Application of Depletion Attraction in Mineral Flotation: I. Theory

Choi, Jin-Young; Kim, Hyung-Seok; Choi, Sun‐Ho; Kim, Kyu-Han; Han, Yosep; Bradford, Scott A.; Choi, Siyoung Q.; Kim, Hyun-Jung

doi:10.3390/min8100451

Cited by 12 publications

(8 citation statements)

References 79 publications

(103 reference statements)

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“…Our experimental findings may be well explained by the theoretical calculation from the accompanying article [1]. The bubble surface adsorption of depletion agents hinders mineral attachment and this occurs in a certain some PEG concentration range.…”

Section: Viscosity Effect Of a High Peg Concentration And Polyelectrosupporting

confidence: 75%

“…Figure 2 shows the floatability as a function of the PEG concentration. In general, malachite shows higher floatability than silica over all concentrations of PEG; this results from the differences in an electrostatic force of malachite and silica to the bubble because identical depletion force is expected to be present for both minerals at the same PEG concentration [1]. For malachite particles, the natural floatability is roughly 20% and adding a small amount of PEG, 5 × 10 −5 wt %, does not change this value.…”

Section: Single Minerals Of Silica and Malachitementioning

confidence: 94%

“…In the field of mineral processing, froth flotation has been the most widely used technique to improve the quality of low-grade minerals [1][2][3][4][5][6]. During this process, a collector is used to impart hydrophobicity to desired mineral particles; these hydrophobic particles are then better attached onto the surface of a bubble, leaving undesired particles in the bulk solution.…”

Section: Introductionmentioning

confidence: 99%

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Application of Depletion Attraction in Mineral Flotation: II. Effects of Depletant Concentration

Kim

Choi

et al. 2018

Minerals

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Along with the accompanying theory article, we experimentally investigate the effect of the depletion attraction force on the flotation of malachite. While varying the concentration of the depletion agent (polyethylene glycol), three different systems are studied: pure malachite, pure silica and a 1:1 mass ratio of malachite and silica binary system. We find that the recovery increases significantly as the concentration of the depletion reagents increases for all three systems. However, the recovery suddenly decreases in a certain concentration range, which corresponds to the onset of the decreased surface tension when high concentrations of the depletion agent are used. The decreased surface tension of the air/water interface suggests that the recovery rate is lowered due to the adsorption of the depletion agent to the bubble surface, acting as a polymer brush. We also perform experiments in the presence of a small amount of a collector, sodium oleate. An extremely small amount of the collector (10−10–10−5 M) leads to the increase in the overall recovery, which eventually reaches nearly 100 percent. Nevertheless, the grade worsens as the depletant provides the force to silica particles as well as target malachite particles.

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Section: Viscosity Effect Of a High Peg Concentration And Polyelectrosupporting

confidence: 75%

Section: Single Minerals Of Silica and Malachitementioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Application of Depletion Attraction in Mineral Flotation: II. Effects of Depletant Concentration

Kim

Choi

et al. 2018

Minerals

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“…Flotation is the most common method for concentrating ore, and it is based on the separation of hydrophobic materials from hydrophilic ones [11] in an extremely complicated dynamic process including interactions of gas, liquid, and solid phases under flow. Much of the research has focused on electrostatic, van der Waals, hydrophobic, and capillary interactions, but there are also other forces that have remained uninvestigated, such as depletion interaction [12].…”

Section: Flotationmentioning

confidence: 99%

Review of Potential Microbial Effects on Flotation

2020

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Microorganisms enter the flotation process mainly from intake water and ore material. The diversity and number of microorganisms can vary significantly from mine to mine. In flotation, the conditions including oxygen levels, temperature, and nutrients from ore, intake water, and reagents are often favorable for the microbial growth. The mining industry aims to close the water loops, which is expected to result in the accumulation of microorganisms in the process waters with potential effects on flotation performance. Bioflotation, bioleaching, and bio-oxidation have been studied for decades as tools for concentrating and dissolving minerals. In contrast, there is limited scientific literature or industrial knowledge about microorganisms that naturally inhabit and prevail in minerals processing applications over a wide pH range. Microorganisms affect minerals when they selectively attach to the surfaces, produce extracellular polymeric substances (EPS) and polysaccharides, oxidize or reduce the minerals, change the pH and Eh of the process solution, and degrade organic flotation chemicals. Microorganisms contain different structural components that affect their surface chemistry, charge, and behavior in flotation, but these properties may also change via adaptation and solution conditions. Almost all studies on flotation have focused on chemical and physical parameters, and the role of naturally occurring microorganisms has remained underexplored. Advances in genomics and proteomics offer possibilities to describe not only which microorganisms are present, but also which physiological functions are being exercised. This article reviews the current knowledge of microorganisms in various mineral processes, identifies potential microbe–mineral interactions in flotation, describes the gaps in current knowledge, and concludes with the potential effects of microorganisms on flotation, especially in closed water loops.

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“…The hydrophobic effect, which describes the attraction between hydrophobic molecules and surfaces that draws them together [79,107]; and • Depletion attraction forces, which occur in emulsions that have a combination of large and small droplets. According to the literature, the small droplets push the larger droplets toward each when the separation distance between the larger droplets is less than the size of the small droplets [117,119].…”

mentioning

confidence: 99%

A Review of the Processes Associated with the Removal of Oil in Water Pollution

2021

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Water plays an essential role in production and refining processes. Many industries that use petrochemicals also require water, especially for cleaning purposes. The wastewaters released by these processes are often rich in petroleum pollutants, which requires significant treatment prior to disposal. The presence of petroleum contaminants in rivers and oceans is a significant threat to human health, as well as to many animal species. A current challenge for most industries and conventional effluent treatment plants is compliance with accepted disposal standards for oil-polluted wastewater. Of particular importance is the processing of dispersed oil in water, as well as oil in water emulsion. Conventional oil and water separation methods for processing oil in water contamination have several technology gaps in terms of applicability and efficiency. The removal and effective processing of dispersed oil and emulsions from oily wastewater is a costly and significant problem. The objective of this paper is to provide a review of the principles associated with oil in water emulsion separation, with the aim of providing a more definitive understanding of the terminology, processes, and methodologies, which will assist the development of a more efficient, innovative and environmentally friendly process for the separation of oily wastewater.

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Application of Depletion Attraction in Mineral Flotation: I. Theory

Cited by 12 publications

References 79 publications

Application of Depletion Attraction in Mineral Flotation: II. Effects of Depletant Concentration

Application of Depletion Attraction in Mineral Flotation: II. Effects of Depletant Concentration

Review of Potential Microbial Effects on Flotation

A Review of the Processes Associated with the Removal of Oil in Water Pollution

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