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Method for preparing vanadium nitride

A technology of vanadium nitride and nitrogen, applied in the field of metallurgy, can solve the problems of low heat utilization rate, environmental pollution and high energy consumption, and achieve the effects of uniform reduction reaction, low raw material cost and simplified production process

Active Publication Date: 2018-02-09
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, vanadium pentoxide and vanadium trioxide are used to prepare vanadium nitride both at home and abroad. The heat utilization rate is not high, and there are problems such as long process, high energy consumption, and environmental pollution.

Method used

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  • Method for preparing vanadium nitride

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Embodiment 1

[0032] The method for preparing vanadium nitride of the present embodiment may further comprise the steps:

[0033] Step 1, drying the ammonium metavanadate powder and carbon powder at 100-105°C for 1-2 hours, and then sieve the ammonium metavanadate powder and carbon powder to 200 mesh with a standard inspection sieve;

[0034] Step 2, mix the dry ammonium metavanadate powder and carbon powder evenly, wherein the mass ratio of ammonium metavanadate to carbon powder is 1:0.256, then add 5% water by mass to the mixture and mix well , and then press the mixture into a cylindrical sample of Ф15mm×10mm by a desktop powder tablet press at 8MPa, and then dry the pressed sample in an electric blast drying oven at 100-105°C for 3 hours;

[0035] Step 3, put the sample into the tubular heating furnace, and conduct the heating furnace at 200°C: step a, vacuumize and feed nitrogen; step b, then stop feeding nitrogen to vacuum the heating furnace; step c, repeat Step a and step b 3 times...

Embodiment 2

[0040] The method for preparing vanadium nitride of the present embodiment comprises the steps:

[0041] Step 1, drying the ammonium metavanadate powder and carbon powder at 100-105°C for 1-2 hours, and then sieve the ammonium metavanadate powder and carbon powder to 200 mesh with a standard inspection sieve;

[0042] Step 2, mix the dry ammonium metavanadate powder and carbon powder evenly, wherein the mass ratio of ammonium metavanadate to carbon powder is 1:0.25, then add 6% water by mass to the mixture and mix well , and then press the mixture into a cylindrical sample of Ф15mm×10mm by a desktop powder tablet press at 8MPa, and then dry the pressed sample in an electric blast drying oven at 100-105°C for 3.5 hours;

[0043]Step 3, put the sample into the tubular heating furnace, and conduct the heating furnace at 200°C: step a, vacuumize and feed nitrogen; step b, then stop feeding nitrogen to vacuum the heating furnace; step c, repeat Step a and step b twice, and then he...

Embodiment 3

[0048] The method for preparing vanadium nitride of the present embodiment may further comprise the steps:

[0049] Step 1, drying the ammonium metavanadate powder and carbon powder at 100-105°C for 1-2 hours, and then sieve the ammonium metavanadate powder and carbon powder to 200 mesh with a standard inspection sieve;

[0050] Step 2, mix the dry ammonium metavanadate powder and carbon powder evenly, wherein the mass ratio of ammonium metavanadate to carbon powder is 1:0.27, then add 7% water by mass to the mixture and mix well , and then press the mixture into a cylindrical sample of Ф15mm×10mm by a desktop powder tablet press at 8MPa, and then dry the pressed sample in an electric blast drying oven at 100-105°C for 4 hours;

[0051] Step 3, put the sample into the tubular heating furnace, and conduct the heating furnace at 200°C: step a, vacuumize and feed nitrogen; step b, then stop feeding nitrogen to vacuum the heating furnace; step c, repeat Step a and step b 4 times,...

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Abstract

The invention discloses a method for preparing vanadium nitride, which comprises the following steps: step 1, carrying out pre-reduction on a test specimen prepared from ammonium metavanadate powder and carbon powder in a heating furnace by nitrogen, wherein in the pre-reduction process, a temperature in the heating furnace is 650 to 670 DEG C, nitrogen flow is 210 to 270mL / min, and heat preservation time of the heating furnace is 2 to 4 hours; step 2, after ending heat preservation in the step S1, warming the heating furnace to a temperature of 1,300 to 1,500 DEG C and carrying out final reduction on the test specimen, wherein the final reduction process, nitrogen flow in the heating furnace is 210 to 270mL / min, and heat preservation time of the heating furnace is 4 to 5 hours; step 3, after ending heat preservation in the step S2, carrying out furnace cooling on the test specimen in nitrogen atmosphere, so that the obtained test specimen is the vanadium nitride. According to the method disclosed by the invention, the vanadium nitride is prepared by the ammonium metavanadate, so that a calcination section can be omitted, and the aims of simplifying a production process, reducing production cost of an enterprise and reducing pollution are fulfilled.

Description

【Technical field】 [0001] The invention belongs to the technical field of metallurgy and relates to a method for preparing vanadium nitride. 【Background technique】 [0002] Vanadium nitride, as an important steel-making alloy additive, can significantly improve the comprehensive performance of steel. 80% to 90% of vanadium is used in the steel industry, and vanadium plays a role in grain refinement and precipitation strengthening in steel. Compared with other vanadium-based alloys, adding vanadium nitride to steel can effectively utilize the strong affinity between vanadium and nitrogen, which can not only improve the strength of steel, but also reduce the addition of vanadium as an alloying element and reduce production cost. At present, vanadium pentoxide and vanadium trioxide are used to prepare vanadium nitride both at home and abroad. The heat utilization rate is not high, and there are problems such as long process, high energy consumption, and environmental pollution....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06
CPCC01B21/0617C01P2006/10
Inventor 朱军王斌程国鹏杜金晶刘新运
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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