CN107475514A - A kind of preparation method of high-chromic vanadium-titanium ferroferrite pelletizing - Google Patents
A kind of preparation method of high-chromic vanadium-titanium ferroferrite pelletizing Download PDFInfo
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- CN107475514A CN107475514A CN201710620531.4A CN201710620531A CN107475514A CN 107475514 A CN107475514 A CN 107475514A CN 201710620531 A CN201710620531 A CN 201710620531A CN 107475514 A CN107475514 A CN 107475514A
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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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/02—Roasting processes
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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
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
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Abstract
The present invention relates to a kind of preparation method of high-chromic vanadium-titanium ferroferrite pelletizing, it includes：High-chromic vanadium-titanium ferroferrite is dried, its moisture is less than or equal to 1.4%；By dried magnetic iron ore and the dry-mixed 10~15min of bentonite, spray water 10~15min of wet mixing afterwards；Raw material after wet mixing is placed in 25~30 DEG C of constant temperature and carries out 30~35min of stewing material；Raw material after stewing material is put into the green-ball that a diameter of 10~12.5mm is prepared in pelletizer；Dry green-ball；Dried green-ball is calcined, after pelletizing is warming up into 800~900 DEG C by 10~12 DEG C/min heating rate, 1150~1200 DEG C is warming up to by 4~6 DEG C/min heating rate, is calcined 15~20min；Cooled again by 5~8 DEG C/min rate of temperature fall, taken out after being down to 300 DEG C, carry out air cooling.Moisture evaporation speed is small when the present invention boils in a covered pot over a slow fire material；Balling-up efficiency high；Pelletizing drying time is short, and the compression strength of pelletizing is high after drying；Sintering temperature is low, and the time is short；The low-temperature reduction disintegration rate height of pelletizing is made, reduction swellability rate is small, and reproducibility is high, and reflowing temperature is high, and soft heat section is narrow.
Description
Technical field
The invention belongs to iron-smelting raw material production field, and in particular to a kind of preparation side of high-chromic vanadium-titanium ferroferrite pelletizing
Method.
Background technology
With the development of v-bearing titanomagnetite smelting technology so that the valuable element such as the Fe in schreyerite containing chromium type, Ti, V, Cr
It is fully used, and the comprehensive reutilization of the resource such as blast furnace titaniferous slag, vanadium slag provides the titanium resource of preciousness for China,
Chromium resource and vanadium resource.With the progress of vanadium titano-magnetite ore dressing technology, beneficiation cost is reduced, and yield and Iron grade are carried
It is high.
The vanadium titano-magnetite in Panxi, Sichuan red lattice area is a kind of complicated pluralism element associated minerals, its main Fe and Ti element
Constitute the association such as magnetic iron ore, titanomagnetite and ilmenite, other valuable element V and Cr formed in magnetic iron ore coulsonite and
Ishkulite.The v-ti magnetite ore reserves in Pan Xi mining areas is larger, accounts for the 74% of the whole nation, the comprehensive utilization to its valuable element has
Considerable prospect.
The burden structure of blast furnace process be high basicity sinter with addition of acidic pellet ore and high-grade lump ore, and pelletizing exists
Ratio in blast fumance accounts for 20%, and its metallurgical performance has critically important influence to blast furnace process.So to v-ti magnetite
Comprehensive utilization of the research of ore deposit pelletizing to vanadium titano-magnetite has great significance.And abundant v-ti magnetite ore reserves can subtract
Dependence of the light Iron and Steel Enterprises in China to imported iron ore simultaneously reduces cost.
Still be in conceptual phase due to climbing western red lattice area high-chromic vanadium-titanium ferroferrite at this stage, its as iron-smelting raw material also
Complete pellet preparation technology is not formed, and climbs the thing of western red lattice area high-chromic vanadium-titanium ferroferrite and other type schreyerite
Matter composition and property are different, such as the Iron grade of the low-grade schreyerite containing chromium type is low, and belong to the low Cr-V-Ti of hematite-type
Ore deposit, not only temperature is high but also the time is grown for the drying system in the preparation technology of its pellet, and pelletizing surface is imperfect, and pelletizing
Intensity exceeds well over pellet strength requirement needed for blast furnace, and the production efficiency and metallurgical performance to pellet have a certain impact, consumption
Can be high, cost is high and reproducibility is poor.And the preparation process of other type vanadium-titanium pellets, moisture evaporation speed when stewing material be present
Greatly, moisture loss amount is big, and the moisture fluctuation of compound is big, and pelletizing easily bursts, and balling-up efficiency is low；Preheating time is grown, during roasting
Between and temperature range it is big, pellet quality, the problems such as the transformation of element and indefinite metallurgical performance, so existing pelletizing prepares work
Skill is not suitable for climbing western red lattice area high-chromic vanadium-titanium ferroferrite.
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 preparation side of high-chromic vanadium-titanium ferroferrite pelletizing
Method, moisture evaporation speed is big when solving stewing material in the prior art, and moisture loss amount is big, and the moisture fluctuation of compound is big；Pelletizing
Drying time is grown, and pelletizing surface is imperfect；The pellet roasting time is grown, and sintering temperature is high, the low production efficiency of pelletizing, and power consumption is high,
The problem of cost is high.
(2) technical scheme
In order to achieve the above object, the main technical schemes that the present invention uses include：
A kind of preparation method of high-chromic vanadium-titanium ferroferrite pelletizing, it is characterised in that it includes：
Raw material drying：High-chromic vanadium-titanium ferroferrite is dried, its moisture is less than or equal to 1.4%；
Mixing step：By the dried high-chromic vanadium-titanium ferroferrite and the dry-mixed 10~15min of bentonite, spray water afterwards
10~15min of wet mixing；
The stewing material stage：Raw material after the wet mixing is placed in 25~30 DEG C of constant temperature and carries out 30~35min of stewing material；
Balling stage：Raw material after the stewing material is put into the green-ball that a diameter of 10~12.5mm is prepared in pelletizer；
Pelletizing drying stage：The green-ball is put into drying box, heated up by 5~10 DEG C/min heating rate,
2~3h is incubated when being warming up to 105~110 DEG C；Afterwards, cooled by 5~10 DEG C/min rate of temperature fall；
Firing stage：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, 1150~1200 DEG C are warming up to by 4~6 DEG C/min heating rate, are calcined 15~20min；It
Afterwards, cooled by 5~8 DEG C/min rate of temperature fall, taken out after being down to 300 DEG C, carry out air cooling, chromium type high v-ti magnetite is made
Ore deposit pelletizing.
Method as described above, it is preferable that the TFe contents in the high-chromic vanadium-titanium ferroferrite are 50%~58%, FeO
Content is 25%~30%, Cr2O3Content is 0.5%~1.2%, V2O5Content is 0.5%~1.5%, TiO2Content be 5%~
12.6%, content of MgO is 2%~4%, Al2O3Content is 2.2%~3.2%, and CaO content is 0.5%~1%, SiO2Content
For 2.2%~5%.
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%.
Method as described above, it is preferable that the temperature of the raw material drying be 105~108 DEG C, drying time be 4~
4.5h。
Method as described above, it is preferable that the bentonitic addition is the high-chromic vanadium-titanium ferroferrite weight
0.8~1.4%.
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 the water-spraying amount in the wet mixing stage for it is described it is dry-mixed after high-chromic vanadium titanium
The 6.5~12% of magnetic iron ore gross weight.
Method as described above, it is preferable that the balling stage prepares green-ball and comprised the following steps：With water by the raw material
Disperseed, after granulating, spread raw material in water spray, when mother bulb diameter reaches 2~3mm, leave even-grained mother bulb, after
It is continuous uniformly to spread raw material in water spray, when reaching 9~10mm to the diameter of pelletizing, stop water spray；It is uniform according to 1~2min interval
Spreading, when pelletizing diameter is in the range of 10~12.5mm, stop spreading, pelletizer obtains green-ball after being rotated further 4~5min.
Method as described above, it is preferable that the rotating speed of the pelletizer is set to 25.5~30.2r/min, and inclination angle is set to 43
~47 °.
Method as described above, it is preferable that the roasting is using horizontal Muffle furnace, pellet roasting stove or high temperature sintering furnace.
(3) beneficial effect
The beneficial effects of the invention are as follows：
1. 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%, the green ball strength of preparation can be allowed to reach optimal；
2. the stewing material stage of the inventive method carries out the stewing material of constant temperature, moisture evaporation speed in the range of 25~30 DEG C of room temperature
Small, moisture loss amount is small, and the moisture fluctuation of compound is small, and the intensity of the pelletizing of preparation is effectively ensured；
3. in the balling stage of the inventive method, pelletizer rotating speed is in the range of 25.5~30.2r/min, and inclination angle is at 43 °
In the range of~47 °, balling-up efficiency is optimal, and makes the loss control of compound in minimum zone；
4. in the pelletizing drying stage of the inventive method, heated up, be warming up to by 5~10 DEG C/min heating rate
105~110 DEG C, and 2~3h is incubated, it is incubated after terminating, the drying system to be cooled by 5~10 DEG C/min rate of temperature fall
Under, drying time shortens, and pelletizing surface is complete, and the compression strength of pelletizing reaches preferable level after drying；
5. in the firing stage of the inventive method, first it is warming up to 800~900 DEG C by 10~12 DEG C/min heating rate
Afterwards, then by 4~6 DEG C/min heating rate 1150~1200 DEG C are warming up to, roasting time is 15~20min, with other pelletizings
Roasting 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 is maintained at
In the range of 2451~3403N, the production efficiency of high-chromic vanadium-titanium ferroferrite pelletizing is significantly improved, and saves the energy, is reduced
Cost；
6. high-chromic vanadium-titanium ferroferrite pelletizing made from the inventive method, low-temperature reduction disintegration rate RDI+3.1591.5~
In the range of 93.2%, much larger than 65% required by standard, RSI is in the range of 7.8~8.1% for reduction swellability rate, reduction swellability
Rate is small；For reproducibility RI in the range of 69.35~74%, reproducibility is high；Soften start temperature in the range of 1145~1153 DEG C, it is soft
Change in the range of 1278~1283 DEG C of end temp, pressure difference skyrockets temperature in the range of 1315~1320 DEG C, and drippage temperature is 1556
In the range of~1559 DEG C, in the range of 130~138 DEG C of softening temperature section, reflowing temperature section is soft in 240~244 DEG C of sections
Melting temperatur is high, and soft heat section is narrow, so high-chromic vanadium-titanium ferroferrite pelletizing carries good gas permeability in soft melting dropping, and
Melt-dropping property is preferable.Therefore the pelletizing for the high-chromic vanadium-titanium ferroferrite preparation for climbing western red lattice area is suitable as iron-smelting raw material.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the preparation method of high-chromic vanadium-titanium ferroferrite pelletizing of the present invention；
Fig. 2 show the electron microscope of high-chromic vanadium-titanium ferroferrite particle in the inventive method.
Fig. 3 is X-ray diffraction (XRD) collection of illustrative plates of the pelletizing of the inventive method preparation at different temperatures.
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 the red lattice area high-chromic vanadium-titanium ferroferrite of Panxi, Sichuan,
Its main component excursion is respectively by weight percentage：TFe contents are that 50%~58%, FeO contents are 25%~30%,
Cr2O3Content is 0.5%~1.2%, V2O5Content is 0.5%~1.5%, TiO2Content is 5%~12.6%, and content of MgO is
2%~4%, Al2O3Content is 2.2%~3.2%, and CaO content is 0.5%~1%, SiO2Content is 2.2%~5%, surplus
For inevitable impurity.
The size distribution of high-chromic vanadium-titanium ferroferrite is surveyed according to GB/T10322.7-2004 standards in the embodiment of the present invention
It is fixed.
The compression strength of high-chromic vanadium-titanium ferroferrite pelletizing is come according to GB/T14201-1993 standards in the embodiment of the present invention
Measure.
High-chromic vanadium-titanium ferroferrite low temperature reduction degradation index comes according to GB/T13242-1991 standards in the embodiment of the present invention
Measure.
High-chromic vanadium-titanium ferroferrite reduction swellability index is surveyed using GB/T13240-1991 standards in the embodiment of the present invention
It is fixed.
High-chromic vanadium-titanium ferroferrite reproducibility measure is surveyed using GB/T13241-1991 standards in the embodiment of the present invention
It is fixed.
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 preparation method of high-chromic vanadium-titanium ferroferrite pelletizing, with reference to shown in figure 1, this method includes：
1. raw material drying
High-chromic vanadium-titanium ferroferrite is dried in drying box processing, drying temperature is 105~108 DEG C, when drying
Between be 4~4.5h, make high-chromic vanadium-titanium ferroferrite moisture be less than or equal to 1.4%.
The moisture of high-chromic vanadium-titanium ferroferrite powder is crystal water content in 1.2%~1.4% this scope after testing, is exceeded
The scope for Free water；To avoid the dry-mixed effect of free water effect, as bentonite absorbs the water in high-chromic vanadium-titanium ferroferrite
It can reunite together after point and reduce the Blending Efficiency of Blending with high-chromic vanadium-titanium ferroferrite；Simultaneously during wet mixing to be guarantee
Accurate adjustment moisture, the moisture in high-chromic vanadium-titanium ferroferrite is avoided to influence the actual moisture in expecting after wet mixing, therefore,
The moisture of high-chromic vanadium-titanium ferroferrite is controlled≤1.4%.
Drying process can remove the Free water of high-chromic vanadium-titanium ferroferrite so that high-chromic vanadium-titanium ferroferrite internal structure
It is finer and close, the intensity of high-chromic vanadium-titanium ferroferrite is improved, and the viscosity of high-chromic vanadium-titanium ferroferrite can also be reduced, just
In pelletizing, while the temperature of calcination process can also be reduced, save the energy.
Large particle surface is relatively smooth in the high-chromic vanadium-titanium ferroferrite used in the present invention, partial particulate rough surface,
And there is sharp-featured feature, be illustrated in figure 2 the electron microscope of high-chromic vanadium-titanium ferroferrite particle in the inventive method, should
Figure be in accelerating potential (EHT)=15.00kV, secondary electron detectable signal SignalA=SE2, operating distance (WD)=
Obtained under conditions of 8.9mm, multiplication factor (Mag)=10.00KX.Using the method for wet screening to high-chromic vanadium titanium magnetic after drying
Iron ore carries out particle size distribution measurement, is found through lot of experiments, when particle diameter accounting for less than 75 μm in high-chromic vanadium-titanium ferroferrite
During than in the range of 70%~75%, pellet strength is optimal value, can be used as pelletizing raw material；Otherwise need to high-chromic vanadium titanium
Magnetic iron ore carries out pre-grinding processing so that in the high-chromic vanadium-titanium ferroferrite in raw material accounting of the particle diameter less than 75 μm 70%~
In the range of 75%.
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, will to the particle diameter of high-chromic vanadium-titanium ferroferrite
It is controlled by.
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 10~15min, its
The calcium-base bentonite of middle addition accounts for the 0.8~1.4% of high-chromic vanadium-titanium ferroferrite weight.Found through lot of experiments, when swollen
Moisten native addition less than 0.8% when, the cohesiveness of pelletizing compound and balling-up are poor, and higher than 1.4% when, because moisture is swollen
Profit soil absorbs, and can not be expressed into pelletizing surface in time in balling process, causes balling ratio and balling-up speed to decline, therefore, this
The content of bentonite addition in invention is selected in 0.8%~1.4%.Preferably, the bentonite can also be hydrogen-based bentonite or
The binding agents such as 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 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, water is sprayed with uniform speed and flow
Uniformly drenched on high-chromic vanadium-titanium ferroferrite, making high-chromic vanadium-titanium ferroferrite.Wherein, water-spraying amount is high-chromic vanadium titanium magnetic
The 6.5~12% of iron ore gross weight, the time of wet mixing is 10~15min.Show through lot of experiments, the water-spraying amount is low
When 6.5%, compound is caused to accumulate on kick back, balling ratio and balling-up speed decline；And water-spraying amount be higher than 12% 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 the pelletizing speed of growth and balling ratio, therefore water-spraying amount is selected in 6.5~12%.
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 25.5~30.2r/min, and inclination angle is 43~47 °, and total Balling time is 20~30min.When rotating speed is less than
During 25.5r/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 when rotating speed is higher than 30.2r/min, the compound newly added can be accumulated on scraper plate because speed is excessive, is reduced and mother
The contacting efficiency of ball, and reduce mother bulb coarsening rate.When inclination angle is less than 43 °, the less material of granularity can be caused to accumulate in whole
The bottom of body pelletizing, mother bulb growth rate slow down, and reduce the production efficiency of pelletizing；And when inclination angle is more than 47 °, it can reduce and make
The filling rate of ball machine, if filling rate is too small, the production efficiency of pelletizing can be reduced.Therefore, the parameter of pelletizer is elected rotating speed as and existed
In the range of 25.5~30.2r/min, inclination angle improves pellet quality in the range of 43 °~47 °, and balling-up efficiency is optimal, and mixed
The loss control of material is closed 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 cool
When 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 pelletizing
Rupture.Drying pelletizing compression strength within this range can reach 36~45N/ simultaneously, higher than general V-ti Bearing Magnetite Pellets
Compression strength after drying process.Therefore, heating rate is selected in the range of 5~10 DEG C/min, rate of temperature fall be selected in 5~10 DEG C/
In the range of min, drying time is short, and pelletizing surface is complete, and the compression strength of pelletizing reaches preferable level, balling ratio after drying
It can reach more than 95%.
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 program
Control, 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 pelletizing
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 is 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 1150~1200 DEG C, roasting time is 15~20min, after roasting terminates, is cooled by 5~8 DEG C/min rate of temperature fall,
Etc. taking out after being down to 300 DEG C, air cooling is carried out, high-chromic vanadium-titanium ferroferrite pelletizing is made.Compared with other pellet roasting technologies, nothing
Need to preheat, sintering temperature is relatively low, the time is short, can reach the requirement of ripe ball compression strength, and is maintained at 2451~3403N scopes
It is interior, the production efficiency of high-chromic vanadium-titanium ferroferrite pelletizing is significantly improved, and the energy is saved, reduce 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 91.5~93.2%, much larger than 65% required by standard；Reduce swollen
Swollen rate RSI shows that reduction swellability rate is small in the range of 7.8~8.1%；Reproducibility RI shows also in the range of 69.35~74%
Originality is high；Soften start temperature in the range of 1145~1153 DEG C, soften in the range of 1278~1283 DEG C of end temp, pressure difference is steep
Temperature is risen in the range of 1315~1320 DEG C, drippage temperature is in the range of 1556~1559 DEG C, softening temperature section 130~138
In the range of DEG C, reflowing temperature section is in 240~244 DEG C of sections, and reflowing temperature is high, and soft heat section is narrow, above-mentioned to measure
Metallurgical performance meets preferably metallurgical performance.Wherein, preferably the index of metallurgical performance includes low temperature reduction degradation index RDI+3.15
More than 65%, reduction swellability rate RSI is less than 15%, and reproducibility RI is more than 60%, and soft heat section is narrow and less than 250 DEG C.
8. thing mutually detects
Oven test under different temperatures is carried out to dried pelletizing, then using X-ray diffraction (XRD) respectively to not
Pelletizing under synthermal is detected, to obtain valuable element Fe, Ti, Cr and V element phase transition process.As shown in figure 3,
High-chromic vanadium-titanium ferroferrite pelletizing X-ray diffraction (XRD) collection of illustrative plates at different temperatures prepared for the inventive method, by thing
Facies analysis understands that the phase transition process of element includes Fe3O4→Fe2O3；FeTiO3And Fe2.75Ti0.25O4→Fe2Ti3O9→
Fe2TiO5；Fe2VO4→Fe2.5V7.5O16→V1.93Cr0.07O3(Cr0.05V0.95)2O3；FeCr2O4→(Cr0.05V0.95)2O3, it is
High-chromic vanadium-titanium ferroferrite provides foundation and reference in ironmaking production application.
Embodiment 2
A kind of preparation method of high-chromic vanadium-titanium ferroferrite pelletizing, the present embodiment are the specific behaviour on the basis of embodiment 1
It is as follows to make step：
1. raw material drying
5kg high-chromic vanadium-titanium ferroferrites are taken, it are dried in drying box processing, drying temperature is 108 DEG C, is dried
Time is 4h, and the water content that high-chromic vanadium-titanium ferroferrite is measured after drying is 1.2%.
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, wherein
The calcium-base bentonite of addition accounts for the 0.9% of high-chromic vanadium-titanium ferroferrite weight.
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 gross weight, wet mixing time are 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 28r/min, inclination angle is 45 °, and total Balling time is 26min.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 37N/, 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 2854N 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 91.65%；Reduction swellability rate RSI
For 7.98%；Reproducibility RI is 69.56%；It is 1148 DEG C to soften start temperature, and softening end temp is 1280 DEG C, and pressure difference skyrockets
Temperature is 1316 DEG C, and drippage temperature is 1556 DEG C, and softening temperature section is 132 DEG C, and reflowing temperature section is 240 DEG C.As a result table
Bright pelletizing metallurgical performance numerical value manufactured in the present embodiment can be used as iron-smelting raw material preferably in numerical intervals.
Embodiment 3
The present embodiment is that concrete operations are as follows on the basis of embodiment 1：
1. raw material drying
5kg high-chromic vanadium-titanium ferroferrites are taken, it are dried in drying box processing, drying temperature is 106 DEG C, is dried
Time is 4.5h, and the water content that high-chromic vanadium-titanium ferroferrite is measured after drying is 1.22%.
2. mixing step
Hydrogen-based bentonite is added in high-chromic vanadium-titanium ferroferrite and carries out dry blending process, the dry-mixed time is 12min, wherein
The calcium-base bentonite of addition accounts for the 1.1% of high-chromic vanadium-titanium ferroferrite weight.
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 8.5% of iron ore 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 30r/min, inclination angle is 46 °, and total Balling time is 28min.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
108 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 38N/, balling ratio 96%.
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 1168 DEG C, roasting time 16min 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, 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 2763N 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 92.5%；Reduction swellability rate RSI is
8.05%；Reproducibility RI is 70.28%；It is 1146 DEG C to soften start temperature, and softening end temp is 1279 DEG C, and pressure difference skyrockets temperature
Spend for 1315 DEG C, drippage temperature is 1557 DEG C, and softening temperature section is 133 DEG C, and reflowing temperature section is 242 DEG C, the results showed that
Metallurgical performance numerical value can be used as iron-smelting raw material preferably in numerical intervals.
Embodiment 4
The present embodiment is that concrete operations are as follows on the basis of embodiment 1：
1. raw material drying
5kg high-chromic vanadium-titanium ferroferrites are taken, it are dried in drying box processing, drying temperature is 105 DEG C, is dried
Time is 4.2h, and the water content that high-chromic vanadium-titanium ferroferrite is measured after drying is 1.28%.
2. mixing step
Organobentonite is added in high-chromic vanadium-titanium ferroferrite and carries out dry blending process, the dry-mixed time is 15min, wherein
The organobentonite of addition accounts for the 1.4% of high-chromic vanadium-titanium ferroferrite weight.
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 9% of iron ore gross weight, wet mixing time are 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 30 DEG C of insulating box
The stewing material of row, it is 35min 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 29r/min, inclination angle is 47 °, and total Balling time is 30min.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
110 DEG C, and it is incubated 2.4h；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 43N/, balling ratio 98%.
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 1150 DEG C are warming up to by 6 DEG C/min heating rate, roasting time 20min；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 92.8%；Reduction swellability rate RSI is
7.9%；Reproducibility RI is 71.45%；It is 1149 DEG C to soften start temperature, and softening end temp is 1283 DEG C, and pressure difference skyrockets temperature
Spend for 1318 DEG C, drippage temperature is 1559 DEG C, and softening temperature section is 134 DEG C, and reflowing temperature section is 241 DEG C, the results showed that
Metallurgical performance numerical value can be used as iron-smelting raw material preferably in numerical intervals.
Embodiment 5
The present embodiment is that concrete operations are as follows on the basis of embodiment 1：
1. raw material drying
5kg high-chromic vanadium-titanium ferroferrites are taken, it are dried in drying box processing, drying temperature is 109 DEG C, is dried
Time is 4.4h, and the water content that high-chromic vanadium-titanium ferroferrite is measured after drying is 1.3%.
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 13min, wherein
The calcium-base bentonite of addition accounts for the 1.1% of high-chromic vanadium-titanium ferroferrite weight.
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 8.5% of iron ore gross weight, wet mixing time are 13min.
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 30min 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 30r/min, inclination angle is 46 °, and total Balling time is 30min.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 41N/, 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 880 DEG C, 1190 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 3351N 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 93.1%；Reduction swellability rate RSI is
8.0%；Reproducibility RI is 73.2%；It is 1152 DEG C to soften start temperature, and softening end temp is 1282 DEG C, and pressure difference skyrockets temperature
For 1316 DEG C, drippage temperature is 1559 DEG C, and softening temperature section is 130 DEG C, and reflowing temperature section is 243 DEG C, the results showed that smelting
Golden performance value can be used as iron-smelting raw material preferably in numerical intervals.
Comparative example
Pelletizing is prepared using prior art, with reference to existing patent publication No. be a kind of vanadium-titanium pellets of CN104862472A and
Prepared by its preparation method, carried out, specifically included using method in embodiment 1：Take 10kg high-chromic vanadium-titanium ferroferrites and
0.2kg calcium-base bentonites, which load, carries out batch mixing 10min in batch mixer, then be put into moisten compound in horizontal ball mill and grind
60min, then utilize disc balling machine (rotating speed 23r/min, 46 ° of inclination angle) pelletizing, total time 5min.Then green-ball is put into
In drying box, drying box parameter is that initial temperature is 200 DEG C, rises to 450 DEG C with 3 DEG C/min heating rate and is incubated 5min.
It is then placed in Muffle furnace and 12min is preheated at 900 DEG C, then preheated pelletizing is put into 1200 DEG C of tube furnace and is calcined
20min, finally obtain ripe ball.
According to the pelletizing preparation method in above-mentioned document, the relatively low balling ratio of high-chromic vanadium-titanium ferroferrite pelletizing is 32%,
Pelletizing compression strength after the completion of drying is 24N/, and the pelletizing compression strength after the completion of roasting is 2135N.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
62.7%；It is 1162 DEG C to soften start temperature, and softening end temp is 1305 DEG C, and pressure difference skyrockets temperature as 1301 DEG C, drippage temperature
Spend for 1542 DEG C, softening temperature section is 143 DEG C, and reflowing temperature section is 241 DEG C.By the preparation method of prior art, as a result
Illustrating that its balling-up is poor, 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 have a great influence, reduce low-temperature reduction disintegration rate and reproducibility, improve reduction swellability rate, as a result illustrate low
Warm metallurgical performance is deteriorated.
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 preparation method of high-chromic vanadium-titanium ferroferrite pelletizing, it is characterised in that it includes：
Raw material drying：High-chromic vanadium-titanium ferroferrite is dried, its moisture is less than or equal to 1.4%；
Mixing step：By the dried high-chromic vanadium-titanium ferroferrite and the dry-mixed 10~15min of bentonite, wet mixing of spraying water afterwards
10~15min；
The stewing material stage：Raw material after the wet mixing is placed in 25~30 DEG C of constant temperature and carries out 30~35min of stewing material；
Balling stage：Raw material after the stewing material is put into the green-ball that a diameter of 10~12.5mm is prepared in pelletizer；
Pelletizing drying stage：The green-ball is put into drying box, heated up by 5~10 DEG C/min heating rate, is heated up
To 2~3h of insulation at 105~110 DEG C；Afterwards, cooled by 5~10 DEG C/min rate of temperature fall；
Firing stage：The dried green-ball is calcined, pelletizing is warming up to by 10~12 DEG C/min heating rate
800~900 DEG C；Then, 1150~1200 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, carry out air cooling, high-chromic vanadium-titanium ferroferrite is made
Pelletizing.
2. the method as described in claim 1, it is characterised in that the TFe contents in the high-chromic vanadium-titanium ferroferrite are 50%
~58%, FeO content are 25%~30%, Cr2O3Content is 0.5%~1.2%, V2O5Content is 0.5%~1.5%, TiO2
Content is 5%~12.6%, and content of MgO is 2%~4%, Al2O3Content be 2.2%~3.2%, CaO content be 0.5%~
1%, SiO2Content is 2.2%~5%.
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%.
4. the method as described in claim 1, it is characterised in that the temperature of the raw material drying is 105~108 DEG C, when drying
Between be 4~4.5h.
5. the method as described in claim 1, it is characterised in that the bentonitic addition is the chromium type high v-ti magnetite
The 0.8~1.4% of ore deposit weight.
6. the method as described in claim 1 or 5, it is characterised in that the bentonite be calcium-base bentonite, hydrogen-based bentonite or
Organobentonite.
7. the method as described in claim 1, it is characterised in that the water-spraying amount in the wet mixing stage for it is described it is dry-mixed after height
The 6.5~12% of chromic vanadium-titanium ferroferrite gross weight.
8. the method as described in claim 1, it is characterised in that the balling stage prepares green-ball and comprised the following steps：Use water
The raw material is disperseed, after granulating, raw material is spread in water spray, when mother bulb diameter reaches 2~3mm, it is equal to leave granularity
Even 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~
The 2min uniform spreading in interval, when pelletizing diameter is in the range of 10~12.5mm, stopping spreading, pelletizer is rotated further 4~
Green-ball is obtained after 5min.
9. the method as described in claim 1 or 8, it is characterised in that the rotating speed of the pelletizer is set to 25.5~30.2r/
Min, inclination angle are set to 43~47 °.
10. method as claimed in any one of claims 1-9 wherein, it is characterised in that the roasting is using horizontal Muffle furnace, pelletizing
Roaster or high temperature sintering furnace.
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| CN109576490A (en) * | 2019-02-01 | 2019-04-05 | 东北大学 | A kind of method that additional calcium carbonate prepares high alkalinity full vanadium-titanium pellet containing chromium |
| CN109666790A (en) * | 2019-02-01 | 2019-04-23 | 东北大学 | A method of using calcium oxide prepare in the full vanadium titanium self fluxed pellet of low alkalinity |
| CN109852791A (en) * | 2019-02-01 | 2019-06-07 | 东北大学 | A method of high alkalinity pellet containing Cr-V-Ti is prepared using calcium oxide |
| CN109852790A (en) * | 2019-02-01 | 2019-06-07 | 东北大学 | A method of middle low alkalinity is prepared containing the full vanadium titanium self fluxed pellet of chromium |
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| CN108754133A (en) * | 2018-06-14 | 2018-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of high titanium solvent borne pelletizing of high chromium and the preparation method and application thereof |
| CN109576490A (en) * | 2019-02-01 | 2019-04-05 | 东北大学 | A kind of method that additional calcium carbonate prepares high alkalinity full vanadium-titanium pellet containing chromium |
| CN109666790A (en) * | 2019-02-01 | 2019-04-23 | 东北大学 | A method of using calcium oxide prepare in the full vanadium titanium self fluxed pellet of low alkalinity |
| CN109852791A (en) * | 2019-02-01 | 2019-06-07 | 东北大学 | A method of high alkalinity pellet containing Cr-V-Ti is prepared using calcium oxide |
| CN109852790A (en) * | 2019-02-01 | 2019-06-07 | 东北大学 | A method of middle low alkalinity is prepared containing the full vanadium titanium self fluxed pellet of chromium |
| CN109666790B (en) * | 2019-02-01 | 2020-04-14 | 东北大学 | Method for preparing full vanadium-titanium self-fluxing pellet with medium and low alkalinity by using calcium oxide |
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