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    Wyświetlanie 1-3 z 3
    Tytuł:
    An innovative methodology for recycling iron from magnetic preconcentrate of an iron ore tailing
    Autorzy:
    Yu, J.
    Han, Y.
    Gao, P.
    Li, Y.
    Yuan, S.
    Li, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/110888.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    magnetic preconcentrate
    iron ore tailing
    iron recycling
    fluidized magnetization roasting
    magnetic separation
    Opis:
    Iron ore tailing is a kind of hazardous solid waste produced by iron and steel industry. In order to separate and recycle iron from the magnetic preconcentrate of an iron ore tailing, an innovative technological route of fluidized magnetization roasting followed by low-intensity magnetic separation was proposed in this paper. The effects of roasting temperature, dosages of reducing gas CO and fluidizing gas N2 on recovery rate of iron were carried out and optimized. The results showed that the hematite was almost reduced to magnetite by a gas mixture of 4 m3/h CO and 1 m3/h N2 at roasting temperature of 540 °C. Under the optimized conditions, a magnetic concentrate assaying 61.4 wt% Fe with a recovery rate of 81.8% was obtained from the magnetic preconcentrate of an iron ore tailing. The iron chemical phase, X-ray diffraction (XRD), and optical metallographic microscope analyses revealed that siderite was converted to magnetite successfully after roasting, and some coarse magnetite-hematite interlocking particles were formed due to insufficient reaction time, which could also be recovered by magnetic separation after liberating from gangue minerals.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 668-676
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Recycling of Materials Containing Iron and Zinc in the OxyCup Process
    Autorzy:
    Holtzer, M.
    Kmita, A.
    Roczniak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382832.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    recycling
    iron
    zinc
    modern technologies
    wastes
    recykling
    żelazo
    cynk
    nowoczesna technologia
    odpady
    Opis:
    Environmentally friendly and economically profitable technologies, enabling utilisation of wastes from metallurgical processes and regeneration of Fe and Zn contained in them, are looked for. This allows also saving of natural resources such as ores. Several techniques have been developed and introduced for recycling sludge and dust that contain iron and zinc. Currently, there are three major ways to treat zinc -bearing dust: rotary hearth furnaces method (the FASTMET process), rotary kiln method (the Waelza process), shaft furnace method (the OXYCUP method). This technology can be used to fully recycle metallurgical wastes such as slag crusts or metal-bearing fractions of desulfurization slags without the need for additional preparation of these materials, dust, sludge and scale generated in different stages of iron and steelmaking. The OXYCUP process described in paper combines the function of melting in traditional cupola furnaces (CF) with function of reduction in blast furnaces (BF).
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 126-130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced processing for recycling of iron scrap with impurities
    Autorzy:
    Osawa, Y.
    Takamori, S.
    Minagawa, K.
    Kakisawa, H.
    Halada, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146109.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    recycling
    steel scrap
    copper
    aluminum
    powder metallurgy
    cast iron
    Opis:
    The present research focuses on the recycling of steel in combination with copper or aluminum alloys. To use iron scrap with a copper content in the range of 0.5 to 15%, a water atomization process was carried out, producing a rapidly solidified powder with copper of nano-order size dispersed in it. The powder was then hot rolled in the 600°C to 1000°C temperature region, where there is no liquid phase of copper, to produce a solid body. The solid bodies obtained presented a porosity of less than 1% for all the values of temperature and copper concentration, and it was established that the proposed process can be used for a wide range of concentrations of metallic impurities. The tensile strength increased with the copper content for all the temperatures, reaching stability at a copper concentration over 5%. Rapidly solidified powder was annealed and compacted at 600°C, resulting in a reduction of strength compared to non-annealed powder. The microstructure with a finely dispersed copper content seemed to have a considerable effect on the tensile strength of the compacted bodies. In the case of the use of aluminum-containing iron scrap, the results show that addition of aluminum to cast iron increased the resistance to abrasion, the high temperature oxidation characteristics, and the vibration control characteristics. When this cast iron was kept in air at temperatures ranging from 800°C to 1000°C, it was observed that the graphite on the surface was substituted by alumina.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 113-119
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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