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    Wyświetlanie 1-2 z 2
    Tytuł:
    Comparison of chemical and biological leaching of sulfide tailings
    Autorzy:
    Aromaa, J.
    Makinen, J.
    Vepsalainen, H.
    Kaartinen, T.
    Wahlstrom, M.
    Forsen, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/110381.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sulfide tailings
    chemical leaching
    bioleaching
    selectivity
    Opis:
    Sulphidic tailings from Finnish Hitura nickel mine and Pyhäsalmi multi-metal mine were leached using sulphuric acid and bioleached. The aim was to recover minor amounts of valuable Cu, Ni, Zn and Mn. Both tailings consisted mainly of iron and magnesium-containing minerals and acid neutralizing minerals. The solution after chemical leaching tests contained mostly iron and magnesium, in Hitura up to 11 g/dm3 Fe and 38 g/dm3 Mg while in Pyhäsalmi 8–9 g/dm3 Fe and 4 g/dm3 Mg. Amount of these metals was 20–100-fold larger than amount of valuable metals, which were typically 100-300 mg/dm3. Problems in chemical leaching were high consumption of acid and poor selectivity. Bioleaching using iron and sulphur oxidizing bacteria was more selective towards the valuable metals. Both in leaching and bioleaching the high concentration of iron and magnesium in solution will make metals recovery challenging.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 607-620
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of laser and clock stability and meteorological conditions on gravity surveyed with the A10 free-fall gravimeter - first results
    Autorzy:
    Sekowski, M.
    Krynski, J.
    Dykowski, P.
    Mäkinen, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/224651.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    gravimetric survey
    absolute gravimeter
    metrological parameters
    metrology
    badania grawimetryczne
    parametry metrologiczne
    metrologia
    Opis:
    The Institute of Geodesy and Cartography in Warsaw, Poland, operates the A10-020 free-fall portable gravimeter since November 2008. Numerous gravity measurements with the A10-020 gravimeter, conducted under both laboratory and field conditions, provide a unique material for the estimation of accuracy as well as reliability of the determined gravity. Time series of regular, monthly measurements conducted with the A10-020 at the Borowa Gora Geodetic-Geophysical Observatory for over two years at two laboratory test sites and one field station has been analysed in terms of their internal consistency and compliance with the previous measurements performed with a few other absolute gravimeters (mainly FG5). The results of a number of calibrations of both, the rubidium oscillator and the polarization-stabilized laser interferometer of the A10-020 were considered in the analysis. The effect of applying the frequency standard as well as laser interferometer calibration data on the quality of gravity determined was investigated. In addition, the impact of weather conditions as well as variability of metrological parameters on surveyed gravity was taken into consideration when evaluating accuracy and reliability of gravity survey with the A10 gravimeter. Also the possibility of the occurrence of gross errors in gravity determination with the A10 gravimeter was discussed.
    Źródło:
    Reports on Geodesy; 2012, z. 1/92; 47-59
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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