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Production method of vanadium nitride

A production method and technology of vanadium nitride, applied in the direction of nitrogen-metal/silicon/boron binary compounds, etc., can solve the problems of aggravating the adhesion degree of the final product, long time in the softening stage, serious product adhesion, etc. And the effect of high gas utilization efficiency, low production cost and high product quality

Active Publication Date: 2011-01-19
江阴市中赢有色金属新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since there is a material softening stage in the production process of vanadium nitride, the material reacts while softening, which makes the block materials stick together. The conventional horizontal kiln is transported by a bowl, and each The volume of materials in the bowl is small, and it is easy to take out after being bonded; when using a shaft furnace reaction, a large amount of materials are mixed together, and the product is seriously bonded after softening, which is difficult to take out from the shaft furnace, and finally the production is forced to stop
[0006] And the conventional preparation method does not use any catalyst, its production cycle is long, work efficiency is low, energy consumption is high, and the time that the material is in the softening stage is long, also increases the degree of final product cohesion
[0007] In addition, in the conventional preparation method, in order to ensure the apparent density of the final product, a binder is used in the preparation process, which increases the degree of adhesion of the final product.
[0008] Due to the existence of the above defects, although the shaft furnace has been advocated by the industry as an effective method to increase the nitrogen content in vanadium nitride, the defects in its practical application have always plagued the production enterprises and become a bottleneck restricting its development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Mix 560kg of vanadium oxide containing 56% vanadium with 168kg of carbon powder and 0.8kg of FeO, press it into raw material balls, wrap its surface with 600-mesh vanadium nitride superfine powder, and put the raw materials into the shaft furnace. It takes 45 minutes to pass through the ℃ region, and then it is cooled to 150 ℃ and released from the furnace to obtain 398kg of vanadium nitride containing 78.6%V, 17.46%N, 2.33%C, 0.015%S, and 0.007%P, with an apparent density of 3560kg / m 3 .

Embodiment 2

[0039] 735kg containing vanadium 64.1% vanadium oxide and 198kg carbon powder and 0.9kg Fe 2 o 3 Mixing, pressing and forming, and then wrapping its surface with 700 mesh vanadium nitride superfine powder, adding the raw materials into the shaft furnace, the materials passed through the area of ​​1490 ° C for 55 minutes, and then cooled to 100 ° C to get out of the furnace to obtain 78.3% V, 16.95 %N, 3.45%C, 0.017%S, 0.008%P 601kg vanadium nitride, apparent density 3680kg / m 3 .

Embodiment 3

[0041] With 850kg vanadium-containing 56% vanadium oxide and 255kg carbon powder and 1.1kg Fe 3 o 4Mixing, pressing and molding, and then wrapping its surface with 800 mesh vanadium nitride superfine powder, adding the raw materials into the shaft furnace, the materials passed through the area of ​​1520 ° C for 40 minutes, and then cooled to 90 ° C to get out of the furnace to obtain 78.8% V, 17.85 %N, 1.98%C, 0.009%S, 0.017%P 604kg vanadium nitride, apparent density 3390kg / m 3 .

[0042] The vanadium nitride superfine powder in the above examples is the vanadium nitride finished product of VN12 or VN16 specified by the national standard, and is ground by ball mill, Raymond mill, jet mill and other equipment.

[0043] The ball making process adopts a hydraulic ball making machine, and the ball making pressure is greater than 250 tons. The density of pressed raw material balls is greater than 3000kg / m 3 .

[0044] The above raw materials must be ground into 200 mesh or les...

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Abstract

The invention relates to a production method of vanadium nitride. The production method includes that: powdery vanadium oxide, carbon powder and catalyst are mixed and pressed into raw material spheres, the surface of raw material sphere is wrapped with vanadium nitride superfine powder and is added into a vertical furnace continuously, meanwhile nitrogen is introduced into the vertical furnace to be taken as reaction gas, material is heated to 1200-1600 DEG C, reduction and nitridation reactions are taken place on the material in the temperature range, time duration is less than 40-60min, and the material is cooled to certain temperature under protective atmosphere and then is taken out the furnace, thus obtaining the vanadium nitride product. The invention can solve the problem of bonding while discharging which is caused by the vertical furnace; and the invention has the advantages that production cycle is short, utilization ratio of energy and gas is high, production efficiency is high, production mode is flexible, product quality is high, and production cost is low.

Description

(1) Technical field [0001] The invention relates to a production method of vanadium nitride, belonging to the technical field of vanadium alloy production. (2) Background technology [0002] Vanadium nitride can replace ferrovanadium for the production of microalloyed steel. The addition of vanadium nitride to steel can improve the comprehensive mechanical properties of steel such as strength, toughness, ductility and thermal fatigue resistance, and make the steel have good weldability. When the same strength is achieved, the addition of vanadium nitride saves 30-40% of the added vanadium, thereby reducing the cost. [0003] A large number of industrial-scale application data show that increasing the nitrogen content in vanadium-containing steel can increase the yield strength of the steel. The main reason is that the increase in nitrogen content in the steel reduces the tendency of precipitation phase growth and coarsening. Finally, the precipitated phase particles become...

Claims

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Application Information

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IPC IPC(8): C22C29/16C22C1/00C01B21/06
Inventor 李正邦刘玮梁林宝刘林清
Owner 江阴市中赢有色金属新材料有限公司
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