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Method for preparing nitrided ferrovanadium

A technology of ferrovanadium nitride and iron powder, which is applied in the field of metallurgy, can solve the problems of large vanadium slag, vanadium loss, high energy consumption and high cost, and achieve the effects of high vanadium utilization rate, resource saving and environmental protection

Inactive Publication Date: 2018-03-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing ferrovanadium nitride preparation process is to carry out liquid or solid nitriding to ferrovanadium, but the production process of ferrovanadium has high energy consumption and cost, and will produce a large amount of vanadium slag, resulting in vanadium loss

Method used

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  • Method for preparing nitrided ferrovanadium
  • Method for preparing nitrided ferrovanadium
  • Method for preparing nitrided ferrovanadium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The method for preparing ferrovanadium nitride of the present embodiment comprises the following steps:

[0038] Step 1, place V 2 O 5 The powder, iron powder and carbon powder were all dried at 100~105℃ for 1h, and then the V 2 O 5 Sieve powder, iron powder and carbon powder to 200 mesh;

[0039] Step 2, place the dry V 2 O 5 Powder, iron powder and carbon powder are mixed evenly, V 2 O 5 The mass ratio of powder to toner is 1:0.38, V 2 O 5 The mass ratio of powder to iron powder is 1:0.45, then 4% water by mass is added to the mixture for wet mixing, and then the wet mixture is pressed on a powder press with a pressing pressure of 8 MPa, and then pressed The samples were dried in a drying oven, the drying temperature was 100-105 °C, and the drying time was 4 hours to obtain the samples;

[0040] Step 3, put the sample into a tubular heating furnace, and heat it up to 650 °C at a rate of 10 °C / min for pre-reduction. During pre-reduction, the nitrogen flow rat...

Embodiment 2

[0045] The method for preparing ferrovanadium nitride of the present embodiment comprises the following steps:

[0046] Step 1, place V 2 O 5 The powder, iron powder and carbon powder were all dried at 100~105℃ for 1.5h, and then the V 2 O 5 Sieve powder, iron powder and carbon powder to 180 mesh;

[0047] Step 2, place the dry V 2 O 5 Powder, iron powder and carbon powder are mixed evenly, V 2 O 5 The mass ratio of powder to toner is 1:0.30, V 2 O 5 The mass ratio of powder to iron powder is 1:0.50, then 2% by mass of water is added to the mixture for wet mixing, and then the wet mixture is pressed on a powder press with a pressing pressure of 8.5 MPa, and then the pressing The good samples are dried in a drying oven, the drying temperature is 100-105 °C, and the drying time is 2 hours to obtain the samples;

[0048] Step 3, put the sample into the tubular heating furnace, and heat it up to 650 °C at a rate of 10 °C / min for pre-reduction. During pre-reduction, the n...

Embodiment 3

[0053] The method for preparing ferrovanadium nitride of the present embodiment comprises the following steps:

[0054] Step 1, place V 2 O 5 The powder, iron powder and carbon powder were all dried at 100-105 ℃ for 2 hours, and then the V 2 O 5 Sieve powder, iron powder and carbon powder to 200 mesh;

[0055] Step 2, place the dry V 2 O 5 Powder, iron powder and carbon powder are mixed evenly, V 2 O 5 The mass ratio of powder to toner is 1:0.37, V 2 O 5 The mass ratio of powder to iron powder is 1:0.4, and then 3% of water by mass is added to the mixture for wet mixing, and then the wet mixture is pressed on a powder press with a pressing pressure of 9MPa, and then pressed The samples were dried in a drying oven, the drying temperature was 100-105 °C, and the drying time was 3 hours to obtain the samples;

[0056] Step 3, put the sample into a tubular heating furnace, and heat it up to 660 °C at a rate of 10 °C / min for pre-reduction. During pre-reduction, the nitrog...

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Abstract

The invention discloses a method for preparing nitrided ferrovanadium. The method comprises the following steps that (1), a sample fabricated by uniformly mixing and pressing vanadium oxide powder, iron powder and carbon powder is subjected to prereduction through the nitrogen gas in a heating furnace, in the prereduction process, the temperature in the heating furnace is 650 + / -20 DEG C, the nitrogen gas flow is 150-180 L / h, and the heat preservation time of the heating furnace is 3-5 hours; (2), after heat preservation in step (1) is finished, the temperature of the heating furnace is then increased to 1200-1500 DEG C to perform final reduction on the sample, in the final reduction process, the nitrogen gas flow in the heating furnace is 150-180 L / h, and the heat preservation time of theheating furnace is 2-3 hours; (3), after heat preservation in step (2) is finished, the sample is cooled along with the furnace in the atmosphere of the nitrogen gas, and an obtained product is the nitrided ferrovanadium. According to the method, the vanadium oxide powder serves as the raw material, the iron powder serves as the iron source, the carbon powder serves as a reducing agent, the nitrogen gas is introduced into the heating furnace for reaction, and the method has the advantages that the procedure is simple, no vanadium slag is generated, the vanadium utilization rate is high, resources are saved, the environment is protected, and the production cost can be lowered.

Description

technical field [0001] The invention belongs to the technical field of metallurgy technology, and relates to a method for preparing ferrovanadium nitride. Background technique [0002] Vanadium added to steel can play the role of grain refinement and precipitation strengthening. It is an important additive for microalloying in steel. Its addition forms include vanadium-based alloys such as ferrovanadium, vanadium nitride and ferrovanadium nitride. Relatively speaking, ferrovanadium nitride contains iron and has a larger specific gravity, so it can pass through the slag layer more effectively, and the microalloying effect is better. The existing preparation process of ferrovanadium nitride is to carry out liquid or solid nitriding of ferrovanadium, and the production process of ferrovanadium has high energy consumption and cost, and will generate a large amount of vanadium slag, resulting in vanadium loss. SUMMARY OF THE INVENTION [0003] In order to solve the problems ex...

Claims

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Application Information

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IPC IPC(8): C22C35/00C22C29/16C22C1/05
CPCC22C35/00C22C1/051C22C29/16
Inventor 朱军王斌王欢杜金晶刘新运
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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