公开(公告)号：US20090053132A1

公开(公告)日：2009-02-26

申请号：US12196492

申请日：2008-08-22

申请人： Wenfeng SHI ,  Xudong XI ,  Yong LI ,  Xueqing CHEN ,  Wei WANG

发明人： Wenfeng SHI ,  Xudong XI ,  Yong LI ,  Xueqing CHEN ,  Wei WANG

IPC分类号： C01G33/00 ,  B22F9/20

CPC分类号： C01G33/00 ,  B22F9/20 ,  B22F2998/10 ,  C01P2004/03 ,  C01P2006/10 ,  C01P2006/40 ,  C01P2006/80 ,  B22F1/0003 ,  B22F1/0085

摘要： The present invention relates to a process for preparing powders of niobium suboxides or niobium, wherein the process comprising: mixing the niobium oxides as raw material with reducing agent, conducting a reaction at a temperature in the range of 600˜1300° C. in an atmosphere of vacuum or inert gas or hydrogen gas, leaching the reaction product to remove the residual reducing agent and the oxides of the reducing agent and other impurities, heat treating at a temperature of the range of 1000˜1600° C. in an atmosphere of vacuum or inert gas, and screening to obtain the powders of niobium suboxide or niobium of capacitor grade. According to the present invention, the niobium oxides were directly reduced into capacitor grade niobium suboxides or niobium with reducing agents which can be easily removed by mineral acids, wherein the speed of the reaction can be controlled and the reaction can directly reduce the niobium oxides into capacitor grade niobium suboxides or niobium powder. According to the present invention, the process is simple with high yield and high productivity. The products obtained have good flowability, low impurities, uniform distribution of oxygen, and have good electrical properties.

摘要翻译： 本发明涉及一种制备低氧化铌或铌粉末的方法，其中该方法包括：将作为原料的铌氧化物与还原剂混合，在600〜1300℃的温度范围内进行反应 气氛中的真空或惰性气体或氢气，浸出反应产物以除去残留的还原剂和还原剂的氧化物等杂质，在1000〜1600℃的温度范围内进行热处理，在 真空或惰性气体，并筛选得到电容器级的低氧化铌或铌粉末。 根据本发明，铌氧化物通过还原剂直接还原成电容器级铌低氧化物或铌，其可以通过无机酸容易地除去，其中可以控制反应速度，反应可以直接将铌氧化物还原成 电容器级铌粉或铌粉。 根据本发明，该方法简单，产率高，生产率高。 所得产品流动性好，杂质低，氧分布均匀，电性能好。

公开(公告)号：US08673052B2

公开(公告)日：2014-03-18

申请号：US12818379

申请日：2010-06-18

申请人： Wenfeng Shi ,  Xueqing Chen ,  Yong Li ,  Xudong Xi ,  Tao Guo

发明人： Wenfeng Shi ,  Xueqing Chen ,  Yong Li ,  Xudong Xi ,  Tao Guo

IPC分类号： B22F9/20 ,  B22F1/00

CPC分类号： C01G35/00 ,  B22F9/20 ,  B22F2998/10 ,  B22F2999/00 ,  C01P2004/03 ,  C01P2004/62 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/40 ,  H01G9/0029 ,  H01G9/0525 ,  B22F2201/013 ,  B22F2201/20 ,  B22F2201/10 ,  B22F1/0096

摘要： The present invention provides a process for preparing a tantalum powder with high specific capacity, which process comprising the steps of, in sequence, (1) a first reduction step: mixing tantalum oxide powder and a first reducing agent powder homogenously, and then carrying out reduction reaction in hydrogen and/or inert gas or vacuum atmosphere to obtain a tantalum suboxides powder; (2) a second reduction step: mixing the tantalum suboxides powder obtained from the step (1), in which impurities have been removed, and a second reducing agent powder homogenously, and then carrying out reduction reaction in hydrogen and/or inert gas or vacuum atmosphere to obtain a tantalum powder having high oxygen content; (3) a third reduction step: mixing the tantalum powder having high oxygen content obtained from the step (2), in which impurities have been removed, with a third reducing agent powder homogenously, and then carrying out reduction reaction in hydrogen and/or inert gas or vacuum atmosphere to obtain a tantalum metal powder suitable for capacitors; wherein after each reduction step, the oxidation product of reducing agent and the residual reducing agent are removed from the reaction product.

摘要翻译： 本发明提供一种制备高比容量的钽粉的方法，该方法包括以下步骤：（1）第一还原步骤：均匀混合氧化钽粉末和第一还原剂粉末，然后进行 在氢气和/或惰性气体或真空气氛中还原反应，得到低氧化钽粉末; （2）第二还原步骤：将其中除去杂质的步骤（1）获得的低密度氧化钡粉末和均质的第二还原剂粉末混合，然后在氢气和/或惰性气体中进行还原反应，或 真空气氛，得到氧含量高的钽粉末; （3）第三还原步骤：将已经除去杂质的步骤（2）获得的具有高氧含量的钽粉末与第三还原剂粉末均匀混合，然后在氢气和/或 惰性气体或真空气氛，得到适合电容器的钽金属粉末; 其中在每个还原步骤之后，从反应产物中除去还原剂和剩余还原剂的氧化产物。

公开(公告)号：US20100326239A1

公开(公告)日：2010-12-30

申请号：US12818379

申请日：2010-06-18

申请人： Wenfeng SHI ,  Xueqing Chen ,  Yong Li ,  Xudong Xi ,  Tao Guo

发明人： Wenfeng SHI ,  Xueqing Chen ,  Yong Li ,  Xudong Xi ,  Tao Guo

IPC分类号： B22F9/20 ,  B22F1/00

CPC分类号： C01G35/00 ,  B22F9/20 ,  B22F2998/10 ,  B22F2999/00 ,  C01P2004/03 ,  C01P2004/62 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/40 ,  H01G9/0029 ,  H01G9/0525 ,  B22F2201/013 ,  B22F2201/20 ,  B22F2201/10 ,  B22F1/0096

摘要： The present invention provides a process for preparing a tantalum powder with high specific capacity, which process comprising the steps of, in sequence, (1) a first reduction step: mixing tantalum oxide powder and a first reducing agent powder homogenously, and then carrying out reduction reaction in hydrogen and/or inert gas or vacuum atmosphere to obtain a tantalum suboxides powder; (2) a second reduction step: mixing the tantalum suboxides powder obtained from the step (1), in which impurities have been removed, and a second reducing agent powder homogenously, and then carrying out reduction reaction in hydrogen and/or inert gas or vacuum atmosphere to obtain a tantalum powder having high oxygen content; (3) a third reduction step: mixing the tantalum powder having high oxygen content obtained from the step (2), in which impurities have been removed, with a third reducing agent powder homogenously, and then carrying out reduction reaction in hydrogen and/or inert gas or vacuum atmosphere to obtain a tantalum metal powder suitable for capacitors; wherein after each reduction step, the oxidation product of reducing agent and the residual reducing agent are removed from the reaction product.

摘要翻译： 本发明提供一种制备高比容量的钽粉的方法，该方法包括以下步骤：（1）第一还原步骤：均匀混合氧化钽粉末和第一还原剂粉末，然后进行 在氢气和/或惰性气体或真空气氛中还原反应，得到低氧化钽粉末; （2）第二还原步骤：将其中除去杂质的步骤（1）获得的低密度氧化钡粉末和均质的第二还原剂粉末混合，然后在氢气和/或惰性气体中进行还原反应，或 真空气氛，得到氧含量高的钽粉末; （3）第三还原步骤：将已经除去杂质的步骤（2）获得的具有高氧含量的钽粉末与第三还原剂粉末均匀混合，然后在氢气和/或 惰性气体或真空气氛，得到适合电容器的钽金属粉末; 其中在每个还原步骤之后，从反应产物中除去还原剂和剩余还原剂的氧化产物。

公开(公告)号：US07727508B2

公开(公告)日：2010-06-01

申请号：US12196492

申请日：2008-08-22

申请人： Wenfeng Shi ,  Xudong Xi ,  Yong Li ,  Xueqing Chen ,  Wei Wang

发明人： Wenfeng Shi ,  Xudong Xi ,  Yong Li ,  Xueqing Chen ,  Wei Wang

IPC分类号： C01G33/00

CPC分类号： C01G33/00 ,  B22F9/20 ,  B22F2998/10 ,  C01P2004/03 ,  C01P2006/10 ,  C01P2006/40 ,  C01P2006/80 ,  B22F1/0003 ,  B22F1/0085

摘要： The present invention relates to a process for preparing powders of niobium suboxides or niobium, wherein the process comprising: mixing the niobium oxides as raw material with reducing agent, conducting a reaction at a temperature in the range of 600˜1300° C. in an atmosphere of vacuum or inert gas or hydrogen gas, leaching the reaction product to remove the residual reducing agent and the oxides of the reducing agent and other impurities, heat treating at a temperature of the range of 1000˜1600° C. in an atmosphere of vacuum or inert gas, and screening to obtain the powders of niobium suboxide or niobium of capacitor grade. According to the present invention, the niobium oxides were directly reduced into capacitor grade niobium suboxides or niobium with reducing agents which can be easily removed by mineral acids, wherein the speed of the reaction can be controlled and the reaction can directly reduce the niobium oxides into capacitor grade niobium suboxides or niobium powder. According to the present invention, the process is simple with high yield and high productivity. The products obtained have good flowability, low impurities, uniform distribution of oxygen, and have good electrical properties.

摘要翻译： 本发明涉及一种制备低氧化铌或铌粉末的方法，其中所述方法包括：将作为原料的铌氧化物与还原剂混合，在600〜1300℃的温度范围内进行反应 气氛中的真空或惰性气体或氢气，浸出反应产物以除去残留的还原剂和还原剂的氧化物等杂质，在1000〜1600℃的温度范围内进行热处理，在 真空或惰性气体，并筛选得到电容器级的低氧化铌或铌粉末。 根据本发明，铌氧化物通过还原剂直接还原成电容器级铌低氧化物或铌，其可以通过无机酸容易地除去，其中可以控制反应速度，反应可以直接将铌氧化物还原成 电容器级铌粉或铌粉。 根据本发明，该方法简单，产率高，生产率高。 所得产品流动性好，杂质低，氧分布均匀，电性能好。