A kind of preparation method of niobium pentoxide with high bulk density

A technology of niobium pentoxide and bulk density, which is applied in chemical instruments and methods, inorganic chemistry, niobium compounds, etc., can solve the problems of not being able to prepare niobium pentoxide, achieve high bulk density, and do not pollute the environment

Active Publication Date: 2021-01-26
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technical scheme can increase the bulk density of niobium pentoxide to 1.0-1.8g / cm 3 , but cannot prepare bulk density of 2.0g / cm 3 niobium pentoxide above

Method used

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  • A kind of preparation method of niobium pentoxide with high bulk density

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Experimental program
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Effect test

Embodiment 1

[0033] The invention provides a method for preparing niobium pentoxide with high bulk density, comprising the following steps:

[0034] (1) Obtain fluoroniobic acid solution by extraction and separation method, neutralize with ammonia, wash to remove fluoride and dry at 200°C to obtain niobium hydroxide powder, put the niobium hydroxide powder into a steel mold, press pressure: 400MPa, keep Press for 10s;

[0035] (2) Put the compact into the calcination furnace at a temperature of 900°C for 8 hours, and the following reactions occur during calcination:

[0036] 2Nb(HO) 5 =Nb 2 o 5 +5H 2 O↑

[0037] Niobium hydroxide is converted into niobium pentoxide by calcination. During the process, about 25% of moisture and other volatiles escape from the pressed embryo, causing the embryo to crack and loose, which is conducive to subsequent crushing and screening;

[0038] (3) Grind and sieve the niobium oxide green block with a stainless steel mill and sieve with a 40-mesh screen...

Embodiment 2

[0040] The invention provides a method for preparing niobium pentoxide with high bulk density, comprising the following steps:

[0041] (1) Obtain oxyfluoroniobic acid solution by extraction and separation, neutralize with ammonia, wash to remove fluoride and dry at 300°C to obtain niobium hydroxide powder, and put the niobium hydroxide powder into a soft mold with an inner diameter of ￠37×600mm , cold isostatic pressing, pressure 220MPa, holding pressure 20min;

[0042] (2) Put the compact into the calciner, the temperature is 850°C, the time is 6h, the following reaction occurs during calcining:

[0043] 2Nb(HO) 5 =Nb 2 o 5 +5H 2 O↑

[0044] Niobium hydroxide is converted into niobium pentoxide by calcination. During the process, about 25% of moisture and other volatiles escape from the pressed embryo, causing the embryo to crack and loose, which is conducive to subsequent crushing and screening;

[0045] (3) Grind and sieve the niobium oxide green block with a stainle...

Embodiment 3

[0047] The invention provides a method for preparing niobium pentoxide with high bulk density, comprising the following steps:

[0048] (1) Obtain fluoroniobic acid solution by extraction and separation method, neutralize with ammonia, wash to remove fluoride and dry at 100°C to obtain niobium hydroxide powder, put the niobium hydroxide powder into a soft mold with an inner diameter of ￠37×600mm, Cold isostatic pressing, pressure 250MPa, pressure hold 30min;

[0049] (2) Put the compact into the calcination furnace at a temperature of 900°C for 8 hours, and the following reactions occur during calcination:

[0050] 2Nb(HO) 5 =Nb 2 o 5 +5H 2 O↑

[0051] Niobium hydroxide is converted into niobium pentoxide by calcination. During the process, about 25% of moisture and other volatiles escape from the pressed embryo, causing the embryo to crack and loose, which is conducive to subsequent crushing and screening;

[0052](3) Grind and sieve the niobium oxide block with a stain...

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Abstract

The invention discloses a method for preparing niobium pentoxide with high bulk density, which belongs to the field of rare metal tantalum and niobium smelting. The method comprises: (1) loading niobium hydroxide powder into a die, and pressing to obtain a compact; (2) ) Calcining and decomposing the compact to make niobium oxide block; (3) crushing the niobium oxide block and sieving to obtain a bulk density of 2.0g / cm 3 The niobium pentoxide powder above. The present invention adopts steel mold pressing or soft mold isostatic pressing, the volume is greatly compressed, and the capacity of the calcination furnace can be nearly doubled, and the same calcination conditions can save energy consumption by nearly half. The green compacts are decomposed into niobium pentoxide by calcination, and about 25% of moisture and other volatiles escape from the green compacts during the calcining process, causing the embryo blocks to crack, loose and easy to break. The method of the present invention does not add reagents, does not affect the purity, and does not pollute the environment; the crushed powder is sieved to obtain a bulk density ≥ 2.0g / cm 3 of niobium pentoxide.

Description

technical field [0001] The invention belongs to the field of rare metal tantalum and niobium smelting, and in particular relates to a method for preparing niobium pentoxide with high bulk density. Background technique [0002] Niobium pentoxide is the raw material for the production of niobium metal and its alloys, niobium carbide, electronic ceramics, niobium capacitors, lithium niobate single crystal, optical glass and niobium oxide sputtering targets. With the rapid development of science and technology, niobium oxide The uses of niobium are constantly expanding, and different uses have different requirements for their chemical purity, and also have different requirements for their bulk density, such as making targets and niobium capacitors that require high bulk density. [0003] The niobium pentoxide after the fluoroniobic acid (or oxyfluoroniobic acid) solution obtained by liquid-liquid extraction separation method is neutralized with ammonia, washed, dried and calcine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G33/00
CPCC01G33/00C01P2006/90
Inventor 万明远刘银元李韧
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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