Application of 1-alkyl-3-methyl-imidazolium ionic liquids in the oxidative leaching of sulphidic copper, gold and silver ores

Whitehead, Jacqueline A.; Zhang, J.; Pereira, Natalie; McCluskey, Adam; Lawrance, Geoffrey A.

doi:10.1016/j.hydromet.2007.03.009

Cited by 131 publications

(86 citation statements)

References 22 publications

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“…2 (Dong et al, 2009), who carried out the experiment of leaching copper directly from the chalcopyrite with ionic liquid [bmim]HSO 4 with dissolved oxygen as oxidant, IL acids here act like nitric acid, and hydrogen peroxide played as oxidant (Whitehead et al, 2007). Then, the overall reaction for copper dissolution can be expressed as: Dong et al (2009).…”

Section: Ionic Liquid Acid Concentrationmentioning

confidence: 99%

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Comparative study on copper leaching from waste printed circuit boards by typical ionic liquid acids

et al. 2015

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a b s t r a c tWaste printed circuit boards (WPCBs) are attracting increasing concerns because the recovery of its content of valuable metallic resources is hampered by the presence of hazardous substances. In this study, we used ionic liquids (IL) The results showed that all six IL acids could successfully leach copper out, with near 100% recovery. WPCB particle size and leaching time had similar influences on copper leaching performance, while IL acid concentration, hydrogen peroxide addition, solid to liquid ratio, temperature, showed different influences. Moreover, IL acid with HSO 4 À was more efficient than IL acid with CF 3 SO 3 À . These six IL acids indicate a similar behavior with common inorganic acids, except temperature since copper leaching rate of some IL acids decreases with its increase. The results of leaching kinetics studies showed that diffusion plays a more important role than surface reaction, whereas copper leaching by inorganic acids is usually controlled by surface reaction. This innovation provides a new option for recovering valuable materials such as copper from WPCBs.

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Section: Ionic Liquid Acid Concentrationmentioning

confidence: 99%

“…(Berenblyum et al, 2006). Currently, ILs were successfully applied in leaching metals from ores (Whitehead et al, 2007). However, the literature on leaching metals from WPCBs by ILs is limited.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on copper leaching from waste printed circuit boards by typical ionic liquid acids

et al. 2015

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“…Because this solution only consists of 80% IL and 20% oxidant and no water, while solutions of 20, 40 and 60% IL contain calculated amounts of water with oxidant addition. When EmimHSO 4 concentration of 20%, 40%, 60% (v/v) in aqueous solutions with 20% H 2 O 2 ( oxidant) is present, the hydrogen sulfate anion can dissociate releasing H + ions and hence the EmimHSO 4 plays the role of an acid as reported in a previous study for ionic liquid BmimHSO 4 by Whitehead et al, (2007). In the case of 80% (v/v) EmimHSO 4 , the dissociation capability of the hydrogen sulphate anion and ability to act as an acid is reduced because proton hydration cannot occur in the mixture of ionic liquid and oxidant.…”

Section: Zinc Dissolutionmentioning

confidence: 79%

Leaching performance of imidazolium based ionic liquids in the presence of hydrogen peroxide for recovery of metals from brass waste

Kılıçarslan

Sarıdede

2016

REVMETAL

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ABSTRACT:The application of ionic liquids (ILs), 1-methylimidazolium hydrogen sulfate (HmimHSO 4 ), 1-ethyl-3-methylimidazolium hydrogen sulfate (EmimHSO 4 ) and 1-butyl-3-methylimidazolium chloride (BmimCl) as leaching agents was investigated in the leaching of copper and zinc from brass waste in the presence of an oxidant, hydrogen peroxide (H 2 O 2 ). Factors that affect copper and zinc dissolution rates such as ionic liquid concentration, time and temperature were investigated. The results indicated that zinc was dissolved in leach solutions with EmimHSO 4 and HmimHSO 4, completely. Temperature had no considerable influence on copper dissolution rate whilst the rate increased with decreasing IL concentration. In the EmimHSO 4 system, higher copper recoveries were achieved with 40% and 60% IL concentrations compared with IL concentrations of 20% and 80% at 40 °C leaching temperature. Copper dissolution rates decreased with EmimHSO 4 concentration at 60 °C and 80 °C in the following order; 40%>20%>60%>80%. On the other hand the leaching system with BmimCl generally resulted in poor extractions of copper and zinc. RESUMEN: Rendimiento de la lixiviación con líquidos iónicos basados en imidazolio en presencia de peróxido de hidrógeno para la recuperación de metales a partir de residuos de latón.Este trabajo investiga el uso de líquidos ióni-cos (LIs), hidrogenosulfato de 1-metillimidazolio (HmimHSO 4 ), hidrogenosulfato de 1-etil-3-metilimidazolio (EmimHSO 4 ) y cloruro de 1-butil-1-metilimidazolio (BmimCl), como agentes de lixiviación de cobre y zinc a partir de residuos de latón en presencia de un oxidante, peróxido de hidrógeno (H 2 O 2 ). Se estudiaron distintos factores que afectan a la velocidad de disolución del cobre y el zinc, como la concentración del líquido iónico, el tiempo y la temperatura. Los resultados indican que el zinc se disuelve completamente en las disoluciones que contienen EmimHSO 4 y HmimHSO 4 . La temperatura no tiene un efecto significativo en la velocidad de disolución del cobre, mientras que dicha velocidad aumenta al disminuir la concentración del líquido iónico. En los sistemas que contienen EmimHSO 4 , los mejores resultados de recuperación del cobre se obtuvieron con concentraciones del 20% y el 80% de LI, a una temperatura de lixiviación de 40 °C. Sin embargo, la velocidad de disolución del cobre disminuye con la concentración de EmimHSO 4 en los sistemas a 60 °C y 80 °C en el siguiente orden: 40%>20%>60%>80%. Por otro lado, el sistema de lixiviación con BmimCl generalmente dio como resultado extracciones pobres tanto de cobre como de zinc.

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“…The condition of separation is still in the development stage to obtain maximum recovery. Therefore, a lot of researchers are worked further deeply to get best structure of IL for gold separation 1,2,29,65,78,80 . Basically, IL working in specific conditions sample, to obtain the optimum extraction of gold can be achieved by the setting of the character (chemical structure) of IL 58,69,75,81 .…”

Section: Optimization Of Gold Separation Condition By Ionic Liquids Ementioning

confidence: 99%

Solvent extraction of gold using ionic liquid based process

Makertihartha

Zunita

Rizki

et al. 2017

AIP Conference Proceedings

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Abstract. In decades, many research and mineral processing industries are using solvent extraction technology for metal ions separation. Solvent extraction technique has been used for the purification of precious metals such as Au and Pd, and base metals such as Cu, Zn and Cd. This process uses organic compounds as solvent. Organic solvents have some undesired properties i.e. toxic, volatile, excessive used, flammable, difficult to recycle, low reusability, low Au recovery, together with the problems related to the disposal of spent extractants and diluents, even the costs associated with these processes are relatively expensive. Therefore, a lot of research have boosted into the development of safe and environmentally friendly process for Au separation. Ionic liquids (ILs) are the potential alternative for gold extraction because they possess several desirable properties, such as a the ability to expanse temperature process up to 300°C, good solvent properties for a wide range of metal ions, high selectivity, low vapor pressures, stability up to 200°C, easy preparation, environmentally friendly (commonly called as "green solvent"), and relatively low cost. This review paper is focused in investigate of some ILs that have the potentials as solvent in extraction of Au from mineral/metal alloy at various conditions (pH, temperature, and pressure). Performances of ILs extraction of Au are studied in depth, i.e. structural relationship of ILs with capability to separate Au from metal ions aggregate. Optimal extraction conditon in order to gain high percent of Au in mineral processing is also investigated.

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Application of 1-alkyl-3-methyl-imidazolium ionic liquids in the oxidative leaching of sulphidic copper, gold and silver ores

Cited by 131 publications

References 22 publications

Comparative study on copper leaching from waste printed circuit boards by typical ionic liquid acids

Comparative study on copper leaching from waste printed circuit boards by typical ionic liquid acids

Leaching performance of imidazolium based ionic liquids in the presence of hydrogen peroxide for recovery of metals from brass waste

Solvent extraction of gold using ionic liquid based process

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