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Method for preparing large apparent density tantalum oxide

A bulk density, tantalum oxide technology, applied in chemical instruments and methods, inorganic chemistry, tantalum compounds, etc., can solve the problem of low bulk density characteristics of products, and achieve the effects of easy operation, stable process technology, and good application performance

Inactive Publication Date: 2019-08-23
JIUJIANG TANBRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing tantalum oxide with a large bulk density, which solves the problem of low bulk density characteristics of the products prepared in the prior art

Method used

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  • Method for preparing large apparent density tantalum oxide
  • Method for preparing large apparent density tantalum oxide
  • Method for preparing large apparent density tantalum oxide

Examples

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preparation example Construction

[0021] A kind of preparation method of large bulk density tantalum oxide, such as figure 2 As shown, the method includes the following steps:

[0022] (1), ammonia neutralization:

[0023] The ammonia neutralization step is carried out in the ammonia neutralization sedimentation tank;

[0024] Transfer the low-content fluorotantalic acid solution into the ammonia neutralization precipitation tank, start the stirring paddle at a speed of 10-25 rpm, open the gas ammonia valve and add gas ammonia, neutralize to pH=3.5-4.5, and obtain Fluorotantalic acid neutralizing solution;

[0025] (2), adding seeds:

[0026] The step of adding seed crystals is carried out in ammonia neutralization precipitation tank;

[0027] With the fluorotantalic acid neutralization solution obtained in step I, in the ammonia neutralization precipitation tank, add tantalum hydroxide crystal seed, fluorotantalic acid feed liquid: tantalum hydroxide crystal seed=100:5~10 (with Ta 2 o 5 meter), and the...

Embodiment 1

[0049] 1. Ammonia neutralization:

[0050] (1) 1500L of low-content fluorotantalic acid solution, the oxide concentration is determined by Ta 2 o 5 Calculated as 13.2g / L, the amount of oxides is Ta 2 o 5 Gauge = 19.8kg, put into ammonia neutralization and sedimentation tank;

[0051] (2) In the ammonia neutralization settling tank, start the stirring paddle at a speed of 15 rpm, open the gas ammonia valve and add gas ammonia, neutralize to pH=4.0, and form a fluorotantalic acid neutralization solution.

[0052] 2. Adding seeds:

[0053] In the ammonia neutralization precipitation tank, add tantalum hydroxide seed crystal, press fluorotantalic acid feed liquid: tantalum hydroxide crystal seed=100:8 (with Ta 2 o 5 Calculated by adding tantalum hydroxide seed crystal 1.58kg (Ta 2 o 5 meter), and the stirring time was 45 minutes to obtain a mixture of tantalum fluoride and tantalum hydroxide; the amount of oxide was expressed as Ta 2 o 5 Total = 21.38kg.

[0054] 3. Ammon...

Embodiment 2

[0070] 1. Ammonia neutralization:

[0071] (1) 1430L of low-content fluorotantalic acid solution, the oxide concentration is determined by Ta 2 o 5 Calculated as 11.7g / L, the amount of oxides is Ta 2 o 5 Gauge = 16.73kg, put into ammonia neutralization and sedimentation tank;

[0072] (2) In the ammonia neutralization settling tank, start the stirring paddle at a speed of 15 rpm, open the gas ammonia valve and add gas ammonia, neutralize to pH = 4.0, and form a fluorotantalic acid neutralization solution.

[0073] 2. Adding seeds:

[0074] In the ammonia neutralization precipitation tank, add tantalum hydroxide seed crystal, press fluorotantalic acid feed liquid: tantalum hydroxide crystal seed=100:8 (with Ta 2 o 5 Calculated by adding tantalum hydroxide seed crystal 1.34kg (in Ta 2 o 5 meter), and the stirring time was 45 minutes to obtain a mixture of tantalum fluoride and tantalum hydroxide; the amount of oxide was expressed as Ta 2 o 5 Total = 18.07kg.

[0075] ...

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Abstract

The invention discloses a method for preparing large apparent density tantalum oxide. The method comprises the following steps: (1) carrying out ammonia neutralization; (2) adding a crystal seed; (3)carrying out ammonia sedimentation; (4) carrying out filter pressing and washing; (5) carry out drying; (6) carrying out calcining and screening; and (7) detecting product properties. Not only are thecontents of main components, but also contents of different impurities of the large apparent density tantalum oxide product prepared by using the method are prior to provisions of a product brand FTa2O5-2 in the industry standard Tantalum Pentoxide YS / T 427-2012, and the apparent density of the product is up to 1.5-1.8g / cm<3>.

Description

technical field [0001] The invention relates to a method for preparing tantalum oxide with large bulk density. Background technique [0002] Tantalum belongs to group VB in the periodic table of chemical elements, and its atomic number is 73. [0003] In the prior art, the preparation of tantalum oxide usually uses niobium ore with low tantalum content as raw material, undergoes mixed acid decomposition of hydrofluoric acid and sulfuric acid, secondary octanol-HF-H 2 SO 4 Extraction and separation of tantalum and other impurity elements in the system, ammonia neutralization and precipitation of fluorotantalic acid solution, pressure filtration washing, drying and calcination and screening process to produce tantalum oxide, see the process flow figure 1 . In the current industry standard "Tantalum Pentoxide" YS / T 427-2012, the product grade of tantalum oxide is FTa 2 o 5 -2, where F means powder, Ta 2 o 5 Indicates tantalum pentoxide (Ta 2 o 5 ), the molecular formul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G35/00
CPCC01G35/00C01P2006/10C01P2006/80
Inventor 岑端国戴和平张浩钟文生
Owner JIUJIANG TANBRE