CN105463188B - A kind of method for determining iron ore powder sintering Liquid phase flowability energy - Google Patents
A kind of method for determining iron ore powder sintering Liquid phase flowability energy Download PDFInfo
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- CN105463188B CN105463188B CN201510850146.XA CN201510850146A CN105463188B CN 105463188 B CN105463188 B CN 105463188B CN 201510850146 A CN201510850146 A CN 201510850146A CN 105463188 B CN105463188 B CN 105463188B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
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Abstract
The present invention relates to blast furnace ironmaking sintering technology field, discloses a kind of method for determining iron ore powder sintering Liquid phase flowability energy, comprises the following steps：First, Iron Ore Powder and CaO reagents are ground into fine powder, dried；2nd, sample is made；3rd, sample is put into high temperature furnace roasting；Time and temperature are recorded while shooting；4th, image and data message are gathered；Determine the beginning and end of sample sintering liquid phase effective flowing；The flow area for measuring sample is carried out, and calculates flowing time, flowing temperature, area growth rate；Further calculate mobility characteristic LD；The present invention considers Iron Ore Powder and generates the influences of the factor to Iron Ore Powder flow process such as flowing temperature, flowing time, area growth rate and heating rate in liquid phase process with Cao reactions, improve the defects of existing method can not characterize liquid phase flowing whole information comprehensively, technological process is simple, technological parameter is stable, it is easy to laboratory test, can be promoted the use of in actual production.
Description
Technical field
The present invention relates to blast furnace ironmaking sintering technology field, more particularly to a kind of measure iron ore powder sintering Liquid phase flowability energy
Method.
Background technology
With Iron and Steel Enterprises in China production capacity surplus, iron and steel enterprise is generally in lossing state, and domestic blast furnace ironmaking enterprise is
Seek to survive, rationally extricated oneself from a predicament efficiently using Iron Ore Powder improving the cost performance of sintering deposit to enterprise necessary.
The characteristics of low-quality iron ore deposit is that composition and performance inconsistency are larger, and some sintering characters deficiency, but in sintering
Usage amount is little；By the reasonably combined of variety classes Iron Ore Powder, it can not only improve iron ore integrated metallurgical to a certain extent
Performance, ensure that the economic and technical norms of blast fumance are stable, can also reach the purpose for reducing ironmaking cost.Different Iron Ore Powders
It is reasonably combined, some basic parameters need to be obtained by sintering cup test, in order to more accurately simulate sintering production process, sintering
Cup volume tends to maximize so that its workload increases, and the test period is elongated.By the research of iron ore powder sintering basic characteristic,
The information and data of Iron Ore Powder basic property are obtained, can both optimize sintering cup test, operating efficiency is improved, can tackle low again
Know sintered material during the frequent change of matter mineral.
Wherein, iron ore powder in sintering process generates the fluid ability of liquid phase, the i.e. mobile performance of Iron Ore Powder with CaO reactions extremely
Close important；Sintering liquid phase self-characteristic and its fluid ability are to influence sintering consolidation quality, or even Metallurgical Properties of Sinter is good and bad
An important factor for.
The method for measuring Iron Ore Powder flowing is a lot, one is document《Fluidity of liquid phase in iron ores during sintering》(Wu Shengli, Du
Jian Xindeng University of Science ＆ Technology, Beijing journal, 2005,27 (3):291) slamp value (area growth rate) is proposed in；The second is
Researcher thinks that temperature and time is to influence the vital factor of Iron Ore Powder mobility, the characteristic melting temperature of proposition, fusing
The evaluation indexes such as time；The third is carrying out home position observation to liquid phase with high temperature confocal microscope, the flowing velocity of proposition can be right
Liquid phase one party, which flows up, makes dynamic characterization.
Had the following disadvantages in the above method and inconvenient：Temperature factor is considered, temperature convection is not provided quantitatively but and moves
The influence of property；Temperature range is have selected, but can not reasonably combine flowing and the rule shunk；Flowing velocity is proposed, but not
Overall flow state can be characterized；Evaluation index is various, needs repeatedly value, and internal relation considers deficiency between index, it is impossible to complete
Face characterizes liquid phase flowing whole information, thereby results in that evaluation index is inconvenient for use, and be unable to the mobility of exact representation Iron Ore Powder
Energy.
The content of the invention
The purpose of the present invention is exactly overcome the deficiencies in the prior art, there is provided one kind measure iron ore powder sintering Liquid phase flowability
The method of energy, specifically includes following steps：
Step 1: Iron Ore Powder and analysis are ground into granularity with pure CaO reagents<149 μm of fine-powdered, dry；
Step 2: Iron Ore Powder and CaO mixed mineral powder sample and Iron Ore Powder pad sample are made, on tablet press machine respectively
It is pressed into mixed mineral powder cylinder sample and Iron Ore Powder pad sample；
Step 3: the mixed mineral powder cylinder sample is placed on the Iron Ore Powder pad sample, it is put into high temperature furnace
It is calcined；Time and temperature are recorded while shooting to sample in temperature-rise period；
Step 4: image and data message are gathered in temperature-rise period by computer system；Determine the mixed mineral powder examination
Sample sinters the beginning and end of liquid phase effective flowing；Using the flow area of Photoshop pixels method measurement sample, by starting point and
Time point, temperature and flow area corresponding to terminal, flowing time, flowing temperature, area growth rate is calculated；Further
Calculate mobility characteristic LD：
In formula：LD is mobility characteristic；For flow parameter；
It is temperature to speed correction factor；υzTo sinter liquid phase itself flowing velocity, i.e.,
The ratio between liquid phase flow area growth rate and flowing time Δ S/t, 1/s；Δ S is area growth rate, that is, flows origin-to-destination liquid
Phase flow area growth rate, %；T is flowing time, s；T is flowing temperature, that is, flows Origin And Destination temperature averages, K；TMark
For actual sintered temperature, K；H is heating rate, K/s.
Further, the basicity of mixed mineral powder described in step 2 is 3.0-5.0.
Further, the basicity of the mixed mineral powder is 4.0.
Further, the size of mixed mineral powder cylinder sample described in step 2 is diameter 8mm, a height of 5-6mm, composite ore
The quality of powder cylinder sample is 0.6-1.0g；The Iron Ore Powder pad specimen size is diameter 24mm, high 4mm, Iron Ore Powder pad
The quality of sample is 3g.
Further, the temperature-rise period being calcined in step 3 is：Room temperature is heated up to 600 DEG C with 15 DEG C/min, and 600~1150
DEG C with 10 DEG C/min heat up, more than 1150 DEG C with 5 DEG C/min heating；Meanwhile in room temperature to logical nitrogen during 1150 DEG C, ventilation
Measure as 3L/min；Reach 1150 DEG C of blowing airs during off-test, throughput 3L/min in temperature.
Further, area growth rate S=(S in step 4P30-SP75)/SP75；Wherein SP30、SP75To be mixed in sintering process
Close Iron Ore Powder sample liquid phase flow area when miberal powder specimen height declines 70%, 25% respectively；TMarkFor actual sintered temperature
1563K。
Compared to the prior art the present invention has advantageous effect in that：
(1) present invention considers various important informations in Iron Ore Powder and Cao reaction generation liquid phase process, as flowing temperature,
Influence of the factor such as flowing time, area growth rate and heating rate to Iron Ore Powder flow process, improving previous methods can not
The defects of characterizing liquid phase flowing whole information comprehensively, avoids evaluation index inconvenient for use, and be unable to the stream of exact representation Iron Ore Powder
The problem of dynamic performance.
(2) technological process of the invention is simple, and technological parameter is stable, and the visual horizontal-type high temperature stove used can be with synchronous acquisition
Iron Ore Powder and the image information and temporal information of the liquid phase flow process of CaO reaction generations, can take out sample at any time to detect
The flow regime of liquid phase flow process.
(3) anabolic reaction characteristic proposed by the present invention, contains Iron Ore Powder comprehensively and the liquid phase of CaO reaction generations flows
During various information, be easy to be tested in laboratory, can be evaluated as Iron Ore Powder Liquid phase flowability and carry out sintered cup
The foundation of experiment, it is easier to receive and adopt for production technical staff.
Brief description of the drawings
Fig. 1 show Iron Ore Powder sample melt-flow procedure chart.
Fig. 2 show the graph of a relation of Iron Ore Powder specimen height change and temperature.
Fig. 3 show the correction function curve map that temperature convection moves speed.
Embodiment
The specific embodiment of the invention is described in detail below in conjunction with specific accompanying drawing.It should be noted that in following embodiments
The combination of the technical characteristic or technical characteristic of description is not construed as isolated, and they can be mutually combined so as to reach
To superior technique effect.In the accompanying drawing of following embodiments, identical label that each accompanying drawing occurs represent identical feature or
Person's part, it can be applied in different embodiments.
A kind of method for determining iron ore powder sintering Liquid phase flowability energy of the embodiment of the present invention, specifically includes following steps：
Step 1: Iron Ore Powder and analysis are ground into granularity with pure CaO reagents<149 μm of fine-powdered, dry；
Step 2: Iron Ore Powder and CaO mixed mineral powder sample and Iron Ore Powder pad sample are made, on tablet press machine respectively
It is pressed into mixed mineral powder cylinder sample and Iron Ore Powder pad sample；
Step 3: the mixed mineral powder cylinder sample is placed on the Iron Ore Powder pad sample, it is put into high temperature furnace
It is calcined；Time and temperature are recorded while shooting to sample in temperature-rise period；
Step 4: image and data message are gathered in temperature-rise period by computer system；Determine the mixed mineral powder examination
Sample sinters the beginning and end of liquid phase effective flowing；Using the flow area of Photoshop pixels method measurement sample, by starting point and
Time point, temperature and flow area corresponding to terminal, flowing time, flowing temperature, area growth rate is calculated；Further
Calculate mobility characteristic LD：
In formula：LD is mobility characteristic；For flow parameter；
It is temperature to speed correction factor；υzTo sinter liquid phase itself flowing velocity, i.e.,
The ratio between liquid phase flow area growth rate and flowing time Δ S/t, 1/s；Δ S is area growth rate, that is, flows origin-to-destination liquid
Phase flow area growth rate, %；T is flowing time, s；T is flowing temperature, that is, flows Origin And Destination temperature averages, K；TMark
For actual sintered temperature, K；H is heating rate, K/s.
The basicity of mixed mineral powder described in step 2 is 3.0-5.0, preferably 4.0；Mixed mineral powder described in step 2 is justified
The size of post sample is diameter 8mm, a height of 5-6mm, and the quality of mixed mineral powder cylinder sample is 0.6-1.0g, preferably 0.8g；
The Iron Ore Powder pad specimen size is diameter 24mm, high 4mm, and the quality of Iron Ore Powder pad sample is 3g.
The temperature-rise period being calcined in step 3 is：Room temperature to 600 DEG C with 15 DEG C/min heat up, 600~1150 DEG C with 10 DEG C/
Min is heated up, and more than 1150 DEG C are heated up with 5 DEG C/min；Meanwhile in room temperature to logical nitrogen during 1150 DEG C, throughput 3L/
min；Reach 1150 DEG C of blowing airs during off-test, throughput 3L/min in temperature.
Area growth rate S=(S in step 4P30-SP75)/SP75；Wherein SP30、SP75Tried for mixed mineral powder in sintering process
Iron Ore Powder sample liquid phase flow area when sample height declines 70%, 25% respectively；TMarkFor actual sintered temperature 1563K.
In the present embodiment, Iron Ore Powder liquid phase flowing is carried out according to above-mentioned steps for 6 kinds of Iron Ore Powders (A, B, C, D, E and F)
Property testing experiment, 6 kinds of Iron Ore Powder chemical compositions are as shown in table 1：
The chemical composition (mass fraction, %) of the Iron Ore Powder of table 1
1. analysis of experimental results
During experiment, sample form before 1150 DEG C does not change substantially, therefore defines sample and do not become in form
Elemental height during change is 1, then melts the respective heights of Iron Ore Powder sample at different temperatures such as Fig. 1 institutes during flow test
Show；
As temperature raises, the height of sample can change, if height increases, as sample expands, on the contrary then be
Shrink；120% represents 1.2 times that specimen height is changed into elemental height, i.e., sample expands 20%；80% represents specimen height
It is changed into the 80% of elemental height, i.e. sample has shunk 20%.
Sample is with height change curve corresponding to the rise of temperature as shown in Fig. 2 from figure 2 it can be seen that miberal powder exists
High shrinkage undergoes in temperature-rise period：Stage, at a slow speed fast phase, stage at a slow speed.C, tetra- kinds of miberal powder samples of D, E and F are from the beginning of
It is contracted to P75For first stage at a slow speed；From P75To P30For fast phase, shorter temperature section is experienced, but complete master
The constriction wanted；From P30No longer become to sample form and turn to second stage at a slow speed, the stage is slower at a slow speed compared with first.A、B
The difference of two kinds of miberal powders be its first at a slow speed the stage (start to shrink to P90) it is relatively early terminate, as shown in Table 1 both
The S of miberal powderiO2Content is higher by much compared with other miberal powders, and the generation of abundant liquid phase is fast phase (P90To P30) occur in advance can
Can reason.In conjunction with Fig. 1 as can be seen that when specimen height have dropped 25% or so, effective liquid phase has gradually formed, afterwards
Its growing amount gradually increases, and sample is constantly shrinking before 25%, but caused amount of liquid phase is limited, is not enough to flow；
When specimen height have dropped 70% or so, liquid phase is sufficiently formed, and its growing amount will be gradually reduced afterwards, and is finally stopped,
Decline this explains specimen height in Fig. 2 has the reason for different decrease speeds in different phase.Therefore miberal powder is defined in the area
Interior flowing is to sinter the effective flowing section of liquid phase, i.e., it is respectively sintering liquid phase that specimen height, which have dropped at 25% and 70%,
The starting point P of effective flowing75With terminal P30。
2. sinter the characterization result analysis of liquid phase flow process
6 kinds of miberal powders liquid phase flowing starting point P during experiment75With terminal P30Corresponding basic data is as shown in table 2；Table 3
It show sintering liquid phase flowing process data.
Table 2 tests process basis data
Table 3 sinters liquid phase flowing process data
Table 4 is with TMarkStandard is done for 1290 DEG C, the result that experimental data substitution following equation is obtained.
Mobility characteristic：
Flow parameter：It can obtain：
The Iron Ore Powder flow parameter of table 4 and mobility characteristic
As shown in Table 4, result when 6 kinds of miberal powders are characterized with mobility characteristic is LDB>LDA>LDC>LDD>LDF>
LDE, with the result F characterized with flow parameterB>FA>FC>FD>FF>FEOrder be consistent, but the numerical value of two kinds of evaluation indexes
There is large change, its reason is exactly to consider the correcting action that temperature convection moves speed.Correction function is as follows：
Fig. 3 show the function curve that temperature convection moves speed, the flowing temperature of different miberal powders in corresponding table 3, can be in Fig. 3
In obtain its correction value.Miberal powder A and B characterize relatively using flowing because its flowing temperature is relatively low using mobility characteristic
During parameter characterization, original 2~3 times are numerically increased to；D and E miberal powders are special using mobility because its flowing temperature is higher
When sign number characterize relatively using flow parameter sign, numerically it is reduced to original 0.8~0.9 times；And miberal powder C and F make
During with two kinds of characterizing methods, numerical value change is little, and this is reason of its flowing temperature close to sintering production normal temperature.Therefore,
The material impact of temperature is taken into full account, the mobility characteristic after temperature adjustmemt is more objective, really reflects iron ore
The mobile performance difference of powder.
As shown in Table 2, what the area growth rate of 6 kinds of miberal powders was descending is ordered as SA>SB>SC>SD>SF>SE, with using stream
The difference of dynamic property characteristic characterization result is miberal powder A and B, and the larger A miberal powders of area growth rate are spread in flowing, which out, to be needed to come relatively
Say that longer flowing time could flow out, so can not show a candle to miberal powder B when being characterized with mobility characteristic.Due to flowing
Property characteristic has considered the factors such as flowing temperature in flow process, time, therefore it can segment out different Iron Ore Powder streams
The performance difference of dynamic process.
Compared to the prior art the present invention has advantageous effect in that：
(1) present invention considers various important informations in Iron Ore Powder and Cao reaction generation liquid phase process, as flowing temperature,
Influence of the factor such as flowing time, area growth rate and heating rate to Iron Ore Powder flow process, improving previous methods can not
The defects of characterizing liquid phase flowing whole information comprehensively, avoids evaluation index inconvenient for use, and be unable to the stream of exact representation Iron Ore Powder
The problem of dynamic performance.
(2) technological process of the invention is simple, and technological parameter is stable, and the visual horizontal-type high temperature stove used can be with synchronous acquisition
Iron Ore Powder and the image information and temporal information of the liquid phase flow process of CaO reaction generations, can take out sample at any time to detect
The flow regime of liquid phase flow process.
(3) anabolic reaction characteristic proposed by the present invention, contains Iron Ore Powder comprehensively and the liquid phase of CaO reaction generations flows
During various information, be easy to be tested in laboratory, can be evaluated as Iron Ore Powder Liquid phase flowability and carry out sintered cup
The foundation of experiment, it is easier to receive and adopt for production technical staff.
Although having been presented for one embodiment of the present of invention herein, it will be appreciated by those of skill in the art that
Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment be it is exemplary, no
Restriction that should be using the embodiments herein as interest field of the present invention.
Claims (6)
- A kind of 1. method for determining iron ore powder sintering Liquid phase flowability energy, it is characterised in that specifically include following steps：Step 1: Iron Ore Powder and analysis are ground into granularity with pure CaO reagents<149 μm of fine-powdered, dry；Step 2: making Iron Ore Powder and CaO mixed mineral powder sample and Iron Ore Powder pad sample, suppressed respectively on tablet press machine Into mixed mineral powder cylinder sample and Iron Ore Powder pad sample；Step 3: the mixed mineral powder cylinder sample is placed on the Iron Ore Powder pad sample, it is put into high temperature furnace and carries out Roasting；Time and temperature are recorded while shooting to sample in temperature-rise period；Step 4: image and data message are gathered in temperature-rise period by computer system；Determine that the mixed mineral powder sample burns Tie the beginning and end of liquid phase effective flowing；Using the flow area of Photoshop pixels method measurement sample, by beginning and end Corresponding time point, temperature and flow area, flowing time, flowing temperature, area growth rate is calculated；Further calculate Go out mobility characteristic LD：In formula：LD is mobility characteristic；For flow parameter；It is temperature to speed Spend correction factor；υzFor sinter liquid phase itself flowing velocity, i.e. the ratio between liquid phase flow area growth rate and flowing time Δ S/t, 1/s；Δ S is area growth rate, that is, flows origin-to-destination liquid phase flow area growth rate, %；T is flowing time, s；T is stream Dynamic temperature, that is, flow Origin And Destination temperature averages, K；TMarkFor actual sintered temperature, K；H is heating rate, K/s.
- 2. the method for measure iron ore powder sintering Liquid phase flowability energy as claimed in claim 1, it is characterised in that institute in step 2 The basicity for stating mixed mineral powder is 3.0-5.0.
- 3. the method for measure iron ore powder sintering Liquid phase flowability energy as claimed in claim 2, it is characterised in that the composite ore The basicity of powder is 4.0.
- 4. the method for the measure iron ore powder sintering Liquid phase flowability energy as described in claim any one of 1-3, it is characterised in that step The size of mixed mineral powder cylinder sample described in rapid two is diameter 8mm, a height of 5-6mm, and the quality of mixed mineral powder cylinder sample is 0.6-1.0g；The Iron Ore Powder pad specimen size is diameter 24mm, high 4mm, and the quality of Iron Ore Powder pad sample is 3g.
- 5. the method for the measure iron ore powder sintering Liquid phase flowability energy as described in claim any one of 1-3, it is characterised in that step The temperature-rise period being calcined in rapid three is：Room temperature is heated up to 600 DEG C with 15 DEG C/min, and 600~1150 DEG C are heated up with 10 DEG C/min, More than 1150 DEG C are heated up with 5 DEG C/min；Meanwhile in room temperature to logical nitrogen during 1150 DEG C, throughput 3L/min；In temperature Reach 1150 DEG C of blowing airs during off-test, throughput 3L/min.
- 6. the method for measure iron ore powder sintering Liquid phase flowability energy as claimed in claim 1, it is characterised in that face in step 4 Product growth rate Δ S=(SP30-SP75)/SP75；Wherein SP30、SP75Decline respectively for mixed mineral powder specimen height in sintering process 70%th, 25% when mixed mineral powder sample liquid phase flow area；TMarkFor actual sintered temperature 1563K.
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| CN107561115A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | Method for detecting high-temperature reaction characteristic of sintering quicklime |
| CN106769661A (en) * | 2016-11-18 | 2017-05-31 | 内蒙古包钢钢联股份有限公司 | The evaluation method of iron ore powder Liquid phase flowability |
| CN107967625B (en) * | 2017-11-26 | 2021-08-20 | 首钢京唐钢铁联合有限责任公司 | Iron ore powder cost performance evaluation method |
| CN109211631B (en) * | 2018-09-14 | 2020-07-03 | 北京科技大学 | Method for measuring reflow property of iron-containing furnace burden |
| CN109283213A (en) * | 2018-11-29 | 2019-01-29 | 安徽工业大学 | A kind of judgment method of Iron Ore Powder anabolic reaction performance |
| CN113464997B (en) * | 2020-04-24 | 2022-06-10 | 海信集团有限公司 | Range hood and control method and device |
| CN112611678B (en) * | 2020-07-21 | 2023-06-27 | 华北理工大学 | Iron ore powder liquid phase fluidity detection method based on sintering actual production conditions |
| CN112782214A (en) * | 2020-11-25 | 2021-05-11 | 中南大学 | Method for measuring liquid phase generation characteristics in iron ore sintering process |
| CN112694322B (en) * | 2021-01-28 | 2023-11-10 | 中冶赛迪技术研究中心有限公司 | Sintered body, preparation method thereof and characterization method of high-temperature spreading behavior |
| CN113820343B (en) * | 2021-08-18 | 2024-09-10 | 首钢集团有限公司 | Method for detecting high-temperature liquid phase generation proportion of sinter |
| CN113960102A (en) * | 2021-09-24 | 2022-01-21 | 宣化钢铁集团有限责任公司 | Method for measuring assimilation performance of iron ore powder |
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| JPH01152223A (en) * | 1987-12-10 | 1989-06-14 | Nkk Corp | Manufacture of sintered ore |
| CN102213659A (en) * | 2011-04-12 | 2011-10-12 | 河北钢铁股份有限公司邯郸分公司 | Method for researching sintering performance of iron ore by utilizing mini-sintering test |
| CN102809579A (en) * | 2012-07-23 | 2012-12-05 | 辽宁科技大学 | Method for detecting high-temperature mineralization characteristic of sintered iron ores |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01152223A (en) * | 1987-12-10 | 1989-06-14 | Nkk Corp | Manufacture of sintered ore |
| CN102213659A (en) * | 2011-04-12 | 2011-10-12 | 河北钢铁股份有限公司邯郸分公司 | Method for researching sintering performance of iron ore by utilizing mini-sintering test |
| CN102809579A (en) * | 2012-07-23 | 2012-12-05 | 辽宁科技大学 | Method for detecting high-temperature mineralization characteristic of sintered iron ores |
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