Method and device for preparing tantalum powder by stirring sodium and reducing potassium fluotantalate

A technology of potassium fluorotantalate and stirring device, which is applied in the field of tantalum powder preparation, which can solve the problems of uneven injection of sodium metal and achieve uniform distribution

Active Publication Date: 2010-11-10
江门富祥电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a new method and corresponding de

Method used

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  • Method and device for preparing tantalum powder by stirring sodium and reducing potassium fluotantalate
  • Method and device for preparing tantalum powder by stirring sodium and reducing potassium fluotantalate
  • Method and device for preparing tantalum powder by stirring sodium and reducing potassium fluotantalate

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Embodiment 1

[0052] According to the inventive method, the potassium fluorotantalate of 250kg, the sodium chloride of 100kg are packed into such as figure 2 In the shown reaction device, cover the reaction vessel cover 2 and then seal and evacuate until the pressure is lower than 150 Pa, then fill it with argon, lift the reaction vessel 1 into the electric furnace 11 for heating, and start stirring when the temperature of the material rises to 900°C The device is stirred, and the stirring paddle 42 is lowered into the melt composed of potassium fluorotantalate and potassium chloride, the stirring speed is 80 RPM, and the temperature is kept at 900° C. for 1 hour. Since the reduction of potassium fluorotantalate by sodium is an intense exothermic process, stop the external heating when injecting sodium, and blow air through the blower 12 to cool the reaction vessel, then inject liquid metal sodium into the reaction vessel, and pass the sodium injection speed and cooling. Speed ​​is used to...

Embodiment 2

[0058] According to the inventive method, 80kg sodium chloride, 100kg Repone K, 30kg Potassium Fluoride and a small amount of well-known grain refiner are packed into such as figure 2 In the shown reaction vessel 1, cover the reaction vessel cover 2 and evacuate until the pressure is lower than 150 Pa, then fill it with argon, lift the reaction vessel 1 into the heating furnace 11 for electric heating, when the material rises to 830°C At this time, the stirring paddle is started to stir, and it is lowered into the melt 10, the stirring speed is 100PRM, and it is kept at 830° C. for 1 hour. Add 30KG potassium fluorotantalate, stop heating, inject sodium, and cool reaction vessel 1 by blowing air, and control the temperature to 830°C±10°C through sodium injection speed and cooling speed, so that potassium fluorotantalate-injection sodium is added alternately, every After injecting 25kg of sodium, lift up the stirring blade by 4cm, add 90kg of potassium fluorotantalate in total,...

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Abstract

The invention discloses a device for preparing tantalum powder by stirring sodium and reducing potassium fluotantalate, which comprises a reaction vessel and a reaction vessel cover, wherein the reaction vessel is hermetically sealed with the reaction vessel cover; the reaction vessel cover is provided with a plurality of through holes; the through holes are respectively provided with a thermocouple, a stirring apparatus and a sodium injection tube; the reaction vessel cover is further provided with a feed inlet, an air inlet and an air outlet; and the reaction vessel is provided with a sodium distributor. The invention further discloses a method for preparing the tantalum powder using the device. In the invention, metal sodium is injected into the reaction vessel in a dispersive manner by the sodium distributor, and the prepared tantalum powder has uniformly-distributed elementary particles.

Description

technical field [0001] The invention belongs to the field of tantalum powder preparation methods, and in particular relates to a method and a corresponding device for preparing tantalum powder by reducing potassium fluorotantalate by changing the sodium injection method. Background technique [0002] Metal tantalum powder, the dense oxide film formed on the surface of the powder has the property of one-way conductive valve metal. The produced anode film has stable chemical properties (especially stable in acidic electrolyte), high resistivity (7.5×1010Ω·cm), high dielectric constant (27.6), and low leakage current. It also has the advantages of wide working temperature range (-80~200℃), high reliability, shock resistance and long service life. [0003] Sodium reduction of potassium fluorotantalate is an important method for preparing tantalum powder, especially the main method for preparing high specific volume tantalum powder. It has been about 40 years since Helier Marti...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 郑祥云朱德忠郑浩宇何文礼杨进
Owner 江门富祥电子材料有限公司
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