Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment

Hirajima, Tsuyoshi; Mori, Masashi; Ichikawa, Osamu; Sasaki, Keiko; Miki, Hajime; Farahat, Mohsen; Sawada, Mitsuru

doi:10.1016/j.mineng.2014.07.011

Cited by 99 publications

(52 citation statements)

References 23 publications

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“…At this weak alkali pH condition, copper and iron ions precipitates since precipitation form is the stable species according to pH-Eh diagram 8,9) . These reaction can be expressed as following reaction.…”

Section: Potential Polarization Experimentsmentioning

confidence: 99%

“…Although the chalcopyrite surface is oxidized, molybdenite is only slightly in uenced by the electrolysis treatment. Furthermore, according to thermodynamic calculations 8,9) , copper and iron released from the chalcopyrite surface can be deposited as oxides or oxyhydroxides, whereas, under this condition, molybdenite-oxide species can exist stably as ions. This indicates that the chalcopyrite surface is covered by iron and/or copper oxides, whereas the molybdenite surface remains uncovered.…”

Section: Electrolysis Oxidation Treatmentmentioning

confidence: 99%

“…With prolonged retention after electrolysis oxidation, molybdenum oxide can dissolve as molybdenum oxide ions, such as MoO 4 2− , as indicated by the pHEh diagram 8,9) . As a result, the molybdenite surface becomes hydrophobic with prolonged retention.…”

Section: Xps Surface Analysis For Electrolysis Oxidation Treatmentmentioning

confidence: 99%

“…There is report about the effect of pulp potential on selective otation, it suggests that recovery of chalcopyrite and molybdenite is different with speci c pulp potential 7) . From this knowledge, authors has proposed alternative selective otation process with an oxidation pretreatment system 8,9) . The operating principle of this process is based on the difference in the oxidation tendency of chalcopyrite (CuFeS 2 ), the most important copper mineral, and molybdenite.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, with oxidation, chalcopyrite becomes more hydrophilic than molybdenite since coverage of hydrophilic sulfate/hydroxide and, hence, selective otation may be employed. Various oxidation methods, including plasma oxidation 8) and ozone oxidation 9) , have been proposed. However, the phenomena occurring during these processes and the reaction required to achieve an effective process must be elucidated.…”

Section: Introductionmentioning

confidence: 99%

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Electrolysis Oxidation of Chalcopyrite and Molybdenite for Selective Flotation

et al. 2017

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Electrolysis oxidation of chalcopyrite and molybdenite was investigated, via various electrochemical methods, with the aim of realizing selective otation of these minerals. Result of potential polarization indicated that oxidation via electrolysis affected only the chalcopyrite surface, owing mainly to the difference in conductivity of these minerals. Also measurements of contact angle after electrolysis indicated that contact angle of chalcopyrite selectively decreased whereas that of molybdenite did not decrease drastically. XPS analyses after electrolysis indicated that chalcopyrite peak decreased whereas iron oxyhydroxide (goethite) and iron sulfate increased, it suggests that these oxidation products covered on the surface of chalcopyrite. On the other hand, molybdenite peak is similar after electrolysis except for molybdenum oxide/ oxygen with molybdenite can be seen for oxygen peak. From these results and general knowledge that sul de hydrophobicity and sulfate/ oxyhydroxide hydrophilicity, it can be explained that with electrolysis oxidation, hydrophilic oxihydroxide and sulfate covered on the surface of hydrophobic chalcopyrite then chalcopyrite surface became hydrophilic. On the other hand, molybdenite surface keep hydrophobic since its dif culty of oxidation and it is dif cult to stay molybdenum oxide on the surface due to its soluble property. These results revealed that chalcopyrite was selectively oxidized and, hence, selective otation of chalcopyrite and molybdenite was possible. This electrolysis oxidation methods were compared with those governing other oxidation treatments.

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Section: Potential Polarization Experimentsmentioning

confidence: 99%

Section: Electrolysis Oxidation Treatmentmentioning

confidence: 99%

Section: Xps Surface Analysis For Electrolysis Oxidation Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrolysis Oxidation of Chalcopyrite and Molybdenite for Selective Flotation

et al. 2017

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Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

Cheng

Wang

et al. 2023

Adv Energy and Sustain Res

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TiO2–based photocatalysis system for splitting water into hydrogen offers a sustainable and green technology to produce clean hydrogen energy. However, pristine TiO2 still exists inherent shortcomings restricting its practical applications. Herein, the impact of postprocessing approaches of protonic titanate on engineering of oxygen vacancy and photocatalytic hydrogen evolution of TiO2−x is studied. Subsequently, interfacial cocatalysts are successfully involved in the optimized TiO2−x for enhanced photocatalytic hydrogen evolution. TiO2−x with the highest photocatalytic hydrogen evolution performance of 3112.09 μmol g−1 h−1, denoted as TiO2–C, is selected to adjust the interface with Cu and MoS2 respectively. Cu–TiO2–C and MoS2–TiO2–C composites are synthesized to enhance the separation ability of photogenerated electron‐hole pairs and significantly improve the photocatalytic hydrogen evolution performance. The photocatalytic hydrogen evolution rates of 5 wt% Cu–TiO2–C and 40 wt% MoS2–TiO2–C are 9225.75 and 5765.48 μmol g−1 h−1, respectively. It is proved that different postprocessing methods can tune the content of oxygen vacancy in TiO2−x and regulate the photocatalytic hydrogen evolution performance of TiO2−x materials. The interface regulation of the cocatalyst also contributes to the separation of photogenerated electron‐hole pairs and serves as active sites to enhance hydrogen evolution performance.

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S defect-rich ultrathin 2D MoS2: The role of S point-defects and S stripping-defects in the removal of Cr(VI) via synergistic adsorption and photocatalysis

Luo

Chen

Yang

et al. 2021

Applied Catalysis B: Environmental

119

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Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment

Cited by 99 publications

References 23 publications

Electrolysis Oxidation of Chalcopyrite and Molybdenite for Selective Flotation

Electrolysis Oxidation of Chalcopyrite and Molybdenite for Selective Flotation

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

S defect-rich ultrathin 2D MoS2: The role of S point-defects and S stripping-defects in the removal of Cr(VI) via synergistic adsorption and photocatalysis

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Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment

Cited by 99 publications

References 23 publications

Electrolysis Oxidation of Chalcopyrite and Molybdenite for Selective Flotation

Electrolysis Oxidation of Chalcopyrite and Molybdenite for Selective Flotation

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO2 Nanostructures

S defect-rich ultrathin 2D MoS2: The role of S point-defects and S stripping-defects in the removal of Cr(VI) via synergistic adsorption and photocatalysis

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Product

Resources

About

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures