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Technology for preparing nitrided ferrovanadium alloy

A vanadium nitride ferrous alloy and preparation process technology, applied in the field of metallurgy, can solve the problems of complex production process of solid-state nitriding method, unfavorable for the absorption of alloy elements, affecting the quality of ferrovanadium nitride, etc., and achieves rapid gas-solid reaction and variety of raw materials The effect of reducing and reducing the variety of raw materials

Pending Publication Date: 2019-07-16
CHONGQING UNIV
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Problems solved by technology

[0004] However, the current methods for producing ferrovanadium nitride have certain defects
(1) The production process of the solid-state nitriding method is relatively complicated, and the temperature requirement is not high, but it needs to be carried out under vacuum or semi-vacuum, the equipment requirements are high, and the production cost is relatively high
At the same time, the nitrogen content of vanadium iron nitride produced by this method is relatively low, and the density is generally 4.0~4.5 g / cm 3 , it is not easy to add into molten steel, and it is not conducive to the absorption of alloying elements by molten steel
(2) The problem of high viscosity of the nitrogen-containing melt in the liquid nitriding method has not been well resolved, which affects the quality of the obtained ferrovanadium nitride
(3) The production of ferrovanadium nitride by the self-propagating high-temperature synthesis method needs to be carried out in a high-temperature container. Although the energy consumption is low, the production efficiency is relatively low
The reducing agent of this method is carbonaceous powder, which will produce greenhouse gases. At the same time, the ferrovanadium nitride produced contains a certain amount of carbon, and the raw material is iron powder, which is obtained by reducing iron oxide. Therefore, this method is more complicated

Method used

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  • Technology for preparing nitrided ferrovanadium alloy
  • Technology for preparing nitrided ferrovanadium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Take the production of FeV45N10 FeV45N10 iron vanadium nitride alloy as an example.

[0024] Put iron oxide powder and vanadium trioxide powder with a particle size of 1 μm to 100 μm in a drying oven, and dry at 75°C to 80°C for 10min to 15min, specifically, 75°C for 15min, 76°C for 12min, and 77°C for 14min Or dry at 80°C for 10 minutes. Then mix iron oxide and vanadium trioxide evenly so that the mass ratio of vanadium element to iron element is 1. Put the mixture into a tubular heating furnace, raise the temperature and pass in argon gas with a flow rate of 150mL / min for protection. When the temperature is at 1200°C, pass ammonia gas with a flow rate of 150mL / min into the tubular heating furnace, and keep it warm for 4h at the same time. Subsequently, argon gas was introduced at a flow rate of 150 mL / min, sintered in an argon atmosphere for 2 h, and finally cooled to room temperature in an argon atmosphere, and the ferrovanadium nitride alloy obtained ...

Embodiment 2

[0026] Embodiment 2: Take the production of FeV55N11 iron vanadium nitride alloy as an example.

[0027] Put iron oxide powder and vanadium dioxide powder with a particle size of 100 μm to 200 μm in a drying oven, and dry at 75 to 80°C for 10min to 15min, specifically, 75°C for 15min, 76°C for 12min, 77°C for 14min or 80°C. ℃ drying 10min. Then mix iron oxide and vanadium dioxide evenly so that the mass ratio of vanadium element to iron element is 1.5. Put the mixture into a controlled atmosphere furnace, raise the temperature and pass in argon gas with a flow rate of 150mL / min for protection. When the temperature is at 1100°C, pass ammonia gas with a flow rate of 150mL / min into the controlled atmosphere furnace, and keep it warm for 6 hours at the same time. Then argon gas was introduced at a flow rate of 150 mL / min, sintered in an argon atmosphere for 4 hours, and finally cooled to room temperature in an argon atmosphere, and the ferrovanadium nitride alloy obtained was tak...

Embodiment 3

[0029] Embodiment 3: Take the production of FeV65N13 FeV65N13 iron vanadium nitride alloy as an example.

[0030] Put iron oxide powder and vanadium pentoxide powder with a particle size of 1 μm to 100 μm in a drying oven, and dry at 75 to 80°C for 10min to 15min, specifically, 75°C for 15min, 76°C for 12min, 77°C for 14min or Dry at 80°C for 10 minutes. Then iron oxide and vanadium pentoxide are mixed evenly so that the mass ratio of vanadium and iron is 2.5, the mixture is put into a controlled atmosphere furnace, the temperature is raised and the flow rate is 100mL / min for protection by argon. Introduce ammonia gas at 650°C for pre-reduction for 3 hours, then raise the temperature to 1000°C in an atmosphere of argon, pass ammonia gas at a flow rate of 100mL / min into the tube furnace, keep it warm for 8h, and then pass in a flow rate of 100mL / min Argon, sintering in an atmosphere of argon for 6h, and finally cooling down to room temperature in an atmosphere of argon, and ta...

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Abstract

The invention relates to a technology for preparing nitrided ferrovanadium alloy. The technology includes the following steps that at a reduction-nitridation stage, raw materials are put into a high-temperature reactor after being evenly mixed in proportion, and argon is connected in at first; the temperature is raised in the protective atmosphere of the argon; when the temperature rises to the reaction temperature of a reduction-nitridation reaction, ammonia gas is connected in for carrying out the reduction-nitridation reaction; connecting in of the ammonia gas is stopped after the reactionis completed, argon is connected in, and a product of the reduction-nitridation reaction is sintered in the argon atmosphere; and finally the product is cooled to be at an indoor temperature in the argon atmosphere and the block-shaped nitrided ferrovanadium alloy is obtained. According to the technology, reaction and nitridation reactions are carried out synchronously, and the preparation technology is simplified; and the impurity element carbon cannot be introduced in the prepared nitrided ferrovanadium alloy, the product purity is improved, and the phenomenon that greenhouse gases are emitted to cause environmental problems can be avoided.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and mainly relates to a preparation process of ferrovanadium nitride alloy. Background technique [0002] Ferrovanadium nitride is an alloy additive in the steelmaking process. It can refine grains, improve the performance of steel, and make it have higher strength, toughness, ductility and thermal fatigue resistance. Ferrovanadium nitride improves the properties of steel better than vanadium nitride. The reason is that the specific gravity of ferrovanadium nitride is above 5.0g / cm³, while the specific gravity of vanadium nitride is about 3.5 g / cm³. In molten steel, ferrovanadium nitride can enter molten steel faster, which improves the absorption rate of vanadium nitrogen in molten steel. [0003] At present, there are three main methods for preparing ferrovanadium nitride: (1) solid-state nitriding method. The solid-state nitriding method mainly uses ferrovanadium as the raw material to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C35/00C22C29/16C22C1/05
CPCC22C1/056C22C29/16C22C35/00
Inventor 游志雄刘勇杰吕学伟张宇党杰向俊一邱贵宝张生富扈玫珑李涛徐健余文轴胡丽文辛云涛
Owner CHONGQING UNIV
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