CN101338363A - High titan type low FeO content sinter and method for preparing same - Google Patents
High titan type low FeO content sinter and method for preparing same Download PDFInfo
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- CN101338363A CN101338363A CNA2008103042301A CN200810304230A CN101338363A CN 101338363 A CN101338363 A CN 101338363A CN A2008103042301 A CNA2008103042301 A CN A2008103042301A CN 200810304230 A CN200810304230 A CN 200810304230A CN 101338363 A CN101338363 A CN 101338363A
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Abstract
The invention belongs to the agglomeration field of iron ore, in particular to a high titanium sintering ore with a low FeO content and a preparation method thereof. The technical problem needed to be solved by the invention is to provide a method for preparing the high titanium sintering ore with a low FeO content by taking the v-ti magnetite concentrate ore specially owned by Panzhihua as the material. The invention is mainly characterized in that the sintering material is the high titanium v-ti magnetite concentrate ore; when batching, the carbon addition amount is 2.6 to 3.2 percent; the FeO content of the sintering ore obtained by sintering is 6.5 to 9.5 percent; the FeO content is preferably to be 7.0 to 8.5 percent. The FeO content of the sintering ore is controlled to be 6.5 to 9.5 percent by controlling a fuel mixture ratio with a high precision, thus ensuring the intensity of the sintering ore, improving the performance of the metallurgy and achieving the optimized effect on the aspects of blast furnace metallurgy, cost control and environment protection.
Description
Technical field
The invention belongs to iron ore agglomeration field, be specifically related to high titan type low FeO content sinter and preparation method thereof.
Background technology
For different FeO values a lot of exploratory studys have been carried out in this field that influences of sintering performance, main conclusions point out that too high or too low FeO value all is unfavorable for improving agglomerate yield and quality and metallurgical performance.
The development trend of this area all is devoted to reduce sintering mine FeO content at present, because there is following shortcoming in high FeO content sinter:
(1) the agglomerate mineral composition is poor, as the bonding phase, easily produces the glassiness with the silicate liquid phase.The agglomerate macrostructure is macropore thin-walled or the few compact shape of pore, and sinter strength is poor.
(2) sintering process parameter falls behind, and sintering is joined the charcoal height, and bed thickness is thin, is unfavorable for improving yield and quality.
(3) owing to be high temperature sintering, sintering produced and melted, and vertical sintering speed is slow, and yield and quality is low, the energy consumption height.Too high FeO content also to influence equipment life greatly.
(4) the agglomerate reductibility is poor, blast-furnace smelting working of a furnace shakiness, and direct motion is not good, and utilization coefficient is low, the coke ratio height.
(5) high FeO content agglomerating solid fuel consumption height, CO
2Quantity discharged is big, influences environmental friendliness, has run counter to about cutting down CO
2The Kyoto Protocol treaty of quantity discharged (coming into force in 2005).
Be controlled at 5～6% the agglomerate w (FeO) of external as Japanese, the Western European countries, have in addition be reduced to 4.5%.The w of present most of enterprises (FeO) also is controlled at 8-10% even above level, as holds steel vanadium titanium agglomerate w (FeO) up to more than 14%.Even different ore kinds, join ore deposit structure and processing parameter in that to join the FeO content that generates under the identical condition of charcoal amount also different.
Flos Bombacis Malabarici high-titanium type vanadium ilmenite concentrate contains the TiO more than 13%
2Sintering character obviously is different from common ore deposit, the cardinal principle of the distinctive low FeO content sintering technology of high-Ti type V-Ti magnetite concentrate is too high based on the control of FeO content, will produce the uhligite (CaOTiO that sinter strength is played destruction under high temperature and reducing atmosphere condition
2), the generation that will suppress this mineral in sintering process must reduce sintering mine FeO content.FeO content also is devoted to reduce in the ordinary sinter ore deposit, but because sintering mechanism is different, and subsidiary conditions are not worked good and caused that to reduce FeO content effect relatively poor.
But be not the FeO content of requirement reduction agglomerate simply; the contriver utilizes the distinctive v-ti magnetite concentrate of Flos Bombacis Malabarici; be equipped with the agglomerate that multiple iron ore prepares FeO content net effect the best; guarantee the intensity of agglomerate; improve metallurgical performance, reaching the optimization effect aspect blast-furnace smelting, cost control and the environment protection.
Summary of the invention
It is the method for feedstock production high titan type low FeO content sinter with the distinctive v-ti magnetite concentrate of Flos Bombacis Malabarici that technical problem solved by the invention provides a kind of.
The preparation method of high titan type low FeO content sinter of the present invention comprises the steps: A, batching, B, mixing, C, cloth, D, igniting, sintering, E, heat fragmentation, F, heat screening, G, cooling, H, screening.It is characterized in that: raw materials for sintering is a high-Ti type V-Ti magnetite concentrate, and its component content contains by weight: TFe 52-55%, FeO 29-32%, SiO
23-4%, CaO 1.5-2.0%, MgO 2.0-2.5%, Al
2O
33.0-4.5%, V
2O
50.5-0.6%, TiO
213-15%, S0.4-0.6%; Wherein, steps A when batching mixed carbon comtent is 2.6-3.2%, sintering and the FeO content of agglomerate be 6.5-9.5%.The inventive method be mode by the fuel metering proportioning in order to control compound fixed carbon content, control sintering mine FeO content with this.The applied fuel of the present invention is coke powder or hard coal, and by weight percentage, coke powder is that 3-7% or the hard coal that adopts 4-8% substitute, and then corresponding compound mixed carbon comtent is 2.6-3.2%.
When the FeO content of the agglomerate that preparation gets when adopting composite index law to judge mixed carbon comtent for 2.6-3.2% was 6.5-9.5%, net effects such as its tumbler index, utilization coefficient, solid burnup, low temperature reduction degradation index, reduction degree were better.Especially when mixed carbon comtent be 2.8-3.0%, sintering and the FeO content of agglomerate when being 7.0-8.5%, best results has guaranteed the intensity of agglomerate to reach doulbe-sides' victory in cost control and metallurgical effect.The automatic blending technology is adopted in the precision control of fuel ratio, promptly by computer control feed disk and electronic belt scale.If inaccurate to the precision control of joining the charcoal amount, can cause that FeO content does not reach requirement in the final agglomerate, influence the subsequent smelting quality.
Obviously, according to foregoing of the present invention,,, can also make modification, replacement or the change of other various ways not breaking away under the above-mentioned basic fundamental thought of the present invention prerequisite according to the ordinary skill knowledge and the customary means of this area.
The embodiment of form is described in further detail foregoing of the present invention again by the following examples.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following example.All technology that realizes based on foregoing of the present invention all belong to scope of the present invention.
Embodiment
This agglomerate of the present invention belongs to high titan type low FeO content, and the sintering main raw material is a high-Ti type V-Ti magnetite concentrate, and its component content contains by weight: TFe 52-55%, FeO 29-32%, SiO
23-4%, CaO 1.5-2.0%, MgO2.0-2.5%, Al
2O
33.0-4.5%, V
2O
50.5-0.6%, TiO
213-15%, S 0.4-0.6%; Wherein, mixed carbon comtent is 2.6-3.2% during sintered material, sintering and sintering mine FeO content be 6.5-9.5%.
The committed step that the present invention prepares agglomerate is to control the precision of fuel ratio, what use is the automatic blending technology, " closed feed disk+electronic belt scale+computer " is basic auxiliary facility, the setting of fuel ratio is finished by computer with adjusting, realize control automatically, fuel band is more much higher than the electronic belt scale control accuracy of other material, the control accuracy of fuel electronic scale requires to reach 0.5 ‰, the fuel fluctuation controls to 0.03-0.05kg/m, purpose is precisely to control sintering mine FeO content, reduces vibration frequency.Fuel mass control is by sample examination of fixed place and time, mainly detects fuel granularity, moisture, the ash index of grading, and detects once in per 4 hours.Other method control fuel ratio precision with detect fuel mass also can, just effect is different.If inaccurate to the precision control of joining the charcoal amount, can cause that FeO content does not reach requirement in the final agglomerate, influence the subsequent smelting quality.
Usually, raw materials for sintering can be made up of the component of following weight per-cent:
V-ti magnetite concentrate 50-58%, Australian fine ore 8-14%, domestic higher-grade fine ore 10-15%, domestic middle grade fine ore 2-6%, Wingdale 4-8%, unslaked lime 7%, coke powder 3-7% or hard coal 4-8%; Join the 30-50% that returns mine during batching outward.Components of iron ore sees Table 1.
Return mine and be that the screen underflow of each time of agglomerate screening, major ingredient are agglomerate and the unsintered compounds of granularity＜5mm; And the finished product screen underflow that produces down with the blast furnace ditch in the sintering process, granularity＜5mm, major ingredient are little agglomerate.
The iron ore composition (%) that table 1 sintering uses
| Material name | TFe | FeO | SiO 2 | CaO | MgO | AL 2O 3 | H 2O |
| V-ti magnetite concentrate | 53.92 | 31.87 | 3.32 | 1.13 | 2.40 | 4.10 | 10.76 |
| Australia's fine ore | 62.76 | 0.28 | 4.63 | // | // | 2.48 | 6.81 |
| Domestic higher-grade fine ore | 59.29 | 22.82 | 6.21 | 3.62 | 1.98 | 2.04 | 7.21 |
| Grade fine ore in domestic | 47.19 | 1.23 | 18.66 | 2.32 | 0.55 | 4.55 | 6.81 |
Annotate: TFe is an iron level.Wherein, V in the v-ti magnetite concentrate
2O
5Content be 0.555%, TiO
2Content be 12.85%, granularity＜200 purposes account for 50%.
Agglomerate is the preparation method may further comprise the steps: A, batching, and B, mixing, C, cloth, D, igniting, sintering, E, heat fragmentation, F, heat screening, G, cooling, H, screening can be carried out blast-furnace smelting after the screening.Particularly, step B mixing can be carried out twice mixing; The screening of step H can be carried out sintering screening and ditch screening down.
Wherein, the moisture content of control compound is 7.20 ± 0.20% after mixing, and facts have proved to be best suited for the moisture that v-ti magnetite concentrate is granulated to be needed.The v-ti magnetite concentrate mix moisture is too high and cross the low granulation that all is unfavorable for, the too high excessive moistening layer that will form of the too high formation of moisture worsens sintering, and moisture is crossed to hang down will influence granulating efficiency.
Wherein, bed depth is 500-680mm during cloth.This scope belongs to that thick bed of material cloth can prolong the agglomerate high temperature hold-time and crystallization is abundant, improves sinter strength.
Wherein, the ignition control condition is as follows: the igniting negative pressure is 400 * 9.8Pa, and combustion chamber draft is 0-20Pa, and be 2min ignition time, and ignition temperature is 1100 ± 30 ℃.Igniter fuel is a coke-oven gas, calorific value 0.0167GJ/m
3, pressure is greater than 2500Pa.The lower negative pressure firing technique is adopted in igniting of the present invention, can fully guarantee the effect of lighting a fire.
Wherein, sintering condition is as follows: sintering negative pressure 12000-13500Pa, be responsible for 100-115 ℃ of spent air temperture, sintering temperature is 1100-1450 ℃, sintering temperature was then low when FeO content was low, sintering temperature was then high when FeO content was high, but the optimal sintering temperature under the best FeO content condition must be in this temperature range.
Agglomerate of the present invention adopts deep-bed sintering and high basicity (basicity is controlled at 2.0-2.5) sintering, can guarantee that agglomerate its intensity under the condition of low FeO content can not reduce.Deep-bed sintering can prolong high temperature hold-time assurance agglomerate sufficient crystallising, and high-basicity sintering can increase amount of liquid phase and calcium ferrite mineral content, but still can implement under other basicity condition.
Embodiment 1
Embodiment uses the raw materials for sintering of following proportioning: v-ti magnetite concentrate 55%, Australian fine ore 10%, domestic higher-grade fine ore 12%, domestic middle grade fine ore 3%, Wingdale 6%, unslaked lime 7% is joined in addition and is returned mine 35%.Fuel is coke powder or hard coal, and dosage of coke is that 3-7% or hard coal proportioning are 4-8% (corresponding compound mixed carbon comtent is 2.2-3.8%), has prepared the agglomerate of 9 batches of different FeO content, and its technique effect sees Table 2 with relevant smelting performance index.Other detects the main thing phase and the content thereof of the agglomerate of part batch different FeO content, the results are shown in Table 3.
1, technique effect
The different FeO content of table 2 are to the result that influences of agglomerate yield and quality and energy consumption
| Lot number | Join carbon % | Sintering mine FeO % | Sintering velocity mm/min | Barrate strength % | Yield rate % | Utilization coefficient tm 2·h | Wear-resistant index % | Solid burnup kg/t | RDI -3.15mm％ | RI ％ |
| 1 | 2.2 | 4.34 | 23.32 | 66.33 | 57.04 | 1.180 | 7.35 | 59.43 | 84.91 | 86.75 |
| 2 | 2.4 | 5.39 | 23.09 | 68.67 | 60.80 | 1.254 | 7.16 | 60.21 | 74.84 | 84.44 |
| 3 | 2.6 | 6.59 | 22.86 | 70.28 | 65.60 | 1.296 | 7.0 | 62.59 | 65.27 | 83.32 |
| 4 | 2.8 | 7.24 | 22.53 | 71.02 | 68.10 | 1.335 | 6.92 | 65.15 | 61.22 | 82.61 |
| 5 | 3.0 | 8.44 | 21.90 | 72.25 | 70.69 | 1.361 | 6.80 | 67.24 | 59.76 | 80.94 |
| 6 | 3.2 | 9.37 | 20.87 | 71.86 | 71.23 | 1.342 | 6.67 | 71.19 | 57.91 | 76.82 |
| 7 | 3.4 | 10.57 | 18.61 | 71.50 | 71.08 | 1.293 | 7.20 | 76.43 | 54.29 | 73.53 |
| 8 | 3.6 | 11.42 | 17.24 | 71.14 | 70.85 | 1.226 | 7.33 | 81.55 | 54.82 | 72.26 |
| 9 | 3.8 | 13.35 | 16.34 | 70.70 | 70.76 | 1.197 | 7.42 | 85.20 | 55.13 | 70.98 |
Table 3 partially sinters ore deposit mineral composition and volume content scope (%) thereof
| Sintering mine FeO | Haplotypite (rhombohedral iron ore) | Titanomagnetite (magnetite) | Ferrous acid one calcium | Dicalcium ferrite | Glassy phase | Uhligite | Schorlomite | The silicic acid salt face | Pyrrhotite | Free CaO | Tricalcium silicate etc. |
| 4.34 | 25-26 | 28-32 | 18-21.7 | 2-3 | 4-5 | Accidental | 0.5-1 | 13-14 | Accidental | 1-2 | 1-2 |
| 6.59 | 24-25 | 31-35 | 16.3-19 | 2-2.7 | 3-4 | Accidental | 0.3-0.7 | 14-15 | Accidental | 1-2 | 1-2 |
| 8.44 | 23.7-24 | 33-36 | 16-18 | 1.5-2.5 | 3-3.6 | 0.5-1.0 | Accidental | 15-16 | Accidental | 1-1.7 | 1-2 |
| 10.57 | 22.5-23 | 36.7-38 | 15-16 | 1.5-2 | 3-3.1 | 0.8-1.2 | 0.2-0.3 | 15-16.5 | 0.1-0.2 | 0.7-1 | 1-2.2 |
| 13.35 | 21-22 | 38-41.2 | 13-15 | 1-2 | 2.8-3 | 1.2-2.8 | 16-17.5 | 0.1-0.2 | 0.5-1 | 1-2 |
By table 2 as seen, different FeO content have different technical indicators, and a net effect must be arranged, and need to estimate specially.
By table 3 as seen, FeO content ferrate more is few more, is unfavorable for blast-furnace smelting, and FeO is high more, and then uhligite is many more, and sinter strength is played destruction.
2, optimum FeO content overall evaluation system
Because it is a plurality of that the agglomerate product performance index has, and can not just conclude that preferably the FeO of this group is best with some indexs, must carry out comprehensive evaluation, the existing composite index law of generally using both at home and abroad that adopts.For a plurality of indexs of a system, the index that has is high more good more, is called high excellent index, for example ISO rotary drum, utilization coefficient etc.; The index that has is low more good more, is called low excellent index, for example this case solid burnup, low temperature reduction degradation index etc.The single index number p of high excellent index discusses calculation, i.e. p=X/M with measured value X and standard value M; The single index number p of low excellent index, available standards value M and measured value X discuss calculation, i.e. p=M/X.Standard value is exactly the performance index optimum values.Aggregative index I has several method of calculation: 1. I=p
1+ p
2+ ... + p
n, i.e. single index number addition.2. I=p
1-p
2-...-p
n, promptly single index number multiplies each other.3. I=w
1p
1+ w
2p
2+ ... + w
np
n, promptly single index number multiply by addition again behind the weights, and weights are determined by expertise.
With the aggregative index I of FeO content correspondence in top three kinds of methods difference reckoner 2, tumbler index, utilization coefficient, solid burnup, low temperature reduction degradation index, reduction degree, the third method weight allocation is 0.30: 0.20: 0.15: 0.20: 0.15.Aggregative index is high more, and effect is good more, and evaluation result sees Table 4.
The index comprehensive evaluation result of the different FeO content of table 4 correspondence
As shown in Table 4, the FeO content of agglomerate is that the 6.5-9.5% net effect is better, and especially working as FeO content is 7.24% and 8.44% the best, promptly when FeO content 7.0-8.5% net effect the best, can take into account various indexs at optimum range.FeO content continue to raise, and comprehensive evaluation index descends, so vanadium titanium sintering mine FeO upper content limit can not improve after being controlled at 9.5% again.The third method may draw different aggregative indexes for the weight of different investigator's selections is different, but does not influence the conclusion of the good and bad ordering of FeO content.Through evaluation calculation (mathematics test repeatedly), no matter how weights follow the example of, under same rule condition, all do not influence putting in order of FeO content quality, just comprehensive evaluation index changes, and what FeO content aggregative index was the highest remains 7.24% and 8.44%, and promptly control center is that 7.0-8.5% can make and reaches optimum, this FeO content belongs to advanced low FeO content at present at home, holds firm vanadium titanium sintering mine FeO content up to more than 14% and have now.Strict aborning this FeO content range correspondence of control join the charcoal scope, produce the high-titanium type sinter of low FeO content.
Claims (10)
1. the preparation method of high titan type low FeO content sinter comprises the steps: A, batching, B, mixing, C, cloth, D, igniting, sintering, E, heat fragmentation, F, heat screening, G, cooling, H, screening.It is characterized in that: the sintering main raw material is a high-Ti type V-Ti magnetite concentrate, and its component content contains by weight: TFe 52-55%, FeO29-32%, SiO
23-4%, CaO 1.5-2.0%, MgO 2.0-2.5%, Al
2O
33.0-4.5%, V
2O
50.5-0.6%, TiO
213-15%, S 0.4-0.6%; Mixed carbon comtent was 2.6-3.2% when wherein, steps A was prepared burden.
2. the preparation method of high titan type low FeO content sinter according to claim 1, it is characterized in that: described steps A mixed carbon comtent is 2.8-3.0%.
3. the preparation method of high titan type low FeO content sinter according to claim 1 is characterized in that: the automatic blending technology is adopted in the precision control of fuel ratio, promptly by computer control feed disk and electronic belt scale.
4. the preparation method of high titan type low FeO content sinter according to claim 1 is characterized in that: during step B batching, its raw materials for sintering is made up of following components in weight percentage:
V-ti magnetite concentrate 50-58%, Australian fine ore 8-14%, domestic higher-grade fine ore 10-15%, domestic middle grade fine ore 2-6%, Wingdale 4-8%, unslaked lime 7%, coke powder 3-7% or hard coal 4-8%; Join the 30-50% that returns mine during batching outward.
5. the preparation method of high titan type low FeO content sinter according to claim 4 is characterized in that: described raw materials for sintering is that following components in weight percentage is formed:
V-ti magnetite concentrate 55%, Australian fine ore 10%, domestic higher-grade fine ore 12%, domestic middle grade fine ore 3%, Wingdale 6%, unslaked lime 7%, coke powder 3-7% or hard coal 4-8%; Join outward and return mine 35%.
6. the preparation method of high titan type low FeO content sinter according to claim 1 is characterized in that: the moisture content of mixing the back compound is 7.20 ± 0.20%.
7. the preparation method of high titan type low FeO content sinter according to claim 1, it is characterized in that: bed depth is 500-680mm during step D cloth.
8. the preparation method of high titan type low FeO content sinter according to claim 1 is characterized in that: the igniting negative pressure of step e igniting is 400 * 9.8Pa, and combustion chamber draft is 0-20Pa, and be 2min ignition time, and ignition temperature is 1100 ± 30 ℃.
9. the preparation method of high titan type low FeO content sinter according to claim 1, it is characterized in that: the sintering condition of step e is as follows: sintering negative pressure 12000-13500Pa, be responsible for 100-115 ℃ of spent air temperture, sintering temperature is 1100-1450 ℃.
Each described preparation method preparation of claim 1-9 and high titan type low FeO content sinter, it is characterized in that: the FeO content of agglomerate is 6.5-9.5%.
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| CN104911339A (en) * | 2015-04-24 | 2015-09-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium titanium sinter and preparation method thereof |
| CN105886754A (en) * | 2016-04-12 | 2016-08-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for acidic vanadium-titanium sintered ores |
| CN105886754B (en) * | 2016-04-12 | 2017-09-29 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method of acid vanadium-titanium magnitite sinter |
| CN106885750A (en) * | 2017-02-24 | 2017-06-23 | 武汉科技大学 | A kind of sintering deposit ferrous oxide content detecting system and its method |
| CN108520164A (en) * | 2018-03-16 | 2018-09-11 | 东北大学 | A kind of microwave heating improves the analysis method of vanadium titano-magnetite grindability |
| CN108520164B (en) * | 2018-03-16 | 2020-07-24 | 东北大学 | Analysis method for improving grindability of vanadium titano-magnetite through microwave heating |
| CN110499419A (en) * | 2019-08-30 | 2019-11-26 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of sintering method using ultra-fine grade vanadium ilmenite concentrate |
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