1 Inner Mongolia Niobium Metallurgical Engineering Laboratory, Baotou Research Institute of Rare Earths, Baotou 014030, Inner Mongolia, China 2 State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou 014030, Inner Mongolia, China
Niobium and phosphorus behavior during melting-separation process of pre-reduced niobium ore concentrate
1 Inner Mongolia Niobium Metallurgical Engineering Laboratory, Baotou Research Institute of Rare Earths, Baotou 014030, Inner Mongolia, China 2 State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou 014030, Inner Mongolia, China
ժҪ 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.
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.
Yu-bao Liu,,Zhi-hong Zhang,,Er-xiong Zhao,,Xian-heng Zhang,,Xiao-qing Wang,, Guo-hua Chen,. Niobium and phosphorus behavior during melting-separation process of pre-reduced niobium ore concentrate[J]. �й������ڿ���, 2017, 24(7): 691-696.
Yu-bao Liu,,Zhi-hong Zhang,,Er-xiong Zhao,,Xian-heng Zhang,,Xiao-qing Wang,, Guo-hua Chen,. Niobium and phosphorus behavior during melting-separation process of pre-reduced niobium ore concentrate. Chinese Journal of Iron and Steel, 2017, 24(7): 691-696.
2017, Vol. 24 
