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Method for anti-adhesion nitrogen increase in the process of producing vanadium nitride

A production process, vanadium nitride raw material technology, applied in the field of vanadium nitride alloy production, to achieve the effect of preventing sticking, improving apparent quality, and preventing sintering sticking problems

Active Publication Date: 2011-08-03
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for anti-adhesion and nitrogen increase in the production process of vanadium nitride, using graphite powder as anti-adhesion and isolation protection material, which plays the role of anti-adhesion and nitrogen increase in the production process of vanadium nitride, without affecting The quality of the product not only effectively solves the bonding problem between products in the production process of vanadium nitride, improves the apparent quality and yield of the product, but also moderately increases the nitrogen content in the product, improves the grade and pass rate of the product, and solves the problem of The above-mentioned problems existing in the background technology

Method used

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  • Method for anti-adhesion nitrogen increase in the process of producing vanadium nitride
  • Method for anti-adhesion nitrogen increase in the process of producing vanadium nitride
  • Method for anti-adhesion nitrogen increase in the process of producing vanadium nitride

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Effect test

Embodiment 1

[0022] Dry or dry the raw meal balls extruded by the ball briquetting machine, put them into the graphite powder and put them into the pusher kiln for firing. The thickness of the sticky graphite powder is about 0.01mm. Put the raw meal balls pretreated in this way into the furnace Firing, the vanadium nitride product with greatly improved bonding was obtained, and vanadium nitride containing 12.78% nitrogen was obtained. content increased by 1.02 percentage points.

Embodiment 2

[0024]Put the freshly extruded raw meal balls directly into the graphite powder, and the thickness of the sticky graphite powder is about 1mm. Put the raw meal balls pretreated in this way into the furnace and burn them to obtain unbonded vanadium nitride product, but at this time there is unreacted residual graphite powder on the surface of the product, which can be effectively removed by compressed air blowing, etc., and vanadium nitride with a nitrogen content of 13.96% is obtained, which is the same as that of the untreated product of the same batch of raw pellets with a nitrogen content of 11.76%. % of vanadium nitride, the nitrogen content increased by 2.2 percentage points.

Embodiment 3

[0026] Put the newly extruded raw material balls from the briquetting machine directly into the graphite powder. At this time, the thickness of the sticky graphite powder is about 1mm. Dry or dry the sticky pellets and put them in the furnace with a fork, which can be used Part of the graphite powder fell off from the surface of the raw meal balls, and the raw meal balls pretreated in this way were fired in the furnace. At this time, the product obtained had only a small amount of bonding, and the vanadium nitride with a nitrogen content of 14.54% was obtained, which was the same as that of the same batch of raw meal balls. Compared with the vanadium nitride containing 11.76% nitrogen, the nitrogen content increased by 2.78 percentage points.

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Abstract

The invention relates to a method for anti-adhesion nitrogen increase in the process of producing vanadium nitride, and belongs to the technical field of vanadium nitride alloy production. The technical scheme comprises the following steps of: pretreating raw pellets before the vanadium nitride raw pellets enters a furnace to be fired, and putting the raw pellets into graphite powder, wherein a pretreatment method of sticking and coating the graphite powder on the surface is adopted, and the graphite powder is taken as an anti-adhesion material; and putting the raw pallets uniformly stuck with the graphite powder into a reaction furnace for firing. By the method, the problem of adhesion among products in the process of producing vanadium nitride can be effectively solved, the appearance quality of the products and the finished product ratio are improved, the surface area of nitriding reaction can be increased by 1 / 8 to 1 / 2 when the vanadium nitride pellets are fired, and the graphite powder on the surfaces of the pellets can consume partial residual oxygen and protect vanadium carbide / vanadium nitride in the pellets so as to prevent the vanadium carbide / vanadium nitride from being oxidized, improve the nitrogen content in the products and improve the grade and yield of the products. The method is suitable for all vanadium nitride production modes, particularly production of vanadium nitride by the most mature horizontal pusher kiln method at present.

Description

technical field [0001] The invention relates to a method for preventing caking and increasing nitrogen during the production process of vanadium nitride, and belongs to the technical field of vanadium nitride alloy production. Background technique [0002] With the application of microalloying technology in the iron and steel industry, vanadium has been widely used in low alloy high strength steel. Vanadium can form fine vanadium carbide or vanadium nitride precipitation in low-alloy high-strength steel, which can not only effectively promote the grain refinement and strengthening of steel, but also pin dislocations and grain boundaries, hinder dislocation and grain boundary migration, and improve The strength, improve the recrystallization temperature and high temperature performance of the material. Nitrogen is a very beneficial alloying element in vanadium-containing microalloy steel. Adding nitrogen in steel can strengthen the precipitation of vanadium, change the inter...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B5/10C22B1/00
Inventor 陈东辉朱立杰李九江栗金刚曲晓昕
Owner HEBEI IRON AND STEEL
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