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    Wyświetlanie 1-2 z 2
    Tytuł:
    Considering the influence of calcium on EAF dust acid leaching
    Autorzy:
    Havlik, Tomas
    Miskufova, Andrea
    Turek, Peter
    Urban Kobialkova, Ivana
    Powiązania:
    https://bibliotekanauki.pl/articles/110605.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    EAF-dust
    leaching
    sulphuric acid
    industrial waste
    zinc
    iron
    calcium
    hydrometallurgy
    Opis:
    This work focuses on the hydrometallurgical processing of EAF steelmaking dust in laboratory conditions. The behavior of calcium under the influence of sulphuric acid as the leaching agent is discussed. Due to calcium presence the acid is continuously consumed, gradually leaching the calcium phase from EAF dust as well as other zinc- and iron-containing phases. A thorough composition analysis of the input sample of EAF dust was performed. A kinetic study of calcium showed that its leaching is a very fast process, but most of the calcium reacting with sulphuric acid is precipitated from the solution in the form of CaSO4∙2H2O. This causes greater sulphuric acid consumption, and therefore it is necessary to study the calcium behavior during processing of EAF dust. This work is narrowed with calcium behavior during leaching of EAF dust in sulphuric acid and effect of calcium to extraction other metals into solution.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 2; 528-536
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From waste to treat waste : exploitation of marble dust as a harmful pollutant to a green adsorbent for dyes and heavy metals from industrial wastewater
    Autorzy:
    Attia, H.A.
    Farghaly, Mohamed G.
    Saleh, A.M.
    Abdel Khalek, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175448.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    marble dust
    pollutant
    adsorbent
    dye
    heavy metals
    textile wastewater
    Opis:
    The marble dust as a harmful industrial waste of marble fabrication was evaluated as aneconomical and efficient green adsorbent for Acid Red-1 dye and lead ions. The XRD, XRF, particle size, surface area and zeta-potential measurements were used to characterize the marble dust. The removal efficiency was optimized by studying several parameters such as pH, temperature, contact time, adsorbent dose and initial concentration. The optimum removal was achieved at pH 6, 20°C after 60 min in the presence of 2.5g/L marble dust. The rates of adsorption were found to follow the pseudo-second-order model. The results showed better fitting to Freundlich isotherm. The thermodynamic studies revealed that the adsorption process is spontaneous, exothermic and favorable at low temperature. The free energy (∆G°), enthalpy (∆H°), and entropy (∆S°) changes were calculated to predict the nature of adsorption.The removal efficiency was improved by calcination of the marble at 700°C. Application for textilewastewater showed high removal efficiency up to 99.9%of inorganic and organic pollutants. The product of treatment was used in the concrete and bricks manufactured, so there is nogeneration of second-order pollutants.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 154007
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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