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    Wyświetlanie 1-3 z 3
    Tytuł:
    Impurity studies for the ITER half-field ICRF heating scenarios in hydrogen plasmas on JET
    Autorzy:
    Czarnecka, A.
    Lerche, E.
    Ongena, J.
    Van Eester, D.
    Figueiredo, A. C. A.
    Coffey, I. H.
    Zastrow, K. -D.
    Powiązania:
    https://bibliotekanauki.pl/articles/147692.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    tokamak
    impurities
    ICRF heating
    ITER scenario
    VUV plasma spectroscopy
    Opis:
    Two ion cyclotron range of frequencies (ICRF) heating scenarios, proposed for the non-activated half-B0 phase of ITER in hydrogen plasmas, were investigated on the JET tokamak. This paper we present a detailed study of the impurity content in plasma when the fundamental H and the 2nd harmonic 3He ICRF heating scenarios are realized. The ICRF conditions for those heating scenarios on ITER - i.e. the frequency of 42 MHz for the fundamental H and 53 MHz for the 2nd harmonic 3He heating, and the magnetic field B0 = 2.65 T – were closely reproduced in dedicated experiments on JET. The impurity content of the plasma was determined by means of the spectroscopy in the VUV range. The release of C and Ni impurities during the ICRF heating is presented as a function of the total ICRF heating power supplied in those heating scenarios. The contribution of the Ni impurity to the effective charge of the plasma, Zeff, and the plasma dilution are estimated. We find that for the 3He ICRF heating scenario the impurity content and the plasma energy loss through radiation was higher than for the fundamental hydrogen heating scenario.
    Źródło:
    Nukleonika; 2012, 57, 1; 25-30
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tailings reprocessing from Cabeco do Piao dam in Central Portugal: a kinetic approach of experimental data
    Autorzy:
    Figueiredo, J.
    Vila, M. C.
    Matos, K.
    Martins, D.
    Futuro, A.
    de Lurdes Dinis, M.
    Góis, J.
    Leite, A.
    Fiúza, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/92190.pdf
    Data publikacji:
    2018
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    tailings
    multi-criteria optimization
    reprocessing
    zinc
    tungsten
    odpadki
    optymalizacja wielokryterialna
    utylizacja
    cynk
    wolfram
    Opis:
    The mining waste and tailing dam are object of discussion due to the accidents that occur due to a lack of control or due to interest in the remaining minerals present in these materials. Most of the old tailings dams have high contents of heavy metals which could represent potential risks to the environment or be an alternative source of some critical raw materials. The case study of the Cabeco do Piao dam in Central Portugal involved tailings from a processing plant that belonged to the Panasqueira Mine Complex, which has been in operation for over 120 years. Waste rock and mining tailings were deposited in the area until 1995, and they represent an environmental liability for the local population due to their high content of toxic metals. Tailings reprocessing can be considered as a solution that minimizes social and environmental impacts, recovers some essential minerals, such as Zn, W, and Cu which can help to offset investments made. The project design involves several stages of metal concentration, determined by experiments, as well as a model of the process. The overall model will take into account technological constraints, social-economic conditions and environmental impacts. A preliminary result of an optimization study of the kinetic approach is presented in this piece of work.
    Źródło:
    Journal of Sustainable Mining; 2018, 17, 3; 139-144
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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