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Method for preparing vanadium nitride

A technology of vanadium nitride and nitriding atmosphere, applied in the field of iron and steel metallurgy, can solve the problems of no implementation cases, incomplete reduction and nitridation reaction, no mention of current induction frequency, etc., and achieve the effect of reducing energy consumption or raw material cost

Inactive Publication Date: 2009-02-25
冯良荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CN1757606A and CN101082089 mention the application of induction furnaces, they do not mention the frequency of current induction, and there are no actual implementation cases in patent application documents and reality
These resistance heating equipment have slow heat transfer and high heat loss. The power consumption per ton of vanadium nitride in the process of resistance furnace pushing plate kiln is about 14000kWh
However, microwave heating is not also large-scale, and the reduction and nitriding reaction is not complete enough.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 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 vertical induction furnace. The frequency of the induced current is controlled at 150Hz, and the internal temperature of the shaft kiln goes from room temperature to a maximum temperature of 1500°C from top to bottom in the axial direction, and then drops 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 Nitrogen and synthesis gas (CO+H 2 ), the reaction tail gas is withdrawn from the shaft kiln top.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 obtained product contains 78.9% V, 15.0% N, 3.1% C. The lumpy product is formed by shrinking the raw material, and there is no further agglomeration between the lumps. The pow...

Embodiment 2

[0045] 3,000kg of orange powdery vanadium pentoxide with a content greater than 99%, 800kg of activated carbon, 200kg of paraffin wax, and 200kg of starch are ball-milled, briquetted, and then loaded into a vertical kiln. The frequency of the induced current is controlled at 2000Hz, and the middle part of the shaft kiln is lined with graphite where it contacts the solid reaction medium. The temperature inside the shaft kiln goes from room temperature to a maximum temperature of 1500°C from top to bottom in the axial direction, and then drops 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 78.2% V, 17.3% N, and 1.7% C. ...

Embodiment 3

[0047] 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 frequency of the induction current is controlled at 3000Hz, and the place inside the shaft kiln in contact with the solid reaction medium is lined with PbO 2 , 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 77.6% V, 18.2% N, and 1.1% C. The lumpy product is for...

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Abstract

The invention provides a method for preparing vanadium nitride. Vanadium compounds with a valence state more than four or a mixture of the compounds and organic carbon or inorganic carbon are compacted together with a binder for molding, and then the mold product is gradually heated till the temperature reaches 1,100-1,900 DEG C in a 100-4,000Hz induction heating furnace, and the product obtained is reduced and nitrified to obtain the vanadium nitride. The method has the advantages of high thermal efficiency and low power consumption.

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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IPC IPC(8): C01B21/06
Inventor 冯良荣
Owner 冯良荣
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