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    Wyświetlanie 1-8 z 8
    Tytuł:
    An investigation of continuous interaction process between air bubble and various roughness coal surfaces using microbalance
    Autorzy:
    Guo, Zhimin
    Yang, Jianguo
    Wang, Yuling
    Powiązania:
    https://bibliotekanauki.pl/articles/1450050.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    surface roughness
    air bubble
    contact angle
    continuous interaction
    Opis:
    Surface roughness of particles plays an important role in bubble-particle interaction process. However, the continuous attachment and detachment process have rarely been characterized between the surface of different roughness and air bubble. In this study, the continuous attachment and detachment processes between the surface of different roughness and air bubble were investigated by a highly sensitive microbalance. The bubble–surface interaction process was monitored by a high-speed camera to analyze the geometry parameters, including distance, adhesion diameter, and contact angle. It was found that the bubble-particle attachment time increased with the increase of surface roughness. The magnitude of the repulsive force in the bubble-surface approaching process increased with the increase of surface roughness, while the attractive force in the bubble-particle retracting process decreased monotonically with the surface roughness. The force measured by microbalance was finally compared with the calculated one. The calculated force at the biggest force point also increased with the decrease of surface roughness. These results indicate that coal particles with lower surface roughness, which have less water-filled pores and pillars, is more conducive to flotation due to the lower repulsive force in the bubble-particle attachment process and higher adhesive force in the bubble-particle detachment process, and vice versa.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 11-23
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationships between atmospheric positive electric charge densities and gas bubble concentrations in the Baltic Sea
    Autorzy:
    Klusek, Z.
    Wiszniewski, A.
    Jakacki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48266.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    wind speed
    gas bubble
    concentration
    atmospheric electricity
    Baltic Sea
    air ion
    brackish water
    Opis:
    Simultaneous measurements of bubble density in the sea subsurface and positive ions in the lower atmosphere were performed in the Baltic Sea in the summer of 1999. Bubbles in two size ranges, around 27 and 100 μm, were measured acoustically. Airborne positive charge was measured with a Gerdien instrument. Observed concentrations of air ions varied from 60 cm−3 up to 600 cm−3. The relative role of bubbles and wind speed on the positive air ion concentrations over the brackish water of the Baltic Sea is discussed. The parameters of a model of a log-log dependence between charge concentration and bubble density are calculated. The correlation functions between time series of concentrations of positive charges over the sea and gas bubbles averaged over a depth range from 0.4 to 4 m and wind speed are presented. There was zero lag between the cross-correlation maxima of charge and bubbles, but there was a phase lag of one and a half hours between charge and wind speed.
    Źródło:
    Oceanologia; 2004, 46, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    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:
    Hydrodynamics of Pilot Plant Scale Airlift Reactor in Presence of Alcohols
    Autorzy:
    Nandi, S.
    Jaju, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779781.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    air-lift reactor
    hydrodynamics
    gas hold-up
    bubble
    multiphase flow
    surfactant
    Opis:
    The overall gas hold-up of a pilot plant scale internal loop airlift reactor was studied in presence of different alcohols in varied concentration. It has been observed that these simple alcohols can enhance overall gas hold-up of the airlift assembly possibly due to formation of protective thin layer over smaller gas bubbles thereby reducing chance of their coalescence. As the alcohols can be used as food source for the micro organisms present in the system, this green and environment friendly process have potential to replace usage of hazardous surfactants often used for enhancing overall hold-up in order to obtain desired mass transfer characteristics. An empirical relationship encompassing overall gas hold-up of the reactor as a function of superficial gas velocity and alcohol concentration is also developed.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 118-123
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of air flow rate and froth depth on the flotation performance : an industrial case study in a 10 m3 cell
    Autorzy:
    Ostadrahimi, Mahdi
    Farrokhpay, Saeed
    Pirmoradi, Saeed
    Noparast, Mohamad
    Powiązania:
    https://bibliotekanauki.pl/articles/2146876.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    entrainment
    bubble coalescence
    air flow rate
    froth depth
    Opis:
    The main purpose of the froth zone in flotation is to transport all the valuable particles from the pulp zone into the concentrate. However, in practice, a complete recovery of these particles is rarely achieved since some of them are detachment from the bubbles and return to the pulp zone. While this is an important topic in the mineral flotation industry, the previously published papers are mainly limited to small laboratory scales. Therefore, this study aimed to examine the effect of two main flotation variables (air flowrate and froth depth) on the flotation of iron ore in a 10 m3 industrial scale cell. It was found that, when the air flowrate increased from 45 to 146 m3/h, the velocity of the bubble coalescence also increased. In addition, when the froth depth increased from 5 to 30 cm, the product grade showed on average 2 unit increase (for instance, from 12% to 14%) due to the detachment of particles and liquid drainage. It was also found that the flotation concentrates recovery decreased with the increasing froth depth and air flowrate.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 154852
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of salinity on the underwater noise generated by small scale air entrainment events
    Autorzy:
    Szuszkiewicz, J.
    Klusek, Z.
    Gorska, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/332616.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    underwater noise
    air entrainment
    bubbles
    bubble clusters
    Opis:
    Some part of the energy released in the wave breaking process is transformed into the energy of the noise. This sound depends on the water properties, however, there is a lack of reliable data concerning the underwater noise generated by less energetic events. The aim of this study was to understand the impact of salinity on the underwater noise produced during small scale air entrainment events, typical for low wind speed conditions. The tipping trough experiment was performed in a small tank to generate the small scale air injections. Four, linearly placed hydrophones HTI-96-MIN were used to record the acoustic noise accompanying this phenomenon. The bubble plume development, and underwater noise spectra, were compared for salty and fresh water. The potential energy of the modeled events resulted in different spectra, and salinity played an essential role in the emitted underwater noise.
    Źródło:
    Hydroacoustics; 2017, 20; 167-172
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dodecyl amine adsorption at different interfaces during bubble attachment/detachment at a silica surface
    Autorzy:
    Wang, X.
    Miller, J. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/110684.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    VSFS
    air bubble attachment
    amine adsorption density
    Opis:
    The reverse flotation of quartz and other gangue silicate minerals with alkyl amines is an important and well known strategy for the processing of iron ore, low grade bauxite ore, and phosphate rock. Some details of amine adsorption by quartz have been described in the literature, but little is known about the disposition of amine during bubble attachment. Now, a new experimental procedure involving vibrational sum frequency spectroscopy (VSFS) has been developed to provide, for the first time, a more detailed analysis of the state of dodecyl amine (DDA) adsorption at different interfaces during bubble attachment/detachment at a silica surface. The results show that the hydrophobic surface state at the silica surface is created by the transfer of a well-organized monolayer of DDA from the bubble surface to the silica surface during bubble contact and attachment.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 1; 81-88
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental design of oily bubbles in oxidized coal flotation
    Projekt eksperymentalnej flotacji olejowej utlenionego węgla
    Autorzy:
    Xia, W.
    Yang, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849690.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    pęcherzyk oleisty
    pęcherzyk powietrza
    flotacja
    węgiel utleniony
    oily bubble
    air bubble
    oxidized coal
    flotation
    design
    Opis:
    Węgiel kamienny jest bardzo trudno wzbogacalny w procesie konwencjonalnej flotacji z zastosowaniem odczynników (kolektorów) olejowych. Badania miały na celu zaprojektowanie procesu flotacji, nazywanej flotacją olejową, do zwiększenia efektywności wzbogacania utlenionego węgla. Opisano proces flotacji olejowej. Badania dotyczyły porównania flotacji olejowej i konwencjonalnej do wzbogacania utlenionego węgla. Niektóre właściwości utlenionego węgla są podobne do właściwości węgla brunatnego. Odczynniki flotacyjne (kolektory) mają wielki wpływ na proces utlenionego węgla. Flotowalność utlenionego węgla z Taixi (Chiny) może być poprawiona przez aktywację powierzchni bądź rozdrabnianie węgla. Wstępna obróbka mikrofalowa może zwiększyć hydrofobowość węgla utlenionego poprzez zmniejszenie zawartości wilgoci w węglu utlenionym. Wyniki pokazują, że flotacja z pęcherzykami oleistymi jest bardziej efektywna, gdyż uzyskuje się substancję organiczną (koncentraty węgla) o wyższej zawartości substancji palnych niż w konwencjonalnym procesie flotacji. Wskaźnik efektywności procesu przy zastosowaniu flotacji olejowej jest również wyższy niż przy zastosowaniu konwencjonalnej flotacji.
    Oxidized coal is difficult to float using oily collectors in the conventional flotation process. This study was aimed at designing the flotation process, namely the oily bubble flotation process, to float oxidized coal efficiently. The flotation process using oily bubbles is thoroughly described. The study compared using oily bubbles and air bubbles to float oxidized coal. Some properties of oxidized coal are similar to lignite. Therefore, oxidized coal should also be recovered efficiently. The flotation collectors have a great effect on the flotation process of oxidized coal. The floatability of Taixi oxidized coal can be improved by surface activation or grinding. The microwave pretreatment can improve the hydrophobicity of oxidized coal by decreasing the moisture content of oxidized coal. The flotation results show that the oily bubble flotation process can obtain higher combustible matter recovery than the conventional flotation process. The flotation efficiency index using oily bubbles is also higher than that using air bubbles.
    Źródło:
    Gospodarka Surowcami Mineralnymi; 2013, 29, 4; 129-135
    0860-0953
    Pojawia się w:
    Gospodarka Surowcami Mineralnymi
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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