Showing papers in "International Journal of Mineral Processing in 2000"

TL;DR: In this paper, the effect of mineral properties on the compressive strength of the synthesized geopolymer was investigated, and it was shown that a wide range of natural Al-Si minerals could serve as potential source materials for the synthesis of geopolymers.

TL;DR: In this article, the yield stress of concentrated aqueous suspensions of alumina, zirconia and kaolin can be controlled through regulation of pH and the addition of inorganic electrolytes, ionic surfactants and polyelectrolytes (polymers).

TL;DR: In this article, it is shown that the probability of the bubble-particle adhesion from the induction times that can be measured experimentally under different chemical environments can be predicted using various surface chemistry parameters.

TL;DR: In this article, the adsorption mechanisms of natural polysaccharides are reviewed, with the objective of promoting wider applications of the polymers, such as cellulose, starch, dextrin, guar gum, cellulose and their derivatives.

TL;DR: In this article, the design and operation of flocculation processes are discussed in the context of specific requirements of dewatering systems such as sedimentation and filtration, where chemical conditions, reagent selection and process operating conditions are evaluated based on the fundamental mechanisms involved in particle destabilization and floc development.

TL;DR: In this paper, a detailed study of the flotation response of two high-sulfur coals, Illinois No. 6 coal and Pittsburgh No. 8, using different non-ionic oxygenated surfactants as the collector is presented.

TL;DR: In this article, three different methods were compared to perform first-order flotation kinetics analysis and estimate model parameters, and it was concluded that the smallest errors were obtained with Method II.

TL;DR: In this paper, the effect of froth stability on column flotation of finely pulverized coal was examined and the optimum rates were determined to be 2 and 0.3 cm/s for Vg and Vw, respectively.

TL;DR: A micro-flotation study showed that at an ionic strength of 10 −3 M KNO 3, the dosage, molecular weight, and chemical composition of polysaccharide depressants affect their depressing action on talc as mentioned in this paper.

TL;DR: In this article, the application of sonication to the reduction of iron oxide in a silica sand from 0.025% to less than 0.012% Fe2O3 is presented.

TL;DR: In this paper, the effect of particle properties and dispersion on the filtration and dewatering behavior of three different minerals namely kaolin, calcite and quartz in aqueous media have been examined.

TL;DR: In this paper, the authors present the results of a battery of tests conducted in Denver cells to study the sulphide flotation kinetics of four different mine tailings samples which contain 2.9 S, 3.4 S, 16.2 S% and 24.2 s%, respectively.

TL;DR: In this article, the effects of pH, polymer dosage and presence of divalent cations on the flocculation of the Syncrude tailings have been studied using a high molecular weight polyacrylamide flocculant (Percol 727) over a pH range from 3 to 11.

TL;DR: In this paper, the authors present detailed comparisons of the charge behaviour in a centrifugal mill predicted by discrete element methods (DEM) with high speed photographs obtained in an experimental mill.

TL;DR: In this article, the authors show that kerosene cationic emulsions can efficiently agglomerate oxidized coal particles by reducing the size of the oil droplets.

TL;DR: In this paper, a flotation scheme for selectively removing monazite in the rare earth bulk concentrate from the Baiyunebo mine, in China (60.7% rare earth oxides or REO, 75% as bastnaesite and 25% as Monazite) was developed.

TL;DR: In this paper, the efficacy of copper chelating agents as collectors for both copper oxide and sulfide minerals has been assessed through contact angle measurements, and the results are presented as average values for the pH range where only finite contact was observed.

TL;DR: In this paper, the kinetics of leaching laterite with hydrochloric acid was investigated at dilute solid phase concentrations in a magnetically stirred reactor and the effects of acid concentration and temperature on the dissolution rate of iron were reported.

TL;DR: A comprehensive review of the recent advances in selective flocculation technology, which facilitates overcoming these barriers, is presented in this article, which includes identification/design of selective reagents based on the surface chemistry of particles, use of site blocking agents to minimize heteroflocculation, and tailoring the polymer characteristics vis-a-vis particle size to achieve the desired separation efficiency.

TL;DR: In this paper, the reaction appears to be a high temperature oxidation induced by the high laser (∼25 mW at 514.5 nm) power density at freshly cleaved galena surfaces.

TL;DR: In this article, the effect of dry and wet grinding on the flotation of complex sulfide ores from the Merensky Reef in South Africa was investigated, and it was shown that the activated particle surfaces from the dry ground ores accelerated the dissolution of the particles, as well as the adsorption of reagents onto the particle surfaces.

TL;DR: In this article, the in-situ Fourier transform infrared/internal reflection spectroscopy (FT-IR/IRS) with reactive internal reflection elements (IREs) was extended to study oleate adsorption at a calcite surface.

TL;DR: In this paper, a polyethylene oxide (PEO) flocculant was found to be very effective for flocculation of the Syncrude tailings in varying hydrodynamic conditions.

TL;DR: In this paper, the mechanism of separation of mineral particles using fluidization technique is described in which a mixture of binary particles with sufficiently different physical properties is particulately fluidized, under some operating conditions the mixture separates and displays a behaviour called layer inversion.

TL;DR: In this paper, the binding mechanism of the fly-ash-based binder and the bentonite fiber mechanism was investigated and it was found that the two mechanisms were determined to be incompatible.

TL;DR: In this article, the effect of the addition of silver chloride on the bioleaching of chalcopyrite concentrate, which contained pyrite, sphalerite and galena as sulfide gangue minerals, has been investigated using Thiobacillus ferrooxidans.

TL;DR: In this paper, a planetary ball mill was used to investigate the effects of grinding and addition of α-alumina powder as a seed on the transformation of two compounds to α-phase during heating.

TL;DR: The wettability and hence the floatability of coal are influenced markedly by its oxidation as well as the presence of dissolved inorganics in the system as mentioned in this paper, and the mechanisms involved are discussed in this paper.

TL;DR: In this article, the mechanism of copper-activation of sphalerite was studied at pH 9.2 using a carbon matrix composite (CMC) electrode containing spalerite particles.

TL;DR: In this article, the influence of particle shape and size on the partition curve changes with particle shape in cylindrical cyclones in dense medium separation (DMS) systems devoted to plastic recycling.