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

Shahbazi, Behzad

doi:10.11648/j.ajche.s.2015030202.12

Cited by 2 publications

(1 citation statement)

References 25 publications

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“…Bubble sizes were measured by laser particle size analyzer (Master size 2000, Malvern, UK) as a widely utilized approach in the literature (Ahmadi et al, 2014;Pourkarimi et al, 2017). The average diameter of d32 (Sauter mean bubble diameter) was used to determine the mean bubble sizes, which is accepted as a well-known indicator (Shahbazi, 2015;Kracht and Moraga, 2016)…”

Section: Generating Submicron(nano) Bubblesmentioning

confidence: 99%

Study of effective parameters on generating submicron (nano)-bubbles using the hydrodynamic cavitation

Nazari¹,

Shafaei²,

Hassanzadeh³

et al. 2020

Physicochem. Probl. Miner. Process.

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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 twofold. 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.

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Section: Generating Submicron(nano) Bubblesmentioning

confidence: 99%