CN107881337A - A kind of method that high-chromic vanadium-titanium ferroferrite prepares pellet with addition of ilmenite - Google Patents
A kind of method that high-chromic vanadium-titanium ferroferrite prepares pellet with addition of ilmenite Download PDFInfo
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- CN107881337A CN107881337A CN201711152266.8A CN201711152266A CN107881337A CN 107881337 A CN107881337 A CN 107881337A CN 201711152266 A CN201711152266 A CN 201711152266A CN 107881337 A CN107881337 A CN 107881337A
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- China
- Prior art keywords
- ilmenite
- pelletizing
- chromic vanadium
- titanium ferroferrite
- titanium
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/10—Obtaining titanium, zirconium or hafnium
- C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
Abstract
A kind of method for preparing pellet with addition of ilmenite the present invention relates to high-chromic vanadium-titanium ferroferrite, it comprises the following steps：S1, high-chromic vanadium-titanium ferroferrite, ilmenite and bentonite material are dried, S2, batch mixing, S3, pelletizing, S4, pelletizing are dried, and S5, roasting obtain pellet.The inventive method is raw material using western red lattice high-chromic vanadium-titanium ferroferrite and ilmenite is climbed, prepare the pellet for meeting blast furnace feeding quality standard, the characteristics of giving full play to red lattice high-chromic vanadium-titanium ferroferrite and ilmenite, the pellet of preparation carries good gas permeability in soft melting dropping, and melt-dropping property is preferable, the Fe and Ti rate of recovery is higher simultaneously, can be used as and produce rich-titanium material and raw material containing chromium pig iron.
Description
Technical field
The invention belongs to iron-smelting raw material production technology, and in particular to a kind of high-chromic vanadium-titanium ferroferrite is prepared with addition of ilmenite
The method of pellet.
Background technology
Sichuan's Hongge Deposit belongs to a kind of Gao Ge, high-Ti type V-Ti magnet as the reserved resources of inland steel
Ore deposit, 35.5 hundred million tons of its reserves.Because more than ten kinds of its symbiosis is using element, particularly iron, titanium, vanadium, chromium etc., and it is wherein rich
Rich titanium resource can provide basic original for titaniums such as production titanium slag, titanium sponge, synthetic rutile, titanium white, titanium alloy, titaniums
Material.And titanium is widely used in fields such as Aeronautics and Astronautics, military project, metallurgy, metallurgy, medical treatment, machineries.
The titanium resource of CHINESE REGION is mainly distributed on Pan Xi, Panzhihua and the vanadium titano-magnetite of Chengde area and ilmenite.
But titanium ore resource belongs to more metal associated minerals based on iron resource, according to existing smelting technique, its comprehensive utilization ratio
It is poorly efficient, it is of poor quality as the titanium slag of byproduct in addition to the utilization rate of iron resource is higher, carry that titanium rate is low and most of titanium slag is used for
Low value-added product is produced, the blast furnace titaniferous slag that most of heap is abandoned does not obtain the utilization of high value not only, and waste residue is to environment
Cause serious pollution.
In view of the importance of red lattice high-chromic vanadium-titanium ferroferrite resource, at home and abroad there is no be applied to blast furnace life at present
The technique of production, the technology smelted, particularly ferrotianium ore resources and high-chromic vanadium-titanium ferroferrite are combined and prepares pellet and enters
The utilization of row blast furnace process, while the research to the metallurgical performance of its pellet is still in blank.And ferrotianium ore resources are as state
, production procedure length, process complexity, maintenance of equipment expense height etc. be present in the raw material of interior production titanium.Therefore it is former suitable for titaniferous
The approach of the efficient production rich-titanium material of material needs new thinking, and ilmenite and high-chromic vanadium titanium ore are combined into comprehensive profit
With, it can not only improve the titanium grade of blast furnace titaniferous slag, and production efficiency is also much larger than the Technology Ways of other production rich-titanium materials, because
This, which combines ilmenite and high-chromic vanadium titanium ore, comprehensively utilizes the production efficiency for improving rich-titanium material.
Using prior art prepare climb western red lattice high-chromic vanadium-titanium ferroferrite with addition of ilmenite pellet when, green-ball be present
Of poor quality, balling-up time length, ripe ball low intensity, metallurgical performance is less than mean level.Therefore, high-chromic vanadium-titanium ferroferrite is with addition of titanium
The technical difficulty of iron ore production pellet is larger.
The content of the invention
(1) technical problems to be solved
In order to solve the above mentioned problem of prior art, the present invention provides a kind of high-chromic vanadium-titanium ferroferrite with addition of ilmenite system
The method of standby pellet, the present invention is raw material using western red lattice high-chromic vanadium-titanium ferroferrite and ilmenite is climbed, it is determined that suitable ball
Nodulizing production technology, prepare and meet the pellet of blast furnace feeding quality standard, give full play to red lattice high-chromic vanadium-titanium ferroferrite and
The characteristics of ilmenite, can be as production rich-titanium material and raw material containing chromium pig iron.
(2) technical scheme
In order to achieve the above object, the main technical schemes that the present invention uses include：
A kind of method that high-chromic vanadium-titanium ferroferrite prepares pellet with addition of ilmenite, it comprises the following steps：
S1, raw material drying：High-chromic vanadium-titanium ferroferrite, ilmenite and bentonite are dried, make its moisture be less than etc.
In 1.5%；
S2, batch mixing：By the dried high-chromic vanadium-titanium ferroferrite, ilmenite and the dry-mixed 10~15min of bentonite, it
After spray water, carry out wet mixing；
S3, pelletizing：Raw material after above-mentioned processing is put into the green-ball that a diameter of 10~12.5 mm is prepared in pelletizer；
S4, pelletizing are dried：The green-ball is put into drying box, heated up by 5~10 DEG C/min heating rate, is risen
Temperature at 105~110 DEG C be incubated 2~3h；Afterwards, cooled by 5~10 DEG C/min rate of temperature fall；
S5, roasting：The dried green-ball is calcined, pelletizing is pressed to 10~12 DEG C/min heating rate liter
Temperature is to 800~900 DEG C；Then, 1150~1250 DEG C are warming up to by 4~6 DEG C/min heating rate, are calcined 15~20min；
Afterwards, cooled by 5~8 DEG C/min rate of temperature fall, taken out after being down to 300 DEG C, be made high-chromic vanadium-titanium ferroferrite with addition of
The pellet of ilmenite.
Method as described above, it is preferable that in step sl, the TFe contents in the high-chromic vanadium-titanium ferroferrite are
50%~58%, FeO content are 25%~30%, TiO2Content is 10%~15%, Cr2O3Content is 0.5%~1.2%,
V2O5Content is 0.5%~1.5%, and CaO content is 0.8~1.0%, SiO2Content is 4.6~4.8%, Al2O3Content is 2.7
~2.9%；
TFe contents in the ilmenite are that 30%~40%, FeO contents are 10%~15%, TiO2Content is 45%
~55%, CaO content is 0.5~1.0%, SiO2Content is 5~6%, Al2O3Content is 0.5~1.0%.
Method as described above, it is preferable that accounting of the particle diameter of the high-chromic vanadium-titanium ferroferrite less than 75 μm is 70%
In the range of~75%；
Accounting of the particle diameter of the ilmenite less than 75 μm is in the range of 75%~95%.
Method as described above, it is preferable that in step sl, the temperature of the drying is 104~108 DEG C, drying time
For 3~4.5h.
Method as described above, it is preferable that in step s 2, the dosage of the high-chromic vanadium-titanium ferroferrite is 15~75 weights
Part is measured, the dosage of the ilmenite is 5~25 parts by weight, and the bentonite accounts for high-chromic vanadium-titanium ferroferrite and ilmenite gross mass
1~2%.
Method as described above, it is preferable that the bentonite is calcium-base bentonite, hydrogen-based bentonite or organobentonite.
Method as described above, it is preferable that in step s 2, the water spray is sprinkling spray water, and water consumption accounts for described low
The 6~8.5% of chromic vanadium-titanium ferroferrite and ilmenite gross weight, 10~15min of mixing time of the wet mixing.
Method as described above, it is preferable that before step S3 pelletizings, the raw material after the step S2 wet mixings is placed in 25~
30~35min of stewing material is carried out in 30 DEG C of constant temperature.
Method as described above, it is preferable that in the step S3 pelletizings, prepare green-ball and comprise the following steps：Will with water
The raw material is disperseed, and after granulating, is spread raw material in water spray, when mother bulb diameter reaches 2~3mm, is left epigranular
Mother bulb, continue uniformly to spread raw material in water spray, when reaching 9~10mm to the diameter of pelletizing, stop water spray；According to 1~2min
The uniform spreading in interval, when pelletizing diameter is in the range of 10~12.5mm, stop spreading, pelletizer is rotated further 4~5min
After obtain green-ball, wherein, the rotating speed of the pelletizer is set to 24~33r/min, and inclination angle is set to 44 °~49 °.
Method as described above, it is preferable that the roasting is using horizontal Muffle furnace, pellet roasting stove or high temperature sintering furnace.
The size distribution for the high-chromic vanadium-titanium ferroferrite that the inventive method uses the accounting less than 75 μm 70%~
In the range of 75%, at the same the size distribution of ilmenite in the accounting less than 75 μm in the range of 75%~95%, can allow preparation
Green ball strength reaches optimal.
The inventive method carries out stewing material to raw material after wet mixing, and stewing material carries out constant temperature in the range of 25~30 DEG C of room temperature and boiled in a covered pot over a slow fire
Material, moisture evaporation speed is small, and moisture loss amount is small, and the moisture fluctuation of compound is small, and the intensity of the pelletizing of preparation is effectively ensured.
In the balling stage of the inventive method, pelletizer rotating speed is in the range of 24~33r/min, and inclination angle is in 44 °~49 ° models
In enclosing, balling-up efficiency is optimal, and makes the loss control of compound in minimum zone.
In the pelletizing drying stage of the inventive method, heated up by 5~10 DEG C/min heating rate, be warming up to 105
~110 DEG C, and 2~3h is incubated, after insulation terminates, under the drying system to be cooled by 5~10 DEG C/min rate of temperature fall, do
Dry time shortens, and pelletizing surface is complete, and the compression strength of pelletizing reaches preferable level after drying.
In the firing stage of the inventive method, after being first warming up to 800~900 DEG C by 10~12 DEG C/min heating rate,
1150~1250 DEG C are warming up to by 4~6 DEG C/min heating rate again, roasting time is 15~20min, with other pellet roastings
Technology is compared, and without preheating, sintering temperature is low, and the time is short, can reach the requirement of ripe ball compression strength, and it is maintained at 2542~
In the range of 3248N, the production efficiency of high-chromic vanadium-titanium ferroferrite pelletizing is significantly improved, and saves the energy, reduces cost.
(3) beneficial effect
The beneficial effects of the invention are as follows：
The inventive method is prepared using to climb western red lattice high-chromic vanadium-titanium ferroferrite and ilmenite be raw material and meets blast furnace and enter
The pellet of stove quality standard, the characteristics of giving full play to red lattice high-chromic vanadium-titanium ferroferrite and ilmenite, the pellet of preparation can
As production rich-titanium material and raw material containing chromium pig iron.Wherein, obtained high-chromic vanadium-titanium ferroferrite pelletizing, low-temperature reduction disintegration
Rate RDI+3.15In the range of 92~95%, much larger than 65% required by standard, reduction swellability rate RSI is in 6.5~7.8% models
In enclosing, reduction swellability rate is small；For reproducibility RI in the range of 68~75%, reproducibility is high；Soften start temperature 1155~1158
In the range of DEG C, soften in the range of 1274~1282 DEG C of end temp, pressure difference skyrockets temperature in the range of 1315~1320 DEG C, drippage
Temperature is in the range of 1548~1552 DEG C, and in the range of 116~127 DEG C of softening temperature section, reflowing temperature section is 228~237
In DEG C section, reflowing temperature is high, and soft heat section is narrow, thus high-chromic vanadium-titanium ferroferrite with addition of ilmenite pellet soft
Molten drop falls with good gas permeability, and melt-dropping property is preferable, while the Fe and Ti rate of recovery is higher, and the Fe rate of recovery is up to 94
~97.5%, the Ti rate of recovery are up to 95~98%.Therefore the high-chromic vanadium-titanium ferroferrite in western red lattice area is climbed with addition of ilmenite
The pelletizing of preparation is suitable as producing rich-titanium material and iron-smelting raw material.The inventive method for red lattice high-chromic vanadium-titanium ferroferrite from now on and
The reasonable utilization of chromite, and the smelting of titanium provide theoretical foundation and technical foundation.
Brief description of the drawings
Fig. 1 is that high-chromic vanadium-titanium ferroferrite prepares pellet flow chart with addition of ilmenite in the inventive method.
Embodiment
In order to preferably explain the present invention, in order to understand, below in conjunction with the accompanying drawings, by embodiment, to this hair
It is bright to be described in detail.
The high-chromic vanadium-titanium ferroferrite that the embodiment of the present invention is selected is Sichuan area high-chromic vanadium-titanium ferroferrite, its
Main component excursion is respectively by weight percentage：TFe contents are that 50%~58%, FeO contents are 25%~30%,
TiO2Content is 10%~15%, Cr2O3Content is 0.5%~1.2%, V2O5Content is 0.5%~1.5%, and CaO content is
0.8~1.0%, SiO2Content is 4.6~4.8%, Al2O3Content is 2.7~2.9%.In order to utilize the chromium type high in red lattice area
Vanadium titano-magnetite is raw material, and the pellet for preparing higher quality improves the utilization rate of titanium, through lot of experiments, finally determines
It is that TFe contents are that 30%~40%, FeO contents are 10%~15%, TiO from the main component in ilmenite2Content is
45%~55%, CaO content is 0.5~1.0%, SiO2Content is 5~6%, Al2O3Content is 0.5~1.0%.One side titanium
The titanium grade of iron ore is high, can prepare pellet as a kind of iron ore deposit as the raw material for providing titanium, another aspect ilmenite
During, the similar characteristic that has to general iron ore, therefore the influence to sintering process is smaller.Process of the bentonite in pelletizing
In play adhesive, meanwhile, the stability and green ball strength of iron ore balling-up can be improved.
The size distribution of high-chromic vanadium-titanium ferroferrite and ilmenite is according to GB/T10322.7-2004 in the embodiment of the present invention
Standard determines.
The compression strength for the pellet that high-chromic vanadium-titanium ferroferrite is prepared with addition of ilmenite is according to GB/ in the embodiment of the present invention
T14201-1993 standards determine.
The low temperature reduction degradation index for the pellet that high-chromic vanadium-titanium ferroferrite is prepared with addition of ilmenite in the embodiment of the present invention
Determined according to GB/T13242-1991 standards.
The reduction swellability index for the pellet that high-chromic vanadium-titanium ferroferrite is prepared with addition of ilmenite in the embodiment of the present invention is adopted
Determined with GB/T13240-1991 standards.
The reproducibility measure for the pellet that high-chromic vanadium-titanium ferroferrite is prepared with addition of ilmenite uses in the embodiment of the present invention
GB/T13241-1991 standards are measured.
Below with reference to specific embodiment, the present invention will be described, it is necessary to which explanation, these embodiments are only explanation
Property, and be not considered as limiting the invention.
Embodiment 1
A kind of method that high-chromic vanadium-titanium ferroferrite prepares pellet with addition of ilmenite, as shown in figure 1, this method includes：
1. raw material drying
High-chromic vanadium-titanium ferroferrite, ilmenite and bentonite are dried in drying box processing, drying temperature 104
~108 DEG C, drying time is 3~4.5h, the moisture of high-chromic vanadium-titanium ferroferrite and ilmenite is less than or equal to 1.5%.
The moisture of high-chromic vanadium-titanium ferroferrite and ilmenite powder is the crystallization water in 1.2%~1.5% this scope after testing
Content, it is Free water more than the scope；To avoid the dry-mixed effect of free water effect, as bentonite absorbs chromium type high v-ti magnetite
It can reunite together after moisture in ore deposit and reduce the Blending Efficiency of Blending with high-chromic vanadium-titanium ferroferrite；Simultaneously in wet mixing process
In to ensure accurate adjustment moisture, avoid the moisture in high-chromic vanadium-titanium ferroferrite from influenceing the actual water in expecting after wet mixing
Point, therefore, the moisture of high-chromic vanadium-titanium ferroferrite and ilmenite is controlled≤1.5%.
Drying process can remove the Free water of high-chromic vanadium-titanium ferroferrite and ilmenite so that high-chromic vanadium-titanium ferroferrite
It is finer and close with ilmenite internal structure, the intensity of high-chromic vanadium-titanium ferroferrite and ilmenite is improved, and can also reduce
The viscosity of high-chromic vanadium-titanium ferroferrite and ilmenite, it is easy to pelletizing, while the temperature of calcination process can also be reduced, saves energy
Source.
Particle size distribution measurement is carried out to high-chromic vanadium-titanium ferroferrite and ilmenite using the method for wet screening, ground through many experiments
Discovery is studied carefully, when particle diameter is less than 75 μm of accounting in the range of 70%~75% in high-chromic vanadium-titanium ferroferrite；Ilmenite particle diameter is small
When 75 μm of accountings are in the range of 75%~95%, pellet strength is optimal value, can be used as pelletizing raw material；Otherwise need pair
High-chromic vanadium-titanium ferroferrite carries out pre-grinding processing so that particle diameter is less than 75 μm of accounting in the high-chromic vanadium-titanium ferroferrite in raw material
In the range of 70%~75%, accounting of the ilmenite particle diameter less than 75 μm is in the range of 75%~95%.
Because the particle size of raw material is related to its balling-up and pellet quality, it is related to pelletizing in dry and warm
Burst, be more related to the baking and concretion of pelletizing；Pellet feed can the particle diameter of balling-up be well to have a range of, original
Expect that particle diameter is excessive, then pellet quality declines, and it is low to be mainly manifested in pelletizing compression strength；Raw material particle size is too small, then to dry quick
Perception increase, heat endurance is poor, and pellet quality declines, and compression strength reduces, therefore, to high-chromic vanadium-titanium ferroferrite and ilmenite
Particle diameter to be controlled by.
2. mixing step
Calcium-base bentonite is added in high-chromic vanadium-titanium ferroferrite and ilmenite and carries out dry blending process, the dry-mixed time is 10~
15min, wherein the calcium-base bentonite added accounts for the 1~2% of high-chromic vanadium-titanium ferroferrite and ilmenite gross weight.Through many experiments
Research finds, when bentonite addition is less than 1%, the cohesiveness of pelletizing compound and balling-up are poor, and during higher than 2%,
Because moisture is absorbed by bentonite, pelletizing surface can not be expressed into time in balling process, caused under balling ratio and balling-up speed
Drop, therefore, the content of the bentonite addition in the present invention are selected in 1%~2%.Preferably, the calcium-base bentonite can also be hydrogen
The binding agent such as base bentonite or organobentonite.
The factor that pelletizing influences greenball properties in process of production is a lot, depends not only on bentonite performance itself, also with
Raw material characteristic in itself and bentonite are relevant with the adaptability of raw material, to make suitable bentonitic selection, it is necessary to made
Ball test, to determine suitable bentonite species and dosage, form of feed pretreatment and pellet forming process system, fallen by force with green-ball
Degree, the criterion of compression strength and burst temperature as quality of green pellets.Pass through verification experimental verification many times in this method, final choice
Bentonite is the binding agents such as calcium-base bentonite, hydrogen-based bentonite or organobentonite.
Wet mixing processing of spraying water is carried out to high-chromic vanadium-titanium ferroferrite and ilmenite again, its reclaimed water is uniform by high-pressure sprayer
It is sprayed onto on dry-mixed good high-chromic vanadium-titanium ferroferrite and ilmenite, carries out the wet mixing processing sprayed water when mixing, make water with uniform
Speed and flow be sprayed on high-chromic vanadium-titanium ferroferrite and ilmenite, make high-chromic vanadium-titanium ferroferrite and ilmenite composite ore
Uniformly drenched.Wherein, water-spraying amount is the 6~8.5% of low chromium type vanadium titano-magnetite and ilmenite gross weight, the time of wet mixing
For 10~15min.Show through lot of experiments, when the water-spraying amount is less than 6%, cause compound to accumulate in kick back
On, balling ratio and balling-up speed decline；And water-spraying amount be higher than 8.5% when, cause compound easily to be reunited in balling process,
Cause mother bulb quantity few, and pelletizing surface can not be dispersed in, and easily extruded and reunite by mother bulb, reduce pelletizing life
Long speed and balling ratio, therefore water-spraying amount is selected in 6~8.5%.
By the addition of mixing step bentonite and water, effectively increase high-chromic vanadium-titanium ferroferrite ballability and into
Ball speed.
3. the stewing material stage
Raw material after wet mixing is put into Stainless steel basin, with covering the uniform moisture that makes in raw material, while prevents moisture
Evaporation is reduced.Stainless steel basin is placed in 25~30 DEG C of insulating box and carries out stewing material, it is 30~35min to boil in a covered pot over a slow fire the material time.Constant temperature temperature
Degree selection is to slow down the speed of moisture evaporation and reduce the loss amount of moisture in the range of 25~30 DEG C；Simultaneously by stewing material temperature
Degree keeps constant, is the interference in order to reduce ambient temperature and moisture to compound, allows stewing material process to keep stable.The stewing material
Process is compared with the existing technology for not keeping the stewing material of constant temperature, and the moisture fluctuation of compound is small, and the wetting effect of compound is more preferably.
4. balling stage
The complete raw material of stewing material is subjected to pelletizing operation, the operational factor of the pelletizer in the pelletizing operation is：Disk is straight
Footpath is 1m, and rotating speed is 24~33r/min, and inclination angle is 44 °~49 °, and total Balling time is 20~30min.When rotating speed is less than 24r/
During min, the compound newly added accumulates in ball disk bottom, it is impossible to is rolled into ball disk on mother bulb, reduces pelletizing speed；And work as and turn
When speed is higher than 33r/min, the compound newly added can be accumulated on scraper plate because speed is excessive, reduces the contact with mother bulb
Efficiency, and reduce mother bulb coarsening rate.When inclination angle is less than 44 °, the less material of granularity can be caused to accumulate in overall pelletizing
Bottom, mother bulb growth rate slow down, and reduce the production efficiency of pelletizing；And when inclination angle is more than 49 °, filling out for pelletizer can be reduced
Rate is filled, if filling rate is too small, the production efficiency of pelletizing can be reduced.Therefore, the parameter of pelletizer elects rotating speed as in 24~33r/min
In the range of, inclination angle improves pellet quality in the range of 44 °~49 °, and balling-up efficiency is optimal, and the loss control of compound
In minimum zone.
In the pelletizing incipient stage, the high-chromic vanadium-titanium ferroferrite being spread in disk is disperseed with water, after granulating, used
Water jet spreading in water spray, when mother bulb diameter reaches 2~3mm, leave behind that part is appropriate and even-grained mother bulb, then
Continue the uniform spreading when being sprayed water with water jet, make the growth of pelletizing evenly.When the diameter of mother bulb reaches 9~10mm, stop
Only spray water.According to the uniform spreading in 1~2min interval, when pelletizing diameter is in the range of 10~12.5mm, stop spreading, pelletizing
Machine is rotated further 4~5min so that pellet strength strengthens.After pelletizer rotation terminates, pelletizing is taken out, is laid in pallet
In, obtain green-ball pelletizing.
5. pelletizing drying stage
The pallet for completing pelletizing is put into air dry oven, heated up by 5~10 DEG C/min heating rate, is heated up
To 105~110 DEG C, and it is incubated 2~3h；After insulation terminates, cooled by 5~10 DEG C/min rate of temperature fall, be cooled to room
Wen Hou, take out the operation that pelletizing carries out firing stage.
Found by lot of experiments, when heating rate is less than 5 DEG C/min, drying time can be increased；And the speed that heats up
When rate is more than 10 DEG C/min, due to the temperature difference increase of pelletizing outwardly and inwardly, causes the outside diffusion velocity of moisture to become big, can cause
Pelletizing short texture.When rate of temperature fall is less than 5 DEG C/min, drying time can be extended, be unfavorable for improving drying efficiency；And drop
When warm speed is more than 10 DEG C/min, due to lower than internal temperature outside pelletizing, and pelletizing outer layer is caused to shrink too fast and cause ball
Group's rupture.Drying pelletizing compression strength within this range can reach 35~45N/ simultaneously, higher than general vanadium titano-magnetite ball
Compression strength after group's drying process.Therefore, heating rate is selected in the range of 5~10 DEG C/min, and rate of temperature fall is selected in 5~10
DEG C/min in the range of, drying time is short, and pelletizing surface is complete, and the compression strength of pelletizing reaches preferable level after drying, into
Ball rate can reach more than 94%.
6. firing stage
The roasting apparatus of selection is horizontal Muffle furnace, and the horizontal Muffle furnace is controlled by multisection type temperature control program, temperature
Reach as high as 1350 DEG C.Dried pelletizing is placed in the flat-temperature zone of horizontal Muffle furnace, presses pelletizing weight at ventilating opening before fire door
Measure and blast the ratio 1 of gas flow:1~1:3 blast air or oxygen, wherein, the unit of the pelletizing weight is kg, institute
It is m to state gas flow unit3/h。
Alternatively, roasting apparatus is pellet roasting stove, and the pellet roasting stove is controlled by multisection type temperature control program, highest
Dried pelletizing is placed in the flat-temperature zone of pellet roasting stove up to 1400 DEG C by temperature, at furnace bottom passage by pelletizing weight with
Blast the ratio 1 of gas flow:1~1:3 blast air or oxygen, wherein, the unit of the pelletizing weight is kg, the gas
Body flux unit is m3/h.Alternatively, roasting apparatus is high temperature sintering furnace, and the high temperature sintering furnace is by multisection type temperature control journey
Sequence controls, and temperature reaches as high as 1600 DEG C, dried pelletizing is placed in the flat-temperature zone of high temperature sintering furnace, from stove it is suitable for reading from press ball
Group's weight and the ratio 1 for blasting gas flow:1~1:3 blast air or oxygen, wherein, the unit of the pelletizing weight is
Kg, the gas flow unit are m3/h。
After being warming up to 800~900 DEG C by 10~12 DEG C/min heating rate, heated up by 4~6 DEG C/min heating rate
To 1150~1250 DEG C, roasting time is 15~20min, after roasting terminates, is dropped by 5~8 DEG C/min rate of temperature fall
Temperature, wait and taken out after being down to 300 DEG C, carry out air cooling, high-chromic vanadium-titanium ferroferrite pelletizing is made.With other pellet roasting technology phases
Than without preheating, sintering temperature is relatively low, the time is short, can reach the requirement of ripe ball compression strength, and is maintained at 2542~3248
In the range of N, the production efficiency of high-chromic vanadium-titanium ferroferrite pelletizing is significantly improved, and saves the energy, reduces cost.
7. metallurgical performance detects
By by existing standard and experimental method, testing the metallurgical performance of high-chromic vanadium-titanium ferroferrite pelletizing,
Measure low-temperature reduction disintegration rate RDI+3.15In the range of 92~95%, much larger than 65% required by standard；Reduction swellability rate
RSI shows that reduction swellability rate is small in the range of 6.5~7.8%；Reproducibility RI shows reproducibility height in the range of 68~75%；
Soften start temperature in the range of 1155~1158 DEG C, soften in the range of 1274~1282 DEG C of end temp, pressure difference skyrockets temperature
In the range of 1315~1320 DEG C, drippage temperature is in the range of 1548~1552 DEG C, 116~127 DEG C of softening temperature section scope
Interior, reflowing temperature section is in 228~237 DEG C of sections, and reflowing temperature is high, and soft heat section is narrow, it is above-mentioned measure it is metallurgical
Preferably metallurgical performance can be met.Wherein, preferably the index of metallurgical performance includes low temperature reduction degradation index RDI+3.15It is more than
65%, reduction swellability rate RSI are less than 15%, and reproducibility RI is more than 60%, and soft heat section is narrow and less than 250 DEG C.Melt drippage by soft
Slag and iron afterwards carries out chemical analysis, can obtain the Fe rate of recovery in the range of 94~97.5%, the Ti rate of recovery is 95~98%
In the range of.As a result pelletizing metallurgical performance numerical value manufactured in the present embodiment is shown preferably in numerical intervals, and metal recovery
Rate is higher, can be used as iron-smelting raw material simultaneously, Ti recovery is also improved.The metallurgical performance data measured above are chromium type high
The pellet that vanadium titano-magnetite is prepared with addition of ilmenite, and provide it to foundation and reference in ironmaking production application.
Embodiment 2
A kind of method that high-chromic vanadium-titanium ferroferrite prepares pellet with addition of ilmenite, the present embodiment are in embodiment 1
On the basis of, concrete operation step is as follows：
1. raw material drying
4.5kg high-chromic vanadium-titanium ferroferrites, 0.5kg ilmenites are taken, bentonite is high-chromic vanadium-titanium ferroferrite and ilmenite
The 1% of gross weight, it is dried in drying box processing, drying temperature is 105 DEG C, drying time 4h, is measured after drying
The water content of high-chromic vanadium-titanium ferroferrite is 1.2%, and the water content of ilmenite is 1.4%.Wherein, the method pair of wet screening is utilized
High-chromic vanadium-titanium ferroferrite and ilmenite carry out the accounting that particle diameter in particle size distribution measurement high-chromic vanadium-titanium ferroferrite is less than 75 μm
For 72%；Accounting of the ilmenite particle diameter less than 75 μm is 92%.
2. mixing step
Calcium-base bentonite is added in high-chromic vanadium-titanium ferroferrite and carries out dry blending process, the dry-mixed time is 10min.
Wet mixing processing of spraying water is carried out to high-chromic vanadium-titanium ferroferrite and ilmenite compound again, its reclaimed water passes through high-pressure fog
Device is uniformly sprayed onto on dry-mixed good high-chromic vanadium-titanium ferroferrite and ilmenite compound, at the wet mixing that progress is sprayed water when mixing
Reason.Wherein water-spraying amount is the 6% of the low chromium type vanadium titano-magnetite and ilmenite gross weight, and the wet mixing time is 10min.
3. the stewing material stage
Raw material after wet mixing is placed in Stainless steel basin, covered with lid, Stainless steel basin is placed in 28 DEG C of insulating box
The stewing material of row, it is 30min to boil in a covered pot over a slow fire the material time.
4. balling stage
The complete raw material of stewing material is subjected to pelletizing operation, the operational factor of the pelletizer in the pelletizing operation is：Disk is straight
Footpath is 1m, and rotating speed 24r/min, inclination angle is 44 °, and total Balling time is 24 min.In the pelletizing incipient stage, circle will be spread on water
High-chromic vanadium-titanium ferroferrite in disk is disperseed, and after granulating, with water jet spreading in water spray, treats that pelletizing diameter reaches 2
During~3mm, leave behind that part is appropriate and even-grained pelletizing, then proceed to the uniform spreading when being sprayed water with water jet, treat ball
When the diameter of group reaches 9~10mm, stop water spray.According to the uniform spreading in 1~2min interval, treat pelletizing diameter 10~
When in the range of 12.5mm, stop spreading, pelletizer is rotated further 4~5min.After pelletizer rotation terminates, pelletizing is taken out, will
It is laid in pallet.
5. pelletizing drying stage
The pallet for completing pelletizing is put into air dry oven, is heated up, is warming up to by 5 DEG C/min heating rate
105 DEG C, and it is incubated 2h；After insulation terminates, cooled by 5 DEG C/min rate of temperature fall.After being down to room temperature, take out pelletizing and carry out
Compressive strength test, compression strength are 35N/, balling ratio 95%.
6. firing stage
The roasting apparatus of selection is horizontal Muffle furnace, first takes 0.5kg to dry the pelletizing completed, and is placed in the perseverance of horizontal Muffle furnace
Warm area, at ventilating opening by gas flow it is 1m before fire door3/ h carries out rousing oxygen, is warming up to by 10 DEG C/min heating rate
850 DEG C, 1150 DEG C then are warming up to by 4 DEG C/min heating rate, roasting time 15min；Roasting terminate after, by 5 DEG C/
Min rate of temperature fall is cooled.Etc. taking out after being down to 300 DEG C, air cooling is carried out, high-chromic vanadium-titanium ferroferrite pelletizing is made.
The pelletizing completed will be calcined according to the standard test of GB/T14201~1993, take 60 pelletizings to be measured, pressure resistance
It is 2934N that degree, which takes the arithmetic mean of instantaneous value of measured value, meets blast furnace feeding standard.
7. metallurgical performance detects
Pelletizing is subjected to metallurgical performance detection：Low-temperature reduction disintegration rate RDI+3.15For 92.35%；Reduction swellability rate RSI
For 6.8%；Reproducibility RI is 69.34%；It is 1156 DEG C to soften start temperature, and softening end temp is 1275 DEG C, and pressure difference skyrockets
Temperature is 1316 DEG C, and drippage temperature is 1549 DEG C, and softening temperature is 119 DEG C, and reflowing temperature is 233 DEG C.By it is soft melt drippage after
Slag and iron carry out chemical analysis, and the rate of recovery that the rate of recovery that can obtain Fe is 94.2%, Ti is 95%.As a result the present embodiment system is shown
Standby pelletizing metallurgical performance numerical value is preferably in numerical intervals, and metal recovery rate is higher, can be used as iron-smelting raw material simultaneously,
Ti recovery is also improved.
Embodiment 3
The present embodiment is that concrete operations are as follows on the basis of embodiment 1：
1. raw material drying
4.4kg high-chromic vanadium-titanium ferroferrites are taken, 0.6kg ilmenites and calcium-base bentonite account for high-chromic vanadium-titanium ferroferrite weight
1.2%, in drying box these three raw materials are dried with processing, drying temperature is 106 DEG C, drying time 3.4h, is done
The water content that high-chromic vanadium-titanium ferroferrite and ilmenite are measured after dry is 1.25% and 1.3%.Wherein, the method pair of wet screening is utilized
High-chromic vanadium-titanium ferroferrite and ilmenite carry out the accounting that particle diameter in particle size distribution measurement high-chromic vanadium-titanium ferroferrite is less than 75 μm
For 72%；Accounting of the ilmenite particle diameter less than 75 μm is 82%.
2. mixing step
Hydrogen-based bentonite is added in high-chromic vanadium-titanium ferroferrite and ilmenite and carries out dry blending process, the dry-mixed time is
12min。
Wet mixing processing of spraying water is carried out to high-chromic vanadium-titanium ferroferrite again, its reclaimed water is uniformly sprayed onto dry by high-pressure sprayer
On mixed high-chromic vanadium-titanium ferroferrite, the wet mixing processing sprayed water when mixing is carried out.Wherein water-spraying amount is high-chromic vanadium titanium magnetic
The 6.5% of iron ore and ilmenite gross weight, wet mixing time are 12min.
3. the stewing material stage
Raw material after wet mixing is placed in Stainless steel basin, covered with lid, Stainless steel basin is placed in 30 DEG C of insulating box
The stewing material of row, it is 32min to boil in a covered pot over a slow fire the material time.
4. balling stage
The complete raw material of stewing material is subjected to pelletizing operation, the operational factor of the pelletizer in the pelletizing operation is：Disk is straight
Footpath is 1m, and rotating speed 26r/min, inclination angle is 46 °, and total Balling time is 26 min.In the pelletizing incipient stage, circle will be spread on water
High-chromic vanadium-titanium ferroferrite in disk is disperseed, and after granulating, with water jet spreading in water spray, treats that pelletizing diameter reaches 2
During~3mm, leave behind that part is appropriate and even-grained pelletizing, then proceed to the uniform spreading when being sprayed water with water jet, treat ball
When the diameter of group reaches 9~10mm, stop water spray.According to the uniform spreading in 1~2min interval, treat pelletizing diameter 10~
When in the range of 12.5mm, stop spreading, pelletizer is rotated further 4~5min.After pelletizer rotation terminates, pelletizing is taken out, will
It is laid in pallet.
5. pelletizing drying stage
The pallet for completing pelletizing is put into air dry oven, is heated up, is warming up to by 8 DEG C/min heating rate
106 DEG C, and it is incubated 2.2h；After insulation terminates, cooled by 10 DEG C/min rate of temperature fall.After being down to room temperature, pelletizing is taken out
Compressive strength test is carried out, compression strength is 43 N/, balling ratio 97%.
6. firing stage
The roasting apparatus of selection is pellet roasting stove, first takes 0.5kg to dry the pelletizing completed, and is placed in the perseverance of pellet roasting stove
Warm area, pressed in furnace bottom at ventilating opening using gas flow as 1.5m3/ h carries out rousing air, is risen by 11 DEG C/min heating rate
Then temperature is warming up to 1194 DEG C, roasting time 15min to 900 DEG C by 5 DEG C/min heating rate；After roasting terminates, by 6
DEG C/min rate of temperature fall cooled；Etc. taking out after being down to 300 DEG C, carry out air cooling, be made high-chromic vanadium-titanium ferroferrite with addition of
Pellet prepared by ilmenite.
The pelletizing completed will be calcined according to the standard test of GB/T14201~1993, take 60 pelletizings to be measured, pressure resistance
It is 2542N that degree, which takes the arithmetic mean of instantaneous value of measured value, meets blast furnace feeding standard.
7. metallurgical performance detects
Pelletizing is subjected to metallurgical performance detection：Low-temperature reduction disintegration rate RDI+3.15For 93.4%；Reduction swellability rate RSI is
7.2%；Reproducibility RI is 71%；It is 1157 DEG C to soften start temperature, and softening end temp is 1275 DEG C, and the pressure difference temperature that skyrockets is
1316 DEG C, drippage temperature is 1549 DEG C, and softening temperature is 118 DEG C, and reflowing temperature is 233 DEG C, by the soft slag and iron melted after dripping
Chemical analysis is carried out, the rate of recovery that the rate of recovery that can obtain Fe is 95.5%, Ti is 96.3%.As a result show manufactured in the present embodiment
Pelletizing metallurgical performance numerical value is preferably in numerical intervals, and metal recovery rate is higher, can be used as iron-smelting raw material simultaneously, Ti's
Recovery is also improved.
Embodiment 4
The present embodiment is that concrete operations are as follows on the basis of embodiment 1：
1. raw material drying
4.3kg high-chromic vanadium-titanium ferroferrites are taken, 0.7kg ilmenites, it are dried in drying box processing, dry temperature
Spend for 109 DEG C, drying time 3.7h, measure high-chromic vanadium-titanium ferroferrite after drying and the water content of ilmenite is respectively
1.28% and 1.4%.Wherein, particle size distribution measurement height is carried out to high-chromic vanadium-titanium ferroferrite and ilmenite using the method for wet screening
Accounting of the particle diameter less than 75 μm is 74% in chromic vanadium-titanium ferroferrite；Accounting of the ilmenite particle diameter less than 75 μm is 85%.
2. mixing step
Organobentonite is added in high-chromic vanadium-titanium ferroferrite and ilmenite and carries out dry blending process, the dry-mixed time is
13min, wherein the organobentonite added accounts for the 1.5% of high-chromic vanadium-titanium ferroferrite weight.
Wet mixing processing of spraying water is carried out to high-chromic vanadium-titanium ferroferrite and ilmenite mixture again, its reclaimed water passes through high-pressure fog
Device is uniformly sprayed onto on dry-mixed good high-chromic vanadium-titanium ferroferrite, carries out the wet mixing processing sprayed water when mixing.Wherein water-spraying amount
For the 8.5% of high-chromic vanadium-titanium ferroferrite and ilmenite gross weight, the wet mixing time is 15min.
3. the stewing material stage
Raw material after wet mixing is placed in Stainless steel basin, covered with lid, Stainless steel basin is placed in 28 DEG C of insulating box
The stewing material of row, it is 32min to boil in a covered pot over a slow fire the material time.
4. balling stage
The complete raw material of stewing material is subjected to pelletizing operation, the operational factor of the pelletizer in the pelletizing operation is：Disk is straight
Footpath is 1m, and rotating speed 28r/min, inclination angle is 48 °, and total Balling time is 28 min.In the pelletizing incipient stage, circle will be spread on water
High-chromic vanadium-titanium ferroferrite in disk is disperseed, and after granulating, with water jet spreading in water spray, treats that pelletizing diameter reaches 2
During~3mm, the appropriate even-grained pelletizing in part is left behind, the uniform spreading when being sprayed water with water jet is then proceeded to, treats ball
When the diameter of group reaches 9~10mm, stop water spray.According to the uniform spreading in 1~2min interval, treat pelletizing diameter 10~
When in the range of 12.5mm, stop spreading, pelletizer is rotated further 4~5min.After pelletizer rotation terminates, pelletizing is taken out, will
It is laid in pallet.
5. pelletizing drying stage
The pallet for completing pelletizing is put into air dry oven, is heated up, is warming up to by 10 DEG C/min heating rate
108 DEG C, and it is incubated 2.3h；After insulation terminates, cooled by 8 DEG C/min rate of temperature fall.After being down to room temperature, take out pelletizing and enter
Row compressive strength test, compression strength are 41N/, balling ratio 97%.
6. firing stage
The roasting apparatus of selection is high temperature sintering furnace, first takes 1kg to dry the pelletizing completed, and is placed in the constant temperature of high temperature sintering furnace
Area, suitable for reading in stove by gas flow is 2m3/ h carries out rousing air, carries out being warming up to 900 DEG C by 10 DEG C/min heating rate,
Then 1220 DEG C are warming up to by 6 DEG C/min heating rate, roasting time 14min；After roasting terminates, by 8 DEG C/min drop
Warm speed is cooled.Etc. taking out after being down to 300 DEG C, air cooling is carried out, high-chromic vanadium-titanium ferroferrite pelletizing is made.
The pelletizing completed will be calcined according to the standard test of GB/T14201~1993, take 60 pelletizings to be measured, pressure resistance
It is 3247N that degree, which takes the arithmetic mean of instantaneous value of measured value, meets blast furnace feeding standard.
7. metallurgical performance detects
Pelletizing is subjected to metallurgical performance detection：Low-temperature reduction disintegration rate RDI+3.15For 93.5%；Reduction swellability rate RSI is
6.9%；Reproducibility RI is 73.5%；It is 1156 DEG C to soften start temperature, and softening end temp is 1280 DEG C, and pressure difference skyrockets temperature
For 1318 DEG C, drippage temperature be 1549 DEG C, softening temperature be 124 DEG C, reflowing temperature be 231 DEG C, by it is soft melt drippage after slag and
Iron carries out chemical analysis, and the rate of recovery that the rate of recovery that can obtain Fe is 96.7%, Ti is 97.2%.As a result show prepared by the present embodiment
Pelletizing metallurgical performance numerical value preferably in numerical intervals, and metal recovery rate is higher, can be used as iron-smelting raw material simultaneously, Ti
Recovery be also improved.
Embodiment 5
The present embodiment is that concrete operations are as follows on the basis of embodiment 1：
1. raw material drying
4.2kg high-chromic vanadium-titanium ferroferrites, 0.8kg ilmenites are taken, hydrogen-based bentonite accounts for high-chromic vanadium-titanium ferroferrite weight
1.1%, it is dried in drying box processing, drying temperature is 107 DEG C, drying time 4.2h, is measured after drying
The water content of high-chromic vanadium-titanium ferroferrite and ilmenite is respectively 1.3% and 1.4%, wherein, using the method for wet screening to Gao Ge
Type vanadium titano-magnetite and ilmenite carry out accounting of the particle diameter less than 75 μm in particle size distribution measurement high-chromic vanadium-titanium ferroferrite
73%；Accounting of the ilmenite particle diameter less than 75 μm is 91%.
2. mixing step
Calcium-base bentonite is added in high-chromic vanadium-titanium ferroferrite and ilmenite and carries out dry blending process, the dry-mixed time is
13min。
Wet mixing processing of spraying water is carried out to high-chromic vanadium-titanium ferroferrite and ilmenite again, its reclaimed water is uniform by high-pressure sprayer
It is sprayed onto on dry-mixed good composite ore, carries out the wet mixing processing sprayed water when mixing.Wherein water-spraying amount is chromium type high v-ti magnetite
The 7.5% of ore deposit and ilmenite gross weight, wet mixing time are 14min.
3. the stewing material stage
Raw material after wet mixing is placed in Stainless steel basin, covered with lid, Stainless steel basin is placed in 28 DEG C of insulating box
The stewing material of row, it is 32min to boil in a covered pot over a slow fire the material time.
4. the complete raw material of stewing material is carried out pelletizing operation, the operational factor of the pelletizer in the pelletizing operation by balling stage
For：Disk diameter is 1m, and rotating speed 31r/min, inclination angle is 48 °, and total Balling time is 25min.In the pelletizing incipient stage, water is used
The high-chromic vanadium-titanium ferroferrite being spread in disk is disperseed, after granulating, with water jet spreading in water spray, treats that pelletizing is straight
When footpath reaches 2~3mm, the appropriate even-grained pelletizing in part is left behind, then proceedes to uniformly spread when being sprayed water with water jet
Material, when the diameter of pelletizing reaches 9~10mm, stop water spray.According to the uniform spreading in 1~2min interval, treat that pelletizing diameter exists
When in the range of 10~12.5mm, stop spreading, pelletizer is rotated further 4~5min.After pelletizer rotation terminates, pelletizing is taken
Go out, be laid in pallet.
5. pelletizing drying stage
The pallet for completing pelletizing is put into air dry oven, is heated up, is warming up to by 5 DEG C/min heating rate
106 DEG C, and it is incubated 3h；After insulation terminates, cooled by 5 DEG C/min rate of temperature fall.After being down to room temperature, take out pelletizing and carry out
Compressive strength test, compression strength are 45N/, balling ratio 97%.
6. firing stage
The roasting apparatus of selection is horizontal Muffle furnace, first takes 0.5kg to dry the pelletizing completed, and is placed in the perseverance of horizontal Muffle furnace
Warm area, at ventilating opening by gas flow it is 1.2m before fire door3/ h carries out rousing air, is heated up by 10 DEG C/min heating rate
To 890 DEG C, 1210 DEG C then are warming up to by 5 DEG C/min heating rate, roasting time 18min；Roasting terminate after, by 6 DEG C/
Min rate of temperature fall is cooled.Etc. taking out after being down to 300 DEG C, air cooling is carried out, high-chromic vanadium-titanium ferroferrite pelletizing is made.
The pelletizing completed will be calcined according to the standard test of GB/T14201~1993, take 60 pelletizings to be measured, pressure resistance
It is 3248N that degree, which takes the arithmetic mean of instantaneous value of measured value, meets blast furnace feeding standard.
7. metallurgical performance detects
Pelletizing is subjected to metallurgical performance detection：Low-temperature reduction disintegration rate RDI+3.15For 94.6%；Reduction swellability rate RSI is
7.4%；Reproducibility RI is 73.3%；It is 1157 DEG C to soften start temperature, and softening end temp is 1281 DEG C, and pressure difference skyrockets temperature
For 1317 DEG C, drippage temperature be 1551 DEG C, softening temperature be 124 DEG C, reflowing temperature be 234 DEG C, by it is soft melt drippage after slag and
Iron carries out chemical analysis, and the rate of recovery that the rate of recovery that can obtain Fe is 97.2%, Ti is 97.8%.As a result show prepared by the present embodiment
Pelletizing metallurgical performance numerical value preferably in numerical intervals, and metal recovery rate is higher, can be used as iron-smelting raw material simultaneously, Ti
Recovery be also improved.
Comparative example
Pelletizing is prepared using prior art, is CN105349774A with reference to existing patent publication No., a kind of high titanyl ball
Prepared by group's production method, carried out, specifically included using method in embodiment 1：Take 5kg high-chromic vanadium-titanium ferroferrites, 5kg
Ilmenite and 0.2kg calcium-base bentonites dry 1h at 300 DEG C；Load and batch mixing 10min is carried out in batch mixer, then utilize circle
Disk pelletizer (rotating speed 23r/min, 46 ° of inclination angle) pelletizing, total time 5min.Then green-ball is put into Muffle furnace and be dried to
Shape.
According to the pelletizing preparation method in above-mentioned document, the relatively low balling ratio of high-chromic vanadium-titanium ferroferrite pelletizing is 42%,
Pelletizing compression strength after the completion of drying is 24N/, and the pelletizing compression strength after the completion of roasting is 1321N.It is metallurgical through pelletizing
After determining, its low-temperature reduction disintegration rate RDI+3.15For 84%, reduction swellability rate RSI is 13.2%；Reproducibility RI is
53.1%；It is 1168 DEG C to soften start temperature, and softening end temp is 1325 DEG C, and pressure difference skyrockets temperature as 1331 DEG C, drippage temperature
Spend for 1547 DEG C, softening temperature section is 157 DEG C, and reflowing temperature section is 216 DEG C.By the soft slag and iron melted after dripping
Credit is analysed, and the rate of recovery that the rate of recovery that can obtain Fe is 95.2%, Ti is 75.3%.By the preparation method of prior art, as a result say
Its bright balling-up is poor, and balling ratio is low, and drying temperature is high, roasting time length, green ball strength and ripe ball low intensity, and to pelletizing
Metallurgical performance has a great influence, and reduces low-temperature reduction disintegration rate and reproducibility, improves reduction swellability rate, as a result illustrates low temperature
Metallurgical performance is deteriorated, while the Ti rate of recovery is relatively low.
The above described is only a preferred embodiment of the present invention, being not the limitation that other forms are done to the present invention, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But it is every without departing from technical solution of the present invention content, the technical spirit according to the present invention is to above example institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection domain of technical solution of the present invention.
Claims (10)
1. a kind of method that high-chromic vanadium-titanium ferroferrite prepares pellet with addition of ilmenite, it is characterised in that it includes following step
Suddenly：
S1, raw material drying：High-chromic vanadium-titanium ferroferrite, ilmenite and bentonite are dried, are less than or equal to its moisture
1.5%；
S2, batch mixing：By the dried high-chromic vanadium-titanium ferroferrite, ilmenite and the dry-mixed 10~15min of bentonite, spray afterwards
Water, carry out wet mixing；
S3, pelletizing：Raw material after above-mentioned processing is put into the green-ball that a diameter of 10~12.5mm is prepared in pelletizer；
S4, pelletizing are dried：The green-ball is put into drying box, is heated up, is warming up to by 5~10 DEG C/min heating rate
2~3h is incubated at 105~110 DEG C；Afterwards, cooled by 5~10 DEG C/min rate of temperature fall；
S5, roasting：The dried green-ball is calcined, pelletizing is warming up to by 10~12 DEG C/min heating rate
800~900 DEG C；Then, 1150~1250 DEG C are warming up to by 4~6 DEG C/min heating rate, are calcined 15~20min；Afterwards,
Cooled by 5~8 DEG C/min rate of temperature fall, taken out after being down to 300 DEG C, high-chromic vanadium-titanium ferroferrite is made with addition of ilmenite
Pellet.
2. the method as described in claim 1, it is characterised in that in step sl, the TFe in the high-chromic vanadium-titanium ferroferrite
Content is that 50%~58%, FeO contents are 25%~30%, TiO2Content is 10%~15%, Cr2O3Content be 0.5%~
1.2%, V2O5Content is 0.5%~1.5%, and CaO content is 0.8~1.0%, SiO2Content is 4.6~4.8%, Al2O3Content
For 2.7~2.9%；
TFe contents in the ilmenite are that 30%~40%, FeO contents are 10%~15%, TiO2Content be 45%~
55%, CaO content is 0.5~1.0%, SiO2Content is 5~6%, Al2O3Content is 0.5~1.0%.
3. the method as described in claim 1, it is characterised in that the particle diameter of the high-chromic vanadium-titanium ferroferrite accounting for less than 75 μm
Than in the range of 70%~75%；
Accounting of the particle diameter of the ilmenite less than 75 μm is in the range of 75%~95%.
4. the method as described in claim 1, it is characterised in that in step sl, the temperature of the drying is 104~108 DEG C,
Drying time is 3~4.5h.
5. the method as described in claim 1, it is characterised in that in step s 2, the dosage of the high-chromic vanadium-titanium ferroferrite
For 15~75 parts by weight, the dosage of the ilmenite is 5~25 parts by weight, and the bentonite accounts for the high-chromic vanadium-titanium ferroferrite
With the 1~2% of ilmenite gross mass.
6. the method as described in claim 1, it is characterised in that the bentonite is calcium-base bentonite, hydrogen-based bentonite or had
Machine bentonite.
7. the method as described in claim 1, it is characterised in that in step s 2, the water spray is to spray spray water, water consumption
Account for the 6~8.5% of the low chromium type vanadium titano-magnetite and ilmenite gross weight, 10~15min of mixing time of the wet mixing.
8. the method as described in claim 1, it is characterised in that before step S3 pelletizings, by the original after the step S2 wet mixings
Material, which is placed in 25~30 DEG C of constant temperature, carries out 30~35min of stewing material.
9. the method as described in claim 1, it is characterised in that in the step S3 pelletizings, preparing green-ball includes following step
Suddenly：The raw material is disperseed with water, after granulating, raw material is spread in water spray, when mother bulb diameter reaches 2~3mm, leaves
Even-grained mother bulb, continue uniformly to spread raw material in water spray, when reaching 9~10mm to the diameter of pelletizing, stop water spray；According to
1~2min uniform the spreading in interval, when pelletizing diameter is in the range of 10~12.5mm, stop spreading, pelletizer is rotated further 4
Green-ball is obtained after~5min, wherein, the rotating speed of the pelletizer is set to 24~33r/min, and inclination angle is set to 44 °~49 °.
10. the method as described in claim 1, it is characterised in that the roasting is using horizontal Muffle furnace, pellet roasting stove or height
Warm sintering furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN1804059A (en) * | 2005-12-15 | 2006-07-19 | 鲜帆 | Direction reduction and electric furnace smelting-separation preparation process of vanadium-titanium magnetite cold bound pellet |
| CN102220486A (en) * | 2011-06-22 | 2011-10-19 | 攀钢集团有限公司 | Acidic full-vanadium-titanium pellets and preparation method thereof |
| CN105907956A (en) * | 2016-06-27 | 2016-08-31 | 东北大学 | Low-grade chromium-containing vanadium titanium magnetite oxidized pellet and preparation method thereof |
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| CN1804059A (en) * | 2005-12-15 | 2006-07-19 | 鲜帆 | Direction reduction and electric furnace smelting-separation preparation process of vanadium-titanium magnetite cold bound pellet |
| CN102220486A (en) * | 2011-06-22 | 2011-10-19 | 攀钢集团有限公司 | Acidic full-vanadium-titanium pellets and preparation method thereof |
| CN105907956A (en) * | 2016-06-27 | 2016-08-31 | 东北大学 | Low-grade chromium-containing vanadium titanium magnetite oxidized pellet and preparation method thereof |
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