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A kind of method for preparing ferrosilicon vanadium nitride

A technology of vanadium silicon nitride and vanadium trioxide, applied in the field of ferroalloy, can solve the problems of incomplete reaction, high production cost, high residual oxygen content, etc., and achieve the effect of improving market competitiveness, good economic benefits, and wide source of raw materials

Active Publication Date: 2021-01-15
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above method mostly uses the calcination reaction of vanadium oxide and ferrosilicon to carry out in solid state, and there are problems such as incomplete reaction, insufficient nitrogen enrichment, high residual oxygen content, low apparent density, and many types of raw materials for production; the calcination reaction of ferrosilicon and ferrosilicon In the solid state, the aforementioned problems still exist, and the production cost is higher
Moreover, the melting point of ferrosilicon or ferrosilicon vanadium is low, and it is easy to melt prematurely in the preparation process to form a coating on the material, which makes it difficult for nitrogen to enter and nitriding reaction with other raw materials, and finally it is difficult to obtain qualified vanadium ferrosilicon nitride products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]This embodiment provides a production method for preparing silicon nitride ferro-vanadium, and the method includes the following steps:

[0037](1) Put the raw materials 80kg vanadium trioxide, 29kg graphite, 25kg iron powder, 20kg silica powder and water into the mixer to mix and press the ball, and dry and screen the green pellets;

[0038](2) Put the pellets obtained in step (1) into a pusher kiln for firing, and control the flow of nitrogen gas to 100m during the firing process3 / h, the center temperature of the nitriding section is 1450℃, keep for 3 hours, then cool, the upper temperature of the cooling section is 900℃, the lower temperature of the cooling section is ≤150℃, the residence time of the raw materials in the nitriding section is 20h, Produced silicon nitride iron vanadium products.

[0039]The main components of the obtained ferro-silicon-vanadium nitride are shown in Table 1:

[0040]Table 1

[0041] element VFe NCOSSi content(%) 50.7824.8111.422.491.610.058.20

Embodiment 2

[0043]This embodiment provides a production method for preparing silicon nitride ferro-vanadium, and the method includes the following steps:

[0044](1) Put the raw materials 80kg vanadium trioxide, 30kg graphite, 25kg iron powder, 20kg silica powder and water into the mixer to mix and press the ball, and dry and screen the green pellets;

[0045](2) Put the pellets obtained in step (1) into a pusher kiln for firing, and control the flow of nitrogen gas to 150m during firing3 / h, the center temperature of the nitriding section is 1450℃, keep for 3 hours, then cool, the upper temperature of the cooling section is 800℃, the lower temperature of the cooling section is ≤150℃, the residence time of the raw materials in the nitriding section is 16h, Produced silicon nitride ferro-vanadium products.

[0046]The main components of the obtained silicon nitride ferro-vanadium are shown in Table 2:

[0047]Table 2

[0048] element VFe NCOSSi content(%) 50.7824.8112.422.600.800.048.25

Embodiment 3

[0050]This embodiment provides a production method for preparing silicon nitride ferro-vanadium, and the method includes the following steps:

[0051](1) Put the raw materials 80kg vanadium trioxide, 31kg graphite, 25kg iron powder, 20kg silica powder and water into the mixer to mix and press the ball, and dry and screen the green pellets;

[0052](2) Put the pellets obtained in step (1) into a pusher kiln for firing, and control the flow of nitrogen gas to 200m during firing3 / h, the center temperature of the nitriding section is 1450℃, keep for 3 hours, then cool, the upper temperature of the cooling section is 900℃, the lower temperature of the cooling section is ≤150℃, the residence time of the raw materials in the nitriding section is 20h Produced silicon nitride ferro-vanadium products.

[0053]The main components of the obtained silicon nitride ferro-vanadium are shown in Table 3:

[0054]table 3

[0055] element VFe NCOSSi content(%) 50.7024.4212.802.200.500.0358.10

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Abstract

The invention relates to a method for preparing ferrosilicon vanadium nitride. The method comprises the following steps: mixing and pelletizing a vanadium source, a reducing agent, an iron source, silica powder and water, and drying obtained pellets; and calcining the dried pellets in a nitrogen atmosphere to obtain the ferrosilicon vanadium nitride. The silica powder is used as a silicon source,so the problem of difficult nitriding reaction caused by material coating due to too early melting of conventional ferrosilicon or vanadium iron in the preparation process is solved, and full reactionof nitrogen and other raw materials is ensured; and a ratio among raw material components is adjusted, the synergistic effects of the silica powder, elemental iron and carbon are used, and the temperature and the time of the nitriding reaction are controlled to ensure the stable and uniform circulation of the nitrogen in the kiln of a furnace in order to make the product stably fired, so the ferrosilicon vanadium nitride product with an effective chemical ratio of V to N of 3.636:1 is obtained. Compared with existing methods using ferrosilicon, the method in the invention, using the silica powder as the silicon source, has the advantages of reduction of the cost of the raw materials, good economic benefits and good application prospect.

Description

Technical field[0001]The invention relates to the technical field of ferroalloys, in particular to a method for preparing silicon nitride ferro-vanadium.Background technique[0002]Silicon nitride ferro-vanadium is an important vanadium alloy additive. It contains composite alloys containing vanadium, iron, silicon, nitrogen and other elements, which are all necessary elements for steel production. They are closely combined with vanadium-containing structural steel and can form special alloy charge for vanadium-containing steel bars. Due to the low melting point and good compactness of silicon-vanadium-iron nitride, the melting speed in steel is fast, and the conditions outside the furnace can be quickly alloyed, which can effectively inhibit the formation of ferrite, austenite and coarse grains in the steel, which is similar to that of general vanadium. Compared with the alloy, the alloying time is shorter and the vanadium yield is higher.[0003]CN107604234A discloses a method for pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/16C22C1/10C22C35/00
CPCC22C1/10C22C29/16C22C35/00
Inventor 吴春亮李兰杰李九江董自慧张苏新李会林王国英陈华
Owner HEBEI IRON AND STEEL
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