In Ephemerida J. Kepleri

Vaughan, Thomas L.; Rudrum, Alan

doi:10.1093/oseo/instance.00008342

Cited by 2 publications

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“…Under mildly oxidizing conditions, both pentlandite and pyrrhotite display floatability in the absence of col-lector~.~ The potential at which self-induced flotation occurs (50% recovery in the first minute) was found4 to correspond to E , values of -0. 15 and 0.0 V for pentlandite and pyrrhotite, respectively. X-ray photoelectron spectroscopy (XPS) and electrochemical investigations on a range of sulphide minerals have led to the conclusion that self-induced floatability results from the development of a metal deficiency in the sulphide surface.'…”

Section: Introductionmentioning

confidence: 98%

Surface composition of pentlandite under flotation‐related conditions

Buckley¹,

Woods²

1991

Surface & Interface Analysis

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X-ray photoelectron spectroscopy (XPS) and electrochemical techniques have been applied to the investigation of the surface oxidation of pentlandite. Photoelectron spectra indicate that the initial reaction on exposure to air is removal of iron from the pentlandite lattice to form a hydrated iron oxide overlayer and leave a metal-deficient pentlandite in addition to a restructured nickel-iron sulphide. Further oxidation resulted in some nickel being traasferred to the oxide. In dilute acetic acid, the oxide layer was largely soluble. In basic media, the products were the same as in air but the reaction rate was greater. The voltammetric characteristics of pentlandite in solutions of pH 4.6, 9.2 and 13 were consistent with the XPS findings. Pentlandite behaved in a manner similar to that established previously for pyrrhotite, indicating that the iron in pentlandite is preferentially removed on anodic oxidation to leave a metaldeficient sulphide layer. There was evidence for the additional removal of nickel from the sulphide lattice. The formation of sulphate was also indicated on scans to high potentials in basic media.

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Section: Introductionmentioning

confidence: 98%

Surface composition of pentlandite under flotation‐related conditions

Buckley¹,

Woods²

1991

Surface & Interface Analysis

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“…From the IS of 0.635 mm SS', we deduce iron in the Fe" high-spin state. The reduction of the IS compared with that of FeS [33] may be indicative of higher covalency in TI,,,,V,FeS,. From short metal-metal distances parallel to the crystallographic c-axis strong interactions are expected.…”

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confidence: 98%

An Fe⁵⁷Mössbauer Study of Selected Binary and Ternary Vanadium Sulfides

Bensch

Schlögl

Amberger³

1986

Helvetica Chimica Acta

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Mössbauer data recorded at room temperature and 78 K for several binary and two new ternary vanadium sulfides are presented. The results are discussed in comparison with the structures and magnetic susceptibility measurements. A change in the spin state of the Fe‐atoms from the Fe2+ high‐spin state to the low‐spin state is observed in the binary vanadium sulfides. This change is due to a shortening of the crystallographic c‐axis which is nearly parallel to short metal‐metal distances. In one ternary thallium vanadium sulfide the Fe is in the unusual trivalent low‐spin state at room temperature.

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In Ephemerida J. Kepleri

Cited by 2 publications

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Surface composition of pentlandite under flotation‐related conditions

Surface composition of pentlandite under flotation‐related conditions

An Fe⁵⁷Mössbauer Study of Selected Binary and Ternary Vanadium Sulfides

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In Ephemerida J. Kepleri

Cited by 2 publications

References 0 publications

Surface composition of pentlandite under flotation‐related conditions

Surface composition of pentlandite under flotation‐related conditions

An Fe57Mössbauer Study of Selected Binary and Ternary Vanadium Sulfides

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An Fe⁵⁷Mössbauer Study of Selected Binary and Ternary Vanadium Sulfides