Recycling of process water in sulphide flotation: Effect of calcium and sulphate ions on flotation of galena

Ikumapayi, Fatai; Mäkitalo, Maria; Johansson, Börje; Rao, K. Hanumantha

doi:10.1016/j.mineng.2012.07.016

Cited by 134 publications

(51 citation statements)

References 40 publications

(45 reference statements)

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“…It can be seen that the mineral grain surfaces, perovskite (Figure 14a), Titanaugite (Figure 14b), and MA-spinel ( Figure 14c) were coated by many needle particles; the EDX spectrum indicated the needle particles constituted CaSO 4 ( Figure 14d). The existing free CaO in the modified slag reacted with H 2 SO 4 and the CaSO 4 precipitate covered the minerals' surfaces during the flotation process, similar to certain research reports [29,30]. These may be the main factors resulting in the large H 2 SO 4 consumption and poor TiO 2 grade and recovery.…”

Section: Modified Slag Flotationsupporting

confidence: 80%

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 Flotationsupporting

confidence: 80%

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

et al. 2017

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“…Ce is stable in its 4 + oxidation state while Tb oxide has been reported as a mixed valence compound [12]. In addition, polymorphism has been observed for the sesquioxides and five different crystalized types (A, B, C, H, and X) were reported [1].…”

Section: Resultsmentioning

confidence: 99%

Raman and Fluorescence Spectroscopy of CeO₂, Er₂O₃, Nd₂O₃, Tm₂O₃, Yb₂O₃, La₂O₃, and Tb₄O₇

Cui

Hope

2015

Journal of Spectroscopy

114

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To better understand and ascertain the mechanisms of flotation reagent interaction with rare earth (RE) minerals, it is necessary to determine the physical and chemical properties of the constituent components. Seven rare earth oxides (CeO2, Er2O3, Nd2O3, Tm2O3, Yb2O3, La2O3, and Tb4O7) that cover the rare earth elements (REEs) from light to heavy REEs have been investigated using Raman spectroscopy. Multiple laser sources (wavelengths of 325 nm, 442 nm, 514 nm, and 632.8 nm) for the Raman shift ranges from 100 cm−1to 5000 cm−1of these excitations were used for each individual rare earth oxide. Raman shifts and fluorescence emission have been identified. Theoretical energy levels for Er, Nd, and Yb were used for the interpretation of fluorescence emission. The experimental results showed good agreement with the theoretical calculation for Er2O3and Nd2O3. Additional fluorescence emission was observed with Yb2O3that did not fit the reported energy level diagram. Tb4O7was observed undergoing laser induced changes during examination.

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“…Flotation exploits a difference in surface wettability on valuable and gangue minerals, and water quality has a significant impact on mineral flotation through the modification of surface wettability by ions in water [1][2][3][4]. Due to the scarcity of fresh water and increasingly stringent regulations on the quality of discharged water, groundwater or sea water with a high strength of ions and recycled water are used by most flotation plants.…”

Section: Introductionmentioning

confidence: 99%

The Interaction between Ca2+ and Molybdenite Edges and Its Effect on Molybdenum Flotation

Wan

Yang

Cao³

et al. 2017

Minerals

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Abstract:In this paper, the influence of Ca 2+ on the flotation of a skarn type molybdenum ore and pure molybdenite mineral at pH 8 was studied using diesel as the collector. It was found that Ca 2+ had little effect on molybdenum flotation at low concentrations. By further increasing Ca 2+ concentration, the floatability of molybdenite-especially from the fine size fractions-was depressed even without the presence of fine gangue minerals. The mechanism responsible for the deleterious effect of Ca 2+ on molybdenite flotation was studied by a range of techniques including zeta potential measurements, Scanning Electron Microscopy, and Energy Dispersive X-ray Spectrometer (SEM-EDS) analyses and molybdenum phase analyses. It was found that Ca 2+ interacted with molybdenite edges producing CaMoO 4 precipitates which were responsible for the depression of molybdenite flotation of Ca 2+ by preventing the adsorption of diesel.

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Recycling of process water in sulphide flotation: Effect of calcium and sulphate ions on flotation of galena

Cited by 134 publications

References 40 publications

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

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

Raman and Fluorescence Spectroscopy of CeO₂, Er₂O₃, Nd₂O₃, Tm₂O₃, Yb₂O₃, La₂O₃, and Tb₄O₇

The Interaction between Ca2+ and Molybdenite Edges and Its Effect on Molybdenum Flotation

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Recycling of process water in sulphide flotation: Effect of calcium and sulphate ions on flotation of galena

Cited by 134 publications

References 40 publications

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

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

Raman and Fluorescence Spectroscopy of CeO2, Er2O3, Nd2O3, Tm2O3, Yb2O3, La2O3, and Tb4O7

The Interaction between Ca2+ and Molybdenite Edges and Its Effect on Molybdenum Flotation

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Raman and Fluorescence Spectroscopy of CeO₂, Er₂O₃, Nd₂O₃, Tm₂O₃, Yb₂O₃, La₂O₃, and Tb₄O₇