Abstract:This paper presents the determination of a concentration at the minimum bubble velocity (CMV) for different types of frothers, such as straight and branched alkyl chain aliphatic alcohols, 1,ω-diols, poly(propylene glycol) and poly(ethylene glycol) alkyl ethers, n-alkyltrimethylammonium bromides, commercial frothers and others. The values of terminal rise bubble velocity were reviewed from the experimental data published in the literature for two different types of columns, i.e., a short PAS (used in Polish Ac… Show more
“…Since the change of the bubble size in the vicinity of CCC is not sharp, usually CCC 95 , that is the frother concentration at which the average bubble size drops 95% is used. The third method of CCC determination is based on normalization of the bubble size vs. concentration plot using a mathematical equation approximating the whole curve (CCC t ) [43]. The selected values of CCC are presented in Table 11.…”
Section: Kpf6mentioning
confidence: 99%
“…They are concentration at half of the maximum foam height (CMH) [52] determined from the foam height-concentration curve; foam time of life [17]; concentration at minimum bubble velocity (CMV) [43,53] based on the bubble velocity-concentration curve, dynamic stability factor (DSF) [54], Bikerman's foaminess unit Σ(reference) and Sun's frothability index [50]. …”
Section: Other Parameters Used For Frother Classificationmentioning
Abstract:In this paper, a scheme of flotation frothers classification is presented. The scheme first indicates the physical system in which a frother is present and four of them i.e., pure state, aqueous solution, aqueous solution/gas system and aqueous solution/gas/solid system are distinguished. As a result, there are numerous classifications of flotation frothers. The classifications can be organized into a scheme described in detail in this paper. The frother can be present in one of four physical systems, that is pure state, aqueous solution, aqueous solution/gas and aqueous solution/gas/solid system. It results from the paper that a meaningful classification of frothers relies on choosing the physical system and next feature, trend, parameter or parameters according to which the classification is performed. The proposed classification can play a useful role in characterizing and evaluation of flotation frothers.
“…Since the change of the bubble size in the vicinity of CCC is not sharp, usually CCC 95 , that is the frother concentration at which the average bubble size drops 95% is used. The third method of CCC determination is based on normalization of the bubble size vs. concentration plot using a mathematical equation approximating the whole curve (CCC t ) [43]. The selected values of CCC are presented in Table 11.…”
Section: Kpf6mentioning
confidence: 99%
“…They are concentration at half of the maximum foam height (CMH) [52] determined from the foam height-concentration curve; foam time of life [17]; concentration at minimum bubble velocity (CMV) [43,53] based on the bubble velocity-concentration curve, dynamic stability factor (DSF) [54], Bikerman's foaminess unit Σ(reference) and Sun's frothability index [50]. …”
Section: Other Parameters Used For Frother Classificationmentioning
Abstract:In this paper, a scheme of flotation frothers classification is presented. The scheme first indicates the physical system in which a frother is present and four of them i.e., pure state, aqueous solution, aqueous solution/gas system and aqueous solution/gas/solid system are distinguished. As a result, there are numerous classifications of flotation frothers. The classifications can be organized into a scheme described in detail in this paper. The frother can be present in one of four physical systems, that is pure state, aqueous solution, aqueous solution/gas and aqueous solution/gas/solid system. It results from the paper that a meaningful classification of frothers relies on choosing the physical system and next feature, trend, parameter or parameters according to which the classification is performed. The proposed classification can play a useful role in characterizing and evaluation of flotation frothers.
“…Szeroka analiza wartości stężeń granicznych pęcherzyków gazowych przeprowadzona została przez Kowalczuka i współpracowników [53], na podstawie eksperymentalnych danych prędkości granicznych alkoholi alifatycznych, 1,-dioli, eterów alkilowych poli(glikolu propylenowego) oraz poli(glikolu etylenowego), bromków n-alkilotrimetyloamonionych jak również komercyjnych spieniaczy flotacyjnych. Na podstawie analizy danych dotyczących prędkości granicznych, wykazano, że graniczne stężenie powodujące całkowite unieruchomienie powierzchni poruszającego się pęcherzyka zależą bardzo wyraźnie od rodzaju surfaktantu.…”
Section: Ruch Pęcherzyka -Dynamiczna Warstwa Adsorpcyjnaunclassified
“…Wykazano ponadto, że niezależnie od rodzaju surfaktantów kluczową rolę w tym zjawisku odgrywają ich właściwości powierzchniowe, ponieważ jeśli znormalizuje się stężenia surfaktantów względem wartości ich CMV, wszystkie wyniki zbiegają się w jedną uniwersalną krzywą. Analiza wyników przedstawiona w pracy [53] umożliwiła także wyprowadzenie równania w formie:…”
Section: Ruch Pęcherzyka -Dynamiczna Warstwa Adsorpcyjnaunclassified
Publikacja ta dedykowana jest prof. Bogdanowi Burczykowi z podziękowaniami za wieloletnią owocną współpracę naukową oraz Jego wyjątkową życzliwość i przyjaźń (K. Małysa)
“…More recently, an empirical equation was established to correlate the terminal bubble velocity–frother concentration curve by knowing the maximum (V max ) and minimum (V min ) velocities, as well as the values of CMV:…”
Bitumen flotation hydrodynamics in water‐based oil sand extraction is critically reviewed by comparing aeration of oil sand slurries with mineral flotation. The role of the two‐stage particle‐bubble attachment model in flotation is emphasized as a means to accelerate bitumen flotation recovery. It involves the generation of micro/nanobubbles and their frosting on hydrophobic bitumen droplets, followed by their attachment to a flotation‐size bubble via its coalescence with the nanobubbles frosted on the bitumen. Nanobubble generation by hydrodynamic cavitation demonstrates that the size of nanobubbles can be reduced, and the number of nanobubbles increased by fast liquid flow, intensified agitation, high dissolved gas content and surfactant concentration. The mechanism of pre‐existing gas nuclei in enhancing nanobubble generation by cavitation is utilized to produce a large volume of stabilized nanobubbles for practical flotation, by continuously recirculating the stream through a gas saturation tank or a cavitation tube. The aeration of oil sand slurries in hydrotransport pipelines is analyzed based on its similarity to dissolved air flotation. Bitumen extraction recovery increased significantly with the presence of nanobubbles in the system. The role of improved flotation hydrodynamics in bitumen recovery is briefly discussed in terms of the Suncor operation using flotation columns to process oil sand middling streams. Future research should be directed at understanding bitumen flotation kinetics, optimizing size ranges of nanobubbles for maximized flotation recovery, minimizing wearing of cavitation tubes in industrial operations, and intensifying the role of in‐situ nanobubble nucleation on hydrophobic particles/bitumen droplets in flotation, especially for bitumen extraction from underperforming oil sands.
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