Generation process of FeS and its inhibition mechanism on iron mineral reduction in selective direct reduction of laterite nickel ore

Zhi-guo Liu, Ti-chang Sun, Xiao-ping Wang, En-xia Gao

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    Zhi-guo Liu, Ti-chang Sun, Xiao-ping Wang, and En-xia Gao, Generation process of FeS and its inhibition mechanism on iron mineral reduction in selective direct reduction of laterite nickel ore, Int. J. Miner. Metall. Mater., 22(2015), No. 9, pp.901-906. https://dx.doi.org/10.1007/s12613-015-1148-1
    Zhi-guo Liu, Ti-chang Sun, Xiao-ping Wang, and En-xia Gao, Generation process of FeS and its inhibition mechanism on iron mineral reduction in selective direct reduction of laterite nickel ore, Int. J. Miner. Metall. Mater., 22(2015), No. 9, pp.901-906. https://dx.doi.org/10.1007/s12613-015-1148-1
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    Generation process of FeS and its inhibition mechanism on iron mineral reduction in selective direct reduction of laterite nickel ore

    • School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    基金项目: 

    The authors wish to express their gratitude to the Specialized Research Fund for the Doctoral Program of Higher Education of China (No.20130006110017) for the financial support for this research.

      通信作者:

      Ti-chang Sun E-mail: suntc@ces.ustb.edu.cn

    中文摘要

    Numerous studies have demonstrated that Na2SO4 can significantly inhibit the reduction of iron oxide in the selective reduction process of laterite nickel ore. FeS generated in the process plays an important role in selective reduction, but the generation process of FeS and its inhibition mechanism on iron reduction are not clear. To figure this out, X-ray diffraction and scanning electron microscopy analyses were conducted to study the roasted ore. The results show that when Na2SO4 is added in the roasting, the FeO content in the roasted ore increases accompanied by the emergence of FeS phase. Further analysis indicates that Na2S formed by the reaction of Na2SO4 with CO reacts with SiO2 at the FeO surface to generate FeS and Na2Si2O5. As a result, a thin film forms on the surface of FeO, hindering the contact between reducing gas and FeO. Therefore, the reduction of iron is depressed, and the FeO content in the roasted ore increases.

     

    Generation process of FeS and its inhibition mechanism on iron mineral reduction in selective direct reduction of laterite nickel ore

    Author Affilications

      • School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    • Funds: 

      The authors wish to express their gratitude to the Specialized Research Fund for the Doctoral Program of Higher Education of China (No.20130006110017) for the financial support for this research.

    • Received: 15 December 2014; Revised: 01 April 2015; Accepted: 06 April 2015;
    Numerous studies have demonstrated that Na2SO4 can significantly inhibit the reduction of iron oxide in the selective reduction process of laterite nickel ore. FeS generated in the process plays an important role in selective reduction, but the generation process of FeS and its inhibition mechanism on iron reduction are not clear. To figure this out, X-ray diffraction and scanning electron microscopy analyses were conducted to study the roasted ore. The results show that when Na2SO4 is added in the roasting, the FeO content in the roasted ore increases accompanied by the emergence of FeS phase. Further analysis indicates that Na2S formed by the reaction of Na2SO4 with CO reacts with SiO2 at the FeO surface to generate FeS and Na2Si2O5. As a result, a thin film forms on the surface of FeO, hindering the contact between reducing gas and FeO. Therefore, the reduction of iron is depressed, and the FeO content in the roasted ore increases.

     

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