Showing papers in "Minerals Engineering in 2001"

TL;DR: The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, and gold recovery options as mentioned in this paper.

TL;DR: In this paper, the effect of alkali metal silicate precursor solutions on geopolymerization, in terms of its initial pH-control, on the efficiency of heavy metal (Pb and Cu) containment in geopolymers was examined.

TL;DR: In this paper, the authors focus on recent developments in DEM modelling of tumbling mills and present examples of 3D models of SAG mills along with detailed predictions of power draw, liner wear rates, liner stresses and energy spectra.

TL;DR: In this article, a theoretical evaluation of the origin and role of stored energy in the phenomenon of mechanically-activated dissolution of finely milled minerals has been undertaken, leading to the treatment of stored energies in terms of the generation and retention of crystalline imperfections (dislocations) during extended milling.

TL;DR: In this article, the potential of a mixed population of SRB, isolated from the bottom of a pyritic tailing pond situated in the Spanish pyritic belt, has been investigated with the main objective of treating the effluent generated in the same disposal site.

TL;DR: In this paper, the mineral leaching ability of heterotrophic fungi, through secretion of organic acids, of various laterite ores was studied, and Aspergillus and Penicillium were found to be the most efficient organisms.

TL;DR: In this paper, the tolerance of fungi strains including Penicillium funiculosum, Aspergillus foetidus, and P. simplicissimum for different heavy metals, which could be leached, from nickel laterite ores (Ni, Co, Fe, Mg and Mn) was studied.

TL;DR: Raman spectroscopy and associated imaging techniques are generally non-destructive, and can be used to identify a wide range of minerals and gemstones as mentioned in this paper, which is a sensitive technique which requires minimal sample preparation and is used on massive specimens from lump ore to fine powders and liquids.

TL;DR: A review of gold and electrum flotation can be found in this article, with a focus on the possibility of collectorless flotation of the gold and other gold-containing ores.

TL;DR: The floc flotation of galena and sphalerite fine in the form of flocs has been studied in the present work as discussed by the authors, where the floc formed through hydrophobic flocculation induced by potassium amyl xanthate and kinetic energy input.

TL;DR: In this paper, FT-IR spectroscopy has been used to illustrate its potential as an analytical tool in the determination of CaCO 3 in mixtures of Ca CO 3 and Ca(OH) 2.

TL;DR: A direct bubble size measurement technique which employs a device to collect and expose bubbles has been revived in this paper, where bubbles are collected into a vertical tube filled with water and directed to a flat viewing chamber at the top for imaging.

TL;DR: In this article, three mechanical washing methods, i.e. jet reactor, attrition and ultrasonic washing, were evaluated on a laboratory scale for sand particles with an approximate size of 0.1 mm and an initial diesel content of 5%.

TL;DR: In this article, ammoniacal thiosulfate with copper was used to extract gold from a refractory Au-Cu sulfide concentrate, to replace the current treatment of roasting and cyanidation.

TL;DR: An industrial flotation circuit consisting of five parallel rougher flotation banks, each bank provided with 9 cells of 42.5 m 3, was characterized in this paper, where the air flow rate delivered over the cross-sectional area was directly measured using a simple device that provides a continuous measurement of local gas flow rate.

TL;DR: In this paper, it is shown that under suitable conditions the collision efficiency of particles with the matrix approaches unity, even in the absence of the magnetic traction force, and that the efficiency of capture is determined by the interplay of the static dipolar magnetic interaction and hydrodynamic shear stress.

TL;DR: In this article, the amenability of limonite ore, the iron rich nickel laterite phase, was observed to be less than saprolite, the silicate rich phase, when subjected to biological leaching with heterotrophic microorganisms.

TL;DR: In this article, three cultures, a mesophile T.ferrooxidans (DSM 583), a moderate thermophile Sulfobacillus accidophilus (YTF1) and an extreme thermophile (Sulfolobus BC65), were used to bio-leach the Ok Tedi copper concentrate under the optimal O 2 and CO 2 enriched air in laboratory CSTRs (2L) at 30% o 2 and 10% CO 2 by volume.

TL;DR: In this article, the authors used scanning electron microscopy to image bentonite fibers formed on the iron ore concentrate that composes the pellets and found that these fibers were not inherently formed during iron ore pellet production.

TL;DR: In this article, the Tromp curve which describes separator (classifier) performance can be modelled in terms of d(50)corr, bypass, the fish hook, and the sharpness of the curve.

TL;DR: In this article, the effects of current density, temperature and electrolyte pH have been investigated for nickel-cobalt electrodeposition under galvanostatic conditions in acid sulphate medium.

TL;DR: In this article, the influence of colloidal iron oxide slime on particle flotation was investigated and a combination of physical and chemical methods was most effective at removing the slime from the particles.

TL;DR: In this article, an industrial leaching cycle simulation with the aim of reproducing the real performance of spent catalyst, proposed operating conditions, and verifying that the final residue obtained was not toxic.

TL;DR: In this article, a workbench scale flotation kinetic testwork was conducted, aimed at a better understanding of some aspects of the process used A rate model based on equations for fast floating and slow floating particles was used for describing the cumulative recovery versus time, which showed that the control of collector (amine acetate) at a minimum level was essential for effective action of the activator and modifiers studied.

TL;DR: In this article, the SANE (symbiotic adaptive neuro-evolution) algorithm is able to learn implicitly to eliminate controller interactions in the grinding circuit by taking a plant wide approach to controller design, and the ability of the neurocontroller to maintain high performance in the presence of large disturbances in feed particle size distribution and ore hardness variations is demonstrated.

TL;DR: Gold flotation is often overlooked as a processing option as the precious metal is viewed as being associated with the sulphide particles present in the ore, even when a proportion of the gold is free as mentioned in this paper.

TL;DR: In this paper, the Pacific Ocean manganese nodule samples were leached with dilute sulfuric acid in the presence of phenol type aromatic reducing agents and the results indicated that all the tested phenols were effective reducing agents that significantly increased the extraction of Mn, Cu, Ni, Co from the nodules.

TL;DR: In this article, the significance of stereological bias in a multiphase, natural ore and ascertains whether computer generated theoretical particles accurately represent natural textures are investigated. But, the results suggest that the stereology bias may not be such an important consideration.

TL;DR: In this article, a mathematical model has been developed for an open circuit two-compartment tube mill grinding cement clinker, where sizings were done between the top size and 2 μm, and the breakage distribution function was obtained by using a twin pendulum apparatus.

TL;DR: In order to recover the ultra fine chromite particles from the Karagedik Concentrator tailings, a new process, including Wet High Intensity Magnetic Separation and column flotation, was developed as mentioned in this paper.