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公开(公告)号：US10718036B2
公开(公告)日：2020-07-21
申请号：US15578498
申请日：2016-06-14
发明人： Pouya Hajiani
摘要： A method for hydrometallurgical extraction of rare earth elements and niobium from a an ore or a flotation concentrate containing rare earth elements, niobium, iron and alkali earth metals, the method comprising removal of the alkali earth metals using an acidic solution of a pH in a range between about 1 and about 6, leaching the rare earth elements; precipitation of the rare earth elements from a resulting pregnant leach solution using sodium hydroxide, sodium carbonate and sodium bicarbonate; physically separating metal hydroxides from a resulting leach residue containing metal hydroxides, iron oxide, silicate, and pyrochlore; removing the iron oxide by physical beneficiation and then by atmospheric acid leaching; and recovering niobium from a clean solid residue by pressurized acid leaching.
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公开(公告)号：US10422025B2
公开(公告)日：2019-09-24
申请号：US15928187
申请日：2018-03-22
申请人： Paul R. Aimone , Evan Hinshaw
发明人： Paul R. Aimone , Evan Hinshaw
摘要： A tantalum or tantalum alloy which contains pure or substantially pure tantalum and at least one metal element selected from the group consisting of Ru, Rh, Pd, Os, Ir, Pt, Mo, W and Re to form a tantalum alloy that is resistant to aqueous corrosion. The invention also relates to the process of preparing the tantalum alloy.
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公开(公告)号：US10190193B2
公开(公告)日：2019-01-29
申请号：US15030907
申请日：2014-10-21
IPC分类号： C22B1/11 , C22B3/12 , C22B3/14 , C22B1/14 , C22B3/00 , C21B15/00 , C22B30/04 , C22B34/22 , C22B34/24
摘要： A method for treating a mineral composition containing iron, arsenic or other Group VA compounds comprises milling the mineral composition to a particle size of P80 of less than 25 μm and leaching the mineral composition in the presence of lime and/or limestone and a soluble alkali complexing agent and in the presence of an oxygen containing gas at a pH in the range of from 3.5 to 6.
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公开(公告)号：US20190003012A1
公开(公告)日：2019-01-03
申请号：US15695551
申请日：2017-09-05
CPC分类号： C22B34/24 , C22B1/24 , C22B4/06 , C22B5/04 , C22B5/16 , C22B9/04 , C22C27/02 , C22C33/00 , C22C35/005
摘要： Refined niobium-based ferroalloys are provided by removing lead and other impurities therefrom by a process comprising charging niobium ore concentrate and/or niobium oxide or a mixture of niobium oxides to a metallothermic reaction chamber, admixing the ore concentrate and/or niobium oxide with a reducing agent, initiating a metallothermic reaction, under reduced pressure; and allowing the reaction product to solidify and cool; crushing the reaction product or crushing the niobium-based ferroalloy previously reduced in open air, and charging the crushed product to a melting crucible within a vacuum induction melting furnace, lowering the pressure within the furnace to below 1 mbar, and melting the crushed product while vaporizing the impurities contained therein.
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公开(公告)号：US20170342526A1
公开(公告)日：2017-11-30
申请号：US15643980
申请日：2017-07-07
申请人： Paul R. Aimone , Evan Hinshaw
发明人： Paul R. Aimone , Evan Hinshaw
摘要： A tantalum or tantalum alloy which contains pure or substantially pure tantalum and at least one metal element selected from the group consisting of Ru, Rh, Pd, Os, Ir, Pt, Mo, W and Re to form a tantalum alloy that is resistant to aqueous corrosion. The invention also relates to the process of preparing the tantalum alloy.
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6.发明授权Valve metal and valve metal oxide agglomerate powders and method for the production thereof 有权阀金属和阀金属氧化物附聚物粉末及其制备方法公开(公告)号：US09466433B2
公开(公告)日：2016-10-11
申请号：US14624590
申请日：2015-02-18
申请人： H. C. STARCK GMBH
发明人： Christoph Schnitter , Holger Brumm
CPC分类号： H01G9/042 , B22F1/0096 , B22F3/1134 , B22F3/1146 , B22F3/12 , B22F5/00 , B22F2998/10 , C01G33/00 , C01P2006/12 , C01P2006/40 , C01P2006/90 , C22B34/24 , H01G9/0525 , Y10T29/49002 , Y10T428/2982 , B22F3/26
摘要： A refractory metal compound agglomerate powder having a product of a BET surface area in m2/g and a sliding coefficient of η of 0.33 to 0.95, wherein the refractory metal compound agglomerate powder is selected from niobium agglomerate powder, niobium suboxide agglomerate powder, and tantalum agglomerate powder.
摘要翻译： 具有BET表面积（m 2 / g）和η的滑动系数为0.33〜0.95的难熔金属化合物附聚物粉末，其中难熔金属化合物附聚物粉末选自铌团聚体粉末，低氧化铌附聚物粉末和钽 附聚粉末。
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公开(公告)号：US09085468B2
公开(公告)日：2015-07-21
申请号：US13467070
申请日：2012-05-09
CPC分类号： C01G33/00 , C01P2002/72 , C01P2006/10 , C01P2006/12 , C01P2006/40 , C01P2006/80 , C22B34/24 , H01G9/0525 , Y10T29/417 , Y10T428/12819 , Y10T428/2982
摘要： A niobium suboxide powder comprising niobium suboxide particles having a bulk nitrogen content of between 500 to 20,000 ppm. The nitrogen is distributed in the bulk of the powder particles. The nitrogen at least partly is present in the form of at least one of Nb2N crystals or niobium oxynitride crystals.
摘要翻译： 一种低氧化铌粉末，其包含体积氮含量在500至20,000ppm之间的低氧化铌颗粒。 氮分散在大部分粉末颗粒中。 氮至少部分以Nb 2 N晶体或铌氧氮化物晶体中的至少一种形式存在。
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公开(公告)号：US08852317B2
公开(公告)日：2014-10-07
申请号：US13635890
申请日：2011-03-24
申请人： Mami Yoshida , Kenji Matsuzaki , Tatsuya Aoki , Rintaro Ishii
发明人： Mami Yoshida , Kenji Matsuzaki , Tatsuya Aoki , Rintaro Ishii
摘要： The present invention provides a technology for recovering high-content tantalum from tantalum-containing waste with reducing various impurities such as antimony (Sb) and phosphorus (P) which hinder reuse of the tantalum in tantalum capacitors. The method for recovering tantalum from tantalum-containing waste according to the present invention is characterized in that tantalum-containing waste is subjected to an acid treatment and then to an alkali treatment, thereby recovering tantalum. The acid treatment is preferably performed with use of an acid containing hydrochloric acid and the alkali treatment is preferably performed with use of sodium hydroxide or potassium hydroxide. The tantalum-containing waste in the present invention is preferably a tantalum sintered compact collected from a tantalum capacitor.
摘要翻译： 本发明提供一种从钽含量废弃物中回收高含量钽的技术，其中减少了诸如锑（Sb）和磷（P）等各种杂质，这阻碍了钽在钽电容器中的再利用。 根据本发明的从含钽废物中回收钽的方法的特征在于，对含钽废物进行酸处理，然后进行碱处理，从而回收钽。 酸处理优选使用含有酸的酸进行，碱处理优选使用氢氧化钠或氢氧化钾进行。 本发明的含钽废物优选为从钽电容器收集的钽烧结体。
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公开(公告)号：US20080233420A1
公开(公告)日：2008-09-25
申请号：US11690523
申请日：2007-03-23
CPC分类号： C22B34/24 , B22F1/0055 , B22F9/023 , C22B9/14 , Y10T428/12014
摘要： The present invention relates to a high-purity tantalum flake powder, produced by a hydride-dehydride process including: (a) cold working tantalum metal into a thin sheet; (b) hydriding the thin sheet, forming a brittle tantalum foil; (c) adjusting the tantalum foil to a desired particle size; and (d) removing hydrogen from the tantalum foil by vacuum sintering, forming a tantalum flake powder. In accordance with the present invention, tantalum flake is produced by sizing ultra-thin tantalum foil via the hydride-dehydride process. Tantalum is an extremely malleable metal and can be cold worked into extremely thin sheets less than 1 micron thick. Once hydrided, this foil is brittle, and can be easily sized by suitable milling processes. The hydrogen is removed by vacuum sintering, resulting in an extremely thin Ta metal flake.
摘要翻译： 本发明涉及一种通过氢化物 - 脱氢法生产的高纯度钽片粉末，它包括：（a）冷加工钽金属成薄片; （b）使薄片氢化，形成脆性钽箔; （c）将钽箔调节至所需的粒度; 和（d）通过真空烧结从钽箔中除去氢，形成钽片粉末。 根据本发明，通过氢化物 - 脱氢工艺对超薄钽箔进行定型来制造钽片。 钽是一种非常有弹性的金属，可以冷加工成小于1微米厚的极薄片。 一旦氢化，该箔是脆性的，并且可以通过合适的研磨工艺容易地定尺寸。 通过真空烧结除去氢，导致极薄的钽金属薄片。
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公开(公告)号：US20050019581A1
公开(公告)日：2005-01-27
申请号：US10894279
申请日：2004-07-19
申请人： Christoph Schnitter
发明人： Christoph Schnitter
IPC分类号： C01G33/00 , C04B35/495 , C22B5/04 , C22B34/24 , H01G9/00 , H01G9/042 , H01G9/052 , C22C32/00 , B22F1/02 , B32B5/16 , B32B15/00
CPC分类号： H01G9/0525 , C01G33/00 , C01P2004/51 , C01P2004/61 , C01P2004/62 , C01P2006/12 , C01P2006/20 , C01P2006/40 , C04B35/495 , C04B35/6265 , C04B35/6268 , C04B2235/3251 , C04B2235/3253 , C04B2235/528 , C04B2235/5409 , C04B2235/5427 , C04B2235/5445 , C04B2235/5481 , C04B2235/549 , C04B2235/608 , C04B2235/6581 , Y10T428/31504
摘要： A method is described for preparing a niobium suboxide represented by the formula, NbOx, in which 0.7
摘要翻译： 描述了制备由式NbO x表示的低氧化铌的方法，其中0.7
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