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Method for increasing nitrogen content of vanadium-nitrogen alloy

A vanadium-nitrogen alloy and nitrogen content technology, which is applied in the field of vanadium-containing oxide smelting, can solve the problems of large fluctuation range of nitrogen content, small scale output and high cost, and achieves low preparation cost and energy consumption, simple production and high price. low cost effect

Active Publication Date: 2010-04-14
PANGANG GRP PANZHIHUA STEEL & VANADIUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are also the problems of large fluctuation range of nitrogen content, low production capacity, high cost, and small scale output

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Grind 1000kg of vanadium tetroxide and vanadium pentoxide powder with a vanadium content of 60% finely to -100 mesh, add 300kg of graphite, 5kg of iron powder, 5kg of polyvinyl alcohol, 5kg of ferrous carbonate, and dry mix 25 minutes until uniform, add appropriate amount of water and wet mix for 25 minutes until uniform; apply a pressure of 9MPa to the wet-mixed mixture and press it into a 50 mm × 50 mm × 30 mm wet block, and the wet block is at 200 ° C. Heating and drying for 50 hours to obtain a dry block; the dry block is carbonized at atmospheric pressure and high temperature and calcined in a nitriding furnace. The calcination temperature is 1550°C, and the calcination time is 28 hours. The sintered block is cooled to below 100°C with the furnace After being released from the furnace, a vanadium-nitrogen alloy product with a nitrogen content of 17.50% was obtained.

[0038] In this embodiment, because the nitriding accelerator is added, the output of the vanadium-...

Embodiment 2

[0040] Finely grind 1000kg of a mixture of vanadium trioxide and vanadium tetroxide powder with a vanadium content of 61% to -100 mesh, add 290kg of carbon black, 6kg of iron powder, 7kg of flour, and 6kg of ammonium chloride, and dry mix for 25 minutes until uniform, add an appropriate amount of water and wet mix for 25 minutes until uniform; apply a pressure of 9 MPa to the wet-mixed mixture and press it into a wet material block of 50 mm × 50 mm × 30 mm, and heat the wet material block at 200 ° C. Dry for 50 hours to obtain a dry block; carbonize the dry block at high temperature under normal pressure and calcine in a nitriding furnace. The calcination temperature is 1550°C, and the calcination time is 28 hours. The sintered block is cooled to below 100°C with the furnace and released. A vanadium-nitrogen alloy product with a nitrogen content of 16.80% is obtained.

[0041] In this embodiment, because the nitriding accelerator is added, the output of the vanadium-nitrogen a...

Embodiment 3

[0043] Finely grind 1000kg of vanadium tetroxide powder with a vanadium content of 62% to -200 mesh, add 285kg of graphite, 7kg of iron powder, 9kg of polyvinyl alcohol, and 8kg of ammonium sulfate, dry mix for 25 minutes until uniform, and add an appropriate amount of water Wet mix for 25 minutes until uniform; apply a pressure of 9 MPa to the wet-mixed mixture and press it into a wet material block of 50 mm × 50 mm × 30 mm. The wet material block is heated at 200 ° C and dried for 50 hours to obtain a dry material block; carry out atmospheric pressure high temperature carbonization of the dry block and calcination in the nitriding furnace, the calcination temperature is 1550°C, the calcination time is 28 hours, the sintered block is cooled to below 100°C with the furnace, and the nitrogen content of % vanadium nitrogen alloy products.

[0044] In this embodiment, the output of vanadium-nitrogen alloy per 24 hours is 1570 kg due to the addition of the nitriding accelerator, w...

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PUM

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Abstract

The invention discloses a method for increasing the nitrogen content of vanadium-nitrogen alloy, comprising the following steps of adding a nitridation accelerator into a mixture comprising vanadium oxide, a carburizing agent, catalyst and a bonding agent, making material blocks, and heating the material blocks for gasifying or decomposing the nitridation accelerator to generate gas and form crisscrossed micro holes or channels in the material blocks. The nitrogen content is greatly increased as nitrogen in the nitridation reaction enters the inside of the material blocks through the holes or channels to participate in the reaction to result in completion of the nitridation reaction. Compared with the prior art, the invention solves the problems of accelerating carburization and intensifying nitridation from the carburization and oxidation mechanisms of vanadium-nitrogen alloy through adding nitridation accelerators into materials, thereby greatly increasing the nitrogen content of the vanadium-nitrogen alloy and simultaneously reducing the general production cost and energy consumption of the vanadium-nitrogen alloy.

Description

technical field [0001] The invention relates to the technical field of vanadium-containing oxide smelting. In particular, it relates to a method for increasing the nitrogen content of the vanadium-nitrogen alloy by adding a nitriding accelerator to the vanadium-containing oxide. Background technique [0002] At present, vanadium-nitrogen alloys are prepared by adding reducing agents to vanadium oxides, and reducing, calcining or smelting in various smelting furnaces. The oxides of vanadium are usually vanadium pentoxide and vanadium trioxide, which are prepared by adding a carbonizing agent, mixing, pressing, molding and drying, and then carbonizing or nitriding under high temperature conditions. The biggest disadvantage of this method is that the nitrogen content of the product vanadium-nitrogen alloy (or vanadium nitride) is unstable and fluctuates greatly, and products with higher nitrogen content cannot be stably produced. [0003] The main principle followed by the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/16C22C1/04C01B21/06
Inventor 李千文张满园胡力全兴强牟莲红
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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