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    Wyświetlanie 1-8 z 8
    Tytuł:
    Research of nanobubbles enhanced reverse anionic flotation of a midlow grade phosphate ore
    Autorzy:
    Zhang, Tiebin
    Zhang, Qin
    Powiązania:
    https://bibliotekanauki.pl/articles/2146853.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nanobubbles
    reverse anionic flotation
    phosphate ore
    dolomite
    particle aggregation
    Opis:
    The reverse anionic flotation is commonly used to upgrade the mid-low grade phosphate ore in China. The mineral characterization of raw ore shows that carbonate and phosphate minerals combined with fine intergrowth, difficulty in upgrading. Flotation using nanobubbles (NBs) can significantly enhance the flotation efficiency of fine particles of minerals. To research the effect of NBs on the flotation process of this phosphate ore, two flotation tests with and without NBs were compared. The results show that the MgO removal had an increment of 10% in the case of NBs flotation versus conventional flotation in the approximate grade and recovery of P2O5. The foam product of NBs flotation had smaller dimensions than the conventional flotation. NBs enhanced the contact angle on dolomite surface from 45.8 ° to 64.5 °, and increases the d50 of dolomite from 20.49 µm to 30.43 µm.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 1; 113--125
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sterilisation of nanobubble dispersions
    Autorzy:
    Ulatowski, Karol
    Fiuk, Julia
    Sobieszuk, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/184996.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanobubbles
    nanodispersion
    sterilisation
    filtration
    ultrasonication
    nanobąbelki
    nanodyspersja
    sterylizacja
    filtrowanie
    ultrasonikacja
    Opis:
    In this paper, three methods of sterilisation are compared to determine their usability in nanobubbledispersion sterilisation: filtration, thermal sterilisation and sonication (in twosystems: using a sonotrodeand sonication bath). Nanobubble dispersions are most commonly generated in non-sterile systemswhich precludes them from use in most biological research. As a result of this study, filtration waschosen as the best method for nanobubble sterilisation.
    Źródło:
    Chemical and Process Engineering; 2020, 41, 1; 69--76
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of effective parameters on generating submicron (nano)-bubbles using the hydrodynamic cavitation
    Autorzy:
    Nazari, Sabereh
    Shafaei, Sied Ziaedin
    Hassanzadeh, Ahmad
    Azizi, Asghar
    Gharabaghi, Mahdi
    Ahmadi, Rahman
    Shahbazi, Behzad
    Powiązania:
    https://bibliotekanauki.pl/articles/1845212.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coarse quartz particles
    bulk nanobubbles (NBs)
    fractional factorial design
    frother type
    temperature
    Opis:
    Although submicron (nano)-bubbles (NBs) have been broadly used in the laboratory flotation processes, the role of critical factors in their generation is not adequately explored in the literature. The present study investigates the effect of six key factors on generating submicron-sized bubbles and its application to coarse-sized quartz flotation. Interaction of influential factors is highlighted, which was generally overlooked in previous studies. These parameters i.e. frother type (MIBC and A65), frother dosage (50-130 mg/L), air flow rate (0.1-0.4 L/min), pressure in Venturi tube (250-400 kPa), liquid temperature (22-42 °C) and pH (6-10) were evaluated through software based statistical fractional factorial design. The size distribution of NBs produced by the principle of hydrodynamic cavitation was measured using a laser particle size analyzer (LPSA), and Sauter mean bubble diameter (d32) was considered as the response of experimental design. Batch flotation experiments were performed with and without the A65 and MIBC-NBs. The results of experimental design showed that relative intensity of the main factors followed the order of air flow rate>temperature>frother type as the most effective parameters on the bubble size. It was revealed that the lowest air flow rate (0.1 L/min) produced the smallest bubbles. Meanwhile, the d32 decreased as the liquid temperature increased, and the bubble size strongly was related to the frother type and its concentration. Indeed, with changing frother from MIBC to A65, the reduction in mean bubble size was two-fold. Interaction of frother type with its dosage, air flow rate and pressure were statistically recognized significant on the mean bubble size, which was confirmed by p-values. Finally, flotation recovery of quartz particles improved ca. 22% in the presence of NBs compared to the conventional flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 5; 884-904
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie właściwości fizykochemicznych dyspersji mikro- i nanopęcherzyków azotu w cieczach
    Investigation of physicochemical properties of nitrogen micro- and nanobubbles dispersion in liquids
    Autorzy:
    Ulatowski, K.
    Maciejewska, A.
    Mróz, A.
    Sobieszuk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073348.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    nanopęcherzyki
    lepkość
    napięcie powierzchniowe
    zwilżalność
    nanobubbles
    viscosity
    surface tension
    wettability
    Opis:
    W pracy przeprowadzono generację nanopęcherzyków azotu w wodzie dejonizowanej za pomocą układów z membranami cylindrycznymi oraz przygotowano roztwory etanolu w wodzie i wodzie z nanodyspersją pęcherzyków. Zbadano wpływ obecności nanodyspersji na lepkość, napięcie powierzchniowe oraz kąty zwilżania szkła. Zbadano wpływ obecności nanodyspersji na lepkość, napięcie powierzchniowe oraz kąty zwilżania szkła. Stwierdzono, że w badanym zakresie stężeń etanolu obecność nanopęcherzyków nie wpływa na lepkość roztworu, podnosi jego napięcie powierzchniowe dla niskich stężeń etanolu (poniżej 20% mas.) oraz zwiększa kąty zwilżania na szkle w badanym zakresie stężeń.
    In this work the generation of nanobubbles using the cylindric al-porous-membrane system was performed and mixtures of ethanol in pure water and water with nanobubbles were prepared. The influence of nanodispersion on viscosity, surface tension and contact angles on glass was investigated. The results show that in the investigated range of ethanol concentration a presence of nanobubbles has no influence on liquid viscosity, increases surface tension for low ethanol concentrations (below 20 mass %) and increases the contact angles on glass in the investigated range of concentrations.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2018, 3; 83--84
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of dissolved air on bubble attachment to highly oriented pyrolytic graphite
    Autorzy:
    Krasowska, M.
    Sellapperumage, P. M. F.
    Ralston, J.
    Beattie, D. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/110554.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bubble attachment
    hydrophobic surface
    van der Waals interaction
    nanobubbles
    dissolved air
    Opis:
    The effect of air, dissolved in 0.1 M KCl solution, on bubble attachment to the smooth hydrophobic surface of highly oriented pyrolytic graphite was studied. The stability of a wetting film in such a system is governed by surface forces, i.e. electrostatic and van der Waals interactions. At the high ionic strength investigated, the electric double layer forces are both weak and of short range, therefore the stability of the wetting film is dominated by van der Waals interactions. The Hamaker coefficient for the highly oriented pyrolytic graphite-KCl aqueous solution-air system is negative and hence van der Waals interactions are repulsive. A repulsive force should stabilize the wetting film, preventing its rupture and bubble attachment to the highly oriented pyrolytic graphite surface. Many experimental studies have found that wetting films are not stable at graphite or coal surfaces, and air bubbles attach. In the present experiments, the stability of the wetting films decreased with increasing amount of dissolved air. The time required for film drainage, rupture, and air bubble attachment was shortened by two orders of magnitude when the experiments were performed in air saturated 0.1 M KCl solution. This instability was attributed to an increasing number of nano- and submicron- bubbles nucleated at the graphite surface. The Hamaker coefficient across the air-KCl aqueous solution-air system is positive and hence van der Waals interactions are attractive, resulting in wetting film rupture and macroscopic air bubble attachment to a highly oriented pyrolytic graphite surface decorated with resident nano- and submicro-metre bubbles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 1; 163-173
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of liquid flowrate on size of nanobubbles generated by porous-membrane modules
    Autorzy:
    Ulatowski, K.
    Sobieszuk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/185184.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanobubbles
    porous membranes
    size distribution
    membrana porowata
    rozkład wielkości
    Opis:
    The aim of this work was to investigate the influence of distilled water flowrate in two different porousmembrane modules on the size of generated nitrogen nanobubbles. Modules had different diameter and number of membrane tubes inside the module. As bubbles are cut off from the membrane surface by a shear stress induced by the liquid flow, the change in the linear liquid velocity should result in a change of the generated bubble diameter. For both modules, higher flowrate of liquid induced generation of smaller bubbles, which was consistent with our expectations. This effect can help us in generation of bubbles of desired size.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 3; 335--345
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanobubbles effect on the mechanical flotation of phosphate ore fine particles
    Autorzy:
    Pourkarimi, Z.
    Rezai, B.
    Noaparast, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110797.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    fine particles
    phosphate
    nanobubbles
    hydrodynamic cavitation
    Venturi
    LPSA
    Flo-Y-S
    Opis:
    Froth flotation is one of the main methods for processing of phosphate ores. However, flotation of fine particles, especially phosphate ores, has always been one of the fundamental problems. For example, about 10% of Esfordi phosphate processing plant ore with a grade of more than 16% P2O5 and d80 of less than 30 μm is sent to the tailing dam. Flotation using nanobubbles generated by hydrodynamic cavitation is one of the latest industrial techniques to recycle fine particles of minerals. A significant recovery increment in flotation of fine particles using nanobubbles has been one of the main topics of flotation science in recent years. Fine bubbles have important effects on the gas holdup, which is necessary in the froth flotation cell of mineral based process industries. At a given gas holdup, using finer bubbles can reduce frother consumption. An exclusive nanobubble generation system has been developed at Iran Mineral Processing Research Center (IMPRC) for evaluating the effect of nanobubbles on froth flotation. This device enhances venturi tubes and works based on cavitation phenomena. In this study, a comparison of conventional flotation and nanobubble enhanced flotation in mechanical cells was carried out on two types of phosphate ore samples. As a result, the flotation recovery had a significant increment of more than 30% in the case of using nanobubbles versus conventional flotation in the same grade of P2O5.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 278-292
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective parameters on generation of nanobubbles by cavitation method for froth flotation applications
    Autorzy:
    Pourkarimi, Z.
    Rezai, B.
    Noaparast, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/110607.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    nanobubbles
    cavitation
    venturi
    laser particle size analyzer
    Opis:
    The significant recovery increase in flotation of fine particles using nanobubbles has been one of the major topics in flotation science in recent years. Fine bubbles have an important effect on gas hold-up, which is necessary in froth flotation of minerals based on the process industries. At a given gas hold-up, using finer bubbles can reduce frother consumption. An exclusive nanobubble generation system has been developed in Iran Mineral Processing Research Center (IMPRC) to evaluate the effect of nanobubbles on the froth flotation performance. This device, which enhanced venturi tubes, works according to cavitation phenomena. The venturi tube is the most widely used hydrodynamic cavitation device, in which liquid flow increases in the conical convergent zone of the tube due to the thin diameter. The liquid in the cylindrical throat is higher in a flow velocity and lower in a pressure than the liquid in the entrance cylinder, which results in cavitation. In this research work, various factors such as the frother type and dosage, pH, compressed air flow, pressure in cavitation nozzle, gas types, temperature and venturi tube internal diameter were studied. For this purpose, a five-level central composite experimental design was used to check the influence of four important parameters on the median size and volume of nanobubbles. Online measurement of the bubbles size was implemented by a laser particle size analyzer (LPSA), according to standard BS ISO 13320-09. Due to the above parameters and obtained responses, the analysis of variance (ANOVA) was conducted with a suitable model to optimize the conditions, with the aim of minimizing the size of air bubbles. The optimal conditions were: frother (MIBC) dosage of 75.8 mg/dm3, air flow rate of 0.28 dm3/min, pressure of 324 kPa and pH of 9.5. The median bubble size d50 was equal to 203 nm. To validate the results, a test under optimum conditions was performed and the obtained results indicated that there was a good fit at the confidence interval of 95% and reflected the repeatability of the process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 920-942
    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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