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Production method of vanadium trioxide

A vanadium trioxide and production method technology, which is applied in the direction of vanadium oxide, etc., can solve the problems of high manufacturing and production costs of reduction equipment, difficulty in meeting large-scale industrial production, and complex production processes, so as to shorten the reduction time and save consumption , the effect of high purity

Inactive Publication Date: 2010-09-01
CHANGSHA SYNO THERM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the reduction temperature is high, the required amount of industrial gas is high, and the high-temperature materials in the production equipment will increase the carbon content in the product due to catalysis, which will affect the quality of subsequent products.
The disadvantage of this method is that it needs to be reduced under high pressure for as long as 4 hours, and the requirements for equipment are relatively high.
The disadvantages of this method are: high reduction temperature, long reduction time and high cost
The disadvantage of this method is that the reduction temperature is higher and the reduction time is longer
The disadvantages of this method are: long reduction time, large consumption of ammonia gas, high cost, and risk of leakage
[0008] The above-mentioned existing technologies all need a large amount of external reducing agent in the heating process, and the reducing agent used is a relatively pure gas, which is generally limited to laboratory or small-scale production, and it is difficult to meet large-scale industrial production, making it industrially applicable. Restricted, and the production process is complicated, and the production and production costs of reduction equipment are high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: 1 kg of ammonium metavanadate is placed in an industrial batch microwave oven, the microwave frequency is 915 MHz, heated to 800 ° C for 5 minutes at a heating rate of 5 ° C to 10 ° C / min under normal pressure, and the protective gas is Argon. Adopt the thermocouple temperature measurement method, turn off the microwave source, and then cool down to below 180°C with the furnace to get the vanadium trioxide powder. The obtained vanadium trioxide is a black powder, loose and porous, and from the XRD analysis results, the product is a pure phase V 2 o 3 . The ratio after oxidation is used to characterize the content of vanadium, the larger the ratio, the higher the vanadium content (V 2 o 5 / V 2 o 3 Theoretical value is 1.21), and its oxidation ratio ratio (V 2 o 5 / V 2 o 3 ) is 1.209. The recovery rate of vanadium is greater than 99.5%.

Embodiment 2

[0019] Example 2: A certain amount of ammonium polyvanadate was continuously put into an industrial continuous microwave oven with a microwave frequency of 2.45 GHz, and an infrared thermometer was used to measure the temperature, and the protective gas was a mixed gas of argon-nitrogen. Heating under normal pressure makes the high temperature zone in the furnace reach 600°C, allowing the material to pass through this temperature zone to undergo a reduction reaction for 60 minutes, and cool the charge to below 100°C to obtain vanadium trioxide. The obtained vanadium trioxide is black, and from the XRD analysis results, the product is pure phase V 2 o 3 . From the SEM photos, the crystal shape is dumbbell-shaped, the size is about 2 μm, and the crystal grains are uniform. The obtained grade of vanadium trioxide is greater than 99.7%, and the recovery rate of vanadium is greater than 99.5%.

Embodiment 3

[0020] Example 3: A certain amount of ammonium metavanadate was continuously put into an industrial continuous microwave oven with a microwave frequency of 2.45 GHz, a thermocouple was used for temperature measurement, and the protective gas was nitrogen. Heating under normal pressure makes the high temperature zone in the furnace reach 900°C, allowing the material to pass through this temperature zone to undergo a reduction reaction for 30 minutes, and cool the charge to below 100°C to obtain vanadium trioxide. The obtained vanadium trioxide is black, and from the XRD analysis results, no other miscellaneous peaks appear, and the product is pure phase V 2 o 3 , as in the XRD pattern at 800 °C, no lower vanadium oxy compounds appear. The measured oxidation ratio ratio (V 2 o 5 / V 2 o 3 ) is 1.208. The obtained grade of vanadium trioxide is greater than 99.7%, and the recovery rate of vanadium is greater than 99.5%.

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Abstract

The invention discloses a production method of vanadium trioxide, comprising the following steps: heating in a reducing atmosphere or under inert gas protection at the temperature of 600-900 DEG C, and keeping reduction time for 5-60 minutes; and naturally cooling or forcibly cooling under an isolated air condition. The method has the advantages that amino-containing vanadate is taken as a raw material and heated by industrial microwave, and an appropriate amount of reductant can be added or not, thus greatly saving usage amount of the reductant, shortening reduction time, reducing reduction temperature, simplifying production process, lowering production cost, and obtaining high-purity vanadium trioxide.

Description

technical field [0001] The invention belongs to the production technology of vanadium oxide, in particular to a production method of powdery vanadium trioxide. Background technique [0002] Vanadium trioxide is widely used in heat-sensitive and gas-sensitive temperature sensors and magnetic switches, and is also a raw material for the preparation of ferrovanadium, vanadium-nitrogen compounds and chemical catalysts. Manufactured from vanadium oxide. The method for producing vanadium trioxide is generally obtained in the prior art by using a direct reduction method with an external reducing agent, which is decomposed and reduced under high temperature or high temperature and high pressure. Usually vanadium pentoxide, ammonium metavanadate or ammonium polyvanadate are used as raw materials, and the reducing agents used include pure hydrogen, ammonia, methane, carbon monoxide or industrial coal. Because the reducing gas is not easy to obtain and the price is relatively expensi...

Claims

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Application Information

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IPC IPC(8): C01G31/02
Inventor 彭虎夏广斌杨军
Owner CHANGSHA SYNO THERM
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