CN109852791A - A method of high alkalinity pellet containing Cr-V-Ti is prepared using calcium oxide - Google Patents
A method of high alkalinity pellet containing Cr-V-Ti is prepared using calcium oxide Download PDFInfo
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Abstract
The present invention relates to a kind of methods for preparing high alkalinity pellet containing Cr-V-Ti using calcium oxide, it includes that vanadium titano-magnetite and additive lime powder and sodium bentonite carry out ingredient and make its basicity 1.8~2.1 that this method, which is by raw material, is separately dried drying, dry-mixed mixing；By mixed mineral aggregate mean allocation at two parts, first part of 3~4% water with addition of total mass of raw material, second part of water with addition of total mass of raw material 6~8%, uniform mixing, closed standing；When carrying out pelletizing, mother bulb shaping period uses first part of miberal powder, mother bulb phase of growing up uses second part of miberal powder, amount of water sprayed control is in 1ml/10g miberal powder~2ml/10g miberal powder before mother bulb is grown up, prevent adhesion between mother bulb, and every time plus water feeding interval was at 40~90 seconds, made pelletizing diameter obtained within 8mm~12mm；Green-ball is carried out later and boils in a covered pot over a slow fire material, drying, preoxidized roast, secondary high-temperature oxidizing roasting, obtains high alkalinity pellet containing Cr-V-Ti.
Description
Technical field
The present invention relates to a kind of methods for preparing high alkalinity pellet containing Cr-V-Ti using calcium oxide, belong to Ferrous Metallurgy refining
Iron production technical field.
Background technique
Currently, the burden structure of blast furnace ironmaking is mixed in proportion by sinter, pellet and lump ore and is formed, vanadium titanium magnetic
The blast furnace process of iron ore is no exception.In general, blast furnace process requires basicity of slag between 1.1-1.3, so high alkalinity
Sinter (general basicity is greater than 1.6) needs the acidic pellet ore (basicity is less than 0.9) with addition of part, more appropriate to be formed
Basicity of slag.This be at present frequently with addition of the burden structure of acidic pellet ore and lump ore be main raw with high basicity sinter
Production. art, but the melting point onset of red lattice sinter containing Cr-V-Ti is high, and generation liquid phase is few, TiO2It is generated by liquid phase diffusion with CaO
CaO·TiO2, cause intensity low, low temperature reduction degradation index is high, and mineral composition is poor.
Panzhihua west area vanadium titano-magnetite metallogenic belt shares four large ore deposits, and centered on Hongge Deposit, there is Panzhihua in south
There are Baima mine and a Tai Hekuang in mine, north, Hongge Deposit category basic-ultrabasic rock type, other than Fe, V, Ti, Cr, Co, Ni of association
Higher, the especially Cr with Pt race constituent content2O3Average content be up to 0.49~0.82%, comprehensive utilization value is big.How
The vanadium titano-magnetite for efficiently using red lattice area is also a technical problem for needing to solve.
Current superfluxed pellets in process of production, since water absorption is big in miberal powder and balling process, balling-up efficiency
It is low, it is easily bonded between mother bulb, uneven components, easily explosion after drying, balling ratio is low, and compression strength is lower than blast furnace feeding requirement
The problems such as.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, the present invention, which mentions, a kind of prepares high alkalinity ball containing Cr-V-Ti using calcium oxide
The method of nodulizing.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
A method of high alkalinity pellet containing Cr-V-Ti being prepared using calcium oxide comprising following steps:
It (1), include that vanadium titano-magnetite and additive lime powder and sodium bentonite carry out ingredient and make its alkali by raw material
Degree is 1.8~2.1, is separately dried drying, dry-mixed mixing, the basicity refers to CaO and SiO total in raw material2Mass ratio；
(2), by mixed mineral aggregate mean allocation at two parts, first part of 3~4% water with addition of total mass of raw material, second
Part with addition of total mass of raw material 6~8% water, uniform mixing mixes to the blocking state of powder is pinched, by the material of mixing in room temperature
Under closed standing, keep bed of material humidity uniform；
(3), the revolving speed of 30r/min~45r/min carries out pelletizing, the amount of water sprayed before mother bulb is grown up on disc balling machine
Control prevents adhesion between mother bulb in 1ml/10g miberal powder~2ml/10g miberal powder, and adds water feeding interval 40~90 every time
Second, make pelletizing diameter obtained within 8mm~12mm, wherein mother bulb shaping period uses first part of miberal powder, and mother bulb is grown up the phase
Using second part of miberal powder, last green-ball water content obtained is measured 8%~10%；
(4), at room temperature by the stewing material of the green-ball of 0.5~1h；
(5), by the green-ball drying after step (4) stewing material, preoxidized roast；
(6), the green-ball after preoxidized roast is subjected to secondary high-temperature oxidizing roasting, obtains high alkalinity pelletizing containing Cr-V-Ti
Mine.
Method as described above, it is preferred that in step (1), when the vanadium titano-magnetite is middle low chromium type v-ti magnetite
Mine, TFe content are 53%~57%, TiO by mass percentage2Content is 10%~12%, Cr2O3Content be 0.3%~
0.6%, V2O5Content is 0.9%~1.4%, and content of MgO is 2.5%~4%, and CaO content is in 0.5%~1.0%, SiO2Contain
Amount is 1%~3%；Lime powder is the 4.9%~5.8% of total mass of raw material in additive.
Method as described above, it is preferred that in step (1), the vanadium titano-magnetite is high-chromic vanadium-titanium ferroferrite,
TFe content is that 50%~55%, FeO content is 23%~27%, TiO by mass percentage2Content is 10%~12%, Cr2O3
Content is 0.7%~1.0%, V2O5Content 0.8%~1.2%, content of MgO 2.5%~4%, CaO content 0.8%~
1.0%, SiO2Content is 4%~5%；The lime powder of addition is the 8.2%~9.7% of total mass of raw material.
Method as described above, it is preferred that the SiO in step (1), in the sodium bentonite2Mass content be
42%~48%, CaO content is that 3.5%~4.5%, Na content accounts for 4%~5%, and sodium bentonite additive amount is high-chromic vanadium
The 1%~2% of titanomagnetite quality.
Method as described above, it is preferred that in step (1), the temperature of the dry drying is 100 DEG C~105 DEG C, when
Between be 5~6 hours.
Method as described above, it is preferred that in step (1), the granularity of the vanadium titano-magnetite less than 200 mesh (partial size <
0.074mm) account for 65~75%.
Method as described above, it is preferred that in step (2), the time of the mixing is 15min~20min, described quiet
The time set is 20min~30min.
Method as described above, it is preferred that in step (5), the temperature of the drying is 100 DEG C~105 DEG C, drying
Time is 3~4 hours.
Method as described above, it is preferred that in step (5), 900 DEG C~950 DEG C of the temperature of the preoxidized roast, roasting
The burning time is 15min~20min, and the flow velocity of blast air is 2L/min~3L/min when roasting.
Method as described above, it is preferred that in step (6), the temperature of the secondary high-temperature oxidizing roasting is 1200 DEG C
~1300 DEG C, the flow of blow air is 2.5L/min~5L/min, calcining time 20min~30min when roasting.
(3) beneficial effect
The beneficial effects of the present invention are:
The method provided by the invention for preparing high alkalinity pellet containing Cr-V-Ti using calcium oxide has the advantage that preparation
Process is simple, not complicated operating procedure；Using sodium bentonite, absorption speed is slow, and water absorption rate and expansion multiple are big, have compared with
High plasticity and stronger caking property, is conducive to the bonding balling-up of Alkalinous pelletizing；Pelletizer revolving speed is very fast, increases Alkalinous pelletizing
The rolling of material reduces the probability of mother bulb bonding, increases mother bulb from the frequency rolled, is conducive to improve green ball strength；Roasting system
Degree is continuous, and temperature is slightly above general pellet roasting temperature and is averagely maintained at so that the compression strength of Alkalinous pelletizing greatly improves
Within the scope of 2000N~3300N, meet blast furnace feeding requirement, improves pelletizing into mine efficiency, reduce costs.
Method of the invention improves the basicity of pellet by addition lime powder, due to adding a large amount of alkaline materials
The water imbibition for increasing miberal powder, in balling process mother bulb shaping period and the mother bulb phase of growing up have a significant impact, therefore by mineral aggregate
The raw material for being divided into two parts different humidity in proportion carries out stewing material, in addition, being increased according to the characteristic of the high basicity pellet of addition calcium oxide
Second stewing material process after having added pelletizing, using carrying out a preoxidized roast and secondary high-temperature under the conditions of blow air
Oxidizing roasting solves the problems such as green ball strength is low, and compression strength is low, and humidity is big, and easy dusting is with bursting after drying, and it is excellent that performance is made
The good full vanadium-titanium pellet of high alkalinity low chromium type.
By lot of experiment validation, high alkalinity full vanadium titanium globe containing chromium type made from the method for the present invention addition CaO obtained
Mine, low temperature reduction degradation index RDI-3.15mm is 8%~14%, well below the low temperature reduction degradation index of high basicity sinter；
For reduction swellability rate RSI in 7%~9% range, reduction swellability rate is smaller；Pelletizing oxygenation efficiency is more complete, most titanium magnet
Mine has been oxidized to the haplotypite of easy reduction, and haplotypite accounts for 70% or more, and titanomagnetite only accounts for 1%~5%；Medium temperature reduction
For rate RI 85% or more, Chinese reducing property is preferable；The softening start temperature (1110 DEG C~1250 DEG C) of superfluxed pellets melts
Change start temperature (1220 DEG C~1320 DEG C), drippage temperature (1410 DEG C~1550 DEG C) higher alkalisation sinter is low, softened zone
Between and droplet temperature section respectively between 60 DEG C~150 DEG C and 120 DEG C~250 DEG C, pressure difference is low between stock column, dropping performance compared with
Good, good permeability has preferable metallurgical performance, and blast furnace can improve burden structure with addition of after, reduces the stock column pressure difference of blast furnace, increases
The reproducibility of furnace charge reduces low temperature reduction degradation, has good effect to the volume increase of blast furnace, section coke.
Detailed description of the invention
Fig. 1 is the flow chart of one preferred embodiment of the method for the present invention；
Fig. 2 is the macro morphology figure of the green-ball in one embodiment of the method for the present invention；
Fig. 3 is the electronic scanner microscope image of the superfluxed pellets of one embodiment of the method for the present invention.
Specific embodiment
The method that a kind of additional calcium oxide provided by the invention prepares high alkalinity full vanadium-titanium pellet containing chromium type, can be used red
Lattice area containing chromic vanadium-titanium ferroferrite be used as raw material, addition analysis carbonate-free lime powder, sodium bentonite, with pellet original
Expect that basicity is 1.8~2.1 high alkalinity, miberal powder is higher containing calcium oxide, and granularity is thinner, more difficult balling-up under general pelletizing parameter,
It is different from general pelletizing mineral aggregate, the water imbibition of miberal powder is increased due to adding a large amount of alkaline materials, to the mother in balling process
Ball forming phase and the mother bulb phase of growing up have a significant impact, therefore the raw material that mineral aggregate is divided into two parts to different humidity in proportion is boiled in a covered pot over a slow fire
Mine increases the after pelletizing according to the characteristic of the high basicity pellet of addition calcium oxide in addition, be different from general stewing material process
Material process is boiled in a covered pot over a slow fire twice, then passes through a preoxidized roast and secondary high-temperature oxidizing roasting in the Muffle furnace of outer blow air, solution
Certainly green ball strength is low, and compression strength is low, and humidity is big, and after drying the problems such as easy dusting and explosion, the high alkalinity of function admirable is made
The full vanadium-titanium pellet of low chromium type.
Concrete operations can be performed as follows, flow chart as shown in Figure 1,
1, raw material preparation: red lattice area high-chromic vanadium-titanium ferroferrite prepares analysis carbonate-free lime powder, sodium base as raw material
Bentonite is as additive；Total alkalinity is 1.8~2.1 in raw material；
Wherein basicity is the ratio of raw material neutral and alkali oxide and acidic oxide, and the basicity in the present invention is diacidic base
Degree specially refers to CaO and SiO2Mass ratio.
2, raw material stoving: raw material and additive are individually placed to be placed in drying box in enamel tray and dried；
3, it sieves: being sieved with -0.5mm and sieve dry schreyerite powder, the carry out fine grinding to granularity requirements are unsatisfactory for
Again it is sieved；
4, schreyerite powder and analysis carbonate-free lime powder and sodium bentonite first dry-mixed mixing: are subjected to dry-mixed mixing；
5, the stewing material of stacking wet mixing: weighing, by mixed mineral aggregate mean allocation at two parts, portion is with addition of the 3 of total mass of raw material
~4% water, with addition of 6~8% water of total mass of raw material, uniform mixing 15min~20min mixes blocking to powder is pinched for another
State keep bed of material humidity uniform the material of mixing closed standing 20min~30min at room temperature；
6, pelletizing: pelletizing is carried out with the revolving speed of 30r/min~45r/min on disc balling machine, before mother bulb is grown up
Amount of water sprayed is controlled in 1ml/10g miberal powder~2ml/10g miberal powder, prevents adhesion between mother bulb, and adds water feeding interval to exist every time
1min or so makes the abundant rolling compacting of miberal powder, and pelletizing diameter obtained is within 8mm~12mm, wherein mother bulb shaping period uses
The miberal powder of water distribution quantity 3~4%, mother bulb grow up the phase use water distribution quantity 6~8% miberal powder；
Mother bulb shaping period refers to during pelletizing, and mineral aggregate is started to the mistake reunited to before the ball for forming 1~3mm of diameter
Journey, the mother bulb phase of growing up refer to the process of that mother bulb continues to grow up to the ball of final diameter size.Wherein match in mother bulb shaping period use
The miberal powder pelletizing of water 3~4%, mother bulb grow up the phase use water distribution quantity 6~8% miberal powder pelletizing.First using water distribution quantity 3~
4% miberal powder pelletizing uses the miberal powder pelletizing of water distribution quantity 6~8% again later, is conducive to mother bulb in this way and forms mellow and full rule, at
Divide uniformly, density is high, and compression strength is big, grows up for pelletizing and provides quality good kernel, on the contrary, can make if on the contrary operate
Mother bulb it is soft, shape is oblate, is easily bonded other small ball impact pelletizing processes.
7, the stewing material of green-ball: the high basicity pellet for adding a large amount of calcium oxide is easy to absorb large quantity of moisture, make after green-ball, ball
Group intensity and compression strength is lower and calcium oxide reacted with water generation calcium hydroxide degree it is insufficient, so will be in room
The stewing material of the lower green-ball by 0.5~1h of temperature, can effectively increase the intensity and compressive property of green-ball；
8, green-ball is dry: the green-ball made being dried in drying box, 100 DEG C~105 DEG C of drying temperature, drying time 3
~4 hours；
9, green-ball preoxidized roast: 1# Muffle furnace is risen to 900 DEG C~950 DEG C, green-ball is put into the sky of external drum 2L/min
Preoxidized roast, calcining time 15min~20min are carried out in the Muffle furnace of gas；
10, secondary high-temperature oxidizing roasting: rising to 1200 DEG C~1300 DEG C for 2# Muffle furnace, and the green-ball that prebake is burnt down is rapid
It is put into furnace and carries out secondary high-temperature oxidizing roasting, the air of external drum 2.5L/min~5L/min increases oxidizing atmosphere, calcining time
20min~30min, the pelletizing that roasting is terminated take out, and are air-cooled to room temperature, and the full vanadium-titanium pellet of high alkalinity chromium type high is made.
In a preferred embodiment, the low chromium type vanadium titano-magnetite in red lattice area can be used in raw material, and TFe content presses quality
Percentage is 53%~57%, TiO2Content is 10%~12%, Cr2O3Content is 0.3%~0.6%, V2O5Content is 0.9%
~1.4%, content of MgO is 2.5%~4%, and CaO content is in 0.5%~1.0%, SiO2Content is 1%~3%；In additive
Calcium oxide is the 4.9%~5.8% of total mass of raw material；The SiO in sodium bentonite in additive2Content be 42%~
48%, CaO content is that 3.5%~4.5%, Na content accounts for 4%~5%, and sodium bentonite additive amount is chromium type high v-ti magnetite
The 1%~2% of mine gross mass.
In a preferred embodiment, the high-chromic vanadium-titanium ferroferrite in red lattice area can be used in raw material, and TFe content presses quality
Percentage is that 50%~55%, FeO content is 23%~27%, TiO2Content is 10%~12%, Cr2O3Content be 0.7%~
1.0%, V2O5Content is 0.8%~1.2%, and content of MgO is 2.5%~4%, and CaO content is in 0.8%~1.0%, SiO2Contain
Amount is 4%~5%；Lime powder is the 8.2%~9.7% of total mass of raw material in additive；Na-bentonite in additive
SiO in soil2Content is 42%~48%, and CaO content is that 3.5%~4.5%, Na content accounts for 4%~5%, sodium bentonite
Additive amount is the 1%~2% of high-chromic vanadium-titanium ferroferrite gross mass.
In a preferred embodiment, in raw material stoving, be 100 DEG C~105 DEG C at a temperature of dried, when drying
Between be 5~6 hours.
In a preferred embodiment, when material screening, the granularity of the schreyerite concentrate powder being sieving through is less than 200
Mesh (partial size < 0.074mm) accounts for 65~75%；
In a preferred embodiment, Muffle furnace is high-temperature roasting furnace or pellet roasting furnace.
In order to preferably explain the present invention, in order to understand, below by specific embodiment, present invention work is retouched in detail
It states.The lime powder used in the embodiment of the present invention is pure to analyze, and sodium bentonite is that industry spot uses product.Implement
Example in performance test used in method using: the soft melting dropping performance of the full vanadium-titanium pellet containing chromium is according to GB/T
34211-2017 measurement；The size distribution of the full vanadium titano-magnetite containing chromium is measured according to GB/T10322.7-2004；Containing the full vanadium titanium of chromium
The reduction swellability rate of pellet is measured according to GB/T 13240-1991；The medium temperature reproducibility of the full vanadium-titanium pellet containing chromium is according to GB/
T 13241-1991 measurement；The low temperature reduction degradation index of the full vanadium-titanium pellet containing chromium is measured according to GB/T 13242-1991；Containing chromium
The compression strength of full vanadium-titanium pellet is measured according to GB/T 14201-1993.
Embodiment 1
1, it takes the red lattice area low chromium type vanadium titano-magnetite of 5Kg as raw material, prepares analysis carbonate-free lime powder 246.3g, sodium
Base bentonite 50g as additive, with basicity is 1.8；Addition calcium oxide accounts for material quality 4.9%.
2, raw material and additive are individually placed to be placed in drying box in enamel tray and are dried, 100 DEG C of drying temperature, due to it
The CaO and bentonite added afterwards can influence dry-mixed mixed effect because of water suction, eliminate so to carry out adequately drying to miberal powder
Free water, drying time 6h make miberal powder moisture less than 1%；
3, it is sieved with -0.5mm and sieves dry schreyerite powder, to being unsatisfactory for the carry out fine grindings of granularity requirements mistake again
Sieve makes the miberal powder lower than 200 mesh reach 70%；
4, schreyerite powder and analysis carbonate-free lime powder and sodium bentonite are first subjected to dry-mixed mixing；
5, it weighs, by mixed mineral aggregate mean allocation at two parts, a water with addition of total mass of raw material 4%, another is matched
Add the water of total mass of raw material 8%, uniform mixing 15min is mixed to pinching the blocking state of powder, and the material of mixing is close at room temperature
It closes and stands 20min, keep bed of material humidity uniform；
6, pelletizing is carried out with the revolving speed of 30r/min on disc balling machine, amount of water sprayed control exists before mother bulb is grown up
1ml/10g miberal powder miberal powder, prevents adhesion between mother bulb, and adds water feeding interval in 1min or so every time, rolls miberal powder sufficiently
Dynamic pressure is real, and pelletizing diameter obtained is within 8mm~12mm, wherein mother bulb shaping period uses the miberal powder of water distribution quantity 4%, mother bulb
The phase grow up using the miberal powder of water distribution quantity 8%, measures last green-ball water content obtained 10% or so, this is because CaO is abundant
Water absorption reaction generates Ca (OH)2, Ca (OH)2It can largely absorb water again, so that water content increases；
7, the high basicity pellet for adding a large amount of calcium oxide is easy to absorb large quantity of moisture, make after green-ball, the intensity of pelletizing
With compression strength is lower and calcium oxide react with water generate calcium hydroxide degree it is insufficient, so to pass through at room temperature
The stewing material of the green-ball of 45min, can effectively increase the intensity and compressive property of green-ball；
8, the green-ball made is dried in drying box, 105 DEG C of drying temperature, drying time 4h sufficiently makes calcium hydroxide
Dehydration improves green ball strength so that pellet internal structure is finer and close；
9,1# Muffle furnace is risen to 950 DEG C, green-ball is put into the Muffle furnace of the air of external drum 2L/min and is pre-oxidized
Roasting, calcining time 15min；
10,2# Muffle furnace is risen to 1250 DEG C, the green-ball that prebake is burnt down is put into rapidly progress secondary high-temperature oxidation in furnace
Roasting, using the air for advertising 5L/min is increased outside air pump machine to enhance oxidizing atmosphere, calcining time 30min terminates roasting
Pelletizing takes out, and is air-cooled to room temperature, and the full vanadium-titanium pellet of high alkalinity low chromium type is made.
Experimental test has been carried out to the metallurgical performance of the full vanadium-titanium pellet of high alkalinity low chromium type manufactured in the present embodiment.It measures
The compression strength of the full vanadium-titanium pellet of high alkalinity low chromium type is average in 2062N/ ball~2215N/ ball；Medium temperature reproducibility RI is
77.62%~80.21%；Reduction swellability rate is within 9.3%；Soften start temperature at 1122 DEG C~1138 DEG C, fusion temperature
At 1279 DEG C~1299 DEG C, temperature is dripped at 1487 DEG C~1519 DEG C, softens section in 110~160 DEG C, reflowing temperature is high,
Soft heat section is narrow, meets preferably metallurgical performance.
Embodiment 2
1, take the red lattice area low chromium type vanadium titano-magnetite of 5Kg as raw material, prepare analysis carbonate-free lime powder 259.93g,
Sodium bentonite 50g as additive, with basicity is 1.9；Addition calcium oxide accounts for the 5.15% of material quality.
2, raw material and additive are individually placed to be placed in drying box in enamel tray and are dried, 104 DEG C of drying temperature, due to it
The CaO and bentonite added afterwards can influence dry-mixed mixed effect because of water suction, eliminate so to carry out adequately drying to miberal powder
Free water, drying time 6h make miberal powder moisture less than 1%；
3, it is sieved with -0.5mm and sieves dry schreyerite powder, to being unsatisfactory for the carry out fine grindings of granularity requirements mistake again
Sieve makes the miberal powder lower than 200 mesh reach 75%；
4, schreyerite powder and analysis carbonate-free lime powder and sodium bentonite are first subjected to dry-mixed mixing；
5, it weighs, by mixed mineral aggregate mean allocation at two parts, a water with addition of total mass of raw material 4%, another is matched
Add the water of total mass of raw material 8%, uniform mixing 16min is mixed to pinching the blocking state of powder, and the material of mixing is close at room temperature
It closes and stands 25min, keep bed of material humidity uniform；
6, pelletizing is carried out with the revolving speed of 32r/min on disc balling machine, amount of water sprayed control exists before mother bulb is grown up
1ml/10g miberal powder miberal powder, prevents adhesion between mother bulb, and adds water feeding interval in 1min or so every time, rolls miberal powder sufficiently
Dynamic pressure is real, and pelletizing diameter obtained is within 8mm~12mm, wherein mother bulb shaping period uses the miberal powder of water distribution quantity 4%, mother bulb
The phase grow up using the miberal powder of water distribution quantity 8%, measures last green-ball water content obtained 10%, this is because CaO sufficiently absorbs water
Reaction generates Ca (OH)2, Ca (OH)2It can largely absorb water again, so that water content increases；
7, the high basicity pellet for adding a large amount of calcium oxide is easy to absorb large quantity of moisture, make after green-ball, the intensity of pelletizing
With compression strength is lower and calcium oxide react with water generate calcium hydroxide degree it is insufficient, so to pass through at room temperature
The stewing material of the green-ball of 50min, can effectively increase the intensity and compressive property of green-ball；
8, the green-ball made is dried in drying box, 105 DEG C of drying temperature, drying time 4h sufficiently makes calcium hydroxide
Dehydration improves green ball strength so that pellet internal structure is finer and close；
9,1# Muffle furnace is risen to 950 DEG C, green-ball is put into the Muffle furnace of the air of external drum 2.5L/min and carries out pre- oxygen
Change roasting, calcining time 15min；
10,2# Muffle furnace is risen to 1285 DEG C, the green-ball that prebake is burnt down is put into rapidly progress secondary high-temperature oxidation in furnace
Roasting, using the air for advertising 5L/min is increased outside air pump machine to enhance oxidizing atmosphere, calcining time 25min terminates roasting
Pelletizing takes out, and is air-cooled to room temperature, and the full vanadium-titanium pellet of high alkalinity low chromium type is made.
Experimental test has been carried out to the metallurgical performance of the full vanadium-titanium pellet of high alkalinity low chromium type manufactured in the present embodiment.It measures
The compression strength of the full vanadium-titanium pellet of high alkalinity low chromium type is average in 2500N/ ball~3000N/ ball；Medium temperature reproducibility RI is 78%
~85%；Reduction swellability rate is within 9.0%；Soften start temperature at 1121 DEG C~1142 DEG C, fusion temperature 1285 DEG C~
1305 DEG C, temperature is dripped at 1495 DEG C~1525 DEG C, softens section in 125~155 DEG C, reflowing temperature is high, and soft heat section is narrow,
Meet preferably metallurgical performance.
Embodiment 3
1, it takes the red lattice area low chromium type vanadium titano-magnetite of 5Kg as raw material, prepares analysis carbonate-free lime powder 273.6g, sodium
Base bentonite 50g as additive, with basicity is 2.0；Addition calcium oxide accounts for the 5.42% of material quality.
2, raw material and additive are individually placed to be placed in drying box in enamel tray and are dried, 104 DEG C of drying temperature, due to it
The CaO and bentonite added afterwards can influence dry-mixed mixed effect because of water suction, eliminate so to carry out adequately drying to miberal powder
Free water, drying time 5h make miberal powder moisture less than 1%；
3, it is sieved with -0.5mm and sieves dry schreyerite powder, to being unsatisfactory for the carry out fine grindings of granularity requirements mistake again
Sieve makes the miberal powder lower than 200 mesh reach 70%；
4, schreyerite powder and analysis carbonate-free lime powder and sodium bentonite are first subjected to dry-mixed mixing；
5, it weighs, by mixed mineral aggregate mean allocation at two parts, portion is with addition of 3.5% water, another is with addition of 6.5%
Water, uniform mixing 15min are mixed to pinching the blocking state of powder, and the material of mixing closed standing 20min at room temperature makes to expect
Layer humidity is uniform；
6, pelletizing is carried out with the revolving speed of 35r/min on disc balling machine, amount of water sprayed control exists before mother bulb is grown up
1.5ml/10g miberal powder powder, prevents adhesion between mother bulb, and adds water feeding interval in 1min or so every time, rolls miberal powder sufficiently
Dynamic pressure is real, and pelletizing diameter obtained concentrates on 10mm within 8mm~12mm substantially, wherein mother bulb shaping period uses water distribution quantity
3.5% miberal powder, mother bulb grow up the phase using the miberal powder of water distribution quantity 6.5%, measure last green-ball water content obtained on 10% left side
It is right.；
7, the high basicity pellet for adding a large amount of calcium oxide is easy to absorb large quantity of moisture, make after green-ball, the intensity of pelletizing
With compression strength is lower and calcium oxide react with water generate calcium hydroxide degree it is insufficient, so to pass through at room temperature
The stewing material of the green-ball of 40min, can preferably increase the intensity and compressive property of green-ball, improve the efficiency of pelletizing；
8, the green-ball made is dried in drying box, 105 DEG C of drying temperature, drying time 4h sufficiently makes calcium hydroxide
Dehydration improves green ball strength so that pellet internal structure is finer and close；
9,1# Muffle furnace is risen to 950 DEG C, green-ball is put into the Muffle furnace of the air of external drum 2.5L/min and carries out pre- oxygen
Change roasting, calcining time 15min；
10,2# Muffle furnace is risen to 1280 DEG C, the green-ball that prebake is burnt down is put into rapidly progress secondary high-temperature oxidation in furnace
Roasting, using the air for advertising 5L/min is increased outside air pump machine to enhance oxidizing atmosphere, calcining time 25min terminates roasting
Pelletizing takes out, and is air-cooled to room temperature, and the full vanadium-titanium pellet of high alkalinity low chromium type is made.
Experimental test has been carried out to the metallurgical performance of the full vanadium-titanium pellet of high alkalinity low chromium type manufactured in the present embodiment.It measures
The compression strength of the full vanadium-titanium pellet of high alkalinity low chromium type is average in 2700N/ ball~3500N/ ball；Medium temperature reproducibility RI is 79%
~84%；Reduction swellability rate is within 8.8%；Soften start temperature at 1120 DEG C~1140 DEG C, fusion temperature 1280 DEG C~
1300 DEG C, temperature is dripped at 1490 DEG C~1520 DEG C, softens section in 120~150 DEG C, reflowing temperature is high, and soft heat section is narrow,
Meet preferably metallurgical performance.
Embodiment 4
1, it takes the red lattice area low chromium type vanadium titano-magnetite of 5Kg as raw material, prepares analysis carbonate-free lime powder 287.3g, sodium
Base bentonite 50g as additive, with basicity is 2.1；Addition calcium oxide accounts for material quality 5.69%.
2, raw material and additive are individually placed to be placed in drying box in enamel tray and are dried, 103 DEG C of drying temperature, due to it
The CaO and bentonite added afterwards can influence dry-mixed mixed effect because of water suction, eliminate so to carry out adequately drying to miberal powder
Free water, drying time 6h make miberal powder moisture less than 1%；
3, it is sieved with -0.5mm and sieves dry schreyerite powder, to being unsatisfactory for the carry out fine grindings of granularity requirements mistake again
Sieve makes the miberal powder lower than 200 mesh reach 75%；
4, schreyerite powder and analysis carbonate-free lime powder and sodium bentonite are first subjected to dry-mixed mixing；
5, weigh, by mixed mineral aggregate mean allocation at two parts, it is a with addition of 4% water, another with addition of 8% water,
Uniform mixing 20min is mixed to pinching the blocking state of powder, by the material of mixing closed standing 25min at room temperature, keeps the bed of material wet
Degree is uniform；
6, pelletizing is carried out with the revolving speed of 40r/min on disc balling machine, amount of water sprayed control exists before mother bulb is grown up
2ml/10g miberal powder prevents adhesion between mother bulb, and adds water feeding interval in 1min or so every time, and miberal powder is made sufficiently to roll pressure
Real, pelletizing diameter obtained concentrates on 10mm within 8mm~12mm substantially, wherein mother bulb shaping period uses water distribution quantity 4%
Miberal powder, mother bulb phase of growing up uses the miberal powder of water distribution quantity 8%, measures last obtained green-ball water content 10%~12%；
7, the high basicity pellet for adding a large amount of calcium oxide is easy to absorb large quantity of moisture, make after green-ball, the intensity of pelletizing
With compression strength is lower and calcium oxide react with water generate calcium hydroxide degree it is insufficient, so to pass through at room temperature
The stewing material of the green-ball of 45min, can effectively increase the intensity and compressive property of green-ball；
8, the green-ball made is dried in drying box, 100 DEG C of drying temperature, drying time 4h sufficiently makes calcium hydroxide
Dehydration improves green ball strength so that pellet internal structure is finer and close；
9,1# Muffle furnace is risen to 950 DEG C, green-ball is put into the Muffle furnace of the air of external drum 3L/min and is pre-oxidized
Roasting, calcining time 15min；
10,2# Muffle furnace is risen to 1270 DEG C, the green-ball that prebake is burnt down is put into rapidly progress secondary high-temperature oxidation in furnace
Roasting, using the air for advertising 5L/min is increased outside air pump machine to enhance oxidizing atmosphere, calcining time 25min terminates roasting
Pelletizing takes out, and is air-cooled to room temperature, and the full vanadium-titanium pellet of high alkalinity low chromium type is made.
Experimental test has been carried out to the metallurgical performance of the full vanadium-titanium pellet of high alkalinity low chromium type manufactured in the present embodiment.It measures
The compression strength of the full vanadium-titanium pellet of high alkalinity low chromium type is average in 2400N/ ball~3300N/ ball；Medium temperature reproducibility RI is 79%
~82%；Reduction swellability rate is within 9.2%；Soften start temperature at 1110 DEG C~1130 DEG C, fusion temperature 1240 DEG C~
1320 DEG C, temperature is dripped at 1485 DEG C~1540 DEG C, softens section in 130~160 DEG C, reflowing temperature is high, and soft heat section is narrow,
Meet preferably metallurgical performance.
Embodiment 5
1, take the red lattice area high-chromic vanadium-titanium ferroferrite of 5Kg as raw material, prepare analysis carbonate-free lime powder 414.25g,
Sodium bentonite 50g as additive, with basicity is 1.8；Addition calcium oxide accounts for the 8.2% of material quality.
2, raw material and additive are individually placed to be placed in drying box in enamel tray and are dried, drying temperature 100 DEG C~105
DEG C, since the CaO and bentonite that add later can influence dry-mixed mixed effect because of water suction, so to be carried out to miberal powder sufficient
Free water is eliminated in drying, and drying time 6h makes miberal powder moisture less than 1%；
3, it is sieved with -0.5mm and sieves dry schreyerite powder, to being unsatisfactory for the carry out fine grindings of granularity requirements mistake again
Sieve makes the miberal powder lower than 200 mesh reach 72%；
4, schreyerite powder and analysis carbonate-free lime powder and sodium bentonite are first subjected to dry-mixed mixing；
5, it weighs, by mixed mineral aggregate mean allocation at two parts, portion matches 3.8% water, another is with addition of 7.8%
Water, uniform mixing 15min are mixed to pinching the blocking state of powder, and the material of mixing closed standing 20min at room temperature makes to expect
Layer humidity is uniform；
6, pelletizing is carried out with the revolving speed of 30r/min on disc balling machine, amount of water sprayed control exists before mother bulb is grown up
1ml/10g miberal powder prevents adhesion between mother bulb, and adds water feeding interval in 1min or so every time, and miberal powder is made sufficiently to roll pressure
Real, pelletizing diameter obtained is within 8mm~12mm, wherein mother bulb shaping period uses the miberal powder of water distribution quantity 3.8%, and mother bulb is long
The big phase uses the miberal powder of water distribution quantity 7.8%；
7, the high basicity pellet for adding a large amount of calcium oxide is easy to absorb large quantity of moisture, make after green-ball, the intensity of pelletizing
With compression strength is lower and calcium oxide react with water generate calcium hydroxide degree it is insufficient, so to pass through at room temperature
The stewing material of the green-ball of 45min, can effectively increase the intensity and compressive property of green-ball；
8, the green-ball made is dried in drying box, 105 DEG C of drying temperature, drying time 4h sufficiently makes calcium hydroxide
Dehydration improves green ball strength so that pellet internal structure is finer and close；
9,1# Muffle furnace is risen to 950 DEG C, green-ball is put into the Muffle furnace of the air of external drum 2.3L/min and carries out pre- oxygen
Change roasting, calcining time 15min；
10, high-temperature oxydation consolidation roasting: 2# Muffle furnace is risen to 1250 DEG C, the green-ball that prebake is burnt down is put into furnace rapidly
Secondary high-temperature oxidizing roasting is carried out, advertises the air of 4.5L/min using increasing outside air pump machine to enhance oxidizing atmosphere, calcining time
30min, the pelletizing that roasting is terminated take out, and are air-cooled to room temperature, and the full vanadium-titanium pellet of high alkalinity chromium type high is made.
Experimental test has been carried out to the metallurgical performance of the full vanadium-titanium pellet of high alkalinity chromium type high manufactured in the present embodiment.It measures
The compression strength of the full vanadium-titanium pellet of high alkalinity chromium type high is average in 2062N/ ball~2215N/ ball；Medium temperature reproducibility RI is
77.62%~80.21%；Reduction swellability rate is within 9.3%；Soften start temperature at 1120 DEG C~1140 DEG C, fusion temperature
At 1280 DEG C~1300 DEG C, temperature is dripped at 1490 DEG C~1520 DEG C, softens section in 120~150 DEG C, reflowing temperature is high,
Soft heat section is narrow, meets preferably metallurgical performance.
Embodiment 6
1, it takes the red lattice area high-chromic vanadium-titanium ferroferrite of 5Kg as raw material, prepares analysis carbonate-free lime powder 437.3g, sodium
Base bentonite 50g as additive, with basicity is 1.9；Addition calcium oxide accounts for the 8.66% of material quality.
2, raw material and additive are individually placed to be placed in drying box in enamel tray and are dried, 104 DEG C of drying temperature, due to it
The CaO and bentonite added afterwards can influence dry-mixed mixed effect because of water suction, eliminate so to carry out adequately drying to miberal powder
Free water, drying time 6h make miberal powder moisture less than 1%；
3, it is sieved with -0.5mm and sieves dry schreyerite powder, to being unsatisfactory for the carry out fine grindings of granularity requirements mistake again
Sieve makes the miberal powder lower than 200 mesh reach 70%；
4, schreyerite powder and analysis carbonate-free lime powder and sodium bentonite are first subjected to dry-mixed mixing；
5, it weighs, by mixed mineral aggregate mean allocation at two parts, portion is with addition of 3.6% water, another is with addition of 7.5%
Water, uniform mixing 15min are mixed to pinching the blocking state of powder, and the material of mixing closed standing 20min at room temperature makes to expect
Layer humidity is uniform；
6, pelletizing is carried out with the revolving speed of 32r/min on disc balling machine, amount of water sprayed control exists before mother bulb is grown up
2ml/10g miberal powder prevents adhesion between mother bulb, and adds water feeding interval in 1min or so every time, and miberal powder is made sufficiently to roll pressure
Real, pelletizing diameter obtained is within 8mm~12mm, wherein mother bulb shaping period uses the miberal powder of water distribution quantity 3.6%, and mother bulb is long
The big phase uses the miberal powder of water distribution quantity 7.5%；
7, the high basicity pellet for adding a large amount of calcium oxide is easy to absorb large quantity of moisture, make after green-ball, the intensity of pelletizing
With compression strength is lower and calcium oxide react with water generate calcium hydroxide degree it is insufficient, so to pass through at room temperature
The stewing material of the green-ball of 35min, can effectively increase the intensity and compressive property of green-ball；
8, the green-ball made is dried in drying box, 105 DEG C of drying temperature, drying time 4h sufficiently makes calcium hydroxide
Dehydration improves green ball strength so that pellet internal structure is finer and close；
9,1# Muffle furnace is risen to 950 DEG C, green-ball is put into the Muffle furnace of the air of external drum 2.5L/min and carries out pre- oxygen
Change roasting, calcining time 15min；
10, high-temperature oxydation consolidation roasting: 2# Muffle furnace is risen to 1260 DEG C, the green-ball that prebake is burnt down is put into furnace rapidly
Secondary high-temperature oxidizing roasting is carried out, advertises the air of 4.5L/min using increasing outside air pump machine to enhance oxidizing atmosphere, calcining time
20min, the pelletizing that roasting is terminated take out, and are air-cooled to room temperature, and the full vanadium-titanium pellet of high alkalinity chromium type high is made.
Experimental test has been carried out to the metallurgical performance of the full vanadium-titanium pellet of high alkalinity chromium type high manufactured in the present embodiment.It measures
The compression strength of the full vanadium-titanium pellet of high alkalinity chromium type high is average in 2138N/ ball~2336N/ ball；Medium temperature reproducibility RI is
79.25%~82.21%；Reduction swellability rate is within 9.0%；Soften start temperature at 1120 DEG C~1140 DEG C, fusion temperature
At 1280 DEG C~1300 DEG C, temperature is dripped at 1490 DEG C~1520 DEG C, softens section in 120~150 DEG C, reflowing temperature is high,
Soft heat section is narrow, meets preferably metallurgical performance.
Embodiment 7
1, it takes the red lattice area high-chromic vanadium-titanium ferroferrite of 5Kg as raw material, prepares analysis carbonate-free lime powder 460.3g, sodium
Base bentonite 50g as additive, with basicity is 2.0；Addition calcium oxide accounts for the 9.11% of material quality.
2, raw material and additive are individually placed to be placed in drying box in enamel tray and are dried, 105 DEG C of drying temperature, due to it
The CaO and bentonite added afterwards can influence dry-mixed mixed effect because of water suction, eliminate so to carry out adequately drying to miberal powder
Free water, drying time 6h make miberal powder moisture less than 1%；
3, it is sieved with -0.5mm and sieves dry schreyerite powder, to being unsatisfactory for the carry out fine grindings of granularity requirements mistake again
Sieve makes the miberal powder lower than 200 mesh reach 75%；
4, schreyerite powder and analysis carbonate-free lime powder and sodium bentonite are first subjected to dry-mixed mixing；
5, it weighs, by mixed mineral aggregate mean allocation at two parts, portion is with addition of 3.7% water, another is with addition of 7%
Water, uniform mixing 20min are mixed to pinching the blocking state of powder, and the material of mixing closed standing 30min at room temperature makes to expect
Layer humidity is uniform；
6, pelletizing is carried out with the revolving speed of 45r/min on disc balling machine, amount of water sprayed control exists before mother bulb is grown up
2ml/10g miberal powder prevents adhesion between mother bulb, and adds water feeding interval in 2min or so every time, and miberal powder is made sufficiently to roll pressure
Real, pelletizing diameter obtained is within 8mm~12mm, wherein mother bulb shaping period uses the miberal powder of water distribution quantity 3.7%, and mother bulb is long
The big phase uses the miberal powder of water distribution quantity 7%；
7, the high basicity pellet for adding a large amount of calcium oxide is easy to absorb large quantity of moisture, make after green-ball, the intensity of pelletizing
With compression strength is lower and calcium oxide react with water generate calcium hydroxide degree it is insufficient, so to pass through at room temperature
The stewing material of the green-ball of 50min, can preferably increase the intensity and compressive property of green-ball, improve the efficiency of pelletizing；
8, the green-ball made is dried in drying box, 105 DEG C of drying temperature, drying time 4h sufficiently makes calcium hydroxide
Dehydration improves green ball strength so that pellet internal structure is finer and close；
9,1# Muffle furnace is risen to 950 DEG C, green-ball is put into the Muffle furnace of the air of external drum 3L/min and is pre-oxidized
Roasting, calcining time 15min；
10,2# Muffle furnace is risen to 1280 DEG C, the green-ball that prebake is burnt down is put into rapidly progress secondary high-temperature oxidation in furnace
Roasting, using the air for advertising 4.6L/min is increased outside air pump machine to enhance oxidizing atmosphere, calcining time 20min terminates roasting
Pelletizing take out, be air-cooled to room temperature, be made the full vanadium-titanium pellet of high alkalinity chromium type high.
Experimental test has been carried out to the metallurgical performance of the full vanadium-titanium pellet of high alkalinity chromium type high manufactured in the present embodiment.It measures
The compression strength of the full vanadium-titanium pellet of high alkalinity chromium type high is average in 2672N/ ball~3455N/ ball；Medium temperature reproducibility RI is
79.86%~83.34%；Reduction swellability rate is within 8.6%；Soften start temperature at 1120 DEG C~1140 DEG C, fusion temperature
At 1280 DEG C~1300 DEG C, temperature is dripped at 1490 DEG C~1520 DEG C, softens section in 120~150 DEG C, reflowing temperature is high,
Soft heat section is narrow, meets preferably metallurgical performance.
Embodiment 8
1, it takes the red lattice area high-chromic vanadium-titanium ferroferrite of 5Kg as raw material, prepares analysis carbonate-free lime powder 483.3g, sodium
Base bentonite 50g as additive, with basicity is 2.1；Addition calcium oxide accounts for the 9.57% of material quality.
2, raw material and additive are individually placed to be placed in drying box in enamel tray and are dried, 105 DEG C of drying temperature, due to it
The CaO and bentonite added afterwards can influence dry-mixed mixed effect because of water suction, eliminate so to carry out adequately drying to miberal powder
Free water, drying time 6h make miberal powder moisture less than 1%；
3, it is sieved with -0.5mm and sieves dry schreyerite powder, to being unsatisfactory for the carry out fine grindings of granularity requirements mistake again
Sieve makes the miberal powder lower than 200 mesh reach 71%；
4, schreyerite powder and analysis carbonate-free lime powder and sodium bentonite are first subjected to dry-mixed mixing；
5, weigh, by mixed mineral aggregate mean allocation at two parts, it is a with addition of 4% water, another with addition of 7% water,
Uniform mixing 15min is mixed to pinching the blocking state of powder, by the material of mixing closed standing 25min at room temperature, keeps the bed of material wet
Degree is uniform；
6, pelletizing is carried out with the revolving speed of 35r/min on disc balling machine, amount of water sprayed control exists before mother bulb is grown up
2ml/10g miberal powder prevents adhesion between mother bulb, and adds water feeding interval in 1min or so every time, and miberal powder is made sufficiently to roll pressure
Real, pelletizing diameter obtained is within 8mm~12mm, wherein mother bulb shaping period uses the miberal powder of water distribution quantity 4%, and mother bulb is grown up
Phase uses the miberal powder of water distribution quantity 7%；
7, the high basicity pellet for adding a large amount of calcium oxide is easy to absorb large quantity of moisture, make after green-ball, the intensity of pelletizing
With compression strength is lower and calcium oxide react with water generate calcium hydroxide degree it is insufficient, so to pass through at room temperature
The stewing material of the green-ball of 45min, can effectively increase the intensity and compressive property of green-ball；
8, the green-ball made is dried in drying box, 100 DEG C of drying temperature, drying time 4h sufficiently makes calcium hydroxide
Dehydration improves green ball strength so that pellet internal structure is finer and close；
9,1# Muffle furnace is risen to 950 DEG C, green-ball is put into the Muffle furnace of the air of external drum 2L/min and is pre-oxidized
Roasting, calcining time 15min；
10,2# Muffle furnace is risen to 1300 DEG C, the green-ball that prebake is burnt down is put into rapidly progress secondary high-temperature oxidation in furnace
Roasting, using the air for advertising 5L/min is increased outside air pump machine to enhance oxidizing atmosphere, calcining time 25min terminates roasting
Pelletizing takes out, and is air-cooled to room temperature, and the full vanadium-titanium pellet of high alkalinity chromium type high is made.
Experimental test has been carried out to the metallurgical performance of the full vanadium-titanium pellet of high alkalinity chromium type high manufactured in the present embodiment.It measures
The compression strength of the full vanadium-titanium pellet of high alkalinity chromium type high is average in 2412N/ ball~2813N/ ball；Medium temperature reproducibility RI is
78.27%~82.29%；Reduction swellability rate is within 9.2%；Soften start temperature at 1120 DEG C~1140 DEG C, fusion temperature
At 1280 DEG C~1300 DEG C, temperature is dripped at 1490 DEG C~1520 DEG C, softens section in 120~150 DEG C, reflowing temperature is high,
Soft heat section is narrow, meets preferably metallurgical performance.
The green-ball prepared in above-described embodiment, carry out it is dry after the stewing material of green-ball before green-ball, its macro morphology is observed, from life
In ball macro morphology figure, it can be seen that for pelletizing at aterrimus, surface compact is flawless, and morphological rules is uniform, and diameter distribution meets just
State distribution, average diameter 10mm.By taking the green-ball of embodiment 1 as an example, macro morphology figure is as shown in Figure 2.
Electronic scanner microscope observation has been carried out to the full vanadium-titanium pellet of high alkalinity in above-described embodiment, has been swept from electronics
It retouches in microscope figure it can be seen that pelletizing have passed through fully oxidized roasting, preferably at mine consolidation, based on bloodstone, ingredient is equal
It is even, without apparent stomata and crack, even density.By taking the full vanadium-titanium pellet of high alkalinity prepared by embodiment 5 as an example, electronics
Flying-spot microscope image is as shown in Figure 3.
The above described is only a preferred embodiment of the present invention, being not the limitation for doing other forms to the present invention, appoint
What those skilled in the art can use the equivalence enforcement that technology contents disclosed above were changed or be modified as equivalent variations
Example.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to the above embodiments
What simple modification, equivalent variations and remodeling, still falls within the protection scope of technical solution of the present invention.
Claims (10)
1. a kind of method for preparing high alkalinity pellet containing Cr-V-Ti using calcium oxide, which is characterized in that it includes the following steps:
It (1), include that vanadium titano-magnetite and additive lime powder and sodium bentonite carry out ingredient and make its basicity by raw material
1.8~2.1, it is separately dried drying, dry-mixed mixing, the basicity refers to CaO and SiO total in raw material2Mass ratio；
(2), by mixed mineral aggregate mean allocation at two parts, first part of 3~4% water with addition of total mass of raw material, second part is matched
Add 6~8% water of total mass of raw material, uniform mixing is mixed to pinching the blocking state of powder, and the material of mixing is close at room temperature
Standing is closed, keeps bed of material humidity uniform；
(3), the revolving speed of 30r/min~45r/min carries out pelletizing on disc balling machine, and amount of water sprayed controls before mother bulb is grown up
In 1ml/10g miberal powder~2ml/10g miberal powder, adhesion between mother bulb is prevented, and adds water feeding interval at 40~90 seconds every time, is made
Pelletizing diameter obtained is within 8mm~12mm, wherein mother bulb shaping period uses first part of miberal powder, and mother bulb is grown up phase use
Second part of miberal powder measures last green-ball water content obtained 8%~10%；
(4), expect at room temperature by the green-ball of 0.5~1h is stewing,
(5), by the green-ball drying after step (4) stewing material, preoxidized roast；
(6), the green-ball after preoxidized roast is subjected to secondary high-temperature oxidizing roasting.
2. the method as described in claim 1, which is characterized in that in step (1), when the vanadium titano-magnetite is middle low chromium type
Vanadium titano-magnetite, TFe content are 53%~57%, TiO by mass percentage2Content is 10%~12%, Cr2O3Content is
0.3%~0.6%, V2O5Content 0.9%~1.4%, content of MgO 2.5%~4%, CaO content 0.5%~1.0%,
SiO2Content is 1%~3%；Calcium oxide is the 4.9%~5.8% of total mass of raw material in additive.
3. the method as described in claim 1, which is characterized in that the vanadium titano-magnetite is high-chromic vanadium-titanium ferroferrite, TFe
Content is that 50%~55%, FeO content is 23%~27%, TiO by mass percentage2Content is 10%~12%, Cr2O3Contain
Amount is 0.7%~1.0%, V2O5Content 0.8%~1.2%, content of MgO 2.5%~4%, CaO content 0.8%~
1.0%, SiO2Content is 4%~5%；At this point, the calcium oxide is the 8.2%~9.7% of total mass of raw material.
4. the method as described in claim 1, which is characterized in that the SiO in the sodium bentonite2Content is 42%~48%,
CaO content is that 3.5%~4.5%, Na content accounts for 4%~5%, and the sodium bentonite additive amount is high-chromic vanadium-titanium ferroferrite
The 1%~2% of quality.
5. the method as described in claim 1, which is characterized in that in step (1), the temperature of the dry drying is 100 DEG C
~105 DEG C, the time is 5~6 hours.
6. the method as described in claim 1, which is characterized in that in step (1), the partial size of the vanadium titano-magnetite <
0.074mm's accounts for 65~75%.
7. the method as described in claim 1, which is characterized in that in step (2), time of the mixing be 15min~
20min, the time of the standing are 20min~30min.
8. the method as described in claim 1, which is characterized in that in step (5), the temperature of the drying is 100 DEG C~105
DEG C, the time of drying is 3~4 hours.
9. the method as described in claim 1, which is characterized in that in step (5), 900 DEG C of the temperature of the preoxidized roast
~950 DEG C, calcining time is 15min~20min, and the flow velocity of blast air is 2L/min~3L/min when roasting.
10. the method as described in claim 1, which is characterized in that in step (6), the temperature of the secondary high-temperature oxidizing roasting
Degree is 1200 DEG C~1300 DEG C, and the flow of blow air is 2.5L/min~5L/min when roasting, calcining time 20min~
30min。
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| CN111500857A (en) * | 2020-04-15 | 2020-08-07 | 山西太钢不锈钢股份有限公司 | Method for improving pelletizing rate of green pellets of alkaline pellets |
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