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    Wyświetlanie 1-2 z 2
    Tytuł:
    Mathematical and Physical Modeling of Alloy Behavior Feeding by Pulse-Step Method to Liquid Steel in One Strand Slab Tundish
    Autorzy:
    Cwudziński, A.
    Gajda, B.
    Hutny, A.
    Jowsa, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353009.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tundish
    pulse-step alloying method
    liquid steel
    physical trials
    numerical modeling
    Opis:
    The main purpose of the present work was to validate the numerical model for the pulse-step liquid steel alloying method using a physical simulator that enables the observation and recording of phenomena occurring during the continuous steel casting process. The facility under investigation was a single-nozzle tundish equipped with a dam. To physical trials the glass water model was made on a scale of 2:5. For the mathematical description of turbulence during liquid steel alloying process, the k-ε and k-ω models were employed in the simulations. Based on the computer simulations and physical trials carried out, alloy addition behaviour and mixing curves for different tundish alloy addition feeding positions were obtained. The change in the location of alloy addition feeding to the liquid steel had an effect on the process of alloy addition spread in the liquid steel bulk and on the mixing time.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 2081-2087
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of H2O2 and O3 on PGM Extraction from Used Car Catalysts
    Autorzy:
    Fornalczyk, A.
    Willner, J.
    Gajda, B.
    Sedlakova-Kadukova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/356376.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent catalytic converters
    PGM metals
    hydrometallurgy
    O3
    H2O2
    Opis:
    Catalytic converters contain the catalytic substance in their structure, which is a mixture of Platinum Group Metals (PGMs). The prices of these metals and a growing demand for them in the market, make it necessary to recycle spent catalytic converters and recovery of PGMs. In the study, the effect of ozone and hydrogen peroxide application on the possibility of extracting PGM from used car catalysts was investigated. The catalytic carrier was milled, sieved and then the fractions with the desired grain size were treated with the appropriate HCl mixture and 3%, 5%, 10%, 15% and 30% H2O2, respectively, and the tests were also carried out at temperature 333 K. Ozone tests were conducted with the O3 flow in the range of 1,3,5 g/h. Samples for analysis were collected after 30 min, 1 h, 2 h, 3 h and after 4 h, respectively. The residue after the experiments and filtration process was also analysed. The obtained results confirmed the assumption that PGMs can be extracted using hydrochloric acid with the addition of H2O2 or ozone as oxidants. It allows to significantly intensify the carried out reactions and to improve the rate of PGMs transfer to the solution.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 963-968
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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