CN104232883A - Mineral material usage method for increasing usage amount and production rate of sintered iron concentrate - Google Patents
Mineral material usage method for increasing usage amount and production rate of sintered iron concentrate Download PDFInfo
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Abstract
The invention discloses a mineral material usage method for increasing the usage amount and production rate of sintered iron concentrates. The mineral material usage method comprises the following steps: firstly screening a return ore and a fine ore respectively into two parts according to granularities of 1.0-2.0 mm and 4.0-5.0 mm; secondarily, carrying out primary intense agitation mixing granulation and secondary cylinder mixing granulation on low-granularity return ore and fine ore as well as other ingredients such as an iron concentrate, an iron-containing solid waste, a solid fuel and a fusing agent which are used for preparing a sintering mixture, and adding a high-granularity return ore in the process of the secondary cylinder mixing granulation; thirdly, uniformly adding a high-granularity fine ore in the process of conveying the mixture obtained from the secondary cylinder mixing granulation into a mixture bin used for material distribution; and finally adopting a segregational material distribution mode to enable the mixture to generate reasonable size segregation along the height direction of a sintering pallet, and igniting for sintering to form sintered ores. According to the method, the granulating effect of the sintered mixture can be improved, the material layer permeability of a sintering process can be improved, the usage amount of the iron concentrates is increased, the grade of a material charged into a blast furnace is enhanced, and the indexes of a production technology index are optimized.
Description
Technical field
The present invention relates to metallurgical industry sintering art, particularly relate to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity.
Background technology
Agglomerate is the main furnace charge of China's blast furnace ironmaking, accounts for more than 70% of stove iron charge.Due to the in poor quality of sintering main raw material powdered iron ore, the grade of sinter of Steel Plant presents downtrending in recent years, brings disadvantageous effect to thus blast furnace stable smooth operation, is also unfavorable for reducing blast furnace ironmaking cost.
In order to improve grade of sinter, part producing factory starts to allocate high-grade iron ore concentrate into, but after improving the consumption of iron ore concentrate, productivity of sinter decreases, and thus the proportioning of iron ore concentrate is lower in SINTERING PRODUCTION all the time, generally all below 15%.But in sintering production process, the factor of restriction productivity of sinter is a lot, and wherein most crucial bottleneck is the ventilation property of sinter bed, being boosted productivity by the ventilation property improving sinter bed is the developing direction of sintering technology.
The Iron And Steel Companies such as Nippon Steel once to adopt in sinter bed the measure such as mounting bracket or ventilation rods to improve bed permeability, but made cost of investment increase like this, and iron ore concentrate usage quantity is still limited.Northeastern Japan university proposes inserted agglomeration for iron mine technology, namely in sinter bed, green pellets is inserted, density regions is formed by " wall effect " around it, suppress sinter bed to shrink by fine and close green pellets to the supporting role on top, thus in sinter bed, form suitable ventilation path, improve permeability of sintering material bed, but it needs to use the good iron ore concentrate of balling property or fine ore, and need to increase pelletizing facility, construction cost and production cost high, be difficult to promote.
Chinese patent CN101294243B discloses a kind of Pelletisation process for iron ore concentrate sintered mix, secondary method of granulating is adopted to granulate, make bead after first part Iron concentrate and unslaked lime being mixed, then mix with flux, coke powder and all the other iron-bearing materials, carry out secondary granulation.Permeability of sintering material bed and productivity of sinter is improved with this.Chinese patent CN101570821B discloses a kind of sintering method of high mixture ratio spiegel concentrate, first after particulate spiegel concentrate being carried out Pretreatment by high pressure roller grinding, mix with the organic binder bond of certain mass, adopt disk or drum pelletizer to make the green-ball that particle diameter is 7mm-15mm.Again other iron-bearing materials, flux, coke powder etc. are carried out mixing, pelletization treatment, then carry out lighting a fire, sintering.
But the raising iron ore concentrate consumption described in above-mentioned patent and the method for productivity of sinter, also all need to increase pre-processing device and pelletizing facility, and specific aim is comparatively strong, the scope of application is narrower.
Summary of the invention
For overcoming above-mentioned shortcoming, the object of the invention is to: a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity is provided, according to method of the present invention, the granulating efficiency of sinter mixture can be improved, improve the bed permeability of sintering process, improve iron ore concentrate consumption and blast furnace feeding furnace charge grade, optimization production technical indicator.
For achieving the above object, a kind of technical scheme improving the mineral aggregate using method of sintered iron concentrate consumption and productivity of the present invention is as follows:
A kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity, use is returned mine and fine ore, described return mine comprise break of sinter cake screening after be less than in 5.0mm and return mine and BF return fines, namely blast furnace returns the mixture of agglomerated powder, described fine ore is the mixture of one or more powdered iron ore, comprises the steps:
(1) first will return mine and fine ore be sieved into two portions by grade 1.0-2.0mm and 4.0-5.0mm respectively;
(2) grade is less than respectively returning mine and fine ore of 1.0-2.0mm and 4.0-5.0mm, carry out a strong stirring with other batchings for the preparation of sinter mixture such as iron ore concentrate, iron content solid waste, solid fuel and flux to mix and secondary cylinder mixing granulation, add in the process of carrying out secondary cylinder mixing granulation and sieve the grade obtained and be greater than returning mine of 1.0-2.0mm;
(3) be transported to blending bun at the compound obtained by secondary cylinder mixing granulation to be used in the process of cloth, evenly adding the fine ore sieving the grade obtained and be greater than 4.0 ~ 5.0mm;
(4) adopt segregation distribution mode to make compound produce rational particle segregation along pallet short transverse, that is, make large grade fine ore and compound be positioned at chassis bottom as much as possible, to improve bed permeability, then after igniting sintering, form agglomerate.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, by the break of sinter cake screening obtained, the grade being greater than 5.0mm is as finished product agglomerate, and the grade being less than 5.0mm is returned mine as interior.
According to the present invention, the TFe content of described sintered iron concentrate is greater than 62%, wherein, is less than 0.074mm grain size content and is greater than 60% ".To return mine in described returning mine for sintering plant inside.
TFe is full iron.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, by the break of sinter cake screening obtained, the grade being greater than 5.0mm is as finished product agglomerate, and the grade being less than 5.0mm is returned mine as interior
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, described fine ore is the mixture of one or more powdered iron ore, and mean particle size is greater than 2mm, is less than 5mm.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, described returning mine is returned mine and the mixture of BF return fines (blast furnace returns agglomerated powder) for being less than in 5.0mm after break of sinter cake screening, moisture content is less than 1%(mass percent, lower same).
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, the TFe content of described iron ore concentrate is greater than 65% ,-0.074mm grain size content and is greater than 60%.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, described solid fuel is one or more mixtures in coke powder, coal dust, biomass fuel.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, the proportioning of described compound is: fine ore 30%-60%, iron ore concentrate 5%-35%, return mine 15%-25%, iron content solid waste 0%-2%, solid fuel 3%-4%, flux 8%-12%.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, the principle that adds water of described processes of mixing and granulating is: the mixture moisture being kept for cloth sintering is 6.8%-7.3%, moisture does not only add to be greater than before 1.0-2.0mm returns mine in a strong stirring mixing and secondary cylinder mixing granulation and adds, and accounts for 80-85% and 15-20% of (a strong stirring mixing and secondary cylinder mixing granulation) total amount of water respectively.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, a described strong stirring mixing time is 1.0-2.0min, and the secondary cylinder mixing granulation time is 3.0-4.5min.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, described in be greater than returning mine of 1.0-2.0mm be add after secondary cylinder mixing granulation time only surplus 0.2-0.5min.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, it is characterized in that, described segregation distribution mode is magnetic roller+nine roller or magnetic roller+reflector type cloth, and the permanent magnet that magnetic roller is changed by the distribute roll in round roller feeding machine and the alternating polarity that arranges in distribute roll is formed (nine rollers and reflector are conventional apparatus for distributing).
According to the present invention, described segregation distribution mode is magnetic roller+nine roller or magnetic roller+reflector type cloth, it utilizes and makes large grade fine ore and the size fractionated compound being stained with concentrate particle change fall trajectory because the magnetic force that is subject to is different with the feed round roller of magnetic force systems, and strengthen segregation further by nine rollers or reflector, thus make large grade fine ore and compound is as much as possible is positioned at chassis bottom, reach the object improving bed permeability and iron ore concentrate consumption.
Screening fine ore and the innovation theory basis adopting strong stirring to mix are: research shows that the particle of <0.7mm in mixture granulation process is adhered particles, the particle of 0.7-4mm is effective Nucleating particles, although be greater than 4mm particle easily to bond fine powder, but because particle own is large, specific surface area is little, bonding is loosely easily broken into pieces, and small-particle can be disturbed to granulate.The particle grade being conducive to most ventilation property after granulation in compound is 3-8mm, especially 3-5mm grade.By screening fine ore and the mixing of employing strong stirring; not only avoid large granular materials interference to granulate; too increase the nodulizer meeting of small particles material; the hydrophilic additive of improvement compound (as slaked lime, unslaked lime etc.) can also be made to be dispersed in material surface uniformly; substantially increase the pellet performance of compound, thus significantly improve the granulating efficiency of compound and the ventilation property of sinter bed.
Sieving the innovation theory basis of returning mine is: in the mixing bed of material, add larger drying uniformly to return mine particle, utilize dry frictional force of returning mine between particle and moistening mixture particle, make to form density regions around it, suppress sinter bed to shrink by densification particle of returning mine to the supporting role on top, thus in sinter bed, form suitable ventilation path.The mixture moisture that this external cause is kept for cloth sintering is constant, material water branch before adding large grade and returning mine is greater than final mixture moisture, more moisture content makes the material pelletization effect entering a strong stirring mixing and secondary cylinder mixing granulation be improved, and is also conducive to improving bed permeability.
In above-mentioned preparation process, sinter mixture igniting and sintering process are routine techniques, do not repeat them here.
The present invention compared with prior art has following beneficial effect:
(1) fine ore is become two grades with prescreening of returning mine by the present invention, small-particle part and the first mixing granulation of other material, and moisture mainly adds in this stage, certainly will increase the chance that small-particle is granulated like this, improve granulating efficiency;
(2) the present invention adopts strong stirring to mix, and can improve mixture homogeneity, makes flux and solid fuel obtain splendid dispersion, can improve granulating efficiency and also can reduce fuel consumption;
(3) significantly can increase the iron ore concentrate consumption of sintering, improve blast furnace feeding agglomerate Iron grade, reduce molten iron smelting cost;
(4) to return mine after being mixed into dry screening uniformly in compound particle, utilize the rubbing effect between dry particle and wet granular to improve permeability of sintering material bed, improve productivity of sinter.
Accompanying drawing explanation
Fig. 1 is technical solution of the present invention schematic diagram.
Embodiment
Below, with reference to embodiment, the present invention is illustrated.
Embodiment 1
See Fig. 1, the method for raising sintered iron concentrate consumption of the present invention and productivity, first will return mine and fine ore is sieved into two portions by grade 1.0-2.0mm and 4.0-5.0mm respectively.Second, grade is less than respectively returning mine and fine ore of 1.0-2.0mm and 4.0-5.0mm, carry out a strong stirring with other batchings preparing sinter mixture such as iron ore concentrate, iron content solid waste, solid fuel and flux to mix and secondary cylinder mixing granulation, add in the process of carrying out secondary cylinder mixing granulation and sieve the grade obtained and be greater than returning mine of 1.0-2.0mm.3rd, be transported to blending bun at the compound obtained by secondary cylinder mixing granulation and be used in the process of cloth, evenly adding the fine ore sieving the grade obtained and be greater than 4.0 ~ 5.0mm.Finally adopt the mode of segregation distribution to make compound produce rational particle segregation along pallet short transverse, even if large grade fine ore and compound is as much as possible is positioned at chassis bottom, improve bed permeability, then after igniting sintering, form agglomerate.And the break of sinter cake screening that will obtain, the grade being greater than 5.0mm is as finished product agglomerate, and the grade being less than 5.0mm is returned mine as interior, returning mine as sintering together with BF return fines of inside returning mine.
Below in conjunction with embodiment, the present invention will be further described.
The optimum configurations of embodiment is as shown in table 1:
Table 1 embodiment optimum configurations
Table 2 result of implementation
According to the result of implementation of embodiment parameter listed by table 1 in table 2.Adopt the scheme of embodiment 1, compared with reference examples, its granulation median size improves 26.5%, and yield rate improves 1.6%, and utilization coefficient improves 9.1%, and tumbler index improves 2.1%, and solid burnup reduces by 3.6%.Adopt the scheme of embodiment 3, compared with reference examples, its granulation median size improves 11.8%, and yield rate improves 0.6%, and utilization coefficient is suitable with tumbler index, and solid burnup reduces by 2.4%.Agglomerate TFe content improves 3.4%.
According to a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity of the present invention, the granulating efficiency of sinter mixture can be improved, improve the bed permeability of sintering process, improve iron ore concentrate consumption and blast furnace feeding furnace charge grade, optimization production technical indicator.
Claims (10)
1. one kind is improved the mineral aggregate using method of sintered iron concentrate consumption and productivity, use is returned mine and fine ore, described return mine comprise break of sinter cake screening after be less than in 5.0mm and return mine and BF return fines, namely blast furnace returns the mixture of agglomerated powder, described fine ore is the mixture of one or more powdered iron ore, comprises the steps:
(1) first will return mine and fine ore be sieved into two portions by grade 1.0-2.0mm and 4.0-5.0mm respectively;
(2) grade is less than respectively returning mine and fine ore of 1.0-2.0mm and 4.0-5.0mm, carry out a strong stirring with other batchings for the preparation of sinter mixture such as iron ore concentrate, iron content solid waste, solid fuel and flux to mix and secondary cylinder mixing granulation, add in the process of carrying out secondary cylinder mixing granulation and sieve the grade obtained and be greater than returning mine of 1.0-2.0mm;
(3) be transported to blending bun at the compound obtained by secondary cylinder mixing granulation to be used in the process of cloth, evenly adding the fine ore sieving the grade obtained and be greater than 4.0 ~ 5.0mm;
(4) adopt segregation distribution mode to make compound produce rational particle segregation along pallet short transverse, that is, make large grade fine ore and compound be positioned at chassis bottom as much as possible, to improve bed permeability, then after igniting sintering, form agglomerate.
2. a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity as claimed in claim 1, it is characterized in that, described fine ore is the mixture of one or more powdered iron ore, and mean particle size is greater than 2mm, is less than 5mm.
3. a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity as claimed in claim 1, is characterized in that, described in return mine and to return mine and the mixture of BF return fines for being less than in 5.0mm after break of sinter cake screening, moisture content is less than 1 quality %.
4. a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity as claimed in claim 1, it is characterized in that, the TFe content of described iron ore concentrate is greater than 62 quality %, is less than 0.074mm grain size content and is greater than 60 quality %.
5. a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity as claimed in claim 1, it is characterized in that, described solid fuel is one or more mixtures in coke powder, coal dust, biomass fuel.
6. a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity as claimed in claim 1, it is characterized in that, the quality proportioning of described compound is: fine ore 30%-60%, iron ore concentrate 5%-35%, return mine 15%-25%, iron content solid waste 0%-2%, solid fuel 3%-4%, flux 8%-12%.
7. a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity as claimed in claim 1, it is characterized in that, the principle that adds water of described processes of mixing and granulating is: the mixture moisture being kept for cloth sintering is 6.8%-7.3%(quality), moisture does not only add to be greater than before 1.0-2.0mm returns mine in a strong stirring mixing and secondary cylinder mixing granulation and adds, and accounts for 80-85% and 15-20% of a strong stirring mixing and the total amount of water of secondary cylinder mixing granulation respectively.
8. a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity as claimed in claim 1, it is characterized in that, a described strong stirring mixing time is 1.0-2.0min, and the secondary cylinder mixing granulation time is 3.0-4.5min.
9. a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity as claimed in claim 1, is characterized in that, described in be greater than returning mine of 1.0-2.0mm be add after secondary cylinder mixing granulation time only surplus 0.2-0.5min.
10. a kind of mineral aggregate using method improving sintered iron concentrate consumption and productivity as claimed in claim 1, it is characterized in that, described segregation distribution mode is magnetic roller+nine roller or magnetic roller+reflector type cloth.
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| CN111560516A (en) * | 2020-06-08 | 2020-08-21 | 南开大学 | Sintering mixture and mixing method, sintered ore and sintering method |
| CN114251948A (en) * | 2020-09-22 | 2022-03-29 | 中冶长天国际工程有限责任公司 | Sintering fuel segregation distributing device and method |
| CN113249568A (en) * | 2021-04-15 | 2021-08-13 | 首钢集团有限公司 | Sintering raw material and preparation method thereof |
| CN113249568B (en) * | 2021-04-15 | 2022-10-21 | 首钢集团有限公司 | Sintering raw material and preparation method thereof |
| CN113789440A (en) * | 2021-09-28 | 2021-12-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of vanadium-titanium pellet ore |
| CN115261615A (en) * | 2022-07-30 | 2022-11-01 | 山东泰山钢铁集团有限公司 | Sintering and batching method for return fines graded layered distribution |
| CN115261615B (en) * | 2022-07-30 | 2024-06-11 | 山东泰山钢铁集团有限公司 | Sintering batching method for return ore grading layering distribution |
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