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1.发明公开公开(公告)号：US20240150194A1
公开(公告)日：2024-05-09
申请号：US18284211
申请日：2022-08-24
发明人： Shun Guo , Jinfeng Zheng , Tao Guo , Hongyuan Liang , Yuewei Cheng , Jingyi Zuo , Li Zhang , Ying Wang , Tong Liu , Hongjie Qin
IPC分类号： C01G35/00
CPC分类号： C01G35/00 , C01P2006/80
摘要： A low-carbon, high-purity tantalum pentoxide powder has a carbon content of no greater than 15 ppm. A preparation method for the powder includes: (1) adding a fluotantalic acid (H2TaF7) solution into a reaction kettle, controlling the temperature of the reaction kettle at 30-60° C., adding a precipitator until the pH of the reaction solution is 8-10, then stopping introducing ammonia, and aging to obtain a tantalum hydroxide slurry; (2) filtering and washing the slurry obtained in step (1), and then carrying out solid-liquid separation to obtain a tantalum hydroxide filter cake; (3) drying the filter cake obtained in step (2) to obtain white tantalum hydroxide powder; (4) calcining the tantalum hydroxide powder obtained in step (3), crushing and screening the calcined sample to obtain tantalum pentoxide powder; and (5) subjecting the tantalum pentoxide powder obtained in step (4) to heat treatment at a temperature of 1000-1500° C. to obtain the powder.
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2.发明公开公开(公告)号：US20240198422A1
公开(公告)日：2024-06-20
申请号：US18288855
申请日：2022-08-24
发明人： Yuewei Cheng , Jinfeng Zheng , Hongyuan Liang , Shun Guo , Haiyan Ma , Jingyi Zuo , Li Zhang , Hongjie Qin , Tong Liu , Ying Wang
CPC分类号： B22F9/20 , B22F1/142 , B22F1/145 , B22F2201/11 , B22F2201/20 , B22F2301/20 , B22F2998/10 , B22F2999/00
摘要： A method produces tantalum powder by reducing tantalum oxide with an alkaline earth metal. The method includes (1) mixing tantalum oxide with an excessive alkaline earth metal reducing agent, simultaneously mixing at least one alkali metal and/or alkaline earth metal halide accounting for 10-200% of the weight of the tantalum oxide, heating the mixture to a temperature of 700-1200° C. in a furnace filled with inert gas, and soaking so that the tantalum oxide and reducing agent are subjected to a reduction reaction; (2) at the end of soaking, lowering the temperature to 600-800° C., vacuumizing the interior of the furnace to 10 Pa or less, and soaking under the negative pressure so that the excessive magnesium and tantalum powder mixture are separated; (3) thereafter, raising the temperature of the furnace to 750-1200° C. in the presence of inert gas, and soaking so that the tantalum powder is further sintered in the molten salt; (4) then cooling to room temperature and passivating to obtain a mixed material containing halide and tantalum powder; and (5) separating the tantalum powder from the mixture.
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公开(公告)号：US20240157437A1
公开(公告)日：2024-05-16
申请号：US18284362
申请日：2022-08-24
发明人： Yuewei Cheng , Hongyuan Liang , Shun Guo , Jinfeng Zheng , Haiyan Ma , Jingyi Zuo , Li Zhang , Hongjie Qin , Tong Liu , Ying Wang
CPC分类号： B22F1/142 , B22F1/145 , B22F2301/20
摘要： A method produces tantalum powder. The method includes: (1) uniformly mixing a tantalum powder raw material, metal magnesium and at least one alkali metal and/or alkaline earth metal halide, loading the mixture into a container, and putting the container in a furnace; (2) raising the temperature of the furnace to 600-1200° C. in the presence of inert gas, and soaking; (3) at the end of soaking, lowering the temperature of the furnace to 600-800° C., vacuumizing the interior of the furnace to 10 Pa or less, soaking under the negative pressure so that the excessive metal is separated; (4) thereafter, raising the temperature of the furnace to 750-1200° C. in the presence of inert gas, and soaking so that the tantalum powder is sintered in the molten salt after oxygen reduction; (5) then cooling to room temperature and passivating to obtain a mixed material containing halide and tantalum powder; and (6) separating the tantalum powder from the resulting mixture.
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