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Method for producing vanadium-nitrogen alloy

A production method, vanadium-nitrogen alloy technology, applied in the field of high-efficiency production of vanadium-nitrogen alloys, can solve the problems of formula deviation from stoichiometry, mass production, and continuous production, etc., so as to avoid electric leakage and heating element short circuit, stable product quality, The effect of continuous uninterrupted production

Inactive Publication Date: 2008-07-23
刘先松 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although all these works provide theoretical and experimental references for the industrial preparation and synthesis of vanadium nitride, the disadvantages are: high production cost, small output, and cannot be mass-produced
The disadvantage of the method is: the water-containing molding material is pushed into the preparation furnace at one time, and the Na contained in the raw material at high temperature + and K + The aqueous solution of ions seriously corrodes the refractory material, and the kiln life is short
The disadvantages of the method are: the powdery material is pretreated in the rotary kiln, and the dust is large; the negative pressure is easy to cause the formula to deviate from the stoichiometric
The disadvantage of the method is: vacuuming, intermittent, not continuous production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 677kg of vanadium pentoxide (containing 55.2% vanadium) and 199kg of activated carbon, 60kg of 1% PVP-containing aqueous solution and 5kg of camphor 3% acetone solution, stir evenly, briquette, shape, and continuously add under nitrogen atmosphere The external heating type rotary kiln is pre-fired to 800°C under the protection of nitrogen, and the pre-fired block products cooled to room temperature under the protection of nitrogen are collected at the discharge port. Then it is pushed into an improved soft magnetic nitrogen atmosphere furnace and heated to a temperature of 1230°C. In the dynamic continuous process, the material undergoes carbonization and nitridation reactions. The total residence time in the high temperature zone is 7 hours and the vanadium-nitrogen alloy product is obtained after the furnace is released. The vanadium-nitrogen alloy prepared by the present invention: V: 78.7%, N: 16.5%, C: 4.3%, silicon, phosphorus and aluminum are less than: 0.10%, and it...

Embodiment 2

[0029] 879kg of ammonium metavanadate with 42.9% vanadium content and 253kg of activated carbon, together with 43kg of PVP3% aqueous solution and 5kg of camphor 3% acetone solution, stir evenly, briquette and shape, and continuously add external heat under nitrogen atmosphere Type rotary kiln, pre-fired to 860°C under the protection of nitrogen, and collect the pre-fired block products cooled to room temperature under the protection of nitrogen at the discharge port. Then it is pushed into an improved soft magnetic nitrogen atmosphere furnace and heated to a temperature of 1390°C. In the dynamic continuous process, the material undergoes carbonization and nitridation reactions. The total residence time in the high temperature zone is 5.5 hours and the vanadium-nitrogen alloy product is obtained after being released from the furnace. The vanadium-nitrogen alloy prepared by the present invention: V: 79.3%, N: 17.9%, C: 2.3%, silicon, phosphorus and aluminum are less than: 0.10%, and...

Embodiment 3

[0031] 357kg of vanadium pentoxide with 55.7% vanadium content and 439kg of 43.2% ammonium metavanadate with vanadium content and 239kg activated carbon, with 55kg of aqueous solution containing 2% PVP and 5kg of acetone solution containing 5% camphor. Briquetting, forming, continuously adding external heating rotary kiln under nitrogen atmosphere, pre-burning to 920°C under nitrogen protection, and collecting the pre-burned block products cooled to room temperature under nitrogen protection at the discharge port. Then it was pushed into the modified soft magnetic nitrogen atmosphere furnace and heated to 1460°C. In the dynamic continuous process, the material undergoes carbonization and nitridation reactions. The total residence time in the high-temperature zone is 3.5 hours and the vanadium-nitrogen alloy product is obtained after the furnace is released. The vanadium-nitrogen alloy prepared by the present invention: V: 80.5%, N: 18.7%, C: 0.3%, silicon, phosphorus and aluminum ...

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Abstract

The invention relates to a production method for vanadium-nitrogen alloy, which comprises following steps: evenly mixing oxide of powder vanadium or ammonium metavanadate, carbon powder and binder, continuously adding into an external-heating rotary kiln in nitrogen atmosphere after briquetting and forming, and presintering to below 1000 DEG C under the protection of nitrogen; collecting the presintered block product which is cooled to ambient temperature under the protection of nitrogen at a discharge opening, pushing into an improved soft magnetic nitrogen atmosphere furnace kiln, heating to 1000 to 1500 DEG C for carbonization and nitridation reaction, and vanadium-nitrogen alloy product is obtained after discharge. The composition of the vanadium-nitrogen alloy: V is 78 to 83%, N is 16 to 21%, C is 6% max, and silicon, phosphorus and aluminum are less than 0.10%; the apparent density is greater than 3.5g / cm<3>. The production method for vanadium-nitrogen alloy has the advantages of adopting rotary kiln for precalcination, removing harmful impurities and corrosive elements, reducing stacking volume, greatly improving productivity of carbonization and nitridation working procedures, and greatly prolonging service life of nitriding furnace kiln.

Description

Technical field [0001] The invention is a method for efficiently producing vanadium-nitrogen alloy, which belongs to the field of new materials. Background technique [0002] In 1925 Friederich and Sittig (E. Friederich and L. Sittig, Z. Anorg. Allg. Chem. 1925, 144, 169) named V 2 O 3 As a raw material, using charcoal fired from pine trees, vanadium nitride was prepared at 1200°C. [0003] In 1975, Guidotti et al. (R.A. Guidotti, G.B. Atkinson and D.G. Kesterke, Report of Investigation No. 8079, US Bureau of Mines, Washington DC, 1975) reduced vanadium pentoxide with ammonia to also obtain vanadium nitride. [0004] In 1995, Rajat and S.T. Oyama (Journal of Solid State Chemistry, 1995, 120, 320-326) used methane to reduce vanadium pentoxide at 1180°C to synthesize vanadium carbide. [0005] In December 2000, the Journal of Materials Chemistry of the Royal Society of Chemistry, 2001, 11, 691-695 published an academic paper by Prabhat Kumar Tripathy, which uses vanadium pentoxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/16C22C1/05
Inventor 刘先松刘知之
Owner 刘先松
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