CN110923557A - Preparation method of high-density nitrided ferrovanadium - Google Patents
Preparation method of high-density nitrided ferrovanadium Download PDFInfo
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- CN110923557A CN110923557A CN201911041657.1A CN201911041657A CN110923557A CN 110923557 A CN110923557 A CN 110923557A CN 201911041657 A CN201911041657 A CN 201911041657A CN 110923557 A CN110923557 A CN 110923557A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
- C22C1/053—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds
- C22C1/055—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds using carbon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/16—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on nitrides
Abstract
A preparation method of high-density nitrided ferrovanadium comprises the following steps: mixing the vanadium oxide, the carbonaceous reducing agent and the iron-containing raw material according to the mass percentage of 1: 0.24-0.29: 0.29-0.6, adding a binder into the prepared vanadium oxide, carbonaceous reducing agent and iron-containing raw material, and then putting the vanadium oxide, carbonaceous reducing agent, iron-containing raw material and binder into a mixing device for dry mixing to form a mixed raw material; pressing the mixed raw materials into raw material embryo blocks by dry pressing equipment; the method has the advantages that the raw material embryo blocks are loaded into nitriding equipment, and are sequentially subjected to pre-reduction and medium-temperature nitriding, the nitrided ferrovanadium prepared by the method provided by the invention can be directly packaged without being crushed, a double-channel pushed slab kiln is adopted, the production efficiency is effectively improved, and the method is low in costThe apparent density of the nitrided ferrovanadium obtained under the conditions of the temperature and the short nitriding time is close to 6.0g/cm3The contents of sulfur and phosphorus are far lower than that of vanadium iron nitride produced by a liquid nitriding method.
Description
Technical Field
The invention relates to the technical field of steel additive production, in particular to a preparation method of high-density nitrided ferrovanadium.
Background
The preparation method of the ferrovanadium nitride mainly comprises a liquid nitriding method and a solid nitriding method. A typical liquid nitriding process involves placing a qualified ferrovanadium melt, which has been smelted in an electric furnace, into a ladle with a bottom gas sweep, while introducing nitrogen gas for liquid nitriding. A typical solid nitriding method comprises the steps of introducing nitrogen into ferrovanadium with the vanadium content of 37-52% in a 600kW resistance furnace after ball milling under the vacuum degree of 40Pa, and nitriding at the temperature of about 1050 ℃ for about 17 hours. The invention patent with the patent number of CN10482518A discloses a method for preparing ferrovanadium nitride by using a vacuum furnace, which comprises the steps of mixing powder vanadium, graphite, polyvinyl alcohol and iron powder according to a certain proportion, pressing the mixture into a flat ball material, putting the flat ball material into the vacuum furnace for nitriding and sintering to prepare the ferrovanadium nitride, wherein the method needs to be carried out under the vacuum condition, and the prepared alloy has low nitrogen content. The invention patent with the patent number of CN105483507A discloses a nitrided ferrovanadium alloy and a preparation method thereof, and the method takes vanadium oxide, iron oxide or iron and a carbonaceous reducing agent as raw materials to prepare nitrided ferrovanadium through a high-temperature carbonization stage and a high-temperature nitridation stage in a high-temperature furnace. The method needs to be carried out in a high-temperature furnace, and the preparation temperature is high.
Disclosure of Invention
In view of the above, it is necessary to provide a method for preparing high-density nitrided ferrovanadium with low nitriding temperature, short nitriding time and high apparent density.
A preparation method of high-density nitrided ferrovanadium comprises the following steps:
the method comprises the following steps: mixing the materials according to the mass percentage of vanadium oxide to carbonaceous reducing agent to iron-containing raw material being 1 to (0.24-0.29) to (0.29-0.6), wherein the iron-containing raw material is one of reduced iron powder, ferric oxide and ferroferric oxide;
step two: adding a binder into the vanadium oxide, the carbonaceous reducing agent and the iron-containing raw material which are prepared in the step one, and then putting the vanadium oxide, the carbonaceous reducing agent, the iron-containing raw material and the binder into mixing equipment for dry mixing to form a mixed raw material;
step three: pressing the mixed raw materials into raw material embryo blocks by dry pressing equipment;
step four: loading the raw material embryo blocks into nitriding equipment, and sequentially carrying out pre-reduction and medium-temperature nitriding, wherein the pre-reduction temperature of the raw material embryo blocks is 600-900 ℃, the pre-reduction time of the raw material embryo blocks is 1-2 h, the medium-temperature nitriding temperature of the raw material embryo blocks is 1160-1380 ℃, and the medium-temperature nitriding time is 3-4 h;
step five: and cooling the nitrided raw material billet along with the furnace, and then discharging the raw material billet out of the furnace.
The nitrided ferrovanadium prepared by the method provided by the invention can be directly packaged without being crushed, the production efficiency is effectively improved by adopting a double-channel pushed slab kiln, and the apparent density of the obtained nitrided ferrovanadium is close to 6.0g/cm under the conditions of lower temperature and shorter nitriding time3The contents of sulfur and phosphorus are far lower than that of vanadium iron nitride produced by a liquid nitriding method.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will further describe the embodiments.
The embodiment of the invention provides a preparation method of high-density nitrided ferrovanadium, which comprises the following steps:
the method comprises the following steps: mixing the materials according to the mass percentage of vanadium oxide to carbonaceous reducing agent to iron-containing raw material being 1 to (0.24-0.29) to (0.29-0.6), wherein the iron-containing raw material is one of reduced iron powder, ferric oxide and ferroferric oxide;
step two: adding a binder into the vanadium oxide, the carbonaceous reducing agent and the iron-containing raw material which are prepared in the step one, and then putting the vanadium oxide, the carbonaceous reducing agent, the iron-containing raw material and the binder into mixing equipment for dry mixing to form a mixed raw material;
step three: pressing the mixed raw materials into raw material embryo blocks by dry pressing equipment;
step four: loading the raw material embryo blocks into nitriding equipment, and sequentially carrying out pre-reduction and medium-temperature nitriding, wherein the pre-reduction temperature of the raw material embryo blocks is 600-900 ℃, the pre-reduction time of the raw material embryo blocks is 1-2 h, the medium-temperature nitriding temperature of the raw material embryo blocks is 1160-1380 ℃, and the medium-temperature nitriding time is 3-4 h;
step five: and cooling the nitrided raw material billet along with the furnace, and then discharging the raw material billet out of the furnace.
The nitrided ferrovanadium is prepared by adopting a carbothermic reduction method, because of the existence of iron, the nitriding temperature is too high in the nitriding stage, the iron is molten, and the tiny holes or channels in the raw material billet are blocked by the molten iron, so that the nitriding process is blocked.
The nitrided ferrovanadium prepared by the method provided by the invention can be directly packaged without being crushed, the production efficiency is effectively improved by adopting a double-channel pushed slab kiln, and the apparent density of the obtained nitrided ferrovanadium is close to 6.0g/cm under the conditions of lower temperature and shorter nitriding time3The contents of sulfur and phosphorus are far lower than that of vanadium iron nitride produced by a liquid nitriding method.
Further, the granularity of the reduced iron powder is-80 meshes and 100 percent of the reduced iron powder passes through, and the granularity of the ferric oxide and the ferroferric oxide is-100 meshes and 100 percent of the reduced iron powder passes through.
Further, the carbonaceous reducing agent comprises one or more of carbon black, carburant and clean coal, and the particle size of the carbonaceous reducing agent is-150 meshes and 100 percent of the carbonaceous reducing agent passes through the carbonaceous reducing agent.
Further, graphite is added to the carbonaceous reducing agent.
In the embodiment, the carbonaceous reducing agent is added with graphite and is formed by a dry method, so that the problem that the existing forming equipment can be formed only by adding water is solved, and the problem that the formed raw material billet needs to be dried is omitted.
Further, one of urea and melamine is added to the carbonaceous reducing agent.
In the embodiment, a small amount of urea or melamine is added, so that a large amount of tiny holes or channels are prevented from being generated in the raw material embryo block during high-temperature sintering, and the density is improved.
In the method provided by the invention, vanadium oxide and carbonaceous reducing agent in the raw material embryo block are wrapped by urea or melamine, active nitrogen generated after the thermal decomposition of the urea and the melamine directly contacts and reacts with the vanadium oxide, and the part of nitrogen directly reacts and carries out nitridation reaction with the raw material embryo block without a long infiltration process, so that the nitridation of the raw material embryo block is greatly promoted, the nitridation time is reduced, and the nitridation temperature is also reduced.
In the method provided by the invention, melamine and urea are heated and decomposed to emit a large amount of active nitrogen, urea and melamine are used to decompose high-activity nitrogen to promote the nitridation of the raw material embryo block, the added urea and melamine are thermally decomposed to form micro holes or channels which are criss-cross and communicated with the outside in the raw material embryo block, the specific surface of the raw material embryo block is increased to promote the nitridation of the raw material embryo block, the outside nitrogen can quickly penetrate into the raw material embryo block through the micro holes or channels to promote the nitridation of the central part of the raw material embryo block, carbon monoxide gas generated in the raw material embryo block can also quickly disperse through the micro holes or channels, the nitridation of the raw material embryo block is promoted in two aspects, the problems that in the prior art, the raw material embryo block only has high nitrogen content near the surface part and the nitrogen content in the raw material embryo block is low are solved, the problem of low integral nitrogen content after the raw material embryo block is nitrided is caused.
In the method provided by the invention, as graphite is added and dry mixing is adopted, conditions are created for dry forming, as wet mixing or a precursor process is adopted, urea or melamine is dissolved in water, the urea and the melamine can reach molecular level uniformity in the raw material embryo block, only micro holes which are dispersedly distributed and not communicated can be formed in the raw material embryo block after the urea and the melamine are thermally decomposed, a micro gas channel communicated with the outside is difficult to form in the raw material embryo block, the permeation of outside nitrogen is not facilitated, the discharge of carbon monoxide in the inside is not facilitated, the nitridation reaction is hindered, the nitridation time is long, higher power is required for the permeation of nitrogen, the nitridation temperature is naturally high, a large number of cavities exist in the raw material embryo block, and the apparent density is low.
According to the method provided by the invention, the urea or the melamine and the vanadium oxide, the carbonaceous reducing agent and the iron-containing raw material are dry-mixed and then are pressed into the raw material billet by a dry method, the urea or the melamine cannot reach molecular level uniformity in the raw material billet, gas generated by decomposition of the urea or the melamine can only form criss-cross micro holes or channels which are mutually communicated with the outside, so that the permeation of the outside nitrogen is facilitated, and the diffusion of the gas generated in the raw material billet is also facilitated, so that the nitriding rate of the whole raw material billet is improved, the nitriding time is short, the nitriding temperature is low, the urea or the melamine does not need to be excessive, as long as the criss-cross micro holes or channels which are communicated with the inside and the outside can be formed, and the apparent density of the vanadium.
Further, the vanadium compound is one or a mixture of more of vanadium trioxide, vanadium pentoxide, ammonium metavanadate, ammonium polyvanadate and vanadium-nitrogen powder, and the particle size of the vanadium compound is-180 meshes and 100% of vanadium-nitrogen powder passes through the vanadium compound.
In this embodiment, the ammonia gas generated by the decomposition of the ammonium metavanadate also contributes to the nitriding of the nitrided ferrovanadium, so that the nitrogen infiltration time is reduced, the nitriding time is reduced, the nitrogen infiltration power is reduced, and the nitriding temperature is reduced.
Further, the binder is one of molasses, polyvinyl alcohol, starch and an organic binder, when the binder is molasses, the additive amount of the molasses is 7-10% of that of the iron-containing raw material, when the binder is polyvinyl alcohol, the additive amount of the polyvinyl alcohol is 10-12% of that of the iron-containing raw material, when the binder is starch, the additive amount of the starch is 9-11% of that of the iron-containing raw material, the binder is an organic binder, and the additive amount of the organic binder is 5-8% of that of the iron-containing raw material.
Further, the pressure of the dry pressing equipment is 30-60 MPa.
Further, the nitriding equipment is a double-channel pushed slab kiln, and the nitrogen flow in the double-channel pushed slab kiln is 1.0-3.5 m3And h, the pressure of nitrogen in the double-channel pushed slab kiln is 30-60 Pa.
Further, in the fifth step, the cooling time of the nitrided raw material billet is 4-5 hours.
In the above examples, the vanadium oxide/carbonaceous reducing agent/iron-containing raw material has a moderate average particle size, an excessively small particle size, an excessively dense raw material briquette, difficult nitridation, an excessively large particle size, a long time required for a single raw material particle nitrogen infiltration process, and a moderate particle size is favorable for raw material briquette nitridation.
The invention is further illustrated by the following examples and comparative examples, which are intended to illustrate the invention in detail and are not to be construed as limiting the scope of the invention in any way.
Example 1: mixing vanadium pentoxide and a mixture of graphite and carbon black, namely 1: 0.255: 0.51 in percentage by mass, adding a small amount of urea into the prepared vanadium pentoxide, the mixture of graphite and carbon black and reduced iron powder, adding an organic binder, wherein the addition amount of the organic binder is 5% of that of the reduced iron powder, then putting the vanadium pentoxide, the mixture of graphite and carbon black, the reduced iron powder and the organic binder into a mixing device together for dry mixing to form a mixed raw material, pressing the mixed raw material into a raw material billet through a dry pressing device, putting the raw material billet into a double-channel push plate kiln, wherein the nitrogen pressure in the double-channel push plate kiln is 30Pa, and the nitrogen flow in the double-channel push plate kiln is 2.0m3And h, sequentially carrying out pre-reduction and medium-temperature nitridation, wherein the pre-reduction temperature of the raw material billet is 660 ℃, the pre-reduction time of the raw material billet is 1h, the medium-temperature nitridation temperature of the raw material billet is 1300 ℃, the medium-temperature nitridation time is 3h, and the nitrided raw material billet is cooled for 4h along with the furnace and then taken out of the furnace.
Example 2: mixing according to the mass percentage of the mixture of vanadium pentoxide and ammonium metavanadate, the mixture of graphite and carbon black and the reduced iron powder being 1: 0.25: 0.35, wherein the mass percent of vanadium pentoxide and ammonium metavanadate is 1:0.6, the mixture of graphite and carbon black also contains a small amount of melamine, adding organic binder into the prepared mixture of vanadium pentoxide and ammonium metavanadate, the mixture of graphite and carbon black and reduced iron powder, the addition amount of the organic binder is 6% of that of the reduced iron powder, then the mixture of vanadium pentoxide, graphite and carbon black, the reduced iron powder and the organic binder are filled into a mixing device together and are dry-mixed to form mixed raw materials, the mixed raw materials are pressed into raw material billets through a dry pressing device, the raw material billets are filled into a double-channel pushed slab kiln, the nitrogen pressure in the double-channel pushed slab kiln is 30Pa, and the nitrogen flow in the double-channel pushed slab kiln is 2.1 m.3And/h, sequentially carrying out pre-reduction and medium-temperature nitridation, wherein the pre-reduction temperature of the raw material billet is 650 ℃, the pre-reduction time of the raw material billet is 1h, the medium-temperature nitridation temperature of the raw material billet is 1290 ℃, the medium-temperature nitridation time is 3h, and the nitrided raw material billet is cooled for 4h along with the furnace and then discharged from the furnace.
Example 3: mixing materials according to the mass percent of vanadium trioxide to carbon black to ferroferric oxide of 1 to 0.24 to 0.57, adding polyvinyl alcohol into the prepared vanadium trioxide, carbon black and ferroferric oxide, wherein the addition of the polyvinyl alcohol is 9 percent of the ferroferric oxide, then putting the vanadium trioxide, the carbon black, the ferroferric oxide and the polyvinyl alcohol into a mixing device together for dry mixing to form a mixed raw material, pressing the mixed raw material into a raw material billet through a dry pressing device, putting the raw material billet into a double-channel push plate kiln, wherein the nitrogen pressure in the double-channel push plate kiln is 30Pa, and the nitrogen flow in the double-channel push plate kiln is 2.2m3And/h, sequentially carrying out pre-reduction and medium-temperature nitridation, wherein the pre-reduction temperature of the raw material billet is 700 ℃, the pre-reduction time of the raw material billet is 1h, the medium-temperature nitridation temperature of the raw material billet is 1330 ℃, the medium-temperature nitridation time is 3h, and the nitrided raw material billet is cooled for 4h along with the furnace and then taken out of the furnace.
Example 4: mixing materials according to the mass percent of a mixture of vanadium trioxide and ammonium polyvanadate: carbon black: iron trioxide being 1: 0.24: 0.29, wherein the mass percent of vanadium trioxide and ammonium polyvanadate is 1:0.8, adding polyvinyl alcohol into the prepared mixture of vanadium pentoxide and ammonium metavanadate, carbon black and iron trioxide, wherein the addition of the polyvinyl alcohol is 9% of the iron trioxide, then putting the mixture of vanadium trioxide and ammonium polyvanadate, carbon black, iron trioxide and polyvinyl alcohol into a mixing device together to form a mixed raw material, pressing the mixed raw material into a raw material billet through a dry pressing device, putting the raw material billet into a double-channel push plate kiln, wherein the nitrogen pressure in the double-channel push plate kiln is 30Pa, and the nitrogen flow in the double-channel push plate kiln is 2.2m3And/h, sequentially carrying out pre-reduction and medium-temperature nitridation, wherein the pre-reduction temperature of the raw material billet is 730 ℃, the pre-reduction time of the raw material billet is 1h, the medium-temperature nitridation temperature of the raw material billet is 1350 ℃, the medium-temperature nitridation time is 3.3h, and the nitrided raw material billet is cooled for 4h along with the furnace and then discharged from the furnace.
Example 5: mixing the vanadium trioxide and the vanadium-nitrogen powder according to the mass percentage of a mixture of the vanadium trioxide and the vanadium-nitrogen powder, namely clean coal, ferroferric oxide of 1: 0.27: 0.54, wherein the mass percentage of the vanadium trioxide and the vanadium-nitrogen powder is 1:0.8, and mixing the prepared vanadium trioxide and the vanadium-nitrogen powderAdding starch into the mixture, the clean coal and the ferroferric oxide, wherein the addition amount of the starch is 9.5 percent of that of the ferroferric oxide, then putting the mixture of vanadium trioxide and vanadium-nitrogen powder, the clean coal, the ferroferric oxide and the starch into a mixing device together for dry mixing to form a mixed raw material, pressing the mixed raw material into a raw material billet through a dry pressing device, putting the raw material billet into a double-channel push plate kiln, wherein the nitrogen pressure in the double-channel push plate kiln is 30Pa, and the nitrogen flow in the double-channel push plate kiln is 2.2m3And/h, sequentially carrying out pre-reduction and medium-temperature nitridation, wherein the pre-reduction temperature of the raw material billet is 630 ℃, the pre-reduction time of the raw material billet is 1.5h, the medium-temperature nitridation temperature of the raw material billet is 1270 ℃, the medium-temperature nitridation time is 3h, and the nitrided raw material billet is cooled for 4h along with the furnace and then discharged from the furnace.
Example 6: mixing materials according to the mass percent of vanadium trioxide, carbon black and carburant to the mass percent of reduced iron powder of 1: 0.245: 0.56, wherein the mass percent of carbon black and carburant is 1:0.5, adding molasses to the prepared mixture of vanadium trioxide, carbon black and carburant and reduced iron powder, wherein the addition amount of the molasses is 7% of that of the reduced iron powder, then putting the mixture of vanadium trioxide, carbon black and carburant, the reduced iron powder and the molasses into a mixing device for dry mixing to form a mixed raw material, pressing the mixed raw material into a raw material billet through a dry pressing device, putting the raw material billet into a double-channel push plate kiln, wherein the nitrogen pressure in the double-channel push plate kiln is 30Pa, and the nitrogen flow in the double-channel push plate kiln is 2.5m3And h, sequentially carrying out pre-reduction and medium-temperature nitridation, wherein the pre-reduction temperature of the raw material billet is 800 ℃, the pre-reduction time of the raw material billet is 1.5h, the medium-temperature nitridation temperature of the raw material billet is 1360 ℃, the medium-temperature nitridation time is 3h, and the nitrided raw material billet is cooled for 4h along with the furnace and then discharged from the furnace.
The vanadium content, the carbon content, the nitrogen content and the apparent density of the ferrovanadium nitride produced in examples 1 to 6 were measured to obtain the following table:
| item | V% | N% | C% | Density g/cm3 |
| Example 1 | 45.2 | 12.4 | 0.9 | 5.2 |
| Example 2 | 55.2 | 11.8 | 0.94 | 5.1 |
| Example 3 | 39.0 | 10.21 | 0.45 | 5.8 |
| Example 4 | 56.1 | 10.11 | 0.38 | 5.9 |
| Example 5 | 44.2 | 10.66 | 0.95 | 5.1 |
| Example 6 | 40.6 | 10.39 | 0.64 | 5.3 |
As can be seen from the test results shown in the table above, firstly, compared with the existing carbothermic process, the examples provided by the method of the present invention all use a lower nitriding temperature and a shorter nitriding time, and generally have a higher apparent density, especially the examples 3 and 4, which have an apparent density close to 6.0g/cm3, according to the understanding of section 6.1 of section four in section two of patent examination manual 2010, even if the examples 3 and 4 of the present invention are accidentally made, the inventive property of the present invention cannot be denied; secondly, the nitrogen content of the urea is obviously improved in the embodiment 1 and the melamine in the embodiment 2, and the urea is added in the embodiment 1.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. The preparation method of the high-density nitrided ferrovanadium is characterized by comprising the following steps:
the method comprises the following steps: mixing the materials according to the mass percentage of vanadium oxide to carbonaceous reducing agent to iron-containing raw material being 1 to (0.24-0.29) to (0.29-0.6), wherein the iron-containing raw material is one of reduced iron powder, ferric oxide and ferroferric oxide;
step two: adding a binder into the vanadium oxide, the carbonaceous reducing agent and the iron-containing raw material which are prepared in the step one, and then putting the vanadium oxide, the carbonaceous reducing agent, the iron-containing raw material and the binder into mixing equipment for dry mixing to form a mixed raw material;
step three: pressing the mixed raw materials into raw material embryo blocks by dry pressing equipment;
step four: loading the raw material embryo blocks into nitriding equipment, and sequentially carrying out pre-reduction and medium-temperature nitriding, wherein the pre-reduction temperature of the raw material embryo blocks is 600-900 ℃, the pre-reduction time of the raw material embryo blocks is 1-2 h, the medium-temperature nitriding temperature of the raw material embryo blocks is 1160-1380 ℃, and the medium-temperature nitriding time is 3-4 h;
step five: and cooling the nitrided raw material billet along with the furnace, and then discharging the raw material billet out of the furnace.
2. The method for preparing high-density nitrided ferrovanadium as claimed in claim 1, wherein: the granularity of the reduced iron powder is-80 meshes and 100 percent of the reduced iron powder passes through the reduced iron powder, and the granularity of the ferric oxide and the ferroferric oxide passes through the reduced iron powder and 100 percent of the reduced iron powder.
3. The method for preparing high-density nitrided ferrovanadium as claimed in claim 1, wherein: the carbonaceous reducing agent comprises one or more of carbon black, carburant and cleaned coal, and the particle size of the carbonaceous reducing agent is-150 meshes and 100 percent of the carbonaceous reducing agent passes through the carbonaceous reducing agent.
4. The method for preparing high-density nitrided ferrovanadium as claimed in claim 3, wherein: graphite is added to the carbonaceous reducing agent.
5. The method for preparing high-density nitrided ferrovanadium according to claim 4, characterized in that: one of urea and melamine is also added into the carbonaceous reducing agent.
6. The method for preparing high-density nitrided ferrovanadium as claimed in claim 1, wherein: the vanadium compound is one or a mixture of vanadium trioxide, vanadium pentoxide, ammonium metavanadate, ammonium polyvanadate and vanadium-nitrogen powder, and the particle size of the vanadium compound is-180 meshes and 100% of vanadium-nitrogen powder passes through the vanadium compound.
7. The method for preparing high-density nitrided ferrovanadium as claimed in claim 1, wherein: the binding agent is molasses, polyvinyl alcohol, starch or an organic binding agent, when the binding agent is molasses, the addition amount of the molasses is 7-10% of that of the iron-containing raw material, when the binding agent is polyvinyl alcohol, the addition amount of the polyvinyl alcohol is 10-12% of that of the iron-containing raw material, when the binding agent is starch, the addition amount of the starch is 9-11% of that of the iron-containing raw material, the binding agent is an organic binding agent, and the addition amount of the organic binding agent is 5-8% of that of the iron-containing raw material.
8. The method for preparing high-density nitrided ferrovanadium as claimed in claim 1, wherein: the pressure of the dry pressing equipment is 30-60 MPa.
9. The method for preparing high-density nitrided ferrovanadium as claimed in claim 1, wherein: the nitriding equipment is a double-channel pushed slab kiln, and the nitrogen flow in the double-channel pushed slab kiln is 1.0-3.5 m3And h, the pressure of nitrogen in the double-channel pushed slab kiln is 30-60 Pa.
10. The method for preparing high-density nitrided ferrovanadium as claimed in claim 1, wherein: in the fifth step, the cooling time of the nitrided raw material billet is 4-5 h.
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