Showing papers in "Minerals Engineering in 1992"

TL;DR: Water absorbent polymers as discussed by the authors have been used successfully within the Mineral Processing Industry to aid solid-liquid separation, with particular emphasis being placed upon the more recent innovations in terms of equipment and modifications, in the use of polyacrylamides, required to meet these new demands.

TL;DR: In this article, the authors investigated the flotation characteristics of a nickel sulphide transition ore with regard to two aspects, the recovery of magnesia bearing gangue, and the depression of the nickel sulphides by gaugue slime coatings.

TL;DR: In this article, the performance of plant flotation column froths was investigated, primarily as a function of radial distance and depth, and operating parameters such as gas rate and location of wash water pipes.

TL;DR: In this article, microflotation tests were performed on pure mineral systems involving calcite, apatite, quartz and hematite, and the results showed that all the minerals were depressed by the polysaccharides in the following decreasing depression order: tapioca starch (made up of approximately 17% amylose and 83% ammonium), amylopectin, amylopeectin and amylosophage, and Amylose, with a constant depressant concentration of 10 mg/l.

TL;DR: In this article, the principles of the use of a hydrophobic, highly negatively charged, bacterium, Mycobacterium phlei, as a flocculating agent for finely divided hematite suspensions and a flotation collector for hematites are investigated.

TL;DR: In this paper, the authors describe how sulphydryl collector chemistry affects the performance of base-metal sulphide flotation, particularly in terms of kinetics and selectivity.

TL;DR: In this article, the role of sodium sulphide in amine flotation of the silicate zinc minerals willemite and hemimorphite is discussed and the possibility of partial replacement of sodium sulfide by sodium hydroxide, with significant benefits in terms of reagnet costs and environmental impact.

TL;DR: The analysis of gold deportment with the diagnostic leaching technique has opened a research field to gain more insight into the fundamentals of the kinetic behaviour of gold dissolution from refractory ores as discussed by the authors.

TL;DR: In this paper, the importance of the work of Bagnold on particle-particle interactions in sheared flows has been highlighted, which has been widely cited in the gravity concentration literature.

TL;DR: In this article, a mathematical model that accounts for this phenomenon is proposed and compared for laboratory and industrial data, and possible mechanisms are discussed for cyclone underflow in both indoor and outdoor environments.

TL;DR: Diagnostic leaching is an analytical tool which was developed at the Anglo American Research Laboratories to examine the deportment of gold in ore or any type of plant product as discussed by the authors, which can be carried out on fairly representative samples and produces easily interpreted results.

TL;DR: An overview of reagent development in the past two decades is given in this article with emphasis on recent trends and applications, as well as an overview of the current state of the art.

TL;DR: In this article, the status of mineral processing models, and the simulator structures in which they are used are reviewed, with particular reference to those incorporated in the JKMRC Simulator, JKSimMet. and its derivatives.

TL;DR: In this paper, the specific rates of biooxidation of arsenopyrite and pyrite were found to be very similar at 0,15 d −1 or as mass rates, for both types of materials.

TL;DR: In this paper, the mean fluid velocity distribution was determined on two spirals having different metallurgical objectives by a stream sampling and simultaneous depth gauging technique, using data obtained from previously reported flow visualisation experiments giving the angle of deviation of the secondary current from the primary flow direction.

TL;DR: In this article, the presence of calcite tended to enhance coagulation and adsorption of heavy metals: neutralization of surface H+ ions by the calcite was considered responsible.

TL;DR: In this article, it was shown that only with SPA is it possible to obtain higher grade tin concentrates containing more than 40% Sn at high recoveries, and the basis for this is the named collector, a highly developed reagent system and a special flotation technology.

TL;DR: In this paper, the effect of mineral species of selected sulphide minerals namely, synthetic covellite, millerite and pyrrhotite was investigated using the electrokinetic technique.

TL;DR: Byron Knelson is the inventor of the centrifugal concentrator that bears his name as mentioned in this paper, which has virtually revolutionized gravity recovery and has been made in over 50 countries.

TL;DR: In this paper, the authors reviewed batch cell flotation models with respect to their suitability for genuine prediction of batch cell behaviour and found that single or double distributed first-order kinetics models yield an adequate prediction of the batch cell kinetics.

TL;DR: In this paper, the authors provide a structured and up-to-date review of the ion flotation subject, to examine some recent developments, and to indicate some potential applications of the technique.

TL;DR: In this paper, a solution chemistry study showed that acidized sodium silicate conditioning leads to preferential dissolution of calcite, which reduces collector adsorption on calcite and removes the floated calcite from the rougher concentrate.

TL;DR: In this paper, the effects of dichromate ion concentration, sulphuric acid concentration, temperature and the duration of the treatment on the stoichiometry of the reaction were examined.

TL;DR: The kinetics of reduction of manganese ore from Mamatwan mine in South Africa has been studied by thermogravimetric analysis (TGA), X-ray diffraction analysis (XRD), optical microscopy, Scanning Electron Microscopy (SEM) and energy dispersive analysis of X-rays (EDAX) between 1100° and 1350°C with graphite as the reductant under argon atmosphere.

TL;DR: This biooxidation and pore formation appears to be selective in the gold-rich regions with the consequence that only 50% sulphide oxidation is required for 90% gold liberation.

TL;DR: In this article, a mathematical model describing the flotation process is presented, which considers the bubble loading process to be analogous to interphase mass transfer, and the behavior of solid particles under flotation conditions is described using the sedimentation-convection model of Ityokumbul.

TL;DR: In this paper, the authors examined the effect of air and nitrogen on the selective leaching of zinc from EAF dusts that have been treated by a double-kiln fuming process.

TL;DR: In this article, the authors describe the continuation of the development of the reverse coal flotation process and compare the performance of reverse and forward flotation in a laboratory column cell using synthetic feed mixtures consisting of washed coal and quartz.

TL;DR: In this article, the authors observed the electrokinetic potential and surface adsorption phenomena of galena suggest a mode of action of Ca2+ and Ba2+ ions or metal hydroxides.