Selective separation of chalcopyrite from pyrite using an acetylacetone-based lime-free process

Wu, Shengying; Wang, Jianjun; Tao, Liming; Fan, Ruihua; Sun, Wei; Gao, Zhiyong

doi:10.1016/j.mineng.2022.107584

Cited by 18 publications

(7 citation statements)

References 84 publications

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“…Additionally, the isoelectric point was located at pH = 3.1 which was along with the published papers. 30 , 31 After the addition of TA, the zeta potential of chalcopyrite shifted negatively, suggesting the adsorption of TA ions. 32 However, the negative shift was minor (less than 4 mV), implying that TA was weakly adsorbed on chalcopyrite.…”

Section: Resultsmentioning

confidence: 99%

Utilization and Mechanisms of Tannic Acid as a Depressant for Chalcopyrite and Pyrite Separation

Sun

Zhang

et al. 2023

ACS Omega

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Current flotation practices using lime or cyanide as depressants in chalcopyrite and pyrite separation have significant disadvantages, such as substantial reagent consumption, high slurry pH, and environmental hazards. This work aimed to explore the utilization and mechanisms of tannic acid (TA) as an eco-friendly alternative to lime or cyanide in chalcopyrite–pyrite separation. Flotation results showed that TA selectively depressed pyrite yet allowed chalcopyrite to float at neutral or alkaline pH. Adsorption density and zeta potential results indicated that TA adsorbed intensely on pyrite but minorly on chalcopyrite. Besides, potassium ethyl xanthate was still largely adsorbed on chalcopyrite but not on pyrite after TA adsorption. Surface analysis by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy further showed that the oxidation species of FeOOH and Fe2 (SO4)3, particularly FeOOH were the main active sites for TA chemical adsorption. Owing to the greater and faster oxidation of pyrite, more FeOOH and Fe2 (SO4)3 were generated on the pyrite surface, and the chemical adsorption of TA was more pronounced on the pyrite surface than on the chalcopyrite surface.

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Section: Resultsmentioning

confidence: 99%

Utilization and Mechanisms of Tannic Acid as a Depressant for Chalcopyrite and Pyrite Separation

Sun

Zhang

et al. 2023

ACS Omega

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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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“…Large amounts of lime used as a depressant are consumed to obtain a pH of 12.0. At that high pH, pyrite is strongly depressed, while chalcopyrite retains excellent floatability . However, the massive consumption of lime results in the blockage of pipelines and sticky foam, which increases the gangue entrainment in concentrates and therefore decreases the flotation separation performance. , Although cyanide depressants can avoid the problems induced by lime, their high toxicity and hazard to not only the environment but also humans restrict their wide applications. , Therefore, alternative depressants that not only are environmentally friendly but also have high separation performance should be researched.…”

Section: Introductionmentioning

confidence: 99%

“…At that high pH, pyrite is strongly depressed, while chalcopyrite retains excellent floatability. 10 However, the massive consumption of lime results in the blockage of pipelines and sticky foam, which increases the gangue entrainment in concentrates and therefore decreases the flotation separation performance. 11 , 12 Although cyanide depressants can avoid the problems induced by lime, 13 their high toxicity and hazard to not only the environment but also humans restrict their wide applications.…”

Section: Introductionmentioning

confidence: 99%

Selective Separation of Chalcopyrite from Pyrite Using Sodium Humate: Flotation Behavior and Adsorption Mechanism

Sun,

Li,

et al. 2023

ACS Omega

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Flotation separation of chalcopyrite from pyrite using lime or cyanides as depressants results in serious problems, such as the blockage of pipelines and environmental pollution. Eco-friendly organics are a future trend for beneficiation plants. In this research, the eco-friendly organic depressant sodium humate (SH) was chosen as a depressant to separate chalcopyrite from pyrite by flotation. The results indicated that SH could selectively depress pyrite owing to the oxidation species (FeOOH, Fe2(SO4)3) on its surface. The oxidation species were the adsorption sites for the COO– in the SH structure and impeded the subsequent collector potassium ethyl xanthate (KEX) adsorption. However, chalcopyrite was slightly oxidized with fewer oxidation species for SH adsorption, and KEX could be adsorbed and functioned effectively. This research suggested that SH could be an effective and eco-friendly depressant in chalcopyrite–pyrite flotation separation, which had potential use in the industry.

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Selective separation of chalcopyrite from pyrite using an acetylacetone-based lime-free process

Cited by 18 publications

References 84 publications

Utilization and Mechanisms of Tannic Acid as a Depressant for Chalcopyrite and Pyrite Separation

Utilization and Mechanisms of Tannic Acid as a Depressant for Chalcopyrite and Pyrite Separation

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

Selective Separation of Chalcopyrite from Pyrite Using Sodium Humate: Flotation Behavior and Adsorption Mechanism

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