CN206956110U - The system for preparing vanadium titanyl pellet - Google Patents
The system for preparing vanadium titanyl pellet Download PDFInfo
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- CN206956110U CN206956110U CN201720286015.8U CN201720286015U CN206956110U CN 206956110 U CN206956110 U CN 206956110U CN 201720286015 U CN201720286015 U CN 201720286015U CN 206956110 U CN206956110 U CN 206956110U
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Abstract
The utility model discloses the system for preparing vanadium titanyl pellet, the system includes：Pretreatment unit, there is sefstromite entrance, water out and sefstromite particle outlet；Mixing arrangement, there is sefstromite particle entrance, binding agent entrance, alkali metal salt entrance, fluorite entrance, water inlet and mixed material outlet；Shaped device, there is mixed material entrance and the outlet of mixing pelletizing；Screening plant, there is mixing pelletizing entrance, qualified mixing pelletizing outlet and unqualified mixing pelletizing outlet；Drying and preheating device, there is qualified mixing pelletizing entrance, water out and dry pelletizing outlet；Calciner, have and dry pelletizing entrance, the outlet of unqualified acid pellet and the outlet of qualified acid pellet.There is the advantages of intensity is high, reduction swellability rate is low and reproducibility is high using the vanadium titanyl pellet obtained by the system, the reproducibility of vanadium titanyl pellet improves 2% 10%, and can meet the requirement of shaft kiln directly reduced production.
Description
Technical field
The utility model belongs to metallurgical technology field, specifically, the utility model is related to and prepares vanadium titanyl pellet
System.
Background technology
Schreyerite has high comprehensive utilization value, how to make good use of schreyerite, play as a kind of complex iron ore resource
The sharpest edges of resource, it is always that metallurgical boundary's researcher makes great efforts target to reclaim ferrovanadium titanium comprehensively.Traditional blast furnace process and
External non-blast furnace process smelts schreyerite, has only reclaimed iron and vanadium, and titanium enters blast furnace slag, because titanium grade is too low temporarily without economy
Rational recovery value, cause a large amount of losses of titanium resource.
Chinese Patent Application No. 201310653098.6 discloses a kind of shaft furnace vanadium titano-magnetite acid pellet roasting work
Skill, the utility model provide a kind of shaft furnace vanadium titano-magnetite acid pellet roasting technique, by vanadium titano-magnetite fine grinding granulating
Spend below 200 mesh and account for more than 70% ore particle, then dry；10wt%-15wt% organic binder bonds are added, are made after mixing
Ball；Green-ball is subjected to oxidizing roasting, cooling obtains acid pellet.The technical disadvantages：Organic binder bond raw material sources are in oil
Product and other industrial or agricultural chemicals, during pelletizing oxidizing roasting, VOC values are high, produce a large amount of pernicious gases, pollute environment.
University of Science ＆ Technology, Beijing takes in week has delivered paper surely《The chemical kinetics research of Iron Oxides Containing Alkali reduction》, and
Ferriferous oxide reduction reaction chemical dynamics process has been derived, has calculated reaction activity and the order of reaction.Alkali metal containing iron oxygen
Compound activation energy reduces by 20% or so than pure iron oxidizing thing, about 1 grade of reaction.Because alkali metal is to cause crystal different
It is normally opened split with iron one of the main divisions of the male role in traditional opera it is long an important factor for, therefore Iron Oxides Containing Alkali reduction swellability rate is high, and low intensity can not meet to erect
Stove direct-reduction technique productions requirement.
Panzhihua new technological process experiment group Zhang Ruoping has delivered entitled " vanadium titano-magnetite sodium method new technology in steel vanadium titanium
Technical progress and technology assessment ", the technique will after the sodium pelletizing oxidizing roasting that produced soak vanadium then enter rotary kiln directly also
Original carries out lower step process processing.Match somebody with somebody 6wt% saltcake, batch mixing pelletizing outside pelletizing, drying grate drying temperature is 150-250 degrees Celsius,
Preheating temperature is 800-900 degrees Celsius, time 30-60min, and rotary kiln oxidizing roasting temperature is 1250-1280 degrees Celsius, oxidation
After roasting time 30-60min, pelletizing enters rotary kiln for directly reducing after tank group water logging, obtains metallized pellet.The shortcomings that this method
It is：Sulfur dioxide pernicious gas is also easy to produce when being calcined with sodium sulphate, environment is polluted；And the high pellet strength of sodium salt dosage and
Reduction swellability rate index can not meet the requirement of shaft kiln directly reduced production；The simultaneous oxidation time is grown, pelletizing production high energy consumption.
Therefore, the existing technology for preparing vanadium titanyl pellet is further improved.
Utility model content
The utility model is intended to one of technical problem at least solving in correlation technique to a certain extent.Therefore, this reality
It is to propose a kind of system for preparing vanadium titanyl pellet with a new purpose.Using the vanadium titanyl ball obtained by the system
Group has the advantages of intensity is high, reduction swellability rate is low and reproducibility is high, and the reproducibility of vanadium titanyl pellet improves 2%-10%,
And the requirement of shaft kiln directly reduced production can be met.
In a utility model of the present utility model, the utility model proposes it is a kind of prepare vanadium titanyl pellet be
System, according to embodiment of the present utility model, the system includes：
Pretreatment unit, the pretreatment unit have sefstromite entrance, water out and sefstromite particle outlet；
Mixing arrangement, the mixing arrangement have sefstromite particle entrance, binding agent entrance, alkali metal salt entrance, firefly
Stone entrance, water inlet and mixed material outlet, the sefstromite particle entrance are connected with the sefstromite particle outlet；
Shaped device, the shaped device have mixed material entrance and the outlet of mixing pelletizing, the mixed material entrance
It is connected with mixed material outlet；
Screening plant, the screening plant have mixing pelletizing entrance, qualified mixing pelletizing outlet and unqualified mixing ball
Group outlet, the mixing pelletizing entrance are connected with the pelletizing outlet that mixes, and the unqualified mixing pelletizing outlet mixes with described
Attach together put it is connected；
Drying and preheating device, the drying and preheating device have qualified mixing pelletizing entrance, water out and dry pelletizing
Mouthful, the qualified mixing pelletizing entrance is connected with the qualified mixing pelletizing outlet；
Calciner, the calciner, which has, dries pelletizing entrance, the outlet of unqualified acid pellet and qualified oxidation ball
Group outlet, the dry pelletizing entrance are connected with the dry pelletizing outlet, the unqualified acid pellet outlet and described mix
Attach together put it is connected.
Thus, it is pre- by the way that sefstromite is sent into according to the system for preparing vanadium titanyl pellet of the utility model embodiment
Processing unit is pre-processed, and is advantageous to remove the crystallization water and Free water in sefstromite, and it is smaller to obtain particle diameter
Sefstromite particle, be advantageous to improve the specific surface area of sefstromite, so as to improve follow-up sefstromite particle in mixed material
And the contact area in molding materials with other materials in mixed material and molding materials；In mixing arrangement, sefstromite
Particle is mixed with alkali metal salt, binding agent, fluorite and water, treat sefstromite particle and alkali metal salt, binding agent, fluorite and
After water is well mixed, mixed material is obtained, and the mixed material is delivered into shaped device and carries out forming processes, obtains mixing ball
Group, in this way, the contact area of sefstromite particle and alkali metal salt, binding agent, fluorite and water can be dramatically increased, so as to be advantageous to
Increase the treatment effeciency of follow-up calciner；Mixing pelletizing after shaping continues to be fed into screening plant and sieved, by particle diameter
Undesirable unqualified mixing pelletizing screens out, and the satisfactory qualified mixing pelletizing of particle diameter is obtained, in this way, being advantageous to
Improve the yield of qualified acid pellet in follow-up calciner；Then qualified mixing pelletizing is sent into drying and preheating device to be done
Dry processing, the excessive moisture in qualified mixing pelletizing is removed, obtains drying pelletizing；Pelletizing will finally be dried and be sent into calciner
Calcination process is carried out, because being calcined the pelletizing particle diameter of gained and the compression strength of pelletizing into positive correlation, so can be according to roasting gained
Pelletizing particle diameter, will be calcined gained pelletizing be divided into qualified acid pellet and unqualified acid pellet.Thus, using the system
The vanadium titanyl pellet of gained has the advantages of intensity is high, reduction swellability rate is low and reproducibility is high, the reduction of vanadium titanyl pellet
Property improves 2%-10%, and can meet the requirement of shaft kiln directly reduced production.
In addition, according to the system for preparing vanadium titanyl pellet of the utility model above-described embodiment, can also have as follows
Additional technical characteristic：
It is optional, dryer section that the drying and preheating device includes being sequentially connected, the first preheating section, the second preheating section and the
Three preheating sections.Thus, be advantageous to improve the grade of the vanadium titanyl pellet of follow-up gained.
Optional, the calciner includes the first furnace zone and the second furnace zone being sequentially connected.Thus, can be further
Improve the grade of the vanadium titanyl pellet of follow-up gained.
Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Of the present utility model above-mentioned and/or additional aspect and advantage will in the description from combination accompanying drawings below to embodiment
Become obvious and be readily appreciated that, wherein：
Fig. 1 is the system structure diagram for preparing vanadium titanyl pellet according to the utility model one embodiment；
Fig. 2 is to prepare vanadium titanyl according to the system implementation for preparing vanadium titanyl pellet of the utility model further embodiment
The method flow schematic diagram of pellet；
Fig. 3 is the system structure diagram for preparing vanadium titanyl pellet according to another embodiment of the utility model.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two
It is individual, three etc., unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be
Mechanically connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, limited unless otherwise clear and definite.For the common skill of this area
For art personnel, concrete meaning of the above-mentioned term in the utility model can be understood as the case may be.
In one side of the present utility model, the utility model proposes a kind of system for preparing vanadium titanyl pellet.Root
According to embodiment of the present utility model, with reference to figure 1, the system includes：Pretreatment unit 100, mixing arrangement 200, shaped device
300th, screening plant 400, drying and preheating device 500 and calciner 600.
According to embodiment of the present utility model, pretreatment unit 100 has sefstromite entrance 101, water out 102 and vanadium
Ilmenite particle outlet 103, and suitable for sefstromite is pre-processed, to remove the crystallization water and Free water, obtain vanadium titanium
Iron ores particle.Inventor has found, by the way that sefstromite feeding pretreatment unit is pre-processed, is advantageous to remove sefstromite
In the crystallization water and Free water, and the smaller sefstromite particle of particle diameter can be obtained, be advantageous to improve the ratio table of sefstromite
Area, so as to improve follow-up sefstromite particle in mixed material and molding materials with its in mixed material and molding materials
The contact area of his material.Specifically, pretreatment unit can include the fine grinding device and drying unit being sequentially connected.
According to one embodiment of the present utility model, the particle diameter of sefstromite particle is not particularly restricted, this area skill
Art personnel can be selected according to being actually needed, according to a specific embodiment of the present utility model, sefstromite particle
Particle diameter can be the accounting 50%-80% that granularity is not more than 200 mesh.Inventor find, sefstromite particle it is excessive or it is too small all
The sefstromite particle that pelletizing balling property can be caused poor and meticulous causes pelletizing internal voids rate low, influences inside pelletizing
Heat transfer and metallurgical performance.Thus, the reproducibility of follow-up pelletizing can be significantly improved using the sefstromite particle of the application scope.
According to embodiment of the present utility model, mixing arrangement 200 has sefstromite particle entrance 201, binding agent entrance
202nd, alkali metal salt entrance 203, fluorite entrance 204, water inlet 205 and mixed material outlet 206, sefstromite particle entrance
201 are connected with sefstromite particle outlet 103, and suitable for sefstromite particle, binding agent, alkali metal salt, fluorite and water are entered
Row mixed processing, to obtain mixed material.Thus, sefstromite particle and binding agent, alkali metal salt, fluorite and water are advantageous to
It is well mixed, so as to increase the contact area of sefstromite particle and binding agent, alkali metal salt, fluorite and water, be advantageous to improve
The treatment effeciency of follow-up calciner.
According to one embodiment of the present utility model, the particle diameter of fluorite is not particularly restricted, and those skilled in the art can
It is actually needed and is selected with basis, according to a specific embodiment of the present utility model, the particle diameter of fluorite can be 74~180
Micron.Inventor has found, other uniformity coefficients for improving batch mixing can be significantly better than using the fluorite to particle size range, so as to carry
The reproducibility of high follow-up pelletizing.
According to further embodiment of the present utility model, sefstromite particle and binding agent, alkali metal salt, fluorite and water
Mixed weight ratio is not particularly restricted, and those skilled in the art can be selected according to being actually needed, new according to this practicality
One specific embodiment of type, the mixed weight ratio of sefstromite particle and binding agent, alkali metal salt, fluorite and water can be
100：(0.5~1.5)：(0.5~2)：(0.5~1.5)：(5~10).Inventor has found, can be significantly excellent under the mixing match
The reproducibility of follow-up pelletizing is improved while other proportionings are reducing energy consumption.
According to another embodiment of the present utility model, the type of alkali metal salt is not particularly restricted, art technology
Personnel can be selected according to being actually needed, and according to a specific embodiment of the present utility model, alkali metal salt can be choosing
From at least one of sodium carbonate, potassium carbonate, potassium nitrate, sodium nitrate, sodium fluoride, potassium fluoride, potassium chloride and sodium chloride.Inventor
It was found that after adding alkali metal salt in pelletizing, cause pelletizing distortion of lattice, while alkali metal escapes gas in pellet roasting procedure decomposition
Body, pelletizing porosity is improved, improve pelletizing reproducibility.
According to embodiment of the present utility model, shaped device 300 has mixed material entrance 301 and the outlet of mixing pelletizing
302, mixed material entrance 301 is connected with mixed material outlet 206, and suitable for mixed material is carried out into forming processes, so as to
To mixing pelletizing.Thus, be advantageous to sefstromite particle in mixed material fully to connect with binding agent, alkali metal salt, fluorite and water
Touch, further improve the treatment effeciency of follow-up calciner.It should be noted that those skilled in the art can be according to actual need
The particle diameter of gained mixing pelletizing is selected.
According to embodiment of the present utility model, there is screening plant 400 mixing pelletizing entrance 401, qualified mixing pelletizing to go out
Mouth 402 and unqualified mixing pelletizing outlet 403, mixing pelletizing entrance 401 export 302 with mixing pelletizing and are connected, unqualified mixing
Pelletizing outlet 403 is connected with mixing arrangement 200, and suitable for mixing pelletizing is carried out into screening process, to obtain unqualified mixing
Pelletizing and qualified mixing pelletizing, and unqualified mixing pelletizing is back to above-mentioned mixing arrangement.Inventor has found, after being molded
Mixing pelletizing continues to be fed into screening plant and sieved, and the undesirable unqualified mixing pelletizing of particle diameter is screened out, obtained
To the satisfactory qualified mixing pelletizing of particle diameter, in this way, being advantageous to improve the yield of qualified acid pellet in follow-up calciner.
It should be noted that the particle diameter of qualified mixing pelletizing is 8~15mm, and particle diameter is less than 8mm or referred to as unqualified higher than 15mm
Mix pelletizing.
According to embodiment of the present utility model, drying and preheating device 500 has qualified mixing pelletizing entrance 501, water out
502 export 503 with pelletizing is dried, and qualified mixing pelletizing entrance 501 exports 402 with qualified mixing pelletizing and is connected, and suitable for that will close
The pre-heat treatment is dried in lattice mixing pelletizing, to obtain water and to dry pelletizing.Thus, be advantageous to remove in qualified mixing pelletizing
Water, improve the grade of follow-up gained vanadium titanyl pellet.
According to one embodiment of the present utility model, drying and preheating device is not particularly restricted, those skilled in the art
It can be selected according to being actually needed, according to a specific embodiment of the present utility model, drying and preheating device can include
Dryer section, the first preheating section, the second preheating section and the 3rd preheating section being sequentially connected.
According to further embodiment of the present utility model, the treatment conditions of dryer section are not particularly restricted, this area skill
Art personnel can be selected according to being actually needed, according to a specific embodiment of the present utility model, the processing temperature of dryer section
Degree can be not more than 200 degrees Celsius, and the time can be 10~25min.Imitated thus, it is possible to significantly improve drying for dry pelletizing
Rate.
According to another embodiment of the present utility model, the treatment conditions of the first preheating section are not particularly restricted, ability
Field technique personnel can be selected according to being actually needed, according to a specific embodiment of the present utility model, at the first preheating
The temperature of reason can be 200~450 degrees Celsius, and the time can be 5~10min.
According to another embodiment of the present utility model, the treatment conditions of the second preheating section are not particularly restricted, ability
Field technique personnel can be selected according to being actually needed, according to a specific embodiment of the present utility model, at the second preheating
The temperature of reason can be 450~700 degrees Celsius, and the time can be 4~8min.
According to another embodiment of the present utility model, the treatment conditions of the 3rd preheating section are not particularly restricted, ability
Field technique personnel can be selected according to being actually needed, according to a specific embodiment of the present utility model, at the 3rd preheating
The temperature of reason can be 700~900 degrees Celsius, and the time can be 10~15min.
According to embodiment of the present utility model, calciner 600, which has, dries pelletizing entrance 601, unqualified acid pellet
Outlet 602 and qualified acid pellet outlet 603, dry pelletizing entrance 601 and be connected with drying pelletizing outlet 503, unqualified oxidation
Pelletizing outlet 602 is connected with mixing arrangement 200, and carries out oxidation processes suitable for that will dry pelletizing, to obtain unqualified oxidation
Pelletizing and qualified acid pellet, and unqualified acid pellet is back to above-mentioned mixing arrangement.Inventor has found, will dry pelletizing
It is sent into calciner and carries out calcination process, because being calcined the pelletizing particle diameter of gained and the compression strength of pelletizing into positive correlation, so can
According to the particle diameter of the pelletizing of roasting gained, the pelletizing for being calcined gained is divided into qualified acid pellet and unqualified acid pellet.Tool
Body, it will be less than the i.e. unqualified acid pellet return of 8mm pelletizings by screening plant after pelletizing cooling after roasting and recycle,
It is that lower step production is taken out or carried out to qualified acid pellet more than 8mm pelletizings.
According to one embodiment of the present utility model, calciner is not particularly restricted, and those skilled in the art can
It is actually needed and is selected with basis, according to a specific embodiment of the present utility model, calciner can includes phase successively
The first furnace zone and the second furnace zone even.
According to further embodiment of the present utility model, the condition of the first oxidizing roasting processing is not particularly restricted, this
The technical staff in field can be selected according to being actually needed, according to a specific embodiment of the present utility model, the first oxygen
The temperature for changing calcination process can be 900-1300 degrees Celsius, and the time can be 8-17min.
According to another embodiment of the present utility model, the condition of the second oxidizing roasting processing is not particularly restricted, this
The technical staff in field can be selected according to being actually needed, according to a specific embodiment of the present utility model, the second oxygen
The temperature for changing calcination process can be 1200-1300 degrees Celsius, and the time can be 3-8min.
Pre-processed according to the system for preparing vanadium titanyl pellet of the utility model embodiment by the way that sefstromite is sent into
Unit is pre-processed, and is advantageous to remove the crystallization water and Free water in sefstromite, and can obtain the smaller vanadium titanium of particle diameter
Iron ores particle, be advantageous to improve sefstromite specific surface area, so as to improve follow-up sefstromite particle mixed material and into
In type material with the contact area of other materials in mixed material and molding materials；In mixing arrangement, sefstromite particle
Mixed with alkali metal salt, binding agent, fluorite and water, treat that sefstromite particle mixes with alkali metal salt, binding agent, fluorite and water
After closing uniformly, mixed material is obtained, and the mixed material is delivered into shaped device and carries out forming processes, obtains mixing pelletizing, such as
This, can dramatically increase the contact area of sefstromite particle and alkali metal salt, binding agent, fluorite and water, so as to be advantageous to increase
The treatment effeciency of follow-up calciner；Mixing pelletizing after shaping continues to be fed into screening plant and sieved, and particle diameter is not inconsistent
Close desired unqualified mixing pelletizing and screen out, the satisfactory qualified mixing pelletizing of particle diameter is obtained, in this way, being advantageous to improve
The yield of qualified acid pellet in follow-up calciner；Then qualified mixing pelletizing is sent into drying and preheating device and place is dried
Reason, the excessive moisture in qualified mixing pelletizing is removed, obtains drying pelletizing；Pelletizing will finally be dried and be sent into calciner progress
Calcination process, because being calcined the pelletizing particle diameter of gained and the compression strength of pelletizing into positive correlation, so can be according to the ball of roasting gained
The particle diameter of group, the pelletizing for being calcined gained is divided into qualified acid pellet and unqualified acid pellet.Thus, using obtained by the system
Vanadium titanyl pellet there is the advantages of intensity is high, reduction swellability rate is low and reproducibility is high, the reproducibility of vanadium titanyl pellet carries
High 2%-10%, and the requirement of shaft kiln directly reduced production can be met.
In order to facilitate understanding, below to preparing vanadium titanyl pellet using the above-mentioned system implementation for preparing vanadium titanyl pellet
Method be described in detail.According to embodiment of the present utility model, with reference to figure 2, this method includes：
S100：Sefstromite is supplied and pre-processed into pretreatment unit
In the step, sefstromite is supplied and pre-processed into pretreatment unit, to remove the crystallization water and freedom
Water, obtain sefstromite particle.Inventor has found, by the way that sefstromite feeding pretreatment unit is pre-processed, is advantageous to
The crystallization water and Free water in sefstromite are removed, and the smaller sefstromite particle of particle diameter can be obtained, is advantageous to improve vanadium
The specific surface area of ilmenite, so as to improve follow-up sefstromite particle in mixed material and molding materials with mixed material and into
The contact area of other materials in type material.It should be noted that pretreatment unit can be fine grinding and drying.
According to one embodiment of the present utility model, the particle diameter of sefstromite particle is not particularly restricted, this area skill
Art personnel can be selected according to being actually needed, according to a specific embodiment of the present utility model, sefstromite particle
Particle diameter can be the accounting 50%-80% that granularity is not more than 200 mesh.Inventor find, sefstromite particle it is excessive or it is too small all
The sefstromite particle that pelletizing balling property can be caused poor and meticulous causes pelletizing internal voids rate low, influences inside pelletizing
Heat transfer and metallurgical performance.Thus, the reproducibility of follow-up pelletizing can be significantly improved using the sefstromite particle of the application scope.
S200：Sefstromite particle, binding agent, alkali metal salt, fluorite and water are supplied and mixed into mixing arrangement
Processing
In the step, sefstromite particle, binding agent, alkali metal salt, fluorite and water are supplied into mixing arrangement and carried out
Mixed processing, to obtain mixed material.Thus, be advantageous to sefstromite particle to mix with binding agent, alkali metal salt, fluorite and water
Close uniformly, so as to increase the contact area of sefstromite particle and binding agent, alkali metal salt, fluorite and water, after being advantageous to raising
The treatment effeciency of continuous calciner.
According to one embodiment of the present utility model, the particle diameter of fluorite is not particularly restricted, and those skilled in the art can
It is actually needed and is selected with basis, according to a specific embodiment of the present utility model, the particle diameter of fluorite can be 74~180
Micron.Inventor has found, other uniformity coefficients for improving batch mixing can be significantly better than using the fluorite to particle size range, so as to carry
The reproducibility of high follow-up pelletizing.
According to further embodiment of the present utility model, sefstromite particle and binding agent, alkali metal salt, fluorite and water
Mixed weight ratio is not particularly restricted, and those skilled in the art can be selected according to being actually needed, new according to this practicality
One specific embodiment of type, the mixed weight ratio of sefstromite particle and binding agent, alkali metal salt, fluorite and water can be
100：(0.5~1.5)：(0.5~2)：(0.5~1.5)：(5~10).Inventor has found, can be significantly excellent under the mixing match
The reproducibility of follow-up pelletizing is improved while other proportionings are reducing energy consumption.
According to another embodiment of the present utility model, the type of alkali metal salt is not particularly restricted, art technology
Personnel can be selected according to being actually needed, and according to a specific embodiment of the present utility model, alkali metal salt can be choosing
From at least one of sodium carbonate, potassium carbonate, potassium nitrate, sodium nitrate, sodium fluoride, potassium fluoride, potassium chloride and sodium chloride.Inventor
It was found that after adding alkali metal salt in pelletizing, cause pelletizing distortion of lattice, while alkali metal escapes gas in pellet roasting procedure decomposition
Body, pelletizing porosity is improved, improve pelletizing reproducibility.
S300：Mixed material is supplied into shaped device and carries out forming processes
In the step, mixed material is supplied into shaped device and carries out forming processes, to obtain mixing pelletizing.By
This, is advantageous to sefstromite particle in mixed material and is fully contacted with binding agent, alkali metal salt, fluorite and water, further improves
The treatment effeciency of follow-up calciner.
S400：Mixing pelletizing is supplied into screening plant and carries out screening process
In the step, mixing pelletizing is supplied into screening plant and carries out screening process, to obtain unqualified mixing ball
Group and qualified mixing pelletizing, and unqualified mixing pelletizing is back to mixing arrangement in S200.Inventor has found, after shaping
Mixing pelletizing continue to be fed into screening plant and sieved, the undesirable unqualified mixing pelletizing of particle diameter is screened out,
The satisfactory qualified mixing pelletizing of particle diameter is obtained, in this way, being advantageous to improve the production of qualified acid pellet in follow-up calciner
Amount.It should be noted that the particle diameter of qualified mixing pelletizing is 8~15mm, and particle diameter does not conform to referred to as less than 8mm or higher than 15mm
Lattice mixing pelletizing.
S500：Qualified mixing pelletizing is supplied to drying and preheating device the pre-heat treatment is dried
In the step, qualified mixing pelletizing is supplied to drying and preheating device the pre-heat treatment is dried, to obtain water
With dry pelletizing.Thus, be advantageous to remove the water in qualified mixing pelletizing, improve the grade of follow-up gained vanadium titanyl pellet.
According to one embodiment of the present utility model, drying and preheating processing is not particularly restricted, those skilled in the art
It can be selected according to being actually needed, according to a specific embodiment of the present utility model, drying and preheating processing can be successively
Including drying process, the first the pre-heat treatment, the second the pre-heat treatment and the 3rd the pre-heat treatment.
According to further embodiment of the present utility model, the condition of drying process is not particularly restricted, art technology
Personnel can be selected according to being actually needed, and according to a specific embodiment of the present utility model, the temperature of drying process can
So that no more than 200 degrees Celsius, the time can be 10~25min.
According to another embodiment of the present utility model, the condition of the first the pre-heat treatment is not particularly restricted, this area
Technical staff can be selected according to being actually needed, according to a specific embodiment of the present utility model, the first the pre-heat treatment
Temperature can be 200~450 degrees Celsius, the time can be 5~10min.
According to another embodiment of the present utility model, the condition of the second the pre-heat treatment is not particularly restricted, this area
Technical staff can be selected according to being actually needed, according to a specific embodiment of the present utility model, the second the pre-heat treatment
Temperature can be 450~700 degrees Celsius, the time can be 4~8min.
According to another embodiment of the present utility model, the condition of the 3rd the pre-heat treatment is not particularly restricted, this area
Technical staff can be selected according to being actually needed, according to a specific embodiment of the present utility model, the 3rd the pre-heat treatment
Temperature can be 700~900 degrees Celsius, the time can be 10~15min.
S600：Dry pelletizing is supplied into calciner and carries out oxidation processes
In the step, dry pelletizing is supplied into calciner and carries out oxidation processes, to obtain unqualified oxidation ball
Group and qualified acid pellet, and unqualified acid pellet is back to the mixing arrangement in S200.Inventor has found, by dry ball
Group is sent into calciner and carries out calcination process, because being calcined the pelletizing particle diameter of gained and the compression strength of pelletizing into positive correlation, so
The pelletizing for being calcined gained can be divided into by qualified acid pellet and unqualified acid pellet according to the particle diameter of the pelletizing of roasting gained.
Specifically, it will be less than the i.e. unqualified acid pellet of 8mm pelletizings by screening plant after pelletizing cooling after roasting and return circulation profit
With being that lower step production is taken out or carried out to qualified acid pellet more than 8mm pelletizings.
According to one embodiment of the present utility model, calcination process is not particularly restricted, and those skilled in the art can
To be selected according to being actually needed, according to a specific embodiment of the present utility model, calcination process can include the successively
One oxidizing roasting handles and the second oxidizing roasting processing.
According to further embodiment of the present utility model, the condition of the first oxidizing roasting processing is not particularly restricted, this
The technical staff in field can be selected according to being actually needed, according to a specific embodiment of the present utility model, the first oxygen
The temperature for changing calcination process can be 900-1300 degrees Celsius, and the time can be 8-17min.
According to another embodiment of the present utility model, the condition of the second oxidizing roasting processing is not particularly restricted, this
The technical staff in field can be selected according to being actually needed, according to a specific embodiment of the present utility model, the second oxygen
The temperature for changing calcination process can be 1200-1300 degrees Celsius, and the time can be 3-8min.
The side of vanadium titanyl pellet is prepared according to the system implementation for preparing vanadium titanyl pellet of the utility model embodiment
Method is advantageous to remove the crystallization water and freedom in sefstromite by the way that sefstromite feeding pretreatment unit is pre-processed
Water, and the smaller sefstromite particle of particle diameter can be obtained, be advantageous to improve the specific surface area of sefstromite, it is follow-up so as to improve
Contact area of the sefstromite particle in mixed material and molding materials with other materials in mixed material and molding materials；
In mixing arrangement, sefstromite particle is mixed with alkali metal salt, binding agent, fluorite and water, treat sefstromite particle with
After alkali metal salt, binding agent, fluorite and water are well mixed, mixed material is obtained, and the mixed material is delivered into shaped device and entered
Row forming processes, obtain mixing pelletizing, in this way, sefstromite particle and alkali metal salt, binding agent, fluorite and water can be dramatically increased
Contact area, so as to be advantageous to increase the treatment effeciency of follow-up calciner；Mixing pelletizing after shaping continues to be fed into sieve
Separating device is sieved, and the undesirable unqualified mixing pelletizing of particle diameter is screened out, obtains the satisfactory conjunction of particle diameter
Lattice mixing pelletizing, in this way, being advantageous to improve the yield of qualified acid pellet in follow-up calciner；Then by qualified mixing pelletizing
It is sent into drying and preheating device and processing is dried, the excessive moisture in qualified mixing pelletizing is removed, obtains drying pelletizing；Finally
Pelletizing will be dried and be sent into calciner progress calcination process, because being calcined the pelletizing particle diameter of gained and the compression strength of pelletizing into positive
Close, so the pelletizing for being calcined gained can be divided into qualified acid pellet and unqualified oxygen according to the particle diameter of the pelletizing of roasting gained
Pellet.Thus, it is excellent using the vanadium titanyl pellet obtained by this method has that intensity is high, reduction swellability rate is low and reproducibility is high
Point, the reproducibility of vanadium titanyl pellet improves 2%-10%, and can meet the requirement of shaft kiln directly reduced production.
Below with reference to specific embodiment, the utility model is described, it is necessary to which explanation is, these embodiments are only
Descriptive, without limiting the utility model in any way.
Embodiment 1
Sefstromite is subjected to fine grinding and drying, the crystallization water and Free water in sefstromite is removed, it is little to obtain granularity
In the accounting 50%-80% of 200 mesh sefstromite particle, by the sefstromite particle and binding agent, sodium carbonate, fluorite and
Water is according to weight than 100：1：1：1.5：7 are mixed, and wherein the particle diameter of fluorite is 74~180 μm, after being well mixed, is mixed
Compound material, and the mixed material is delivered in shaped device successively and carries out forming processes and screening plant progress screening process, obtain
To the qualified mixing pelletizing that particle diameter is 8~15mm, and particle diameter is less than the unqualified mixing pelletizing of 8mm and particle diameter more than 15mm and returned
Be back in above-mentioned mixing arrangement, the qualified mixing pelletizing of gained successively by drying process, the first the pre-heat treatment, the second preheating at
Reason and the 3rd the pre-heat treatment, obtain drying pelletizing, wherein the temperature of drying process be that the time is 10 no more than 200 degrees Celsius~
25min, the temperature of the first the pre-heat treatment is 200~450 degrees Celsius, and the time is 5~10min, and the temperature of the second the pre-heat treatment is
450~700 degrees Celsius, the time is 4~8min, and the temperature of the 3rd the pre-heat treatment is 700~900 degrees Celsius, the time is 10~
15min.Finally the drying pelletizing of gained is handled by the first oxidizing roasting processing and the second oxidizing roasting successively, respectively obtained
Qualified acid pellet is vanadium titanyl pellet and unqualified acid pellet, and above-mentioned unqualified acid pellet is back into above-mentioned mix
Attach together in putting, wherein the temperature of the first oxidizing roasting processing is 900-1300 degrees Celsius, time 8-17min, the second oxidation roasting
The temperature for burning processing is 1200-1300 degrees Celsius, time 3-8min.
Detected through instrument for testing compressive strength, the qualified acid pellet of gained is the resistance to compression of vanadium titanyl pellet as stated above
Intensity is 3178N/, and the porosity of pelletizing is 23%, and the reduction swellability rate of pelletizing is 6.8%, the low temperature reduction degradation of pelletizing
Rate is that accounting of the particle diameter more than 6.3mm is more than 92%, and accounting of the particle diameter less than 3.2mm is less than 8%, and the reproducibility of pelletizing improves
5%, the quality of pelletizing meets shaft furnace production requirement.
Embodiment 2
Sefstromite is subjected to fine grinding and drying, the crystallization water and Free water in sefstromite is removed, it is little to obtain granularity
In the accounting 50%-80% of 200 mesh sefstromite particle, by the sefstromite particle and binding agent, potassium carbonate, fluorite and
Water is according to weight than 100：0.8：1.5：1.2：6 are mixed, the production returning charge containing 1wt% wherein in sefstromite particle
(unqualified mixing pelletizing and unqualified acid pellet), the particle diameter of fluorite is 74~180 μm, after being well mixed, obtains mixture
Material, and the mixed material is delivered in shaped device successively and carries out forming processes and screening plant progress screening process, obtain grain
Footpath is 8~15mm qualified mixing pelletizing, and particle diameter is less than into the unqualified mixing pelletizing of 8mm and particle diameter more than 15mm and is back to
In above-mentioned mixing arrangement, the qualified mixing pelletizing of gained successively by drying process, the first the pre-heat treatment, the second the pre-heat treatment and
3rd the pre-heat treatment, obtains drying pelletizing, wherein the temperature of drying process be that the time is 10 no more than 200 degrees Celsius~
25min, the temperature of the first the pre-heat treatment is 200~450 degrees Celsius, and the time is 5~10min, and the temperature of the second the pre-heat treatment is
450~700 degrees Celsius, the time is 4~8min, and the temperature of the 3rd the pre-heat treatment is 700~900 degrees Celsius, the time is 10~
15min.Finally the drying pelletizing of gained is handled by the first oxidizing roasting processing and the second oxidizing roasting successively, respectively obtained
Qualified acid pellet is vanadium titanyl pellet and unqualified acid pellet, and above-mentioned unqualified acid pellet is back into above-mentioned mix
Attach together in putting, wherein the temperature of the first oxidizing roasting processing is 900-1300 degrees Celsius, time 8-17min, the second oxidation roasting
The temperature for burning processing is 1200-1300 degrees Celsius, time 3-8min.
Detected through instrument for testing compressive strength, the qualified acid pellet of gained is the resistance to compression of vanadium titanyl pellet as stated above
Intensity is 2860N/, and the porosity of pelletizing is 25%, and the reduction swellability rate of pelletizing is 9.6%, the low temperature reduction degradation of pelletizing
Rate is the accounting 91% more than 6.3mm, and particle diameter is less than 3.2mm accounting 8%, and the reproducibility of pelletizing improves 6.5%, the matter of pelletizing
Amount meets shaft furnace production requirement.
Embodiment 3
Sefstromite is subjected to fine grinding and drying, the crystallization water and Free water in sefstromite is removed, it is little to obtain granularity
In the accounting 50%-80% of 200 mesh sefstromite particle, by the sefstromite particle and binding agent, sodium nitrate, fluorite and
Water is according to weight than 100：0.8：2：0.5：6 are mixed, and the production returning charge containing 2wt% is (no wherein in sefstromite particle
Qualified mixing pelletizing and unqualified acid pellet), the particle diameter of fluorite is 74~180 μm, after being well mixed, obtains mixed material,
And the mixed material is delivered in shaped device successively and carries out forming processes and screening plant progress screening process, obtaining particle diameter is
8~15mm qualified mixing pelletizing, and by particle diameter be less than the unqualified mixing pelletizing of 8mm and particle diameter more than 15mm be back to it is above-mentioned
In mixing arrangement, the qualified mixing pelletizing of gained is successively by drying process, the first the pre-heat treatment, the second the pre-heat treatment and the 3rd
The pre-heat treatment, obtaining drying pelletizing, the wherein temperature of drying process is that the time is 10~25min no more than 200 degrees Celsius, the
The temperature of one the pre-heat treatment is 200~450 degrees Celsius, and the time is 5~10min, and the temperature of the second the pre-heat treatment is 450~700
Degree Celsius, the time is 4~8min, and the temperature of the 3rd the pre-heat treatment is 700~900 degrees Celsius, and the time is 10~15min.Finally
By the drying pelletizing of gained successively by the first oxidizing roasting processing and the second oxidizing roasting processing, qualified oxidation ball is respectively obtained
Group is vanadium titanyl pellet and unqualified acid pellet, and above-mentioned unqualified acid pellet is back in above-mentioned mixing arrangement,
The temperature of wherein the first oxidizing roasting processing is 900-1300 degrees Celsius, time 8-17min, the temperature of the second oxidizing roasting processing
Spend for 1200-1300 degrees Celsius, time 3-8min.
Detected through instrument for testing compressive strength, the qualified acid pellet of gained is the resistance to compression of vanadium titanyl pellet as stated above
Intensity is 2690N/, and the porosity of pelletizing is 29%, and the reduction swellability rate of pelletizing is 11.02%, the low-temperature reduction powder of pelletizing
Rate is the accounting 86% more than 6.3mm, and particle diameter is less than 3.2mm accounting 14%, and the reproducibility of pelletizing improves 8.2%, pelletizing
Quality meet shaft furnace production requirement.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present utility model.In this manual, to the schematic table of above-mentioned term
State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff the different embodiments or example and the feature of different embodiments or example described in this specification can be entered
Row combines and combination.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in the scope of the utility model
It is interior above-described embodiment to be changed, changed, replaced and modification.
Claims (3)
- A kind of 1. system for preparing vanadium titanyl pellet, it is characterised in that including：Pretreatment unit, the pretreatment unit have sefstromite entrance, water out and sefstromite particle outlet；There is sefstromite particle entrance, binding agent entrance, alkali metal salt entrance, fluorite to enter for mixing arrangement, the mixing arrangement Mouth, water inlet and mixed material outlet, the sefstromite particle entrance are connected with the sefstromite particle outlet；Shaped device, the shaped device have mixed material entrance and the outlet of mixing pelletizing, the mixed material entrance and institute Mixed material outlet is stated to be connected；There is mixing pelletizing entrance, qualified mixing pelletizing outlet and unqualified mixing pelletizing to go out for screening plant, the screening plant Mouthful, the mixing pelletizing entrance is connected with the mixing pelletizing outlet, and the unqualified mixing pelletizing outlet mixes dress with described Put connected；Drying and preheating device, the drying and preheating device have qualified mixing pelletizing entrance, water out and dry pelletizing outlet, institute Qualified mixing pelletizing entrance is stated with the qualified mixing pelletizing outlet to be connected；There is dry pelletizing entrance, the outlet of unqualified acid pellet and qualified acid pellet to go out for calciner, the calciner Mouthful, the dry pelletizing entrance is connected with the dry pelletizing outlet, and the unqualified acid pellet outlet mixes dress with described Put connected.
- 2. system according to claim 1, it is characterised in that the drying and preheating device includes the drying being sequentially connected Section, the first preheating section, the second preheating section and the 3rd preheating section.
- 3. system according to claim 1, it is characterised in that the calciner includes the first furnace zone being sequentially connected With the second furnace zone.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106834663A (en) * | 2017-03-22 | 2017-06-13 | 江苏省冶金设计院有限公司 | The system and method for preparing vanadium titanyl pellet |
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