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Method for preparing alloy of vanadium nitride

A technology of vanadium nitride alloy and vanadium compound is applied in the production field of vanadium nitride alloy, which can solve the problems of large energy consumption and furnace body loss, affecting the effective diffusion of nitrogen, and high production cost, saving energy and reducing equipment investment costs. , the effect of low carbon content

Inactive Publication Date: 2007-07-25
蔡惜辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned technical process for producing vanadium nitride, because the material is pressed into a block state for nitriding reaction, affects the effective diffusion of nitrogen in the material, resulting in a low nitriding rate
At the same time, these processes must be nitrided at a high temperature above 900 °C without exception, resulting in large energy consumption and furnace body loss, large equipment investment, and high production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh equivalent to V 2 o 5 Amount of 11% activated carbon, with V 2 o 5 Mix well. Lay the mixed material in a thin layer on the feeder tray of the multi-layer tray structure, and the automatic device pushes the feeder cart into the pre-reduction section. Feed flowing NH into the preparation furnace 3 -N 2Mixed gas, the nitrogen gas integral fraction in the mixed gas is 5%, the temperature is raised to 600-650°C, and after holding for 0.5 hours, the feed truck enters the nitriding section, the temperature rises to 710-770°C, and the heat preservation is held for 8 hours. The feed car enters the cooling section, and is automatically released after being cooled to 60°C under the protection of flowing mixed gas to obtain vanadium nitride alloy powder containing 78.2% vanadium, 18.07% nitrogen, and 6.22% carbon.

Embodiment 2

[0026] Weigh equivalent to NH 4 VO 3 The amount of 4.5% charcoal powder, with NH 4 VO 3 After fully mixing and evenly laying on the material tray of the feeding car, the feeding car enters the pre-reduction section of the preparation furnace. Access to NH 3 -N 2 Mixed gas, the integral fraction of nitrogen gas in the mixed gas is 1%, the furnace temperature rises to 450-500°C and keeps constant for 0.5 hours; then enters the nitriding section, the temperature is 750-820°C, keeps warm for 6 hours, and cools to 80°C in the cooling section Automatically baked. The powder contains 78.3% vanadium, 15.12% nitrogen and 2.98% carbon.

Embodiment 3

[0028] Weigh graphite powder equivalent to 8% of the weight of ammonium polyvanadate, fully mix it with ammonium polyvanadate, spread it on the feeding tray of the feeding cart, and push the feeding cart into the pre-reduction section of the preparation furnace. Access to NH 3 Gas, the furnace temperature rises to 550-600 ℃ for 1 hour; then enters the nitriding section, the temperature is 780-840 ℃, keeps the temperature for 4.5 hours, and then automatically comes out of the furnace after cooling to 120 ℃ in the cooling section. The powder contains 77.8% vanadium, 13.51% nitrogen and 5.48% carbon.

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PUM

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Abstract

This invention discloses a method for preparing VN alloy. The method comprises: utilizing powdery V2O5, NH4VO3 or poly(ammonium vanadate) as the raw material, mixing with carbonaceous powder, sending into a reactor continuously, introducing NH3 or mixed NH3-N2 with N2 volume percentage lower than 5%, reducing, carbonizing and nitriding at 400-850 deg.C for 4-10 h, cooling to 50-150 deg.C, discharging to obtain powdery VN alloy product, mixing with binder uniformly, pressing and drying to form blocks. The product comprises N13-18.5%, C 2-9%, and V 77-81%.

Description

technical field [0001] The invention relates to a production method of vanadium nitride alloy. Background technique [0002] Vanadium, niobium, titanium and other micro-alloyed steels are widely and rapidly used in the world, and its output currently accounts for 10-15% of the global steel output. The production of microalloyed steel in my country started late, and currently accounts for about 5% of the national steel output. Microalloying provides an economical and effective way and opportunity for the upgrading of steel products in my country. [0003] Compared with the application of vanadium iron alloy, the application of vanadium nitride (VN) alloy developed in recent years can improve the performance of steel better. For every 10PPM nitrogen added in vanadium steel, the strength of steel can be increased by 6Mpa. Production shows that adding VN alloys to steel can save 20-40% of vanadium than adding vanadium-iron alloys, which not only saves scarce vanadium resources...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C29/16
Inventor 蔡惜辉
Owner 蔡惜辉
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