CN205907338U - System for preparation vanadium -nitrogen alloy - Google Patents
System for preparation vanadium -nitrogen alloy Download PDFInfo
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- CN205907338U CN205907338U CN201620831587.5U CN201620831587U CN205907338U CN 205907338 U CN205907338 U CN 205907338U CN 201620831587 U CN201620831587 U CN 201620831587U CN 205907338 U CN205907338 U CN 205907338U
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- nitrogen
- vanadium
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- rotary hearth
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- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 229910001199 N alloy Inorganic materials 0.000 title abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 119
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 26
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- QUEDYRXQWSDKKG-UHFFFAOYSA-M [O-2].[O-2].[V+5].[OH-] Chemical compound [O-2].[O-2].[V+5].[OH-] QUEDYRXQWSDKKG-UHFFFAOYSA-M 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 230000009467 reduction Effects 0.000 claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 15
- 229910000756 V alloy Inorganic materials 0.000 claims description 49
- 230000015572 biosynthetic process Effects 0.000 claims description 26
- 238000003786 synthesis reaction Methods 0.000 claims description 25
- 238000003763 carbonization Methods 0.000 claims description 24
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 16
- 239000000498 cooling water Substances 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 11
- 239000001301 oxygen Substances 0.000 abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 abstract description 11
- 239000012535 impurity Substances 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000006722 reduction reaction Methods 0.000 description 31
- 238000006243 chemical reaction Methods 0.000 description 24
- 238000000034 method Methods 0.000 description 20
- 239000008188 pellet Substances 0.000 description 11
- 238000005121 nitriding Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 229910000628 Ferrovanadium Inorganic materials 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 6
- 239000010439 graphite Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 5
- 229910052720 vanadium Inorganic materials 0.000 description 5
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 5
- 229910021541 Vanadium(III) oxide Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- -1 ferrovanadium nitride Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004484 Briquette Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- MVXMNHYVCLMLDD-UHFFFAOYSA-N 4-methoxynaphthalene-1-carbaldehyde Chemical compound C1=CC=C2C(OC)=CC=C(C=O)C2=C1 MVXMNHYVCLMLDD-UHFFFAOYSA-N 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001337 iron nitride Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011027 product recovery Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- IBYSTTGVDIFUAY-UHFFFAOYSA-N vanadium monoxide Chemical compound [V]=O IBYSTTGVDIFUAY-UHFFFAOYSA-N 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The utility model discloses a system for preparation vanadium -nitrogen alloy. This system includes: forming device, forming device has vanadium trioxide powder inlet, graphite powder inlet, ferriferrous oxide powder inlet and the export of mixtures lump, the rotary hearth furnace, the rotary hearth furnace sets gradually intake zone, carbide reduction district, the synthetic district of nitrogenize, cooling space and the ejection of compact along the raw materials travel direction and distinguishes, wherein, the intake zone has mixtures lump entry, mixtures lump entry with the export of mixtures lump links to each other, the carbide reduction district has the carbon monoxide export, the synthetic district of nitrogenize has the nitrogen gas entry, ejection of compact district has the vanadium -nitrogen alloy export. The vanadium nitrogen alloy that utilizes this department to control and obtain fully, the nitrogen content is high, the oxygen content is low, impurity is few. And, the simple structure of this system, easily operation.
Description
Technical Field
The utility model relates to a system for preparation nitrogen vanadium alloy.
Background
The ferrovanadium nitride is a novel vanadium-nitrogen alloy additive, has performance superior to that of ferrovanadium and vanadium nitride, and can be widely applied to products such as high-strength screw reinforcing steel bars, high-strength pipeline steel, high-strength section steel (H-shaped steel, I-shaped steel, channel steel and angle steel), sheet billet continuous casting and rolling high-strength steel belts, non-quenched and tempered steel, high-speed tool steel and the like. The specific gravity of the ferrovanadium nitride can reach 5.0g/cm3Compared with the addition of vanadium nitride (the specific gravity is about 3.5), the vanadium nitride alloy has higher absorption rate, the recovery rate of vanadium iron nitride can reach more than 95%, the average absorption rate is higher than that of vanadium-nitrogen alloy by 3-5%, the performance is more stable, and the vanadium nitride alloy has higher refined crystal grains, improved strength, toughness, ductility and the like.
The nitrogen increasing method in steel generally comprises the following steps: (1) adding nitrogen-rich ferromanganese; (2) adding calcium cyanamide; (3) nitrogen purging, but these methods all have disadvantages: method (1) is expensive; method (2) is low and unstable in yield; the method (3) requires a special apparatus for nitrogen blowing.
Thus, the system for preparing the nitrogen vanadium alloy needs to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a system for preparing nitrogen vanadium alloy, wherein, set up vanadium trioxide powder entry, graphite powder entry, ferroferric oxide powder entry on the forming device to vanadium trioxide is the raw materials, joins in graphite and ferroferric oxide, and wherein, the ferroferric oxide is as the catalyst of nitridation, promotes going on of nitridation. The method is characterized in that a carbonization-reduction area and a nitridation synthesis area are arranged in the rotary hearth furnace, so that raw materials are subjected to carbonization-reduction treatment and nitridation treatment step by step, nitrogen in the nitridation synthesis area is prevented from entering a carbonization reaction area, the CO concentration in the carbonization reaction area is increased, and the vanadium-nitrogen alloy with high nitrogen content, low oxygen content and few impurities is obtained.
According to an aspect of the utility model, the utility model provides a system for preparing nitrogen vanadium alloy. According to the utility model discloses an embodiment, this system includes: the molding device is provided with a vanadium trioxide powder inlet, a graphite powder inlet, a ferroferric oxide powder inlet and a mixed material block mass outlet; the rotary hearth furnace is sequentially provided with a feeding area, a carbonization-reduction area, a nitrification synthesis area, a cooling area and a discharging area along the moving direction of raw materials, wherein the feeding area is provided with a mixed material briquette inlet which is connected with a mixed material briquette outlet; the carbonization reduction zone has a carbon monoxide outlet; the nitrification synthesis zone has a nitrogen gas inlet; the discharge area is provided with a nitrogen vanadium alloy outlet.
According to the utility model discloses system of preparation nitrogen vanadium alloy, last vanadic oxide powder entry that sets up of forming device, graphite powder entry, the ferroferric oxide powder entry to vanadic oxide is the raw materials, join in graphite and ferroferric oxide, wherein, ferroferric oxide is as the catalyst of nitrogenize reaction, make the reactivity of material improve, the activation energy reduces, and simultaneously, the iron element in the ferroferric oxide can form ferrovanadium alloy and FeN with vanadium and nitrogen in the nitriding treatment in-process, make the nitrogen content in the nitrogen vanadium alloy show and improve. The carbonization-reduction zone and the nitridation synthesis zone are arranged in the rotary hearth furnace, so that raw materials are subjected to carbonization-reduction treatment and nitridation treatment step by step, nitrogen in the nitridation synthesis zone is prevented from entering the carbonization reaction zone, the CO concentration in the carbonization reaction zone is improved, the reducing atmosphere is enhanced, the carbonization treatment efficiency is higher, the raw material carbonization rate is obviously improved, the oxygen content in the pellets is effectively reduced, and further the vanadium-nitrogen alloy with high nitrogen content, low oxygen content and less impurities is obtained. Moreover, the system has simple structure and easy operation.
Optionally, the rotary hearth furnace further comprises: the first retaining wall is arranged between the carbonization and reduction area and the nitrification synthesis area; a second retaining wall disposed between the nitrification synthesis zone and the cooling zone; and the third retaining wall is arranged between the cooling zone and the discharging zone.
Optionally, the rotary hearth furnace further comprises: the first nitrogen through hole is arranged on the second baffle wall; and the second nitrogen through hole is arranged on the third baffle wall.
Optionally, the rotary hearth furnace further comprises: a waterwall disposed on a sidewall of the cooling zone.
Optionally, the rotary hearth furnace further comprises: and the heat accumulating type burner is arranged in the carbonization and reduction area and the nitrification synthesis area.
Optionally, the rotary hearth furnace further comprises: and the carbon monoxide conveying channel is respectively connected with the carbon monoxide outlet of the carbonization reduction zone and the air inlet of the heat accumulating type burner.
Optionally, the rotary hearth furnace further comprises: spiral discharger, spiral discharger sets up the ejection of compact district the nitrogen vanadium alloy exit, spiral discharger includes: a spiral shaft body; and the helical blade is spirally arranged on the helical shaft body.
Optionally, the screw discharger further comprises: the cooling water channel is arranged inside the spiral discharging device and is arranged along the axial direction of the spiral discharging device; and the nitrogen channel is arranged on the outer side of the cooling water channel, and is axially wrapped by the cooling water channel and provided with a nitrogen inlet and a nitrogen outlet.
Optionally, the nitrogen inlet is provided at an end of the spiral shaft body and the nitrogen outlet is provided on the spiral blade.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
figure 1 shows a schematic flow diagram of a method of making a nitrogen vanadium alloy according to one embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a system for preparing a nitrogen vanadium alloy according to an embodiment of the present invention;
FIG. 3 shows a schematic structural view of a rotary hearth furnace according to an embodiment of the present invention;
FIG. 4 shows a schematic structural view of a spiral discharger according to an embodiment of the present invention;
FIG. 5 shows a schematic structural view of a cross section of a spiral discharger according to an embodiment of the present invention;
fig. 6 shows a schematic view of a partial structure of a rotary hearth furnace according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Further, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
According to an aspect of the utility model, the utility model provides a system for preparing nitrogen vanadium alloy. Referring to fig. 2, according to an embodiment of the present invention, the system includes: a forming apparatus 100 and a rotary hearth furnace 200.
According to the utility model discloses an embodiment, forming device 100 has vanadium trioxide powder entry 101, graphite powder entry 102, ferroferric oxide powder entry 103 and mixture lump export 104, and forming device 100 is used for carrying out the shaping with vanadium trioxide powder and graphite powder and ferroferric oxide powder and handles, obtains the mixture lump. The ferroferric oxide is used as a catalyst of a nitriding reaction, so that the reaction activity of materials is improved, the activation energy is reduced, and meanwhile, in the nitriding treatment process, iron elements in the ferroferric oxide can form a ferrovanadium alloy and FeN with vanadium and nitrogen, so that the nitrogen content in the ferronitrogen alloy is obviously improved.
Referring to fig. 3, according to the embodiment of the present invention, the rotary hearth furnace 200 sets the feeding area 210, the carbonization-reduction area 220, the nitrogen synthesis area 230, the cooling area 240, and the discharging area 250 in sequence along the direction of the raw material movement, wherein the feeding area 210 has the mixed material lump inlet 201, the mixed material lump inlet 201 is connected with the mixed material lump outlet 104, the mixed material lump enters the rotary hearth furnace from the mixed material lump inlet 201 of the feeding area 210, the carbonization-reduction area 220 has the carbon monoxide outlet 203, the vanadium trioxide in the mixed material lump and graphite carry out the reduction reaction at high temperature, the vanadium trioxide is firstly reduced into vanadium monoxide, then vanadium carbide is generated, and carbon monoxide is discharged from the carbon monoxide outlet 203; the nitriding synthesis area 230 is provided with a nitrogen inlet 202, and vanadium carbide is subjected to nitriding treatment under a nitrogen environment and a high-temperature condition to generate a vanadium-nitrogen alloy; the discharging area 150 is provided with a nitrogen vanadium alloy outlet 204, and the nitrogen vanadium alloy is discharged from the nitrogen vanadium alloy outlet 204.
According to the embodiment of the utility model, the temperature of the rotary hearth furnace for carrying out the carbonization-reduction treatment is 1180-1250 ℃, and the time is 0.5-1 hour. Therefore, the carbonization-reduction efficiency is high, the effect is good, and vanadium trioxide is fully vanadium carbide.
According to the embodiment of the present invention, the temperature of the nitriding treatment in the rotary hearth furnace is 1250-1380 ℃, the time is 1-1.5 hours, and the ratio of the nitrogen partial pressure to the oxygen partial pressure is not lower than 33. From this, the efficient of nitridation to be favorable to the carborundum fully to nitrify, and the ratio of nitrogen partial pressure and oxygen partial pressure is not less than 33, make the nitrogen vanadium alloy of formation handle under the environment of high nitrogen content, avoid nitrogen vanadium alloy to be oxidized in the cooling process effectively, make the purity of nitrogen vanadium alloy higher.
According to some embodiments of the present invention, the rotary hearth furnace 200 further comprises: a first retaining wall 260, a second retaining wall 270, and a third retaining wall 280, wherein the first retaining wall 260 is disposed between the carbide reduction zone 220 and the nitride synthesis zone 230; the second barrier 270 is disposed between the nitride synthesis region 230 and the cooling region 240; a third dam 280 is disposed between the cooling zone 240 and the discharge zone 250. Therefore, the retaining wall is utilized to effectively separate the carbonization reduction zone, the nitridation synthesis zone and the cooling zone, and mutual influence among the zones is avoided.
According to the embodiment of the present invention, the rotary hearth furnace 200 further comprises: first nitrogen gas through-hole 205 and second nitrogen gas through-hole 206, wherein, first nitrogen gas through-hole 205 sets up on second barricade 270 for nitrogen gas is carried in the nitrogenization synthesis district, and second nitrogen gas through-hole 206 sets up on third barricade 280 for discharge nitrogen gas to the ejection of compact district, avoid the nitrogen vanadium alloy to be oxidized in ejection of compact process. The first nitrogen gas through hole 205 and the second nitrogen gas through hole 206 may be one or more according to the amount of nitrogen gas required for actual production.
Referring to fig. 6, according to some embodiments of the present invention, the rotary hearth furnace 200 further includes: and a second nitrogen gas inlet 205, the second nitrogen gas inlet 205 being provided on the entire top wall of the rotary hearth furnace, for supplying sufficient nitrogen gas to the rotary hearth furnace so that the reaction space of the rotary hearth furnace is in a nitrogen atmosphere.
According to the utility model discloses an embodiment, this rotary hearth furnace further includes: and the water cooling wall is arranged on the side wall of the cooling area. From this, carry out cooling treatment to the nitrogen vanadium alloy who generates fast through the water-cooling wall, the cooling effect is good, and is fast.
According to the utility model discloses an embodiment, this rotary hearth furnace further includes: and the heat accumulating type burner is arranged in the carbonization-reduction area and the nitridation synthesis area, is used for heating the carbonization-reduction area and the nitridation synthesis area, and provides a high-temperature environment for carbonization-reduction treatment and nitridation treatment.
According to the utility model discloses an embodiment, this system further includes: and the carbon monoxide conveying channel is respectively connected with a carbon monoxide outlet of the carbonization reduction zone and an air inlet of the heat accumulating type burner, and is used for conveying the carbon monoxide generated by the carbonization reduction reaction to the heat accumulating type burner as a fuel of the heat accumulating type burner, so that comprehensive high-efficiency utilization of energy is realized, the production cost is lower, and the pollution of the carbon monoxide to the environment is also avoided.
According to the utility model discloses an embodiment, this rotary hearth furnace further includes: a spiral discharger 290 disposed at the nitrogen vanadium alloy outlet of the discharge zone, as shown in fig. 4, the spiral discharger 290 comprising: a spiral shaft body 291 and a spiral blade 292, the spiral blade 292 is spirally arranged on the spiral shaft body 291, and the spiral discharger 290 is used for discharging the product.
Referring to fig. 5, according to an embodiment of the present invention, the spiral discharger further includes: a cooling water passage 293 and a nitrogen gas passage 294, wherein the cooling water passage 293 is disposed inside the spiral discharger 290 and is disposed along an axial direction of the spiral discharger; and a nitrogen gas channel 294 is provided outside the cooling water channel 293, and the nitrogen gas channel 294 axially surrounds the cooling water channel 293, the nitrogen gas channel 294 having a nitrogen gas inlet 296 and a nitrogen gas outlet 295. The produced nitrogen vanadium alloy is subjected to water cooling and air cooling through the cooling water channel 293 and the nitrogen channel 294, so that the rapid cooling of the nitrogen vanadium alloy is facilitated. According to some embodiments of the utility model, the nitrogen gas of nitrogen gas passageway can be provided by the nitrogen gas that cooling zone 240 came, and nitrogen gas forms protective atmosphere in ejection of compact district 250 simultaneously, prevents that the nitrogen vanadium alloy from oxidizing once more to can cool off the pelletizing to below 200 ℃.
Referring to fig. 4 and 5, according to the embodiment of the present invention, the nitrogen inlet is disposed at the end of the spiral shaft body 291, i.e. it can be disposed at one end of the spiral shaft body 291, and also disposed at both ends of the spiral shaft body 291, thereby making the circulation path of the spiral shaft body of nitrogen longer, and more effectively cooling the nitrogen vanadium alloy.
According to some embodiments of the present invention, the nitrogen outlet is provided on the helical blade 292. Thereby make the nitrogen vanadium alloy also cool down through the in-process that the spiral discharger was discharged, the in-process that contacts with the blade, make the cooling effect of nitrogen vanadium alloy better.
In order to facilitate understanding of the aforementioned system for preparing a nitrogen vanadium alloy, a method for preparing a nitrogen vanadium alloy using the aforementioned system is provided herein. Referring to fig. 1, a method for preparing a nitrogen vanadium alloy is explained according to an embodiment of the present invention, the method comprising:
s100 Molding Process
According to the utility model discloses an embodiment, carry vanadium trioxide powder and graphite powder and ferroferric oxide powder through vanadium trioxide powder entry, graphite powder entry and ferroferric oxide powder entry and get into forming device and carry out the shaping processing, obtain the mixed material block mass. The ferroferric oxide is used as a catalyst of a nitriding reaction, so that the reaction activity of materials is improved, the activation energy is reduced, and meanwhile, in the nitriding treatment process, iron elements in the ferroferric oxide can form a ferrovanadium alloy and FeN with vanadium and nitrogen, so that the nitrogen content in the ferronitrogen alloy is obviously improved.
According to some embodiments of the present invention, vanadium trioxide powder and graphite powder and ferroferric oxide powder are mixed according to the mass ratio of 100: (48-52): (1-3) carrying out the molding treatment. Therefore, the graphite has high reduction efficiency and high reduction rate of vanadium trioxide, effectively avoids a large amount of raw materials from remaining, and is favorable for reducing the impurity content of the nitrogen-vanadium alloy. If the proportion of graphite powder is too high, easily lead to the carbon content in the final product vanadium nitride alloy high, influence vanadium nitride alloy's quality, if the proportion of graphite powder is too low, the carbonization reaction can not thoroughly react, and the product recovery rate is low. And the ferroferric oxide is used as a catalyst, so that the catalytic effect cannot be correspondingly improved by adding too much catalyst, but the cost is increased.
According to the utility model discloses a specific embodiment, the purity of vanadium trioxide powder is not less than 98%. Therefore, the vanadium trioxide powder has high purity and few impurities, and is beneficial to reducing the impurity content of the vanadium-nitrogen alloy and improving the yield of the nitrogen-vanadium alloy.
According to some embodiments of the utility model, vanadium trioxide powder and graphite powder's granularity is all not more than 200 meshes, and the average particle size of ferroferric oxide powder is not more than 20 microns. The inventor has found through a great deal of research that when the average particle size of the reaction raw materials is small, the specific surface area of the raw materials is high, the contact area of the two raw materials is large, the mass transfer efficiency and the heat transfer efficiency of the raw materials are high, and the reaction rate is high. When the raw materials are in the particle size range, the reaction activity of the raw materials is high, the reaction temperature is low, and the reaction time is short.
S200 reduction nitridation treatment
According to the embodiment of the utility model, the mixed material block mass is conveyed to the feeding area of the rotary hearth furnace for distributing, and the mixed material block mass is discharged from the discharging area after sequentially passing through the carbonization-reduction area, the nitridation synthesis area and the cooling area, wherein the mixed material block mass enters the carbonization-reduction area for carbonization-reduction treatment to obtain vanadium carbide and carbon monoxide; allowing vanadium carbide to enter a nitriding synthesis area and carrying out nitriding treatment on the vanadium carbide and nitrogen to obtain a vanadium-nitrogen alloy; and the nitrogen vanadium alloy enters a cooling zone for cooling treatment to obtain the cooled nitrogen vanadium alloy. And carrying out carbonization-reduction treatment and nitridation treatment in a rotary hearth furnace in a stepwise manner to obtain the vanadium-nitrogen alloy with high nitrogen content and low impurity content. The carbonization-reduction treatment and the nitridation treatment are carried out separately, nitrogen in a nitridation synthesis area is prevented from entering a carbonization reaction area, so that the CO concentration in the carbonization reaction area is improved, the reducing atmosphere is enhanced, the carbonization reaction efficiency is higher, the raw material carbonization rate is obviously improved, the oxygen content in the pellets is effectively reduced, and then the vanadium-nitrogen alloy with high nitrogen content, low oxygen content and less impurities is obtained. According to the embodiment of the present invention, the temperature of the carbonization-reduction treatment is 1180-1250 ℃ for 0.5-1 hour. Therefore, the carbonization-reduction efficiency is high, the effect is good, and the vanadium trioxide is ensured to be fully nitrided to generate vanadium carbide.
According to the embodiment of the present invention, the temperature of the nitridation treatment is 1250-. From this, the efficient of nitridation to be favorable to the carborundum fully to nitrify, and the ratio of nitrogen partial pressure and oxygen partial pressure is not less than 33, make the nitrogen vanadium alloy of formation handle under the environment of high nitrogen content, avoid nitrogen vanadium alloy to be oxidized in the cooling process effectively, make the purity of nitrogen vanadium alloy higher.
The present invention will now be described with reference to specific examples, which are intended to be illustrative only and are not to be construed as limiting the invention.
Example 1
Utilize the utility model discloses a system preparation nitrogen vanadium alloy, the concrete method is as follows:
(1) will V2O3Graphite powder and Fe3O4And water according to a mass ratio of 100: 48: 1: 8, mixing materials and pressing the pellets to obtain the pellets.
(2) And drying the pellets to obtain dried pellets.
(3) And (2) distributing the dried pellets into a rotary hearth furnace, setting the temperature of a carbonization reaction zone of the rotary hearth furnace to 1200 ℃, setting the reaction time to 0.8h, setting the temperature of a nitridation reaction zone to 1300 ℃, setting the nitridation reaction time to 1.5 h, after the nitridation reaction is finished, cooling the vanadium-nitrogen alloy in a cooling zone and a discharging zone to below 200 ℃ and discharging the vanadium-nitrogen alloy out of the furnace to obtain the vanadium-nitrogen alloy, wherein the vanadium-nitrogen alloy has the N content of 14%, the V content of 73% and the O content of only 1.5%, the nitrogen and vanadium content of the vanadium-nitrogen alloy is high, the oxygen content is low and the quality is excellent.
Example 2
Utilize the utility model discloses a system preparation nitrogen vanadium alloy, the concrete method is as follows:
(1) will V2O3Graphite powder and additive Fe3O4And water according to a mass ratio of 100: 52: 3: 10, mixing and pelletizing to obtain the pellets.
(2) And drying the pellets to obtain dried pellets.
(3) And (2) distributing the dried pellets into a rotary hearth furnace, setting the temperature of a carbonization reaction zone of the rotary hearth furnace to 1250 ℃, setting the reaction time to 1h, setting the temperature of a nitridation reaction zone to 1350 ℃, setting the nitridation reaction time to 2 h, finishing the nitridation reaction, cooling the vanadium-nitrogen alloy into a cooling zone and a discharging zone to below 200 ℃, and discharging to obtain the vanadium-nitrogen alloy, wherein the N content of the vanadium-nitrogen alloy is 15.5%, the V content is 76%, the O content is only 1%, the nitrogen and vanadium content of the vanadium-nitrogen alloy are high, the oxygen content is low, and the quality is excellent.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A system for preparing a nitrogen vanadium alloy, comprising:
the molding device is provided with a vanadium trioxide powder inlet, a graphite powder inlet, a ferroferric oxide powder inlet and a mixed material block mass outlet;
a rotary hearth furnace, wherein the rotary hearth furnace is sequentially provided with a feeding area, a carbonization-reduction area, a nitrification-synthesis area, a cooling area and a discharging area along the moving direction of raw materials,
wherein,
the feeding area is provided with a mixed material block mass inlet which is connected with the mixed material block mass outlet;
the carbonization reduction zone has a carbon monoxide outlet;
the nitrification synthesis zone has a nitrogen gas inlet;
the discharge area is provided with a nitrogen vanadium alloy outlet.
2. The system for preparing the nitrogen vanadium alloy according to the claim 1, wherein the rotary hearth furnace further comprises:
the first retaining wall is arranged between the carbonization and reduction area and the nitrification synthesis area;
a second retaining wall disposed between the nitrification synthesis zone and the cooling zone;
and the third retaining wall is arranged between the cooling zone and the discharging zone.
3. The system for preparing the nitrogen vanadium alloy according to the claim 2, characterized in that the rotary hearth furnace further comprises:
the first nitrogen through hole is arranged on the second baffle wall;
and the second nitrogen through hole is arranged on the third baffle wall.
4. The system for preparing the nitrogen vanadium alloy according to the claim 1, wherein the rotary hearth furnace further comprises:
a waterwall disposed on a sidewall of the cooling zone.
5. The system for preparing the nitrogen vanadium alloy according to the claim 1, wherein the rotary hearth furnace further comprises:
and the heat accumulating type burner is arranged in the carbonization and reduction area and the nitrification synthesis area.
6. The system for preparing the nitrogen vanadium alloy according to the claim 5, wherein the rotary hearth furnace further comprises:
and the carbon monoxide conveying channel is respectively connected with the carbon monoxide outlet of the carbonization reduction zone and the air inlet of the heat accumulating type burner.
7. The system for preparing the nitrogen vanadium alloy according to the claim 1, wherein the rotary hearth furnace further comprises:
spiral discharger, spiral discharger sets up the ejection of compact district the nitrogen vanadium alloy exit, spiral discharger includes:
a spiral shaft body; and
the helical blade is spirally arranged on the helical shaft body.
8. The system for preparing a nitrogen vanadium alloy according to claim 7, wherein the screw discharger further comprises:
the cooling water channel is arranged inside the spiral discharging device and is arranged along the axial direction of the spiral discharging device; and
and the nitrogen channel is arranged on the outer side of the cooling water channel, axially wraps the cooling water channel and is provided with a nitrogen inlet and a nitrogen outlet.
9. The system for preparing nitv alloy of claim 8, wherein the nitrogen inlet is arranged at the end of the spiral shaft body, and the nitrogen outlet is arranged on the spiral blade.
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| CN201620831587.5U CN205907338U (en) | 2016-08-01 | 2016-08-01 | System for preparation vanadium -nitrogen alloy |
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