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Title:
METHOD FOR PRODUCING TANTALUM POWDER FOR CAPACITOR BY REDUCING TANTALUM OXIDE USING ALKALINE EARTH METAL
Document Type and Number:
WIPO Patent Application WO/2023/109170
Kind Code:
A1
Abstract:
A method for producing tantalum powder for a capacitor by reducing tantalum oxide using an alkaline earth metal, comprising the following steps: 1) mixing tantalum oxide with an excessive alkaline earth metal reducing agent magnesium, simultaneously mixing at least one alkali metal or alkaline earth metal halide accounting for 10-200% of the weight of tantalum oxide, and in a heating furnace filled with an inert gas, heating the obtained mixture to a temperature of 700-1200°C, and then maintaining the temperature for 1 h to 10 h, so that the tantalum oxide and the reducing agent fully undergo a reduction reaction; 2) after the temperature maintaining is finished, cooling to 600-800°C, vacuumizing the heating furnace to below 10 Pa, and maintaining the negative pressure for 1 h to 10 h, so that the excess metal magnesium is separated from the tantalum powder mixture; 3) then, under an inert gas, increasing the temperature of the heating furnace to a temperature of 750-1200°C, preferably 900-1050°C, and then maintaining the temperature for 1 h to 6 h, so that the tantalum powder is further sintered in molten salt; 4) then cooling to room temperature and performing passivation treatment to obtain a mixed material containing halide and tantalum powder; and 5) separating the tantalum powder from the obtained mixture.

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Inventors:
CHENG YUEWEI (CN)
ZHENG JINFENG (CN)
LIANG HONGYUAN (CN)
GUO SHUN (CN)
MA HAIYAN (CN)
ZUO JINGYI (CN)
ZHANG LI (CN)
QIN HONGJIE (CN)
LIU TONG (CN)
WANG YING (CN)
Application Number:
PCT/CN2022/114372
Publication Date:
June 22, 2023
Filing Date:
August 24, 2022
Export Citation:
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Assignee:
NINGXIA ORIENT TANTALUM IND CO LTD (CN)
International Classes:
B22F9/20; C22B5/04; C22B34/24
Foreign References:
CN114192791A2022-03-18
CN114210973A2022-03-22
US3415639A1968-12-10
CN1410209A2003-04-16
US5242481A1993-09-07
US20030070509A12003-04-17
JP2003013115A2003-01-15
CN1308566A2001-08-15
CN99808374A1999-05-05
CN105033283A2015-11-11
CN201510310262A1999-05-05
CN1251325A2000-04-26
CN201110039272A2011-02-14
CN201120077798U2011-03-23
CN201120077680U2011-03-23
CN201120077305U2011-03-23
CN201420777210U2014-12-10
CN201210548101A2012-12-18
CN201280077499A2012-12-18
CN201210548008A2012-12-18
Attorney, Agent or Firm:
CCPIT PATENT AND TRADEMARK LAW OFFICE (CN)
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