Showing papers in "Minerals Engineering in 2011"

TL;DR: In this paper, the car catalytic converters were characterized through different techniques such as X-ray diffraction, scanning electron microscopy and inductively coupled plasma, and a new alternative to recover at least the 95% of the platinum-group metals (PGM) present in the CARs by the application of lees aggressive, corrosive or expensive reagents and conditions is proposed.

TL;DR: In this paper, the energy and greenhouse gas footprints of some of the various technologies that are used for processing nickel laterite ores have been assessed using life cycle assessment methodology based largely on publicly reported inventory data.

TL;DR: In this article, a cyanide generating bacterium was used to leach out gold and copper from the waste mobile phone printed circuit boards (PCBs) containing ∼34.5% Cu and 0.025% Au in YP (yeast extract and polypeptone with glycine) medium.

TL;DR: In this paper, the authors examined the possibility of using bacteria that can bring about the reductive dissolution of ferric iron minerals and thereby facilitate the extraction of nickel from a lateritic ore at relatively low.

TL;DR: In this paper, the authors present an analysis of 3D simulation of a grinding mill carried out using the EDEM software package customised to predict the rate of wear of lifter geometry.

TL;DR: In this article, the influence of reduction conditions on the metallization degree of the samples, such as reduction temperature, C/Fe molar ratio, pre-oxidation and additives were studied.

TL;DR: In this article, the major process flow sheets in practice for the recovery of chromite values from various types of ores and critical issues related to chromite ore beneficiation are reviewed.

TL;DR: In this article, the influence of important factors on smithsonite flotation were investigated and the appropriate temperature for flotation was found to be 30-40°C, where the ratio of the mixed collectors and the sequence of addition of mixed collectors were important criteria in attaining true mixed collector flotation.

TL;DR: In this article, the authors introduced the use of Smoothed Particle Hydrodynamics (SPH) to model the flow of slurry (water and fine material) through a double deck banana screen.

TL;DR: In this paper, the authors investigated the current state of knowledge with respect to the understanding of the characteristics and mineralogy of large particles and how these influence leaching in a heap context and the tools to characterize these.

TL;DR: In this paper, pyrite was added to act as a catalyst to enhance the leaching rate of the copper concentrate, and a copper recovery higher than 80% in 24h was achieved at a redox potential of 410mV vs Ag, AgCl, a temperature of 85°C, 15g/L of initial acid concentration, a solid content of 7.8% (w/v), a total initial iron concentration 5 ǫ g/L and pyritic to copper sulphide minerals mass ratio 2:1.

TL;DR: In this article, a planetary mill was used to ground Hematite powder (Fe2O3) to investigate size reduction and the mechanochemical effect by X-ray diffraction (XRD) line broadening, specific surface area and particle size and morphology analysis.

TL;DR: In this paper, a new comminution method has been developed by applying high voltage pulses at specific energy 1 − 3 kWh/t to pre-weaken mineral particles, leading to reduction in energy consumption in the downstream grinding process.

TL;DR: In this paper, the effects of temperature, time, reductant type and CaO content on the conversion percentage of the total nickel to metallic nickel (α Ni ) in the nickel laterite ore reduction process were investigated.

TL;DR: In this article, the surface charge distribution of muscovite and vermiculite was evaluated using electrokinetic zeta potential measurements and potentiometric titrations, and the results showed that muscivite particles have an apparent negative charge due to the high aspect ratio of the negatively charged tetrahedral faces to the edges within a tetrasilicate-octahedral-tetrahedral layer configuration.

TL;DR: A number of collision models for perikinetic and orthokinetic collisions for simple, laminar shear flows as well as collisions associated with differential sedimentation have been developed over the past 100 years.

TL;DR: In this paper, a laboratory physical model test has been performed to evaluate the structural stability of a new tailings impoundment, where the tailings particle composition and distribution below a beach, the change of phreatic surface of the dam, and the engineering properties of tailings of dam profiles have been measured.

TL;DR: In this paper, waste macadamia nut shells were investigated for potential use as a hard organic precursor for the production of a granular activated carbon material and the pore structure and gold loading capacity of the synthesised activated carbons were investigated.

TL;DR: In this paper, a shrinking core kinetic model was used to compare, contrast and rationalise the leaching behavior of metal values in the presence or absence of SO2, Na2SO3, NaCl and CaCl2.

TL;DR: In this article, the removal of free cyanide from aqueous solution by oxidation with hydrogen peroxide H 2 O 2 catalyzed by copper-impregnated activated carbon has been investigated.

TL;DR: Germanium recovery from real fly ash (FA) leachates was studied using ion-exchange procedures as discussed by the authors, which was based on germanium complexation with catechol (CAT) in an aqueous solution followed by the retention of the Ge-CAT complex onto a conventional strongly basic anionic resin (IRA-900).

TL;DR: In this paper, the spatial distribution of cracks and mineral dissemination in particles derived from a sphalerite ore in the Northern Cape, South Africa, was characterized using a high-resolution industrial X-ray CT system.

TL;DR: The acid rock drainage index (ARDI) as discussed by the authors was developed to predict acid formation based on intact rock texture and five textural parameters which have direct control on acid formation are evaluated.

TL;DR: Las Luces is a copper-molybdenum beneficiation plant in Taltal (Chile), owned by the Las Cenizas Mining Group (Grupo Minero Las CENizas) of Chile as discussed by the authors.

TL;DR: In this article, the ammonia-cyanide leach system was used to selectively leach up to 90% of gold with minimum copper dissolution, and recommended leach compositions, Eh and pH, were provided to enable process control measures to be adopted for a variety of ores.

TL;DR: In this article, life cycle assessment methodology is used to indicate where in the metal production life cycle this focus on energy efficiency should be and to evaluate a number of potential opportunities for reducing the greenhouse gas footprint of primary metal production.

TL;DR: The authors developed QEMSCAN technology to rapidly acquire spatially resolved mineralogical data from non-sulphide zinc ores from Accha (Peru) and Skorpion (Namibia).

TL;DR: In this article, the effect of slurry rheology on gas dispersion in a 100 l pilot-scale Batequip mechanical flotation cell was investigated using Kaolin, Bindura nickel and Platreef slurries.

TL;DR: In this paper, the experimental results of the extraction of nickel and cobalt by high pressure acid leaching (HPAL) of a refractory limonitic nickel laterite ore from the Gordes region of Manisa in Turkey were described.

TL;DR: In this article, the application of fly ash porous pellets as adsorbent of lead(II), zinc(II) and chromium(III) ions from aqueous solution was studied.