A method for preparing high-nitrogen vanadium nitride with coke

A technology for nitriding vanadium and coke, applied in the field of vanadium alloy, can solve the problem that high nitrogen vanadium nitride technology is rare, and achieve the effect of stable and uniform circulation

Active Publication Date: 2018-09-04
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods mainly produce low-nitrogen vanadium nitride, and there are few technologies that can be used for the production of high-nitrogen vanadium nitride.

Method used

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  • A method for preparing high-nitrogen vanadium nitride with coke
  • A method for preparing high-nitrogen vanadium nitride with coke

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Experimental program
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Effect test

Embodiment 1

[0060] This embodiment provides a kind of production method that substitutes 5wt% graphite with coke to prepare vanadium nitride, the ash content in the coke is 12~13.5wt%, the content of silicon dioxide in the ash is ≥55wt%, and the content of iron in the ash is 1wt%;

[0061] The method comprises the steps of:

[0062] Put 1000kg of vanadium trioxide, 247kg of graphite, 13kg of coke and 99.2kg of water into the mixer and press the balls. Control the flow of nitrogen gas flow to 200m 3 / h, the temperature of the carbon reduction section is 800°C, the central temperature of the nitriding section is 1450°C, the upper temperature of the cooling section is 900°C, the lower temperature of the cooling section is ≤150°C, and the residence time of raw materials in the nitriding section is After 20 hours, the vanadium nitride product was obtained.

Embodiment 2

[0066] This embodiment provides a kind of production method that substitutes 10wt% graphite with coke to prepare vanadium nitride, the ash content in the coke is 12~13.5wt%, the content of silicon dioxide in the ash is ≥ 55wt%, and the content of iron in the ash is 1wt%;

[0067] The method comprises the steps of:

[0068] Put 1000kg of vanadium trioxide, 234kg of graphite, 26kg of coke and 99.2kg of water into the mixer and press the balls. Control the flow of nitrogen gas flow to 200m 3 / h, the temperature of the carbon reduction section is 800°C, the central temperature of the nitriding section is 1450°C, the temperature of the upper part of the cooling section is 800°C, the temperature of the lower part of the cooling section is ≤150°C, and the residence time of raw materials in the nitriding section is 16h, the vanadium nitride product was obtained.

Embodiment 3

[0072] This embodiment provides a kind of production method that substitutes 15wt% graphite with coke to prepare vanadium nitride, the ash content in the coke is 12~13.5wt%, the content of silicon dioxide in the ash is ≥ 55wt%, and the content of iron in the ash is 1wt%;

[0073] The method comprises the steps of:

[0074] Put 1000kg of vanadium trioxide, 221kg of graphite, 39kg of coke and 99.2kg of water into the mixer and press the balls. After drying and screening, the raw pellets are put into the pusher kiln for firing. During the firing process Control the flow rate of nitrogen gas flow to 350m 3 / h, the temperature of the carbon reduction section is 1100°C, the central temperature of the nitriding section is 1500°C, the temperature of the upper part of the cooling section is 900°C, the temperature of the lower part of the cooling section is ≤150°C, and the residence time of raw materials in the nitriding section is After 20 hours, the vanadium nitride product was obta...

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Abstract

The invention provides a method for preparing high-nitrogen vanadium nitride from coke. The method comprises the following steps: mixing raw materials vanadium trioxide, graphite, coke and water to obtain a mixture, pelleting the mixture, and drying to obtain pellets, wherein the mass ratio of graphite to coke is 1 to (0.05 to 0.2); and burning the dried pellets in a nitrogen atmosphere, and generating a vanadium nitride finished product by virtue of reduction and nitrification under conditions that the center temperature of a nitrification section is 1450 to 1500 DEG C and the flow rate of nitrogen is kept at 100 to 350 m<3> / h. The coke is used for substituting partial graphite to prepare the high-nitrogen vanadium nitride, elementary silicon dioxide and elementary iron contained in ash in the coke are used for participating in the reaction, and the high-nitrogen vanadium nitride with a nitrogen content greater than or equal to 16 percent by weight is prepared by virtue of the synergist of the silicon dioxide, elementary iron and carbon; and meanwhile, the amount of the graphite is reduced, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of vanadium alloys, and relates to a method for preparing high-nitrogen vanadium nitride with coke, in particular to a method for preparing high-nitrogen vanadium nitride with coke partially replacing graphite. Background technique [0002] The addition of vanadium to low alloy steel mainly plays a role of precipitation strengthening. Adding nitrogen in steel can increase the durable strength of steel, improve the toughness and plasticity of steel, and at the same time improve the thermal strength and short-term creep resistance of steel. For every 10ppm of nitrogen in vanadium steel, the strength of the steel can be increased by 6MPa, because the increase of nitrogen content promotes the transfer of vanadium from solid solution state to V(CN) precipitated phase. A large amount of V(CN) was formed and precipitated while the size of the precipitates decreased. The amount of solid solution V precipitation is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/06
CPCC01B21/0617C01P2002/72
Inventor 吴春亮李兰杰李九江王海旭
Owner HEBEI IRON AND STEEL
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