comparative leaching of a sulfidic gold ore in ionic liquid

Comparative Leaching of a Sulfidic Gold Ore in Ionic Liquid ... - Scribd

Comparative leaching of a sulﬁdic gold ore in ionic liquid and aqueous acid withthiourea and halides using Fe(III) or HSO−5 oxidant, J.A. Whitehead, J. Zhang, A. McCluskey, G.A. Lawrance ⁎, Discipline of Chemistry, The University of Newcastle, Callaghan 2308, Australia, a r t i c l e i n f o a b s t r a c t,

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Comparative leaching of a sulfidic gold ore in ionic liquid and aqueous ...

The leaching of gold, silver and base metals from a sulfidic gold ore in the presence of an oxidant (peroxomonosulfate (HSO₅⁻) or iron(III)) and leaching agent (thiourea, chloride, bromide or iodide) is compared in 1-butyl-3-methylimidazolium hydrogen sulfate (bmimHSO₄) and chloride (bmimCl) ionic liquids, as well as in aqueous saturated K₂SO₄ a...

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US Patent for Recovery of gold and silver from precious metals ...

The environmentally friendly leaching process disclosed herein comprises the use of low vapor pressure liquids, such as molten salt mixtures or ionic liquids, and a gaseous or non-gaseous oxidizing agent for dissolving, extracting and solubilizing metals from the precious metals-containing solids, ores and/or slag by-products and recovering them...

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Green Solvents II: Properties and Applications of Ionic Liquids

These kinds of ionic liquids were called as task-specific ionic liquids or functionalized ionic liquids, which are considered as the third-generation ionic liquids. In 2002, Wasserscheid et al. [5] had synthesized three types of chiral cations to build the ionic liquids by use of the common chiral materials.

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US Patent for Recovery of gold and silver from precious metals ...

System for, and methods of, recovering precious metals from precious metals-containing solids are described herein. Methods for the recovery of precious metals from precious metals-containing solids heating a salt mixture to form a molten salt mixture, adding a precious metals-containing solid to the molten salt mixture to form a molten salt/precious metals-containing solids mixture, adding an ...

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US20110314967A1 - Improving the recovery of precious metals ... - Google

The invention provides a novel process for improving the recovery of precious metals from recalcitrant refractory ores by the use of hydrofluoric acid dissolved in ionic liquids. The solution of hydrogen fluoride gas in an ionic liquid is contacted with dry crushed ore at a temperature and for a period of time commensurate with the fracturing of a specific recalcitrant refractory ore.

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Minerals | Free Full-Text | Comparative Study for Flue Dust ...

It is important to check the extraction fluid frequently for impurity avoidance, and pH should be monitored before the experiment. The leaching container was secured in a rotary reactor device, which rotated at 30 ± 2 rpm speed for 18 h. After tests, leaching solutions were subjected to determine the concentrations of calcium and arsenic.

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'Green' leaching: recyclable and selective leaching of gold-bearing ore ...

The recovery of gold and silver from ore in an ionic liquid is reported for the first time. The 1-butyl-3-methyl-imidazolium hydrogen sulfate ionic liquid (bmim+HSO4−) was employed, with iron(III) sulfate oxidant and thiourea added. Selective extraction of gold (≥85%) and silver (≥60%) from powdered ore (of dominantly chalcopyrite/pyrite ...

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Application of Ionic Liquids in Extraction and ... - SpringerLink

Figure 5.2 shows the comparative leaching of gold and silver from ore using aqueous H 2 SO 4 or [Bmim]HSO 4 in presence of Fe 2 (SO 4) 3 and thiourea [ 7 ]. The extraction of gold was achieved to be >85% from synthetic oxide ore as well as natural sulfide ore at 20-50°C using ionic liquid as a solvent.

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'Green' leaching: Recyclable and selective leaching of gold-bearing ore ...

The first study on metal extraction using ionic liquid was carried out by Whitehead et al. (2004) with 1-butyl-3-methyl-imidazolium hydrogen sulphate ( [Bmim]HSO 4 ) to take out the precious metals...

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Dissolution of the Rare-Earth Mineral Bastnaesite by Acidic Amide Ionic ...

The interactions between ionic liquids and lanthanide and actinide elements have, for example, been reviewed by Binnemans. 18 Exploitation of these interactions to RE element separation and...

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Full article: Recent advances on hydrometallurgical recovery of ...

High water content in ionic liquid (5 wt %) and high temperature (90 °C) was found to positively influence the leaching of REE by ionic liquids. This is because, high water content and temperature decreases viscosity and improves the diffusion of the lixiviant and consequently increases the leaching efficiency.

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Leaching of chalcopyrite with Brønsted acidic ionic liquid

Compared with leaching of chalcopyrite in acidic aqueous sulphate solutions, the pure ionic liquid and its aqueous solutions exhibited easier leaching of chalcopyrite at higher temperatures which...

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The application of deep eutectic solvent ionic liquids for ...

Application of 1-alkyl-3-methyl-imidazolium ionic liquids in the oxidative leaching of sulphidic copper, gold and silver ores. Hydrometallurgy, 88 (2007) ... J.A. Whitehead, J. Zhang, A. McCluskey, G.A. Lawrance. Comparative leaching of a sulfidic gold ore in ionic liquid and aqueous acid with thiourea and halides using Fe ...

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Comparative leaching of a sulfidic gold ore in ionic liquid and aqueous ...

The leaching of gold, silver and base metals from a sulfidic gold ore in the presence of an oxidant (peroxomonosulfate (HSO5−) or iron (III)) and leaching agent (thiourea, chloride, bromide or...

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Immiscible dual ionic liquid-ionic liquid mineral separation of rare ...

'Green'leaching: recyclable and selective leaching of gold-bearing ore in an ionic liquid. Green Chem., 6 (2004), pp. 313-315. View Record in Scopus Google Scholar ... Comparative leaching of a sulfidic gold ore in ionic liquid and aqueous acid with thiourea and halides using Fe (III) or HSO 5-oxidant. Hydrometallurgy, 98 ...

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Microorganisms | Free Full-Text | Two-Stage Oxidative Leaching of Low ...

Bioleaching may be effectively used to extract nonferrous metals from sulfide ores and concentrates. At the same time, some minerals are refractory and their bioleaching rate is often comparatively low that does not allow the required metal extraction rate to be achieved. In the present work, we studied the two-stage process, which included stages of biological and chemical leaching, to ...

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