A review of hematite flotation using 12-carbon chain collectors

Quast, Keith

doi:10.1016/s0892-6875(00)00119-9

Cited by 63 publications

(25 citation statements)

References 19 publications

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“…The surface complexes of hydroxamic acid and metal species on mineral surface were also reported [8][9][10][11][12]. As a result, hydroxamic acids such as octyl hydroxamic acid (OHA), benzohydroxamic acid and salicylhydroxamic acid have been widely used as collectors for flotation recovery of metal oxide minerals including copper [13], tin [8], iron [14], tungsten [15], and rare earth minerals [9].…”

Section: Introductionmentioning

confidence: 99%

A novel collector 2-ethyl-2-hexenoic hydroxamic acid: Flotation performance and adsorption mechanism to ilmenite

Zhong

Tang

et al. 2015

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

A novel collector 2-ethyl-2-hexenoic hydroxamic acid: Flotation performance and adsorption mechanism to ilmenite

Zhong

Tang

et al. 2015

Applied Surface Science

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“…There is divergence with respect to the adsorption mechanism of organic sulfates in mineral surfaces. Quast (2000) quotes several authors who believe in physical adsorption based on results that indicate that the flotation of hematite (Fe 2 O 3 ) is only possible in areas with a positive charge. In turn, Mishra (1988) reported that organic sulfates form insoluble salts with several cations.…”

Section: Introductionmentioning

confidence: 99%

Lead recovery by flotation with sodium lauryl sulfate

Morais¹,

Baltar²,

Pereira

2013

Rem: Rev. Esc. Minas

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ResumoO processo metalúrgico para reciclagem de chumbo, a partir de baterias automotivas usadas, gera uma escória constituída, basicamente, por ferro e chumbo. A recuperação do chumbo contido nesse material descartado é de grande interesse econômico e ambiental. O trabalho teve, como objetivo, estudar a possibilidade de recuperar o chumbo através de flotação com sulfato lauril de sódio (SLS). A fim de se verificarem as condições mais favoráveis para a seletividade, procurou-se identificar o mecanismo de adsorção do SLS, nas partículas de chumbo e de ferro. A adsorção foi monitorada por meio de determinações de potencial zeta e tensão superficial. Foram realizados testes de flotação nas condições identificadas como mais promissoras para a seletividade. Os resultados sugerem que o SLS adsorve-se, quimicamente, à superfície das partículas de chumbo. O aumento do pH favorece a adsorção, possibilitando uma recuperação de 79% do chumbo contido com apenas 10 Abstract Lead recoverable slag is of economic and environmental importance. The aim of this study was to assess the possibilities of its recovery by flotation with sodium lauryl sulfate (SLS

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“…19,23 Research into surfactant adsorption on minerals over the past fifty years has yielded valuable information on the adsorption characteristics of minerals, and the mechanisms governing them, 4-6,24-30 including the insoluble metal oxide hematite. 31 Early studies of the adsorption onto hematite of anionic surfactants (such as carboxylic acids, soaps, and hydroxamates) and cationic surfactants (such as quaternary ammonium salts) were interpreted in terms of physical adsorption, via an electrostatic mechanism. 32 Kallay et al 33 measured the adsorption density of SDS on a synthetic hematite as a function of pH, using a calorimetric technique.…”

Section: Introductionmentioning

confidence: 99%

In Situ Mechanistic Study of SDS Adsorption on Hematite for Optimized Froth Flotation

Bai

Hankins

Hey

et al. 2004

Ind. Eng. Chem. Res.

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An in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) technique has been developed to study the adsorption of sodium dodecyl sulfate (SDS) onto pure, colloidal hematite as a function of both concentration and pH. The absorption bands of methyl and methylene groups are most reliable for quantifying adsorption unambiguously. The infrared spectral results have been correlated with -potential studies to establish an absence of adsorption above the iso-electric point of 7.3, and to indicate that the mechanism of adsorption is physical, involving reversible electrostatic and hydrophobic forces. In the same way, there is no evidence for the existence of chemisorption. This is supported in the spectral results by the absence of shifts in relative band intensities and the absence of new adsorption bands. At low pH and high SDS concentrations, the adsorption is sufficient to cause a reversal in sign of the -potential. Spectral absorption measurements should be made under in situ conditions to obtain unambiguous results. Studies of adsorption on natural hematite indicate a high depletion of SDS from solution at low pH; the measurements are consistent with precipitation losses due to the presence of calcium and ferric ions. This precipitation leads to a drop in flotation recovery. At high pH, adsorption occurs onto mineral particles which have become coated with carbonate mineral, leading to a flat variation of recovery with pH. The results have enabled optimum flotation conditions to be defined. Recovery can be directly related to adsorption density at moderate pH below the iso-electric point. The optimum pH for flotation is 5; extremes of pH are detrimental to flotation recovery of pure mineral and should be avoided. Low pH causes surfactant precipitation, while high pH will lead to surface transformation of the mineral. A collector concentration of 0.05 times the critical micelle concentration, corresponding to partial monolayer coverage on the hematite surface, is sufficient to ensure good recovery.

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A review of hematite flotation using 12-carbon chain collectors

Cited by 63 publications

References 19 publications

A novel collector 2-ethyl-2-hexenoic hydroxamic acid: Flotation performance and adsorption mechanism to ilmenite

A novel collector 2-ethyl-2-hexenoic hydroxamic acid: Flotation performance and adsorption mechanism to ilmenite

Lead recovery by flotation with sodium lauryl sulfate

In Situ Mechanistic Study of SDS Adsorption on Hematite for Optimized Froth Flotation

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