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    Wyświetlanie 1-3 z 3
    Tytuł:
    Properties of flash roasted products from low-grade refractory iron tailings and improvement method for their magnetic separation index
    Autorzy:
    Wan, He
    Lu, Xianlu
    Luukkanen, Saija
    Qu, Juanping
    Zhang, Chonghui
    Chen, Yanxin
    Bu, Xianzhong
    Powiązania:
    https://bibliotekanauki.pl/articles/2175437.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    roasted products
    low-grade refractory iron tailings
    magnetic separation
    MLA
    Opis:
    The properties of flash-roasted products from low-grade refractory iron tailings (IGRIT) and the improved method for their magnetic separation index were investigated by the MLA, XRD, iron phase analysis, and magnetic separation test. The results show the siderite and hematite in the IGRIT have been converted to magnetic iron after the flash roasting treatment with a time of 3-5 s; magnetic iron in roasted products has a monomeric dissociation of 37.20%, and a 75−100% exposed area of contiguous bodies as rich intergrowth was 29.83%, and that a 32.97 poor intergrowth; moreover, magnetic iron is mainly associated with muscovite and quartz. It is also found that the regrindingmagnetic separation (1500 Oe) treatment of the middling was beneficial to obtain more qualified iron concentrate products. Therefore, roasted products magnetic separation process in the absence/ presence of the middling regrinding-magnetic separation treatment obtains an iron concentrate with 60.10%/ 60.12% iron grade and 72.04%/81.13% iron recovery. The iron concentrate from the magnetic separation process with middling regrinding-magnetic separation can have a 9% higher recovery than the process without middling regrinding-magnetic separation. The work is significant for helping to improve the utilization of IGRIT.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 156725
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of fluidized magnetizing roasting on iron recovery and transformation of weakly magnetic iron mineral phasein iron tailings
    Autorzy:
    Li, Wenbo
    Han, Yuexin
    Liu, Xiao
    Shan, Yan
    Li, Yanjun
    Powiązania:
    https://bibliotekanauki.pl/articles/110633.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    iron tailings
    fluidized magnetizing roasting
    hematite
    limonite
    iron phase transformation
    low intensity magnetic separation
    Opis:
    The eastern tailings of the Anshan mining area are generally categorized as high silicon-bearing iron tailings, and the iron mainly exists in the form of hematite–limonite with an iron grade of 10.60%. In order to recover iron minerals and reduce the influence of the tailings on the environment, a method for pre-enrichment through the combination of low intensity magnetic separation and high intensity magnetic separation with fluidized magnetizing roasting and subsequent low intensity magnetic separation was developed to treat the eastern tailings of the Anshan mining area. The effects of gas-flow rate, H2 concentration, roasting temperature, and roasting time on the quality of the final iron concentrate were discussed. Moreover, the iron phase transformation and change in magnetism of the sample were studied. The results indicated that an iron concentrate with an iron grade of 65.30% and a recovery of 85.85% could be obtained under the conditions of gas-flow rate of 8 m3/h, H2 concentration of 50%, and fluidized magnetizing roasting at 600 ℃ for 20 s. X-ray diffraction analysis, phase analysis, and magnetism analysis on the roasted materials indicated that the hematite–limonite could be transformed into magnetite during the fluidized magnetizing roasting process, and effective separation of iron and gangues could be easily achieved by the weak magnetic separation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 4; 906-916
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Next generation technology for utilization of alumina rich iron ore tailings in India
    Autorzy:
    Mukopadhyay, Sudipta
    Periyasamy, Muthaimanoj
    Powiązania:
    https://bibliotekanauki.pl/articles/2064366.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    iron ore tailings
    IOTs
    hydrometallurgy
    mineral processing
    iron containing nanoparticles
    ICNs
    odpady przeróbcze rudy żelaza
    hydrometalurgia
    przeróbka surowców mineralnych
    nanocząstki zawierające żelazo
    Opis:
    Accumulation of low-grade iron ore tailings (IOTs) generated during the processing of high-grade iron ore has become a great threat to environment. Although wide range of research works has carried out to recover the iron values from the IOTs, but the solid recovery value has limited to ca. 50% in Indian context. In order to attain a maximum iron recovery and to utilize these solid wastes for future needs, an attention has shed on the topics of hydrometallurgy and applied nanomaterial synthesis from IOTs. Iron containing nanoparticles (ICNs) have huge potential in environmental and energy related applications. A wide range of synthesis methods has developed to produce ICNs from the mine waste. It is evident from the recent research works that converting waste materials into value added products are gaining more attentions. Objective of this review is to analyse the green synthesis routes to prepare ICNs from mine waste, starting from the physio chemical identification of waste material followed by discussion on various methods of ICNs synthesis routes from mine waste. It includes selective leaching method. Finally, the use of ICNs for environmental application had discussed in brief.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 78--85
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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