CN106755965A - Vanadium-titanium pellet method for oxidation - Google Patents
Vanadium-titanium pellet method for oxidation Download PDFInfo
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- CN106755965A CN106755965A CN201611258224.8A CN201611258224A CN106755965A CN 106755965 A CN106755965 A CN 106755965A CN 201611258224 A CN201611258224 A CN 201611258224A CN 106755965 A CN106755965 A CN 106755965A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
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Abstract
The present invention relates to pellet oxidation field, a kind of vanadium-titanium pellet method for oxidation is disclosed, green-ball oxidation effectiveness is improved, so as to improve the quality of finished ball nodulizing.Green-ball is carried out following treatment by the present invention successively：Forced air drying, exhausting are dried, preheated, being calcined, ring is cold；Wherein, forced air drying, exhausting drying, preheating is carried out in drying grate；Sintering temperature is 1150 DEG C 1180 DEG C.The present invention is applied to vanadium-titanium pellet and aoxidizes 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 vanadium-titanium pellet method for oxidation.
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 expands, 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 turned into
The matter of utmost importance of current pelletizing industry.
FeO contents are one of main physical and chemical indexs of pellet, and FeO contents pellet reproducibility high is just reduced, 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 intensity pellet high, Well-recovered to blast furnace can expire
The smelting of sufficient blast furnace needs.
Generally comprised in pellet oxidation technology forced air drying, exhausting drying, preheated one-section, preheating two sections, roasting, ring it is cold
One section, cold two sections of ring, the step such as cold three sections of ring.Wherein, forced air drying, exhausting drying, preheated one-section, two sections of preheating are in drying grate
In carry out, roasting carried out in rotary kiln, cold one section of ring, cold two sections of ring, cold three sections of ring are carried out in central cooler.Exhausting is dry
, from three sections of wind out of central cooler, the dry thermal source of exhausting is from two sections of hot waste gas of recovery of preheating, preheating one for low temperature hot blast
Hot waste gas of the section thermal source from cold two sections of ring, the hot waste gas of the thermal source from rotary kiln of two sections of preheating.
The content of the invention
The technical problem to be solved in the present invention is：A kind of vanadium-titanium pellet method for oxidation 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 adopted by the present invention is：Vanadium-titanium pellet method for oxidation, green-ball is entered successively
The following treatment of row：Forced air drying, exhausting are dried, preheated, being calcined, ring is cold；Wherein, forced air drying, exhausting are dried, preheated in chain
Carried out in comb machine；Sintering temperature is 1150 DEG C -1180 DEG C, so that pellet Internal oxidation rate is more than consolidation rate, pelletizing
Ore deposit major part FeO oxidations are complete, and final oxidation and consolidation are relatively completely, inside and outside without obvious lamination.Roasting connects completion
Pellet profile morphology afterwards has metallic luster, section frosted shape without substantially layering, grey.
Further, preheating includes two sections of preheated one-section and preheating；Preheating when, will preheat two sections of flue gases guide into it is 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 sections of flue gases guide preheated one-section into includes：In preheated one-section and preheating two
Partition wall punching between section, the flue gas that will preheat two sections of first segment bellows top petticoat pipes guides preheating one into by the hole beaten on partition wall
Section.
Further, in all green-balls, diameter accounts for more than 70%, the fabric thickness of drying grate in the green-ball of 8-14mm scopes
It 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,
Shell and difficult oxidation pseudobrookite generation are avoided, the oxidation of internal layer is hindered.
When preheating, pelletizing keeps the time of more than 5min at a temperature of more than 950 DEG C so that warm-up phase can be protected
The card enough high-temperature oxydation time.
Further, the flue gas (hot waste gas) produced during forced air drying is extracted 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.
The beneficial effects of the invention are as follows：By the above-mentioned process modification of the present invention, preheated in vanadium-titanium pellet oxidizing process
And sintering temperature gradient further tends to gently, consolidate pellet internal oxidation uniform, reduces dysoxidizable pseudobrookite
Generation 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.
Brief 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 is existing drying grate technological parameter, and table 2 is existing time brickkiln central cooler parameter, and table 3 is drying grate technological parameter, table
4 is brickkiln central cooler parameter of the present invention.
The existing drying grate technological parameter of table 1
2 existing times brickkiln central cooler parameters of table
The drying grate technological parameter of the present invention of table 3
The present invention of table 4 returns brickkiln central cooler parameter
1st, inventor is studied by pelletizing production, and pelletizing is in pre- thermal oxidation process, and its diameter is bigger, internal
FeO be more difficult to that oxidation is complete, then FeO contents are higher in the finished ball nodulizing for producing.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 light microscope also
Can substantially find that the titanomagnetite of the haplotypite, pseudobrookite in pre- hot-bulb and remaining is mainly distributed on Fe2O3Particle it
Between, occur in cementing form more.The pelletizing of current produced on-site is relatively large in diameter, and most of is 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 32% or so.If FeO oxidations are incomplete, by with pelletizing in TiO2A certain amount of iron plate titanium of reaction generation
Ore deposit.And pseudobrookite is in itself a kind of mineral for being difficult to and aoxidizing, its generation will hinder the further oxidation of FeO, and this is to cause into
FeO higher main cause in product ball.Also found simultaneously, drying grate 200mm fabric thickness technological designs limit green-ball diameter
Reduction.After green-ball diameter control lives in below 12mm, compression strength reduction, 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
Influence 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.Curve shows in Fig. 1, and influence of the pelletizing diameter to oxygenation efficiency is larger.In identical
Under preheating condition, with the increase of diameter, pelletizing oxygenation efficiency is gradually reduced.When pelletizing diameter increases to 16mm from 12mm, oxygen
The amplitude of rate reduction is smaller；When diameter continues to increase to 20mm, the amplitude of pelletizing oxygenation efficiency reduction is larger.Work as preheating temperature
It is 950 DEG C, preheating time is 10min, the pelletizing oxygenation efficiency of a diameter of 12mm and 16mm is respectively 81.56% and 76.15%, 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
For the oxidation of pelletizing is carried out from surface to center, in the oxidation incipient stage, the FeO on top layer is aoxidized first, forms Fe2O3Shell
Layer, extension over time, internal FeO is progressively oxidized.Because pelletizing is contained within TiO2, if FeO oxidations are incomplete, will
Generate a certain amount of pseudobrookite.Pseudobrookite is in itself a kind of mineral for being difficult to and aoxidizing, and the generation of pseudobrookite will in pelletizing
Hinder the further oxidation of FeO.
Thus, FeO contents are relatively low during pelletizing production, in finished pellet to be made, 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 small, one
As should be in more than 8mm, therefore the green-ball of vanadium-titanium pellet oxidation is 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, the scope currently used for the green-ball diameter of oxidation is 8-20mm, 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 being subsequently calcined
It is not easy to form layering during consolidation, it is to avoid shell and difficult oxidation pseudobrookite generation, hinders 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 drying grate cloth crushes bead, 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, oxygen content is 15%, air flow rate 15L/min in air-flow.From
Be 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, influence of the temperature to pelletizing oxygenation efficiency
Degree is different：1. in the range of 800~950 DEG C, influence of the temperature to oxygenation efficiency is larger, in this temperature range, improves temperature,
The oxygenation efficiency increasing degree of FeO is larger in pelletizing；2. in the range of 950~1000 DEG C, influence of the temperature to oxygenation efficiency diminishes,
In this temperature range, temperature is improved, the oxygenation efficiency increasing degree of FeO is smaller in pelletizing；3. in the range of 0-5min, oxidation rate compared with
Hurry up, influence of the oxidization time to oxygenation efficiency is larger；4. after 5min, oxidation rate slows down.
For Tables 1 and 2 scene production conditions, preheated one-section and two sections of flue-gas temperature are relatively 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 keeps 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 the transition stage that green-ball is dried and preheated, and 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 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 smaller, the hot waste gas come by the machine conveying of drum dry-air blast, the penetrability to the bed of material is poor, thus, actual drying effect
It is poor.
2) preheated one-section temperature, is limited to green-ball and dries 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, influence bed of material penetrability, influence whole thermal regulation.
The partially dry process function of preheated one-section, the influence to pelletizing oxygenation efficiency is mainly：
1) make pelletizing thermal technology drying stage time-consuming more long, the pelletizing main oxidation stage is delayed, and shortens pelletizing preheating time.
2) drying, the preheating fade function of green-ball are weakened, this section of green-ball is warm into after two sections of preheating at 300 DEG C or so
Degree rises sharply to 900 DEG C or so, will also result in the explosion of pelletizing, produces dust and broken ball, influences bed of material penetrability, 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 rises 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, the more moisture of green-ball have been taken away, so as to strengthen the drying effect of green-ball.
B will preheat two sections of flue gases and guide preheated one-section into, make preheated one-section petticoat pipe temperature that terraced distribution is presented, and be stepped up,
Be conducive to strengthening pelletizing drying and preheating Transition Technology function.Specifically, the present invention is between two sections of preheated one-section and preheating
Partition wall punching, the flue gas that will preheat two sections of first segment bellows top petticoat pipes guides preheated one-section into by the hole beaten on partition wall, from
And preheated one-section temperature is improved, it is that preheated one-section changeover portion is laid a good foundation by the improvement of green-ball drying effect.
4th, sintering temperature and firing rate are the key factors for influenceing pellet roasting, by different times pellet section
Observation, with reference to pelletizing oxidizing roasting mechanism, the oxidation behavior of sunykatuib analysis pelletizing different temperatures, inventor draws following knot
Really：
Temperature is too high：1300 DEG C are reached, finished ball nodulizing FeO contents are up to more than 5%.Pellet profile morphology is：Point
Substantially, internal layer section is smooth, and bright silver, metallic luster is more apparent, outer layer grey, and section frosted shape, metallic luster is 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, the diffusion enhancing of bloodstone crystal grain, and produces
Raw recrystallization and glomerocryst are grown up, and the hole between particle is rounded, and porosity declines, and sphere volume shrinks, and each particle of outer layer is connected into
One entirety of densification.The densification of outer layer and pellet oxidation heat liberation cause the relatively outer floor height of internal layer temperature, and internal layer occurs
Fe3O4Recrystallization consolidation, oxidation is incomplete, generates a large amount of dysoxidizable pseudobrookites.
Proper temperature：Sintering temperature continues between 1150-1180 DEG C, and finished ball nodulizing FeO contents are in 2%-3%.Ball
Nodulizing profile morphology is：Without substantially layering, grey 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 completely, inside and outside without 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 grey, 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 is relatively low.
By upper：Temperature and programming rate are the principal elements for influenceing pelletizing oxidation and consolidation, and sintering temperature is too high or too low
The reduction of oxygenation efficiency will be caused, the especially too high influence 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.
General principle of the invention and main feature are the foregoing described, the description of specification is explanation original of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements
All fall within the protetion scope of the claimed invention.
Claims (6)
1. vanadium-titanium pellet method for oxidation, following treatment is carried out by green-ball successively：Forced air drying, exhausting dry, preheating, roasting,
Ring is cold；Wherein, forced air drying, exhausting drying, preheating is carried out in drying grate；
Characterized in that, sintering temperature is 1150 DEG C -1180 DEG C.
2. vanadium-titanium pellet method for oxidation as claimed in claim 1, it is characterised in that preheating includes preheated one-section and preheats two
Section；When preheating, two sections of flue gases will be preheated and guide preheated one-section into, make preheated one-section petticoat pipe temperature that terraced distribution is presented.
3. vanadium-titanium pellet method for oxidation as claimed in claim 2, it is characterised in that it is described will preheat two sections of flue gases guide into it is pre-
Hot one section the step of, includes：Partition wall punching between two sections of preheated one-section and preheating, will preheat two sections of first segment bellows tops
The flue gas of petticoat pipe guides preheated one-section into by the hole beaten on partition wall.
4. vanadium-titanium pellet method for oxidation as claimed in claim 3, it is characterised in that in all green-balls, diameter is in 8-14mm
The green-ball of scope accounts for more than 70%, and the fabric thickness of drying grate is 180-190mm.
5. vanadium-titanium pellet method for oxidation as claimed in claim 4, it is characterised in that when preheating, pelletizing is more than 950
The time of more than 5min is kept at a temperature of DEG C.
6. vanadium-titanium pellet method for oxidation as claimed in claim 1, it is characterised in that forced air drying is extracted using multigroup chimney
During produce flue gas.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110878388A (en) * | 2019-11-29 | 2020-03-13 | 四川大裂谷钒业有限公司 | Method for roasting vanadium-containing material by using chain grate and rotary kiln |
| 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 |
| CN112391525A (en) * | 2020-11-27 | 2021-02-23 | 攀枝花钢企米易白马球团有限公司 | Preparation method and preparation system of vanadium-titanium pellets |
| CN113373300A (en) * | 2021-05-07 | 2021-09-10 | 北京卡卢金热风炉技术有限公司 | Preparation method and device of oxidized pellets |
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Cited By (5)
| 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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| CN110878388A (en) * | 2019-11-29 | 2020-03-13 | 四川大裂谷钒业有限公司 | Method for roasting vanadium-containing material by using chain grate and rotary kiln |
| CN112391525A (en) * | 2020-11-27 | 2021-02-23 | 攀枝花钢企米易白马球团有限公司 | Preparation method and preparation system of vanadium-titanium pellets |
| CN113373300A (en) * | 2021-05-07 | 2021-09-10 | 北京卡卢金热风炉技术有限公司 | Preparation method and device of oxidized pellets |
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Application publication date: 20170531 |
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