CN107937714A - A kind of method that low chromium type vanadium titano-magnetite prepares sinter with addition of ilmenite - Google Patents
A kind of method that low chromium type vanadium titano-magnetite prepares sinter with addition of ilmenite Download PDFInfo
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- CN107937714A CN107937714A CN201711152270.4A CN201711152270A CN107937714A CN 107937714 A CN107937714 A CN 107937714A CN 201711152270 A CN201711152270 A CN 201711152270A CN 107937714 A CN107937714 A CN 107937714A
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- sintering
- sinter
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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
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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
- C22B1/16—Sintering; Agglomerating
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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
- 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
- C22B34/1204—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 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent
Abstract
A kind of method for preparing sinter with addition of ilmenite the present invention relates to low chromium type vanadium titano-magnetite, low chromium type vanadium-titanium magnitite sinter is prepared it discloses main using the raw materials such as low chromium type vanadium titano-magnetite, ilmenite progress batch mixing, stewing material, batch mixing, granulation, discharging, cloth, igniting, sintering, broken and screening.This method effectively prevent the non-uniform consequence of batch mixing such as caking as caused by other sintering methods, after stewing material, batch mixing again, ensure the uniformity of batch mixing, and sintering rate is improved, sintering time is reduced, significantly improves the production efficiency of low chromium type vanadium-titanium magnitite sinter, and the energy is saved, reduce cost；The low chromium type vanadium-titanium magnitite sinter of preparation carries good gas permeability in soft melting dropping, and melt-dropping property is preferable.This method provides theoretical foundation and technical foundation to be reasonable from now on to research of the low chromium type vanadium titano-magnetite in blast furnace process using low chromium type vanadium titano-magnetite and ilmenite.
Description
Technical field
The invention belongs to iron-smelting raw material production technology, and in particular to a kind of low chromium type vanadium titano-magnetite is prepared with addition of ilmenite
The method of sinter.
Background technology
The red lattice Bei Kuang in Sichuan belongs to a kind of low chromium, high-Ti type V-Ti magnet as the reserved resources of inland steel
Ore deposit.Wherein abundant titanium resource can be the titaniums such as production titanium slag, titanium sponge, synthetic rutile, titanium white, titanium alloy, titanium
Basic material is provided.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 mineral intergrowths, according to existing smelting technique, its comprehensive utilization ratio is poorly efficient, except iron resource
Utilization rate is higher, and as the titanium slag of byproduct, it is carried, and titanium rate is low and most of titanium slag is used to produce low value-added product.
On the one hand red lattice vanadium titano-magnetite disclosure satisfy that demand of the blast fumance to iron ore material, on the other hand, due to
Titanium, chromium and vanadium unit cellulose content in red lattice vanadium titano-magnetite is higher, can develop the titanium, vanadium, chromium product of high added value, improves iron ore
Utility value.Although low chromium type v-ti magnetite ore resources have started to exploit utilization on a small scale, because of its smelting technique not yet
Maturation, especially titanium resource utilization rate is low, and wasting of resources situation is serious.This not only directly results in red lattice low chromium type schreyerite synthesis
Utility value cannot be played effectively, and the waste residue such as titanium slag for abandoning of heap causes environment serious pollution.
In view of the importance of red lattice low chromium type v-ti magnetite ore resources, at home and abroad there is no be applied to blast furnace life at present
The technique of production, the technology smelted, ferrotianium ore resources and low chromium type vanadium titano-magnetite are particularly combined prepare sinter
Utilize, while the research to its sintering performance is still in blank, therefore, to red lattice low chromium type vanadium titano-magnetite with addition of ilmenite
The sinter of preparation, and will be rationally to utilize low chromium type vanadium titano-magnetite and ilmenite from now on to its research in blast furnace process
Theoretical foundation and technical foundation are provided.
Using the prior art prepare climb western red lattice low chromium type vanadium titano-magnetite with addition of ilmenite sinter when, granulation time
Long, effect is poor, and sintering material granularity is uneven, and the poor air permeability of sinter bed, sintering velocity is slow, is easily segregated in sintering process,
Yield rate is relatively low, and drum strength is less than mean level.Therefore, skill of the low chromium type vanadium titano-magnetite with addition of ilmenite production sinter
Art difficulty is larger.
In view of the importance of red lattice low chromium type v-ti magnetite ore resources, at home and abroad there is no be applied to blast furnace life at present
The technique of production, the technology smelted, ferrotianium ore resources and low chromium type vanadium titano-magnetite are particularly combined prepare sinter
Utilize, while the research to its sintering performance is still in blank, therefore, to red lattice low chromium type vanadium titano-magnetite with addition of ilmenite
The sinter of preparation, and will be rationally to utilize low chromium type vanadium titano-magnetite and ferrotianium from now on to its research in blast furnace process
Ore deposit, production titanium grade are high, and the measured titanium-containing blast furnace slag of matter provides theoretical foundation and technical foundation.
Using the prior art prepare climb western red lattice low chromium type vanadium titano-magnetite with addition of ilmenite sinter when, granulation time
Long, effect is poor, and sintering material granularity is uneven, and the poor air permeability of sinter bed, sintering velocity is slow, is easily segregated in sintering process,
Yield rate is relatively low, and drum strength is less than mean level.Therefore, skill of the low chromium type vanadium titano-magnetite with addition of ilmenite production sinter
Art difficulty is larger.
The content of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, the present invention provides a kind of low chromium type vanadium titano-magnetite with addition of ilmenite system
The method of standby sinter, it is raw material that the present invention, which selects and climbs western red lattice low chromium type vanadium titano-magnetite and ilmenite, in mixing process
Determine suitable water spray, mixing time and stewing material time；Suitable water spray, Granulation time, grain are determined in pelletization
Footpath scope and distributing mode improve the gas permeability of sintering process；Determine suitable exhausting pressure, improve red lattice low chromium type vanadium titanium
The sintering rate of magnetic iron ore, the segregation for reducing the sinter bed bed of material burn till rate improve sinter；When determining suitable sintering
Between and drop temperature so that sinter internal liquid phase fully develops, and improves the intensity index of sinter, obtains meeting blast furnace feeding
The sinter of quality standard.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include：
A kind of method that low chromium type vanadium titano-magnetite prepares sinter with addition of ilmenite, it includes the following steps：
S1, batch mixing：Low chromium type vanadium titano-magnetite, ilmenite, common magnetic iron ore, pulverized limestone, blast furnace dust, magnetic will be included
Select powder, return mine, the raw material of coke and coal dust carries out first time batch mixing, mixing process sprinkling spray water；After batch mixing stops, being boiled in a covered pot over a slow fire
Material, after boiling in a covered pot over a slow fire material, carries out second of batch mixing；
S2, granulation：The raw material mixed is pelletized, in pelletization, is sprayed into mixture and accounts for raw material gross weight
0.5~2.5% moisture, Granulation time are 5~15min, obtain the sintering ball material of low chromium type vanadium-titanium magnitite sinter；
S3, discharging：It is by reducing the rotating speed of granulator, the sintering ball material of size fractionated is suitable by from big to small
Sequence discharges, and the sintering ball material of size fractionated is loaded with different material receivers；
S4, cloth：Sintering ball material is descending by particle diameter, and cloth is on sintering machine from below to up, and in the superiors
Coke powder is uniformly spread as medium of igniting, overall thickness of feed layer is 720~820 mm；
S5, igniting：Light a fire and sinter on sintering machine, while open combustion fan start-up operation, the temperature of the igniting sintering
It is 950~1000 DEG C to spend the whole story, and the negative pressure of the igniting is 7~9kPa, and the time of the igniting is 1~2min；
S6, sintering：Down draft sintering is carried out after the completion of igniting, when exhaust gas temperature drops to 100~120 DEG C, sintering process
Terminate；
S7, crush：The step S6 sinters completed are crushed；
S8, screening：Sinter after the step S7 is crushed is sent into screening system, obtain grade be 5~40mm into
Product sinter.
Method as described above, it is preferable that the TFe contents in the low chromium type vanadium titano-magnetite are 50%~57%,
FeO contents are 23%~28%, TiO2Content is 10%~15%, Cr2O3Content is 0.3%~0.5%, V2O5Content is
0.3%~1.4%, CaO content is 0.8~1.5%, SiO2Content is 3.7~4.5%, Al2O3Content is 2.4~2.9%；Institute
It is that 30%~40%, FeO contents are 10%~15%, TiO to state the TFe contents in ilmenite2Content 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 the low chromium type vanadium titano-magnetite is 10~35 parts by weight, and the ilmenite is
15~20 parts by weight, the common magnetic iron ore are 25~30 parts by weight, and the pulverized limestone is 12~13 parts by weight, the State of Blast Furnace
Dirt is 0.5~1 parts by weight, and the magnetic separation is 0.5~1 parts by weight, described to return mine as 5~20 parts by weight, the coke and coal
Powder is 3~6.5 parts by weight.
Method as described above, it is preferable that the pulverized limestone is replaced with lime stone or/and white lime.
Method as described above, it is preferable that in step sl, the dosage of the sprinkling spray water is the 4 of raw material gross weight
~7.5%, the time of the first time batch mixing is 10~20min；The time of the stewing material is 8~15min, and described second mixed
The time of material is 10~25min.
Method as described above, it is preferable that in step s 2, in the pelletization, the moisture of sprinkling is spray water, institute
State ball material accounting 75~90% of the ball material granularity of sintering ball material in the range of 2~5mm.
Method as described above, it is preferable that in step s 4, the distributing mode is the sintering that grade is more than to 5mm
Ball material is distributed in the bottom of sintering machine, is then distributed the sintering ball material that grade is 3~4mm on it, is then distributed on it
Grade is the sintering ball material of 2~3mm, and sintering ball material of the grade less than 2mm finally is distributed in the top, the institute of the superiors
The thickness for stating coke powder is 0.5~1.5mm thickness.
Method as described above, it is preferable that in step s 5, the igniting is to utilize natural gas or liquefied petroleum gas or third
Alkane and air ignition.
Method as described above, it is preferable that in step s 6, the suction pressure control is in 10~12kPa.
Method as described above, it is preferable that described crush is to be crushed bulk sinter using single-tooth roller.
A kind of method for preparing sinter with addition of ilmenite the present invention provides low chromium type vanadium titano-magnetite, is primarily adapted for use in
The preparation of ore deposit is sintered using low chromium type vanadium titano-magnetite, the method for employing stewing material, is by spraying water in raw material for sintering
After batch mixing, stewing material is carried out to mixture, the mobility and uniformity of mixture can be strengthened, so as to avoid by other sintering sides
The non-uniform consequence of batch mixing such as caking caused by method, boils in a covered pot over a slow fire after expecting, again batch mixing, ensures the uniformity of batch mixing.
In the granulation link of the method for the present invention, pass through mixing time and sprinkling moisture so that ball material granularity 2~5mm scopes
Interior ball material accounting 75~90%, is so conducive to follow-up cloth link operation.
It is the bottom that sintering feed of the grade more than 5mm is distributed in sintering machine, then in the cloth stage of the method for the present invention
The sintered balls material that grade is 3~4mm is distributed on it, is then distributed the sintered balls material that grade is 2~3mm on it, finally will
Sintered balls material of the grade less than 2mm is distributed in the top, and uniformly spreads the coke powder of 0.5~1.5mm thickness as drawing in the superiors
Fiery medium, overall thickness of feed layer are 720~820mm, and this cloth can improve gas permeability of the sintering feed in sintering process
With the rate of burning till, the ball material for avoiding granularity larger is not grilled thoroughly and reduces the rate of burning till completely；In the cloth stage of the method for the present invention, burning
The coke powder of 0.5~1.5mm thickness uniformly spreads as medium of igniting in the superiors of ramming material, avoids loss of ignition.
In the ignition phase of the method for the present invention, by ignition device on sintering machine, while combustion fan is started to work,
The temperature whole story of igniting sintering is 950~1000 DEG C, and igniting negative pressure is 7~9 kPa, and the duration of ignition is 1~2min, with other burnings
Knot technology is compared, and firing temperature is low, reduces combustion gas cost.
In the sintering stage of the method for the present invention, suction pressure is 10~12kPa, the sintered discharge gas temperature in whole sintering process
Degree records in real time, and when exhaust gas temperature drops to 100~120 DEG C, sintering process terminates, and down draft sintering equipment is stopped, with
Other sintering technologies are compared, and improve sintering rate, reduce sintering time, significantly improve the life of low chromium type vanadium-titanium magnitite sinter
Efficiency is produced, and saves the energy, reduces cost.
(3) beneficial effect
The beneficial effects of the invention are as follows：
The method of the present invention, with addition of low chromium type vanadium-titanium magnitite sinter made from ilmenite, burns till rate using low chromium type vanadium titano-magnetite
82~93%, drum strength is in the range of 57~72%；Low-temperature reduction disintegration rate RDI+3.15In the range of 82~95%；Also
For originality RI in the range of 65~78%, reproducibility is high；Soften start temperature in the range of 1123~1138 DEG C, soften end temp
In the range of 1235~1272 DEG C, pressure difference skyrockets temperature in the range of 1310~1330 DEG C, and drippage temperature is in 1415~1480 DEG C of models
In enclosing, in the range of 97~151 DEG C of softening temperature section, in 85~170 DEG C of sections, reflowing temperature is high in reflowing temperature section, and
And soft heat section is narrow, so obtained low chromium type vanadium-titanium magnitite sinter carries good gas permeability, and melt-dropping property in soft melting dropping
Preferably.The soft slag melted after dripping and iron are subjected to molten point of experiment, the slag iron after molten divide is subjected to chemical analysis, measures the recycling of Fe
Rate is in the range of 95.6%~97.8%, and the rate of recovery of Ti is in the range of 96.2%~98.4%.The method of the present invention is to low chromium
Research of the type vanadium titano-magnetite in blast furnace process provides theory to be reasonable from now on using low chromium type vanadium titano-magnetite and ilmenite
Foundation and technical foundation.
Brief description of the drawings
Sintering process figures of the Fig. 1 for low chromium type vanadium titano-magnetite in the method for the present invention embodiment 1 with addition of ilmenite.
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 low chromium type vanadium titano-magnetite that the embodiment of the present invention is selected is the red lattice area low chromium type vanadium titano-magnetite of Panxi, Sichuan,
Its main component excursion is respectively by weight percentage：TFe contents be 50%~57%, FeO contents be 23%~
28%, TiO2Content is 10%~15%, Cr2O3Content is 0.3%~0.5%, V2O5Content contains for 0.3%~1.4%, CaO
Measure as 0.8~1.5%, SiO2Content is 3.7~4.5%, Al2O3Content is 2.4~2.9%.In order to utilize the low chromium in red lattice area
Type vanadium titano-magnetite is raw material, prepares the sinter of higher quality, through lot of experiments, finally determine to select ilmenite,
Common magnetic iron ore, pulverized limestone, blast furnace dust, magnetic separation, return mine, coke and coal dust these raw materials carry out preparing sinter.Wherein
In order to effectively improve the utilization of the iron of sinter, and the utilization rate of titanium, determined through many experiments in selected ilmenite
Main component：TFe contents are that 30%~40%, FeO contents are 10%~15%, TiO2Content is 45%~55%, CaO content
For 0.5~1.0%, SiO2Content is 5~6%, Al2O3Content is 0.5~1.0%.The titanium grade of one side ilmenite is high, can
As the raw material for providing titanium, another aspect ilmenite is as a kind of iron ore deposit, during sinter is prepared, with general iron
Ore deposit has similar characteristic, therefore rational influence of the ilmenite additive amount to sintering process is smaller.
Fuel is mainly played using coke and coal in the present invention.But coke is preferable as fuel, combustibility；And
Burning of coal performance is slightly poorer to coke, but the cost of coal is relatively low, and therefore, the method that can use coke coal blending, ensures preferably combustion
Cost and the usage amount of coke are reduced while burning performance；When coke matches somebody with somebody coal, when burnt ratio somewhat improves, sinter
Sintering process and intensity can make moderate progress, and coke and coal can be controlled in 5% or so, if too high, easily cause sinter burning
Burning during knot, the reducing property of sinter decline.
Return mine and refer to that finished product sinter granularity does not meet part of the blast furnace to the granularity requirements of sinter, and its Iron grade with
Sinter is suitable.Iron resource can be used as to recycle in sinter is prepared, reduce the consumption of lime and iron ore, improve money
Source utilization rate, reduces the pollution to environment；But when preparing sinter in the methods of the invention, by returning mine with addition of certain
The pellet performance of vanadium titano-magnetite can be improved, can so make the even particle size distribution of raw materials for sintering, improves the ventilative of sintering process
Property.
It is to adjust the basicity of sinter that quick lime, lime stone or white lime main purpose are added in mixing process, is improved
The metallurgical performance of low chromium type schreyerite.Blast furnace dust and magnetic separation are the waste materials produced in steel plant's production process, since it contains
There are certain Iron grade and phosphorus content, harmful components are few, can be sharp using resource reclaim in the preparation of sinter, is played by it
With with solve the problems, such as waste from stacking and mitigate soil pollution.
The drum strength of low chromium type vanadium-titanium magnitite sinter is measured according to GB8209-87 standards in the embodiment of the present invention.
The reproducibility of low chromium type vanadium-titanium magnitite sinter is measured according to GB/T13241-91 standards in the embodiment of the present invention.
The low temperature reduction degradation index of low chromium type vanadium-titanium magnitite sinter is according to GB/T13242-1991 standards in the embodiment of the present invention
To measure.
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 low chromium type vanadium titano-magnetite prepares sinter with addition of ilmenite, as shown in Figure 1, this method includes：
1. batch mixing
Materials will be sintered according to red lattice low chromium type vanadium titano-magnetite 33kg, ilmenite 15kg, common magnetic iron ore 25kg, blast furnace
Stove dirt 1kg, magnetic separation 1kg, return mine 5kg, pulverized limestone 15kg, and coke accounts for the 2.5kg of gross weight, and coal dust accounts for the 2.5kg of gross weight.By upper
State dispensing and weigh raw material, be put into batch mixer and carry out mixed ore deposit, in mixing process, sprinkling spray water accounts for raw material gross weight
After 4.2%, mixing time 10min, batch mixer capping is subjected to stewing material, boils in a covered pot over a slow fire material 8min, after boiling in a covered pot over a slow fire material, continues batch mixing 10min.
2. granulation
The raw material mixed is poured into drum pelletizer and starts to pelletize, in pelletization, sprinkling spray water accounts for raw material
The 0.6% of gross weight, to ensure the uniformity of sprinkling moisture, spraying state is adjusted to by fountain head, pelletize 5min, obtains low chromium
The sintering ball material of type vanadium-titanium magnitite sinter；Wherein, ball material accounting 83% of the ball material granularity in the range of 2~5mm.
3. discharging
After granulation, the speed of granulator is reduced to 10r/min, will<2mm, 2~3mm, 3~4mm,>5mm grades
Ball material, is respectively put into different containers.
4. cloth
By sintered balls material cloth on sintering machine, sintering feed of the grade more than 5mm is distributed in the bottom of sintering machine, then
The sintered balls material that grade is 3~4mm is distributed on it, is then distributed the sintered balls material that grade is 2~3mm on it, finally will
Sintered balls material of the grade less than 2mm is distributed in the top, and uniformly spreads the coke powder of 0.8mm thickness as Jie that ignites in the superiors
Matter, overall thickness of feed layer are 730mm.
5. igniting
Light a fire and sinter on sintering machine, while combustion fan is started to work, the temperature whole story for sintering of lighting a fire is 1000 DEG C, point
Fiery negative pressure is 7kPa, and duration of ignition 2min, is lighted a fire with liquefied petroleum gas and air.
6. sintering
Down draft sintering equipment is started to work after the completion of igniting, suction pressure 10kPa, and the sintering in whole sintering process gives up
Temperature degree records in real time, and when exhaust gas temperature drops to 100 DEG C, sintering process terminates, and down draft sintering equipment is stopped.
It is 7. broken
Sintering process terminates, and cleaner and single-tooth roller are started to work, and sinter enters monodentate roller apparatus by sintering machine, into
Enter the screening stage after broken.
8. screening
Sinter after broken is sent into screening system, obtains the finished product sinter that grade is 5~40mm, burns till rate
83.5%.
9. performance detection
By by existing standard and experimental method, the low chromium type vanadium-titanium magnitite sinter performance prepared to the present embodiment into
Row experiment, measures drum strength as 62%；Low-temperature reduction disintegration rate RDI+3.15For 86%, low-temperature reduction disintegration can be preferably；
Reproducibility RI is 67%, shows that reproducibility is preferable；It is in the range of 1126 DEG C to soften start temperature, and softening end temp is 1235
DEG C, pressure difference skyrockets temperature as 1314 DEG C, and drippage temperature is 1418 DEG C, and softening temperature is 109 DEG C, and reflowing temperature is 104 DEG C, its is soft
Melting temperatur is high, and soft heat section is narrow.The result shows that the low chromium type vanadium-titanium magnitite sinter of acquisition carries well saturating in soft melting dropping
Gas, and melt-dropping property is preferable, has preferably metallurgical performance.Wherein, preferably the index of metallurgical performance includes low-temperature reduction
Pulverization rate RDI+3.15More than 65%, reproducibility RI is more than 60%, and soft heat section is narrow and less than 250 DEG C.By the soft slag melted after dripping
Molten point of experiment is carried out with iron, the slag iron after molten point is subjected to chemical analysis, the rate of recovery for measuring Fe is the rate of recovery of 95.6%, Ti
For 96.2%.While iron-smelting raw material can be used as, the rate of recovery of Ti is also improved.
Embodiment 2
A kind of method that low chromium type vanadium titano-magnetite prepares sinter with addition of ilmenite, the present embodiment are in embodiment 1
On the basis of, concrete operation step is as follows：
1. batch mixing
It is high according to red lattice low chromium type vanadium titano-magnetite 14.6kg, ilmenite 16kg, common magnetic iron ore 30kg that materials will be sintered
Stove stove dirt 1kg, magnetic separation 0.5kg, return mine 20kg, and 12.4 kg of pulverized limestone, coke accounts for the 2.5kg of gross weight, and coal dust accounts for gross weight
2.5kg.Raw material is weighed by above-mentioned dispensing, is put into batch mixer and carries out mixed ore deposit, in mixing process, it is total that sprinkling spray water accounts for raw material
The 5.5% of weight, mixing time 12min, boils in a covered pot over a slow fire material 10min, continues batch mixing 12min.
2. granulation
The raw material mixed is poured into drum pelletizer and starts to pelletize, in pelletization, sprinkling spray water accounts for raw material
The 2.2% of gross weight, pelletize 7min, obtains the sintering ball material of low chromium type vanadium-titanium magnitite sinter；Wherein, ball material granularity is in 2~5mm
In the range of ball material accounting 87%.
3. discharging
After granulation, the speed of granulator is reduced to 10r/min, will<2mm, 2~3mm, 3~4mm,>5mm grades
Ball material, is respectively put into different containers.
4. cloth
By sintered balls material cloth on sintering machine, sintering feed of the grade more than 5mm is distributed in the bottom of sintering machine, then
The sintered balls material that grade is 3~4mm is distributed on it, is then distributed the sintered balls material that grade is 2~3mm on it, finally will
Sintered balls material of the grade less than 2mm is distributed in the top, and uniformly spreads the coke powder of 1mm thickness as medium of igniting in the superiors,
Overall thickness of feed layer is 750mm.
5. igniting
Light a fire and sinter on sintering machine, while combustion fan is started to work, the temperature whole story for sintering of lighting a fire is 960 DEG C, point
Fiery negative pressure is 7.5kPa, and duration of ignition 2.5min, is lighted a fire with natural gas and air.
6. sintering
Down draft sintering equipment is started to work after the completion of igniting, suction pressure 10.2kPa, the sintering in whole sintering process
Exhaust gas temperature records in real time, and when exhaust gas temperature drops to 100 DEG C, sintering process terminates, and down draft sintering equipment is stopped.
It is 7. broken
Sintering process terminates, and cleaner and single-tooth roller are started to work, and sinter enters monodentate roller apparatus by sintering machine, into
Enter the screening stage after broken.
8. screening
Sinter after broken is sent into screening system, obtains the finished product sinter that grade is 5~40mm, burns till rate
87.2%.
9. performance detection
By by existing standard and experimental method, the low chromium type vanadium-titanium magnitite sinter performance prepared to the present embodiment into
Row experiment, measures drum strength as 59%；Low-temperature reduction disintegration rate RDI+3.15For 82%, low-temperature reduction disintegration can be preferably；
Reproducibility RI is 72%, shows that reproducibility is preferable；It is in the range of 1123 DEG C to soften start temperature, and softening end temp is 1240
DEG C, pressure difference skyrockets temperature in the range of 1315 DEG C, and drippage temperature is 1425 DEG C, and softening temperature is 117 DEG C, reflowing temperature 110
DEG C, reflowing temperature is high, and soft heat section is narrow.The soft slag melted after dripping and iron are subjected to molten point of experiment, by the slag iron after molten divide
Chemical analysis is carried out, the rate of recovery that the rate of recovery for measuring Fe is 95.8%, Ti is 96.7%.While iron-smelting raw material can be used as,
The rate of recovery of Ti is also improved.The result shows that the low chromium type vanadium-titanium magnitite sinter of acquisition carries well saturating in soft melting dropping
Gas, and melt-dropping property is preferable, has preferably metallurgical performance.
Embodiment 3
The present embodiment is that concrete operations are as follows on the basis of embodiment 1：
1. batch mixing
Will sintering materials according to red lattice low chromium type vanadium titano-magnetite 14.9kg, ilmenite 15.3kg, common magnetic iron ore 30kg,
Blast furnace dust 0.8kg, magnetic separation 0.7kg, return mine 20kg, and pulverized limestone 12.8kg, coke accounts for the 2.4kg of gross weight, and coal dust accounts for gross weight
2.6kg.Raw material is weighed by above-mentioned dispensing, is put into batch mixer and carries out mixed ore deposit, in mixing process, sprinkling spray water accounts for total original
Expect 5.8%, mixing time 15min of weight, boil in a covered pot over a slow fire material 10min, continue batch mixing 14min.
2. granulation
The raw material mixed is poured into drum pelletizer and starts to pelletize, in pelletization, sprinkling spray water accounts for raw material
The 2.2% of gross weight, pelletize 8min, obtains the sintering ball material of low chromium type vanadium-titanium magnitite sinter；Wherein, ball material granularity is in 2~5mm
In the range of ball material accounting 89%.
3. discharging
After granulation, the speed of granulator is reduced to 10r/min, will<2mm, 2~3mm, 3~4mm,>5mm grades
Ball material, is respectively put into different containers.
4. cloth
By sintered balls material cloth on sintering machine, sintering feed of the grade more than 5mm is distributed in the bottom of sintering machine, then
The sintered balls material that grade is 3~4mm is distributed on it, is then distributed the sintered balls material that grade is 2~3mm on it, finally will
Sintered balls material of the grade less than 2mm is distributed in the top, and uniformly spreads the coke powder of 1.2mm thickness as Jie that ignites in the superiors
Matter, overall thickness of feed layer are 780mm.
5. igniting
Light a fire and sinter on sintering machine, while combustion fan is started to work, the temperature whole story for sintering of lighting a fire is 970 DEG C, point
Fiery negative pressure is 8.5kPa, and duration of ignition 2.4min, is lighted a fire using propane and air.
6. sintering
Down draft sintering equipment is started to work after the completion of igniting, suction pressure 10.4kPa, the sintering in whole sintering process
Exhaust gas temperature records in real time, and when exhaust gas temperature drops to 102 DEG C, sintering process terminates, and down draft sintering equipment is stopped.
It is 7. broken
Sintering process terminates, and cleaner and single-tooth roller are started to work, and sinter enters monodentate roller apparatus by sintering machine, into
Enter the screening stage after broken.
8. screening
Sinter after broken is sent into screening system, obtains the finished product sinter that grade is 5~40mm, burns till rate 87%.
9. performance detection
By by existing standard and experimental method, the low chromium type vanadium-titanium magnitite sinter performance prepared to the present embodiment into
Row experiment, measures drum strength as 62%；Low-temperature reduction disintegration rate RDI+3.15For 82%, low-temperature reduction disintegration can be preferably；
Reproducibility RI is 66%, shows that reproducibility is preferable；It is 1125 DEG C to soften start temperature, and softening end temp is 1239 DEG C, pressure difference
The temperature that skyrockets is 1313 DEG C, and drippage temperature is 1425 DEG C, and softening temperature is 114 DEG C, and reflowing temperature is 112 DEG C, reflowing temperature
Height, and soft heat section is narrow.The soft slag melted after dripping and iron are subjected to molten point of experiment, the slag iron after molten divide is subjected to chemistry point
Analysis, the rate of recovery that the rate of recovery for measuring Fe is 96.2%, Ti is 97.1%.While iron-smelting raw material can be used as, the rate of recovery of Ti
Also it is improved.The result shows that the low chromium type vanadium-titanium magnitite sinter of acquisition carries good gas permeability, and molten drop in soft melting dropping
Better performances, have preferably metallurgical performance.
Embodiment 4
The present embodiment is that concrete operations are as follows on the basis of embodiment 1：
1. batch mixing
Will sintering materials according to red lattice low chromium type vanadium titano-magnetite 13.6kg, ilmenite 16.5kg, common magnetic iron ore 30kg,
Blast furnace dust 0.9kg, magnetic separation 0.8kg, return mine 18kg, and pulverized limestone 12.5kg, coke accounts for the 2.5kg of gross weight, and coal dust accounts for gross weight
2.5kg.Raw material is weighed by above-mentioned dispensing, is put into batch mixer and carries out mixed ore deposit, in mixing process, sprinkling spray water accounts for total original
Expect 7%, mixing time 18min of weight, boil in a covered pot over a slow fire material 13min, continue batch mixing 14min.
2. granulation
The raw material mixed is poured into drum pelletizer and starts to pelletize, in pelletization, sprinkling spray water accounts for total original
Expect the 0.5% of weight, pelletize 8min, obtains the sintering ball material of low chromium type vanadium-titanium magnitite sinter；Wherein, ball material granularity is in 2~5mm
In the range of ball material accounting 80%.
3. discharging
After granulation, the speed of granulator is reduced to 10r/min, will<2mm, 2~3mm, 3~4mm,>5mm grades
Ball material is respectively put into different containers.
4. cloth
By sintered balls material cloth on sintering machine, sintering feed of the grade more than 5mm is distributed in the bottom of sintering machine, then
The sintered balls material that grade is 3~4mm is distributed on it, is then distributed the sintered balls material that grade is 2~3mm on it, finally will
Sintered balls material of the grade less than 2mm is distributed in the top, and uniformly spreads the coke powder of 0.6mm thickness as Jie that ignites in the superiors
Matter, overall thickness of feed layer are 780mm.
5. igniting
Light a fire and sinter on sintering machine, while combustion fan is started to work, the temperature whole story for sintering of lighting a fire is 985 DEG C, point
Fiery negative pressure is 8.5kPa, duration of ignition 3min.
6. sintering
Down draft sintering equipment is started to work after the completion of igniting, suction pressure 11kPa, and the sintering in whole sintering process gives up
Temperature degree records in real time, and when exhaust gas temperature drops to 110 DEG C, sintering process terminates, and down draft sintering equipment is stopped.
It is 7. broken
Sintering process terminates, and cleaner and single-tooth roller are started to work, and sinter enters monodentate roller apparatus by sintering machine, into
Enter the screening stage after broken.
8. screening
Sinter after broken is sent into screening system, obtains the finished product sinter that grade is 5~40mm, burns till rate 89%.
9. performance detection
By by existing standard and experimental method, the low chromium type vanadium-titanium magnitite sinter performance prepared to the present embodiment into
Row experiment, measures drum strength as 58%；Low-temperature reduction disintegration rate RDI+3.15For 87%, low-temperature reduction disintegration can be preferably；
Reproducibility RI is 74%, shows that reproducibility is preferable；It is 1120 DEG C to soften start temperature, and softening end temp is 1236 DEG C, pressure difference
The temperature that skyrockets is 1322 DEG C, and drippage temperature is 1440 DEG C, and softening temperature is 116 DEG C, and reflowing temperature is 119 DEG C, its reflowing temperature
Height, and soft heat section is narrow.The soft slag melted after dripping and iron are subjected to molten point of experiment, the slag iron after molten divide is subjected to chemistry point
Analysis, the rate of recovery that the rate of recovery for measuring Fe is 97.3%, Ti is 97.5%.While iron-smelting raw material can be used as, the rate of recovery of Ti
Also it is improved.The result shows that the low chromium type vanadium-titanium magnitite sinter of acquisition carries good gas permeability, and molten drop in soft melting dropping
Better performances, have preferably metallurgical performance.
Embodiment 5
The present embodiment is that concrete operations are as follows on the basis of embodiment 1：
1. batch mixing
Materials will be sintered according to red lattice low chromium type vanadium titano-magnetite 14kg, ilmenite 16kg, common magnetic iron ore 30kg, blast furnace
Stove dirt 0.5kg, magnetic separation 0.8kg, return mine 20kg, and 13 kg of pulverized limestone, coke accounts for the 2.5kg of gross weight, and coal dust accounts for gross weight
2.5kg.Raw material is weighed by above-mentioned dispensing, is put into batch mixer and carries out mixed ore deposit, in mixing process, sprinkling spray water accounts for gross weight
9%, mixing time 20min, boil in a covered pot over a slow fire material 12min, continue batch mixing 20min.
2. granulation
The raw material mixed is poured into drum pelletizer and starts to pelletize, in pelletization, sprinkling spray water accounts for
0.5%, pelletize 12min, obtains the sintering ball material of low chromium type vanadium-titanium magnitite sinter；Wherein, ball material granularity is in the range of 2~5mm
Ball material accounting 85%.
3. discharging
After granulation, the speed of granulator is reduced to 10r/min, will<2mm, 2~3mm, 3~4mm,>5mm grades
Ball material, is respectively put into different containers.
4. cloth
By sintered balls material cloth on sintering machine, sintering feed of the grade more than 5mm is distributed in the bottom of sintering machine, then
The sintered balls material that grade is 3~4mm is distributed on it, is then distributed the sintered balls material that grade is 2~3mm on it, finally will
Sintered balls material of the grade less than 2mm is distributed in the top, and uniformly spreads the coke powder of 1.4mm thickness as Jie that ignites in the superiors
Matter, overall thickness of feed layer are 820mm.
5. igniting
Light a fire and sinter on sintering machine, while combustion fan is started to work, the temperature whole story for sintering of lighting a fire is 1000 DEG C, point
Fiery negative pressure is 9kPa, duration of ignition 1.8min.
6. sintering
Down draft sintering equipment is started to work after the completion of igniting, suction pressure 11.5kPa, the sintering in whole sintering process
Exhaust gas temperature records in real time, and when exhaust gas temperature drops to 120 DEG C, sintering process terminates, and down draft sintering equipment is stopped.
It is 7. broken
Sintering process terminates, and cleaner and single-tooth roller are started to work, and sinter enters monodentate roller apparatus by sintering machine, into
Enter the screening stage after broken.
8. screening
Sinter after broken is sent into screening system, obtains the finished product sinter that grade is 5~40mm, burns till rate 92%.
9. performance detection
By by existing standard and experimental method, the low chromium type vanadium-titanium magnitite sinter performance prepared to the present embodiment into
Row experiment, measures drum strength as 71%；Low-temperature reduction disintegration rate RDI+3.15For 89%, low-temperature reduction disintegration can be preferably；
Reproducibility RI is 76%, shows that reproducibility is preferable；It is 1124 DEG C to soften start temperature, and softening end temp is 1246 DEG C, pressure difference
The temperature that skyrockets is 1324 DEG C, and drippage temperature is 1453 DEG C, and softening temperature is 122 DEG C, and reflowing temperature is 129 DEG C, reflowing temperature
Height, and soft heat section is narrow.The soft slag melted after dripping and iron are subjected to molten point of experiment, the slag iron after molten divide is subjected to chemistry point
Analysis, the rate of recovery that the rate of recovery for measuring Fe is 97.5%, Ti is 98.3%.While iron-smelting raw material can be used as, the rate of recovery of Ti
Also it is improved.The result shows that the low chromium type vanadium-titanium magnitite sinter of acquisition carries good gas permeability, and molten drop in soft melting dropping
Better performances, have preferably metallurgical performance.
Comparative example
Sinter is prepared using the prior art, the present invention is CN104561530A with reference to existing patent publication No., middle titanium-type
Prepared by high-strength sintered ore deposit and preparation method thereof, carried out, specifically included using method in embodiment 1：Red lattice low chromium type
Vanadium titano-magnetite 50kg, ilmenite 14kg, common magnetic iron ore 10kg, gassy 5kg, pulverized limestone 12kg, light dolomite 4
Kg, coke account for the 5kg of gross weight.Raw material is taken by above-mentioned dispensing, is put into batch mixer and carries out mixed ore deposit, in mixing process, water spray accounts for
The 5% of total raw material weight, mixing time 10min, two mixed water sprays account for the 3% of total raw material weight.After the completion of batch mixing, by batch mixing cloth
To sintering machine, 680 mm of thickness of feed layer.1150 DEG C, duration of ignition 2min, sintering pressure 13kPa of firing temperature.When exhaust gas temperature
When degree drops to 100 DEG C, sintering terminates.When sinter is cooled to 70 DEG C and then is crushed, screening, surveys its performance.
According to the sinter preparation method in above patent document, the rate of burning till of low chromium type vanadium-titanium magnitite sinter is 52%, is surveyed
It is 58% to obtain drum strength；Low-temperature reduction disintegration rate RDI+3.15For 57%, reproducibility RI is 46%.Softening start temperature is
1140 DEG C, softening end temp is 1270 DEG C, and pressure difference skyrockets temperature as 1332 DEG C, and drippage temperature is 1475 DEG C, and softening section is
130 DEG C, soft heat section is 143 DEG C.The soft slag melted after dripping and iron are subjected to molten point of experiment, the slag iron after molten divide is subjected to chemistry
Analysis, the rate of recovery that the rate of recovery for measuring Fe is 92.1%, Ti is 84.2%.Compared with the sinter prepared by the present invention, titanium
The rate of recovery it is relatively low.
By the preparation method of the present invention, as a result illustrate from preparation method, Strength Mass, rate of recovery of reducing property and titanium etc.
Aspect is better than being previously mentioned the preparation method of technology in comparative example.
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 low chromium type vanadium titano-magnetite prepares sinter with addition of ilmenite, it is characterised in that it includes step as follows
Suddenly：
S1, batch mixing：Low chromium type vanadium titano-magnetite, ilmenite, common magnetic iron ore, pulverized limestone, blast furnace dust, magnetic separation will be included
Powder, return mine, the raw material of coke and coal dust carries out first time batch mixing, mixing process sprinkling spray water；After batch mixing stops, being boiled in a covered pot over a slow fire
Material, after boiling in a covered pot over a slow fire material, carries out second of batch mixing；
S2, granulation：The raw material mixed is pelletized, in pelletization, into mixture sprinkling account for raw material gross weight 3~
4% moisture, Granulation time are 5~15min, obtain the sintering ball material of low chromium type vanadium-titanium magnitite sinter；
S3, discharging：By reducing the rotating speed of granulator, the sintering ball material of size fractionated is gone out by order from big to small
Expect, and the sintering ball material of size fractionated is loaded with different material receivers；
S4, cloth：Sintering ball material is descending by particle diameter, and cloth is and uniform in the superiors on sintering machine from below to up
Coke powder is spread as medium of igniting, overall thickness of feed layer is 650~800mm；
S5, igniting：Light a fire and sinter on sintering machine, while open combustion fan start-up operation, the temperature of the igniting sintering begins
End is 1000~1150 DEG C, and the negative pressure of the igniting is 7~9kPa, and the time of the igniting is 2~3.5min；
S6, sintering：Down draft sintering is carried out after the completion of igniting, when exhaust gas temperature drops to 100~120 DEG C, sintering process terminates；
S7, crush：The step S6 sinters completed are crushed；
S8, screening：Sinter after the step S7 is crushed is sent into screening system, obtains the finished product that grade is 5~40mm and burns
Tie ore deposit.
2. the method as described in claim 1, it is characterised in that the TFe contents in the low chromium type vanadium titano-magnetite are 50%
~58%, FeO content are 25%~30%, TiO2Content is 10%~15%, Cr2O3Content is 0.5%~1.2%, V2O5Contain
Measure as 0.5%~1.5%, 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 for 45%~
55%, CaO content is 0.5~1.0%, SiO2Content is 5~6%, Al2O3Content is 0.5~1.0%.
3. method as claimed in claim 1 or 2, it is characterised in that the low chromium type vanadium titano-magnetite is 15~35 parts by weight,
The ilmenite is 4~16 parts by weight, and the common magnetic iron ore is 25~35 parts by weight, and the pulverized limestone is 12~13 weight
Part, the blast furnace dust is 0.5~1 parts by weight, and the magnetic separation is 0.5~1 parts by weight, described to return mine as 15~25 weight
Part, the coke and coal dust are 3~6.5 parts by weight.
4. the method as described in claim 1, it is characterised in that the pulverized limestone is replaced with lime stone or/and white lime.
5. such as the method any one of claim 1-4, it is characterised in that in step sl, the sprinkling spray water
Dosage is the 4~9% of raw material gross weight, and the time of the first time batch mixing is 10~20min；The time of the stewing material for 8~
15min, the time of second of batch mixing is 10~25min.
6. such as the method any one of claim 1-5, it is characterised in that in step s 2, in the pelletization, spray
The moisture spilt is spray water, the ball material accounting 75~90% of the ball material granularity of the sintering ball material in the range of 2~5mm.
7. such as the method any one of claim 1-6, it is characterised in that in step s 4, the distributing mode be by
Sintering ball material of the grade more than 5mm is distributed in the bottom of sintering machine, is then distributed the sintering that grade is 3~4mm on it
Ball material, is then distributed the sintering ball material that grade is 2~3mm on it, is finally distributed sintering ball material of the grade less than 2mm
In the top, the thickness of the coke powder of the superiors is 1~2mm thickness.
8. such as the method any one of claim 1-7, it is characterised in that in step s 5, the igniting is to utilize day
Right gas or liquefied petroleum gas or propane and air ignition.
9. such as the method any one of claim 1-8, it is characterised in that in step s 6, the suction pressure control
In 10~12kPa.
10. method as claimed in any one of claims 1-9 wherein, it is characterised in that described crush is to utilize single-tooth roller by bulk
Sinter crushes.
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| CN108866323A (en) * | 2018-07-10 | 2018-11-23 | 东北大学 | A kind of method that high-titanium type vanadium-titanium magnetite prepares sinter with addition of common iron ore |
| CN109785910A (en) * | 2019-03-12 | 2019-05-21 | 攀钢集团攀枝花钢钒有限公司 | Iron ore Optimization Ore Matching and sintering method |
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| CN109785910A (en) * | 2019-03-12 | 2019-05-21 | 攀钢集团攀枝花钢钒有限公司 | Iron ore Optimization Ore Matching and sintering method |
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