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    Wyświetlanie 1-3 z 3
    Tytuł:
    Precipitated calcium carbonate production, synthesis and properties
    Autorzy:
    Erdogan, N.
    Eken, H. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/110023.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    precipitated calcium carbonate
    waste marble powder
    whiteness
    Opis:
    Calcium carbonate (CaCO3) is the most widely used filler material in paper, paint, plastic, food, ceramic, cosmetic, medicine and other industries. In the present paper, precipitated calcium carbonate (PCC) has been produced from waste marble powder (WMP) by the Calcination-Dissolution-Precipitation (CDP) method. Calcination, dissolution and precipitation experiments were carried out under various conditions including : calcination temperature (800, 850, 900, 950 and 1000 °C), dissolution time (2.5, 5.0, 7.5 and 10.0 min) and precipitation time (2.5, 5.0, 7.5, 10.0, 12.5 and 15.0 min). Then, XRF, XRD, SEM, particle size, whiteness, brightness and yellowness analyses were performed for the characterization of the produced PCC materials. The analyses showed that the precipitate was mainly micrometer-sized (d50 = 1.682 μm) rhombohedral calcium carbonate crystals with 54.5% CaO. The whiteness, brightness and yellowness tests of the precipitates, conducted by Datacolor Elrepho 450x spectrometer, were determined to be 91.28, 98.2 and 1.99%, respectively. It was finally concluded that the produced PCC material reasonably meets Turkish Standards (TS 11653/1995) and can be used in paper industry.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 1; 57-68
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of high quality magnesium chloride from recycled waste magnesite powder
    Autorzy:
    Erdogan, N.
    Yersel, E.
    Celebi, C.
    Kavakli, N.
    Batar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110185.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    waste magnesite powder
    leaching hydrochloride acid
    magnesium chloride
    MgCl2
    Opis:
    This study investigates the production of high-quality MgCl2 from recycled waste magnesite powder with an average particle size of d50 0.079 mm using the HCl acid leaching method. The experimental parameters were, leaching temperature, leaching time, amount of the acid, liquid-to-solid ratio, scale-up factor, acid concentration, particle size and mixing speed. The experiments were performed under reproducible conditions. The results showed that optimum leaching parameters were: temperature of 70 °C, 180 min leaching time, 130 cm3 acid consumption, 3.6 cm3/g liquid-to-solid ratio, scale-up factor of 1, 10.17 M acid concentration, 0.079 mm average particle size and a mixing speed 60 rpm. Under these optimum conditions, the leaching yield was 96.72%. The produced MgCl2 solution contained 0.04% SiO2, 0.36% CaO, 0% Fe2O3, 0% Al2O3, 46.73% MgCl2, 52.87% L.O.I. and 99.60% MgCl2+L.O.I. (= MgCl2·6H2O). These results indicated that high-quality magnesium chloride can be produced from waste magnesite powder.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 557-566
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Behavior of a Clayey Sand Reinforced with Polypropylene Fiber
    Autorzy:
    Bozyigit, I.
    Tanrinian, N.
    Karakan, E.
    Sezer, A.
    Erdoğan, D.
    Altun, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031269.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.70.Bt
    83.80.Fg
    Opis:
    It is a well-identified fact that more elaborate laboratory studies should be carried out for evaluation of dynamic properties of different types of soils. Regardless of the mechanisms affecting the mechanical behaviour of the soils, past studies reveal that existence of fiber positively affects the strength of either cohesive or non-cohesive soils. A short literature survey provides numerous studies on the stress-strain behaviour of fine/coarse soils, reinforced by polypropylene fiber. On the other hand, studies concerning fiber reinforced soils subjected to dynamic loading are relatively rare. Therefore, in this research it was intended to investigate the effects of polypropylene fiber inclusion on the dynamic behavior of a clayey sand soil, within an experimental framework. In this scope, a number of cyclic triaxial compression tests were conducted to assess the effect of fiber presence. The effects of fiber length and content were experimentally evaluated. Hence, the variation of shear modulus ratio and damping ratio values by shear deformation was plotted to observe the effects of fiber length and inclusion level as well. The results are presented along with detailed evaluations.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 674-678
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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