CN106636529A - System and method for processing vanadium-titanium magnetite - Google Patents
System and method for processing vanadium-titanium magnetite Download PDFInfo
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- CN106636529A CN106636529A CN201611014133.XA CN201611014133A CN106636529A CN 106636529 A CN106636529 A CN 106636529A CN 201611014133 A CN201611014133 A CN 201611014133A CN 106636529 A CN106636529 A CN 106636529A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- Chemical & Material Sciences (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
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Abstract
The invention discloses a system and a method for processing vanadium-titanium magnetite. The system comprises a raw material forming system, a direct reducing system of a rotary hearth furnace, a melting separation system and a converter vanadium extraction system. The invention further discloses a method for processing the converter vanadium extraction system by applying the system. The method comprises the following steps: making the vanadium-titanium magnetite, a reducing agent and a bonding agent into moisture-containing green pellets through the raw material forming system; performing reduction roasting through the direct reducing system of the rotary hearth furnace; conveying the reduced product pellets into the melting separation system for melting separation to obtain vanadium-containing molten iron and titanium slag; conveying the vanadium-containing molten iron into the converter vanadium extraction system for purging and vanadium extraction to obtain semi-steel and a vanadium pentoxide product. When the system disclosed by the invention is adopted for processing the vanadium-titanium magnetite, the undried vanadium-titanium magnetite green pellets can be directly conveyed into the furnace, so that the drying process is cancelled, the investment is reduced, and meanwhile, the energy consumption is reduced; while the sensible heat of a thermal reduction product is utilized, the metallization ratio is effectively improved.
Description
Technical field
The present invention relates to a kind of system for processing vanadium titano-magnetite, the invention further relates to process vanadium titanium using the system
The method of magnetic iron ore, belongs to the field of comprehensive utilization of vanadium titano-magnetite.
Background technology
Vanadium titano-magnetite is magnetic iron ore (Fe3O4)-ulvite (2FeOTiO2)-magnesium aluminate spinel (MgO
Al2O3)-ilmenite (FeOTiO2) closely symbiosis complex.Vanadium titano-magnetite is not only the important sources of iron, and companion
The component such as raw vanadium and titanium, with very high comprehensive utilization value.China's v-ti magnetite mineral deposit is widely distributed, rich reserves, storage
The 3rd that national iron ore is occupied with yield is measured, 98.3 hundred million tons of proved reserves, prospective reserves is main to divide up to more than 30,000,000,000 tons
Cloth is on Panxi, Sichuan (Panzhihua-Xichang) area, Chengde area, Hanzhong Area of Shaanxi, Hubei Yun county sun, Xiangyang area, mountain
The area such as eastern Linyi, Xingning of Guangdong Province and Shanxi Dai County, Chaoyang.In blast furnace-converter process stream that China and Russia adopt
Journey, titanium recovering effect is undesirable；Process vanadium titano-magnetite using rotary hearth furnace process at home at present gradually to grow up, but adopt
When rotary hearth furnace is processed, the process such as agglomeration, drying need to be carried out to raw material, technological process is longer, equipment is more, investment is larger,
Floor space is also larger.
Material forming (pressure ball or pelletizing)-drying-direct-reduction flow process being adopted rotary hearth furnace direct-reduction technique more, into
Pelletizing after type needs just be distributed into rotary hearth furnace after drying, therefore must be separately provided drying plant and dried；Additionally, Jing turns bottom
The metallized pellet of stove direct-reduction, also needs that rotary hearth furnace could be discharged after cooling, and by being arranged on rotary hearth furnace cooling section
On water-cooling wall cooled down, this also result in the waste of metallized pellet heat.
The Chinese invention patent of Publication No. CN1235268A discloses a kind of for rotary table, especially rotary hearth furnace
Charging and distribution device.The device includes material feed mechanism, and (2,3), material transfer mechanism (304) and material gravity are toppled over
Guide groove (4), the said equipment includes the staticizer of the distribution material for difference, and the mechanism includes toppling over the cloth of guide groove (4)
Material leading edge (214), it has profile of substantially curve, and the derivative of the curve is rotary table (10) in workbench
The incremental linear function of the radius of the part between the heart and its edge.Topple over the relative panoramic table (10) of guide groove (4) substantially radially
Arrange, and be arranged on one and be nearly parallel in the plane of the plane of the rotary table (10), and with a hopper (5)
Action together, the outlet edge (205) of the hopper is arranged near the surface of workbench, and with the cloth for toppling over guide groove (4)
The substantially similar curved profile of material leading edge (214).Topple over guide groove (4) many on the base portion of the guide groove (4) (204) by being fixed on
Individual next door (114) is separated into multiple passages (104), and guide groove (5) separates multiple passages (105), passage tool by multiple next doors (115)
There is the section as the material mouth of the passage (104) of guide groove (4).Feed equipment (103) includes that for manipulating guide groove (4) will be toppled over
Be separated into the mechanism in the next door (114) of passage (104), the next door can relatively described guide groove (4) base portion (204) is moved
It is dynamic.Meanwhile, feeding adjusting device includes dynamic mechanism (103), for carrying out difference on the whole cross section for toppling over guide groove (4)
Formula feed, the device be arranged on guide groove (4) and feed arrangement (2,3) between.Dynamic difference feeding device includes multiple gates
(113), these gates have appropriate separate operation device (123) and are configured to can control and separated by guide groove
Into each passage (104) entrance.These gates are all arranged on the chute formed on a top for toppling over guide groove (4)
(203) in.Apparatus above is by suitable hitch (101) on a support frame (1)；Existing for the method
Major defect is cannot to process the pelletizing do not dried, and needs to add stoving process in balling stage, increased process energy consumption；Simultaneously
Directly using the heat entrained by flue gas cannot increase heat loss.
The Chinese invention patent of Application No. 201510648755.7 discloses a kind of cooling in rotary hearth furnace and dries
Synchronous method is done, is comprised the following steps that：First, the red ball of rotary hearth furnace is equably fallen feed end A2's by the first deflector chute
On lower floor's carrier bar, while the rotary hearth furnace green-ball is equably fallen in the upper strata carrier bar of feed end B1 by the first distributing device
On；Secondly, by the rotating speed for adjusting the upper strata carrier bar and lower floor's carrier bar, it is ensured that the rotation direction of the two is contrary；Subsequently, cold sky
The red ball that gas rises and is placed through on lower floor's carrier bar, lowers the temperature to the red ball, at the same air temperature increase transitions into
Preheated air；Then, the preheated air continues to rise, and the green-ball being then passed through on the upper strata carrier bar is dried, in advance to the green-ball
Heat, while the preheated air temperature declines, is transformed into the hot-air containing certain heat；Finally, the hot-air is extracted, and enters
Falling dust room, then the dirt pocket is entered by the falling dust room, used in the air preheating system in rotary hearth furnace is proceeded to by the dirt pocket.
The red ball of rotary hearth furnace reduction product must be discharged in the method just can carry out outside rotary hearth furnace cooling treatment, not only need to be separately provided cold
But device, can also cause thermal losses；Additionally, cooling down using air to rotary hearth furnace reduction product, rotary hearth furnace product is easily caused
Oxidation, can reduce the degree of metalization of product, affect product quality.
Chinese Patent Application No. 201320041232.2 discloses a kind of multiple field steel mesh transmission dryer, and it includes：One
Multiple field steel mesh transmission dryer is planted, the dryer includes composite steel net conveyor, between adjacent two layers steel mesh conveyer belt
Direction of transfer is conversely, the upstream ends indentation of more next layer of steel mesh conveyer belt of downstream end of last layer steel mesh conveyer belt.Each layer of steel
Net conveyor is respectively connected with independent driver.The multiple field steel mesh transmission dryer that the utility model is provided, it is possible to achieve right
The drying and processing of different material, while while material handling capacity is increased, that is, meeting the requirement of high drying efficiency, saves and takes up an area
Area, and can reach the purpose of safety in production.The dryer of the method is only capable of realizing drying function, and needs to be used alone.
Summary is visible, in the technique that vanadium titano-magnetite is processed currently with rotary hearth furnace, the drying and reduction of green-ball
The cooling of product is respectively adopted different equipment and technique is processed, and takes up an area that face is big, and technological process is long, and efficiency of utilization is low,
This not only construction cost increase, can also cause the problems such as energy consumption index is higher, production cost is higher, it would be highly desirable to improve.
The content of the invention
An object of the present invention is to provide a kind of system for processing vanadium titano-magnetite；
The second object of the present invention is to provide a kind of method for processing vanadium titano-magnetite using the system；
Vanadium titano-magnetite is processed using the system and method for the present invention, the stoving process after shaping can be cancelled, turning bottom
Drying, the preheating of pelletizing, then the direct-reduction of Jing rotary hearth furnaces are realized in stove, molten point of stove fusing separates and bessemerize vanadium extraction from hot metal etc.
Operation, realizes the comprehensive utilization of v-ti magnetite ore resources.
The above-mentioned purpose of the present invention is achieved through the following technical solutions：
Present invention firstly provides a kind of system for processing vanadium titano-magnetite, including：Raw material formation system, rotary hearth furnace
Direct-reduction system, fusing piece-rate system and vanadium extraction by converter blowing system；Wherein, the outlet of raw material formation system is directly gone back with rotary hearth furnace
The material inlet of original system is communicated, and the outlet of rotary hearth furnace direct-reduction system is communicated with the material inlet of fusing piece-rate system, fusing point
Outlet from system is communicated with the material inlet of vanadium extraction by converter blowing system；
It is described exempt from drying direct-reduction rotary hearth furnace system include distribution device be dried and preheat, rotary hearth furnace preheating and directly
Reduction, rotary hearth furnace cooling, rotary hearth furnace discharging, its structure includes annular body of heater and rotatable ring-shaped furnace bottom, the annular body of heater by
Inner circumferential furnace wall, periphery furnace wall and annular furnace roof composition, inner circumferential furnace wall is coaxially disposed with periphery furnace wall, the inside and outside side of annular furnace roof
The top of inner circumferential furnace wall and periphery furnace wall is connected to, annular furnace is formed, described ring-shaped furnace bottom is correspondingly arranged at the annular
The lower section of burner hearth；Cloth area, preheating zone, middle warm area, high-temperature region and cooling zone are circumferentially disposed with the annular furnace,
And cooling zone and cloth area are adjacent, separated with the barricade of radial direction between cloth area and preheating zone, between high-temperature region and cooling zone,
Leaving between the lower end of the barricade and ring-shaped furnace bottom can be at least through the interval of one layer of material；The preheating zone, middle warm area and
Burner is housed on the internal and external circumferential furnace wall of high-temperature region, spiral discharging device is provided between the furnace bottom in cooling zone and cloth area, in chute
Gas spray is provided between rotary hearth furnace cooling zone and spiral discharging device below distributing device near the internal and external circumferential furnace wall of ring-shaped furnace bottom
Blowing apparatus；Rotary hearth furnace furnace roof above channel distributor is provided with exhaust chimney；Furnace bottom between the cloth area and cooling zone
It is provided with channel distributor and channel distributor cross section two ends is located between partition wall；Furnace roof pair above the channel distributor
Material inlet should be provided with the side of cooling zone；Multiple radiant tubes are set between channel distributor.
The channel distributor is constituted including multistage gravity chute, and wherein gravity chute quantity can be 2～5 sections,
If quantity is very few, green-ball easily causes accumulation on wall scroll chute, affects drying effect；If quantity is excessive, wall scroll chute
Undersized, the larger green-ball of particle diameter cannot be introduced into；Used as a kind of preferred structure, the channel distributor includes three sections of inclinations
Formula chute, i.e.,：First paragraph gravity chute, second segment gravity chute and the 3rd section of gravity chute, three sections of gravity chutes
Head and the tail are sequentially connected and alternate in circumferencial direction and stagger, and three sections of gravity chutes are connected simultaneously by two fixed-link devices
It is fixed together, the upper end of fixed-link device is connected with the vibrator positioned at furnace roof；As further preferred structure, wherein
One vibrator is located near material inlet；Three sections of gravity chutes are in sector, radian and the rotary hearth furnace circumference at its two ends
Radian on direction is consistent, and its cross section is parallel with rotary hearth furnace radial direction；First paragraph gravity chute, second segment tilting are slipped
Groove and each two dividing plates of freedom of the 3rd section of gravity chute and the chute runway composition being trapped among in dividing plate；Incline in second segment
The head end of the head end of formula chute and the 3rd section of gravity chute is respectively equipped with discharge flapper；First paragraph gravity chute chute runs
The head end in road is located at the underface of material inlet；Preferably, width and first paragraph gravity chute of the material inlet along rotary hearth furnace radial direction
Chute runway width it is identical.
The angle of another preferred structure to channel distributor of the present invention, gravity chute and horizontal plane is 5～
15 °, if angle is too small, pelletizing time of staying in distribution device is long, can affect production efficiency；If angle is excessive, pelletizing stops
Stay the time too short, it is impossible to reach sufficient drying effect, pelletizing can burst after into preheating zone；It is further preferred that
The angle of first paragraph gravity chute and level is 5～10 °, and the angle of second segment gravity chute and level is 8～13 °, the
The angle of three sections of gravity chutes and level is 10～15 °；The center of three sections of gravity chutes on spiral discharging device, the 3rd
The tail end of section gravity chute is located at the surface in cloth area, and the perigee distance rotary hearth furnace of the 3rd section of gravity chute tail end
Furnace bottom is highly 40～80mm.Thus, it can be ensured that channel distributor can pelletizing is uniform, smoothly cloth is to rotary furnace bottom,
And farthest reduce fragmentation phenomenon of the pelletizing in falling process.
Further improvement of the present invention to channel distributor, arranges multiple radiant tubes between three sections of gravity chutes,
The radiant tube arranged between three sections of gravity chutes is evenly arranged along rotary hearth furnace radial direction, and traverses in internal and external circumferential furnace wall
Between；Wherein, between first paragraph gravity chute and second segment gravity chute and in second segment gravity chute and
Multiple radiant tubes are uniformly arranged between three sections of gravity chutes along rotary hearth furnace radial direction；Wherein, the center of same layer radiant tube
Away from preferably 500～900mm；If apart from excessive, it is impossible to be heated to green pellets temperature required；If apart from too small, can cause
The waste of heat.
It is further preferred that the radiation temperature of the radiant tube is 200～1000 DEG C, if temperature is too low, it is impossible to play baking
Dry effect；If temperature is too high, can affect to radiate tube lifetime, while the radiation temperature of lower end radiant tube is higher than upper end radiant tube
Radiation temperature, it is possible thereby to adapt to different drying and requirement of the preheating section pelletizing to temperature.
The width of the blanking channel of gravity chute end is 100～200mm, and pelletizing thus can be made to drop down onto lower floor's chute；
Chute is provided with vibrator with rotary hearth furnace junction, realizes even feeding, prevents putty.
The gravity chute outlet of lowermost end is located in cloth area, is highly 40～80mm apart from rotary furnace bottom.If should
Highly excessive, pelletizing can be more easy to fragmentation during falling；If highly too small, bottom is heated excessively, affects the life-span of device.
The height of the dividing plate is 80～100mm, while it is highly higher by least 40mm than the bed of material；The chute runway
Bottom even is distributed with pore；Preferably, the pore is circular pore, it is furthermore preferred that the circular pore be a diameter of 4～
The circular pore of 7mm.Hole diameter is too small, and gas is little with the contact surface of green pellets, affects its drying effect, hole diameter mistake
Greatly, green pellets can leak down or be stuck in pore.Thus, qualified pelletizing uniformly cloth to channel distributor, and can ensure
Blowing gas and heat are smoothly moved upwards.
Further preferred structure of the present invention to channel distributor, the channel distributor is in circumferencial direction away from turning bottom
The distance of stove both sides furnace wall is 50～100mm；Thus chute feeder with up-down vibration, but can will not collide rotary hearth furnace
Side wall, and also pelletizing can be covered with rotary furnace bottom.
The barricade at channel distributor two ends is highly 60～150mm apart from rotary furnace bottom, for by cooling zone, cloth area
Open with other zone isolations, it is ensured that blowing gas do not interfere with other zone atmospheres while cooling to high-temperature metal pellet,
And the gas after exchanging heat can up drying and preheating green-ball；Additionally, also not interfering with the material movement in each region.If barricade distance
Furnace bottom is highly excessive, it is impossible to ensure isolation effect, if highly too small, can affect motion of the material in stove.
The reducibility gas of the gas blowing device injection, the reducibility gas are coal gas, blast furnace gas or Jiao
One or more in producer gas.
Invention further provides the method for processing vanadium titano-magnetite using described system, including：
(1) mixing of vanadium titano-magnetite, reducing agent and binding agent is made the green pellets of moisture content by raw material formation system；
(2) aqueous green pellets is distributed into channel distributor by the material inlet that rotary hearth furnace is reduced directly system, by slipping
The chute runway of groove distributing device progressively declines and is distributed into cloth area finally by blanking channel；Wherein, gas blowing device injection
Reducibility gas and the high temperature reduction product for entering into cooling zone carry out heat exchange and produce preheating gas, up preheating gas
And the radiations heat energy of the radiant tube generation being arranged in channel distributor green pellets jointly to progressively declining in chute runway
Carrying out heating, drying is preheated pelletizing；
The blanking channel of the most latter end that the pelletizing of preheating passes through channel distributor reaches rotary hearth furnace feed zone, sequentially passes through and turns
There is reduction reaction in bottom stove preheating zone, middle warm area, high-temperature region, obtain the reduzate of high temperature；The reduzate of high temperature enters cold
But the gas that area is blown with gas blowing device is contacted, and the reduzate of high temperature is cooled down, and the reduzate pelletizing after cooling leads to
Cross reduzate drawing mechanism to discharge out of the furnace；The preheating gas for being given to generation in cooling procedure go upward to cloth in the presence of barricade
It is used to dry aqueous green-ball in material device；
(3) the reduzate pelletizing for discharging out of the furnace is sent into into fusing piece-rate system carries out molten point, obtains vanadium-bearing hot metal and titanium
Slag；
(4) vanadium-bearing hot metal is sent into after vanadium extraction by converter blowing system purge vanadium extraction, obtains half steel and vanadic anhydride product.
Vanadium titano-magnetite aqueous 8%～10% in step (1), aqueous 2%～5% after reduction coal drying.
Vanadium titano-magnetite green-ball moisture described in step (2) is less than 15%；Thus, using conventional pelletizing or pressure
The pelletizing of ball technique output can directly be distributed into rotary hearth furnace and is reduced directly.
The gas of gas blowing device injection is blast furnace gas, coke-stove gas and the coal gas of normal temperature in step (3)；
The temperature of reduzate is 700～800 DEG C after step (3) cooling；Thus the pelletizing surface of reduzate occurs bright
Aobvious hardening, is conducive to the transport of reduzate, and provides good material condition for molten point process, while at this temperature
Reduzate carries out molten timesharing, and fusing separation process and energy consumption are not significantly affected.
Described reducing agent is to reduce any one or more than one in carbon, semi-coke, petroleum coke, coal or semicoke according to appointing
The mixture of meaning ratio composition；Described additive is binding agent, it is preferred that the binding agent is lime stone or bentonite.
Vanadium titano-magnetite is processed using present system, aqueous vanadium titano-magnetite green-ball can be realized drying in rotary hearth furnace
Dry, preheating, eliminates stoving process above, then Jing after rotary hearth furnace direct-reduction, fusing are separated and vanadium extraction by converter blowing is processed, you can
Realize the comprehensive utilization of valuable element in vanadium titano-magnetite.
In sum, using system and method for the present invention process, vanadium titano-magnetite is main has the beneficial effect that：
(1) the vanadium titano-magnetite green-ball do not dried can be adopted directly to enter stove, eliminates the drying flow process of technique front end, be saved
About invest, while reducing energy consumption.
(2) while using hot reduzate sensible heat, its degree of metalization can also be improved.
Description of the drawings
The rotary hearth furnace of Fig. 1 present invention processes the structural representation of the system of vanadium titano-magnetite.
The schematic flow sheet of Fig. 2 rotary hearth furnace Direct Reductions of the present invention.
The rotary hearth furnace overlooking the structure diagram of Fig. 3 present invention.
The chute structure top view of Fig. 4 present invention.
The chute cross-sectional view of Fig. 5 present invention.
Fig. 6 channel distributors of the present invention are in rotary hearth furnace circumferencial direction structural representation.
Description of reference numerals：
1st, cloth area；2nd, preheating zone；3rd, middle warm area；4th, high-temperature region；5th, cooling zone；6th, dividing plate；7th, gas blowing device；8、
Pore；9th, discharge flapper；10th, spiral discharging device；11st, chute runway；12nd, chute 1；13rd, chute 2；14th, chute 3；15th, vibrate
Dispenser；16th, fixed-link device；17th, radiant tube；18th, barricade；19th, exhaust chimney；20th, material inlet.
Specific embodiment
Further describe the present invention with reference to specific embodiment, advantages of the present invention and feature will be with description and
It is apparent.It should be understood that the embodiment is only exemplary, any restriction is not constituted to the scope of the present invention.This area
Technical staff should be understood that without departing from the spirit and scope of the invention can to the details of technical solution of the present invention and
Form is modified or is replaced, but these modifications or replacement each fall within protection scope of the present invention.
With reference to Fig. 1-Fig. 2, raw material formation system S100, rotary hearth furnace direct-reduction system S200, fusing piece-rate system S300
With vanadium extraction by converter blowing system S400；Wherein, the discharging opening of raw material formation system S100 is reduced directly entering for system S200 with rotary hearth furnace
Material mouth is communicated, and the discharging opening of rotary hearth furnace direct-reduction system S200 is communicated with the feeding mouth of fusing piece-rate system S300, fusing point
Discharging opening from system S300 is communicated with the feeding mouth of vanadium extraction by converter blowing system S400；
With reference to Fig. 3-Fig. 6, drying direct-reduction rotary hearth furnace system S200 of exempting from includes that distribution device is dried and preheats
S201, rotary hearth furnace preheating and direct-reduction S202, rotary hearth furnace cooling S203, rotary hearth furnace discharging S204, its structure includes annular furnace
Body and rotatable ring-shaped furnace bottom, the annular body of heater is made up of inner circumferential furnace wall, periphery furnace wall and annular furnace roof, inner circumferential furnace wall with it is outer
All furnace walls are coaxially disposed, and the inside and outside side of annular furnace roof is connected to the top of inner circumferential furnace wall and periphery furnace wall, form annular furnace
Thorax, described ring-shaped furnace bottom is correspondingly arranged at the lower section of the annular furnace；Cloth is circumferentially disposed with the annular furnace
Area 1, preheating zone 2, middle warm area 3, high-temperature region 4 and cooling zone 5, and cooling zone 5 and cloth area 1 are adjacent, cloth area 1 and preheating zone 2
Between, separated with the barricade 18 of radial direction between high-temperature region 4 and cooling zone 5, stay between the lower end of the barricade 18 and ring-shaped furnace bottom
Having can be at least through the interval of one layer of material；It is equipped with the internal and external circumferential furnace wall of the preheating zone 2, middle warm area 3 and high-temperature region 4
Burner, is provided with spiral discharging device 10 between the furnace bottom in cooling zone 5 and cloth area 1, and the rotary hearth furnace below channel distributor is cold
But the internal and external circumferential furnace wall between area 5 and spiral discharging device 10 near ring-shaped furnace bottom is provided with gas blowing device 7；Corresponding to
Rotary hearth furnace furnace roof above channel distributor is provided with the device 19 of the lead Zn-ef ficiency for reclaiming volatilization；Wherein, in the cloth area 1 and cold
But the furnace bottom between area 5 is provided with channel distributor, and channel distributor cross section two ends are located between partition wall 18a, 18b；
Furnace roof above the channel distributor is provided with material inlet 20 corresponding to the side of cooling zone 5；Arrange between channel distributor many
Individual radiant tube 17.
The gas of the injection of the gas blowing device 7 is reducibility gas, and the reducibility gas are coal gas, blast furnace coal
One or more in gas or coke-stove gas.
Distance of the channel distributor in circumferencial direction away from rotary hearth furnace both sides furnace wall is 50～100mm.
The channel distributor includes multistage gravity chute；As a kind of preferred structure, the channel distributor bag
Three sections of gravity chutes are included, i.e.,：First paragraph gravity chute 12, second segment gravity chute 13 and the 3rd section of gravity chute
14, three sections of head and the tail of gravity chute 12,13,14 are sequentially connected and alternate in circumferencial direction and stagger, three sections of gravity chutes
12nd, 13,14 be connected and fixed to together by two fixed-link devices 16, the upper end of fixed-link device 16 be located at furnace roof
Vibrator 15 be connected；Preferably, one of vibrator 15 is located near material inlet 20；Three sections of gravity chutes 12,13,14
In sector, the radian at its two ends is consistent with the radian on rotary hearth furnace circumferencial direction, and its cross section is put down with rotary hearth furnace radial direction
OK；Each two dividing plates 6 of freedom of first paragraph gravity chute 12, second segment gravity chute 13 and the 3rd section of gravity chute 14
And be trapped among in dividing plate chute runway 11a, 11b, 11c composition；Second segment gravity chute 13 head end and the 3rd section
The head end of gravity chute 14 is respectively equipped with discharge flapper 9a, 9b；The head end position of the chute runway 11a of first paragraph gravity chute 12
In the underface of material inlet 20；Used as preferred structure, material inlet 20 is slipped along the width of rotary hearth furnace radial direction with first paragraph tilting
The width of the chute runway 11a of groove 12 is identical；The angle of first paragraph gravity chute 12 and level is 5～10 °, and second segment is inclined
The angle of formula chute 13 and level is 8～13 °, and the angle of the 3rd section of gravity chute 14 and level is 10～15 °；Three sections of inclinations
On spiral discharging device 10, the tail end of the 3rd section of gravity chute 13 is being located at cloth area just at the center of formula chute 12,13,14
Top, and the perigee distance rotary furnace bottom of the 3rd section of tail end of gravity chute 14 is highly 40～80mm.
The height of the dividing plate 6 is 80～100mm, while it is highly higher by least 40mm than the bed of material；The chute runway
The bottom even of 11a, 11b, 11c is distributed with pore 8；Used as a kind of preferred structure, the pore 8 is circular pore, more
Preferably, the circular pore is the circular pore of a diameter of 4～7mm.
As a kind of preferred concrete structure, between first paragraph gravity chute 12 and second segment gravity chute 13 with
And it is uniformly arranged multiple spokes along rotary hearth furnace radial direction between second segment gravity chute 13 and the 3rd section of gravity chute 14
Penetrate pipe 17；
The radiation temperature of the radiant tube 17 is 200～1000 DEG C, if temperature is too low, it is impossible to play the effect of drying；If
Temperature is too high, then can affect to radiate tube lifetime, while radiation temperature of the radiation temperature of lower end radiant tube higher than upper end radiant tube,
It is possible thereby to adapt to different drying and requirement of the preheating section pelletizing to temperature.
The operation principle for exempting to dry direct-reduction rotary hearth furnace system S200 is as follows：Green pellets is by vibrator 15
The batcher arranged outside upper, rotary hearth furnace is fed, and is slowly moved down via chute 12, is reached chute end and is kept off by blanking
Plate 9a is given to chute 13, then after slowly moving down via chute 13, reaches chute end by discharge flapper 9b to chute
14, finally complete cloth via the cloth area 1 of the even feeding of chute 14 to rotary furnace bottom；The green-ball of drying is sequentially passed through and turns bottom
Stove preheating zone 2, middle warm area 3, high-temperature region 4, in the process pelletizing will not occur obvious Decrepitation Phenomena, while it is anti-that reduction occurs
Should, generate the metallized pellet of high temperature；High-temperature metal pellet is reached behind cooling zone 5, the reduction with the injection of gas blowing device 7
Property gas carry out heat exchange, play the purpose of cooling pelletizing so that thermal state metal pellet further reduction and fast in cooling zone 5
Quickly cooling but, while gas is preheated；On the one hand there is heat exchange, high temperature pelletizing by gas cooling, and on the gas for preheating continues
Row is used to dry green pellets；Another aspect reducibility gas can further reduce the ferriferous oxide of metallized pellet, help
In the reduction effect for improving iron；Moved upwards by the effect of barricade 18, and the circle by arranging on chute 12,13,14
Pore 8 passes to green pellets, and radiant tube 17 is also radiated to green pellets by the heat produced using gas fuel burning, common right
Green pellets is preheated and is dried, and is further reduced pelletizing moisture, is improved pelletizing preheating temperature, is dried and pre- thermogenetic volatilization
The lead zinc of property is then reclaimed by retracting device 19.Green pellets is after preliminary preheating and being dried, then the cloth area for being distributed into rotary hearth furnace
1, then preheating zone 2, middle warm area 3, high-temperature region 4 and cooling zone 5 are sequentially passed through, pelletizing will not occur substantially in Direct Reduction
Direct reduction reactor is burst and completes, then Jing discharging spirals 10 are discharged outside rotary hearth furnace, the metallized pellet after being cooled down.By
This, green pellets need not be individually through drying device, and the furnace roof in rotary hearth furnace cooling zone 5 need not design water-cooling wall, you can realize
Green-ball is directly distributed into rotary hearth furnace and is reduced directly, while thermal state metal pellet is cooled down and its heat obtains comprehensive profit
With, the efficiency of utilization of rotary hearth furnace is improve, equipment investment and floor space are reduced, further reduce production cost.
The solution of the present invention is explained below in conjunction with embodiment.It will be understood to those of skill in the art that following
Embodiment is merely to illustrate the present invention, and should not be taken as limiting the scope of the invention.
Embodiment 1
Certain vanadium titano-magnetite, its composition is TFe 7.14%, TiO210.21%, V2O50.68%, aqueous 10%；Certain is also
Raw coal, fixed carbon 70%, aqueous 2%.
Vanadium titano-magnetite, reduction coal and organic binder bond are mixed according to a certain percentage using raw material formation system S100
Aqueous green-ball, water content 10% are made after even.
Aqueous green-ball is distributed into into rotary hearth furnace by distribution device and is reduced directly system S200；The distribution device is chute type cloth
Glassware, including feeder channel, three sections with horizontal plane have certain angle gravity chute (chute 1, chute 2, chute 3), arrange
Radiant tube 17, vibra feeder 15 and fixing device 16 in gravity chute, is fixed by fixed-link device 16, is led to
Crossing the transmission of vibra feeder 15 carries out vibrating feed.
Wherein, it is 500mm with the centre-to-centre spacing of layer radiant tube 17,200 DEG C of temperature, chute 1 and horizontal plane angle are 5 °, chute 2
It it is 8 ° with horizontal plane angle, chute 3 and horizontal plane angle are 10 °, the lowermost end of chute 3 is highly 40mm apart from furnace bottom, chute 3
Outlet be located at cloth area 1 on.Distance of the chute feeder along the two ends of rotary hearth furnace radial direction away from rotary hearth furnace side wall be
100mm。
3 feeding chutes, and chute radian and the radian on rotary hearth furnace circumferencial direction are divided into by twice dividing plate 6 in chute
Unanimously, chute cross section is parallel with rotary hearth furnace radial direction, and the height of dividing plate 6 is 60mm, and chute inner bottom part is evenly distributed with diameter
For the circular pore 8 of 4mm.There is width chute end and is provided with vibrating feed for 100mm blanking channels, chute and rotary hearth furnace junction
Device 15, it is ensured that pelletizing even feeding, avoid putty.
The barricade 18 at distribution device two ends is highly 60mm apart from rotary furnace bottom.
Pelletizing enters rotary hearth furnace cloth area 1 by the blanking channel of chute 3 of distribution device lowermost end, sequentially passes through preheating zone
2nd, middle warm area 3, high-temperature region 4, pelletizing this stage residence time be 20min, the temperature of high-temperature region 4 be 1380 DEG C, the 1330 of generation
High temperature reduction product more than DEG C reaches cooling zone 5, and its degree of metalization is 88%.
Cooling zone 5 is provided with gas blowing device 7, and its blowing gas oxygen content is coal gas.Blowing gas are with high temperature also
Original thing contact, further reduces the part iron in product while cooling pelletizing, and the degree of metalization for improving reduzate is
More than 93%.Gas after preheating goes upward to distribution device, and aqueous green-ball is carried out into drying preheating, subsequently produces with drying course
Vapor discharge from exhaust chimney 19 together；By reduzate drawing mechanism, (spiral goes out 700～800 DEG C of reduzate
Glassware) 10 discharge rotary hearth furnaces.
Hot fusing piece-rate system S300 that is sent directly into of reduzate carries out molten point, obtains vanadium-bearing hot metal and titanium slag, titanium slag
Middle grade of titanium dioxide is 57.9%；Vanadium-bearing hot metal is sent into after the purging vanadium extraction of vanadium extraction by converter blowing system S400, obtains half steel and vanadium slag,
V slag grade is 14.5%.
Embodiment 2
Certain vanadium titano-magnetite, its composition is TFe 52.11%, TiO2 18.03%, V2O5 0.79%, aqueous 11%；Certain
Reduction coal, fixed carbon 75%, aqueous 5%；
Vanadium titano-magnetite, reduction coal and organic binder bond are mixed according to a certain percentage using raw material moulding moulded system S100
Aqueous green-ball, water content 12% are made after closing uniformly.
The distribution device is chute feeder, including feeder channel, four sections of tiltings for having certain angle with horizontal plane
Chute (chute 1, chute 2, chute 3 and chute 4), vibra feeder 15, radiant tube 17 and fixed-link device 16, four sections of chutes
Between join end to end, be fixed by fixed-link device 16, by vibra feeder transmission carry out vibrating feed.
Wherein, with the centre-to-centre spacing of layer radiant tube 17 be 700mm, 500 DEG C of temperature；Chute 1 and horizontal plane angle are 6 °, chute 2
It it is 8 ° with horizontal plane angle, chute 3 and horizontal plane angle are 10 °, chute 4 and horizontal plane angle are 12 °, the lowermost end of chute 4
Highly it is 60mm apart from furnace bottom, the outlet of chute 4 is located on cloth area 1.Chute feeder is along rotary hearth furnace radial direction
Distance of the two ends away from rotary hearth furnace side wall is 150mm.
4 feeding chutes, and chute radian and the radian on rotary hearth furnace circumferencial direction are divided into by twice dividing plate 6 in chute
Unanimously, chute cross section is parallel with rotary hearth furnace radial direction, and the height 70mm of dividing plate 6, the chute inner bottom part is evenly distributed with directly
Footpath is the circular pore 8 of 5mm.There is a blanking channel of width 150mm chute end, chute and rotary hearth furnace junction be provided with vibration to
Glassware 15, it is ensured that pelletizing even feeding, avoid putty.
The barricade 18 at distribution device two ends is highly 110mm apart from rotary furnace bottom.
Pelletizing enters rotary hearth furnace cloth area 1 by the blanking channel of distribution device lowermost end chute, sequentially passes through preheating zone
2nd, middle warm area 3, high-temperature region 4, pelletizing this stage residence time be 35min, the temperature of high-temperature region 4 be 1350 DEG C, the 1300 of generation
High temperature reduction product more than DEG C reaches cooling zone 5, and its degree of metalization is 90%.
Cooling zone 5 is provided with gas blowing device 7, and its blowing gas oxygen content is blast furnace gas.Blowing gas and high temperature
Reduzate is contacted, and further reduces the part iron in product while cooling pelletizing, improves the degree of metalization of reduzate
For more than 93%.Gas after preheating goes upward to distribution device, and aqueous green-ball is carried out into drying preheating, subsequently produces with drying course
Raw vapor is discharged together from exhaust chimney 19.700～800 DEG C of reduzate passes through reduzate drawing mechanism (spiral shell
Screw out glassware) 10 discharge rotary hearth furnaces.
Hot fusing piece-rate system S300 that is sent directly into of reduzate carries out molten point, obtains vanadium-bearing hot metal and titanium slag, titanium slag
Middle grade of titanium dioxide is 57.8%；Vanadium-bearing hot metal is sent into after the purging vanadium extraction of vanadium extraction by converter blowing system S400, obtains half steel and vanadium slag,
V slag grade is 19.2%.
Embodiment 3
Certain vanadium titano-magnetite, its composition is TFe 56.27%, TiO2 15.98%, V2O5 1.59%, aqueous 12%；Certain
Reduction coal, fixed carbon 81%, aqueous 5%；
Vanadium titano-magnetite, reduction coal and organic binder bond are mixed according to a certain percentage using raw material formation system S100
Aqueous green-ball, water content 15% are made after even.
The pelletizing is distributed into into rotary hearth furnace by distribution device.The distribution device be chute feeder, including feeder channel,
Five sections of gravity chute (chute 1, chute 2, chute 3, chute 4 and chute 5), vibra feeders for having certain angle with horizontal plane
15th, radiant tube 17 and fixed-link device 16, join end to end between five sections of chutes, are fixed by fixed-link device 16, lead to
Crossing the transmission of vibra feeder 16 carries out vibrating feed.
Wherein, it is 900mm with the centre-to-centre spacing of layer radiant tube 17,900 DEG C of temperature, chute 1 and horizontal plane angle are 5 °, chute 2
It it is 7 ° with horizontal plane angle, chute 3 and horizontal plane angle are 9 °, chute 4 and horizontal plane angle are 12 °, and chute 5 and horizontal plane are pressed from both sides
Angle is 15 °, and the lowermost end of chute 5 is highly 80mm apart from furnace bottom, and the outlet of chute 5 is located on cloth area 1.Chute type cloth
Distance of the device along the two ends of rotary hearth furnace radial direction away from rotary hearth furnace side wall is 200mm.
Chute is divided into 2 endless tracks, and endless track radian and the arc on rotary hearth furnace circumferencial direction by twice dividing plate 6
Degree is consistent, cross section is parallel with rotary hearth furnace radial direction, and the height 80mm of dividing plate 6, chute bottom even is distributed with a diameter of 5mm's
Circular pore 8.There is the striker plate 9 of width 200mm blanking channels the end of every section of gravity chute.
The barricade 18 at distribution device two ends is highly 150mm apart from rotary furnace bottom.
Pelletizing enters rotary hearth furnace cloth area 1 by the outlet of distribution device lowermost end gravity chute, sequentially passes through preheating zone
2nd, middle warm area 3, high-temperature region 4, pelletizing this stage residence time be 30min, the temperature of high-temperature region 4 be 1360 DEG C, the 1310 of generation
High temperature reduction product more than DEG C reaches cooling zone 5, and its degree of metalization is 89%.
Cooling zone 5 is provided with gas blowing device 7, and its blowing gas oxygen content is coal gas.Blowing gas are with high temperature also
Original thing contact, further reduces the part iron in product while cooling pelletizing, and the degree of metalization for improving reduzate is
More than 93%.Gas after preheating goes upward to distribution device, and aqueous green-ball is carried out into drying preheating, subsequently produces with drying course
Vapor together from exhaust chimney 19 discharge.700～800 DEG C of reduzate passes through reduzate drawing mechanism (spiral
Discharger) 10 discharge rotary hearth furnaces.
Hot fusing piece-rate system S300 that is sent directly into of reduzate carries out molten point, obtains vanadium-bearing hot metal and titanium slag, titanium slag
Middle grade of titanium dioxide is 58.4%；Vanadium-bearing hot metal is sent into after the purging vanadium extraction of vanadium extraction by converter blowing system S400, obtains half steel and vanadium slag,
V slag grade is 21.5%.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.For example change chute into chain-plate type, net belt type etc..
Claims (10)
1. it is a kind of process vanadium titano-magnetite system, it is characterised in that include：Raw material formation system (S100), rotary hearth furnace are direct
Also original system (S200), fusing piece-rate system (S300) and vanadium extraction by converter blowing system (S400)；Wherein, raw material formation system (S100)
Discharging opening and rotary hearth furnace be reduced directly the feeding mouth of system (S200) and communicate, the discharging of rotary hearth furnace direct-reduction system (S200)
Mouth is communicated with the feeding mouth of fusing piece-rate system (S300), melts the discharging opening and vanadium extraction by converter blowing system of piece-rate system (S300)
(S400) feeding mouth is communicated；
Rotary hearth furnace direct-reduction system (S200) includes annular body of heater and rotatable ring-shaped furnace bottom, in the rotary hearth furnace
Cloth area (1), preheating zone (2), middle warm area (3), high-temperature region (4) and cooling zone (5) are circumferentially disposed with annular furnace,
And cooling zone (5) and cloth area (1) are adjacent, between cloth area (1) and preheating zone (2), between high-temperature region (4) and cooling zone (5)
Separated with the barricade (18) of radial direction, leaving between the lower end of the barricade (18) and ring-shaped furnace bottom can be at least through one layer of material
Interval；Burner is housed on the internal and external circumferential furnace wall of the preheating zone (2), middle warm area (3) and high-temperature region (4), in cooling zone (5)
Spiral discharging device (10) is provided with and the furnace bottom of cloth area (1) between, on the furnace bottom between the cloth area (1) and cooling zone (5)
Channel distributor is provided with, and channel distributor cross section two ends are located between partition wall (18a, 18b)；Above the channel distributor
Furnace roof be provided with material inlet (20) corresponding to the side of cooling zone (5)；Rotary hearth furnace cooling zone (5) below channel distributor and
Internal and external circumferential furnace wall between spiral discharging device (10) near ring-shaped furnace bottom is provided with gas blowing device (7)；In channel distributor
The rotary hearth furnace furnace roof of top is provided with exhaust chimney (19)；In the multiple radiant tubes of channel distributor middle setting (17).
2. system according to claim 1, it is characterised in that：The channel distributor includes that multistage has necessarily with horizontal plane
The gravity chute of angle, radiant tube (17), vibrator (15) and fixing device (16) and discharge flapper (9) are constituted, and each section is inclined
Inclined chute head and the tail are sequentially connected and alternate mistake in circumferencial direction and are arranged to make up continuous material decline passway；Discharge flapper
(9a, 9b) is arranged on every section of chute head end；Fixing device by each section of gravity chute be fixed together and with the vibrator of furnace roof
(15) it is connected.
3. system according to claim 2, it is characterised in that：Each section of gravity chute respectively by 4 dividing plates (6) and is trapped among
3 chute runways (11) composition in dividing plate；The chute runway of first section gravity chute (12) be located at material inlet (20) just under
Side；The end of the chute runway of latter end gravity chute is blanking channel, and the blanking channel is located at the top in cloth area.
4. the system according to Claims 2 or 3, it is characterised in that：Per between two sections of gravity chutes along rotary hearth furnace radially
Direction is uniformly arranged one layer of radiant tube (17), and traverses between internal and external circumferential furnace wall.
5. system according to claim 1, it is characterised in that：Barricade is provided with the cross section two ends of channel distributor to be located at
The position of the gas blowing device (7) on internal and external circumferential furnace wall is higher than on the bed of material of cooling zone material；In channel distributor
The distance between the barricade (18a, 18b) and furnace bottom at cross section two ends are 60～150mm.
6. the method that the system any one of a kind of utilization claim 1-5 processes vanadium titano-magnetite, it is characterised in that bag
Include：
(1) vanadium titano-magnetite, reducing agent and binding agent are mixed and the green pellets that (S100) makes moisture content is molded by raw material；
(2) aqueous green pellets is distributed into channel distributor by the material inlet (20) that rotary hearth furnace is reduced directly system (S200),
Progressively declined by the chute runway (11) of channel distributor and be distributed into cloth area (1) finally by blanking channel；Wherein, gas
The reducibility gas of blowing device (7) injection carry out heat exchange and produce preheating with the high temperature reduction product for entering into cooling zone (5)
The radiations heat energy that gas, up preheating gas and the radiant tube (17) being arranged in channel distributor are produced is jointly to slipping
The green pellets that groove runway (11) progressively declines carries out heating, drying is preheated pelletizing；
The blanking channel of the most latter end that the pelletizing of preheating passes through channel distributor reaches rotary hearth furnace cloth area (1), sequentially passes through and turns
There is reduction reaction in bottom stove preheating zone (2), middle warm area (3), high-temperature region (4), obtain the reduzate of high temperature；High temperature is also originated in
Thing is contacted into the reducibility gas that cooling zone (5) are blown with blowing gas device (7), and the reduzate of high temperature is cooled down, cold
But the reduzate pelletizing after is discharged out of the furnace by reduzate drawing mechanism (10)；The pre- hot gas of generation is given in cooling procedure
Body to go upward to be used in distribution device in the presence of barricade (18) dries aqueous green-ball；
(3) the reduzate pelletizing for discharging out of the furnace is sent into into fusing piece-rate system (S300) carries out molten point, obtain vanadium-bearing hot metal and
Titanium slag；
(4) vanadium-bearing hot metal is sent into after vanadium extraction by converter blowing system (S400) purging vanadium extraction, obtains half steel and vanadic anhydride product.
7. in accordance with the method for claim 6, it is characterised in that：Aqueous 8 weight %～10 weight of vanadium titano-magnetite in step (1)
Amount %, aqueous 2 weight %～5 weight % after reduction coal drying.
8. method according to claim 6, it is characterised in that：Vanadium titano-magnetite green-ball moisture described in step (2)
Less than 15 weight %.
9. method according to claim 6, it is characterised in that：The gas of gas blowing device (7) injection is in step (3)
The blast furnace gas of normal temperature, coke-stove gas and coal gas.
10. method according to claim 6, it is characterised in that：Step (3) cooling after reduzate temperature be 700～
800℃。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108893573A (en) * | 2018-06-08 | 2018-11-27 | 上海宝幢新能源科技有限公司 | A kind of combustion optimizing system and method for rotary hearth furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108893573A (en) * | 2018-06-08 | 2018-11-27 | 上海宝幢新能源科技有限公司 | A kind of combustion optimizing system and method for rotary hearth furnace |
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