Showing papers on "Mineral processing published in 1988"
Journal Article•
TL;DR: The main causes of refractoriness of some metallurgically complex gold ores in South Africa are related to the presence of submicroscopic gold, carbonaceous material, pyrrhotite, and base-metal sulphides as discussed by the authors.
Abstract: A mineralogical investigation of the main causes of refractoriness of some metallurgically complex gold ores in South Africa is reported. It is shown that this refractoriness is related to the presence of submicroscopic gold, carbonaceous material, pyrrhotite, and base-metal sulphides. Gold ores can be classified according to their content of these components. Electron-microprobe analysis shows that gold occurs in arsenopyrite and pyrite, the gold contents of which can be up to 2700 g/t. The gold and arsenic contents of these minerals are closely correlated. Furthermore, within zoned arsenopyrite grains, the concentration of gold closely follows that of arsenic. Mossbauer spectroscopy carried out on samples of concentrate from the Barberton area indicates that the submicroscopic gold within the sulphides is in a non-metallic form. The mineralogical examination of beneficiation products is important, since it sheds light on some fundamental aspects of the behaviour of the ore and gangue components during milling and flotation. Such basic information will lead ultimately to a better understanding of the problems in the beneficiation of these ores. Investigations have shown that the overmilling of the auriferous arsenopyrite and the disseminated nature of the sulphide mineralization are the main problems during beneficiation.
32 citations
01 May 1988
TL;DR: A brief review of the work carried out in this area is presented in this article, where some of the salient features of mineral flotation and flocculation with chelating-type reagents, such as bulk vs. surface chelation, the role of pH, mineral solubility, solution chemistry of reagents and temperature, are illustrated with appropriate examples.
Abstract: Chelating agents, because of their metal specificity, can function as effective mineral processing reagents. A brief review of the work carried out in this area is presented. Some of the salient features of mineral flotation and flocculation with chelating-type reagents, such as bulk vs. surface chelation, the role of pH, mineral solubility, solution chemistry of reagents, and temperature, are illustrated with appropriate examples. The problems associated with the commercialization of chelating reagents for ore beneficiation and the research efforts required in this area are also discussed.
21 citations
12 citations
01 Jan 1988
TL;DR: In this article, a study of particle entrainment in flotation with different frothers was conducted in the case of copper ore, where the case was investigated with different types of frother.
Abstract: A study of particle entrainment in flotation with different frothers : the case of copper ore
10 citations
TL;DR: Uranium is the basic raw material for a nuclear energy program as discussed by the authors and it is processed in India by the well-known method of sulphuric acid, ion exchange concentration and its final precipitation as magnesium diuranate.
Abstract: Uranium is the basic raw material for a nuclear energy programme. Uranium ore is processed in India by the well-known method of sulphuric acid, ion-exchange concentration and its final precipitation as magnesium diuranate—‘yellow cake’. We have established a process for uranium recovery from the tailings of copper concentrators which also enables recovery of small amounts of copper, nickel and molybdenum present in the uranium ore. Another major activity of this centre has been the exploitation of mineral-rich beach sands to produce ilmenite, rutile, zircon and monazite. Downstream industries have also been established for chemical processing of these minerals. Production of niobium from low-grade ores and beryllium from beryl ore is also being carried out on a moderate scale.
4 citations
TL;DR: In this article, the authors examined the geology of a hydrothermal tin-sulphide mine with particular reference to the nature and associations of the ore minerals and attempts to predict mineralogical controls to mineral processing.
4 citations
TL;DR: In this paper, the authors present a review of recent developments in on-line nuclear gauges in coal and mineral processing operations, including the analysis of moisture in coke and sulphur in lead sinter feed and the bulk analysis of silver, lead and zinc in drill cores.
Abstract: Coal and mineral processing operations can be controlled more economically if information on process variables is obtained continuously. Much of this information can be provided by nuclear techniques. Recent Australian developments in on-line nuclear gauges are reviewed. Techniques have been developed, field tested and commercialised for the on-line analysis of ash and moisture in coal and for the in-stream determination of solids weight fraction and ash in coal slurries. Techniques are being developed for the on-line analysis of moisture in coke and sulphur in lead sinter feed. As well, techniques are being developed for the bulk analysis of silver, lead and zinc in drill cores.
4 citations