Showing papers in "International Journal of Mineral Processing in 2008"

TL;DR: In this paper, a conceptual 4-stage model is proposed which explains all the general dissolution behaviour that is widely observed, i.e. of an induction period and a parabolic rate curve that may or may not be followed by linear rate behaviour.

TL;DR: The processing techniques of phosphate ores depend mostly on the type of associated gangue minerals present in the mined rock and simple, inexpensive techniques are enough to produce the required grade.

TL;DR: In this paper, the authors have studied the flotation characteristics of oxidised Indian high ash sub-bituminous coal having particle size below 1mm and found that this coal has potential to give a product of around 31% ash content with 80.4% yield from 41-42% of feed coal.

TL;DR: Wang et al. as mentioned in this paper used thin film pressure balance (TFPB) technique to determine the surface forces in foam films stabilized with flotation frothers such as n-pentanol, n-octanol, methyl isobutyl carbinol (MIBC), and polypropylene glycol (PPG).

TL;DR: In this paper, the copper extraction yield from thermophilic bioleaching of chalcopyrite depends on temperature, pH, and the oxidation-reduction potential (ORP), as well as on the activity of the thermophile used.

TL;DR: In this article, the effects of particle size, conditioning time and airflow rates on the dynamic froth stability were determined in terms of maximum froth height in a modified Denver flotation cell measuring the height of the froth column.

TL;DR: In this paper, the effects of flocculant adsorption, applied shear and solids dilution on the aggregate structures formed were examined in terms of the reaction profiles obtained while varying different conditions (dosage, solids concentration, shear rate, split dosing).

TL;DR: The zeta potential of bubbles generated by ultrasonication was determined for a range of frother types as discussed by the authors, at concentrations close to flotation practice, for a single frother type.

TL;DR: In this article, the authors used the DEM to model the load behavior of an industrial dry tumbling mill used for the grinding of coal at Eskom Kendal power station in South Africa.

TL;DR: In this article, the speciation of various gold and silver chloride species was evaluated to determine their stability in a chloride solution, and the optimum conditions were then chosen to leach a mine tailing containing gold and Silver.

TL;DR: In this paper, the structural changes in olivine (Mg, Fe) 2 SiO 4 (deposit Aheim, Norway) generated by its mechanical activation were evaluated using high-energy milling in laboratory planetary and attrition mills as well as in an industrially nutating mill.

TL;DR: In this article, the role of microstructure on particle breakage and crushing response of rocks was analyzed for four quarries that produce crushed aggregate in Brazil and it was found that the appearance of non-normalizable single-particle breakage functions and the effect of particle size on strength may be explained on the basis of a number of microstructures identified.

TL;DR: In this article, the separation performance of a Floatex Density Separator (FDS) for Indian coals has been studied and it is found that both density and size have substantial influence on separation performance.

TL;DR: In this article, the effects of microwave treatment on the liberation spectrum of a rod-milled South African carbonatite ore are presented based on quantitative mineralogical analysis, and it is inferred that microwave treatment induces changes in the fracture pattern, favouring liberation of microwave susceptible minerals at larger particle sizes.

TL;DR: In this paper, the authors measured interaction forces between a hydrophilic silica particle and an air bubble using simplified model systems with deionized water and dilute KCl solutions, and estimated the bubble surface potential from fitting the AFM-measured forces to the Hogg-Healy-Fuerstenau (HHF) model.

TL;DR: Results indicate that a hybrid network which is a combination of 4 separate neural networks gave the most accurate HGI prediction and all of the neural network models outperformed non-linear regression in the estimation process.

TL;DR: In this article, a continuous system including a feed tank and two-stage aerated stirred tank bioreactors, each with a worked volume of 2.1 l, was established.

TL;DR: In this paper, different solid-state reaction models, by interpretation of the model graphs in terms of goodness of fit to real data points (R -squared), are used to evaluate the reaction mechanism and the kinetics (E, n ) for the thermal decomposition of Hekimhan-Deveci siderite ore samples.

TL;DR: In this paper, a new modelling technique for simulating hydrocyclone performance has been developed, in which particles in every size fraction of the feed ore are classified based on ore texture type, taking into account that the same ore texture types in every fraction of feed ore have similar mineral contents and densities.

TL;DR: In this article, the effects of dodecylamine (DDA), kerosene and pH on the recovery of combustible matter and ash content of a lignitic coal from Tuncbilek, Turkey have been studied using a three-variable and two-level (2 3 ) factorial experimental design.

TL;DR: In this article, the removal mechanisms effective in the sequestration of Pb(II and Hg(II) on nonviable activated sludge biosolids at batch biosorption tests were investigated.

TL;DR: In this article, the authors investigated the comminution behavior of high strength spherical composite particles and found that the diameter of the contact area depends upon input energy (impact velocity in impacts and loading rate in compressions).

TL;DR: In this paper, a mathematical model of the straight-grate induration process is presented, which is validated by comparing its predictions with actual measurements in an industrial scale plant as well as a pilot pot grate.

TL;DR: In this paper, the authors studied the mechanism of three-phase contact (TPC) formation and phenomena occurring during collisions of the ascending bubble with a solid and flat surface on three fluorite samples of different origins and surface roughness and smooth mica plates were investigated.

TL;DR: Extracellular bacterial protein (EBP) isolated from Paenibacillus polymyxa was fractionated through ammonium sulphate precipitation (ASP) method and characterized through SDS-PAGE as mentioned in this paper.

TL;DR: In this paper, a simple theoretical approximation is proposed that relates froth recovery to the relevant froth parameters, such as gas rate into the cell, the air recovery and the change in bubble size over the cell.

TL;DR: In this paper, a mixture of K-CHA and K-H with high cation exchange capacity was synthesized as a potassium type zeolite under the reaction condition of 433 K, 3 h, 3.0 m 3 KOH.

TL;DR: A combination of SEM (Scanning Electron Microscopy) combined with Energy-Dispersive X-ray analysis (EDX), XRD, X-Ray Fluorescent (XRF) and Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES) was used to characterize a bulk complex sulphide ore deposit in Ishiagu, in Ebonyin State, South Eastern part of Nigeria.

TL;DR: In this article, the optimization of the dissolution of magnesite in citric acid solutions by Taguchi Method was studied. And the results showed that under optimal leaching conditions, the extraction of Magnesite can be 99.90%.

TL;DR: In this paper, results from pilot-scale thickener experiments with tailor-made yield stress slurries are presented and compared to companion Computational Fluid Dynamics (CFD) simulations.