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    Wyświetlanie 1-8 z 8
    Tytuł:
    Kinetic modelling of flotation column and Jameson cell in coal
    Autorzy:
    Karaca, Sevgi
    Ucar, Ali
    Sahbaz, Oktay
    Powiązania:
    https://bibliotekanauki.pl/articles/2146872.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coarse particle
    flotation column
    Jameson cell
    kinetics
    particle size
    Opis:
    Physical enrichment technologies can be used worldwide in various coal washing plants to enrich up to 500 μm particle size. Conversely, coals smaller than this are discarded as waste, causing storage and environmental issues. In this regard, studies on coal below 500 μm in Turkey have recently acquired attraction. The Jameson flotation cell and flotation column, which have many uses worldwide but are not used throughout the plant in Turkey, were used to investigate the separation possibilities of coals below 500 μm. In the study, the flotation column and Jameson cell performances for three different particle sizes (-500+300, -300+212 and -212+106 μm) were compared. For the first time, both machines operated in a negative bias condition. In addition, the flotation kinetics of the machines were modelled with some critical operating parameters. Models illustrating the main and multiple effects of the parameters were developed using the data derived from the experimental results, and the models were statistically significant at the 95% confidence level. In the experiments performed with both flotation machines, the flotation rate increases with the decrease in particle size in general. According to the results, the velocity increase in the Jameson cell was 0.0050-0.0075 min-1 compared to the flotation column in the experiments performed in the size range of -500+300 μm, and the flotation rate constant increased approximately twice. In the size range of -212+106 μm, the difference became larger, and the flotation rate of the Jameson cell increased up to six times with a difference of 0.0450-0.0500 min-1.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152848
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigating the effect of lip froth washing on coal yield during flotation of a high ash South African coal
    Autorzy:
    du Plessis, Cherryl
    Sibanda, Vusumuzi
    Dworzanowski, Marek
    Danha, Gwiranai
    Mamvura, Tirivaviri A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146887.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    mechanical flotation cell
    flotation reagents
    lip froth washing
    coal yield
    primary wash cells
    secondary wash cells
    Opis:
    An investigation was conducted to evaluate the effect of lip washing on coal flotation at Anglo American’s Goedehoop South (GHS) fine coal plant in South Africa. In the test-work, performance of cells with lip washing system were compared with baseline cells without lip washing in terms of coal yield and coal quality. Yields observed with lip washing were significantly higher than those of baseline cells. Improvements of up to 15% were recorded. The product obtained at low flotation reagent dosages (1.30–1.45 kg/t) on lip wash cells had ~16.85% ash content against ~17.65% with baseline cells, suggesting that higher yields could be achieved at superior qualities to those achieved with baseline cells. At higher reagent dosages (1.60–1.75 kg/t), coal yields further improved but quality reduced on lip wash cells. Calorific Values (CV) of coal products obtained by lip washing and baseline flotation were similar. When different coal particle size fractions were floated separately, the yield increased as particle size increased from 75 to 300 μm and then decreased from 300 to 500 μm for both baseline and lip washing flotation. Lip washing caused a marked increase in the yield for finer particles (< 300 μm) with optimum size class of between 212 – 300 μm. In addition, a much bigger increase in the yield was achievable with lip washing of lower quality coal. The ash content after lip washing of poor-quality coal were also comparable to the ash content after lip washing of good quality coal.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 6; 169--181
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of frothers and particle size on the flotation kinetics of the Jameson Cell
    Autorzy:
    Şahbaz, Oktay
    Demir, Muhammet Kubilay
    Powiązania:
    https://bibliotekanauki.pl/articles/1845223.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation kinetics
    Jameson cell
    frothers
    particle size
    Opis:
    Determination of the flotation kinetic is crucial for optimization, simulation, and plant design for flotation processes. Even though there are many studies carried out to clarify the kinetic properties of the conventional flotation cells, there is not enough detailed study about the Jameson cell which is used more than 300 plants but no application in Turkey yet. One of the most important parameters affects the kinetic of flotation is a frother. The effects of common frothers on the kinetic of Jameson cell can be crucial due to the possible further application of the cell in European and Turkish flotation industries. The present study was performed out to reveal the kinetic properties of the Jameson cell by using both pure quartz and coal particles. Besides, the effects of three different types of frothers on the kinetic of the Jameson cell were investigated for various particles sizes. According to the results, aliphatic alcohol type frother (MIBC) provided higher recovery for fine particles, while polypropylene glycol type frother (AF65) gave a better ability to float medium and coarse size particles. Additionally, the results show that the Jameson cell was four times faster than the mechanical cell for medium size while the ratio was three times for coarse particles. Lastly AF65 can be used for flotation of coarse particles in the Jameson cell while MIBC can be preferred for fines.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 5; 829-838
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Jameson cell and jet diffuser flotation column
    Autorzy:
    Bilir, K.
    Ucar, A.
    Sahbaz, O.
    Gursoy, H.
    Oteyaka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/109686.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    jet diffuser flotation column
    flotation
    Jameson Cell
    talc
    Opis:
    A Jet Diffuser Flotation Column (JDFC) is a newly designed flotation device which resembles the Jameson cell (JFC) in terms of operational principles, but it has an important difference regarding to the structural characteristics in the downcomer. The main difference of JDFC is the diffuser type of downcomer which has been designed using the hydrodynamic consideration and fluid mechanics principles. The aim of the design was to increase the device efficiency for coarse particle flotation. Therefore, the turbulence occurring at the end of the downcomer was reduced, and the detachment probability of the coarse particle decreased. In addition, a homogenous and stable foam zone in the cell was obtained. According to the experimental results carried out in a pilot scale showed that not only higher flotation performance in comparison to the Jameson cell was obtained specifically for the coarse particles but also the quiescent froth layer was acquired under the given conditions. In these experiments, a vertical pipe of JDFC having an inlet diameter of 60 mm and outlet diameters of 115, 125 and 135 mm was used with the separation tank with the diameter of 390 mm. By using the data, the pilot scale JDFC with the 4100 mm vertical pipe integrated with the separation tank was produced, and the flotation tests were carried out by using a talc ore. Finally, the talc recovery of 90% was obtained using the JDFC for the particle size of 350 μm.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 1; 174-181
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Gas Phase in Flotation Process. Part 2, Empirical Functions of Occurrence Frequency of Tested Parameters
    Analiza fazy gazowej w procesie flotacji. Część 2, Funkcje empiryczne częstotliwości występowania badanych parametrów
    Autorzy:
    Młynarczykowska, A.
    Oleksik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/318931.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    flotacja komórek
    rozkład pęcherzyków powietrza
    empiryczna weryfikacja modelu teoretycznego
    cell flotation
    air bubbles distribution
    empirical verification of the theoretical model
    Opis:
    Mineralization of air bubbles, the most important part of the froth flotation process, depends on a number of factors which affect the conditions in the flotation chamber’s work space. They can be defined as physico-chemical parameters and hydrodynamic parameters. The latter depend on the operating conditions of the floatation machine during the enrichment process. The process of forming of durable flotation aggregates is preceded by generation and dispersion of gas bubbles in the flotation machine tank which also depend on the aforementioned parameters. The paper presents the results of experimental analyses of changes of selected values which define the size of air bubbles generated in the flotation chamber.
    Mineralizacja pęcherzyków powietrza jest najważniejszym etapem procesu flotacji pianowej. Zależy on od szeregu czynników wpływających na warunki panujące w przestrzeni roboczej komory flotacyjnej. Można je określić jako parametry fizykochemiczne oraz hydrodynamiczne. Te ostanie są zdeterminowane warunkami pracy maszyny flotacyjnej podczas procesu wzbogacania. Procesem poprzedzającym tworzenie trwałych agregatów flotacyjnych jest generowanie i dyspersja pęcherzyków gazu w komorze maszyny flotacyjnej, które są również zależne od wymienionych parametrów. W artykule przedstawiono wyniki analiz doświadczalnych zmiany wybranych wielkości opisujących rozmiary pęcherzyków powietrza generowanych w komorze flotacyjnej.
    Źródło:
    Inżynieria Mineralna; 2017, R. 18, nr 1, 1; 257-262
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of bubble size distribution in a laboratory mechanical flotation cell by a laser diffraction technique
    Autorzy:
    Mazahernasab, R.
    Ahmadi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/110401.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bubble size distribution
    mechanical flotation cell
    laser diffraction technique (LDT)
    Image Analysis Technique (IAT)
    effective parameters
    Opis:
    In this study, a laser diffraction technique (LDT) was used to measure size distribution of bubbles generated in a two-phase system in a laboratory mechanical flotation cell. In LDT, a laser light beam passed through the bubbles inside the measurement cell and the scattered light was recorded by detectors. In order to show the effectiveness of LDT, an image analysis technique (IAT) was applied in parallel to measure the size of bubbles. To determine the bubble size by IAT, around 200 images were taken in each test. In addition, the important operating parameters of the mechanical flotation cell affecting the bubble size distribution, including the impeller speed, aeration rate and frother concentration, were investigated. The response parameter in this study was Db(50) which represent the size of bubble at which there is 50% of the distribution. The results of this study showed that the LDT and IAT techniques were in a good agreement when Db(50) was in the range of -800+400 μm and there was a discrepancy for Db(50) in the range of -400+100 μm. Furthermore, Db(50) decreased from 727 to 284 μm when impeller speed increased from 700 to 1200 rpm. Additionally, an increase in the aeration rate from 1 dm3/min to 2.5 dm3/min led to a rise in Db(50) from 418 to 456 μm. Finally, increasing the frother concentration from 10 to 60 ppm reduced the Db(50) from 704 to 387 μm.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 690-702
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of air-to-pulp ratio and bias factor on flotation of complex cu-zn sulphide ore in the Jameson cell
    Autorzy:
    Gursoy, Y. H.
    Oteyaka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/110799.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    air-to-pulp ratio
    bias factor
    Jameson cell
    flotation
    hold-up
    Opis:
    The air-to-pulp ratio and bias factor are important operating parameters in the Jameson flotation cell. These parameters have significant effect on micro-events taking place between particles and bubbles in flotation, and hence on flotation performance. In this study, the possibilities of obtaining a Cu-Zn rich bulk concentrate from complex sulphide ore from the Cayeli region (Turkey) were investigated using the lab-scale Jameson cell. The effect of air-to-pulp ratio and bias factor on flotation recovery were also studied. The ore has problematic flotation behaviour due to very fine liberation size and oxidation. The results showed that the Cu-Zn rich bulk concentrate can be obtained from the ore with satisfactory grade and recovery. It was determined that the air-to-pulp ratio and bias factor have significant effect on the flotation recovery. The optimum values of air-to-pulp ratio and bias factor in flotation of rather fine sized minerals were determined to be within the range of 1-1.5 and 0.70-0.95, respectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 511-519
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recycling of colemanite tailings using the Jameson flotation technology
    Autorzy:
    Ucar, A.
    Sahbaz, O.
    Kerenciler, S.
    Oteyaka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/110375.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    colemanite tailing
    flotation
    Jameson cell
    Opis:
    In this study, beneficiation of colemanite minerals from tailings of the Emet Boron Processing Plant using a laboratory scale Jameson flotation cell was investigated in detail. Effect of some working parameters of the Jameson cell such as jet length, plunging depth of downcomer, and bias factor was studied for the flotation performance of colemanite. The results showed that all parameters showed a significant effect on colemanite flotation using the Jameson cell which was the first time used in boron flotation with a negative bias factor. The results also indicated that a high recovery could be obtained with a worthy grade values by the negative bias factor. According to the results obtained at the bias factor of -0.3, jet length of 3 cm, and plunging depth of 20 cm, B2O3 content of the sample increased to approximately 46% from 36.8% with a recovery of 98.47%.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 2; 645-655
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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