Showing papers in "Hydrometallurgy in 1985"

TL;DR: In this article, the solvent extraction behavior of solutions of Versatic 10, naphthenic, 2-bromodecanoic and 3,5-diisopropylsalicylic acids in xylene towards a large number of metal cations is described.

TL;DR: In this article, the leaching of various oxidized zinc ores in different solvents has been studied in laboratory tests by agitation leaching and in some cases by percolation leaching.

TL;DR: In this article, a calcined catalyst was roasting at 850°C (water vapour pressure 0.253 bar, N2 atmosphere) and subsequent leaching of the roasted catalyst with water at its boiling point for 1 h dissolved 81.85% V and 81.78% Mo and minor amounts of other constituents.

TL;DR: In this paper, the authors investigated the extraction of iron(III) from aqueous solutions containing sulphuric, hydrochloric and nitric acids by di(2-ethylhexyl)phosphoric acid (DEHPA) in kerosene.

TL;DR: In this article, the authors show that the precipitation method is considerably less expensive than recovery by extraction or by other proposed routes: $60/lb at phosphoric acid capacity of 300 kt/a P2O5 with solvent extraction and $41/lb yellow cake with the new precipitation route and the same capacity.

TL;DR: In this article, a factorial design experiment was performed to determine the effects of four different components (H2SO4, HCl, HF, H2SiF6) on cadmium extraction with Alamine 336.

TL;DR: In this paper, a mechanism which accounts for the observed current increase in the presence of Fe 2+ is proposed which involves a redox reaction between dissolved Fe 2 + and cupric ion in the copper sulfide product layer.

TL;DR: In this paper, the solubility of silver chloride in various FeCl 3 -FeCl 2 -HCl solutions has been measured over the temperature range 20 −100°C; the densities of the associated saturated solutions have also been determined.

TL;DR: In this paper, the extraction of Ti(IV), Fe(III) and Fe(II) with di-o-tolyl phosphoric acid (HDTP, HA)-benzene-20% hexan-1-ol system was studied as function of contact time, concentrations of extractant in the organic phase and of H2SO4 in the aqueous phase, and temperature.

TL;DR: In this article, a method for processing this material based on leaching in- hydrochloric acid-sodium chloride medium, cyclone separation of matte particles, and precipitation of iron, arsenic, antimony and bismuth in the presence of calcium ions at a pH of 3.5, leaving a residue of these metals together with lead.

TL;DR: In this article, the extraction of Fe(III) from concentrated aluminium nitrate solutions by Versatic 10 in Escaid 110 was studied, using an AKUFVE system for the determination of extraction isotherms at constant pH values.

TL;DR: In this article, the dissolution rate of heazlewoodite in nitric acid solution has been determined and the effects of acid concentration, temperature, particle size, stirring intensity and addition of Cu 2+ ions have been investigated.

TL;DR: In this article, a technique has been developed to study the rate of extraction of cobalt from an aqueous phase into a growing drop of heptane containing di(2-ethylhexyl) phosphoric acid (D2EHPA).

TL;DR: Aqueous acetonitrile and aqueous acetone strip gold in < 8 h using 2-3 bed volumes at temperatures between 25 and 70°C as discussed by the authors.

TL;DR: In this article, a flow-sheet for a solvent extraction process for treatment of various qualities of wet-process phosphoric acid solutions is proposed based on a cadmium purification level of 1 mg/kg, extraction, stripping and scrubbing sections of the process would contain two, two and one stages, respectively.

TL;DR: In this paper, the effect of the Fe(III) and Fe(II) concentration on the current efficiency for copper electrowinning using the Chemelec cell was investigated, and the mass transfer coefficients for these cationic species were determined.

TL;DR: In this paper, a detailed study has been carried out to investigate the possibility of recovering vanadium by resin ion exchange from acid sulfate solutions containing 10 mg/l vanadium.

TL;DR: In this paper, the dissolution of kaolinite clay in hydrochloric acid solutions has been carried out in the presence of fluoride ions, and the activation energy for the leaching of clay calcined at 540°C is decreased from 71 kJ/mol to 23 kJ /mol in the case of fluoride ion.

TL;DR: In this article, the kinetics of the cementation of uncomplexed silver ions from low concentration solutions on to zinc and on to ferrous materials have been studied using a rotating disc reactor system.

TL;DR: In this paper, a number of extractants, such as Alamine 336, a tertiary amine, was found to be the most satisfactory reagent for the extraction, requiring one to three theoretical stages.

TL;DR: In this paper, it has been found that Re(VII) can be quantitatively separated from Mo(VI) in alkaline solutions by synergistic extraction with primary amine and neutral phosphorus esters.

TL;DR: In this paper, a microcomputer program is developed to model equilibrium data for the liquid-liquid extraction of metals, even when redox equilibria and precipitation occur, based on chemical interactions, require the total concentrations of the introduced components and the formation constants of the species as parameters.

TL;DR: In this paper, the infrared spectra of the single metal and mixed metal Versatic solutions were recorded at 25 and 160°C, and the retention factors of all mixed iron-nickel solutions were the same, and different from those of iron-only or nickel-only Versatic.

TL;DR: An electrohydrometallurgical method has been identified which facilitates the selective separation of zinc from a chalcopyrite-sphalerite concentrate as discussed by the authors, achieving over 80% zinc extraction with less than 0.2 wt% copper dissolution.

TL;DR: The fine fraction (below 74 μm) of the slag from a zinc cathode melting furnace contains about 80% zinc as mentioned in this paper, and zinc from this slag may be recovered as zinc dust by electrolysing sodium zincate solution.

TL;DR: In this paper, the fundamental chemistry which underlies the extraction and separation of precious metals is considered, and the title reagent may be used to separate the precious metals from each other.

TL;DR: In this paper, the leaching of a fluidised-bed ash with hydrochloric and nitric acids under a variety of conditions has been examined and it was shown that the rate of extraction of both aluminium and iron increased sharply with increasing temperature and with increasing acid concentration.

TL;DR: In this article, a sample of crude copper crystals produced by the CLEAR Process was refined by dissolution and recovery in sulfate media using the Parker acetonitrile process, which offers an alternative method of copper recovery to electrorefining, and allows a range of Eh and pH conditions to be used to provide further discrimination of impurities.

TL;DR: In this article, column leaching tests are used to compare the leaching characteristics of several types of uranium tailings, as influenced by the methods employed in obtaining the tailings samples, the manner in which tailings are loaded into lysimeters, and the aerobic/anaerobic conditions of the leach tests, are investigated.

TL;DR: In this article, the authors describe the effect of the following cations - Si, Al, Mg, Ca, Fe, U - on the generation of the crud, which is a type of stable emulsion.