CN103103341A - Control method of iron particle granularity in deep reduction material - Google Patents

Control method of iron particle granularity in deep reduction material Download PDF

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Publication number
CN103103341A
CN103103341A CN2013100338259A CN201310033825A CN103103341A CN 103103341 A CN103103341 A CN 103103341A CN 2013100338259 A CN2013100338259 A CN 2013100338259A CN 201310033825 A CN201310033825 A CN 201310033825A CN 103103341 A CN103103341 A CN 103103341A
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China
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iron
particle
grain graininess
granularity
iron particle
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CN2013100338259A
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高鹏
韩跃新
孙永升
李艳军
任多振
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Northeastern University China
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Northeastern University China
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Abstract

The invention discloses a control method of iron particle granularity in a deep reduction material, and relates to the technical field of deep reduction of iron ore. The method comprises the following steps of: preparing a reduzate, then, uniformly mixing the reduzate with resin, grinding and polishing to prepare a polished section and photographing the polished section, performing binarization processing to the photographed polished section, and then performing automatic analytic statistics to the binary image to obtain radius of equivalent circle of all iron particles in each field; respectively drawing characteristic curves between reduction temperature and iron particle granularity and between reduction time and iron particle granularity, and performing data regression simulation according to the iron particle granularity characteristic curves to obtain the relation between deep reducing condition and the iron particle granularity; and finally, controlling the iron particle granularity according to the iron particle granularity demand by means of the backstepping and calculating the deep reducing condition through the relation. According to the method disclosed by the invention, the iron particle granularity of the deep reduction material in iron core is controlled according to the characteristic curves, so that the double purposes of meeting the product index and saving energy and reducing consumption are satisfied.

Description

The control method of iron grain graininess in a kind of drastic reduction material
Technical field
The present invention relates to the drastic reduction technical field of iron ore, the control method of iron grain graininess in a kind of especially drastic reduction material.
Background technology
In recent years, low for some Refractory iron ore stone grade, the dip-dye granularity is fine, the characteristics of mineral composition complexity, China related scientific research worker breaks through the traditional idea of ore dressing-pelletizing (sintering)-blast furnace, propose some Refractory iron ore stone of employing " drastic reduction " technical finesse, realized the efficiently concentrating of iron.Drastic reduction refers to Refractory iron ore stone make iron mineral be reduced to metallic iron, and make metallic iron be grown to the process of certain particle size iron particle under the temperature higher than magnetizing roasting and stronger reducing atmosphere.Drastic reduction comprises reduction of ferrous oxide and iron granule two processes of growing up, and the main evaluation index of drastic reduction is degree of metalization at present, but degree of metalization only can be estimated the reducing degree of ferriferous oxide, can not carry out effective evaluation to the granularity of iron particle.When adopting the fine iron ore of some dip-dye granularity of drastic reduction technical finesse, although can obtain degree of metalization up to 98% reducing material, but after magnetic separation, the iron powder grade is only 70% left and right, and its major cause is that after reduction, the iron particle is still fine, causes the follow-up difficulty that sorts.According to practical experience, as the d of iron grain graininess 50During 〉=400 μ m, can obtain the good reduced iron powder of index.Therefore, iron grain graininess feature is the important factor that affects the drastic reduction product index.
Summary of the invention
Deficiency for the prior art existence, the control method that the purpose of this invention is to provide iron grain graininess in a kind of drastic reduction material, adopt digital image processing techniques directly the iron particle to be carried out IMAQ, processing and analysis, reach product index and energy-saving and cost-reducing dual purpose.
Technical scheme of the present invention is achieved in that the control method of iron grain graininess in a kind of drastic reduction material, comprises the following steps:
Step 1: be 0.5~3.0 to join in Steel Crucible less than the reductive agent coal dust of 2mm by joining carbon ratio less than the iron ore of 2mm and granularity with granularity, when one-way heating stove furnace chamber temperature reaches 1125~1250 ℃, fast crucible is put into furnace chamber, be 10~60min heat-up time, then rapidly reducing material is taken out, shrend is cooled to room temperature;
Step 2: reducing material is evenly mixed with resin, be made into mating plate through grinding and polishing, use the observation by light microscope pattern, then choose at random the visual field of some amount and carry out photographic images on the cross section;
Step 3: the image of taking is carried out binary conversion treatment, then this bianry image is carried out the automatic analysis statistics, obtain the equalarea-circle radius of all iron particles in each visual field;
Step 4: according to particle equalarea-circle diameter, calculate the funtcional relationship between each grade productive rate Y and particle size diameter d, i.e. iron granule cumulative particle sizes rational curve formula:
Y ( d ) = Σ i = 1 n [ ( d i / 2 ) 3 × m i ] Σ i = 1 N [ ( d i / 2 ) 3 × m i ] × 100 %
In formula: Y is that granularity is less than the burden meter productive rate of d, %; D is the iron particle diameter, μ m; M is that diameter is the number of the iron particle of d, and unit is individual; N is iron particle grade sum; N is the iron particle grade sum of granularity≤d; I represents the grade of iron particle, and i=1,2,3 ... N;
Step 5: the result of utilizing step 4, draw out respectively reduction temperature and recovery time to the rational curve of iron grain graininess, according to the iron grain graininess characteristic curve that obtains, carry out again the data regression simulation, obtain the relation between drastic reduction condition and iron grain graininess, according to the requirement of iron grain graininess, utilize above-mentioned relation Extrapolation drastic reduction condition at last, control the size of iron grain graininess with this.
Described drastic reduction condition comprises: reduction temperature, recovery time, bed thickness and join carbon ratio.
Beneficial effect of the present invention: the present invention in systematically having examined or check the drastic reduction process reduction temperature, recovery time, bed thickness, join on the basis of the factor such as carbon ratio and raw meal particle size to iron grain graininess feature affects, adopt digital image processing techniques directly the iron particle to be carried out IMAQ, processing and analysis, obtain the grain size characteristic curve of iron particle.And according to the control of characteristic curve realization to iron grain graininess in iron ore drastic reduction material, reach product index and energy-saving and cost-reducing dual purpose.
Description of drawings
Fig. 1 is the control method schema of iron grain graininess in one embodiment of the present invention drastic reduction material;
Fig. 2 is one embodiment of the present invention drastic reduction material image;
Fig. 3 is one embodiment of the present invention binary conversion treatment schema;
Fig. 4 is iron particle cumulative particle sizes performance diagram under the different reduction temperatures of one embodiment of the present invention;
Fig. 5 is the cumulative particle sizes performance diagram of the different recovery time iron particles of one embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
Of the present invention providing adopts the control method of iron grain graininess in the drastic reduction material that the iron particle is measured and controlled, and its flow process as shown in Figure 1.
Embodiment 1:
Take Inner Mongol iron ore and common bituminous coal as raw material, wherein in iron ore, TFe is 32.2wt%, and FeO content is 9.10wt%, and coal dust fixed carbon and volatile matter are respectively 56.11 wt%, 30.45wt%.It is as follows that the control method that adopts iron grain graininess in the drastic reduction material is carried out measuring process to the iron particle: this process starts from step 101.In step 102, be 0.5 ~ 3.5 to join in Steel Crucible less than the reductive agent coal dust of 2mm by joining carbon ratio less than the iron ore of 2mm and granularity with granularity, when one-way heating stove furnace chamber temperature reaches 1125 ~ 1250 ℃, fast crucible is put into furnace chamber, be 60min heat-up time, then rapidly reducing material is taken out, shrend is cooled to room temperature.
In step 103, reducing material is evenly mixed with resin, be made into mating plate through grinding and polishing, use the observation by light microscope pattern, then choose at random the visual field of some amount and carry out photographic images on the cross section, as shown in Figure 2.
In step 104, Fig. 2 is carried out the operations such as edge enhance operation, filling-up hole computing, denoising computing and auto Segmentation and complete binary conversion treatment, then its flow process carries out the automatic analysis statistics to this bianry image as shown in Figure 3, finally can obtain the equalarea-circle radius of all iron particles in each visual field.
In step 105, according to particle equalarea-circle diameter, calculate the funtcional relationship between each grade productive rate (Y) and particle size diameter d, i.e. iron granule cumulative particle sizes rational curve formula:
Y ( d ) = Σ i = 1 n [ ( d i / 2 ) 3 × m i ] Σ i = 1 N [ ( d i / 2 ) 3 × m i ] × 100 %
In step 106, utilize the result of step 4, draw out respectively reduction temperature and recovery time to the rational curve of iron grain graininess.According to the iron grain graininess characteristic curve that obtains, adjusting the drastic reduction temperature is 1125 ~ 1200 ℃, and temperature rate of change is 25 ℃, fixes other factors and is in optimal condition, controls the size of iron grain graininess with this.
Result shows, when reduction temperature during lower than 1200 ℃, and the d of iron granule 50All be no more than 300 μ m; And when temperature surpasses 1225 ℃, the d of iron granule 50Reach about 560.3 μ m, can find simultaneously, when excess Temperature (1250 ℃), although the d of iron grain graininess 50Descend to some extent, but still greater than 400 μ m.This shows, and is too low or when too high when temperature, all is unfavorable for the granularity of iron particle.
Through repetition test, result proves, when reduction temperature is between 1215 ℃ ~ 1235 ℃, when other reductive condition is constant, can well control the granularity of iron particle more than 550 μ m, and extremely be conducive to next step assorting room.
Embodiment 2:
This embodiment is take west place in Hubei iron ore and common bituminous coal as raw material, and wherein in iron ore, TFe is 35.6wt%, and FeO content is 16.10wt%, and coal dust fixed carbon and volatile matter are respectively 56.11 wt%, 30.45wt%.It is as follows that the control method that adopts iron grain graininess in the drastic reduction material is carried out measuring process to the iron particle: this process starts from step 101.In step 102, be 0.5 ~ 3.5 to join in Steel Crucible less than the reductive agent coal dust of 2mm by joining carbon ratio less than the iron ore of 2mm and granularity with granularity, when one-way heating stove furnace chamber temperature reaches 1125 ℃, fast crucible is put into furnace chamber, be 10~60min heat-up time, then rapidly reducing material is taken out, shrend is cooled to room temperature.
In step 103, reducing material is evenly mixed with resin, be made into mating plate through grinding and polishing, use the observation by light microscope pattern, then choose at random the visual field of some amount and carry out photographic images on the cross section, as shown in Figure 2.
In step 104, Fig. 2 is carried out the operations such as edge enhance operation, filling-up hole computing, denoising computing and auto Segmentation and complete binary conversion treatment, then its flow process carries out the automatic analysis statistics to this bianry image as shown in Figure 3, finally can obtain the equalarea-circle radius of all iron particles in each visual field.
In step 105, according to particle equalarea-circle diameter, calculate the funtcional relationship between each grade productive rate (Y) and particle size diameter d.
In step 106, utilize the result of step 105, draw out respectively reduction temperature and recovery time to the rational curve of iron grain graininess.According to the iron grain graininess characteristic curve that obtains, adjusting the drastic reduction time is 10~60min, and the time variable gradient is 10min, fixes other factors and is in optimal condition, controls the size of iron grain graininess with this.
Result shows, when reduction temperature during lower than 30min, and the d of iron granule 50All be no more than 400 μ m; And when temperature surpasses 40min, the d of iron granule 50More than reaching 400 μ m, can find simultaneously, continue overtime when the time, although the d of iron grain graininess 50Under continuing to increase, this shows that the prolongation of time is conducive to growing up of iron grain graininess.
Through repetition test, result proves, is between 40 ~ 60min when the recovery time, when other reductive condition is constant, can well control the d of iron particle 50Granularity and extremely is conducive to next step assorting room more than 400 μ m.
Above test-results shows, the present invention proposes a kind of control method based on iron grain graininess feature in the iron ore drastic reduction material of digital image processing, by control reduction temperature and the variation of recovery time in the drastic reduction process, controlled simply and easily the grain size characteristic of iron particle, follow-up screening test has also further proved the importance of iron grain graininess feature, according to this control method, for obtaining work of high quality and realizing the energy-saving and cost-reducing effect of having played highly significant.
Although more than described the specific embodiment of the present invention, the those skilled in the art in this area should be appreciated that these only illustrate, and can make various changes or modifications to these embodiments, and not deviate from principle of the present invention and essence.Scope of the present invention is only limited by appended claims.

Claims (2)

1. the control method of iron grain graininess in a drastic reduction material is characterized in that: comprise the following steps:
Step 1: be 0.5~3.0 to join in Steel Crucible less than the reductive agent coal dust of 2mm by joining carbon ratio less than the iron ore of 2mm and granularity with granularity, when one-way heating stove furnace chamber temperature reaches 1125~1250 ℃, fast crucible is put into furnace chamber, be 10~60min heat-up time, then rapidly reducing material is taken out, shrend is cooled to room temperature;
Step 2: reducing material is evenly mixed with resin, be made into mating plate through grinding and polishing, use the observation by light microscope pattern, then choose at random the visual field of some amount and carry out photographic images on the cross section;
Step 3: the image of taking is carried out binary conversion treatment, then this bianry image is carried out the automatic analysis statistics, obtain the equalarea-circle radius of all iron particles in each visual field;
Step 4: according to particle equalarea-circle diameter, calculate the funtcional relationship between each grade productive rate Y and particle size diameter d, i.e. iron granule cumulative particle sizes rational curve formula:
Y ( d ) = Σ i = 1 n [ ( d i / 2 ) 3 × m i ] Σ i = 1 N [ ( d i / 2 ) 3 × m i ] × 100 %
In formula: Y is that granularity is less than the burden meter productive rate of d, %; D is the iron particle diameter, μ m; M is that diameter is the number of the iron particle of d, and unit is individual; N is iron particle grade sum; N is the iron particle grade sum of granularity≤d; I represents the grade of iron particle, and i=1,2,3 ... N;
Step 5: the result of utilizing step 4, draw out respectively reduction temperature and recovery time to the rational curve of iron grain graininess, according to the iron grain graininess characteristic curve that obtains, carry out again the data regression simulation, obtain the relation between drastic reduction condition and iron grain graininess, according to the requirement of iron grain graininess, utilize above-mentioned relation Extrapolation drastic reduction condition at last, control the size of iron grain graininess with this.
2. the control method of iron grain graininess in drastic reduction material according to claim 1, it is characterized in that: the described drastic reduction condition of step 5 comprises: reduction temperature, recovery time, bed thickness and join carbon ratio.
CN2013100338259A 2013-01-29 2013-01-29 Control method of iron particle granularity in deep reduction material Pending CN103103341A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108072595A (en) * 2017-12-04 2018-05-25 株洲硬质合金集团有限公司 With the method for WC grain sectional area particle diameter distribution characterization Mathematical Analysis of Al-li Alloy Containing Rare Earth structure

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US3645717A (en) * 1968-04-17 1972-02-29 Metallgesellschaft Ag Process of producing sponge iron pellets
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JP2009221530A (en) * 2008-03-14 2009-10-01 Yoshinosuke Shoji Method for shifting metal iron and titanium oxide raw material
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108072595A (en) * 2017-12-04 2018-05-25 株洲硬质合金集团有限公司 With the method for WC grain sectional area particle diameter distribution characterization Mathematical Analysis of Al-li Alloy Containing Rare Earth structure
CN108072595B (en) * 2017-12-04 2020-11-20 株洲硬质合金集团有限公司 Method for representing hard alloy structure by using WC crystal grain sectional area grain size distribution

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