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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effects of Temperature on Fe and Ti in Carbothermic Reduction of Vanadium Titanomagnetite with adding MgO
    Autorzy:
    Li, Xiaohui
    Kou, Jue
    Sun, Tichang
    Wu, Shichao
    Zhao, Yongqiang
    Powiązania:
    https://bibliotekanauki.pl/articles/110204.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    VTM concentrate
    temperature
    carbothermic reduction
    Fe
    magnesium titanate
    Opis:
    Effects of temperature on Fe and Ti in carbothermic reduction of vanadium titanomagnetite (VTM) concentrate with adding MgO at 1100~1500℃ were investigated. It was found that most of Fe in the VTM concentrate existed in the form of magnetite and a small amount existed as ilmenite; Ti in the VTM concentrate was mainly present in the form of ilmenite. The temperature had significant effects on Fe and Ti: increasing temperature was beneficial to decrease the Fe content in the magnesium titanate mixture, and the Fe content could decrease to 5.47% at 1500℃. Thermodynamic analysis showed that FeTiO3 and MgO preferentially reacted to form Mg2TiO4, followed by MgTiO3 and MgTi2O5 when the temperature increased from 1100℃ to 1500℃. Results of X-ray diffraction and scanning electron microscopy-energy dispersive spectroscopy analyzes showed that an intermediate product of MgFe2O4 would formed at 1300~1400℃ in the actual experiment. This caused the Fe content in the magnesium titanate mixture to increase from 21.32% to 22.85% when the temperature increased from 1200℃ to 1400℃. In addition, the size of magnesium titanate particles could increase from a few microns to approximately 100 µm when the temperature increased from 1100℃ to 1500℃, which was conducive to realize the separation of metallic iron and magnesium titanate.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 4; 917-927
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The mechanism of $CaCO_3$ in the gas-based direct reduction of a high-phosphorus oolitic iron ore
    Autorzy:
    Wu, Shichao
    Li, Zhengyao
    Sun, Tichang
    Kou, Jue
    Xu, Chengyan
    Powiązania:
    https://bibliotekanauki.pl/articles/1446124.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    high-phosphorus oolitic iron ore
    gas-based direct reduction
    magnetic separation
    $Fe_3PO_7$
    $CaCO_3$
    Opis:
    Gas-based direct reduction and magnetic separation process was applied in treating a high-phosphorus oolitic iron ore, of which phosphorus mainly occured as $Fe_3PO_7$ and apatite. The mechanism of $CaCO_3$ was investigated using XRD, SEM-EDS, and mineral phase analysis. Results showed that when no CaCO3 was added, most of the iron minerals were reduced to metallic iron, while $Fe_3PO_7$ was reduced to elemental phosphorus and mixed with the metallic iron particles. When a small amount of $CaCO_3$ was added, $CaCO_3$ preferentially reacted with $SiO_2$, $Al_2O_3$ and other components, preventing them from reacting with FeO and resulting in the increase of iron recovery. When the amount of $CaCO_3$ reached 25%, apatite was produced from the reaction of CaO and $Fe_3PO_7$, which could be later removed by grinding and magnetic separation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 117-124
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of direct reduction time of vanadium titanomagnetite concentrate on the preparation and photocatalytic performance of calcium titanate
    Autorzy:
    Li, Xiaohui
    Kou, Jue
    Sun, Tichang
    Wu, Shichao
    Tian, Yuechao
    Powiązania:
    https://bibliotekanauki.pl/articles/1449028.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    vanadium titanomagnetite concentrate
    calcium titanate
    direction reduction
    metallic iron
    photocatalytic performance
    Opis:
    Effects of direct reduction time of vanadium titanomagnetite concentrate (VTCE) on the preparation and photocatalytic performance of calcium titanate were investigated in this study. It was found that extending the reduction time could not only promote the formation of calcium titanate, but also facilitate the reduction of iron minerals in the reduction products. The optimum reduction time was 180min under the conditions of $CaCO_3$ dosage of 18wt%, reduction temperature of 1400℃ and lignite dosage of 70wt%. The reduced iron (Fe grade of 90.95wt%, Fe recovery of 92.21wt%) and calcium titanate were obtained via grinding-magnetic separation. Moreover, calcium titanate prepared via the direct reduction method could be used as a photocatalyst, where the degradation degree of methylene blue increased from 25.13% to 60.14% with the addition of calcium titanate. Furthermore, Langmuir Hinshelwood fitting results indicated that the degradation of methylene blue by the calcium titanate prepared under different reduction times conformed to first-order reaction kinetics, where the photocatalytic degradation rate of methylene blue was noted to be the highest for a reduction time of 180 min.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 1; 75-86
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects and mechanism of Bayer red mud on co-reduction with a saprolitic laterite ore to prepare ferronickel
    Autorzy:
    Wang, Xiaoping
    Sun, Tichang
    Wu, Shichao
    Hu, Tianyang
    Rong, Lingkun
    Powiązania:
    https://bibliotekanauki.pl/articles/1449072.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    red mud
    laterite ore
    co-reduction
    ferronickel powder
    Opis:
    Co-reduction of a saprolitic laterite and waste Bayer red mud was investigated to prepare ferronickel powder. The synchronous reduction and comprehensive recovery of nickel and iron in the low-grade laterite ores and iron in the red mud were realized. At the red mud dosage of 50 wt%, ferronickel powder with nickel and iron grades of 5.58 wt% and 89.91 wt% was obtained. The corresponding nickel and total iron recoveries were 93.11 wt% and 90.23 wt%, respectively. The red mud enhanced the nickel recovery of the saprolitic laterite ore evidently, attributing to the formation of low-melting anorthite, omphacite, and diopside during co-reduction. This led that NiO in the saprolitic ore was released. Meanwhile, obvious melting phenomenon of the roasting system was appeared, enhancing the growth of the ferronickel particles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 4; 641-652
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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