Deoxygenation process of high oxygen niobium powders by magnesium reduction
LIU Fang1,2, LI Qingkui1, LUO Junfeng2, XU Guojin2, ZHANG Qiaoxia2
1. Henan Province Industrial Technology Research Institute of Resources and Materials,Zhengzhou University, Zhengzhou 450001, China; 2. Grikin Advanced Materials Co., Ltd, Beijing 102200, China
Abstract Hydrogen-dehydrogenation and oxygen reduction equipment was used to reduce the oxygen content of the industrial niobium powder with an original oxygen content of 4.1×10-3 by magnesium reduction. The effects of reduction temperature, reduction time and magnesium powder amount on the oxygen content of niobium powder were studied. The magnesium reduction and oxygen reduction process of niobium powder was optimized. The results show that when the reduction temperature is 1 133 K and the amount of magnesium is enough, the oxygen content of niobium powder decreases first and then tends to be stable with the increase of reduction time. The oxygen content of deoxidized niobium powder decreases from 8.90×10-4 to 3.56×10-4 with the increase of reduction temperature from 953 K to 1 133 K at 4 times of theoretical magnesium addition and 4 h of reduction time. With increasing the temperature to 1 203 K, the oxygen content of niobium powder increases instead. The best magnesium reduction process of niobium powder is that the reduction temperature is 1 133 k, the amount of magnesium is 4 times of the theoretical amount, the reduction time is 4 h, and the oxygen content of niobium powder after deoxidization is 3.56×10-4. The morphology of niobium powder is basically unchanged.
LIU Fang,LI Qingkui,LUO Junfeng, et al. Deoxygenation process of high oxygen niobium powders by magnesium reduction[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 227-233.
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2020, Vol. 25 
