CN101845566A - Method for continuous reduction production of VN alloy - Google Patents
Method for continuous reduction production of VN alloy Download PDFInfo
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- CN101845566A CN101845566A CN201010100293A CN201010100293A CN101845566A CN 101845566 A CN101845566 A CN 101845566A CN 201010100293 A CN201010100293 A CN 201010100293A CN 201010100293 A CN201010100293 A CN 201010100293A CN 101845566 A CN101845566 A CN 101845566A
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Abstract
The invention relates to a method for continuous reduction production of VN alloy, which comprises the following steps: raising the vertical high-temperature reduction nitrogenization temperature to 1550 to 1650 DEG C through a silicon molybdenum rod heating element; using an external hydraulic device for sequentially pushing crucibles with carbon- containing V2O5 pellets into a graphite carbon brick furnace hearth of an electric heating pushed slab kiln at a pushing speed rate of one crucible length per 10 to 15 minutes; completing the reduction and nitrogenization reaction by the carbon- containing V2O5 pellets in the vertical high-temperature reduction nitrogenization section; carrying out natural cooling in the vertical natural cooling section; preheating nitrogen gas in the vertical nitrogen gas preheating section; then, carrying out cooling in the vertical cooling water cooling section; and finally generating VN alloy products. The invention can fast, efficiently and continuously produce the VN alloy, can obviously improve the VN alloy yield of the unit furnace hearth length, can avoid the re-oxidization of the VN alloy in the cooling region, and has the advantages of high production efficiency, stable product quality and low cost.
Description
Technical field
The invention belongs to the preparation method of the additive in ferrous metallurgy field, particularly relate to the method and the production unit of a kind of (high temperature is quick) continuous reduction production of VN alloy.
Background technology
VN alloy is the good additive of steel-making, can be used for the additive in structure iron, tool steel, pipe line steel, reinforcing bar, common engineering steel and the cast iron preparation, can significantly improve the comprehensive mechanical performances such as wear resistance, rotproofness, toughness, intensity, hardness, ductility and thermal fatigue resistance of steel, and make steel have good weldability energy, and play effects such as eliminating the inclusion extension.The VN alloy technology has made full use of cheap nitrogen element, and the increase of nitrogen content has reduced grow up trend with alligatoring of precipitated phase in the vanadium steel, and the precipitated phase particle attenuates, more give full play to the effect of vanadium.Especially in Aldecor, add VN alloy and have more effective precipitation strength and Grain Refinement Effect than adding vanadium iron, in Aldecor, can save simultaneously the vanadium of 20wt%～40wt%, thereby reduce the STEELMAKING PRODUCTION cost, have good using value.For this reason, the Ministry of Science and Technology, the Ministry of Construction dispatch a joint document, clear, and from calendar year 2001, the production of domestic all high-quality steel must be added VN alloy.
At present, in the existing technology of preparation VN alloy, do not mention the method for relevant (high temperature is quick) continuous reduction production of VN alloy.1985, US Patent No. 4562057 was with the high oxide V of vanadium
2O
5Or ammonium vanadate is raw material and take mist (nitrogen+ammonia) as reducing agent and nitridizing agent, 675～700 ℃ of lower prereduction 1h in stove of elder generation, low melting point high price barium oxide is reduced to dystectic Low Valent Vanadium oxide, under 950 ℃, reduce simultaneously afterwards and nitriding 3～4h, thereafter product also will be used carbothermic method again, about 1400 ℃, remove a large amount of oxygen, make carbon vanadium nitride product; This process preparation process is many and discontinuous, is difficult to be applied in the industrial production.
The thick grade of the Wang Gong of University of Science ﹠ Technology, Beijing people in 1988 has proposed the preparation method of vanadium nitride in " laboratory research of vanadium carbide, carbon vanadium nitride manufacturing condition ", namely use V
2O
5With the active carbon compound stalk forming, under experiment condition, carry out carbon thermal reduction, reduction generates VC earlier under 1673K and 1.333Pa vacuum, pass into subsequently nitrogen, nitriding is 1.5 hours under 101325Pa, can obtain 72.99～81.22wt%V, 4.54～6.65wt%C, 9.069wt～9.577wt%N, the sample of 1.701～1.956wt%O.In order to improve the intensity of vanadium nitride, in raw material, add the 3wt% iron powder; This process need vacuum system, facility investment height, complicated operation.
2008, people such as Liu Xiansong are in application number is 200810022372.9 " a kind of production method of high-density vanadium-nitrogen alloy ", employing is external-heating rotary kiln under nitrogen atmosphere, under nitrogen protection, rotary kiln is burnt below 1000 ℃ in advance, collect the bulk product that under nitrogen protection, is cooled to the pre-burning of room temperature at the external-heating rotary kiln discharge port; Push then in the improved soft magnetism nitrogen atmosphere stove, be heated to 1000～1500 ℃ of temperature, material generation carbonization and nitrogenizing reaction, the back of coming out of the stove obtains vanadium-nitrogen alloy product.
2008, the people such as Liu Qiusheng were at " V
2O
5Burn till VN alloy process equipment research " in vanadic anhydride is sintered into VN alloy process equipment study; propose reduction process and divide three grades to carry out; the one-level reduction temperature is 670 ℃, and the second-stage reduction temperature is 1250 ℃, and three grades of nitriding temperatures are 1450 ℃; These process carbonizations and nitridation reaction temperature are 670 ℃～1500 ℃, and reaction speed is slow, yield poorly, and are not suitable for carrying out industrial production in enormous quantities.
Summary of the invention
The object of the invention is to provide a kind of method at the quick continuous reduction production of VN alloy of industrial high temperature, by the control temperature, makes carbon containing V
2O
5Pelletizing generation autoreduction is finished rapidly reduction and nitridation process, thereby significantly improves the output of same production line length vanadium-nitrogen alloy product; Simultaneously after reaching uniform temperature, through the high temperature fast restore, VN alloy is anti-to be reoxidized ability and greatly strengthens, when entering a small amount of air in the production equipment pushed bat kiln burner hearth, be reoxidized hardly, thereby solved pushed bat kiln long, the interior poorly sealed oxidized difficult problem in VN alloy surface that causes of burner hearth service time in the production; And provided at a certain temperature, for realizing anticipation reaction speed, output, carbon containing V
2O
5Pelletizing optimal volume and thickness of feed layer.
Technical scheme of the present invention is as follows:
The method of continuous reduction production of VN alloy provided by the invention, it adopts the electrically heated pushed bat kiln to carry out the also original production continuously of VN alloy, and described electrically heated pushed bat kiln comprises:
Longitudinal feeding section I;
Be positioned at longitudinal feeding section I vertical reduction nitridation section afterwards;
Be positioned at vertical reduction nitridation section naturally cooling section III afterwards;
Be positioned at the vertical cooling water-cooled section V behind the nature cooling section III;
It is characterized in that: also comprise: at vertical naturally cooling section III with vertically cool off vertical nitrogen preheating section IV between the water-cooled section V; With
Evenly be installed on the Si-Mo rod heating unit 2 in described vertical high temperature reduction nitrogenize section II from front to back, described Si-Mo rod heating unit Si-Mo rod 2 vertical insertions in the heating unit chamber that forms between graphite carbon tile stove thorax 5 and the high-alumina refractory brick layer 10, and graphite carbon tile stove thorax 5 is bonded to the burner hearth integral body of sealing by carbonaceous mud;
Described vertical reduction nitridation section is vertical high temperature reduction nitrogenize section II, and its temperature is 1550～1650 ℃.
The step of described continuous reduction production of VN alloy is as follows:
By Si-Mo rod heating element heater 2 temperature of described vertical high temperature reduction nitrogenize section II is risen to 1550～1650 ℃, use external hydraulic means that carbon containing V will be housed
2O
5The crucible 4 of pelletizing advanced the propelling speed of a crucible length to push successively in the graphitic carbon tile stove thorax 5 of electrical heating pushed bat kiln with per 10～15 minutes; Leave nitrogen flow channel 1 between described crucible 4 and the graphitic carbon tile stove thorax 5; Carbon containing V is housed
2O
5The crucible 4 of pelletizing passes through longitudinal feeding section I, vertical high temperature reduction nitrogenize section II, vertical natural cooling section III, vertical nitrogen preheating section IV and vertical water quench section V successively under the promotion of external hydraulic means; In its process, carbon containing V
2O
5Pelletizing is finished reduction and nitridation reaction at high temperature reduction nitrogenize section II successively, carry out the nature cooling at vertical natural cooling section III, to carry out preheating by the nitrogen that nitrogen flow channel 1 flows at nitrogen preheating section IV, carry out water quench at vertical water quench section V again, finally generate vanadium-nitrogen alloy product.
Described carbon containing V
2O
5The pelletizing width is 25～45mm, highly is 15～30mm, carbon containing V
2O
5The pelletizing feed layer thickness is 60～90mm.
Described electrically heated pushed bat kiln burner hearth is of a size of 24.5m * 700mm * 264mm; The crucible that described crucible 4 is made for the graphite carbon piece.
The longitudinal feeding section I length of described pushed bat kiln is 1.1m, and width is 1.5m; Described vertical high temperature reduction nitrogenize section II length is 12.5m, and width is 1.5m; Described vertical naturally cooling section III length is 1.2m, and width is 1.7m; Described vertical nitrogen preheating section IV length is 6.9m, and width is 1.5m; Described vertical cooling water-cooled section V length is 2.8m, and width is 1.2m.
The method of continuous reduction production of VN alloy of the present invention, because the vertical high temperature reduction nitrogenize section II that vertically exports between the cooling section import from feed zone of pushed bat kiln is evenly arranged Si-Mo rod heating element heater 2, this whole section is high temperature fast restore nitrogenize district, and this high temperature section length (being generally 12.5m) accounts for about 50% of total pushed bat kiln length; Keep equal-wattage during 2 work of Si-Mo rod heating element heater, so that the high temperature section temperature is 1550～1650 ℃, carbon containing V
2O
5Pelletizing just begins rapid intensification from entering burner hearth, directly enters the high temperature fast restore, through the high-temperature region of 12.5m, V
2O
5Inner quick autoreduction and the rapid nitridation of taking place of pelletizing, thus realize that quick, high yield prepares VN alloy.
Because carbon containing V
2O
5Gu the reduction of pelletizing and nitrogenize are the gas-strong endothermic reactions that at high temperature carries out, that is to say under the reaction temperature of fierceness, must supply with the sufficient heat that reacts required of finishing.Find after deliberation carbon containing V
2O
5Pelletizing need not the external world any reducing condition is provided again at a certain temperature, and pelletizing just can reach the degree of metalization near 100%, and similar one of its internal-response does not have softening, " miniature blast furnace " melting process; Because the V in the pelletizing
2O
5Powder and graphite powder granularity are all thinner, and the mixing uniformity height is so its local dynamic conditions is all more more advantageous than other direct-reduction technology.According to experimental study, V
2O
5Reduction of Pellet Containing Coal Char is V
2O
4The autoreduction temperature must be higher than 670 ℃, and VC generates the reaction temperature of VN and must be higher than 1450 ℃, V
2O
4Be reduced to VO, VO is reduced to V
2The temperature of the intermediate reactions such as C is between 670～1450 ℃, and along with the reduction of CO dividing potential drop, initial reaction temperature can decrease simultaneously.Carbon containing V
2O
5Pelletizing high temperature fast restore becomes the reducing atmosphere of metallized pellet mainly to rely on carbonaceous pelletizing self also originally to keep.By to carbon containing V
2O
5The laboratory research of pelletizing high temperature fast restore draws following several respects research conclusion, and is applied in the electrical heating pushed bat kiln production VN alloy of the present invention.
1, temperature has material impact to the reducing degree of VN alloy and nitridation and productive rate; Wherein, temperature is the most remarkable to the impact of reduction; Although mixed carbon comtent and recovery time have all reached carbon containing V
2O
5The operation requirements of pelletizing reduction, but temperature when low productive rate very low; According to carbonaceous pelletizing high temperature fast restore theory, improve temperature, autoreduction speed is obviously accelerated, in the time of more than 1450 ℃, need not the external world any reducing condition is provided again, pelletizing just can reach the degree of metalization near 100%, autoreduction is finished rapidly in its inside, this moment, yied of redution and reaction temperature had proportional relation, even in the middle of the relatively higher blanket of nitrogen of oxidizability, and carbon containing V
2O
5Pelletizing also can be well restored.In the present invention, carbon containing V
2O
5The temperature of pelletizing in described vertical high temperature reduction nitrogenize section II is when being elevated to 1550 ℃ and 1650 ℃ from 1450 ℃, reaction time shortens to 5.4h and 3h from 9h, thereby has significantly reduced the VN alloy production time and improved the VN alloy output of unit burner hearth length; If in other words speed of production, output kept identical with former, the required effective heated length of new production line can shorten greatly, can reduce burner hearth material, insulation material, electrical heating elements and power consumption, thereby reduce significantly the floor space of production cost and production line.
2, the high-temperature zone temperature of warm fast restore reoxidizes ability and has a direct impact vanadium-nitrogen alloy product is anti-.Aborning, in, the burner hearth long when poorly sealed when pushed bat kiln duration of service, have little air inevitably and enter the pushed bat kiln burner hearth, be exactly that this part a spot of air makes VN alloy reoxidize in naturally cooling section and cooling water-cooled section, can cause kiln discharge VN alloy upper surface afterwards that significantly oxidized vestige is arranged.Though oxidized product all only accounts for the minimum part of kiln discharge VN alloy total amount from the surface thickness to the massfraction, influence the result of use of VN alloy hardly as steel-making additive, but be exactly the oxidized sub-fraction in this surface, but greatly reduce the appearance effect of product, easily from intuitively giving a kind of product of people not by abundant reductive impression; Usually adopt in the production scene oxidized VN alloy taken out and send into again that intake zone reduces, nitrogenize, even the product surface of kiln discharge is oxidized more so again, following pelletizing can satisfy surface requirements; Yet the cost of this way is exactly the output of having wasted the energy, having reduced production line.And along with the pushed bat kiln prolongation of duration of service, the oxidized quantity of VN alloy surpasses at about 30% o'clock, and above-mentioned this way will be brought huge waste, can only stop the kiln maintenance this moment.And this phenomenon usually occurs in the production process of VN alloy, does not find the ideal terms of settlement so far as yet from document or patent.
And that method of the present invention can overcome is above-mentioned lower: pushed bat kiln of the present invention high-temperature region bulk temperature 1550 ℃～more than 1650 ℃ the time, carbon containing V
2O
5Pelletizing reduction and nitriding velocity are obviously accelerated, and substantially finish in the 3.5h reaction; And along with the time increases, finished product VN alloy pelletizing granularity increases, and shows after tested, and it is anti-to reoxidize ability and greatly strengthen, also almost no longer oxidized even be mixed with a small amount of air in the pushed bat kiln this moment.Therefore, when the pushed bat kiln system was taked the high temperature fast restore, as long as temperature is controlled at 1550～1650 ℃, and high temperature fast restore section accounted for about 50% of total production line length, so that carbon containing V
2O
5Pelletizing again in high-temperature region insulation a period of time, with regard to having solved the problem that VN alloy reoxidizes in the cooling zone, had both avoided secondary to enter the waste that stove causes behind fast restore reaction and nitridation reaction, more saved the significant cost that for this reason stops kiln inspection and repair shop need.
3, granularity also has material impact to the reduction temperature and the reduction rate of product.Although the more thin carbon containing V of granularity
2O
5Pelletizing reduces more soon, but pelletizing will have suitable size, for carbon containing V
2O
5Pelletizing high temperature fast restore, heat transfer are the restricted links of its reduction rate, so that the precondition of high temperature fast restore is the bed of material is thin.Thickness of feed layer is directly connected to the effect of heat transfer, and the bed of material is more thin, heat transfer is more good, reduction is also more fast.Want to increase granularity or the bed of material of carbonaceous pelletizing, must improve reduction temperature, with the heat transfer problem in the solution pelletizing, otherwise will be to reduce productive rate as cost.Method of the present invention is controlled at 1550～1650 ℃ with pushed bat kiln high-temperature region temperature, carbon containing V
2O
5The pelletizing width is 25～45mm, highly is 15～30mm, and effect was ideal when thickness of feed layer was 60～90mm.
Compared with prior art, the present invention has following obvious advantage:
1. according to carbonaceous pelletizing high temperature fast restore theory, carbon containing V
2O
5Pelletizing is more than 1450 ℃ the time, and need not the external world provides any reducing condition just the high temperature fast restore can take place again, continues to improve temperature, and its inner autoreduction speed is accelerated thereupon.Therefore when the pushed bat kiln high-temperature region remains on 1550～1650 ℃, can significantly reduce the VN alloy production time and improve the VN alloy output of unit burner hearth length.
Since when pushed bat kiln high-temperature zone bulk temperature more than 1550 ℃ the time, along with the time increases, finished product VN alloy pelletizing granularity increases, it is anti-to reoxidize ability and strengthens greatly, even it is also almost no longer oxidized to be mixed with little air at this moment in the pushed bat kiln.Therefore, when the pushed bat kiln system is taked the high temperature fast restore,, just overcome the problem that VN alloy reoxidizes in the cooling zone, guaranteed the quality of product as long as temperature is controlled at 1550～1650 ℃.
3. for carbon containing V
2O
5Pelletizing high temperature fast restore, heat transfer are the restricted links of its reduction rate, and the bed of material is more thin, heat transfer is more good, reduction is also more fast, when pushed bat kiln high-temperature region temperature is controlled between 1550～1650 ℃ carbon containing V
2O
5The pelletizing width is 25～45mm, highly is 15～30mm, when thickness of feed layer is 60～90mm, can guarantees that VN alloy is quick, efficient, produce continuously.
When production rate, when output is constant, the required effective heated length of high temperature fast restore method shortens greatly, this has also significantly reduced burner hearth material, lagging material, an electric heating element and power consumption, thereby has reduced the floor space of production cost and production line significantly.
Description of drawings
Fig. 1 is the structural representation of pushed bat kiln of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Embodiment
The method of continuous reduction production of VN alloy provided by the invention, it adopts the electrically heated pushed bat kiln to carry out the also original production continuously of VN alloy, and described electrically heated pushed bat kiln comprises:
Longitudinal feeding section I;
Be positioned at longitudinal feeding section I vertical reduction nitridation section afterwards;
Be positioned at vertical reduction nitridation section naturally cooling section III afterwards;
Be positioned at the vertical cooling water-cooled section V behind the nature cooling section III;
It is characterized in that: also comprise: at vertical naturally cooling section III with vertically cool off vertical nitrogen preheating section IV between the water-cooled section V; With
Evenly be installed on the Si-Mo rod heating unit 2 in described vertical high temperature reduction nitrogenize section II from front to back, described Si-Mo rod heating unit Si-Mo rod 2 vertical insertions in the heating unit chamber that forms between graphite carbon tile stove thorax 5 and the high-alumina refractory brick layer 10, and graphite carbon tile stove thorax 5 is bonded to the burner hearth integral body of sealing by carbonaceous mud;
Described vertical reduction nitridation section is vertical high temperature reduction nitrogenize section II, and its temperature is 1550～1650 ℃.
The step of described continuous reduction production of VN alloy is as follows:
By Si-Mo rod heating element heater 2 temperature of described vertical high temperature reduction nitrogenize section II is risen to 1550～1650 ℃, use external hydraulic means that carbon containing V will be housed
2O
5The crucible 4 of pelletizing advanced the propelling speed of a crucible length to push successively in the graphitic carbon tile stove thorax 5 of electrical heating pushed bat kiln with per 10～15 minutes; Leave nitrogen flow channel 1 between described crucible 4 and the graphitic carbon tile stove thorax 5; Carbon containing V is housed
2O
5The crucible 4 of pelletizing passes through longitudinal feeding section I, vertical high temperature reduction nitrogenize section II, vertical natural cooling section III, vertical nitrogen preheating section IV and vertical water quench section V successively under the promotion of external hydraulic means; In its process, carbon containing V
2O
5Pelletizing is finished reduction and nitridation reaction at high temperature reduction nitrogenize section II successively, carry out the nature cooling at vertical natural cooling section III, to carry out preheating by the nitrogen that nitrogen flow channel 1 flows at nitrogen preheating section IV, carry out water quench at vertical water quench section V again, finally generate vanadium-nitrogen alloy product.
Described carbon containing V
2O
5The pelletizing width is 25～45mm, highly is 15～30mm, carbon containing V
2O
5The pelletizing feed layer thickness is 60～90mm.
Described electrical heating pushed bat kiln burner hearth is of a size of 24.5m * 700mm * 264mm; Be used for holding carbon containing V in the burner hearth
2O
5The crucible 4 of pelletizing uses the graphitic carbon piece to make.
The longitudinal feeding section I length of described pushed bat kiln is 1.1m, and width is 1.5m; Described vertical high temperature reduction nitrogenize section II length is 12.5m, and width is 1.5m; Described vertical naturally cooling section III length is 1.2m, and width is 1.7m; Described vertical nitrogen preheating section IV length is 6.9m, and width is 1.5m; Described vertical cooling water-cooled section V length is 2.8m, and width is 1.2m.
The longitudinal feeding section I of the electrical heating pushed bat kiln that the present invention relates to, vertically high temperature reduction nitrogenize section II, vertical natural cooling section III, vertical nitrogen preheating section IV and vertically cool off water-cooled section V, the design of each section chamber structure is different, the insulation material structural configuration is also different, and detailed construction designs as depicted in figs. 1 and 2; Because Na in the vanadic anhydride raw material
2O+K
2O content is about 1wt%, so can produce a large amount of low melting point, alkali corrosion medium in the vanadium-nitrogen alloy sintering process; Because the graphite carbon brick has strong alkali resistance, for reducing corrosive environment to oxidation or the corrosion function of inner lining material, the electrical heating pushed bat kiln burner hearth liner that relates to all adopts the graphite carbon brick, thereby effectively prolong the life cycle of pushed bat kiln, size of burner hearth is that size of burner hearth is 24.5m * 700mm * 264mm, is used for holding simultaneously carbon containing V
2O
5The crucible 4 of pelletizing uses the graphitic carbon piece to make.Si-Mo rod heating unit 2 adopts Si-Mo rod, for preventing the corrosion of water vapour in the burner hearth, highly basic atmosphere to heating unit, with carbonaceous mud graphite carbon tile stove thorax 5 is bonded to the integral body of a sealing, makes burner hearth and lagging material resistance furnace high-alumina refractory brick 10 isolate fully; In the heating unit chamber that Si-Mo rod heating unit 2 vertical insertion graphite carbon tile stove thoraxes 5 and resistance furnace high-alumina refractory brick 10 form; because graphite carbon tile stove thorax 5 at high temperature has good thermostability and good heat conductivity; when therefore work in the heating unit chamber of Si-Mo rod heating unit 2 outside burner hearth; not only can guarantee heating efficiency to raw material in the burner hearth; but also can effectively protect Si-Mo rod heating unit 2, improve its work-ing life.
Longitudinal feeding section I total length is 1.1m, and pushed bat kiln outside surface width is 1.5m; Vertically high temperature reduction nitrogenize section II total length is 12.5m, and pushed bat kiln outside surface width is 1.5m; Vertically naturally cooling section HI total length is 1.2m, and pushed bat kiln outside surface width is 1.7m; Vertically nitrogen preheating section IV total length is 6.9m, and pushed bat kiln outside surface width is 1.5m; Vertically cooling water-cooled section V total length is 2.8m, and pushed bat kiln outside surface width is 1.2m, and cooling water plate is of a size of 150mm * 350mm * 500mm; Upper furnace lagging material 6 is high-alumina refractory brick 10, clay insulating refractory block 9, refractory fibre filler 8 and clod wash rectangle hollow shaped steel successively; The lower furnace portion lagging material is high alumina matter refratory insulating brick 11, clay insulating refractory block 9 and heat resistance concrete 12 successively.
Carbon containing V
2O
5Pelletizing enters burner hearth from longitudinal feeding section I, carries out the fast restore reaction through vertical high temperature reduction nitrogenize section II, generates successively V
2O
4, VO, V
2Nitridation reaction is taking place in the intermediate products such as C then and through the nitrogen after the preheating fast more than 1550 ℃; Nitrogen is from reverse the passing in the burner hearth of vertical cooling water-cooled section V, through vertical nitrogen preheating section IV, vertical natural cooling section III, enters vertical high temperature reduction nitrogenize section II, behind the nitrogen runner 1 that forms through the barricade 3 by graphite carbon brick processing and fabricating again, with carbon containing V
2O
5Pelletizing generation nitriding reaction finally generates vanadium-nitrogen alloy product.VN alloy after the nitrogenize is along with the prolongation in the humidity province time more than 1550 ℃, and the pelletizing granularity increases, and anti-ly reoxidizes ability and greatly strengthens, through vertical natural cooling section III, vertically be difficult for being reoxidized when nitrogen preheating section IV and cooling water-cooled section V.Whole reduction and nitridation process pressure in the burner hearth are kept pressure-fired all the time, and the waste gas that whole process produces expels from kiln from the venting port of vertical high temperature reduction nitrogenize section II section start.
In the test of trial production, by regulating Si-Mo rod heating unit 2 power, II is divided into three grades with electrically heated pushed bat kiln high temperature fast restore section before this enforcement, and one-level reduction zone fire box temperature is 670 ℃, and length is 3.1m; Second-stage reduction district fire box temperature is 1250 ℃, and length is 6.3m; Three grades of nitrogenize district fire box temperatures are 1450 ℃, and length is 3.1m; After the normal operation of pushed bat kiln, the every 30min of electrically heated pushed bat kiln goes out a defective material from the gas-tight silo discharge port, and there is a small amount of oxidized phenomenon on the VN alloy surface, upper strata of kiln discharge, product composition is: 77～81wt%V, 12～16wt%N, 5～6wt%C, 1.2wt%O, 0.45wt%Si, 0.05wt%P, 0.08wt%S, 0.20wt%Al, 0.05wt%Mn, the granularity of product is 10mm～30mm, wherein is not more than 5% of total amount less than the 10mm grade.
At present embodiment the omnidistance temperature of electrically heated pushed bat kiln high temperature fast restore section II burner hearth is controlled at 1550 ℃, length is 12.5m; After the normal operation of pushed bat kiln, through test, if reach the product composition identical with embodiment 1, only need the every 18min of electrically heated pushed bat kiln to go out a defective material from the gas-tight silo discharge port, there is the oxidized phenomenon of trace on the VN alloy surface, upper strata of kiln discharge, product composition is: 77～81wt%V, 12～16wt%N, 5～6wt%C, 1.0wt%O, 0.45wt%Si, 0.05wt%P, 0.08wt%S, 0.20wt%Al, 0.05wt%Mn, the granularity of product is 10mm～40mm, wherein is not more than 5% of total amount less than the 10mm grade.
At present embodiment the omnidistance temperature of electrically heated pushed bat kiln high temperature fast restore section II burner hearth is controlled at 1600 ℃, length is 12.5m; After the normal operation of pushed bat kiln, through test, if reach the product composition identical with embodiment 1, only need the every 15min of electrically heated pushed bat kiln to go out a defective material from the gas-tight silo discharge port, there is the oxidized phenomenon of trace on the VN alloy surface, upper strata of kiln discharge, product composition is: 77～81wt%V, 12～16wt%N, 5～6wt%C, 1.0wt%O, 0.45wt%Si, 0.05wt%P, 0.08wt%S, 0.20wt%Al, 0.05wt%Mn, the granularity of product is 10mm～45mm, wherein is not more than 5% of total amount less than the 10mm grade.
At present embodiment the omnidistance temperature of electrically heated pushed bat kiln high temperature fast restore section II burner hearth is controlled at 1650 ℃, length is 12.5m; After the normal operation of pushed bat kiln, through test, if reach the product composition identical with embodiment 1, only need the every 10min of electrically heated pushed bat kiln to go out a defective material from the gas-tight silo discharge port, VN alloy surface, upper strata and lower floor's solid colour of kiln discharge are not reoxidized, and product composition is: 77～81wt%V, 12～16wt%N, 5～6wt%C, 0.45wt%Si, 0.4wt%O, 0.05wt%P, 0.08wt%S, 0.20wt%Al, 0.05wt%Mn, the granularity of product is 10mm～50mm, wherein is not more than 5% of total amount less than the 10mm grade.
Can reach a conclusion as follows by the foregoing description:
When the vertical high temperature reduction nitrogenize of electrically heated pushed bat kiln section temperature remained on 1550～1650 ℃, the VN alloy production time significantly reduced, and had solved VN alloy simultaneously in the problem that cooling section reoxidizes, and had guaranteed the quality of product.
Claims (5)
1. the method for a continuous reduction production of VN alloy, it adopts the electrically heated pushed bat kiln to carry out the also original production continuously of VN alloy, and described electrically heated pushed bat kiln comprises:
Longitudinal feeding section (I);
Be positioned at longitudinal feeding section (I) vertical reduction nitridation section afterwards;
Be positioned at vertical reduction nitridation section natural cooling section (III) afterwards;
Be positioned at the vertical cooling water-cooled section (V) behind the nature cooling section (III);
It is characterized in that, also comprise the vertical nitrogen preheating section (IV) that is positioned between vertical naturally cooling section (III) and the vertical cooling water-cooled section (V); With
Evenly be installed on the Si-Mo rod heating unit (2) in described vertical high temperature reduction nitrogenize section (II) from front to back, described Si-Mo rod heating unit Si-Mo rod (2) vertically inserts in the heating unit chamber that forms between graphite carbon tile stove thorax (5) and the high-alumina refractory brick layer (10), and graphite carbon tile stove thorax (5) is bonded to the burner hearth integral body of sealing by carbonaceous mud;
Described vertical reduction nitridation section is vertical high temperature reduction nitrogenize section (II), and its temperature is 1550～1650 ℃.
The step of described continuous reduction production of VN alloy is as follows:
By Si-Mo rod heating element heater 2 temperature of described vertical high temperature reduction nitrogenize section (II) is risen to 1550～1650 ℃, use external hydraulic means that carbon containing V will be housed
2O
5The crucible of pelletizing (4) advanced the propelling speed of a crucible length to push successively in the graphitic carbon tile stove thorax (5) of electrical heating pushed bat kiln with per 10～15 minutes; Leave nitrogen flow channel (1) between described crucible (4) and the graphitic carbon tile stove thorax (5); Carbon containing V is housed
2O
5The crucible of pelletizing (4) passes through longitudinal feeding section (I), vertical high temperature reduction nitrogenize section (II), vertical natural cooling section (III), vertical nitrogen preheating section (IV) and vertical water quench section (V) successively under the promotion of external hydraulic means; In its process, carbon containing V
2O
5Pelletizing is finished reduction and nitridation reaction in high temperature reduction nitrogenize section (II) successively, carry out the nature cooling at vertical natural cooling section (III), to carry out preheating by the nitrogen that nitrogen flow channel (1) flows at nitrogen preheating section (IV), carry out water quench in vertical water quench section (V) again, finally generate vanadium-nitrogen alloy product.
2. by the method for the described continuous reduction production of VN alloy of claim 1, it is characterized in that described carbon containing V
2O
5The pelletizing width is 25～45mm, highly is 15～30mm, carbon containing V
2O
5The pelletizing feed layer thickness is 60～90mm.
3. by the method for the described continuous reduction production of VN alloy of claim 1, it is characterized in that the graphite carbon tile stove thorax (5) of described electrically heated pushed bat kiln is of a size of 24.5m * 700mm * 264mm.
4. by the method for the described continuous reduction production of VN alloy of claim 1, it is characterized in that the crucible that described crucible (4) is made for the graphite carbon piece.
5. by the method for the described continuous reduction production of VN alloy of claim 1, it is characterized in that longitudinal feeding section (I) length of described pushed bat kiln is 1.1m, width is 1.5m; Described vertical high temperature reduction nitrogenize section (II) length is 12.5m, and width is 1.5m; Described vertical naturally cooling section (III) length is 1.2m, and width is 1.7m; Described vertical nitrogen preheating section (IV) length is 6.9m, and width is 1.5m; Described vertical cooling water-cooled section (V) length is 2.8m, and width is 1.2m.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963446A (en) * | 2010-11-04 | 2011-02-02 | 四川展祥特种合金科技有限公司 | Vanadium and nitrogen alloy full-automatic vertical medium frequency induction heating furnace |
| CN103727783A (en) * | 2014-01-10 | 2014-04-16 | 四川展祥特种合金科技有限公司 | Vertical type vanadium-nitrogen alloy calcining kiln utilizing waste gas carbon monoxide |
| CN110306106A (en) * | 2019-06-14 | 2019-10-08 | 四川展祥特种合金科技有限公司 | A kind of reverse circulation is double to push away VN alloy process units and technique |
| CN114959174A (en) * | 2022-06-07 | 2022-08-30 | 西峡县丰业冶金材料有限公司 | High-strength hot-rolled ribbed steel bar produced by utilizing rare earth elements and production method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4562057A (en) * | 1984-03-29 | 1985-12-31 | Union Carbide Corporation | Preparation of low-carbon vanadium nitride |
| CN101289713B (en) * | 2007-04-20 | 2010-10-27 | 郸城财鑫特种金属有限责任公司 | Production process of vanadium-nitrogen alloy |
| CN101392333B (en) * | 2007-09-20 | 2010-12-22 | 杭州天港生物科技有限公司 | Vanadium-nitrogen alloy preparation method and device |
-
2010
- 2010-01-22 CN CN2010101002932A patent/CN101845566B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963446A (en) * | 2010-11-04 | 2011-02-02 | 四川展祥特种合金科技有限公司 | Vanadium and nitrogen alloy full-automatic vertical medium frequency induction heating furnace |
| CN101963446B (en) * | 2010-11-04 | 2012-05-23 | 四川展祥特种合金科技有限公司 | Vanadium and nitrogen alloy full-automatic vertical medium frequency induction heating furnace |
| CN103727783A (en) * | 2014-01-10 | 2014-04-16 | 四川展祥特种合金科技有限公司 | Vertical type vanadium-nitrogen alloy calcining kiln utilizing waste gas carbon monoxide |
| CN103727783B (en) * | 2014-01-10 | 2015-05-20 | 四川展祥特种合金科技有限公司 | Vertical type vanadium-nitrogen alloy calcining kiln utilizing waste gas carbon monoxide |
| CN110306106A (en) * | 2019-06-14 | 2019-10-08 | 四川展祥特种合金科技有限公司 | A kind of reverse circulation is double to push away VN alloy process units and technique |
| CN110306106B (en) * | 2019-06-14 | 2023-10-31 | 四川展祥特种合金科技有限公司 | Reverse circulation double-pushing vanadium-nitrogen alloy production device and process |
| CN114959174A (en) * | 2022-06-07 | 2022-08-30 | 西峡县丰业冶金材料有限公司 | High-strength hot-rolled ribbed steel bar produced by utilizing rare earth elements and production method thereof |
| CN114959174B (en) * | 2022-06-07 | 2024-01-12 | 西峡县丰业冶金材料有限公司 | High-strength hot rolled ribbed steel bar produced by rare earth element and production method thereof |
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