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    A Comparative Study of Anionic and Cationic Collector in Microbubble-Assisted Flotation for Coarse Quartz Particle: Performance and Adsorption
    (Berg Fac Technical Univ Kosice, 2024) Abbaker, Ahmed; Aslan, Nevzat
    Recent studies have suggested that using microbubbles to assist in coarse particle flotation has some advantages. However, how the type of collector affects the recovery of coarse particles under microbubbles still needs to be clarified. This study compared the performance and adsorption characteristics of anionic (sodium oleate- NaOL) and cationic (dodecylamine- DDA) collector environments for microbubble-assisted flotation of coarse quartz particles. A two- factorial level and Box-Behnken techniques were used for statistical design for screening and characterizing the performance. The flotation process utilizing NaOL and DDA was not significantly affected by froth depth. In the presence and absence of microbubbles, the performance of DDA surpassed that of NaOL; therefore, the average recovery of the cationic collector was more than 10% higher than that of the anionic collector. Contact angle analysis revealed that NaOL measured approximately 70 degrees while DDA measured around 90 degrees. DDA was adsorbed more significantly than NaOL at the same collector concentration. Zeta potential was more sensitive to DDA; increasing both collector concentrations also increased the value of zeta potential. FT-IR and EDX analyses showed that DDA and NaOL were chemically adsorbed onto quartz. Overall, this study demonstrates that DDA outperformed NaOL in the presence and absence of microbubbles during the flotation of coarse quartz particles.
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    Application of flotation kinetics models to chalcopyrite flotation: determination of optimum flotation times
    (Taylor & Francis Inc, 2024) Simsek, Selma; Kilinc, Turan; Cebeci, Yakup; Abbaker, Ahmed
    This study advances the field of flotation kinetics by deriving and comparing optimum flotation time equations for eight different kinetic models in chalcopyrite beneficiation. While Agar (1985) established the method for finding the optimum flotation time for his specific model, this research extends the application to multiple established flotation kinetic models, a calculation largely unexplored in flotation literature since Agar's work. Selective flotation data from ore samples (Gumu & scedil;hane, Turkiye) were fitted to eight kinetic models, all showing high correlation (R-2 > 0.97) with experimental results. The optimum flotation times were calculated by equating each model's recovery rate derivatives for valuable minerals and gangue. This method revealed that most models predicted optimal times between 0.8 and 1.0 min, with one model diverging at 3.1 min. The Agar kinetic model (Model 7) demonstrated a superior fit for both chalcopyrite and gangue recovery curves. By deriving equations for multiple models, the study provides a comprehensive framework for comparing and selecting appropriate kinetic models in flotation circuit design. These equations offer valuable insights into the critical nature of precise timing in chalcopyrite flotation and highlight the importance of considering multiple kinetic models for process optimization. The derived equations contribute to more efficient and sustainable chalcopyrite beneficiation techniques, which are particularly relevant for processing lower-grade copper ores in industrial applications and expanding the toolkit available for researchers and practitioners in flotation kinetics optimization. [GRAPHICS] .
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    Challenging Microbubble Assumptions: Modeling and Optimizing Coarse Quartz Flotation in a Cationic Environment
    (Shahrood Univ Technology, 2025) Abbaker, Ahmed; Aslan, Nevzat
    This work optimizes coarse particle flotation using microbubble-assisted flotation in a cationic environment created by dodecylamine (DDA). The flotation efficiency of coarse quartz particles (D50 = 495 mu m) was investigated through an examination of the interactions between microbubbles (20-30 mu m), the cationic environment, and various operational parameters. A systematic approach utilizing factorial and Box-Behnken experimental designs was employed to evaluate the effects of the multiple variables. These variables included the dodecylamine (DDA) concentration, methyl isobutyl carbinol (MIBC) concentration, impeller speed, pulp density, the addition of fine particles, and the presence of microbubbles. The DDA concentration and the impeller speed significantly impacted the coarse particle recovery, while microbubbles increased recovery by 15% under non-optimized conditions; optimization revealed a more negligible difference. The optimized conditions achieved maximum recoveries of 99.47% and 97.88% with and without microbubbles, respectively, indicating the minimal effect when other parameters were optimized. This research work shows that a careful optimization of the flotation parameters can achieve high coarse particle recovery rates, with microbubbles playing a less significant role than anticipated. These findings suggest that optimizing the conventional parameters may be more crucial than the microbubble introduction for enhancing the flotation efficiency of larger particles. The work contributes to our understanding of coarse particle flotation, and provides insights for improving the mineral processing techniques for challenging the particle sizes.
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    Effects of microbubbles and frother types on first-order flotation kinetics of coarse quartz: a Box-Behnken design study
    (Taylor & Francis Ltd, 2024) Abbaker, Ahmed; Aslan, Nevzat; Motasim, Mahmoud
    This study utilised a Box-Behnken experimental design to examine the influence of various frothers (MIBC, 2-Ethylhexanol, alpha-Terpineol, and AF-65), dodecylamine (DDA) collector, and microbubbles on coarse quartz flotation performance. The flotation efficiency was evaluated through two key parameters: maximum recovery (R infinity) and first-order rate constant (k). The findings revealed that microbubbles substantially enhanced flotation kinetics through synergistic interactions, particularly in combination with aliphatic alcohol frothers. The effectiveness of cyclic alcohol and polyglycol-type frothers varied significantly, depending on microbubble presence, frother concentration, and DDA interactions. While 2-Ethylhexanol achieved the highest recovery (97.71%) in conventional flotation without microbubbles, alpha-Terpineol exhibited the most pronounced synergistic effect when combined with microbubbles and DDA, reaching 99.71% recovery. In terms of kinetic performance, AF-65 demonstrated exceptional results in the presence of microbubbles and DDA, achieving the highest rate constant of 2.12 min-1. The effectiveness of the bubble bridging mechanism showed considerable variation across different frother types, with aliphatic alcohols exhibiting notable improvements in the presence of microbubbles, particularly at lower concentrations. Although increased DDA concentrations generally resulted in decreased flotation rates, they enhanced overall recovery - an effect that was further amplified by the presence of microbubbles. Cette & eacute;tude a utilis & eacute; une conception exp & eacute;rimentale de Box-Behnken pour examiner l'influence de divers moussants (MIBC, 2-& eacute;thylhexanol, terpin & eacute;ol-alpha et AF-65), du collecteur dod & eacute;cylamine (DDA) et de microbulles sur les performances de flottation du quartz grossier. On a & eacute;valu & eacute; l'efficacit & eacute; de flottation au moyen de deux param & egrave;tres cl & eacute;s: la r & eacute;cup & eacute;ration maximale (R infinity) et la constante cin & eacute;tique de premier ordre (k). Les r & eacute;sultats ont r & eacute;v & eacute;l & eacute; que les microbulles am & eacute;lioraient consid & eacute;rablement la cin & eacute;tique de flottation par des interactions synergiques, particuli & egrave;rement en combinaison avec des moussants d'alcool aliphatique. L'efficacit & eacute; des moussants de type alcool cyclique et polyglycol variait de mani & egrave;re significative, d & eacute;pendant de la pr & eacute;sence de microbulles, de la concentration du moussant et des interactions du DDA. Tandis que le 2-& eacute;thylhexanol atteignait la r & eacute;cup & eacute;ration la plus & eacute;lev & eacute;e (97.71%) dans la flottation conventionnelle sans microbulles, le terpin & eacute;ol-alpha pr & eacute;sentait l'effet synergique le plus prononc & eacute; lorsque combin & eacute; avec des microbulles et du DDA, atteignant une r & eacute;cup & eacute;ration de 99.71%. En termes de performance cin & eacute;tique, AF-65 a d & eacute;montr & eacute; des r & eacute;sultats exceptionnels en pr & eacute;sence de microbulles et de DDA, atteignant la constante cin & eacute;tique la plus & eacute;lev & eacute;e de 2.12 min-1. L'efficacit & eacute; du m & eacute;canisme de pontage des bulles a montr & eacute; une variation consid & eacute;rable parmi les diff & eacute;rents types de moussants, les alcools aliphatiques pr & eacute;sentant des am & eacute;liorations notables en pr & eacute;sence de microbulles, particuli & egrave;rement & agrave; des concentrations plus faibles. Bien que les concentrations accrues de DDA avaient g & eacute;n & eacute;ralement pour r & eacute;sultat une diminution des taux de flottation, elles am & eacute;lioraient la r & eacute;cup & eacute;ration globale-un effet davantage amplifi & eacute; par la pr & eacute;sence de microbulles.
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    Reaction kinetics of molybdenum dissolution by hydrogen peroxide in acidic and alkaline solutions using tartaric acid and sodium hydroxide: A semi-empirical model with rotating disc method
    (Wiley, 2024) Motasim, Mahmoud; Agacayak, Tevfik; Eker, Yasin Ramazan; Aydogan, Salih; Abbaker, Ahmed
    Molybdenum is an amphoteric metal that dissolves in both acidic and alkaline solutions. This fundamental study explores a sustainable process for the dissolution of molybdenum, focusing on the reaction kinetics in H2O2, H2O2-NaOH, and H2O2-C4H6O6 solutions. A rotating disc method was applied with the Levich's equation. Semi-empirical models with activation energy were developed for the H2O2-NaOH and H2O2-C4H6O6 solutions. The study examined the effects of rotating speed, disc surface area, temperature, H2O2, NaOH, and C4H6O6 concentrations, along with rotating speed, disc surface area, and temperature. Hydrogen peroxide significantly impacted molybdenum dissolution rates across all three solutions. The reaction order of hydrogen peroxide concentration in the H2O2 solution was greater than that of the H2O2-NaOH and H2O2-C4H6O6 solutions. The complex of molybdenum peroxo was formed in H2O2 and H2O2-NaOH solutions but decomposed at a temperature >= 50 degrees C. The activation energies were determined to be 49.90, 43.60, and 41.10 kJ/mol for the H2O2, H2O2-NaOH, and H2O2-C4H6O6 solutions. Molybdenum dissolution in H2O2-NaOH solution. image