Showing papers in "Minerals Engineering in 2016"

TL;DR: In this article, an overview of the processes investigated for the extraction, separation and recovery of lithium from not only a technological perspective but also from a chemical perspective is presented, which can contribute to improving the extraction and recovery processes of lithium toward the sustainability of this critical element and can provide future research directions.

TL;DR: In this article, the authors deal with experimental studies regarding the thermo-physical properties of granite, sandstone and basalt in the temperature range of 25 to 1000 degrees C. The results of these measurements and analyses are linked to microwave irradiation tests at 17.5 kW power.

TL;DR: In this paper, air was dissolved into water at pH 7 and different pressures, and a flow was depressurized through a needle valve to generate 150-200nm (mean diameter) NBs and MBs-microbubbles (about 70μm).

TL;DR: A comprehensive review of the fundamental studies of depression mechanisms and effectiveness of commonly used reagent systems to depress pyrite is presented in this article, which includes inorganic reagents (hydroxyl ions, oxygen conditioning, cyanide, sulfoxyl reagents, etc.), organic reagents such as polysaccharides (starch, dextrin, carboxymethyl cellulose etc.), polyacrylamides, wood-extracted biopolymers, diethylenetriamine and a combination of these methods.

TL;DR: In this paper, a coarse-grained (CG) model is developed to model the swirling multiphase flow in a dense medium cyclone (DMC) and the error caused by the CG concept is quantified by carrying out controlled numerical calculations to directly compare the simulated results between a standard CFD-DEM model and a CG CFD−DEM model.

TL;DR: In this article, the authors investigated and developed a better understanding of the combined effects of time and sub-zero temperatures on a key rheological property (yield stress) of CPB.

TL;DR: In this article, a combined sulfation-roasting-leaching process was developed to selectively leach the rare-earth elements (REEs) while leaving iron undissolved in the residue.

TL;DR: Deep eutectic solvents are a form of ionic liquid that are mixtures of salts such as choline chloride with hydrogen-bond donors such as urea as discussed by the authors.

TL;DR: In this article, the effect of two divalent cations in seawater, Mg 2+ and Ca 2+, on the floatability of chalcopyrite and molybdenite is presented.

TL;DR: In this article, the dissolution process and passivation mechanisms of chalcopyrite in the presence of sulfur and iron oxidizing microorganisms were investigated. And a model of dissolution and passiv mechanisms of Chlopyrite was provided, which is based on density functional theory and X-ray photoelectron spectroscopy.

TL;DR: In this paper, the authors focused on the leaching behavior of the four most extractable elements present within red mud (iron, titanium, aluminium and silicon) by varying the experimental conditions, acid concentration, and type of acid, a comprehensive dataset of leaching trends was obtained.

TL;DR: In this paper, a numerical study of the multiphase flows and performance of hydrocyclone by means of two-fluid model, with special reference to particle density effect is presented.

TL;DR: In this paper, the authors developed a virtual simulation environment that can be used to gain fundamental understanding regarding internal processes and operational responses of a cone crusher, which can not only be used for understanding but also for development of new crushers and for optimisation purposes.

TL;DR: In this article, the effect of chemical citric acid and other leaching reagents including inorganic acid, organic acid, and other organic acid on nickel extraction from low-grade Indonesian saprolitic ores was evaluated.

TL;DR: In this paper, a collector mixture of sodium oleate (NaOL) and dodecyl trimethyl ammonium chloride (DTAC) demonstrates a high selectivity for the flotation of spodumene from feldspar.

TL;DR: In this article, a GC-MS-based method was developed to directly measure the decomposition products in the gas phase, and the effect of pH on decomposition behavior was examined in the pH range of 1.5-12.5.

TL;DR: In this paper, the flotation behavior of scheelite and calcite was investigated using mixed cationic/anionic collectors of dodecylamine (DDA) and sodium oleate (NaOL).

TL;DR: The co-existing anaerobic fermentative bacteria with the ability to use lactate as electron donor could explain the differences between actual lactate consumption and what would be expected based solely on sulfate reduction.

TL;DR: In this article, the reprocessing of once disposed tin tailings from a historic German tin operation through different surface properties based processing techniques was investigated, and the results showed that around 80% of the fine (−50μm) to very fine (−20μm), cassiterite can be recovered.

TL;DR: The history of mineral flotation is a record of over a century of impressive innovations, especially in the development of flotation chemistry and chemicals, the principles of their action, their manufacture and the role they play in sustaining efficiencies and productivities even as the quality and grade of ores decline, and the severity of the challenges increases as discussed by the authors.

TL;DR: In this article, the authors present a novel flotation technique to remove decyltrimethyl-ether-amine (collector employed in Brazilian iron mines) from water, which is known as DAF-dissolved air flotation.

TL;DR: A number of leach systems have been developed for the selective extraction of penalty elements from copper concentrates, including: alkaline sulphide leaching (ASL), hypochlorite leaching, dilute sulphuric acid leaching with aluminium sulphate; and combined pressure oxidation with copper precipitation leaching as mentioned in this paper.

TL;DR: In this article, the authors review the current state of nickel laterite processing and show that heap leaching is a viable and economically attractive alternative to conventional hydrometallurgical options.

TL;DR: In this article, a 3D simulation procedure is presented to assess microwave induced stresses in inhomogeneous hard rocks at a microstructure level, where two components are microwave absorbing (phase A) and transparent (phase T), respectively.

TL;DR: In this article, the effects of Pb(II) ions on the flotation of hemimorphite was investigated by micro-flotation tests, zeta-potential measurements, solution chemistry and Fourier transform infrared spectroscopy.

TL;DR: In this paper, a computational model for use with DEM (Discrete Element Method) is proposed for the five mechanisms applying to particle comminution in AG, SAG and coarse feed ball mills.

TL;DR: In this paper, the impact of the ultrasound wave was examined under different conditions, with the conclusion that improved recovery occurs when ultrasound is applied during conditioning and flotation, which can be explained by the effect of acoustic cavitation that cleans particle surfaces and minimizes slime coatings.

TL;DR: In this article, the authors used FTIR spectra and zeta potential measurements to investigate the effect of acid surface dissolution on the hydrophobicity and floatability of ilmenite.

TL;DR: In this article, first-principles calculations based on density functional theory (DFT) were performed to investigate the adsorption mechanism of the collector α-Bromolauric acid (CH 3 (CH 2 ) 9 CHBrCOOH, α-BLA) on α-quartz (1.0.1) surface.

TL;DR: An environmentally friendly leaching process, consisting of the pretreatment of alkaline pressure oxidation and thiosulfate leaching, has been developed to efficiently extract gold from a high carbon, arsenic and antimony bearing sulfide gold concentrate.