Bubble–particle collision interaction in flotation systems

Brabcová, Zuzana; Karapantsios, Thodoris D.; Kostoglou, Margaritis; Basařová, Pavlína; Matis, K. A.

doi:10.1016/j.colsurfa.2014.11.040

Cited by 67 publications

(21 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fine particles will be carried along the streamlines and will not make a close encounter with a bubble, unless they cross the streamlines by executing Brownian motion. It was shown that microhydrodynamic drag has a distinct role in matching experiments with predictions . It was proposed (during an Advanced Study Institute in Cornwall, UK) that fine particle recovery may be enhanced by using fine bubbles, generated by two techniques originating from effluent treatment …”

Section: Applications and Discussionmentioning

confidence: 99%

A perspective on flotation: a review

Peleka

Gallios

Matis

2017

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

The problem of fine particles processing has become important both in mineral processing and also for water and wastewater engineering. It is accepted, on the other hand, that the bubble–particle collection efficiency increases with decreasing bubble size. A decrease in bubble size can be obtained using different methods (dispersed‐air, where electroflotation is included, and/or dissolved‐air flotation), as discussed. Following an introduction of the subject, older laboratory results are presented in this review paper (based on 4 decades of experience), explaining the above, giving further ideas and possibly, assisting future researchers in the area. Examples given are: separation of fine mineral particles (such as pyrite and magnesite), and of metal ions (as chromium, arsenic, copper, zinc, germanium and so on); among the various available techniques, mention is given to ion, precipitate, adsorbing colloid, sorptive and biosorptive flotation ‐ including certain comparisons for the same application. The metal ion flotation application deserves further study and work, mainly for selective removal. © 2017 Society of Chemical Industry

show abstract

Section: Applications and Discussionmentioning

confidence: 99%

A perspective on flotation: a review

Peleka

Gallios

Matis

2017

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…The association may include three processes: 1) collision between air bubbles and particles, 2) attachment of the particles to the bubbles, and 3) detachment of the particles from the bubbles [87,88]. Interception was reported to be the dominant collision mechanism, with gravity and inertia gradually gaining importance as the particle size increases [89]. The attachment of particles to air bubbles is considered to be the key to successful flotation since this attachment determines the selective separation between hydrophobic and hydrophilic particles [87,90,91].…”

Section: Association Of Water-soluble Mineral Particles With Bubblesmentioning

confidence: 98%

Some physicochemical aspects of water-soluble mineral flotation

Wang

Liu

et al. 2016

Advances in Colloid and Interface Science

View full text Add to dashboard Cite

“…Recently, a work of single bubble-single particle interactions was reported being of interest to flotation applications [34]. An experimental device was developed where a standing bubble was approached at prescribed flow velocity by an aqueous dispersion of particles-much smaller than the bubble.…”

Section: Trends In Green Chemistrymentioning

confidence: 99%

“…a dispersed-air technique) is the commonly used one for the separation of valuable from gangue minerals [32]. A machine vision system was developed Recently, a work of single bubble-single particle interactions was reported being of interest to flotation applications [34]. An experimental device was developed where a standing bubble was approached at prescribed flow velocity by an aqueous dispersion of particles-much smaller than the bubble.…”

Section: Particle Size and Flotationmentioning

confidence: 99%

Research Activities Related to Flotation Process

Ka¹

2015

Trends in Green chem

View full text Add to dashboard Cite

Flotation initially originated from the field of mineral processing. The importance of this process to the economy of the whole industrial world is considered to be enormous. Since for many years various particulate solids besides minerals have been extracted by using this effective gravity separation method with many interesting applications in the treatment of wastewater, looking for sustainability. Certain significant activities in flotation research were reviewed in the present, with main focus in the contribution of physical chemistry to flotation; i.e. zeta-potential measurements, contact angle etc., including examining the role of bubble and particle size played with regard to the process. Alternative bubble generation methods were examined, such as electro flotation and dissolved-air flotation-the latter technique is mainly intended for water treatment applications.Keywords: Hydrophobicity, Dissolved-air flotation, Electroflotation, Biosorption, Waste water IntroductionLet us start this chapter by saying that flotation is really an old process: the historian Herodotus in ancient Greece is probably the first person that described a process similar to flotation, in the 5 th century B.C., for the separation of gold particles from sand using fatty substances. And later, in the 15 th century A.D., the Arabs used resins for the selective separation of azurite (a copper mineral) from gangue. These are considered to be the main historical roots of flotation, which is based on the idea of applying rising gas bubbles as the transport medium [1]. The attachment of bubbles to particles transfers the solids from the body of water to the surface.Hydrophobicity refers to the property of a molecule, cluster, micro-organism or mineral surface that is repelled from a mass of water. Further, it was noted that the term hydrophobicity (a Greek word) has been differently understood in various fields [2]. Floatability and hydrophobicity, however, are inter-related, focusing often on the application of collectorless flotation. Attention may be paid to a series of relevant reviews on the area [3][4][5][6]. Below a brief survey is given on selected recent papers for different applications of flotation, from a really vast literatureshowing well (as we believe) that chemistry contributes in various ways in flotation research. Coal beneficiation is one of the most effective methods for removing minerals, such as gangues and pyrite, and pollutants such as sulfur, before the burning of coal.In general, the beneficiation process of low rank coals (about the 50% of the world's total coal deposits) is more difficult to achieve than that of bituminous and/or anthracite coals. Lignite is the most important mineral commodities for Greece, according to Anastassakis [7]; its reserves approach to about 4000 Mt. It was pointed out that in the future effective reagents should be invented for effective flotation process (being a physico-chemical one) [8]. A better understanding of the surface chemistry of sulfidewater interfaces was tried...

show abstract

Bubble–particle collision interaction in flotation systems

Cited by 67 publications

References 23 publications

A perspective on flotation: a review

A perspective on flotation: a review

Some physicochemical aspects of water-soluble mineral flotation

Research Activities Related to Flotation Process

Contact Info

Product

Resources

About