Surface characterization of molybdenite, bismuthinite, and pyrite to identify the influence of pH on the mineral floatability

Lin, Shangyong; Wang, Chengwen; Sun, Wei; Jing, Gaogui

doi:10.1016/j.apsusc.2021.151756

Cited by 20 publications

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“…Lime cannot exist stably in aqueous solution; in fact, it will hydrolyze, producing a range of Ca species [such as Ca 2+ , Ca(OH) + , and Ca(OH) 2 ] and OH – . These hydrolyzed species will be adsorbed and deposited on the surface of pyrite, forming hydrophilic Fe(OH) 2 , Fe(OH) 3 , CaSO 4 , and Ca(OH) 2 precipitates. , The possible process is that numerous hydroxyls in the alkaline pulp gather on the surface Fe cations of pyrite to form Fe–OH structures, − which causes the pyrite surface to be negatively charged. ,− This facilitates the positively charged calcium species to act on the pyrite surface by electrostatic attraction, thereby reducing the number of target sites on the pyrite surface for xanthate adsorption. Here, hydroxyl (OH – ), the main component produced by the dissolution of lime in water, provides the alkaline pulp environment, while Ca 2+ is present as Ca(OH) + species at alkaline pH below 12.5 …”

Section: Introductionmentioning

confidence: 99%

Progressive Hydrophilic Processes of the Pyrite Surface in High-Alkaline Lime Systems

et al. 2023

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Pyrite, as a disturbing gangue mineral in the beneficiation of valuable sulfide minerals and coal resources, is usually required to be depressed for floating in flotation practice. Specifically, the depression of pyrite is achieved by causing its surface to be hydrophilic with the assistance of depressants, normally with inexpensive lime used. Accordingly, the progressive hydrophilic processes of the pyrite surface in high-alkaline lime systems were studied in detail using density functional theory (DFT) calculations in this work. The calculation results suggested that the pyrite surface is prone to hydroxylation in the high-alkaline lime system, and the hydroxylation behavior of the pyrite surface is beneficial to the adsorption of monohydroxy calcium species in thermodynamics. Adsorbed monohydroxy calcium on the hydroxylated pyrite surface can further adsorb water molecules. Meanwhile, the adsorbed water molecules form a complex hydrogen-bonding network structure with each other and with the hydroxylated pyrite surface, which makes the pyrite surface further hydrophilic. Eventually, with the adsorption of water molecules, the adsorbed calcium (Ca) cation on the hydroxylated pyrite surface will complete its coordination shell surrounded by six ligand oxygens, which leads to the formation of a hydrophilic hydrated calcium film on the pyrite surface, thus achieving the hydrophilization of pyrite.

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Section: Introductionmentioning

confidence: 99%

Progressive Hydrophilic Processes of the Pyrite Surface in High-Alkaline Lime Systems

et al. 2023

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“…몰리브덴 을 함유하는 주요 광물은 휘수연석(Molybdenite, MoS 다 18,19) . 몰리브덴의 부유성은 광물학적 특성, 슬라임 코 팅, 분쇄 및 단체분리 및 부선시약 등과 같은 요소들에 영 향을 받으며, 이러한 요소들은 부유선별의 최종산물인 정 광의 품위 및 회수율에 영향을 미치게 된다 [20][21][22] . (2) 몰리브덴 원광, 휘수연석 및 맥석광물에 대한 제타전 위를 측정한 결과, 대분분의 구성광물 모두 전체 pH…”

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Mineralogical Characteristics and Fundamental Study of Flotation for Molybdenum Ore

Purev

Kim²,

Park³

2022

Resour. Recycl.

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This study investigated the mineralogical characteristics and basic flotation properties of domestic molybdenum ores. The source mineral of molybdenum was identified as molybdenite, and the main gangue minerals in the raw ore were silicate minerals. Copper, lead, and zinc were also found in trace amounts. Based on the results of basic flotation properties, molybdenite's zeta potential showed negative charges in all pH ranges. The contact angle of molybdenite increased with pH, reaching a maximum of 74° at pH 9. In optimal conditions, the grade and recovery of the concentrate by unit flotation were MoS 2 82.4% and 92.04%, respectively. Further investigation of the impurities in the concentrate revealed a sulfide mineral with surface characteristics similar to molybdenite and silicate minerals combined with molybdenite, which may degrade the quality of the concentrate. To improve the concentrate quality, we intend to control silicate minerals through regrinding and liberation and use column flotation to improve fine particle separation efficiency.

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Selective Adsorption Mechanism of Ferric Ions on the Surfaces of Chalcopyrite and Pyrite in Flotation

Zhang,

Zhang

et al. 2023

JOM

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Surface characterization of molybdenite, bismuthinite, and pyrite to identify the influence of pH on the mineral floatability

Cited by 20 publications

References 54 publications

Progressive Hydrophilic Processes of the Pyrite Surface in High-Alkaline Lime Systems

Progressive Hydrophilic Processes of the Pyrite Surface in High-Alkaline Lime Systems

Mineralogical Characteristics and Fundamental Study of Flotation for Molybdenum Ore

Selective Adsorption Mechanism of Ferric Ions on the Surfaces of Chalcopyrite and Pyrite in Flotation

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