CN106544497A - A kind of vanadium-titanium pellet oxidation technology - Google Patents
A kind of vanadium-titanium pellet oxidation technology Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The present invention relates to pellet oxidation field, discloses a kind of vanadium-titanium pellet oxidation technology, improves green-ball oxidation effectiveness, so as to improve the quality of finished ball nodulizing.Green-ball is carried out the present invention following process successively：Forced air drying, convulsion drying, preheating, roasting, ring are cold；Wherein, forced air drying, convulsion drying, preheating is carried out in drying grate；In all green-balls, diameter accounts for more than 70% in the green-ball of 8 14mm scopes, and the fabric thickness of drying grate is 180 190mm.The present invention is applied to vanadium-titanium pellet oxidation production, can strengthen pelletizing drying, pre-heat effect, and finished pellet oxidation concretion is uniform.
Description
Technical field
The present invention relates to pellet oxidation field, more particularly to a kind of vanadium-titanium pellet oxidation technology.
Background technology
Pellet is one of main furnace charge of blast furnace process, and its quality is to blast furnace process important role.In recent years, one
The fast development of aspect pelletizing industry, production capacity constantly expand, and competition gets over aggravation；Depressed, the stove of another aspect steel market
Smelting needs further to improve efficiency, reduces cost, therefore the requirement more and more higher to quality of furnace charge, and some steel plant have adjusted
Burden structure, reduces the demand of outsourcing pellet.Therefore, pellet quality is further improved, smelting performance is improved, is become
The matter of utmost importance of current pelletizing industry.
FeO contents are one of main physical and chemical indexs of pellet, and the high pellet reproducibility of FeO contents is just reduced, be increased
Blast furnace process cost.It is generally believed that the reduction degree of feed stock for blast furnace often improves 10 percentage points, coke ratio can reduce by 8%～9%；FeO
Content often reduces by 1 percentage point, and coke ratio can reduce by 1%.Therefore providing high, the Well-recovered pellet of intensity to blast furnace can expire
The smelting of sufficient blast furnace needs.
Forced air drying, convulsion drying, preheated one-section, preheating two-stage nitration, roasting, ring are generally comprised in pellet oxidation technology cold
One section, the cold two-stage nitration of ring, the step such as cold three sections of ring.Wherein, forced air drying, convulsion drying, preheated one-section, preheating two-stage nitration are in drying grate
In carry out, roasting is carried out in rotary kiln, and ring is cold one section, the cold two-stage nitration of ring, cold three sections of ring are carried out in central cooler.What convulsion was dried
The hot waste gas that low temperature hot blast is reclaimed from preheating two-stage nitration from three sections of wind out of central cooler, the thermal source that convulsion is dried, preheating one
Hot waste gas of the section thermal source from the cold two-stage nitration of ring, preheats the hot waste gas of the thermal source from rotary kiln of two-stage nitration.
The content of the invention
The technical problem to be solved in the present invention is：A kind of vanadium-titanium pellet oxidation technology is provided, green-ball oxidation effectiveness is improved,
So as to improve the quality of finished ball nodulizing.
To solve the above problems, the technical solution used in the present invention is：A kind of vanadium-titanium pellet oxidation technology, by green-ball according to
It is secondary to carry out following process：Forced air drying, convulsion drying, preheating, roasting, ring are cold；Wherein, forced air drying, convulsion are dried, preheat
Carry out in drying grate；In all green-balls, diameter accounts for more than 70% in the green-ball of 8-14mm scopes, and the fabric thickness of drying grate is
180-190mm.It is controlled by the diameter and internal composition to green-ball, while fabric thickness is controlled by 200mm
In the range of 180-190mm, therefore the present invention is very fast to the drying and preheating of green-ball, is difficult to form layering in baking and concretion,
Avoid shell and difficult oxidation pseudobrookite is generated, hinder the oxidation of internal layer.
Further, sintering temperature is 1150 DEG C -1180 DEG C, so that pellet Internal oxidation rate is more than consolidation speed
Degree, pellet major part FeO oxidations are complete, final to aoxidize and consolidate relatively completely, inside and outside no obvious lamination.Roasting
Pellet profile morphology after the completion of connecing has metallic luster, section frosted shape without substantially layering, Lycoperdon polymorphum Vitt.
Further, preheating includes preheated one-section and preheating two-stage nitration；When preheating, preheating two-stage nitration flue gas is guided into pre-
One section of heat, makes preheated one-section petticoat pipe temperature that terraced distribution is presented, and temperature is stepped up, and is conducive to strengthening pelletizing drying and preheating transition
Process function.
Further, described will preheating the step of two-stage nitration flue gas guides preheated one-section into includes：In preheated one-section and preheating two
Partition wall punching between section, guides the flue gas of preheating two-stage nitration first segment bellows top petticoat pipe into preheating one by the hole beaten on partition wall
Section.
Further, the flue gas (hot waste gas) produced during extracting forced air drying using multigroup chimney, so that more
Many hot waste gas are perforated through the bed of material, have taken away the more moisture of green-ball.
Further, when preheating, pelletizing keeps the time of more than 5min at a temperature of more than 950 DEG C so that preheating
Stage ensure that the enough high-temperature oxydation time.
The invention has the beneficial effects as follows：By the above-mentioned process modification of the present invention, preheat in vanadium-titanium pellet oxidizing process
And sintering temperature gradient further tends to gently, consolidate pellet internal oxidation uniform, reduce dysoxidizable pseudobrookite
Generate so that pellet oxygenation efficiency is reduced to 2% by more than 5%, and sefstromite concentrate material condition preferably, quality of green pellets
Under the conditions of good, the cold system of ring is more excellent, oxygenation efficiency is minimum can to drop to 1% or so.
Description of the drawings
Fig. 1 is the change curve of pelletizing oxygenation efficiency under the conditions of different pelletizing diameters.
Fig. 2 is the change curve of pelletizing oxygenation efficiency under different preheating temperatures.
Specific embodiment
By following contrast present invention process parameter and existing process parameter, improvement of the present invention is described in detail.
Wherein, table 1 be existing drying grate technological parameter, table 2 be existing time brickkiln central cooler parameter, table 3 be drying grate technological parameter, table
4 is brickkiln central cooler parameter of the present invention.
1 existing drying grate technological parameter of table
2 existing times brickkiln central cooler parameters of table
3 drying grate technological parameter of the present invention of table
4 present invention of table returns brickkiln central cooler parameter
1st, inventor carries out research by pelletizing production and obtains, and, in pre- thermal oxidation process, its diameter is bigger for pelletizing, internal
FeO be more difficult to that oxidation is complete, then in the finished ball nodulizing for producing, FeO contents are higher.If FeO oxidations are insufficient, may shape
Into olivine.And temperature is higher, the amount of formation is more, and it is also better that olivine occurs cementing degree.Under optical microscope also
Can substantially find that the titanomagnetite of the haplotypite, pseudobrookite in pre- hot-bulb and remaining is mainly distributed on Fe2O3Granule it
Between, occur with cementing form more.At present the pelletizing of produced on-site is relatively large in diameter, and great majority are 17～23mm, and pelletizing diameter is too big
The oxidation of FeO is hindered to a certain extent.Thus, preheated pellets are very low in the oxygenation efficiency in the stage, preheat the oxygen of end pelletizing
Rate still only has 32% or so.If FeO oxidations are incomplete, by with pelletizing in TiO2Reaction generates a certain amount of iron plate titanium
Ore deposit.And pseudobrookite is a kind of mineral for being difficult to and aoxidizing in itself, which generates the further oxidation by FeO is hindered, and this is to cause into
FeO higher main cause in product ball.Also find that drying grate 200mm fabric thickness technological designs limit green-ball diameter simultaneously
Reduction.After green-ball diameter control lives in below 12mm, comprcssive strength is reduced, and deep bed sintering is excessive to the pressure of lower floor's green-ball, causes
The fragmentation of green-ball.
To investigate, FeO contents in live finished ball are higher and relation between green-ball diameter, and it is straight that inventor have studied green-ball
Impact of the footpath to preheated pellets oxygenation efficiency, as shown in figure 1, fixing other experimental conditions：950 DEG C of preheating temperature, oxygen in air-flow
Oxygen content 15%, air flow rate 15L/min.In Fig. 1, curve shows, impact of the pelletizing diameter to oxygenation efficiency is larger.In identical
Under preheating condition, with the increase of diameter, pelletizing oxygenation efficiency is gradually lowered.When pelletizing diameter increases to 16mm from 12mm, oxygen
The amplitude that rate is reduced is less；When diameter continues to increase to 20mm, the amplitude that pelletizing oxygenation efficiency is reduced is larger.Work as preheating temperature
For 950 DEG C, preheating time is 10min, the pelletizing oxygenation efficiency respectively 81.56% and 76.15% of a diameter of 12mm and 16mm, and
The pelletizing oxygenation efficiency of a diameter of 20mm is only 56.16%.Show that pelletizing diameter is bigger, the oxidation to FeO is more unfavorable.Main cause
Oxidation for pelletizing is carried out from surface to center, and in the oxidation incipient stage, the FeO on top layer is aoxidized first, forms Fe2O3Shell
Layer, prolongation over time, internal FeO are progressively oxidized.As pelletizing is contained within TiO2, if FeO oxidations are incomplete, will
Generate a certain amount of pseudobrookite.Pseudobrookite is a kind of mineral for being difficult to and aoxidizing in itself, and the generation of pseudobrookite in pelletizing will
Hinder the further oxidation of FeO.
Thus, during pelletizing production, in finished pellet to be made, FeO contents are relatively low, it should the diameter of strict control green-ball.
According to 950 DEG C of preheating temperature, oxygen oxygen content 15% in air-flow, the condition of air flow rate 15L/min, it is ensured that oxygenation efficiency is 80%
Can meet above and require, therefore the diameter of green-ball should be controlled within 12mm, while the diameter of green-ball can not be too little, one
As should in more than 8mm, therefore vanadium-titanium pellet oxidation green-ball be preferably 8-12mm.With reference to the existing working condition of enterprise, if
All in 8-12mm, there is technological requirement too high, it is impossible to the problem of realization in control to the diameter of green-ball, even if realizing, cost
It is too high, it is unfavorable for increasing the benefit.It has been investigated that, it is 8-20mm currently used for the scope of the green-ball diameter of oxidation, works as 8-20mm
Green-ball in have more than 70% the green-ball of 8-12mm be remarkably improved the equal effect of green-ball drying and preheating, while in follow-up roasting
It is not easy to form layering during consolidation, it is to avoid shell and difficult oxidation pseudobrookite are generated, and hinder the oxidation of internal layer.Therefore it is of the invention
In, diameter accounts for total more than 70% in the green-ball of 8-14mm scopes.
Meanwhile, control green-ball diameter after, in order to avoid bead is crushed by drying grate cloth, the present invention by fabric thickness by
200mm is controlled in the range of 180-190mm.
2nd, inventor goes back the oxygenation efficiency situation of change of pelletizing under experimental study different preheating temperatures, different time, such as Fig. 2
It is shown.Other test rigid conditions：Pelletizing diameter 12mm, in air-flow, oxygen content is 15%, air flow rate 15L/min.From
Can be seen that in Fig. 2：In the case of other experimental conditions keep identical, preheating temperature becomes in the range of 800 DEG C～1000 DEG C
During change, with the raising of preheating temperature, the oxygenation efficiency of pelletizing is continuously increased.When preheating temperature is more than 900 DEG C, preheating time exceedes
During 10min, the increasing degree of pelletizing oxygenation efficiency is significantly reduced, and the value that tends towards stability；And preheating temperature be less than 900 DEG C when, pelletizing
The increasing degree of oxygenation efficiency is significantly reduced and the time needed for the value that tends towards stability is more than 15min.It is 10min when preheating time, in advance
When hot temperature is 800 DEG C, 850 DEG C, 900 DEG C, 950 DEG C and 1000 DEG C, the oxygenation efficiency of pelletizing is respectively 58.12%, 69.18%,
77.22%th, 81.56% and 85.27%.
When Fig. 2 is also shown that preheating temperature changes in the range of 800 DEG C～1000 DEG C, impact of the temperature to pelletizing oxygenation efficiency
Degree is different：1. in the range of 800～950 DEG C, impact of the temperature to oxygenation efficiency is larger, in this temperature range, improves temperature,
In pelletizing, the oxygenation efficiency increasing degree of FeO is larger；2., in the range of 950～1000 DEG C, impact of the temperature to oxygenation efficiency diminishes,
In this temperature range, temperature is improved, the oxygenation efficiency increasing degree of FeO is less in pelletizing；3. in the range of 0-5min, oxidation rate compared with
Hurry up, impact of the oxidization time to oxygenation efficiency is larger；4., after 5min, oxidation rate slows down.
For Tables 1 and 2 scene production conditions, the flue-gas temperature of preheated one-section and two-stage nitration is low, and pelletizing
The time maintained when preheating temperature is more than 900 DEG C, the oxygenation efficiency of pelletizing was very low less than 3min, and only 32.5%.Thus, scene
The temperature that drying grate preheating section is properly increased in production process is necessary, according to above-mentioned 1. 2. 3. 4. result of study, should ensure that
The time that pelletizing is kept at a temperature of more than 950 DEG C is more than 5min.
3rd, preheated one-section is the important process section of drying grate, is that green-ball is dried the transition stage with preheating, controls the section
Technological effect to improve pelletizing oxygenation efficiency play an important role.
Preheated one-section temperature is relatively low as shown in Table 1,400-482 DEG C, and the pelletizing on this section of second section bellows top still has part
Water, is not completely dried.The reason for causing the process section pre-heat effect difference includes：
1) the dry section effect of drum is poor：172 DEG C of inlet temperature, less than 50 DEG C, the dry section of drum is that one group of chimney is directly arranged to outlet temperature
Put, stack draught is less, the hot waste gas come by the machine conveying of drum dry-air blast is poor to the penetrance of the bed of material, thus, actual drying effect
It is poor.
2) preheated one-section temperature, is limited to green-ball and is dried demand.After temperature is improved, the green-ball containing moisture can be caused on the contrary
Can burst, produce a large amount of dust and broken ball, affect bed of material penetrance, affect whole thermal regulation.
The partially dry process function of preheated one-section, the impact to pelletizing oxygenation efficiency are mainly：
1) make pelletizing thermal technology drying stage time-consuming longer, the pelletizing main oxidation stage is delayed, shorten pelletizing preheating time.
2) drying, the preheating fade function of green-ball are weakened, this section of green-ball is at 300 DEG C or so, into after preheating two-stage nitration, warm
Degree rises sharply to 900 DEG C or so, will also result in the explosion of pelletizing, produces dust and broken ball, affects bed of material penetrance, reduces preheating two
The oxygenation efficiency of section pellet.
For above-mentioned situation, the measure that the present invention takes is：
A increases by one group of chimney in the dry section of drum, is evacuated using multigroup chimney, increases draft.Contrast table 1 and the drum of table 3 are dry
Segment data, the dry section outlet temperature of drum rise to 72 by 49, and the dry segment trailer green-ball moisture content of drum is reduced to 6.4% by 7.1%.Explanation has
More hot waste gas are perforated through the bed of material, have taken away the more moisture of green-ball, so as to strengthen the drying effect of green-ball.
B guides preheated one-section into by two-stage nitration flue gas is preheated, and makes preheated one-section petticoat pipe temperature that terraced distribution is presented, is stepped up,
Be conducive to strengthening pelletizing drying and preheating Transition Technology function.Specifically, the present invention is between preheated one-section and preheating two-stage nitration
Partition wall punching, the flue gas of preheating two-stage nitration first segment bellows top petticoat pipe is guided into preheated one-section by the hole beaten on partition wall, from
And preheated one-section temperature is improved, by the improvement of green-ball drying effect, it is that preheated one-section changeover portion is laid a good foundation.
4th, sintering temperature and firing rate are the key factors for affecting pellet roasting, by different times pellet section
Observation, with reference to pelletizing oxidizing roasting mechanism, the oxidation behavior of sunykatuib analyses pelletizing different temperatures, inventor draw following knot
Really：
Temperature is too high：1300 DEG C are reached, finished ball nodulizing FeO contents up to more than 5%.Pellet profile morphology is：Point
Substantially, internal layer section is smooth, and bright silver, metallic luster are more apparent, outer layer Lycoperdon polymorphum Vitt, and section frosted shape, metallic luster are on the weak side for layer.Oxygen
Change behavior：Oxidizing temperature is too high or programming rate is too fast, consolidates outer oxide very fast, and the diffusion of bloodstone crystal grain strengthens, and produces
Raw recrystallization and glomerocryst are grown up, and the hole between granule is rounded, and porosity declines, and sphere volume shrinks, and each granule of outer layer is connected into
One fine and close entirety.The fine and close and pellet oxidation heat liberation of outer layer causes the relatively outer floor height of internal layer temperature, and internal layer occurs
Fe3O4Recrystallization consolidation, oxidation are incomplete, generate a large amount of dysoxidizable pseudobrookites.
Proper temperature：Sintering temperature is lasting between 1150-1180 DEG C, and finished ball nodulizing FeO contents are in 2%-3%.Ball
Nodulizing profile morphology is：Without substantially layering, Lycoperdon polymorphum Vitt has metallic luster, section frosted shape.Oxidation behavior：Oxidizing temperature and intensification
Speed well, makes pellet Internal oxidation rate more than consolidation rate, and pellet major part FeO oxidations are complete, final to aoxidize and solid
Knot is relatively complete, inside and outside no obvious lamination.
Temperature is too low：When temperature is less than 1100 DEG C, finished ball FeO contents are in 3%-5%.Pelletizing profile morphology is：Substantially
Layering, outer layer Lycoperdon polymorphum Vitt, metallic luster, section frosted shape, internal layer concentrate graininess, coarse section, black gray expandable, without metallic luster.
Oxidation behavior：Oxidizing temperature is too low or programming rate is slower, and oxidation and consolidation are incomplete, internal layer Fe3O4Recrystallization consolidation is obvious
Deficiency, pellet strength are relatively low.
By upper：Temperature and programming rate are the principal elements for affecting pelletizing oxidation and consolidating, and sintering temperature is too high or too low
The reduction of oxygenation efficiency will be caused, the especially too high impact to oxidation behavior of sintering temperature more very (mainly produces line
Group's high-temperature duration is enough).Therefore according to actual production effect, the application proposes sintering temperature at 1150-1180 DEG C,
It is relatively complete in the oxidation of 1150-1180 DEG C of gained pelletizing and the degree of consolidation, wherein, the sintering temperature in table 4 is 1180 DEG C.
The ultimate principle and main feature of the present invention are the foregoing described, the description of description simply illustrates the original of the present invention
Reason, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes and improvements
Both fall within scope of the claimed invention.
Claims (6)
1. a kind of vanadium-titanium pellet oxidation technology, green-ball is carried out following process successively：Forced air drying, convulsion are dried, preheat, roasting
Burning, ring are cold；Wherein, forced air drying, convulsion drying, preheating is carried out in drying grate；
Characterized in that, in all green-balls, diameter accounts for more than 70% in the green-ball of 8-14mm scopes, and the fabric thickness of drying grate is
180-190mm。
2. a kind of vanadium-titanium pellet oxidation technology as claimed in claim 1, it is characterised in that sintering temperature is 1150 DEG C-
1180℃。
3. a kind of vanadium-titanium pellet oxidation technology as claimed in claim 1, it is characterised in that preheating includes preheated one-section and in advance
Hot two-stage nitration；When preheating, preheating two-stage nitration flue gas is guided into preheated one-section, make preheated one-section petticoat pipe temperature that step point is presented
Cloth.
4. a kind of vanadium-titanium pellet oxidation technology as claimed in claim 3, it is characterised in that described that preheating two-stage nitration flue gas is drawn
The step of to preheated one-section, includes：Partition wall punching between preheated one-section and preheating two-stage nitration, will preheating two-stage nitration first segment bellows
The flue gas of top petticoat pipe guides preheated one-section into by the hole beaten on partition wall.
5. a kind of vanadium-titanium pellet oxidation technology as claimed in claim 4, it is characterised in that air blast is extracted using multigroup chimney
The flue gas produced in dry run.
6. a kind of vanadium-titanium pellet oxidation technology as claimed in claim 4, it is characterised in that when preheating, pelletizing is big
The time of more than 5min is kept at a temperature of 950 DEG C.
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| CN201611258567.4A CN106544497A (en) | 2016-12-30 | 2016-12-30 | A kind of vanadium-titanium pellet oxidation technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111020180A (en) * | 2019-11-13 | 2020-04-17 | 鞍钢集团矿业有限公司 | Oxidation method for optimizing thermal parameters of fine-grained magnetite concentrate pellets |
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| CN111020180A (en) * | 2019-11-13 | 2020-04-17 | 鞍钢集团矿业有限公司 | Oxidation method for optimizing thermal parameters of fine-grained magnetite concentrate pellets |
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