The solvent extraction separation of molybdenum and copper from acid leach residual solution of Chilean molybdenite concentrate

Valenzuela, Fernando; Andrade, J.P.; Sapag, Jaime; Tapia, C.; Basualto, Carlos

doi:10.1016/0892-6875(95)00051-q

Cited by 64 publications

(35 citation statements)

References 11 publications

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“…However, even in the acidic pH zone, if halide ion concentration is high, most of the metal appears forming the complex species CdCl 4 2-, making compulsory under these conditions the use of basic substances as amine-extractants which act by ion-pair formation, whereby a large and positively charged organic species produces the extraction of a large anionic metal complex to the organic phase.…”

Section: Extraction Equilibriummentioning

confidence: 99%

“…Yet it presents many difficulties, such as the requirement of a huge inventory of expensive extractant, large plant size to obtain the desired separation, operational difficulties like solvent loss due to crud formation or the entrainment of the organic phase into the aqueous solution, or by volatilization of diluent and degradation of the organic extractants. 4 Membrane-based solvent extraction processes have been shown to be an effective alternative to the metal removal techniques mentioned above, including solid-supported liquid membranes [5][6][7][8] and surfactant liquid membranes. 9,10 Particularly, a surfactant liquid membrane process has sufficient ability to selectively separate metals from aqueous solutions using a double W/O/W emulsion stabilized by the use of suitable surfactants, with a reduced amount of organic solvent and greater extraction.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

Basualto¹,

Poblete²,

Marchese³

et al. 2006

J. Braz. Chem. Soc.

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Foi estudada a extração de íons cádmio(II) a partir de soluções aquosas ácidas, usando, em uma cela de transferência sob agitação, uma membrana líquida em emulsão, (MLE) preparada pela mistura de querosene com D2EHPA (um ácido alquilfosfórico) como carregador móvel e Span-80 como surfactante. A membrana MLE permitiu transporte eficiente do metal, da solução de alimentação para o extrato de coleta em experimentos realizados a 25 ºC. As variáveis significativas no transporte de cádmio através da membrana foram a concentração do extrator e a quantidade de metal na solução alimentadora. A concentração de HCl como agente de coleta afetou somente a taxa inicial de extração do metal, mas não a extensão da extração. A quantidade de surfactante usada neste estudo estabilizou a membrana adequadamente, mas o uso de uma quantidade maior produziu uma menor taxa de extração inicial devido à resistência inferfacial mais alta. Os resultados experimentais sugerem a possibilidade de recuperação ou remoção de metais tóxicos de soluções aquosas diluídas em um extrator baseado em membranas líquidas emulsificadas.It is studied the extraction of cadmium(II) ions from acidic aqueous solutions using a stirred transfer cell-type emulsion liquid membrane (ELM) prepared by dissolving in kerosene, with D2EHPA (an alkylphosphoric acid) as mobile carrier and Span-80 as surfactant. The ELM allowed efficient metal transport from the feed solution to the stripping liquor in experiments carried out at 25 ºC. The significant variables on cadmium transport through the membrane were extractant concentration and metal content in the feed metal-donor solution. Concentration of HCl as stripping agent affected only the initial metal extraction rate but not the extraction extent. The surfactant content used in this study stabilized the membrane adequately, but the use of a higher content produced a smaller initial extraction rate due to higher interfacial resistance. The experimental results suggest the possibility of recovering or removing valuable or toxic metals from dilute aqueous solution in an extractor based on emulsified liquid membranes.

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Section: Extraction Equilibriummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

Basualto¹,

Poblete²,

Marchese³

et al. 2006

J. Braz. Chem. Soc.

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“…The fast kinetics of the sorptive chemical reaction that the metal undergoes with the extractant that is retained in the MC is finally governed by a liquid-liquid reaction, which normally proceeds faster than solid-liquid reactions like produced when using IX solid resins. Figure 6 shows the arrangement of experimental data measured for Cu(II) sorption onto the microcapsules according the linear form of the pseudo-second-order kinetics model expressed in equation (5).…”

Section: (5)mentioning

confidence: 99%

“…Furthermore, several amphoteric precipitates are unstable and tend to re-dissolve according to the acidity of the wastewater. Solvent extraction (SX process) could be an interesting alternative; however, it is more of a productive process to recover metals than a technique to treat polluted wastewaters, although in some cases has been applied for this purpose 5 . However SX is not free of problems, such as the need for using large quantities of expensive organic solvents and the presence of operational difficulties like the loss of the solvent and extractant from the organic phase because of their volatility, mechanical entrainment to the aqueous phase during stirring and crud formation from the fine solid particles in the feed solution to treat.…”

Section: Introductionmentioning

confidence: 99%

MICROENCAPSULATION OF TRIOCTYLAMINE IN POLYMERIC MATRICES FOR REMOVING Zn(II) AND Cu(II) FROM CHLORIDE AQUEOUS SOLUTIONS

Fonseca

Araneda

Yazdani‐Pedram

et al. 2010

J. Chil. Chem. Soc.

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The microencapsulation of the non-specific basic extractant trioctylamine in polymeric matrices synthesized from styrene and divinylbenzene was studied. The microcapsules were prepared by adding the amine compound during in situ free radical suspension polymerization using benzoyl peroxide as the initiator and using variable proportions of both monomers. SEM analysis shows that the microcapsules have a spherical shape presenting an average surface area of 480 m 2 g -1 and a pore size around 0.5 to 1.8 nm. Synthesis of the microspheres was affected by the amount of extractant used and by the proportion of both monomers during their preparation.The obtained microcapsules were used for the sorptive removal of Zn(II) and Cu(II) ions from chloride aqueous solutions, reaching extraction extents near 90% under the best conditions, following an anion-exchange mechanism between the metallic ions and the extractant immobilized onto the microcapsules. Zn(II) and Cu(II) sorption kinetics experiments were performed and efficient uptake of both metals within a few minutes was measured. The experimental results were explained using a pseudo-second-order rate kinetics model, which fit the results of chemisorption of both metals onto the microcapsules well.

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“…SX technologies have consequently become widely recommended for the treatment of high-volume aqueous feed solutions containing high concentrations of metals [3,4]. However, SX processes are not free of operational difficulties, including the formation of stable heterogeneous mixtures (crud) at the aqueous-organic interface resulting from the presence of fine solids suspended in the feed solution, the loss of organic diluent due to evaporation, and the degradation of the extractant molecules by oxidative and thermal causes [5].…”

Section: Introductionmentioning

confidence: 99%

Zn(II) Sorption From Aqueous Solutions Using Polymeric MicrocapsulesContaining 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester

Valenzuela

Ide

Narváez

et al. 2014

SERDJ

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Zn(II) sorption from aqueous solutions was studied on polymeric hydrophobic microcapsules (MCs) containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester as the extractant (PC-88A). The microcapsules were synthesised by adding this extractant during in situ radical polymerisation using styrene and ethylene glycol dimethacrylate (EGDMA) as starting monomers and benzoyl peroxide as the polymerisation initiator. SEM analysis of the microcapsules indicated that they had a spherical shape and a rough surface. A set of experiments was designed to study Zn(II) sorption behaviour onto MCs using aqueous solutions containing 100 mg/L of Zn(II) with an initial pH of 4.0. A Langmuir isotherm model fitted the experimentally observed equilibrium sorption data well. Results of kinetics experiments conducted between 293 and 323 K were well explained by a pseudo-second order kinetic model with an activation energy of 43.27 kJ mol -1 .Calculated thermodynamic parameters revealed that the chemisorption process was spontaneous and exothermic. The observed negative entropy change indicated that the metal bound to the extractant on the surface of MCs would generate a moderately ordered structure.

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The solvent extraction separation of molybdenum and copper from acid leach residual solution of Chilean molybdenite concentrate

Cited by 64 publications

References 11 publications

Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

MICROENCAPSULATION OF TRIOCTYLAMINE IN POLYMERIC MATRICES FOR REMOVING Zn(II) AND Cu(II) FROM CHLORIDE AQUEOUS SOLUTIONS

Zn(II) Sorption From Aqueous Solutions Using Polymeric MicrocapsulesContaining 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester

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