CN103994997B - A kind of method for detecting blast furnace with iron-bearing material reflow conductor roll - Google Patents
A kind of method for detecting blast furnace with iron-bearing material reflow conductor roll Download PDFInfo
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- CN103994997B CN103994997B CN201410207199.5A CN201410207199A CN103994997B CN 103994997 B CN103994997 B CN 103994997B CN 201410207199 A CN201410207199 A CN 201410207199A CN 103994997 B CN103994997 B CN 103994997B
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Abstract
The invention discloses a kind of method for detecting blast furnace with iron-bearing material reflow conductor roll, belong to iron-smelting raw material performance detection technical field, iron ore after prereduction and sample preparation is placed in the high-temperature metallography heating furnace of high-temperature laser confocal microscope and heated by this method, pass through the state change of Real Time Observation iron ore sample at high temperature, can be directly perceived, accurately analysis obtains the softening start temperature of iron ore, soften finishing temperature and first slag flows freely temperature, so as to obtain iron ore more comprehensive metallurgical performance data in blast furnace evolution process, important evidence is provided to improve material quality and stablizing blast fumance.
Description
Technical field
The invention belongs to iron-smelting raw material performance detection technical field, more particularly to a kind of detection blast furnace is soft with iron-bearing material
The method of fusibleness energy.
Background technology
Raw material softens and melted in the cohesive zone of blast furnace, and coal gas can only upwards be moved by coke in cohesive zone,
So cohesive zone directly affects the gas permeability of blast furnace, while the location and shape of cohesive zone formation decide lumpy zone in blast furnace again
The distribution of coal gas, so as to affect gas utilization rate, it can be seen that cohesive zone has highly important influence on blast furnace process.So
And, soft heat belt shape and position in blast furnace, in principle depending on blast furnace operating condition and the high temperature metallurgical properties of raw material.Therefore,
Many scholars conduct extensive research to the reflow conductor roll of iron ore.
In recent years, it is many to be analyzed using Molten drop test when studying the reflow conductor roll of furnace charge.In Molten drop test, pass through
To in sample temperature-rise period, the continuous record of pressure difference in temperature, bed depth and the bed of material, and utilize the fixation shrinkage factor of sample
Temperature represents softening start temperature, the softening finishing temperature of sample, and the temperature skyrocketed with air-flow differential starts to represent melting
Temperature, the temperature mutually dripped with the first dropping liquid represents drippage temperature, finally utilizes smelting of the obtained above index to furnace charge
Refining performance is evaluated.Although these indexs cover all processes of the iron ore from solid-state to liquid, but have many deficiencies
Place.First, the limitation based on experiment condition, can not carry out Real Time Observation to sample in experimentation, be only capable of shrinking the bed of material
10% and 40% temperature is defined as softening start temperature and softens finishing temperature, and calculates with this supposition softening temperature area
Between, this is obviously not accurate enough；Secondly, the melting temperature of the iron ore after reduction should be an interval, due to the iron after reduction
Ore is made up of the iron phase after slag phase and reduction, and melting start temperature should be the relatively low thing of fusing point in slag phase and mutually start fusing
Temperature, and the temperature that skyrockets of air-flow differential should be regarded as the temperature that liquid phase largely flows out, but the limitation based on experiment condition,
Can only be using this temperature come instead of melting start temperature, this is not accurate enough；Moreover, Molten drop test can not be reduced to single ore deposit
The first slag formed afterwards flows freely ability and evaluated.
The content of the invention
It is an object of the invention to provide a kind of method that can intuitively, accurately detect blast furnace iron-bearing material reflow conductor roll,
To obtain the high temperature metallurgical properties data of blast furnace iron-bearing material.
In order to solve the above technical problems, the invention provides a kind of method for detecting blast furnace with iron-bearing material reflow conductor roll,
Contraction and melting behavior using high-temperature laser confocal microscope to the ore after reduction in whole temperature-rise period are continuously seen
Examine, so as to obtain the high temperature metallurgical properties of iron ore, its processing step includes：
(1) iron ore is subjected to prereduction；
(2) iron ore reduced is crushed into powdering；
(3) cylindrical sample is made in powdery iron ore；
(4) cylindrical sample is put into the crucible equipped with platinum pad, it is confocal aobvious that crucible then is put into high-temperature laser
In the high-temperature metallography heating furnace of micro mirror；
(5) sample in crucible is heated by the temperature-rise period designed, it is real to sample using computer and imaging system
When observe, and synchronous acquisition experimentation video；
(6) the experimentation video of collection is analyzed, obtains sample softening start temperature, softening end temp and slag
Iron separation temperature.
Further, the temperature increasing schedule designed is to be warming up to 1400 DEG C, constant temperature with 2.5 DEG C/s programming rate
After 1min, normal temperature is cooled to 1 DEG C/s cooling rate.
Further, in the temperature-rise period, by sample from transfixion to starting to temperature during sample central reduction
Degree is defined as softening start temperature.
Further, in the temperature-rise period, temperature when sample is no longer shunk is defined as softening end temp.
Further, in the temperature-rise period, temperature during transparency liquid outflow is defined as first slag on sample free
Flowing temperature.
The method for the detection blast furnace iron-bearing material reflow conductor roll that the present invention is provided, by the iron ore after prereduction and sample preparation
It is placed in the high-temperature metallography heating furnace of high-temperature laser confocal microscope and heats, by Real Time Observation iron ore sample at high temperature
State change, can obtain the softening start temperature, softening finishing temperature and first slag free flow of iron ore with intuitive and accurate analysis
Dynamic temperature, so that iron ore more comprehensive metallurgical performance data in blast furnace evolution process are obtained, to improve material quality
Important evidence is provided with blast fumance is stablized.
Brief description of the drawings
Fig. 1 is the flow chart of the method for detection blast furnace iron-bearing material reflow conductor roll provided in an embodiment of the present invention.
Fig. 2 illustrates for temperature increasing schedule in the method for detection blast furnace iron-bearing material reflow conductor roll provided in an embodiment of the present invention
Figure.
Fig. 3 does not start to receive for sample in the method for detection blast furnace iron-bearing material reflow conductor roll provided in an embodiment of the present invention
The schematic diagram of contracting.
Fig. 4 is started to shrink at for detection blast furnace provided in an embodiment of the present invention with sample in the method for iron-bearing material reflow conductor roll
Schematic diagram.
Fig. 5 is sample formation first slag in the method for detection blast furnace iron-bearing material reflow conductor roll provided in an embodiment of the present invention
The schematic diagram not flowed out.
Fig. 6 is sample formation first slag in the method for detection blast furnace iron-bearing material reflow conductor roll provided in an embodiment of the present invention
The schematic diagram of outflow.
Fig. 7 is shunk for detection blast furnace provided in an embodiment of the present invention with sample in the method for iron-bearing material reflow conductor roll not to be tied
The schematic diagram of beam.
Fig. 8 is sample pinned sheepshank beam in the method for detection blast furnace iron-bearing material reflow conductor roll provided in an embodiment of the present invention
Schematic diagram.
Embodiment
Referring to Fig. 1, a kind of method for detecting blast furnace with iron-bearing material reflow conductor roll provided in an embodiment of the present invention, including iron
The processing step such as prereduction of iron ore, sample preparation, shaping, dress sample, experiment and data acquisition and data analysis, concrete operation step is such as
Under：
1st, iron ore prereduction.Prereduction is carried out according to the regulation of GB GB/T13241-91 to iron ore, it is sharp after experiment
Atmosphere protection is carried out to high temperature sample with nitrogen until dropping to room temperature, prevents that sample from reoxidizing.
2nd, sample preparation.The iron ore reduced is crushed, the powdery samples of 50-200 mesh are broken into.
3rd, it is molded.Φ 1.5mm × 1.5mm is made in sample by the sample making apparatus and method for making sample standardized using high-temperature laser
Cylindrical sample.
4th, sample is filled.The cylindrical sample being made is put into the Al of Φ 8mm × 4mm equipped with platinum pad2O3In crucible, and
By Al2O3Crucible is put into the high-temperature metallography heating furnace of high-temperature laser confocal microscope.
5th, experiment and data acquisition.Under argon gas atmosphere protection, referring to Fig. 2, it is warming up to 2.5 DEG C/s programming rate
1400 DEG C, after constant temperature 1min, normal temperature is cooled to 1 DEG C/s cooling rate, computer and imaging system Real Time Observation, note is utilized
Sample is recorded with the elevated situation of change of temperature, and synchronous acquisition experimentation video data, finally experimental data is stored.
6th, data analysis.Data to collection are analyzed, to obtain softening start temperature, the softening end temp of sample
With slag sluicing system temperature.
Referring to Fig. 3 and Fig. 4, to judge that furnace charge starts the schematic diagram of softening temperature.Wherein Fig. 3 is in the case where temperature is 945 DEG C
Shoot, Fig. 4 is shot in the case where temperature is 976 DEG C, it can be found that when temperature is 945 DEG C, sample is not started to shrink at from figure；
When reaching 976 DEG C in temperature, sample is started to shrink at, so can determine that the temperature that sample starts softening is 976 DEG C.
Referring to Fig. 5 and Fig. 6, to judge that first slag can flow freely the schematic diagram of temperature in furnace charge.Wherein Fig. 5 is to be in temperature
Shot at 992 DEG C, Fig. 6 is shot in the case where temperature is 1174 DEG C, from figure it can be found that when temperature is 992 DEG C, sample shape
There is not into first slag but transparency liquid to be flowed out from sample；When temperature is 1174 DEG C, begins with transparency liquid and flowed out from sample,
It can be determined that the temperature that the first slag of furnace charge is flowed freely is 1174 DEG C.
Referring to Fig. 7 and Fig. 8, to judge that furnace charge softens the schematic diagram of end temp.Wherein Fig. 7 is in the case where temperature is 1387 DEG C
Shoot, Fig. 8 is shot in the case where temperature is 1396 DEG C, from figure it can be found that when temperature is 1387 DEG C, sample, which shrinks, not to be tied
Beam；When temperature reaches 1396 DEG C, the contraction of sample stops, it is possible to determining that the temperature that sample softening terminates is 1396 DEG C.
During blast furnace ironmaking, softening start temperature is higher, illustrates that soft melt zone original position is lower, lump zone is longer,
Be conducive to improving blast furnace permeability.Soften end temp lower, under conditions of softening start temperature is constant, it is possible to decrease softened zone
Between, improve the gas permeability of blast furnace.And the formation of first slag is the premise of the comprehensive furnace charge metallurgical performance of BF burden optimization improvement, first slag
Flowable can reduce the metallurgical performance gap between different furnace charges, and improve the metallurgical performance of comprehensive furnace charge.So utilizing
The invention, can flow freely temperature to the softening start temperature, softening finishing temperature and first slag of iron-bearing material and accurately be surveyed
Amount, and the difference between the high temperature metallurgical properties of different iron-bearing materials is contrasted, provide important evidence for BF burden optimization.Iron content is former
Material experimental temperature node, which is summarized, is shown in Table 1.
The iron-bearing material experimental temperature node of table 1 is summarized
| Softening starts | Softening ends | Slag phase flows out temperature | Softening is interval | |
| Iron-bearing material | 976 | 1396 | 1174 | 420 |
It should be noted last that, above embodiment is merely illustrative of the technical solution of the present invention and unrestricted,
Although the present invention is described in detail with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent, without departing from the spirit and scope of technical solution of the present invention, it all should cover
Among scope of the presently claimed invention.
Claims (1)
1. a kind of method for detecting blast furnace with iron-bearing material reflow conductor roll, it is characterised in that use high-temperature laser confocal microscope
The contraction of ore after to being reduced in whole temperature-rise period and melting behavior carry out Continuous Observation, so as to obtain the high temperature of iron ore
Metallurgical performance, its processing step includes：
(1) iron ore is subjected to prereduction；
(2) iron ore reduced is crushed into powdering；
(3) cylindrical sample is made in powdery iron ore；
(4) cylindrical sample is put into the crucible equipped with platinum pad, crucible is then put into high-temperature laser confocal microscope
High-temperature metallography heating furnace in；
(5) sample in crucible is heated by the temperature increasing schedule designed, seen using computer and imaging system are real-time to sample
Examine, and synchronous acquisition experimentation video；
(6) the experimentation video of collection is analyzed, it is 976 DEG C, softening end temp to obtain sample softening start temperature
It it is 1174 DEG C for 1396 DEG C, slag sluicing system temperature；
Wherein, described is that iron ore is carried out in advance also according to the regulation of GB GB/T13241-91 by iron ore progress prereduction
Original, carries out atmosphere protection until dropping to room temperature to high temperature sample using nitrogen after experiment, prevents that sample from reoxidizing, the heating system
Degree is to be warming up to 2.5 DEG C/s programming rate after 1400 DEG C, constant temperature 1min, and normal temperature is cooled to 1 DEG C/s cooling rate；Will
Sample is defined as softening start temperature from transfixion to beginning to temperature during sample central reduction, when sample is no longer shunk
Temperature be defined as soften end temp, by sample have temperature during transparency liquid outflow be defined as first slag flow freely temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104597071B (en) * | 2015-02-10 | 2017-07-28 | 攀枝花学院 | Assay method of the carbon-sulfur crucible with respect to softening temperature |
| CN109211631B (en) * | 2018-09-14 | 2020-07-03 | 北京科技大学 | Method for measuring reflow property of iron-containing furnace burden |
| CN109991125B (en) * | 2019-05-16 | 2022-09-23 | 重庆大学 | Method and equipment for testing variable-pressure type reflow dripping performance |
| CN114441371A (en) * | 2021-03-16 | 2022-05-06 | 马继荃 | Material comparison method for material processing |
| CN115165500A (en) * | 2022-07-07 | 2022-10-11 | 福建三钢闽光股份有限公司 | Experimental method for evaluating iron-containing furnace burden interactive reactivity |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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