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Production method for vanadium nitride ferroalloy

A ferro-vanadium nitride alloy and production method technology, applied in metal material coating technology, solid-state diffusion coating, coating, etc., can solve the problems of affecting the effective diffusion of nitrogen, low production efficiency, long production cycle, etc., and achieve product quality The effects of stability, high production efficiency, and high labor productivity

Inactive Publication Date: 2012-08-22
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Liquid nitriding is to put the qualified ferrovanadium melt smelted in the electric furnace into the ladle with bottom air hole bricks, and at the same time inject nitrogen gas for liquid nitriding to obtain ferrovanadium nitride. The advantage is that the process method and equipment are simple, Easy to implement, but the disadvantage is that the nitrogen content of the product is low, averaging 1%-1.2%
The problem that this kind of method exists is: produce vanadium ferroalloy, material is to carry out nitriding reaction in furnace in block form, has influenced the effective diffusion of nitrogen in material, and energy consumption is high; And production is intermittent, and production cycle Longer, less productive

Method used

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  • Production method for vanadium nitride ferroalloy
  • Production method for vanadium nitride ferroalloy
  • Production method for vanadium nitride ferroalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix 5,000 grams of vanadium-iron alloy powder containing 54.2% vanadium into a ball mill, pass through a 80-mesh screen, put the powdered material after mixing into a graphite tank coated with lime powder, and place the graphite tank in the pusher kiln. In the feeding bin, the material is controlled by PLC, automatically enters and exits the pusher kiln, and is heated by electrodes on the outside of the pusher kiln, and the inside is 220m 3 Nitrogen per hour, the pressure in the kiln is kept at 0.6-0.7MPa, and the high-temperature nitriding and sintering reactions are carried out. After the powdery material enters the kiln for 28 hours, it is automatically released from the furnace and cooled under the protection of nitrogen to obtain ferrovanadium nitride. The composition is: V : 43.78%, N: 9.03%, C: 1.34%, Si: 0.99%, P: 0.071%, Al: 1.35%, Mn: 0.29%.

Embodiment 2

[0025] Mix 4800 grams of vanadium-containing 80.2% powder, 400 grams of vanadium oxide, and 350 grams of graphite powder into a ball mill, pass through a 120-mesh sieve, and put the powdered material after mixing into a graphite tank coated with lime powder. Put the graphite material tank in the feeding bin of the tunnel kiln, so that the material is controlled by PLC, automatically enters and exits the tunnel kiln, is heated outside the tunnel kiln, and passes through 240m inside 3 Nitrogen per hour, the pressure in the kiln is maintained at 0.7-0.8MPa, and the carbon heat, nitriding and sintering reactions are carried out. After the powdery material enters the kiln for 16 hours, it is automatically released from the furnace and cooled under the protection of nitrogen to obtain ferrovanadium nitride. Its composition is : V: 70.83%, N: 13.59%, C: 1.46%, Si: 1.75%, P: 0.051%, Al: 1.60%, Mn: 0.42%.

Embodiment 3

[0027] Mix 3,860 grams of vanadium oxide containing 63.5% vanadium, 550 grams of graphite powder, and 1,700 grams of iron powder into a ball mill, pass through a 100-mesh sieve, and put the mixed powder into a ceramic material tank coated with lime powder , put the ceramic material tank in the feeding bin of the pusher kiln, so that the material is controlled by PLC, automatically enters and exits the pusher kiln, is heated outside the pusher kiln, and the inside is 230m 3 Nitrogen per hour, the pressure in the kiln is maintained at 0.4-0.5MPa, and the carbon heat, nitriding and sintering reactions are carried out. After the powdery material enters the kiln for 16 hours, it is automatically released from the furnace and cooled under the protection of nitrogen to obtain ferrovanadium nitride. Its composition is : V: 49.28%, N: 10.46%, C: 1.78%, Si: 1.02%, P: 0.049%, Al: 0.60%, Mn: 0.36%.

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Abstract

The invention relates to a production method for a vanadium nitride ferroalloy and belongs to the technical field of chemical metallurgy. The technical scheme provided by the invention is that the production method comprises the following steps of: 1-, performing crushing and fine grinding on a raw material after entering a ball mill; 2-, putting the powdery material after being finely ground in a reaction vessel coated with an anti-sticking agent, and then, delivering the reaction vessel filled with the powdery material into a preparation furnace; 3-, introducing reaction gas into the furnace; heating the preparation furnace, and performing a nitriding reaction and a sintering reaction on the powdery material in the preparation furnace; and 4-, discharging under the nitrogen protection for cooling to obtain the vanadium nitride ferroalloy. According to the production method for the vanadium nitride ferroalloy, a pre-reduction reaction, a carbonization reaction and the nitriding reaction are performed on the raw material in the preparation furnace in the manner of powder, and the three reactions are realized in the same equipment furnace, thereby, the production efficiency is high. Briquetting is not needed, and thus, the speed of the nitriding reaction is accelerated; the required reaction temperature is low; the energy consumption is low; and the equipment operating rate and the labor productivity are high. The production method for the vanadium nitride ferroalloy is more suitable for large-scale industrial production. Vacuum equipment is not needed; the raw material completely reacts in the manner of powder; the product quality is stable; and the vanadium yield is high.

Description

technical field [0001] The invention relates to a production method of vanadium-iron alloy and belongs to the technical field of chemical industry and metallurgy. Background technique [0002] Vanadium nitride, like ferrovanadium, is an important vanadium alloy additive. Adding it to steel can improve the comprehensive mechanical properties of steel such as wear resistance, toughness, strength, hardness, ductility and fatigue resistance, and make steel have good Compared with ferrovanadium, vanadium nitride alloy can save 20-40% vanadium and reduce production cost. The use of ferrovanadium nitride has the advantages of both vanadium nitride and ferrovanadium, and the vanadium yield is higher than that of vanadium-iron alloying or vanadium nitride alloying, and using vanadium-iron alloy, the amount of vanadium is lower, and the strength and toughness of the steel are higher. High, has a good application prospect. At present, the methods for preparing nitrogen-containing all...

Claims

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Application Information

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IPC IPC(8): C22C29/16C22C1/04C23C8/24
Inventor 李秀雷马瑞峰李东明卢永杰卢明亮豆长宏付美玲
Owner HEBEI IRON AND STEEL
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