Yazar "Achimovicova, Marcela" seçeneğine göre listele

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    In-situ capturing carbon dioxide capture by mechanochemical of K-feldspar with calcium oxide
    (Polish Soc Ecological Engineering-Ptie, 2025) Achimovicova, Marcela; Tothova, Erika; Balaz, Matej; Zubrik, Anton; Briancin, Jaroslav; Balaz, Peter; Erdemoglu, Murat
    Capturing carbon dioxide (CO2) emissions is necessary for a multi-faceted approach to combating climate change. It is only one of several essential strategies, including reducing emissions at the source, enhancing natural carbon sinks such as minerals and rocks, and transitioning to renewable energy sources. This pioneering study used abundant and cheap K-feldspar mechanochemically modified with CaO for in situ CO2 sequestration during planetary ball milling. These innovative novel in situ CO2 capture experiments consisted of two simple steps. The first step involved the mechanochemical modification of K-feldspar using CaO and the subsequent second step, direct in situ CO2 sequestration in the same milling chamber during milling. X-ray diffraction patterns demonstrated the formation of the calcite phase, and elemental analysis confirmed the binding of approximately 1.69% carbon, representing a CO2 mineralization ratio of 6.05% after 60 min of milling with CO2 gas. Infrared spectroscopy, and thermogravimetric analysis equipped with mass spectroscopy verified CO2 mineralization of CaO-modified K-feldspar. The morphology of the product after CO2 capture containing calcite and unreacted K-feldspar was monitored by scanning electron microscopy.
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    Utilizing Taguchi method and in situ X-ray powder diffraction monitoring to determine the influence of mechanical activation conditions on the physico-chemical properties and Al leachability of K-feldspar
    (Elsevier, 2024) Balaz, Matej; Birinci, Mustafa; Senturk, Kader; Achimovicova, Marcela; Balaz, Peter; Tampubolon, Imelda Octa; Stolar, Tomislav
    K-feldspar represents an important natural resource of potassium and aluminum. Within the framework of this study, the K-feldspar was mechanically activated in a planetary ball mill under different conditions planned according to 4(3) Taguchi orthogonal array experimental design. As outputs, specific surface area (S-BET), median particle size (d(50)), amorphization degree of mineral phases , and Al recovery were used. It was found that the initial d(50) value of 293 mu m could be reduced to 6.7 mu m and the S-BET value of 4.7 m(2)/g could be increased up to 32.5 m(2)/g upon milling. Both microcline KAl3SiO8, and albite NaAl3SiO8 could be almost completely amorphized, whereas quartz SiO2 still maintained some crystallinity even under the most intensive conditions. Increasing S-BET and decreasing the d(50) values did not lead to a significant improvement in Al leach recovery, whereas a clear relationship between the amorphization of microcline and the recovered aluminum was found. Analysis of Variance (ANOVA) showed that increasing ball-to-powder ratio is the most beneficial for the improvement in Al recovery. In situ powder X-ray diffraction monitoring performed in an oscillation ball mill under synchrotron irradiation has shown very rapid amorphization of microcline phase at the beginning. However, amorphization of microcline was only partial after two hours of the treatment in this mill, apart from almost complete process in the planetary ball mill. In the end, regressions for the calculation of Al recovery by knowing the values of input parameters were calculated. In general, by just using mechanical activation without the subsequent roasting process that is commonly used to boost metal recoveries, it was possible to quantitatively recover aluminum from K-feldspar.