Preparation method of phosphorus-containing tantalum powder

A technology of tantalum powder and phosphoric acid, which is applied in chemical instruments and methods, tantalum compounds, inorganic chemistry, etc., can solve the problem of uneven phosphorus doping, and achieve the effect of large specific surface area and high specific volume

Inactive Publication Date: 2014-02-26
NINGXIA ORIENT TANTALUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] As mentioned above, although the existing methods for making tantalum metal powder introduce several methods to increase the phosphorus content in tantalum powder, these phosphorus doping methods will cause the problem of uneven phosphorus doping

Method used

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  • Preparation method of phosphorus-containing tantalum powder
  • Preparation method of phosphorus-containing tantalum powder
  • Preparation method of phosphorus-containing tantalum powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Firstly, during the production process of potassium fluorotantalate, the tantalum solution flowing out after extraction was sampled and analyzed. After testing, the concentration of the tantalum solution was 50g / l and the acidity was 0.9mol / l. Then put the tantalum liquid into the blow-off tank, and blow off with compressed air. The purpose of blow-off is to float part of the organic gas phase dissolved in the tantalum liquid to the upper layer of the solution in the blow-off tank, which can effectively reduce the final Carbon content in potassium fluorotantalate, stripping time 6h. Pour 1000L of the stripped tantalum liquid into the synthesis tank for synthesis, where the effective volume of the synthesis tank is 1300L. Add potassium chloride according to formula (1).

[0051] Add potassium chloride 40Kg in this embodiment. Then open the stirring paddle, add 53 liters of HF, the concentration of HF in the reaction solution after adding HF is about 1.3mol / l, add H 3 ...

Embodiment 2

[0054] Firstly, during the production process of potassium fluorotantalate, the tantalum solution flowing out after extraction was sampled and analyzed. After testing, the concentration of the tantalum solution was 50g / l and the acidity was 0.9mol / l. Then put the tantalum liquid into the blow-off tank, and blow off with compressed air. The purpose of blow-off is to float part of the organic gas phase dissolved in the tantalum liquid to the upper layer of the solution in the blow-off tank, which can effectively reduce the final Carbon content in potassium fluorotantalate, stripping time 6h. Pour 1000L of the stripped tantalum liquid into the synthesis tank for synthesis, where the effective volume of the synthesis tank is 1300L. Add potassium chloride according to formula (1).

[0055] Add potassium chloride 40Kg in this embodiment. Then open the stirring paddle, add 53 liters of HF, the concentration of HF in the reaction solution after adding HF is about 1.3mol / l, add H 3 ...

Embodiment 3

[0058] Firstly, during the production process of potassium fluorotantalate, the tantalum solution flowing out after extraction was sampled and analyzed. After testing, the concentration of the tantalum solution was 50g / l and the acidity was 0.9mol / l. Then put the tantalum liquid into the blow-off tank, and blow off with compressed air. The purpose of blow-off is to float part of the organic gas phase dissolved in the tantalum liquid to the upper layer of the solution in the blow-off tank, which can effectively reduce the final Carbon content in potassium fluorotantalate, stripping time 6h. Pour 1000L of the stripped tantalum liquid into the synthesis tank for synthesis, where the effective volume of the synthesis tank is 1300L. Add potassium chloride according to formula (1).

[0059] Add potassium chloride 40Kg in this embodiment. Then open the stirring paddle, add 53 liters of HF, the concentration of HF in the reaction solution after adding HF is about 1.3mol / l, add H 3 ...

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Abstract

The invention relates to a preparation method of a phosphorus-containing tantalum powder and a phosphorus-containing tantalum powder prepared by the method, and a preparation method of phosphorus-containing potassium tantalifluoride and phosphorus-containing potassium tantalifluoride prepared by the method. According to the method, a phosphorus-containing compound is added into a potassium tantalifluoride synthesis solution, and an acid leaching process is utilized to synthesize the potassium tantalifluoride from columbite-tantalite ore powder; and the phosphorus-containing potassium tantalifluoride is prepared into the phosphorus-containing tantalum powder. The phosphorus doping process of the phosphorus-containing tantalum powder is performed in the potassium tantalifluoride synthesis process, so the phosphorus is distributed more uniformly on the tantalum powder particles; since the phosphorus is doped in the potassium tantalifluoride synthesis process, the generation of primary particles is directly influenced; and thus, the primary particles are finer and have larger specific area, and the tantalum powder has higher specific capacity, thereby satisfying the requirement of the capacitor product for the specific capacity of the tantalum powder.

Description

technical field [0001] The invention belongs to the field of tantalum metal production, and in particular relates to a preparation method of phosphorus-containing tantalum powder and phosphorus-containing tantalum powder prepared by the method, and also relates to a preparation method of phosphorus-containing potassium fluorotantalate and a phosphorus-containing potassium tantalate prepared by the method. Potassium Phosphofluorotantalate. Background technique [0002] Metal tantalum is a valve metal, which can form a dense oxide film on the surface and has the property of unidirectional conductivity. The anode film made of tantalum powder has stable chemical properties (especially in acidic electrolyte), high resistivity (7.5×1010Ω cm), large dielectric constant (27.6), small leakage current, and has a wide operating temperature range (-80~200℃), high reliability, shock resistance and long service life. Therefore, tantalum powder is an ideal material for making tantalum ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G35/00
Inventor 杨国启郑爱国王东新罗文郭涛张丽任萍
Owner NINGXIA ORIENT TANTALUM IND
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