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Volume 25 Issue 7
Jul.  2018
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文章导航 >  矿物冶金与材料学报（英文）  > 2018  >  25(7): 744-751
Lun-wei Wang, Xue-ming Lü, Mei Liu, Zhi-xiong You, Xue-wei Lü,  and Chen-guang Bai, Preparation of ferronickel from nickel laterite via coal-based reduction followed by magnetic separation, Int. J. Miner. Metall. Mater., 25(2018), No. 7, pp. 744-751. https://doi.org/10.1007/s12613-018-1622-7
Cite this article as:
Lun-wei Wang, Xue-ming Lü, Mei Liu, Zhi-xiong You, Xue-wei Lü,  and Chen-guang Bai, Preparation of ferronickel from nickel laterite via coal-based reduction followed by magnetic separation, Int. J. Miner. Metall. Mater., 25(2018), No. 7, pp. 744-751. https://doi.org/10.1007/s12613-018-1622-7
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研究论文

Preparation of ferronickel from nickel laterite via coal-based reduction followed by magnetic separation

  • College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

  • Engineer of CISDI Thermal & Environmental Engineering Co., Ltd., Chongqing 401122, China

  • 通讯作者:

    Zhi-xiong You    E-mail: youzx@cqu.edu.cn

    Xue-wei Lü    E-mail: lvxuewei@163.com

  • The sticking phenomenon between molten slag and refractory is one of the crucial problems when preparing ferronickel from laterite ore using rotary hearth furnace or rotary kiln processes. This study aims to ameliorate sticking problems by using silicon dioxide (SiO2) to adjust the melting degree of the briquette during reduction roasting. Thermodynamic analysis indicates that the melting temperature of the slag gradually increases with an increase in the SiO2 proportion (SiO2/(SiO2 + Al2O3 + MgO) mass ratio). Experimental validations also prove that the briquette retains its original shape when the SiO2 proportion is greater than 75wt%, and sticking problems are avoided during reduction. A ferronickel product with 8.33wt% Ni and 84.71wt% Fe was prepared via reductive roasting at 1500℃ for 90 min with a SiO2 proportion of 75wt% and a C/O molar ratio of 1.0 followed by dry magnetic separation; the corresponding recoveries of Ni and Fe reached 75.70% and 77.97%, respectively. The microstructure and phase transformation of reduced briquette reveals that the aggregation and growth of ferronickel particles were not significantly affected after adding SiO2 to the reduction process.
    • Research Article

    Preparation of ferronickel from nickel laterite via coal-based reduction followed by magnetic separation

    + Author Affiliations
      Abstract
    • The sticking phenomenon between molten slag and refractory is one of the crucial problems when preparing ferronickel from laterite ore using rotary hearth furnace or rotary kiln processes. This study aims to ameliorate sticking problems by using silicon dioxide (SiO2) to adjust the melting degree of the briquette during reduction roasting. Thermodynamic analysis indicates that the melting temperature of the slag gradually increases with an increase in the SiO2 proportion (SiO2/(SiO2 + Al2O3 + MgO) mass ratio). Experimental validations also prove that the briquette retains its original shape when the SiO2 proportion is greater than 75wt%, and sticking problems are avoided during reduction. A ferronickel product with 8.33wt% Ni and 84.71wt% Fe was prepared via reductive roasting at 1500℃ for 90 min with a SiO2 proportion of 75wt% and a C/O molar ratio of 1.0 followed by dry magnetic separation; the corresponding recoveries of Ni and Fe reached 75.70% and 77.97%, respectively. The microstructure and phase transformation of reduced briquette reveals that the aggregation and growth of ferronickel particles were not significantly affected after adding SiO2 to the reduction process.
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