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Method for producing vanadium nitride

A technology of vanadium nitride and nitriding atmosphere, which is applied in the field of iron and steel metallurgy, can solve the problems of high raw material cost, high energy consumption, and small production volume, and achieve the effect of reducing energy consumption

Inactive Publication Date: 2008-05-07
冯良荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is prepared on a thermal analysis instrument, and its preparation amount is very small, only in grams or even milligrams
[0022] In summary, in the existing preparation methods, V 2 o 3 Or other specially prepared raw materials, otherwise it will be difficult to solve the melting problem of high-valent vanadium in the low temperature section during the reduction process
Or pre-reduction and high-temperature reduction and nitriding in different reaction furnaces, which consume a lot of energy and cost high raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 3000kg of flaky vanadium pentoxide with a content greater than 98%, 1000kg of graphite, and 200kg of polyethylene polyamine are ball milled, pressed into blocks, and then loaded into a shaft kiln. The internal temperature of the shaft kiln is from room temperature to the highest temperature of 1500°C from top to bottom in the axial direction, and then decreases to about 100°C. Lump raw materials are fed continuously or intermittently from the top of the shaft kiln and discharged from the bottom of the shaft kiln. Nitrogen and synthesis gas (CO+H 2 ), the reaction tail gas is withdrawn from the shaft kiln top. According to the production requirements, solid materials stay in the shaft kiln for 6 hours to 200 hours. The resulting product contains 78.7% V, 15.2% N, 3.3% C. The lumpy product is formed by shrinking the raw material, and there is no further agglomeration between the lumps.

Embodiment 2

[0046] 3,000kg of red powdery vanadium pentoxide with a content greater than 99%, 800kg of activated carbon, 200kg of paraffin, and 200kg of starch are ball-milled, briquetted, and then loaded into a vertical kiln. The internal temperature of the shaft kiln is from room temperature to the highest temperature of 1500°C from top to bottom in the axial direction, and then decreases to about 100°C. Lump raw materials are fed continuously or intermittently from the top of the shaft kiln and discharged from the bottom of the shaft kiln. Nitrogen gas is fed into the bottom of the shaft kiln, and the reaction tail gas is withdrawn from the shaft kiln top. According to the production requirements, solid materials stay in the shaft kiln for 6 hours to 200 hours. The resulting product contains 78.1% V, 17.1% N, and 1.6% C. The lumpy product is formed by shrinking the raw material, and there is no further agglomeration between the lumps.

Embodiment 3

[0048] 3000kg of flaky vanadium pentoxide with a content greater than 98%, 900kg of carbon black, and 200kg of starch are ball-milled, briquetted, and then loaded into a shaft kiln. The internal temperature of the shaft kiln is from room temperature to the highest temperature of 1300°C from top to bottom in the axial direction, and then decreases to about 100°C. Lump raw materials are fed continuously or intermittently from the top of the shaft kiln and discharged from the bottom of the shaft kiln. Nitrogen and ammonia are fed into the bottom of the shaft kiln, and the reaction tail gas is withdrawn from the shaft kiln top. According to the production requirements, solid materials stay in the shaft kiln for 6 hours to 200 hours. The resulting product contains 77.8% V, 18.0% N, and 1.3% C. The lumpy product is formed by shrinking the raw material, and there is no further agglomeration between the lumps.

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Abstract

The invention provides a preparation method of vanadium nitride. Vanadium compound with the valence state of above quadrivalence or the mixture of the compound and organic carbon or inorganic carbon are formed through briquetting with adhesive agent, vanadium is pre-reduced into a lower valence state with the hydrogen with reducing property at 700 DEG C, then the temperature is gradually increased to 1100 to 1900 DEG C, therefore, the vanadium nitride product is gotten through reduction and nitridation. The block-shaped product is formed by contracting the material and no further agglomeration and adhesive bonding phenomenon occurs among blocks. The invention has the advantage that the melting and agglomeration phenomenon of the high valence vanadium compound near by the melting point is avoided.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and relates to a preparation method of vanadium nitride. Background technique [0002] Vanadium nitride is an excellent steelmaking additive, which can significantly improve and improve the comprehensive mechanical properties and welding properties of steel. Compared with the use of ferrovanadium, 20% to 40% of vanadium resources can be saved, thereby reducing the production cost of steelmaking. Taking the construction industry as an example, the new tertiary steel bar produced by vanadium-nitrogen alloying technology not only enhances the safety, earthquake resistance, toughness, and welding performance of the building because of its increased strength, but also saves steel by 10% compared with ordinary steel bars. % to 12% and other advantages. [0003] In 1967, J.H.Downing and others disclosed in US3334992 that 181Kg of V 2 o 5 , 62Kg of carbon powder, 4.1Kg of resin and 3Kg of iron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06C01G31/00
Inventor 冯良荣
Owner 冯良荣
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