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Evaluation of Sintering Behaviors of Saprolitic Nickeliferous Laterite Based on Quaternary Basicity

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Abstract

The sintering behaviors of saprolitic nickeliferous laterite with various quaternary basicities [(CaO + MgO)/(SiO2 + Al2O3) mass ratio] in a reductive atmosphere are investigated by simulative sintering and validated by sintering pot tests. The simulative sintering results show that the generation of diopside (CaMgSi2O6) with low melting point is the key reason for the decrease in characteristic fusion temperatures when the quaternary basicity increases from 0.5 to 0.8–1.0. Continuous increase of basicity leads to transformation of diopside (CaMgSi2O6) into akermanite (Ca2MgSi2O7), which adversely increases the characteristic fusion temperatures. These findings are confirmed by the sinter pot tests, which demonstrate that the sintering indexes including vertical sintering velocity (VSV), yield (Y), and productivity (P), can be improved by optimizing quaternary basicity. At basicity of 1.0, the VSV, Y, P, and ISO tumbling index reach 49.2 mm/min, 80.5%, 1.0 t/(h m2), and 66.5%, respectively.

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Acknowledgements

The authors wish to express their thanks to the Program for New Century Excellent Talents in University (NCET-11-0515) for financial support of this research. This work was also financially supported by Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources.

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Authors and Affiliations

  1. School of Minerals Processing & Bioengineering, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Jun Luo, Guanghui Li, Mingjun Rao, Yuanbo Zhang, Zhiwei Peng, Qian Zhi & Tao Jiang

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  1. Jun Luo
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  2. Guanghui Li
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  3. Mingjun Rao
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  4. Yuanbo Zhang
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  5. Zhiwei Peng
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  6. Qian Zhi
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  7. Tao Jiang
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Correspondence to Guanghui Li.

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Luo, J., Li, G., Rao, M. et al. Evaluation of Sintering Behaviors of Saprolitic Nickeliferous Laterite Based on Quaternary Basicity. JOM 67, 1966–1974 (2015). https://doi.org/10.1007/s11837-015-1544-z

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  • DOI: https://doi.org/10.1007/s11837-015-1544-z

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