Method for preparing nanometer molybdenum trioxide

Abstract

The invention relates to the technical field of nonferrous metallurgy, in particular to a method for preparing nanometer molybdenum trioxide and using pure molybdenum trioxide as a raw material. The pure molybdenum trioxide is used as the raw material, the nanometer molybdenum trioxide is prepared by means of plasma sublimation, pure molybdenum trioxide powder is fed into a plasma subliming furnace via a feeding device and is sublimed in plasma flow, operation time ranges from 10ms to 100ms, obtained gaseous molybdenum trioxide is in shock cooling by the aid of shock cooling media and collected by a receiving device, the nanometer molybdenum trioxide is obtained, and content of MoO3 is higher than 99.80%. The molybdenum trioxide is prepared by the aid of a plasma sublimation method, the high-purity nanometer molybdenum trioxide with the granularity within 80nm can be obtained in a super-short time period, and automatic and continuous production is truly realized.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a method for preparing nanometer molybdenum trioxide by using pure molybdenum trioxide as a raw material. Background technique [0002] Molybdenum trioxide is the most important intermediate in molybdenum metallurgy. Most molybdenum compounds are directly or indirectly made from it. Molybdenum trioxide is widely used in catalysts, display devices, sensors, motor batteries and other fields. application. [0003] In the industry, molybdenum trioxide is generally produced by calcining ammonium molybdate. With the continuous development of material science and application technology, the molybdenum trioxide produced by this method cannot meet special requirements due to its coarse particles and agglomerated state. Disclosed a kind of preparation method of high-purity molybdenum trioxide for petroleum hydrorefining catalyst in CN102198958 as Guo Guanghua etc., amm...

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Problems solved by technology

[0006] Although the molybdenum trioxide with higher purity can be obtained by adopting the above-mentioned methods, there are still several problems as follows: 1, the recovery rate of molybdenum is obviously lower than 75%, which offsets the advantages brought by the improvement of product purity; A large amount of air flow is introduced inside, and most of the heat is not used to sublimate the product, but is used to increase the temperature of the introduced air; 3. The average particle size of the prepared product molybdenum trioxide is in the micron level, which cannot meet the specific requirements of materials science and other fields. Require

[0009] Although the above method can produce nano-scale products, the problem is that the sublimation time is long, generally more than 120min, and continuous production cannot be carried out.

Because of the plasma method, it is expected that the production time can be greatly shortened, but this method: 1. In order to ensure the rapid volatilization of molybdenum trioxide under plasma conditions, the plasma flame must maintain a high temperature (above 2000 ° C), resulting in the raw material molybdenum calcined sand Most of the impurities also volatilize into the gas phase, and finally condense and enter the product with molybdenum trioxide, which affects the purity of the product; 2. This method is just an idea, without industrial application, or even experimental equipment (Zhang Qixiu, editor-in-chief Zhao Qinsheng, "Tungsten Molybdenum Metallurgy", September 2005)

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