A novel collector 2-ethyl-2-hexenoic hydroxamic acid: Flotation performance and adsorption mechanism to ilmenite

Xu, Haifeng; Zhong, Hong; Tang, Qing; Wang, Shuai; Gang, Zhao; Liu, Guangyi

doi:10.1016/j.apsusc.2015.06.072

Cited by 62 publications

(13 citation statements)

References 40 publications

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“…According to [1], hydroxamic acid (HA), represented by the general formula, R-CO-NHOH, is a compound derived from oxoacid by replacing the –OH in it by –NHOH, and its hydrocarbyl derivatives. The HAs are much weaker acids as compared with the corresponding carboxylic acids despite having identical carbon chains, however, they possess stronger abilities for selectively chelating metal ions [2]. As a metal binding group, HA are also widely used as a metalloenzyme inhibitor, including tyrosinase inhibitors [3], histone deacetylase inhibitors [4,5,6,7], and HIV-integrase inhibitors [8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of N-Methyl Fatty Hydroxamic Acids from Ketapang Seed Oil Catalyzed by Lipase

Suhendra¹,

Gunawan²,

Hajidi³

2019

Molecules

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N-methyl fatty hydroxamic acid (N-MFHA), which is a derivative of hydroxamic acid (HA), was synthesized from ketapang seed oil (Terminalia catappa L.). In general, HAs have wide applications due to their chelating properties and biological activities. N-MFHAs were synthesized using immobilized lipase (Lipozyme TL IM) in biphasic medium which was the ketapang seed oil dissolved in hexane and N-methylhydroxylamine dissolved in water. The products were characterized through color testing and FT-IR spectroscopy after purification. Various factors affecting the enzyme activity investigated in the study included the effect of incubation time, the amount of lipase used, and the temperature. On the basis of the results, the optimum conditions for the synthesis of N-MFHA obtained are 25 h of incubation time, a temperature of 40 °C, and a ratio of 1:100 for the amount of enzyme (g)/oil (g). At the optimum conditions of the reaction, 59.7% of the oils were converted to N-MFHA.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of N-Methyl Fatty Hydroxamic Acids from Ketapang Seed Oil Catalyzed by Lipase

Suhendra¹,

Gunawan²,

Hajidi³

2019

Molecules

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“…There is a significant decrease in the recovery of pyrrhotite using sodium butyl xanthate (SBX) as a collector when ET = 24 h [19,23]. Hydroxamic acids, R-CO-NHOH (R, alkyl/aryl group), are much weaker acids than the corresponding carboxylic acids, in the identical carbon chain, but possess stronger abilities in selectively chelating metal ions [24]. Hydroxamic acids can chelate with metal cations (e.g., Cu 2+ , Fe 3+ , Al 3+ ) to form hydrophobic metal chelates [24,25], and the chelation reaction for hydroximic acids to metal cation can form an "O, N" four-ring chelate and/or an "O, O" five-ring chelate (the chelate products are shown in Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…Hydroxamic acids, R-CO-NHOH (R, alkyl/aryl group), are much weaker acids than the corresponding carboxylic acids, in the identical carbon chain, but possess stronger abilities in selectively chelating metal ions [24]. Hydroxamic acids can chelate with metal cations (e.g., Cu 2+ , Fe 3+ , Al 3+ ) to form hydrophobic metal chelates [24,25], and the chelation reaction for hydroximic acids to metal cation can form an "O, N" four-ring chelate and/or an "O, O" five-ring chelate (the chelate products are shown in Figure 1). Since the tension of the four-ring chelate is relatively high, and the stability is poor, the chelate product is mainly a five-ring chelate.…”

Section: Introductionmentioning

confidence: 99%

Separation of Oxidized Pyrrhotite from Fine Fraction Serpentine

Zhou

Mao

2018

Minerals

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The valuable minerals in copper-nickel sulfide ore can easily be oxidized, leading to the reduction of their flotation recovery and a difficulty in separating them from gangue. In order to solve the problem, the reaction mechanism of the octanohydroxamic acid (OHA) on oxidized pyrrhotite was revealed through micro-flotation, adsorption tests, zeta potential measurements, and X-ray photoelectron spectroscopy (XPS) analysis. The results show that this is a feasible way to find a suitable collector that can directly react to oxidation products on the surface of pyrrhotite. OHA can efficiently reclaim oxidized pyrrhotite and achieve the selective separation of a pyrrhotite-serpentine mixture in a weak alkaline environment. The adsorption tests, zeta potential measurements, and XPS analyses show that OHA can interact with an oxidized pyrrhotite surface, and the interaction between OHA and serpentine is very weak. The XPS analyses indicate that the OHA collector can chelate with Fe(OH)3 on the surface of oxidized pyrrhotite and form an “O, O” five-ring chelate. At the same time, the OHA collector may compete with the hydroxyl groups of hydrophilic substances on the mineral surface to produce hydrophobic products and reduce the hydrophilic substances on the mineral surface.

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“…Currently, most REEs are extracted from bastnaesite ((Ce,La)CO 3 F) (Chelgani et al, 2015;Yosry, 1990), which is recovered from rare earth ores by flotation. Typically, hydroxamic acids are used as bastnaesite collectors (Xu, 2015;Ren, 1997;Mousumi and Venugopal, 2016). Research into the mechanism of interaction between hydroxamic acids and bastnaesite is important for improving the recoveries of bastnaesite.…”

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confidence: 99%

Synthesis of 3-hydroxy-2-naphthyl hydroxamic acid collector: flotation performance and adsorption mechanism on bastnaesite

Yang

Bian

2017

J. South. Afr. Inst. Min. Metall.

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A novel collector 2-ethyl-2-hexenoic hydroxamic acid: Flotation performance and adsorption mechanism to ilmenite

Cited by 62 publications

References 40 publications

Synthesis and Characterization of N-Methyl Fatty Hydroxamic Acids from Ketapang Seed Oil Catalyzed by Lipase

Synthesis and Characterization of N-Methyl Fatty Hydroxamic Acids from Ketapang Seed Oil Catalyzed by Lipase

Separation of Oxidized Pyrrhotite from Fine Fraction Serpentine

Synthesis of 3-hydroxy-2-naphthyl hydroxamic acid collector: flotation performance and adsorption mechanism on bastnaesite

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