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Showing 1 to 20 of 45 for “"Sulfide minerals"”.
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Bioleaching and electrobioleaching of sulfide minerals
… mode. The former mode was used to teach the minerals with the bacterium A. ferrooxidans in a bioreactor. In the latter mode, the leaching of the minerals was performed in a combination of a bioreactor and an electrochemical cell. The idea is that an increase in Fe(II) concentration, which is …
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Electronics of sulfide minerals : implications for induced polarization
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
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Flotation of sulfide minerals with alkyl pyridinium salts
… the reduction in the negative ζ-potential of the sulfide mineral upon adsorption of cetyl pyridinium ions, which, in turn, minimizes the electrostatic component of the disjoining pressure of the wetting film. CpCl has also demonstrated a remarkable selectivity despite the fact that both …
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Fundamental studies of thionocarbamate interactions with sulfide minerals
… by CuFeS₂ and FeS₂. IBECTC adsorption on each sulfide mineral is relatively faster than IPETC, indicating the higher collecting power of IBECTC. The HSAB concept suggests that the interaction of thionocarbamates (soft bases) with sulfide minerals that are classified as soft acids should be …
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Microbial attachment to sulfide minerals in a bioleach environment
… ores with particular reference to the copper sulfide mineral chalcopyrite (CuFeS₂). While it is focused on heap bioleaching, it has applications to stirred tank bioleaching operations. Industrial heap bioleaching offers opportunities for processing of low grade ores but poses process …
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Laboratory Electrical DC Resistivity of Serpentinite, Graphite, Oxide and Sulfide Minerals
Radar remote sensing and Ground Penetrating Radar (GPR) are effective techniques for geological subsurface investigations. Planetary missions, such as Apollo-17 and Change-3, have used GPR as a tool for investigating the Earths moon surface. Electrical DC resistivity of chalcopyrite, galena, …
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Water quality effects on the bubble-particle attachment of sulfide minerals
… the plant water. Adsorption studies across all minerals showed that less xanthate adsorbs on the mineral surface as the ionic strength of the plant water increases; this indicates that the increase of inorganic electrolytes hindered xanthate adsorption on the mineral surface. Intuitively it is …
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The nature of the crystal structures of some sulfide minerals with substructures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1963.
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An evaluation of sulfidisation in the flotation recovery of heavily oxidised sulfide minerals : with particular reference to oxidised Merensky ores
Includes bibiographical references (p. 165-180).
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Oxygen and sulfur isotope fractionation by acidithiobacillus ferrooxidans during aerobic and anaerobic oxidation of copper sulfide minerals under simulated acid mine drainage conditions
Includes bibliographical references (pages 86-94).
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Kinetic Studies of Sulfide Mineral Oxidation and Xanthate Adsorption
Sulfide minerals are a major source of metals; however, certain sulfide minerals, such as pyrite and pyrrhotite, are less desirable. Froth flotation is a commonly used separation technique, which requires the use of several reagents to float and depress different sulfide minerals. Xanthate, a thiol …
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Depression of pyrite in polymetallic sulfide flotation using chitosan-grafted-polyacrylamide polymers
… of pyrite in the flotation of base metal sulfides. Fundamental studies of the adsorption behavior of Chi-g-PAM on model sulfide minerals indicated that Chi-g-PAM was more selective to pyrite’s surfaces as compared to base metal sulfides. Results suggested that the adsorption of Chi-g-PAM …
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Precombustion desulfurization of coal by photochemical methods and pyrite depression in froth flotation
… developed for separating clean coal from metal sulfide minerals such as pyrite and marcasite. The process comprises depressing the metal sulfide minerals with a reagent resulting from the alkaline oxidation and polymerization of a polyphenol or a quinone, and selectively floating clean coal from …
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Evaluation of potential acid mine drainage: A case study of the Albert Silver Mine, Mpumalanga Province, South Africa
… mining produces mine wastes that contain sulfide minerals that have potential to produce acid mine drainage. Albert Silver Mine conducted mining of the silver-sulfide bearing ore from 1885 to 1914. However, at the time, little attention was being given to acid mine water generation. This …
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Combining froth flotation and reflux classification to mitigate ARD generating potential of the Waterberg and Witbank coal ultrafines via sulfide removal
… have a high calorific value, and contain sulfur minerals, particularly pyrite. The high calorific value of these discards leads to a waste of energy that could be harnessed and used, while the high sulfur content contributes to adverse environmental effects such as acid rock drainage (ARD). The …
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The Effects of Contact Metamorphism by Diabase Intrusion on the Carbon and Sulfur Bearing Phases in the Siltstones of the Culpeper Basin
… rock, shown through the isotopic signatures of sulfide minerals with mantle compositions. The possible thermal break down of sedimentary pyrite is evidenced by highly negative isotopic composition of sulfide minerals and general lack of pyrite. I suggest that sedimentary pyrite initially reacted …
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Arsenic Release from Chlorine Promoted Oxidation of Pyrite in the St. Peter Sandstone Aquifer, Eastern Wisconsin
… The primary source of arsenic is As-bearing sulfide minerals within the aquifer. There is concern that periodic disinfection of wells by chlorination may facilitate arsenic release to groundwater by increasing the rate of sulfide mineral oxidation. Current guidance from the Wisconsin …
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Distribution of Platinum Group Elements in the New Afton Alkalic Cu-Au Porphyry Deposit, Kamloops, British Columbia
… Belt of the Canadian Cordillera. Bulk rock and sulfide minerals from New Afton contain potentially economic concentrations of platinum group elements (PGE). Primary PGE (Pd ± Pt) enrichment occurs within the main Cu-Au ore body and is spatially associated with the Cherry Creek monzonite. …
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The geochemistry of gold-bearing and gold-free pyrite and marcasite from the Getchell gold deposit, Humboldt County, Nevada
… correlation between As and Au in ore-stage Fe-sulfide minerals. High-resolution transmission electron microscopy analyses revealed that gold-bearing Fe-sulfide crystals are arsenic-rich marcasite, rather than pyrite. These analyses failed to identify gold as microinclusions in ore-stage …
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Environmental mineralogy of gold recovery from refractory gold-arsenic-bearing Bakyrchik concentrates
… occurs naturally by oxidation of exposed sulfide minerals. In the case of gold ores, the mining and beneficiation may also produce As-bearing wastes and this can accelerate the natural mechanisms of As mobilization. The Bakyrchik is the largest gold deposit in Kazakhstan and one of the …
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