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Wyszukujesz frazę "Glass, J." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Odezwa Konsystorza Ewangelicko-Augsburskiego "Do braci ewangelików" z apelem o aktywny udział w obronie kraju : Warszawa, 12 lipiec 1920
    Autorzy:
    Glass, J.
    Bursche, J.
    Powiązania:
    Zwycięstwo 1920 : Warszawa wobec agresji bolszewickiej Paris, 1990 S. 72-73
    Współwytwórcy:
    Drozdowski, Marian Marek (1932- ). Opracowanie
    Eychhorn - Szwankowska, Hanna. Opracowanie
    Wiechowski, Jerzy. Opracowanie
    Data publikacji:
    1990
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Mineral preconcentration using near infrared sensor-based sorting
    Autorzy:
    Iyakwari, S.
    Glass, H. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/109720.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    near infrared
    copper
    hematite
    preconcentration
    strategy
    intimate mixtures
    moisture
    Opis:
    This paper predicts qualitatively and quantitatively the near infrared activity of individual minerals in simple and complex mineral associations using mixtures of common alteration minerals found in a copper ore. It was found that spectra dominance in most cases is dependent on any or combination of mineral composition, relative proportion or concentration and/or mineral accessibility or sensitivity to near infrared radiation. The analysis of results also indicated that, in most cases, only freely occurring waste, such as clays (kaolinite and/or muscovite) and calcite, can be targeted for discrimination. In this paper, a strategy for the application of near infrared for preconcentration of copper bearing minerals like chrysocolla and malachite from coarse ore particles was proposed. Other applications also considered in this paper include preconcentration of hematite from associated clays and carbonate waste, and the determination of moisture content in kaolinitic clays.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 661-674
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sequencing of ore columns for planning of large underground mines
    Autorzy:
    Glass, Hylke J.
    Van Hout, Gert
    Powiązania:
    https://bibliotekanauki.pl/articles/89175.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    block caving
    sequencing
    drawpoint
    optimisation
    net present value
    Opis:
    Block caving is an underground mining technique which extracts ore from the base, rather than from the top, of typically massive deposits. Mining infrastructure is developed below the deposit before extraction commences. A network of tunnels provides access to a collection of drawpoints from which ore is mucked and hauled. With large deposits, not all drawpoints are developed simultaneously and the opening of drawpoints is sequenced to facilitate orderly extraction of ore columns above drawpoints. Sequencing fixes the initiation point for the entire block cave, or a part of it, as well as identifying the direction of cave advancement. The sequence of opening drawpoints influences the mine economics and is an integral aspect of planning a block cave mine. This paper discusses the optimisation of sequencing based on the net present value associated with extraction over the life-of-mine. It is shown that the maximum attainable net present value is obtained by a sequence in which ore columns are ranked in descending order of value. If significant variation of grade is present inside columns, an iterative procedure is given which corrects the sequence which yields the maximum net present value. The sequence with maximum net present value may not be practical or attractive from a caving perspective. Systematic design of sequences which permit orderly development of a block cave is discussed. To provide context, the net present value obtained from these feasible sequences is compared with the maximum attainable net present value. It is shown that the best feasible sequences in terms of net present value are preferentially initiated in zones with columns of high-grade ore.
    Źródło:
    Mining Science; 2019, 26; 157-171
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective leaching of copper from near infrared sensor-based preconcentrated copper ores
    Autorzy:
    Ambo, Amos Idzi
    Iyakwari, Shekwonyadu
    Glass, Hylke J
    Powiązania:
    https://bibliotekanauki.pl/articles/1449474.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    near infrared
    leaching
    pre-concentration
    ore characterization
    copper
    Opis:
    Copper oxide ore was pre-concentrated using near infrared sensor-based method and classified as product, middling and waste. The product and middling fractions were leached with ammonium chloride reagent. The effect of temperature, ammonium chloride concentration, solid- liquid ratio, stirring speed and particle size experimental variables were investigated. Mineralogical and chemical analysis of the ore fractions indicated that copper content was in accordance with the preconcentration strategy, with the product having a higher concentration than the middling and waste. The rate of copper extraction was found to be higher in the product than in the middling sample which further supports the near infrared classification, QEMSCAN®, X-ray diffraction, SEM mineralogical and X-ray florescence and Inductively coupled plasma Mass spectrometry chemical data. It was revealed that the leaching rate increases with increasing ammonium chloride concentration, temperature and decreasing ore particle size, stirring speed and solid-liquid ratio. Analysis of the experimental data by shrinking core model indicated that the dissolution kinetics follow the heterogeneous reaction model for the chemical control mechanism where the activation energies of 45.9 kJ/mol and 47.5 kJ/mol for product and middling fractions respectively were obtained. Characterization of the residue obtained at optimum leaching condition with X-ray diffraction suggests that copper was selectively leached when compared to the profile of the raw ore. The trace levels of metals associated with abundant X-ray diffraction profiles of residue found in the leachate further confirm the selective leaching process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 204-218
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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