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Showing 1 to 20 of 102 for “"pyroxene"”.
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The role of complexing agents in the flotation of pentlandite-pyroxene mixtures
… the role complexing agents play in pentlandite-pyroxene flotation and focuses on the surface chemistry and interaction between valuable and gangue minerals as well as the interaction of complexing agents and reagents (xanthate, copper sulphate) in the system at pH 9. Microflotation, zeta …
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Pentlandite-pyroxene and pentlandite-feldspar interactions and their effect on separation by flotation
… to increase the separation of pentlandite from pyroxene and feldspar. The aim was to minimise the percentage pyroxene and feldspar reporting to the concentrate and simultaneously maximise the pentlandite recovery. The possible chemical reactions taking place on surfaces of synthetic pentlandite, …
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Distribution of olivine and pyroxene in S-type asteroids throughout the inner main belt
… this wavelength range are due to olivine and pyroxene, the two most abundant minerals in both chondritic and achondritic meteorites. The observed ratio of these two minerals is highly dependent on the amount of heating that an asteroid has undergone. The 1-micron band center wavelength and the …
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Studies of a scapolite-pyroxene-garnet gneiss from the Cascade Lakes, Keene, New York.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1966. B.S.
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Sr87/Sr86 ratios, K/Rb ratios, and rare-earth element abundances in pyroxene granulites.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1969.
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Variation in Iron Content of Pyroxene Amphibolite and Constituent Minerals at the Scott Mine, Sterling Lake, New York
Made available in DSpace on 2014-12-04T19:14:04Z (GMT). No. of bitstreams: 1 6104276.pdf: 2639546 bytes, checksum: 2ccea88a238d541392bcfab1d1058a96 (MD5) Previous issue date: 1961
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An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa
… are benign and stable over millions of years. Pyroxene-rich tailings generated from the processing of PGM ores in South Africa have the potential to sequester significant amounts of CO₂ (~14 Mt per annum). In the indirect pH swing method, silicate minerals are initially leached at low pH and …
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Poly(ethylenimine)-Functionalized Pyroxene Nanoparticles Embedded on Diatomite for Removal of Total Organic Carbon from Industrial Wastewater: Batch and Fixed-bed studies
… and effective poly(ethylenimine)-functionalized pyroxene nanoparticles to provide an efficient removal of the dissolved total organic carbon from industrial wastewater in batch and contenuious fixed-bed column studies under various conditions. Our study includes arrays of characterization …
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Formation conditions of plagioclase-bearing type I chondrules in CO chondrites : a study of natural samples and experimental analogs
… nebula. Chondrules typically contain olivine and pyroxene, a glassy mesostasis, Fe-Ni metal, and sulfides. Type I chondrules contain FeO-poor and volatile-poor mineral assemblages. Approximately 10% of type I chondrules, including type IA, IAB, and IB textures, also contain igneous plagioclase. …
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Heavy minerals of glacial sediments in the area of Red Lake Falls, Minnesota
… Most formations contain a hornblende-garnet-pyroxene-epidote assemblage; the Gervais Formation contains a pyroxene-hornblende assemblage. The mean proportion of the constituent minerals is different in each formation; however, there is overlap in the ranges of heavy mineral proportions among …
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Plagioclase preferred orientation in layered mylonites : evaluation of flow laws for the lower crust
… Deformation temperatures are constrained by two-pyroxene thermometry, stress is estimated from grain size, and deformation mechanisms are analyzed by microstructure and the presence or absence of a lattice preferred orientation (LPO). Our analyses indicate that mylonite layers deformed at a …
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Plagioclase preferred orientation in the layered mylonites : evaluation of flow laws for the lower crust
… Deformation temperatures are constrained by two-pyroxene thermometry, stress is estimated from grain size, and deformation mechanisms are analyzed by microstructure and the presence or absence of a lattice preferred orientation (LPO). Our analyses indicate that mylonite layers deformed at a …
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The petrogenesis and geochemistry of the dioritic complexes south of Balmoral forest, Angus
… consists of heterogeneous hornblende- and pyroxene-bearing diorites. Partially assimilated rafted metasedimentary xenoliths, are common in the intermediate rock types. The basic rocks are cumulates which display wall-parallel layering. Mineralogical variation displays a transition from …
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Correlation of Glacial sediments Using Heavy-Minerals Assemblages
… analysis. </p> <p>Both units contain hornblende, pyroxene, garnet, magnetite, and epidote, but in different proportions. The upper unit, the Huot Formation, has significantly more epidote and amphibole and less garnet and pyroxene than the Red Lake Falls Formation. It was found that these …
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Interpreting the 10um astronomical silicate feature
… Giirtler & Henning 1986) that the amorphous pyroxene content of initially olivine-rich interstellar dust increases with time. This is accompanied by an increase in the FWHM of the features which indicates an increase in grain size and/or an increasing fraction of chemically-varied crystalline …
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Geochemistry and mineralogy of selected Atlantic Ocean basalts
… plagioclase phyric basalts and plagioclase-pyroxene basalts from the olivine basalts. The NiO content of these phenocrysts in the former three basalt types is low, or a given Mg Mg+Fe²⁺ atomic ratio of the mineral, relative to the phenocrysts in the olivine basalts. Consideration of the …
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Compositional Analysis of the Martian Meteorites Northwest Africa 6342 and Northwest Africa 10961
… exhibit bimodal texture characterized by large pyroxene oikocrysts (poikilitic texture) surrounded by olivine-rich interstitial material (non-poikilitic texture) like other intermediate and enriched poikilitic shergottites. Chadacrysts are minerals that are fully enveloped within another …
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Investigation of the surface properties of gangue minerals in PGM bearing ores
… to be hydrophilic, such as chromite and pyroxene, report to the concentrate as floatable particles. Polysaccharide depressants, such as carboxymethyl cellulose (CMC) and modified guar gums are used to reduce the floatability of naturally floatable gangue and may also be able to reduce the …
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Elasticity of Mantle Minerals: Composition, Pressure and Temperature Dependence
… gradients in the transition zone is explained by pyroxene → majorite transition rather than adiabatic compression of minerals.
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Investigating the relative adsorption of polymeric depressants on pure minerals
… on pure minerals. The minerals used were talc, pyroxene, plagioclase, chromite and chalcopyrite and the depressants used were guar gum and carboxymethyl cellulose (CMC). It was hypothesised at the beginning of this study that polymeric depressants adsorb preferentially onto different minerals …
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