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Showing 1 to 20 of 71 for “"Sphalerite"”.
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The collectorless flotation of sphalerite
The flotation of sphalerite has been demonstrated without the use of collectors. The effect of redox potential, pH, and copper-activation have been investigated in tests using samples of pure mineral. It has been found that in general, collectorless flotation of sphalerite can be accomplished at …
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Geology and Geochemistry of Sphalerite in Coal
… and Forest City Basins contain epigenetic sphalerite and associated minerals in veins, clastic dikes, collapse structures, and other small-scale structural features. The mineral assemblage in the sphalerite veins consists of silicates, sulfides, and carbonates. The paragenesis is …
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Collectorless flotation of chalcopyrite and sphalerite ores
The flotation of chalcopyrite and sphalerite has been accomplished without the use of collectors. Of the six chalcopyrite ores tested in the present work, some floated well using only a frother, while others required the addition of sodium sulfide, presumably to remove the hydrophilic surface …
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Electrochemical Studies of Copper-Activation of Sphalerite and Pyrite
… the subsequent xanthate adsorption on insulating sphalerite. Fabricating CMC electrode involves embedding sphalerite particles in carbon to form a carbon matrix composite; and SC electrode is designed by contacting a platinum wire to the sphalerite surface. When these electrodes are activated by …
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Investigation of pyrite and sphalerite flotattion with potassium amyl and ethyl xanthate, An
Includes bibliographical references (pages 78-80).
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The rates of oxidation of galena and sphalerite in acidic ferric chloride solutions
… to determine the oxidation rates of galena and sphalerite under conditions similar to that expected in a weathering ore deposit . The specific surface area of the run solids was determined by N₂ BET procedure and the surface textures observed by SEM. The amount of Fe³⁺ converted to Fe²⁺ by the …
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Kinetics of the ferric sulphate leaching of sphalerite and sphalerite/pyrite mixtures : a study of the chemical leaching of base metal minerals under conditions similar to that of bio-leaching by thiobacilli
… of-the ferric leaching of zinc from sphalerite. A further aspect of this study was an investigation of the influence of pyrite on the dissolution rate of sphalerite due to possible galvanic interactions. This study is one component of a larger study of the sub-processes involved in …
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A reconnaissance investigation of chalcopyrite-sphalerite relationships in the Cu-Fe-Zn-S system
… pyrite, bornite, chalcopyrite, cubanite, and sphalerite. Chalcopyrite-sphalerite relationships were emphasized because of their common association as intimately intergrown phases (interpreted as exsolution or replacement) in major Cu-Zn ore bodies. The investigation employed silica tube-type …
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Geology, paragenesis, and geochemistry of sphalerite mineralization at the Young mine, Mascot-Jefferson City zinc district, East Tennessee
… the major source of zinc in the United States. Sphalerite mineralization which occurs as a breccia infilling in the Lower Ordovician Knox Group carbonates has been studied in detail at the Young Mine, located in the central portion of the district. The sphalerite occurs as fracture fillings and …
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Trace element distributions and partitioning trends in hydrothermal base metal sulphide ores comprising sphalerite, galena, chalcopyrite and tetrahedrite-tennantite
… elements that can be incorporated into natural sphalerite, galena, chalcopyrite and tetrahedrite-tennantite are determined, as are the preferred equilibrium trace element partitioning trends among these sulphides. The previously documented coupled substitution Ag⁺+(Bi, Sb)³⁺↔2Pb²⁺ in galena is …
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Direct oxidative Ammonia-Ammonium salt leaching of sphalerite concentrate from the Gamsberg Mine and study of the catalytic effect of Cu(II) on Zinc extraction
… to selectively leach Zn over Fe from Gamsberg sphalerite flotation concentrate under moderate temperatures and atmospheric pressure was investigated in stirred tank reactors. This approach is suggested as an alternative primary method for extracting Zn from sphalerite concentrates that are not …
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Inorganic and organic geochemistry of the zinc ores of the Idol Mine, East Tennessee
… formations. The paragenesis study reveals that sphalerite, the only zinc mineral, precipitated at the earliest stage of ore formation accompanied by minor amounts of dolomite and marcasite. A major stage of coarse white dolomite precipitation took place after sphalerite. Minor amounts of other …
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Pyrite porphyroblast paragenesis at the Cherokee Mine, Ducktown, Tennessee
… porphyroblasts contain abundant inclusions of sphalerite, calcite, and micas that are used to determine the paragenesis of the porphyroblasts and the metamorphic history of the ore deposit. The ore mineralogy at the mine is: hexagonal pyrrhotite (60%), pyrite (30%), chalcopyrite (4%), …
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A techno-economic comparison of three process routes for the treatment of Gamsberg zinc ore
… is an abundant availability of zinc sulphide (sphalerite) ore (160 million tons at 7.40 % Zn) at Gamsberg, Northern Cape in South Africa. The ore body is South Africa’s greatest unexploited base metal resource. Regardless of its size, the low zinc and high manganese content of the sphalerite …
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Sediment-hosted Zn-Pb-Ag (+ Cu) deposits in the Mount Isa region: An epigenetic approach to mineralisation
… Mount Isa deposit suggests that chalcopyrite, sphalerite, and galena are texturally coeval. Furthermore, the variation in trace element geochemistry of sphalerite, galena, and chalcopyrite across the Cu to Zn-Pb-Ag transition suggests that the separation of Cu and Zn-Pb-Ag mineralisation likely …
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Bioleaching and electrobioleaching of sulfide minerals
Chalcopyrite, sphalerite, and pyrite, were leached using a bioleaching mode and an electrobioleaching 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 …
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Hydrophobic Forces in Flotation
… mineral systems studied include covellite (CuS), sphalerite (ZnS) and hornblende (Ca₂(Mg, Fe)₅(Si₈O₂₂)(OH,F)₂). The collector used for all the mineral systems studied was potassium ethyl xanthate (KEX). For the covellite-xanthate system, a biopotentiostat was used in conjunction with the AFM to …
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The integration of petrologic and isotopic data from the Boulder Conglomerate to determine the age of the Navan orebody, Ireland
… is replaced by pyrite and paragenetically later sphalerite and galena. The isotopic range of 34S for pyrite (-32‰ to -35‰) is distinct from that of the zinc and lead sulphides (-18‰ to +6‰). The uppermost Boulder Conglomerate is characterised by slumped and brecciated mineralisation which is …
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The effect of ball mill operating parameters on mineral liberation
… Tennessee. It was a binary ore consisting of sphalerite and dolomite. Batch grinding experiments were conducted to provide breakage rates for the various composition classes. Breakage rates were then normalized with respect to energy to see if the changes in breakage rates associated with mill …
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Effect of VRM on a polymetallic sulfide ore and the flotation response as compared to conventional wet and dry rod milling
… chalcopyrite (1.3 %), galena (2.4 %) and sphalerite (1.8 %) as the main value minerals and magnetite (68.0 %) and quartz (15.7 %) as dominant gangue minerals was used for the study. The ore was milled to target grinds of 55 %, 60 %, 65 %, 70 % and 75 % passing 75 µm respectively, at a …
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