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Method for preparing vanadium nitride and device

A production method and technology for nitriding vanadium, applied in the field of vanadium alloy, can solve the problems of low output, large consumption of reduction and nitriding gas, low production efficiency and the like

Active Publication Date: 2005-01-12
湖南恒星进出口有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: low reduction efficiency, large consumption of reduction and nitriding gases; the product is powdery and cannot be directly added to the steelmaking furnace
The disadvantages of this method are: long production cycle, low output and high energy consumption
Mix vanadium oxynitride with ground carbon-containing materials, and treat at high temperature in an inert or nitrogen-containing atmosphere or in a vacuum furnace to obtain vanadium nitride containing C2-6%. The disadvantage of this method is that the resulting intermediate Vanadium oxynitride is taken out and mixed with carbon-containing materials, and then reduced and nitrided to obtain vanadium nitride. The process is long, the production efficiency is low, and the corresponding energy consumption is high.
Using vacuum electric heating furnace, high energy consumption
At the same time, in terms of vanadium nitride production equipment, there is no precedent for using industrial microwave ovens

Method used

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  • Method for preparing vanadium nitride and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] 900kg of 90% V with a purity of 98.56% has been ground into 120 mesh 2 o 5 Powder, 332kg of graphite powder and 125kg of 1% carboxymethylcellulose aqueous solution are mixed and pressed into pieces of φ80×30mm. Then put the block into the crucible 5, and automatically push it into the microwave oven by the control system. After the furnace door is closed and sealed, the vacuum system starts to start and pump air. When the vacuum reaches 40 Pa, start heating, pre-reduce at 650°C for 1 hour, and then carbonize at 1400°C for 2 hours. After the carbonization is finished, stop pumping, let in nitrogen, and nitriding at 1000°C for 2 hours. After the heating is over, the product is automatically released when it is naturally cooled to 180°C in the furnace, and the apparent density of 617kg is 3810g / cm 3 , containing V78.32%, N12.22%, C6.41%, O1.55% vanadium nitride.

Embodiment 2

[0009] 700kg of 90% V with a purity of 98.32% has been ground into 120 mesh 2 o 5 Powder, 250kg of graphite powder and 88kg of 1% carboxymethyl cellulose aqueous solution are mixed and pressed into pieces of φ80×30mm. Then put the block into the crucible 5, and automatically push it into the microwave oven by the control system. After the furnace door is closed and sealed, the vacuum system starts to start and pump air. When the vacuum reaches 100 Pa, start heating, pre-reduce at 600°C for 0.5 hours, and then carbonize at 1300°C for 1.5 hours. After the carbonization is completed, stop pumping, feed nitrogen, and nitriding at 1100°C for 2.5 hours. After heating, the product is automatically released when it is naturally cooled to 170°C in the furnace, and the apparent density of 486kg is 3570g / cm 3 , containing V77.89%, N9.05%, C8.15%, O3.25% vanadium nitride.

Embodiment 3

[0011] 1000kg of 80% V with a purity of 98.17% has been ground into 200 mesh 2 o 5 Powder, 333kg of graphite powder and 130kg of 1% carboxymethyl cellulose aqueous solution are mixed and pressed into pieces of φ80×30mm. Then put the block into the crucible 5, and automatically push it into the microwave oven by the control system. After the furnace door is closed and sealed, the vacuum system starts to start and pump air. When the vacuum reaches 30 Pa, start heating, pre-reduce at 680°C for 1 hour, and then carbonize at 1450°C for 2 hours. After the carbonization is completed, stop pumping, feed nitrogen, and nitriding at 1200°C for 3.5 hours. After the heating is over, the product is automatically released when it is naturally cooled to 150°C in the furnace, and the apparent density of 682kg is 4170g / cm 3 , containing V79.28%, N13.34%, C5.07%, O0.81% vanadium nitride.

[0012] The vanadium nitride product obtained by applying the production method and equipment of the pr...

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Abstract

The invention specially relates to an industrial batch-type vanadium nitride producing method and devices. Grinded vanadium oxide powder and carbonaceous are used as raw materials, which binder is added in, to produce vanadium nitride by heating in microwave oven. The characteristic is mixing vanadium oxide, active carbon and binder according properly ratio, then briqueting and forming, putting the formed material into special microwave heating oven, unceasingly exhausting to keep vacuum, prereducing, carbononizing, nitrating and natural cooling, finally the product is taken out the oven. This product is used as additive agent of various kinds of alloy steel containing vanadium mainly.

Description

technical field [0001] The invention belongs to the technical field of vanadium alloys, in particular to a method and equipment for industrially producing vanadium nitride in batches. Background technique [0002] Existing vanadium nitride preparation methods at home and abroad have: (1) U.S. Patent US3745209 proposes, take vanadium pentoxide or ammonium metavanadate as raw material, the mixed gas of hydrogen, nitrogen and natural gas, or ammonia, nitrogen and natural gas, ammonia The mixed gas with carbon monoxide is reducing gas and nitriding gas, and vanadium nitride containing V74.2-78.7%, N4.2-16.2%, and C6.7-18.0% is continuously produced in a fluidized bed or a rotary tube. The reduction temperature is 800-1200°C, preferably 900-1100°C. The disadvantages of this method are: low reduction efficiency, large consumption of reducing and nitriding gases; the product is powdery and cannot be directly added to the steelmaking furnace. (2) P. K. Tripathy et al. proposed in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06C01G31/00
Inventor 丁喻谭少波
Owner 湖南恒星进出口有限责任公司
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