Preparation method of high-nitrogen vanadium nitride

A technology of vanadium nitride and vanadium oxide, which is applied in the field of preparation of high-nitrogen vanadium nitride, can solve problems such as the difficulty in precisely controlling the carbon content of products, difficulty in preparing high-nitrogen vanadium nitride, and reduced furnace life, and achieve product quality Effects of stabilization, strength improvement, and productivity improvement

Active Publication Date: 2016-08-10
HEBEI IRON AND STEEL
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AI Technical Summary

Problems solved by technology

[0017] In view of the waste of nitrogen existing in the preparation of vanadium nitride by the existing horizontal pusher kiln, the service life of the furnace body is shortened, and it is very difficult to accurately control the carbon content in the product. High nitrogen (nitrogen content greater than 16%) problems such as vanadium nitride, the invention provides a kind of preparation method of vanadium nitride

Method used

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preparation example Construction

[0055] The specific embodiment part of the present invention provides a kind of preparation method of vanadium nitride, and described preparation method comprises the following steps:

[0056] (1) Mix vanadium oxide, carbonaceous reducing agent and water to make pellets;

[0057] (2) Put the prepared pellets into a vertical intermediate frequency furnace with a flow rate of 80-200m 3 / h nitrogen, the pellets move from top to bottom in the vertical intermediate frequency furnace, react in the heating section of the vertical intermediate frequency furnace, and cool in the cooling section to obtain vanadium nitride.

[0058] Said typical but non-limiting examples are as follows:

Embodiment 1

[0060] (1) Mix 1000kg vanadium trioxide, 240kg graphite and 99.2kg water to make pellets, wherein the weight ratio of vanadium trioxide and graphite is 1:0.24, and the amount of water is vanadium trioxide and graphite 8wt% of the total mass;

[0061] (2) Put the prepared pellets into the vertical intermediate frequency furnace after drying and sieving, and the flow rate from the bottom of the cooling section is 200m 3 / h nitrogen, the pellets move from top to bottom in the vertical intermediate frequency furnace, and the central temperature of the heating section is kept at 1500°C. After the pellets react in the heating section of the vertical intermediate frequency furnace for 30 hours, they enter the cooling section for cooling, and the cooling section is controlled The temperature of the upper part is 1000°C, the temperature of the lower part is 80°C, and the material is discharged to obtain high-nitrogen vanadium nitride.

[0062] The composition of the vanadium nitride o...

Embodiment 2

[0064] (1) 1000kg vanadium pentoxide, 330kg graphite and 160kg water are mixed and pressed to make pellets, wherein the weight ratio of vanadium pentoxide and graphite is 1:0.33, and the consumption of water is the total amount of vanadium pentoxide and graphite. 12% by mass;

[0065] (2) Put the prepared pellets into the vertical intermediate frequency furnace after drying and sieving, and the flow rate from the bottom of the cooling section is 120m 3 / h nitrogen, the pellets move from top to bottom in the vertical intermediate frequency furnace, and the central temperature of the heating section is kept at 1400°C. After the pellets react in the heating section of the vertical intermediate frequency furnace for 20 hours, they enter the cooling section for cooling, and the cooling section is controlled The upper temperature is 800°C, the lower temperature is 150°C, and the material is discharged to obtain high-nitrogen vanadium nitride.

[0066] The composition of the vanadiu...

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Abstract

The invention provides a preparation method of high-nitrogen vanadium nitride. The preparation method comprises the following steps: (1) vanadium oxide, a carbon reducing agent and water are mixed and pressed to prepare pellets; (2) the prepared pellets are put in a vertical medium-frequency furnace; nitrogen with a flow of 80-200 m3 / h is introduced; and the pellets move in the vertical medium-frequency furnace from top to bottom, are reacted by a heating section in the vertical medium-frequency furnace, and are cooled by a cooling section to prepare vanadium nitride. The preparation method adopts the vertical medium-frequency furnace to supply the stable reaction atmosphere and reaction process, uses the valence state of vanadium in vanadium oxide as basis for precisely controlling the carbon content in the product, can reduce the ratio of carbon in the product to the greatest extent, guarantees the promotion space of the nitrogen content in the product, and prepares high-nitrogen vanadium nitride through controlling such process conditions as fresh pellet quality, reaction temperature in each phase and nitrogen flow.

Description

technical field [0001] The invention belongs to the field of steel alloy production, and relates to a preparation method of vanadium nitride, in particular to a preparation method of high-nitrogen vanadium nitride. Background technique [0002] Adding vanadium to low-alloy high-strength steel can increase the strength of the steel, improve the recrystallization temperature and high-temperature performance of the material. 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 heat resistance and short-term creep resistance. For every 10ppm nitrogen added in vanadium steel, the strength of steel can be improved. 6MPa. Vanadium nitride can add vanadium and nitrogen to molten steel at the same time, and the production of high-nitrogen vanadium nitride products can reduce the amount of vanadium without reducing the strength of the steel, thereby reducing the cost of steelmaking. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C35/00C22C27/02C22C29/16C22C30/00C22C1/00
CPCC22C1/00C22C27/025C22C29/16C22C30/00C22C35/00
Inventor 李九江陈东辉朱立杰李东明贾立根白瑞国
Owner HEBEI IRON AND STEEL
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