaviour has been assessed in a modification of the Hallimond tube. For each particle size there is a definite degree of. surface coverage below which the particles do not float. A 'flotation domain' is identified which shorvs that both coarse (-100pm) and fine (-10pm) particles require a greater degree of surface coverage to initiate flotation than do intermediate (-40pm) particles. Water contact angles have been measured on quartz plates and
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Watson, Jeffrey A. "Deinking recycled paper using column flotation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29636.pdf.

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Watson, Jeffrey A. 1971. "Deinking recycled paper using column flotation." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27262.

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The degree of waste paper recycling has been increasing steadily in North America over the last decade. Flotation is a popular method for removing ink from fibres (deinking) and is traditionally performed in mechanical cells. Column flotation has been proposed as an alternative to mechanical cells. In this work, open and packed laboratory and pilot-scale columns were operated to determine their relative merits and how they compare to a circuit of mechanical cells.<br>It was found that the type of sparger was critical for obtaining high flotation efficiencies. Fine porous stainless steel sparge
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31

Yu, Shaning. "Particle collection in a flotation column." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66002.

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Zhou, Zhi-ang. "Gas nucleation and cavitation in flotation." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40477.

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The role of gas nucleation and cavitation in flotation has been systemically studied. It was shown theoretically that about a 10 m high recovery zone is required to ensure at least one collision between a particle less than 10 $ mu$m and a bubble, under conventional column flotation conditions, indicating that the collision is the rate limiting step for fine particle flotation. Direct formation of small bubbles on the hydrophobic particle surfaces and in slurry by gas nucleation and cavitation has, therefore, been exploited as a way to accelerate the fine particle collection rate.<br>Experimen
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33

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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Zhang, Lingyu. "Enhanced phosphate flotation using novel depressants." UKnowledge, 2013. http://uknowledge.uky.edu/mng_etds/10.

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Froth flotation is the most efficient method for phosphate separation, which is a physic-chemical separation process based on the difference of surface properties between the valuable minerals and unwanted gangue minerals. However, the presence of clay slimes in the slurry after grinding consumes a large amount of reagents, decreases the collision probability between bubbles and minerals, prevents phosphate particle attachment to air bubbles, and thus considerably reduces flotation recovery and concentrate grade. Georgia Pacific Chemical, LLC has recently developed novel depressants, i.e., cla
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35

Marson, Andrew D. "Air flotation drying of paper pulp." Thesis, University of Manchester, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613430.

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Although much academic research has been devoted to the fields of paper drying and air impingement heat transfer, little of the resulting information is in a form usable to dryer manufacturers. The aim of this research was therefore to develop a model suitable for the designing the flotation dryers often used in the production of market pulps. The heat transfer characteristics of several commercial nozzle designs, namely flotation nozzles, slot nozzles and arrays of round orifices, were determined under conditions relevant to pulp drying. Empirical correlations for the Nusselt number for the n
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Chow, Ping-Sheng. "Separation of mixed plastics by flotation." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318720.

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Wallin, Peter John. "The mathematical modelling of flotation kinetics." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314632.

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Hale, Waverly Mitchell. "Surface chemical aspects of microbubble flotation." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45816.

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<p>In order to demonstrate the ability of microbubble flotation to superclean coal to ash levels of less than 2%, several Eastern U. S. coals have been tested. The results show that the process is capable of producing superclean coal with improved recovery as compared to the conventional flotation process.<p> <p> To further improve and understand the microbubble flotation process, electrokinetic studies of the hydrocarbon oils used in flotation as collectors have been conducted. Also, the effect of oil emulsifiers on the zeta potential of oil droplets has been studied. In general,
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An, Dongbo, and Dongbo An. "Improved Flotation of Bastnaesite and Chalcopyrite." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/624299.

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The present study is targeted on the optimization of the flotation conditions for the improvement of the industrial flotation practice. Part I is focused on the improvement of the flotation of Mountain Pass mine ore for the beneficiation of rare earth elements. The objective is to improve the rare earth recovery of Mountain Pass ore by developing a novel flotation reagents' scheme, meanwhile reducing the flotation temperature to a cost-efficient level and simplifying the flowsheet. Surface chemistry study by contact angle, zeta potential and microflotation tests indicate that a mixed collector
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40

Schmidt, Dale C. "Flotation deinking of toner-printed papers /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/9828.

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41

Christie, Jevan Craig. "The sensitivity of direct faecal examination, faecal flotation and centrifugal sedimentation / flotation in the diagnosis of canine spirocercosis." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/24987.

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A variety of faecal examination methods have shown variable sensitivity in identifying larvated Spirocerca lupi (S. lupi) eggs. The purpose of this study was to determine which faecal examination method, including a novel modified centrifugal flotation method, was most sensitive in the diagnosis of spirocercosis. Faeces were collected from 33 dogs diagnosed with spirocercosis by oesophageal endoscopy at the Onderstepoort Veterinary Academic Hospital between 2008 and 2009. If the first evaluation was negative, a second faecal sample was evaluated 24-48 h later. Ten faecal examinations using 1 g
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42

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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Hobert, Andrew Reid. "Development of a Novel Air Sparging Device." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/71828.

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Column flotation is commonly employed in the processing and recovery of fine mineral particles due to an increase in flotation selectivity unattainable using conventional flotation methods. Such an increase in selectivity is due to the employment of wash water, minimizing hydraulic entrainment of fine gangue particles, and the presence of quiescent operating conditions assisted by the use of various air sparging technologies. High performance air spargers increase the probability of collision and attachment between air bubbles and particles, thereby improving recovery of fine and coarse minera
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44

Ozun, Savas. "Flotation Characteristics Of Minerals In Feldspar Ores." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614273/index.pdf.

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Albite (Na-feldspar) and orthoclase (K-feldspar) are the major feldspar minerals used in the production of glass and ceramics. They are found together with impurities like biotite, muscovite, quartz and rutile which are not desired for ceramics and glass industries. Therefore, these have to be removed to make the ore available for industrial use. In order to shed light on the actual feldspar ores, in this study<br>the flotation characteristics of albite, biotite, muscovite, orthoclase, quartz and rutile were investigated separately in their pure forms. In the investigation, the electrokinetic
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Ajersch, Michael John. "Mechanisms of pulp loss in flotation deinking." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30126.pdf.

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Guo, Jun-Xiang. "Development and theory of centrifugal flotation cells." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2002. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ65675.pdf.

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Ajersch, Michael. "Mechanisms of pulp loss in flotation deinking /." *McMaster only, 1997.

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Emerson, Zachery Ian. "Particle and bubble interactions in flotation systems." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Dissertations/EMERSON_ZACHERY_45.pdf.

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Hosseini, Seyed Hamid. "Physicochemical studies of oxide zinc mineral flotation /." Luleå : Division of Mineral Processing, Department of Chemical Engineering and Geosciences, Luleå University of Technology, 2008. http://epubl.ltu.se/1402-1544/2008/17/.

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Mohamed, Ahmed. "Frother blends in flotation: polyglycols and alcohols." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104699.

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Streszczenie:
Frothers are non ionic surfactants, commonly alcohols and polyglycols, used to provide two functions in flotation, namely to reduce bubble size and stabilize froth. Both functions imply an impact on the properties of the air-water interface (bubble surface) but there is no consensus on the mechanism, particularly with regard to bubble size reduction. Blending frothers is becoming common in flotation practice arguably enhancing performance by permitting independent control of the two frother functions. However, there have been no studies to determine this blend possible action. The blends used
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