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Method for preparing vanadium nitride

A technology of vanadium nitride and vanadium pentoxide, which is applied in the field of iron and steel metallurgy, can solve the problems of high energy consumption and high cost of raw materials, and achieve the effects of low reaction temperature, reduced equipment investment and maintenance costs, and high degree of automation

Inactive Publication Date: 2006-05-24
浙江铭鑫新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

High energy consumption and high cost of raw materials

Method used

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  • Method for preparing vanadium nitride

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Experimental program
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Effect test

Embodiment 1

[0043] Grind 3.0kg flake vanadium pentoxide (purity 98.6%, the same below) through a 65-mesh sieve, put it into the feed hopper of the rotary kiln, and feed the powder into the sealed rotary kiln body system by the screw feeder . The inner diameter of the rotary kiln tube is 99mm, the length is 146cm, and the length of the heating section is 90cm. The average residence time of the material in the entire furnace tube is 2h. The feed is about 450g per hour, the flow rate of ammonia gas is 0.5m3 / h, and the feed is countercurrent to the solid material. The output per hour is about 300g, and the product is dark reddish brown, and some crystal planes are golden yellow. Continuous production for 7 hours, a total of about 2.0kg of product (some residues in the kiln). Product composition V77.5%, N18.6%, O2.6%, C<0.01%.

Embodiment 2

[0045] Crush flake vanadium pentoxide, pass through a sieve with an aperture of 4 mm, take 2.1 kg of the remainder of the sieve with an aperture of 1 mm, and put it into a vertical tube furnace at 400 ° C under an ammonia atmosphere saturated with trimethylamine. Reduction for 1 hour, and then heating up to 650° C. for 30 hours to obtain kg of vanadium nitride product, the composition of which is V78.1%, N16.6%, O1.2%, C2.8%.

Embodiment 3

[0047] The sheet-like vanadium pentoxide is crushed, passed through a sieve with an aperture of 4mm, and the remaining part kg of the sieve with an aperture of 1mm is taken, put into several square stainless steel shallow pans, and mixed with ammonia and natural gas (carbon element moles in ammonia and natural gas) Ratio 10:1) through the pusher kiln with the highest temperature zone temperature of 800°C, the vanadium material passes through the preheating section, the highest temperature section, and the cooling section in the pusher kiln, and then cools to 150°C for discharge. The residence time in the high-temperature zone is 1 h, and the vanadium nitride product kg is obtained, and the product composition is V77.8%, N18.2%, O2.3%, and C0.8%.

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Abstract

The invention provides a method for preparing vanadium nitride, raising the temperature of ammonium melavanadate, ammonium polyvanadate, V2O5 whose crystallization water content is smaller than 8wt% or greater than 10wt%, VO2, V2O3, VO, or other low-valence vanadium oxides and V-Fe alloys, or their mixture in the reducing atmosphere containing nitrogen element or nitrogen and carbon elements up to 400-800 deg.C to react for 0.5-48 hours, so as to obtain the vanadium nitride whose oxygen content is less than 3%. The vanadium nitride powder is pressed by equistatic pressure blocking into balls or blocks with apparent density greater than 3.0g / ml so as to be used in the additives for V-containing alloy steels or other V-containing alloys. The advantages of the invention are that its reaction temperature is low, it can save energy sources, it can continuously produce and it is suitable for large scale industrialized production.

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 浙江铭鑫新材料科技有限公司
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