Showing papers in "Hydrometallurgy in 1976"

TL;DR: In this paper, a study was made of the dissolution of gold in acidic solutions of thiourea containing various oxidants, including iron(III), hydrogen peroxide, oxygen and formamidine disulphide.

TL;DR: In this article, a pure chalcopyrite sample was studied using a potentiometric titration technique, which measures the oxidant consumption in the dissolution of sulphide mineral slurries in acidic ferric ion solutions.

TL;DR: In this paper, two variations of the Goethite process, viz. the Vieille Montagne and the Electrolytic Zinc procedures, have been examined in sulphate and chloride liquors, and their effectiveness in removing iron from solution has been assessed.

TL;DR: In this article, the selective attachment of a thermophilic, pleomorphic autotroph which is similar to Sulfolobus acidocaldarius and tentatively designated Caldariella to the pyritic or chalcopyritic (CuFeS2) phases of a low grade copper orc was observed using a scanning electron microscope.

TL;DR: In this paper, the bacterium Thiobacillus ferrooxidans was used to extract copper from chalcopyrite concentrates obtained from two different locations, and the results showed that the quantity of copper solubilized was directly proportional to the increase in cell mass.

TL;DR: The research and development effort in the field of solvent extraction of non-ferrous metals for the period from mid 1972 to late 1974 has been reviewed in this article, showing that copper is still the main metal of interest for treatment by solvent extraction but also clearly shows the rising interest in the nickel-cobalt area.

TL;DR: In this article, the dissolution of rotating discs of synthetic zinc ferrite was studied in mineral acids, particularly in 1-5 N H 2 SO 4 at 70-99°C.

TL;DR: A general description of the chemical industry of Israel based on the minerals of the Dead Sea is given in this article, where the production processes of potassium, sodium, and magnesium chlorides, as well as bromine and magnesium oxide, are outlined.

TL;DR: In this article, a process by which germanium is selectively extracted from sulphuric acid and hydrochloric acid solutions or mixtures thereof, is described, by using α-hydroxyoxime, fabricated by General Mills (U.S.A.).

TL;DR: In this article, the chalcopyrite oxidation ability of Thiobacillus ferrooxidans is reduced in presence of surface active agents, such as Tween 20, 40, 60 and 80.

TL;DR: In this article, the authors investigated the extraction of copper from chloride solutions using the commercial Lix reagents and found that Lix 64N extracts small amounts of chloride whereas Lix 65N does not.

TL;DR: In this paper, the anodic dissolution of chalcocite (Cu 2 S) has been investigated using a fluidized-bed anode technique using a variety of electrolytes and experimental conditions.

TL;DR: In this article, the effect of chloride ion concentration on extraction was examined, and tracer studies showed that chloride takes no part in the constitution of the extracted zinc complex, and equilibrium studies with the mixed extractants indicate that a mixed complex of the form ZnX 2 · (HA) 2 is extracted, and infra red spectra suggest that Versatic is present as a solvating agent.

TL;DR: In this article, a pre-treatment of sulphide concentrates at 750°C in an atmosphere of natural gas was used to remove excess sulphur from the pyrrhotite present.

TL;DR: In this article, a chelating ion exchange resin is used for copper removal and a novel Levextrel resin for zinc removal from a 40 g/l cobalt advance electrolyte solution at pH 5-6.

TL;DR: In this paper, the anodic dissolution of synthetic covellite (CuS) has been investigated using a fluidizedbed anode technique, and the results of the present study are compared with previous work on the fluidized-bed anodic dissolve of chalcocite.

TL;DR: In this paper, a commercial exfoliated vermiculite was used as an ion exchange medium for the removal of transition metal ions from dilute aqueous solutions, and a simple favorable-equilibrium model for the breakthrough curve was found to fit the data provided the flow rate was less than 1.5 ml/cm2 min.

TL;DR: In this article, sulfide concentrates containing pyrrhotite, pentlandite, and chalcopyrite were leached in aqueous media at 110°C under an oxygen overpressure.

TL;DR: In this article, the structural and electrochemical changes which occur in the solids Cu2S and CuS, as leaching proceeds, are considered in terms of the structural changes that occur, in both solids and solids.

TL;DR: In this paper, high resolution ion exchange has been used successfully to study and separate the various cobalt and nickel complexes present in commercial ammonia-ammonium carbonate solutions produced by the Caron process.

TL;DR: In this paper, a comparison of the extraction of Cu(II) and Fe(III) from chloride and sulphate solutions with LIX 64N in kerosene was made, and attention was paid to the ionic strength of the aqueous media, some of which contained aluminium and magnesium.

TL;DR: In this article, a volume efficiency has been defined and incorporated into a formulation for estimating the separate contributions to observed current efficiencies, in order to obtain exact correlation among current, electrolyte flow, and concentration changes in electrowinning.

TL;DR: In this article, the authors presented data on the crystallization of ammonium paratungstate in laboratory scale batch and continuous crystallizers, showing that in both systems crystals appeared to nucleate at unusually large sizes.

TL;DR: In this paper, anodes having a nominal loading of 5 g/m2 of 70% platinum and 30% iridium alloy on a titanium substrate were employed in repetitive galvanostatic runs at 8.1-540 mA/cm2 in 2 M H2SO4 electrolyte, with and without the addition of 0.5 M CuSO4.

TL;DR: In this paper, it is shown that existing relationships between particle size, sedimentation velocity and fractional hold-up of dispersed phase can be used to obtain characteristic drop sizes from data on sedimentation velocities and hold-ups in batch tests.

TL;DR: In this paper, the potential control of metal and mineral sulphide slurries has been investigated in the context of electro-dissolution processes in hydrometallurgy, and it is concluded that considerable scope exists for the development of electrodissolution process for slurries of mineral sulphides provided that satisfactory potential control can be achieved in the slurry.

TL;DR: The conditions under which cationic species will adsorb intensely onto silicate surfaces have been investigated with a view to specifying basic requirements for successful operation of a water purification process based on silicate/cation interactions as mentioned in this paper.

TL;DR: In this paper, the true distribution coefficient for tracer tracer mercury by benzene from the system HCl-H 2 O in the range 1-10 M HCI was described by a relation containing only one unknown parameter, the true distributions coefficient for HgCl 2.