Showing papers in "International Journal of Mineral Processing in 1990"

TL;DR: In this article, the authors put together the available basic knowledge relevant to the problem of very fine particles and analyzed the various surface-based methods for very fine particle particle detection and analysis.

TL;DR: The adsorption of ethyl xanthate on pyrite, pyrrhotite, chalcopyrite and sphalerite has been studied using FTIR-ATR techniques and microflotation as discussed by the authors.

TL;DR: In this article, the effects of physical, chemical and geometrical variables on shear-flocculation and carrier flotation are discussed, based on a detailed literature review.

TL;DR: In this paper, a method for measuring bubble sizes in a laboratory column cell for two-and three-phase systems is described, where an increase in viscosity, solid-particle size, pulp density and air flow rate and a decrease in temperature all resulted in larger bubbles.

TL;DR: In this article, the mechanism of oleate interaction on apatite through adsorption and electrokinetic studies was investigated through the analysis of electrokinetics data, and it was shown that the adsorbing density at monolayer coverage corresponds to a condensed state of surfactant molecule with a molecular area of 33 A 2.

TL;DR: In this paper, the free energy of formation of copper ethyl xanthate relative to Xanthate ions was determined from rest potential measurements of a copper electrode in xanthates solutions.

TL;DR: In this article, the authors studied the flotation of a copper and a lead-zinc sulphide ore from Mt. Isa in the absence and presence of specific collectors and depressants over a range of grinding and flotation Eh conditions.

TL;DR: In this paper, floatability and surface characteristics of sphalerite in the presence of different concentrations of copper sulphate and K-ethylxanthate, for various times of activation and collection, were studied.

TL;DR: In this article, a review of previously reported work on this process has shown, in contradiction to the claim of Page and Hazell, that oxygen reduction is sufficiently rapid to support the anodic oxidation of xanthate to give rise to monolayer coverage at time scales well within the range relevant to flotation.

TL;DR: In this article, the authors studied the thermal decomposition of Indian siderite samples in the presence of air using both isothermal and nonisothermal techniques and showed that the kinetics of the reaction followed the Avrami-Erofee'v model.

TL;DR: In this article, two linear models are proposed for the simulation of flotation plants by use of linear programming, one linear model produces the circuit structure, as well as the optimal flow rates of the valuable element in the concentrate.

TL;DR: In this paper, the effect of galvanic interactions among sulphide minerals such as chalcopyrite, galena and sphalerite in the presence and absence of a hyper steel ball material on the flotation recovery of sphalite and galena has been studied.

TL;DR: In this paper, the effects of sodium sulfide solutions at pH 9.2 on fresh fracture and oxidized fracture surfaces of chalcopyrite and pyrite have been investigated by X-ray photoelectron spectroscopy.

TL;DR: In this paper, the effect of polymeric dispersant aids on the grinding of dense slurries has been studied and a multi-torque mill model has been derived which tracks the overall mill torque as a function of changing viscosity of the pulp, permits estimation of the charge split between cascading and cataracting-centrifuging regimes and explains the occurrence of a peak torque value at some intermediate stage.

TL;DR: In this article, the reactions involved in the adsorption-abstraction of K-amylxanthate on finely ground galena and pyrite were investigated.

TL;DR: In this article, a two-stage adsorption process was discovered for amylxanthate at pH 11.0 and 12.5 in a laboratory stainless steel rod mill in basic conditions.

TL;DR: Adsorption of xanthates on galena, pyrite and sphalerite is presented as a function of oxygen concentration and pH in this article, where various mechanisms for xanthate adsorption are suggested.

TL;DR: In this paper, a new method for determining ϵ ∗ complex permittivity of sphalerite pulp is proposed to follow (in situ) the activation and deactivation processes by metallic ions (Cu2+, Ag+, Hg2+).

TL;DR: In this article, the same structural features used in the development of circuit analysis are employed here with the addition that a formal probabilistic interpretation is given to the unit partition coefficients.

TL;DR: In this article, the problem of froth flotation kinetics is treated as a transport phenomenon and two coupled equations of balance are formulated which concern the particles attached upon the bubbles and the free particles in the pulp.

TL;DR: In this paper, the new collector oleoylsarcosine is used in the flotation of fluorite from ores containing more than 6% calcite (acid-grade concentrates cannot be produced from these ores with oleic acid).

TL;DR: In this paper, the effect of the nature and size of the raw phosphate particles as well as acetic acid concentration, liquid/solid ratio (vol/wt basis) and reaction time have been studied.

TL;DR: In this paper, a process employing bio-leaching was developed and tested for the recovery of precious metals from complex sulfide ores and tailings, where the precious metals were associated with the sulfide minerals, a bulk sulfide flotation concentrate was produced and then subjected to bioleaching using Thiobacillus ferrooxidans, before final treatment of residues by cyanidation to extract the gold and silver.

TL;DR: Adsorption of xanthates on galena, pyrite and sphalerite in the virtual absence of oxygen is presented as a function of the xanthate concentration and pH.

TL;DR: More than sixty size distributions resulting from the breakage of single particles of four minerals in rigidly mounted rolls with different combinations of feed size and roll gap have been analyzed in great detail as to their shape, structure and the effect of energy consumption as mentioned in this paper.

TL;DR: In this article, a new experimental procedure has been developed to measure the strength based on the extent of breakage of agglomerates repeatedly dropped from a predetermined height, combined with impact and breakage theories.

TL;DR: In this paper, the percentage of oxygen saturation and how it changed with the point of sampling in the circuit and with time, were able to approximate the corresponding laboratory oxygenation time needed to carry out batch testing comparable with what could be done in a continuous operation.

TL;DR: In this paper, the binary adsorption of gold cyanide and zinc cyanide onto a strong-base anion exchange resin was studied, and the empirical Fritz and Schluender (1974) binary isotherm was found to fit the experimentally measured equilibrium data well.

TL;DR: In this article, the equilibrium distributions of Cu, S, O and minor elements between silica-saturated fayalite slag, copper matte (44 to 79.5% Cu) and copper have been examined experimentally under controlled partial pressures of SO 2, S 2 and O 2.