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Preparation method of niobium pentoxide with small tap density

A niobium pentoxide, solid density technology, applied in the preparation of niobium compounds, chemical instruments and methods, inorganic chemistry and other directions, can solve problems such as inability to meet industrial needs

Active Publication Date: 2022-03-15
江门富祥电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The tap density of niobium oxide prepared according to the current process is about 0.9g / cm3, which cannot meet the needs of industry

Method used

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  • Preparation method of niobium pentoxide with small tap density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1.1: Put 1000L fluoroniobic acid (H2NbF7) into the neutralization tank, add pure water to dilute the fluoroniobic acid (H2Nb7 content = 110g / l) to 45g / l, stir well for 20 minutes, then slowly open the ammonia gas valve Introduce ammonia gas, and adjust the pressure of ammonia gas to neutralize for the first time to pH = 5-6, and the neutralization time is 20 minutes to control that no white precipitate occurs.

[0028] 1.2: Cool to 20~40℃

[0029] 1.3: For the second neutralization, cool down to 20-40°C fluoroniobic acid, and after fully stirring for 20 minutes, slowly open the ammonia gas valve to let in ammonia gas, and control the neutralization time to 5 minutes by adjusting the pressure and flow rate of ammonia gas to obtain Niobium hydroxide slurry;

[0030] 2.1: Transfer the niobium hydroxide material obtained by secondary neutralization and precipitation to a washing bucket capable of vacuuming, and vacuum filter while stirring until no liquid can be seen on th...

Embodiment 2

[0037] The preparation of niobium pentoxide with little tap density of embodiment 2

[0038] 1.1: Put 1050L of fluoroniobic acid (H2Nb7) into the neutralization tank, add pure water to dilute the fluoroniobic acid (H2NbF7 content = 105g / l) to 85g / l, stir thoroughly for 20 minutes, then slowly open the ammonia valve Introduce ammonia gas, and adjust the pressure of ammonia gas to neutralize for the first time to pH = 5-6, and the neutralization time is 40 minutes to control that there is no white precipitate.

[0039] 1.2: Cool to 20~40℃

[0040] 1.3: For the second neutralization, cool down to 20-40°C fluoroniobic acid, and after fully stirring for 20 minutes, slowly open the ammonia gas valve to let in ammonia gas, and control the neutralization time to 30 minutes by adjusting the pressure and flow of ammonia gas to obtain Niobium hydroxide slurry;

[0041] 2.1: Transfer the niobium hydroxide material obtained by secondary neutralization and precipitation to a washing bucke...

Embodiment 3

[0049] 1.1: Put 1020L fluoroniobic acid (H2NbF7) into the neutralization tank, add pure water to dilute the fluoroniobic acid (H2NbF7 content = 108 / g / l) to 65g / l, stir thoroughly for 20 minutes, then slowly open the ammonia Ammonia gas is fed through the air valve, and the first neutralization is carried out to pH=5-6 by adjusting the pressure of ammonia gas, and the neutralization time is 30 minutes to control that no white precipitate occurs.

[0050] 1.2: Cool to 20~40℃

[0051] 1.3: For the second neutralization, cool down to 20-40°C fluoroniobic acid, and after fully stirring for 20 minutes, slowly open the ammonia gas valve to let in ammonia gas, and control the neutralization time to 30 minutes by adjusting the pressure and flow of ammonia gas to obtain Niobium hydroxide slurry;

[0052] 2.1: Transfer the niobium hydroxide material obtained by secondary neutralization and precipitation to a washing bucket capable of vacuuming, and vacuum filter while stirring until no ...

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Abstract

The invention discloses a preparation method of niobium pentoxide with small shaking density. The preparation method comprises the following steps: secondary neutralization, precipitate washing, drying, calcining and grinding and screening. According to the preparation method disclosed by the invention, by adjusting and optimizing process conditions, on one hand, the particle size distribution of the prepared niobium oxide real particles is uniform, so that the agglomeration of the real particles is reduced; on the other hand, the aggregation of the real particles is reduced by diluting the fluoroniobic acid (H2Nb7) to a certain concentration before neutralization and precipitation, controlling the neutralization time and controlling the washing conditions, and the aggregation effect of the real particles is reduced by changing a screen mesh from 60 meshes to 80 meshes during screening, so that the generation of the granularity of false particles is reduced, and the requirement of reducing the density is met.

Description

technical field [0001] The invention relates to the field of printing and dyeing equipment, in particular to a method for preparing niobium pentoxide with a small tap density. Background technique [0002] The good dielectric properties of niobium pentoxide make it widely used in the production process of various ceramic capacitors. Niobium oxide electrolytic capacitors are highly resistant to short-circuit failure mechanisms, and the oxide base significantly improves thermal damage resistance after dielectric breakdown. Thin-film niobium oxide materials can be used to produce resistance-capacitance elements of integrated circuits. Niobium pentoxide is also a material for the manufacture of special optical glass, which can achieve high refractive index and low dispersion. Compared to metallic tantalum or niobium capacitors, with or without a polymer electrolyte system, niobium oxide electrolytic capacitors offer a true "no burn" technology. Niobium can not only form oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
CPCC01G33/003C01P2006/11C01P2006/80
Inventor 蔡毅郑祥云任永前
Owner 江门富祥电子材料有限公司
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