Adsorption of oleate and octyl-hydroxamate on to rare-earths minerals

Pavez, Osvaldo; Brandão, Paulo Roberto Gomes; Peres, Antônio Eduardo Clark

doi:10.1016/0892-6875(96)00020-9

Cited by 90 publications

(21 citation statements)

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“…Among these bands, that at 1663.6 cm −1 can be attributed to the C=O stretching vibration. However, that at 1566.8 cm −1 can be attributed to the -N-H stretching vibration, and the bands at 1078.8, 1031.3, and 970.3 cm −1 can be attributed to the N-O stretching vibration [19][20][21].…”

Section: Modified Slag Flotation Experimentsmentioning

confidence: 99%

Flotation Behaviors of Perovskite, Titanaugite, and Magnesium Aluminate Spinel Using Octyl Hydroxamic Acid as the Collector

et al. 2017

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Abstract:The flotation behaviors of perovskite, titanaugite, and magnesium aluminate spinel (MA-spinel), using octyl hydroxamic acid (OHA) as the collector, were investigated using microflotation experiments, zeta-potential measurements, Fourier transform infrared (FT-IR) analyses, X-ray photoelectron spectroscopy (XPS) analyses, and flotation experiments on artificially mixed minerals. The microflotation experiments show that the floatability of perovskite is clearly better than titanaugite and MA-spinel at around pH 5.5, while titanaugite possesses certain floatability at pH 6.0-6.5, and MA-spinel displays good floatability at pH > 8.0. The results of the FT-IR and XPS analyses show that OHA mainly interacts with Ti, resulting in perovskite flotation, and that the Al on titanaugite, as well as the Mg and Al on the MA-spinel surface, chemically react with OHA under acidic conditions. However, OHA mainly reacts with the Ti and Ca on the perovskite surface, Ca and Mg on the titanaugite surface, and Mg and Al on the MA-spinel surface under alkaline conditions. The results of the artificially mixed mineral flotation experiment show that the concentrate of TiO 2 grade increased from 19.73% to 30.18% at pH 5.4, which indicates that a weakly acidic solution is the appropriate condition for the flotation separation of perovskite from titanaugite and MA-spinel. The results of the modified slag flotation experiments show that the TiO 2 grade of concentrate increased from 18.13% to 23.88% at pH 5.4, through the open circuit test of "one roughing and one cleaning". OHA displays selectivity toward perovskite in the modified slag flotation, but the consumption of H 2 SO 4 is very high. The CaSO 4 precipitate covered on the mineral surfaces results in poor TiO 2 grade and recovery.

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Section: Modified Slag Flotation Experimentsmentioning

confidence: 99%

Flotation Behaviors of Perovskite, Titanaugite, and Magnesium Aluminate Spinel Using Octyl Hydroxamic Acid as the Collector

et al. 2017

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“…Currently, hydroxamic acids and their salts have been extensively studied and used in flotation due to their strong and selective chelation with some metal ions (Natarajan and Fuerstenau, 1983;Buckley and Parker, 2013;Fuerstenau et al, 2000). Previous reviews indicated that adsorption of hydroxamic acids on mineral surface involved either transition metal or rare-earth metal ions in the crystal lattices (Pavez et al, 1996;Fuerstenau and Pradip, 1984;Pradip, 1987), such as cassiterite and rare-earths minerals. Hydroxamate collectors could effectively increase wolframite's floatability as a result of the formation of ferrous/manganous hydroxamate precipitations (Hu et al, 1997;Bogdanov et al, 1973;Yang et al, 2014).…”

Section: Introductionmentioning

confidence: 97%

Studies on interaction mechanism of fine wolframite with octyl hydroxamic acid

Meng

Feng

Shi

et al. 2015

Minerals Engineering

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“…A wide range of values for the point of zero charge (PZC) of monazite have been reported as a consequence of varying chemical composition and crystal structure with different geological origin, presence or absence of impurities and distinct experimental conditions (Chelgani et al, 2015). However, the average PZC of monazite in the absence of collector is around pH 5 (Cheng et al, 1993;Pavez et al, 1996). For more information about monazite flotation, the interested reader is directed to recent review articles (Chelgani et al, 2015;Kumari et al, 2015).…”

Section: Introductionmentioning

confidence: 97%