Possibilities of collectorless flotation in the treatment of pentlandite ores

Heiskanen, Kari; Kirjavainen, Vesa; Laapas, H.

doi:10.1016/0301-7516(91)90057-p

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…At higher pH values iron hydroxides and probably sulphates tend to precipitate or form "in situ" on the surfaces hindering both oxidation and making surfaces more hydrophilic. This indicates that the oxidation of pyrrhotite and chalcopyrite progressed more rapidly than that of pentlandite [47]. In the absence of collector, sulphur dioxide depresses not only pyrrhotite but also pentlandite by destroying their sulphur-rich hydrophobic surface layers and forming sulphoxy species [60].…”

Section: Collectorless Flotation Of Pentlanditementioning

confidence: 97%

Chemical and colloidal aspects of collectorless flotation behavior of sulfide and non-sulfide minerals

Aghazadeh

Mousavinezhad

Gharabaghi

2015

Advances in Colloid and Interface Science

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Section: Collectorless Flotation Of Pentlanditementioning

confidence: 97%

Chemical and colloidal aspects of collectorless flotation behavior of sulfide and non-sulfide minerals

Aghazadeh

Mousavinezhad

Gharabaghi

2015

Advances in Colloid and Interface Science

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“…We computed the band structures for the relaxed most stable surfaces before and after reconstruction, and those of nondipole surfaces, as shown in Section SI4 in the Supporting Information, to obtain their band gap that can be related to their chemical reactivity stability, as depicted in Table . The band gap is related to the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) gap of molecules, where it has been reported that the molecule with the lowest HOMO–LUMO gap has higher reactivity, while the molecule with the highest HOMO–LUMO gap is less reactive. , We used this theory to describe the surface chemical reactivity stability using the band gaps, where a higher band gap depicts less reactivity and thus a more chemical stable surface. It is paramount to remember that a stable surface has the lowest surface energy, which implies a less reactive surface.…”

Section: Discussionmentioning

confidence: 99%

“…The band gap is related to the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) gap of molecules, where it has been reported that the molecule with the lowest HOMO–LUMO gap has higher reactivity, while the molecule with the highest HOMO–LUMO gap is less reactive. 61 , 62 We used this theory to describe the surface chemical reactivity stability using the band gaps, where a higher band gap depicts less reactivity and thus a more chemical stable surface. It is paramount to remember that a stable surface has the lowest surface energy, which implies a less reactive surface.…”

Section: Discussionmentioning

confidence: 99%

Reconstruction of Cooperite (PtS) Surfaces: A DFT-D+U Study

Mkhonto

Ngoepe

2022

ACS Omega

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Cooperite (PtS) is one of the main sources of platinum in the world and has not been given much attention, in particular from the computational aspect. Besides, the surface stability of cooperite is not fully understood, in particular the preferred surface cleavage. In the current study, we employed computer modeling methods within the plane-wave framework of density functional theory with dispersion correction and the U parameter to correctly predict the bulk and surface properties. We reconstructed and calculated the geometries and surface energies of (001), (100), (101), (112), (110), (111), and (211) cooperite surfaces of stoichiometric planes. The Pt d-orbitals with U = 4.5 eV and S p-orbitals with U = 5.5 eV were found optimum to correctly predict a band gap of 1.408 eV for the bulk cooperite model, which agreed with an experimental value of 1.41 eV. The PtS-, Pt-, and S-terminated surfaces were investigated. The structural and electronic properties of the reconstructed surfaces were discussed in detail. We observed one major mechanism of relaxation of cooperite surface reconstructions that emerged from this study, which was the formation of Pt–Pt bonds. It emanated that the (110) and (111) cooperite surfaces underwent significant reconstruction in which the Pt2+ cation relaxed into the surface, forming new Pt–Pt (Pt2 2+) bonds. Similar behavior was perceived for (101) and (211) surfaces, where the Pt2+ cation relaxed inward and sideways on the surface, forming new Pt–Pt (Pt2 2+) bonds. The surface stability decreased in the order (101) > (100) ≈ (112) > (211) > (111) > (110) > (001), indicating that the (101) surface was the most stable, leading to an octahedron cooperite crystal morphology with truncated corners under equilibrium conditions. However, the electronic structures indicated that the chemical reactivity stability of the surfaces would be determined by band gaps. It was found that the (112) surface had a larger band gap than the other surfaces and thus was a chemical stability competitor to the (101) surface. In addition, it was established that the surfaces had different reactivities, which largely depended on the atomic coordination and charge state based on population atomic charges. This study has shown that cooperite has many planes/surface cleavages as determined by the computed crystal morphology, which is in agreement with experimental X-ray diffraction (XRD) pattern findings and the formation of irregular morphology shapes.

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“…( [37][38][39][40][41]), Figure S1: Photo of Mozley C125 two-inch (5.1 cm) stub hydrocyclone mounted in a standard Mozley test rig; Figure S2…”

Section: Supplementary Materialsmentioning

confidence: 99%

Awaruite, a New Large Nickel Resource: Flotation under Weakly Acidic Conditions

Seiler,

Sánchez,

Pawlik

et al. 2023

Minerals

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To support the transformation to clean low carbon technologies, there is a demand for critical metals such as nickel. Awaruite is a less common nickel-bearing mineral with unique properties and responses to mineral separation. This paper presents the findings of a flotation study to recover awaruite from the Baptiste ultramafic deposit, located in central British Columbia, Canada. Nickel recoveries of up to 65% at the rougher stage were obtained with xanthate as a collector at a pH level of 4.5. Awaruite flotation was shown to be highly dependent on the slurry pH. At weakly acidic conditions, the awaruite surface is activated through the dissolution of the passivation layer formed during grinding in alkaline conditions. Desliming was shown to reduce the acid consumption required to maintain the pH, probably by removing the highly reactive serpentine slimes generated during grinding. Rougher, followed by cleaner stages of flotation, showed that a high-grade concentrate can be produced with up to 45% nickel, 1.3% cobalt, 0.7% copper and negligible concentrations of penalty elements, such as arsenic, lead, and selenium, among others. A nickel flotation concentrate from an awaruite deposit is a promising feedstock for not only stainless-steel production but also for clean energy technologies.

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Possibilities of collectorless flotation in the treatment of pentlandite ores

Cited by 15 publications

References 5 publications

Chemical and colloidal aspects of collectorless flotation behavior of sulfide and non-sulfide minerals

Chemical and colloidal aspects of collectorless flotation behavior of sulfide and non-sulfide minerals

Reconstruction of Cooperite (PtS) Surfaces: A DFT-D+U Study

Awaruite, a New Large Nickel Resource: Flotation under Weakly Acidic Conditions

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