Bubble–particle collision and attachment probability on fine particles flotation

Shahbazi, Behzad; Rezai, Bahram; Koleini, S.M. Javad

doi:10.1016/j.cep.2010.04.009

Cited by 91 publications

(30 citation statements)

References 14 publications

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“…For these fine particles, the bubble-particle detachment is often neglected. So far the effect of hydrodynamic parameters on flotation response of coarse and fine particles has been widely investigated [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Study of Relationship between Flotation Rate and Bubble Surface Area Flux using Bubble-Particle Attachment Efficiency

Shahbazi¹

2015

AJCHE

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Abstract:Understanding the attachment micro process is a fundamental step toward predicting the rate constant of flotation kinetics. In this research, the effect of bubble-particle attachment efficiency on k-S b relationship was investigated under Yoon, Stokes and Potential conditions. Maximum Stokes attachment efficiency obtained was 55.9% with particle size of -37 µm, S b of 34.2 1/s and flotation rate of 1.65 1/min. Stokes attachment efficiency was less than Yoon efficiency and it seems to be a suitable equation for predicting attachment efficiency. Furthermore, three different models were obtained for estimating attachment efficiency usingk-S b relationship.

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Section: Introductionmentioning

confidence: 99%

Study of Relationship between Flotation Rate and Bubble Surface Area Flux using Bubble-Particle Attachment Efficiency

Shahbazi¹

2015

AJCHE

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“…A baixa recuperação na flotação de partículas finas e ultrafinas é provocada por diversos fatores, dentre eles, a baixa probabilidade de colisão e adesão bolha-partícula, a dificuldade de superar a barreira energética (arraste mecânico -entrainment e entrapment), a elevada adsorção de reagentes, a baixa seletividade, a oxidação superficial e as alterações mineralógicas (Trahar e Warren, 1976;Weber e Paddock, 1983;Trahar, 1981;Schulze et al, 1989;Yoon, 2000;Rubio et al, 2004;Waters et al, 2008;Shahbazi et al, 2010;Peng et al, 2015). Pease et al (2006) O tamanho de bolha é outra variável que influência na eficiência do processo de flotação.…”

Section: Gram-positiva (A C); Gram-negativa (B D) (Adaptado Deunclassified

“…A baixa recuperação na flotação de partículas finas e ultrafinas é provocada pela baixa probabilidade de colisão e adesão bolha-partícula, dificuldade de superar a barreira energética entre elas, arraste mecânico (entrainment e entrapment), recobrimento por lamas (slimes coating), elevada adsorção de reagentes, baixa seletividade, alta área superficial por unidade de massa, baixa cinética de flotação, oxidação superficial e alterações mineralógicas (Trahar e Warren, 1976;Weber e Paddock, 1983;Trahar, 1981;Schulze et al, 1989;Yoon, 2000;Pease et al,2006;Waters, 2008;Shahbazi et al, 2010;Peng et al, 2015). Diferentes autores ao abordar a influência do tamanho de partícula na flotação, normalmente, definem o que é partícula fina ou grossa de forma indistinta, nesse sentido é importante ter cuidado quando se fala de finos e grossos.…”

Section: Influência Do Tamanho De Partícula Na Flotaçãounclassified

“…Dubel et al (1992) superficial das partículas, partículas finas têm uma maior área superficial em comparação às partículas intermediarias e grosseiras (Trahar, 1981;Yoon, 2000;Rubio et al, 2004;Pease et al, 2006;Shahbazi et al, 2010;Peng et al, 2015). …”

Section: Arraste Mecânicounclassified

“…A densidade de corrente é um fator importante que influencia na taxa de produção e diâmetro de bolhas no processo de eletroflotação (Gupta e Ali, 2012;ketkar et al, 1991;Sarkar et al, 2011;Jiménez et al, 2016 aumento da área superficial das partículas de hematita (Shahbazi et al, 2010;Peng et al, 2015). Outro fator que pode estar relacionado ao incremento da recuperação é o aumento da colisão das partículas hidrofobizadas.…”

Section: Efeito Da Densidade De Correnteunclassified

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Eletroflotação De Partículas Finas De Hematita Em Célula Modificada De Partridge Smith Usando Rhodococcus Opacus Como Biorreagente

HACHA¹

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Eletroflotação de partículas finas de hematita em célula modificada de Partridge Smith usandoRhodococcus opacus como biorreagente This work aims to evaluate the electroflotation of hematite fine particles in a modified Partridge Smith cell using Rhodococcus opacus. A hematite sample with grade 96% was used in this study; additionally, three granulometric fractions were selected: -53+38; -38+20 and -20 micrometers. The variables studied were pH, reagent concentration and current density. Zeta potential measurements and analysis by infrared spectroscopy were carried out to assess the interaction before and after reagents interaction. In order to gain a better understanding of the bubble diameter influence in the process, measurements of the diameter of hydrogen and oxygen bubbles were done. The average bubble diameter (d 32 ) was found in the range of 40 to 60 micrometers for the hydrogen bubbles and of 50 to 70 micrometers for the oxygen bubbles. Finally, electrocoagulation assays the hematite with R. opacus and sodium oleate were carried out. The reduction in particle size favored the floatability of hematite; this fact can be related to the bubble size generated in the process and the ability of R. opacus to form floccules through the interaction of Van der Waals. On the other hand, the increase of reagent concentration (R. opacus and sodium oleate) favored the floatability of hematite. Suitable pH values for hematite flotation were found around 6 and 7 for R. opacus and sodium oleate, respectively. Maximum hematite floatability with R. opacus using hydrogen bubbles was around 80% and around 65% with oxygen bubbles. Sodium oleate presented a better performance reaching a maximum floatability of approximately 98% for hydrogen bubbles and around 90% for oxygen bubbles. The characteristics of the bacterial surface and the bubble size were determinant factors in the hematite floatability. Therefore, the electroflotation process using R. opacus as collector is a potential technology regarding environmental issues found with the synthetic reagents.

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Comparison of bubble velocity, size, and holdup distribution between single‐ and double‐air inlet in jet microbubble generator

Liu

et al. 2020

Asia-Pacific J Chem Eng

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The jet microbubble generator is often used to produce bubbles in flotation equipment, which generates microbubbles by self‐absorbing or inflating. Bubble behavior is a dominant factor in froth flotation, and its velocity, size, and distribution greatly affect flotation performance. However, the asymmetry distribution of the pressure, bubble velocity, and gas holdup in generator with single inlet probably causes eccentric wear to the equipment. Therefore, in this study, using particle image velocimetry (PIV), high‐speed dynamic camera, and computational fluid dynamics (CFD) technology, the bubble behaviors in the jet microbubble generators with single inlet and double inlet was studied. The results show that under air flux of 0.4 L/min, the change of bubble diameter (D32) in two generators is obvious, reducing by 5.97% and 3.77% under circulation water flux of 1.5 and 2.5 m3/h, respectively. Comparing the influence of circulating water fluxes, the double‐inlet structure can reduce the bubble diameter more effectively. The maximum turbulent dissipation rate in the throat section of the generator with double inlet is greater than 120, while it is less than 100 in single‐inlet structure. For bubbles in generator with double inlet, velocity difference in radial direction reduces to 0.03 m/s and is more symmetrical. Meanwhile, the double‐inlet generator can also optimize the uniformity gas holdup distribution, which is beneficial to increase the collision probability of flotation and reduce the abrasion of microbubble generator.

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Bubble–particle collision and attachment probability on fine particles flotation

Cited by 91 publications

References 14 publications

Study of Relationship between Flotation Rate and Bubble Surface Area Flux using Bubble-Particle Attachment Efficiency

Study of Relationship between Flotation Rate and Bubble Surface Area Flux using Bubble-Particle Attachment Efficiency

Eletroflotação De Partículas Finas De Hematita Em Célula Modificada De Partridge Smith Usando Rhodococcus Opacus Como Biorreagente

Comparison of bubble velocity, size, and holdup distribution between single‐ and double‐air inlet in jet microbubble generator

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