Abstract
The pre-reduced Bayan Obo ferroniobium (FeNb) ore concentrate block was taken as raw materials for studying the physical properties of niobium-enriched slag and changes in niobium recovery rate. In addition, the dephosphorization rate of the slag under different melting-separation conditions was investigated using the melting-separation test. The research results demonstrate that (i) the niobium recovery rate and dephosphorization rate of the slag decrease with the increase in melting-separation temperature; (ii) the niobium recovery rate of the slag initially increases and then decreases with increase in basicity and time; and (iii) the dephosphorization rate of the slag increases with the increase in basicity and time. When the test was performed under the conditions of basicity of 0.6–0.7, time of 7–10 min, and temperature of 1400–1450 °C, the niobium recovery rate and dephosphorization rate are over 96% and 95%, respectively. By scanning electron microscopy, it is observed that niobium mainly exists in the form of calcium and titanium silicate within the slag phase, with uneven distribution.
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Liu, Yb., Zhang, Zh., Zhao, Ex. et al. Niobium and phosphorus behavior during melting-separation process of pre-reduced niobium ore concentrate. J. Iron Steel Res. Int. 24, 691–696 (2017). https://doi.org/10.1016/S1006-706X(17)30104-8
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DOI: https://doi.org/10.1016/S1006-706X(17)30104-8