Flotation Surfactants

Leja, J.

doi:10.1007/978-1-4615-7975-5_5

Cited by 41 publications

(65 citation statements)

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“…It is well known that a small object can float on a liquid medium that has a lower density. This phenomenon is critical to a number of both naturally occurring and man-made processes, from water-walking and meniscus-climbing of insects and spiders 1 2 3 to separating gold, diamond and many other valuable minerals from rocks by froth flotation using air bubbles 4 5 . For solid objects, numerous studies have verified the modified Archimedes principle that includes the role of the surface tension of the liquid.…”

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confidence: 99%

Floating mechanism of a small liquid marble

Ooi

Plackowski

Nguyen

et al. 2016

Sci Rep

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Flotation of small solid objects and liquid droplets on water is critical to natural and industrial activities. This paper reports the floating mechanism of liquid marbles, or liquid droplets coated with hydrophobic microparticles. We used X-ray computed tomography (XCT) to acquire cross-sectional images of the floating liquid marble and interface between the different phases. We then analysed the shape of the liquid marble and the angles at the three-phase contact line (TPCL). We found that the small floating liquid marbles follow the mechanism governing the flotation of solid objects in terms of surface tension forces. However, the contact angles formed and deformation of the liquid marble resemble that of a sessile liquid droplet on a thin, elastic solid. For small liquid marbles, the contact angle varies with volume due to the deformability of the interface.

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confidence: 99%

Floating mechanism of a small liquid marble

Ooi

Plackowski

Nguyen

et al. 2016

Sci Rep

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“…Saponified vegetable oils are surfactants widely used in flotation as a collector. They are composed of mixtures of carboxylic acids (RCOOH) of long hydrocarbon chain, which presents a hydrophobic character, and the carboxyl polar group, which is hydrophilic (Leja, 1982;Pearse, 2005). Soaps or salts of these oils, obtained by saponification, are used in the anionic flotation of slightly soluble and oxide minerals (Kulkarni and Somasundaran, 1980;Guimarães et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

“…Soaps or salts of these oils, obtained by saponification, are used in the anionic flotation of slightly soluble and oxide minerals (Kulkarni and Somasundaran, 1980;Guimarães et al, 2005). Starches of different origins are used as depressants in several flotation systems (Leja, 1982;Hanna and Somasundaran, 1976). Nunes and Peres (2011) point them out as being excellent carbonate depressants.…”

Section: Methodsmentioning

confidence: 99%

Dolomitic BIF beneficiation of Conceição - MG mine

2019

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In the Conceição-MG mine, there are significant reserves of dolomitic itabirite, which is considered overburden material. This study aimed to develop a flotation route for the concentration of this dolomitic BIF according to the requirements of the steel industry. The characterization of samples, comminution, liberation size, microflotation of the pure dolomite and hematite minerals were performed to establish the conditions for selective separation in bench flotation tests. The microflotation tests showed that the soybean oil at pH 6 preferably floats the dolomite in relation to the hematite. The corn starch depressant at a pH higher than10 preferably depresses the hematite relative to the dolomite. The bench flotation tests revealed interactions between the factors pH, percentage of solids in the pulp, soybean oil and starch dosage. The optimal results for bench flotation tests were achieved under the following conditions: pH at 10.5, percentage of solids of 27wt%, dosages of soybean oil and corn starch of 400g/ton and 351g/ton, respectively.

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“…It is worth pointing out that the modified starch I and II are produced with the introduction of positive charges in its molecules by means of a cationizing reaction with the use of reagents containing imine, amine, ammonium and sulphonium groups, being the degree of substitution the parameter that tells them apart (Bertolini, 2010). On the other hand, dextrin is obtained by means of a treatment which breaks and reverses the molecular chain of the starches by enzymatic or thermal degradation under acid conditions (Leja, 1982). According to the manufacturers, the amylopectin content in the cassava and corn starch are 83 and 74%, respectively.…”

Section: -Characterization Of the Samplementioning

confidence: 99%

Use of depressants in the direct flotation of a silicate-carbonate phosphate ore

Souza

Albuquerque

Lameiras

et al. 2014

Rem: Rev. Esc. Minas

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A high demand for mineral resources observed in recent decades has led to an expansion in production in the mining industry. Different process alternatives have been proposed for selective separation between apatite and contaminants (carbonates and silicates) present in phosphate ores. Magnetic separation, calcination and gravity separation processes are methods that present low efficiency and high cost. Flotation is the most common process; however the selectivity is hampered by the superficial similarity of the chemical composition of phosphates and carbonates, high surface activity of the collectors used, interactions between dissolved ionic species of certain mineral with another and also interactions between dissolved ionic species and reagents. In this study, conducted in a laboratory scale, eight different depressants, organic and inorganic, were tested in the direct flotation of a Brazilian silicate-carbonate phosphate ore. The best performance in the depression of calcite and silicates was achieved with cassava starch. ResumoA forte demanda por bens minerais verificada nas últimas décadas tem levado o setor mineral a ampliar sua capacidade produtiva. Diferentes métodos de concentração têm sido propostos para separação seletiva da apatita dos contaminantes carbonatos e silicatos presentes em minérios fosfáticos. Separação magnética, hidrogravimétrica e calcinação são métodos que apresentam baixa eficiência e custo elevado. A flotação é o método mais indicado, porém a seletividade é dificultada devido à similaridade da composição química superficial entre fosfatos e carbonatos, a alta atividade superficial dos coletores utilizados, interações entre espécies iônicas dissolvidas de um mineral sobre outro e, também, entre espécies iônicas dissolvidas e reagentes. Nesse estudo, realizado em laboratório, oito diferentes depressores, orgânicos e inorgânicos, foram testados na flotação aniônica direta de um fosfato sílico-carbonatado. O melhor desempenho foi obtido com fécula de mandioca, que exerceu boa depressão sobre a calcita e os silicatos. Palavras chave:Flotação; depressores; fosfato sílico-carbonatado.

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Flotation Surfactants

Cited by 41 publications

References 0 publications

Floating mechanism of a small liquid marble

Floating mechanism of a small liquid marble

Dolomitic BIF beneficiation of Conceição - MG mine

Use of depressants in the direct flotation of a silicate-carbonate phosphate ore

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