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A kind of preparation method of molybdenum dioxide

A technology of molybdenum dioxide and molybdenum trioxide, which is applied in the field of powder metallurgy, can solve the problems of high danger and potential safety hazards, and achieve the effects of reducing production costs, high safety, and saving man-hours

Active Publication Date: 2021-02-02
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned method for preparing molybdenum dioxide first needs to replace the air in the reaction furnace with hydrogen, and the molybdenum trioxide reacts in hydrogen throughout the whole process. Since hydrogen is a flammable and explosive gas, it is very dangerous and there are potential safety hazards in the process of use.

Method used

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  • A kind of preparation method of molybdenum dioxide
  • A kind of preparation method of molybdenum dioxide
  • A kind of preparation method of molybdenum dioxide

Examples

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Embodiment 1

[0030] The method of the present embodiment comprises the following steps:

[0031] Step 1. Fully mix 3.01g of molybdenum trioxide and 1g of molybdenum powder and grind them evenly to obtain a mixed powder; the particle size of the molybdenum powder is 0.4 μm;

[0032] Step 2. Put the mixed powder obtained in step 1 into the high temperature resistant boat of the reaction tube, then evacuate to a vacuum degree of 0.8 MPa in the reaction tube, and then pass in argon gas to replace the gas in the reaction tube and fill the reaction tube The diameter of the reaction tube is 50 mm, and the length is 1000 mm; the thickness of the mixed powder loaded into the high temperature boat is 5 mm, and the replacement time of the gas in the argon replacement reaction tube is 10 min;

[0033] Step 3. Heat the mixed powder in the high-temperature resistant boat mentioned in step 2 to 600°C for 2 hours and continue to feed argon gas. After the heating reaction is completed, brown molybdenum dio...

Embodiment 2

[0040] The method of the present embodiment comprises the following steps:

[0041] Step 1, fully mixing 3.05g of molybdenum trioxide and 1g of molybdenum powder and grinding them evenly to obtain a mixed powder; the particle size of the molybdenum powder is 0.7 μm;

[0042] Step 2. Put the mixed powder obtained in step 1 into the high-temperature-resistant boat of the reaction tube, then evacuate until the vacuum degree in the reaction tube is 0.85MPa, and then pass in argon gas to replace the gas in the reaction tube and fill the reaction tube. The diameter of the reaction tube is 56mm, and the length is 1100mm; the thickness of the mixed powder loaded into the high temperature boat is 7mm, and the replacement time of the gas in the argon replacement reaction tube is 15min;

[0043] Step 3. Heat the mixed powder in the high temperature resistant boat described in step 2 to 630°C for 3 hours and continue to feed argon gas. After the heating reaction is completed, brown molybd...

Embodiment 3

[0050] The method of the present embodiment comprises the following steps:

[0051] Step 1, fully mixing 3.1g of molybdenum trioxide and 1g of molybdenum powder and grinding them evenly to obtain a mixed powder; the particle size of the molybdenum powder is 1 μm;

[0052] Step 2. Put the mixed powder obtained in step 1 into the high-temperature-resistant boat of the reaction tube, then evacuate until the vacuum degree in the reaction tube is 0.9MPa, and then pass in argon gas to replace the gas in the reaction tube and fill the reaction tube. The diameter of the reaction tube is 60mm, and the length is 1200mm; the thickness of the mixed powder loaded into the high temperature boat is 10mm, and the replacement time of the gas in the argon replacement reaction tube is 20min;

[0053] Step 3. Heat the mixed powder in the high-temperature resistant boat mentioned in step 2 to 650°C for 4 hours and continue to feed argon gas. After the heating reaction is completed, tan molybdenum ...

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Abstract

The invention discloses a preparation method of molybdenum dioxide. The preparation method comprises the first step of mixing molybdenum trioxide and molybdenum powder thoroughly and grinding uniformly to obtain mixed powder; the second step of charging the mixed powder into a high temperature resistant boat of a reaction device, then vacuuming, then introducing inert gas to replace the gas in thereaction device and fill the reaction device; the third step of heating the mixed powder in the high temperature resistant boat for reaction, continuously introducing the inert gas and cooling afterthe heating reaction to obtain the molybdenum dioxide. According to the preparation method, the molybdenum trioxide and the molybdenum powder are thoroughly mixed and ground and then placed in the inert gas for reduction reaction to convert the molybdenum trioxide into the molybdenum dioxide, reduction with hydrogen is avoided, the safety of preparation of the molybdenum dioxide is improved, the preparation cost is reduced, the method is simple, the product purity is high, and the method is beneficial to popularization and application.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a method for preparing molybdenum dioxide. Background technique [0002] Molybdenum dioxide (MoO 2 ) is an indispensable intermediate oxide for the production of metal molybdenum. Molybdenum dioxide is insoluble in water, ammonia, alkali, and non-oxidizing acid aqueous solution. The content of molybdenum is relatively high, and it is not easy to sublimate. MoO 3 ). Molybdenum dioxide is usually prepared by reducing molybdenum trioxide with hydrogen at 450°C-500°C. The specific process is: first put molybdenum trioxide into a high-temperature resistant boat, slowly propel it in a hydrogen flow, and heat it to 450°C-500°C to keep From 6h to 7h, the following reactions occurred. [0003] MoO 3 +H 2 =MoO 2 +H 2 o [0004] The above-mentioned method for preparing molybdenum dioxide first needs to replace the air in the reaction furnace with hydrogen, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/02
CPCC01G39/02C01P2002/80C01P2004/03C01P2006/80
Inventor 唐军利
Owner JINDUICHENG MOLYBDENUM CO LTD
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