Showing papers in "Hydrometallurgy in 2009"

TL;DR: In this paper, a novel process was conducted with experiments which separated and recovered metal values such as Co, Mn, Ni and Li from the cathode active materials of the lithium-ion secondary batteries.

TL;DR: A review of existing and potential processes from the open literature that have been proposed for high silica bauxites is presented in this paper, where the processes have been divided into three strategies for reducing soda loss: reducing the input of reactive silica into the process, modifying the process to produce a low soda residue and recovering caustic soda by reprocessing residue.

TL;DR: A review and evaluation of the recovery studies and associated technologies for metals from spent batteries can be found in this paper, where the main aim is to review and evaluate various metal recovery processes including physical, pyrometallurgical and hydrometalurgical ones.

TL;DR: In this paper, the acidithiobacillus ferrooxidans (A. f.) was used for bio-leaching copper from printed circuit boards (PCB).

TL;DR: In this article, a review of the application of solvent extraction for treating leach solutions is presented, where solvent extraction is used to extract valuable metals from spent hydrodesulphurization catalysts, such as molybdenum and vanadium.

TL;DR: In this article, the main methods for separation, purification and recovery of molybdenum and vanadium from leach solutions of spent catalysts are reviewed, including sulphide precipitation, ammonium salt precipitation, carbon absorption, ion exchange and solvent extraction.

TL;DR: In this article, the effect of embedded magnetite particles on the uptake capacity and rate of adsorption was clarified, and the maximum uptake capacities obtained at 25°C were 0.82 and 1.68 mmol/g for RIa and RIa-mag, respectively.

TL;DR: In this paper, the authors examined the leaching of the chalcopyrite concentrate, from the Rudnik flotation plant, by sodium nitrate in sulphuric acid media, and the influence of various parameters was studied to optimize the conditions and to determine the kinetics of the reaction.

TL;DR: Melamine-formaldehyde-thiourea (MFT) as mentioned in this paper is a chelating resin that is used in the separation and recovery of palladium(II) from copper-II and zinc-II base metal ions.

TL;DR: In this article, the authors apply the theory of crystallization kinetics to the analysis and design of aqueous inorganic hydrometallurgical precipitation systems and emphasize the critical role of supersaturation in controlling the properties (crystallinity, stability, particle size and cleanliness) of precipitated compounds.

TL;DR: In this paper, the optimal condition for leaching a mol of PbO at room temperature (20°C) was found to be: 1/3 as the starting Pb oxide/water ratio and 15min of reaction time.

TL;DR: In this paper, a cornstalk was used as reductant for reduction roasting of low-grade manganese dioxide ores, and sulfuric acid was employed as leaching solvent for the roasted ore.

TL;DR: A hydrometallurgical procedure has been developed for the separation and recovery of nickel, cobalt and rare earths (RE) from spent Ni-MH batteries.

TL;DR: In this article, the hydrometallurgical extraction of zinc from steel dust and sludge was studied and the results showed that over 99% of the zinc was extracted from the sludge with 0.3 M HCl solution but the amount of iron in the solution was higher than for the pure ferrite treatment.

TL;DR: In this paper, a series of orange peel cellulose biosorbents has been specifically prepared by different chemical modifications to understand the mechanism of copper adsorption from chloride solutions, and different biosorbent and raw orange peels were characterized using elemental analysis and Fourier transform infrared spectroscopy (FTIR).

TL;DR: In this paper, the impact of leaching recovery of Zn and its concomitant metals was checked through experiments, and the kinetic study indicates that the calculated activation energy is 45.7 kJ/mol, which illuminates that alkaline leaching the refractory hemimorphite [Zn4(Si2O7)(OH)·H2O] zinc oxide ores is controlled by the chemical process of the reaction of leach liquor and ores in the whole leach process.

TL;DR: In this article, the effects of temperature, sodium hydroxide concentration, alkali-to-titanium slag mass ratio and reaction time on the titanium extraction were studied.

TL;DR: In this article, citric acid based reagents were reacted with PbSO4, in aqueous media for achieving lead recovery simultaneously with desulphurization, and the lead citrate product was characterised by SEM and XRD analysis.

TL;DR: In this article, two modified melamine resins have been prepared and investigated, the modification process took place through the treatment with thiourea to produce R1 or tetraoxalyl ethylenediamine (TELEN) to create R2.

TL;DR: In this article, the solvent extraction of rare earth metals from chloride and nitrate solutions by binary extractants, such as salts of trioctylmethylammonium with dialkylphosphinic acid in toluene, as a function of the compositions of the aqueous and organic phases was studied.

TL;DR: In this article, a novel process was proposed for preparing titanium dioxide by the decomposition of titanium slag in sodium hydroxide system under atmospheric pressure, and the results on effect of reaction temperature, particle size and NaOH-to-slag mass ratio on titanium extraction showed that the temperature and particle size have significant influence on the titanium extraction.

TL;DR: In this paper, the effect of pH on the bioleaching of a low-grade, black schist ore from Finland containing pyrrhotite, pyrite, pentlandite, chalcopyrite and other mineral sulfides was studied using columns containing 9.0 kg of agglomerated ore that was irrigated with nutrient supplemented surface water from the deposit at ambient temperature.

TL;DR: In this paper, secondary minerals formed during chalcopyrite passivation in the presence of iron and sulfur-oxidizing bacteria ( Acidithiobacillus ferrooxidans ) in mineral salts solution were characterized with X-ray diffraction, Fourier transform-infrared spectroscopy, and Raman spectrography.

TL;DR: In this paper, the leaching behavior of metals from a limonitic laterite was investigated using a sulfation-roasting-leaching process for the recovery of nickel and cobalt.

TL;DR: In this article, two kinds of cotton fiber/chitosan composite adsorbents (SCCH and RCCH) were employed to adsorb Au(III) ions from aqueous solution.

TL;DR: In this article, a two-step counter-current leaching approach was developed to extract vanadium from black shale using pressure acid leaching and the results showed that the leaching efficiency of vanadium in the two-stage process could reach above 90%.

TL;DR: A combination of white rot fungi Trametes versicolo r and montmorillonite type clay was studied for its ability to remove copper(II) ions from copper contaminated solutions.

TL;DR: In this article, the authors investigated the synergistic effect of TBP on the system D2EHPA/kerosense/M2+ with respect to the extraction of some transitional metals.

TL;DR: In this paper, a new process was proposed for the leaching and recovery of niobium and tantalum from a low-grade refractory Niobium-tantalum ore after adding pure Nb(2)O(5) to adjust the niobiam to tantalum ratio.

TL;DR: In this article, the authors conducted experiments in order to determine the optimum conditions for agitation leaching by studying various parameters, including time, acid concentration, leaching temperature and particle size.