Adsorption thermodynamics and kinetics of N , N ′-diisopropoxypropyl- N ″, N ‴-oxydiethylenedicarbonyl bis (thiourea) on chalcopyrite surfaces

Xiao, Jingjing; Ren, Heng; Zhong, Hong

doi:10.1016/j.jiec.2014.06.003

Cited by 33 publications

(3 citation statements)

References 30 publications

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“…The value of n = 1 indicates that the equilibrium distribution between the solid and liquid phase is independent of the concentration, whereas the values of 1/n > 1 or 1/n < 1 show cooperative and normal adsorption, respectively (Nure et al 2017). Moreover, the degree of the surface heterogeneity increases sharply as the value of 1/n decreases (Liu et al 2015). Specifically, the Freundlich intensity (n) value indicated that the adsorption process was a cooperative, which was reported in several recently published journal articles (Nure et al 2017).…”

Section: Freundlich Isothermmentioning

confidence: 99%

Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Fito

Said²,

Feleke³

et al. 2019

Environ Syst Res

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Background: Nowadays freshwater quality deterioration and quantity depletion are rapidly increasing across the globe. Especially fluoride polluted groundwater is causing a severe shortage of water supply and public health problem. Hence, this study was designed to investigate the performance of activated carbon produced from the Catha edulis stem for the removal of fluoride from aqueous solution. A C. edulis stem sample was collected from dumping sites of Addis Ababa City and its activation and carbonation processes were performed using H 2 SO 4 and a high temperature of 600 °C. The experimental study was designed to use a full factorial approach with a 3 3 which were the three factors with the three levels, namely pH (2, 7 and 9), contact times (60, 90 and 120 min) and adsorbent doses (0.5 g, 1.0 g and 1.5 g in 100 mL) at the initial fluoride concentration 30 mg/L which resulted in 81 experimental runs in triplicates. Results: The calculated maximum adsorption capacity of 18 mg/g was found under the Langmuir isotherm, whereas the Freundlich model (R 2 0.98) better fitted the experimental data, which indicated that the adsorption process was multilayer and cooperative. The maximum fluoride removal of 73% was observed at the optimum condition of adsorbent dose of 1.5 g in 100 mL contact time of 60 min and pH 2, whereas the predicted value of the fluoride removal of 69% was calculated under the same experimental condition. Fluoride removal was positive and strongly influenced by the adsorbent dose, whereas the adsorption pH was negatively and weakly impacted on removal. Conclusions: Generally, the performance of activated carbon for the removal of fluoride from aqueous solution is promising. The study also indicated that C. edulis activated carbon is a potential candidate for water treatment technology.

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Section: Freundlich Isothermmentioning

confidence: 99%

Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Fito

Said²,

Feleke³

et al. 2019

Environ Syst Res

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“…More recently, both experimental and theoretical studies on modified thionocarbamates and thioureas have been carried out. These structural modifications provided additional active points or incorporated functional groups on the N donor atom, resulting in xanthate-related compounds that exhibit a high affinity for float copper minerals but also exhibit a high selectivity against the recovery of pyrite. ,− Our efforts, reported by Liu et al, involved the introduction of a novel collector; the adsorption thermodynamics and kinetics of this novel collector, N , N ′-diisopropoxypropyl-N′′,N‴-oxydiethylenedicarbonyl bis(thiourea), were investigated. He et al synthesized the novel surfactant N , N -diethyl- N ′-cyclohexylthiourea.…”

Section: Introductionmentioning

confidence: 99%

Structural Modification of Xanthate Collectors To Enhance the Flotation Selectivity of Chalcopyrite

Xia

Wang

et al. 2017

Ind. Eng. Chem. Res.

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A modified xanthate compound similar to xanthogen formates, S-benzoyl O-isobutyl xanthate (BIBX), was designed by introducing a carbonyl and a benzyl group into the xanthate structure. The preparation, recovery performance, and mechanism of adsorption of this compound to chalcopyrite is discussed. BIBX was synthesized using a one-pot approach with superior efficiency, which has important commercial implications. BIBX’s performance in the recovery of and mechanism of adsorption to chalcopyrite was investigated via flotation tests, adsorption quantity measurements, FTIR spectroscopy, X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. The results show that BIBX displays a substantially stronger collecting ability toward chalcopyrite than sodium isobutyl xanthate and O-isopropyl-N-ethylthionocarbamate. Moreover, BIBX displays superior selectivity for chalcopyrite compared to pyrite. The adsorption data indicate that BIBX can be applied under slightly acidic or alkaline conditions. BIBX behaves like a bidentate ligand, bonding with the chalcopyrite copper through the thiol sulfur and carbonyl oxygen atoms. These findings are supported by FTIR and XPS data. DFT calculations predict two distinct adsorption geometries, one with one Cu atom to form a six-membered ring complex and another with two Cu atoms to form an “irregular pentagon”-shaped complex.

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“…chalcocite and covellite) [8]. Chalcopyrite is one of the most important sulphide minerals, which is the main source of copper [9]. The presence of gangue sulphide minerals such as pyrite and non-sulphide minerals reduce the quality of concentrates [10].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Flotation in Copper Extraction From Polymetallic Ore

Vrlíková¹,

Čablík²,

Janáková³

2020

GSE

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The aim of this study was to examine flotation of utility metals from poor polymetallic ores and verify the potential for profitable yields in connection with potentially economic deposits of non-ferrous metals. The paper describes results in flotation concentrate research to recover copper from polymetallic ore. The polymetallic ore from Zlate Hory deposit (Czech Republic) was subjected to crushing, grinding, and screening to prepare feed for separation with mesh size under 200 microns. The heavy medium separation was performed in tetrabromethane with a density of 2.967 g.cm -3 . The float and sink products were obtained and tested for chemical composition. Next, the treated polymetallic ore sample was subjected to flotation. In flotation, various dosages of collector (PAX) and various pH were tested, at which pyrite was depressed. The recovery of metallic copper in the concentrate increased with the collector dose. As the pH of the medium increased, the pyrite content in the concentrate dropped. The lowest content of pyrite, i.e. 4.01 %, was obtained at pH 10. In the original polymetallic ore, the Cu content was 0.41 % after subsequent treatment and flotation tests, the Cu content increased to 1.38 % with Cu recovery 86.18 %. Figure 4. Results of pyrite depression CONCLUSIONA sample of polymetallic ores from the Zlate Hory-East deposit was subjected to flotation. The sample was adjusted to a suitable grain size and subjected to X-ray and XRF analysis. On the basis of the obtained results, the separation of quartz in heavy medium separation and subsequent flotation was performed. First, the effect various dosages of collector on the flotation efficiency was observed. The second series of flotation was used to determine pH at which to achieve maximum depressing of pyrite. With increasing the dose of PAX collector, Cu recovery in individual concentrates increased. As a result, it turned out that the dose of 84 g/t PAX was the best dose for next flotation. As the pH of the medium increased, the pyrite content of the concentrate was reduced. The content pyrite in concentrate was 4.01 % for pH 10. Concurrently with increased pH, flotation efficiency increased. In the original polymetallic ore, the Cu content was 0.41 % after subsequent treatment and flotation tests, the Cu content was increased to 1.38 % with Cu recovery 86.18 %.

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Adsorption thermodynamics and kinetics of N , N ′-diisopropoxypropyl- N ″, N ‴-oxydiethylenedicarbonyl bis (thiourea) on chalcopyrite surfaces

Cited by 33 publications

References 30 publications

Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

Structural Modification of Xanthate Collectors To Enhance the Flotation Selectivity of Chalcopyrite

Utilization of Flotation in Copper Extraction From Polymetallic Ore

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