1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 2. Key Laboratory of Green Process andEngineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
Influence of Na2CO3 as Additive on Direct Reduction of Boron-bearing Magnetite Concentrate
1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 2. Key Laboratory of Green Process andEngineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
ժҪ Boron-bearing magnetite concentrate is typically characterized by low grade of iron and boron (wTFe=51%-54%, wB2O3=6%-8%), as well as the close intergrowth of ascharite phase and magnetite phase. A promising technology was proposed to separate iron and boron by coupling the direct reduction of iron oxides and Na activation of boron minerals together. The influence of Na2CO3 as additive on the direct reduction of boron-bearing magnetite was studied by chemical analysis, kinetic analysis, XRD analysis and SEM analysis. The results showed that the addition of Na2CO3 not only activated boron minerals, but also reduced the activation energy of the reaction and promoted the reduction of iron oxides. Besides, the addition of Na2CO3 changed the composition and melting point of non-ferrous phase, and then promoted the growth and aggregation of iron grains, which was conducive to the subsequent magnetic separation. Thus, the coupling of the two processes is advantageous.
Abstract��Boron-bearing magnetite concentrate is typically characterized by low grade of iron and boron (wTFe=51%-54%, wB2O3=6%-8%), as well as the close intergrowth of ascharite phase and magnetite phase. A promising technology was proposed to separate iron and boron by coupling the direct reduction of iron oxides and Na activation of boron minerals together. The influence of Na2CO3 as additive on the direct reduction of boron-bearing magnetite was studied by chemical analysis, kinetic analysis, XRD analysis and SEM analysis. The results showed that the addition of Na2CO3 not only activated boron minerals, but also reduced the activation energy of the reaction and promoted the reduction of iron oxides. Besides, the addition of Na2CO3 changed the composition and melting point of non-ferrous phase, and then promoted the growth and aggregation of iron grains, which was conducive to the subsequent magnetic separation. Thus, the coupling of the two processes is advantageous.
��������:the National Natural Science Foundation of China;National Science Foundation for Distinguished Young Scholars of China
ͨѶ����:
Tao Qi
E-mail: tqgreen@ipe.ac.cn
����:
Yong-li LI,,Jing-kui QU,,Guang-ye WEI,,Tao QI,. Influence of Na2CO3 as Additive on Direct Reduction of Boron-bearing Magnetite Concentrate[J]. �й������ڿ���, 2016, 23(2): 103-108.
Yong-li LI,,Jing-kui QU,,Guang-ye WEI,,Tao QI,. Influence of Na2CO3 as Additive on Direct Reduction of Boron-bearing Magnetite Concentrate. Chinese Journal of Iron and Steel, 2016, 23(2): 103-108.
2016, Vol. 23 
