AU2017227235B2 - Method for manufacturing sintered ore - Google Patents
Method for manufacturing sintered ore Download PDFInfo
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- AU2017227235B2 AU2017227235B2 AU2017227235A AU2017227235A AU2017227235B2 AU 2017227235 B2 AU2017227235 B2 AU 2017227235B2 AU 2017227235 A AU2017227235 A AU 2017227235A AU 2017227235 A AU2017227235 A AU 2017227235A AU 2017227235 B2 AU2017227235 B2 AU 2017227235B2
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 128
- 239000002245 particle Substances 0.000 claims abstract description 107
- 238000005245 sintering Methods 0.000 claims abstract description 79
- 229910052742 iron Inorganic materials 0.000 claims abstract description 64
- 239000000843 powder Substances 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 76
- 239000002994 raw material Substances 0.000 claims description 52
- 238000002425 crystallisation Methods 0.000 claims description 25
- 230000008025 crystallization Effects 0.000 claims description 25
- 239000007767 bonding agent Substances 0.000 claims description 11
- 239000011361 granulated particle Substances 0.000 abstract description 24
- 230000004931 aggregating effect Effects 0.000 abstract 1
- 239000008187 granular material Substances 0.000 abstract 1
- 238000005469 granulation Methods 0.000 description 30
- 230000003179 granulation Effects 0.000 description 30
- 238000013019 agitation Methods 0.000 description 22
- 230000003247 decreasing effect Effects 0.000 description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 238000013329 compounding Methods 0.000 description 10
- 238000004220 aggregation Methods 0.000 description 8
- 230000002776 aggregation Effects 0.000 description 8
- 239000000571 coke Substances 0.000 description 8
- 235000019738 Limestone Nutrition 0.000 description 7
- 239000006028 limestone Substances 0.000 description 7
- 230000035699 permeability Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000011362 coarse particle Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- NWBJYWHLCVSVIJ-UHFFFAOYSA-N N-benzyladenine Chemical compound N=1C=NC=2NC=NC=2C=1NCC1=CC=CC=C1 NWBJYWHLCVSVIJ-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- -1 return ore Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The purpose of the present invention is to propose a sintered ore manufacturing method that makes it possible to manufacture high strength granulated particles even when using iron ore containing large amounts of fine powder, which is difficult to granulate, and with which high quality sintered ore can be obtained. The manufacturing method is characterized in that a sintering feedstock, which is made from iron ore containing at least 20 mass% of nucleus particles of at least 1 mm grain diameter and containing 10-50 mass% of fine powder with grain diameter of 0.125 mm or less, an aggregating material, and an auxiliary feedstock, is granulated after being stirred using a high speed stirrer, and then fired.
Description
METHOD FOR MANUFACTURING SINTERED ORE
Technical Field [0001] This invention relates to a method for manufacturing a sintered ore as a raw material for a blast furnace used in a Dwight-Lloyd type sintering machine or the like.
Background [0002] Sintered ore is manufactured by compounding powdery iron ores of plural brands (which is generally called as a sinter feed of about 125-1000 pm) with adequate quantities of auxiliary material powder such as limestone, silica stone, serpentinite or the like, miscellaneous material powder such as dust, scale, return ore or the like and solid fuel such as coke breeze or the like to form a raw compounding material for sintering, adding water thereto, mixing and granulating the resulting mixture, charging the resulting granulated raw material into a sintering machine and then sintering therein. The raw compounding material for sintering usually contains water and is agglomerated during granulation to form quasi particles. Such quasi-granulated raw material for sintering is useful for ensuring good gas permeability in a charging layer of the sintering machine and proceeds a sintering reaction smoothly. In the sintering reaction, water is evaporated by heating the granulated particles, and hence water content of granulated particles located at a downstream side becomes high to form a zone having a decreased strength (wet zone). The wet zone is liable to crush the granulated particles and blocks a flow path of air in the charging layer to deteriorate gas permeability.
[0003] Fine pulverization of the iron ore has been recently advanced, and the particles granulated from such fine powdery iron ore becomes small in the strength. Particularly, the strength is largely decreased in the addition of water, which has a problem of causing reduction of gas permeability. Also, it is known that fine powdery iron ore is difficult to conduct granulation which is important in the manufacture of sintered ore. Under such an environment surrounding the
-2powdery iron ore for sintering is recently proposed a technique for manufacturing a high-quality sintered ore by using an iron ore containing a large amount of hardly-granulating fine powder.
[0004] Heretofore, the following techniques have been known as a method for manufacturing a sintered ore as a raw material for a blast furnace (Patent Literatures 1-9).
Citation List
Patent Literature
| [0005] | Patent Literature 1: | JP-A-S62-37325 |
| Patent Literature 2: | JP-A-H01-312036 | |
| Patent Literature 3: | JP-A-2007-247020 | |
| Patent Literature 4: | JP-A-H11-61282 | |
| Patent Literature 5: | JP-A-H07-331342 | |
| Patent Literature 6: | JP-A-H07-48634 | |
| Patent Literature 7: | JP-A-2005-194616 | |
| Patent Literature 8: | JP-A-2006-63350 | |
| Patent Literature 9: | JP-A-2003-129139 | |
| [0006] | Patent Literature 1 discloses a hybrid pelletized sintering method |
(hereinafter referred to as HPS method). This technique is made to manufacture a sintered ore having a low slag ratio and a high reducibility by granulating a raw compounding material for sintering containing a large amount of fine powdery iron ore with a high iron content using a drum mixer and a pelletizer. However, this technique has a problem that the production cost becomes high because it is necessary to provide many pelletizers when a great amount of the sintering raw material is treated.
[0007] Also, there are proposed a method of previously mixing fine powdery iron ore and iron-making dust in an agitating mixer prior to a granulation step and further performing granulation in the agitating mixer and a method of agitating a sintering raw material composed mainly of fine powdery iron ore in an agitator and granulating in a granulating machine (Patent Literatures 2-3). In these methods, however, the granulated particles are composed mainly of fine powdery raw material, so that there is a problem that the strength of the granulated
-3particles is decreased as compared to a case having nuclear particles (iron ore) with a strength higher than that of the granulated particles.
[0008] Further, there are a proposed a method that a sintering raw material formed by compounding fine powdery iron ore and sinter feed is previously mixed in an Eirich mixer and then granulated in a drum mixer and so on (Patent Literatures 4-6). In these methods, however, an amount of an attached powder layer becomes excessive when a ratio of fine powdery iron ore is increased, and hence the combustibility of the granulated particles is deteriorated. The granulation property is also deteriorated due to short of nuclear particles, causing a problem that sintering is performed at a state of incomplete granulation.
[0009] Further, there is proposed method that hardly-granulating ore containing fine powdery iron ore and a high content of crystallization water is processed (Patent Literatures 7-9). In this case, however, it is difficult to prevent an increase of pressure loss in a wet zone due to the evaporation of a large amount of water from high-crystalline iron ore during the sintering. Also, when a large amount of the fine powdery iron ore liable to decrease the strength of the granulated particles is used, there is a problem that the pressure loss in the wet zone is further increased.
Summary of the Invention [0010] The present invention is made focused on the above problems, and proposes a method for manufacturing a sintered ore in which high-strength granulated particles can be produced even in the use of iron ore containing a great amount of hardly-granulating fine powder and also a high-quality sintered ore can be obtained.
[0011] The inventors have studied a method of increasing a strength of granulated particles in the case of using fine powdery iron ore, a method of decreasing an evaporation of crystallization water to suppress an increase of pressure loss in a wet zone, and a method of performing granulation efficiently in the use of ore containing a low content of crystallization water and a large amount of fine powder, and as a result, the invention has been accomplished. [0012] That is, the proposed invention relates to a method for manufacturing a sintered ore, characterized in that a sintering raw material composed of an iron
-4ore containing not less than 20 mass% of nuclear particles with a particle size of not less than 1 mm and 10-50 mass% of fine powder with a particle size of not more than 0.125 mm, a bonding agent and an auxiliary material is agitated in a high-speed agitator, wherein a circumferential velocity of an agitating blade in the high-speed agitator is not less than 6 m/s and a water content in a pretreatment through the high-speed agitator is not more than 6 mass%, granulated and then sintered.
[0013] Moreover, the followings are considered to be a more preferable means in the method for manufacturing a sintered ore according to the invention:
(1) the sintering raw material containing iron ore inclusive of 25-40 mass% of fine powder with a particle size of not more than 0.125 mm is agitated and granulated; and (2) the iron ore contains not more than 4 mass% of crystallization water.
[0014] According to the invention, even when iron ore containing a large amount of hardly-granulating fine powder is used, a high-quality sintered ore can be manufactured by containing a large amount of the nuclear particles, and also it is possible to improve a productivity of sintered ore.
Brief Description of Drawings [0015] FIG. 1 is a schematic view illustrating an example of equipment row for carrying out the method for manufacturing a sintered ore according to the invention.
FIG. 2 is a graph showing a comparison of a sintering productivity between a case performing a high-speed agitation and a case performing no high-speed agitation when a ratio of fine powdery iron ore is varied.
FIG. 3 is a graph showing a relation between a ratio of nuclear particles and a sintering productivity.
FIG. 4 is graph showing a relation between a circumferential velocity of an agitating blade in a high-speed agitator and a harmonic mean diameter.
FIG. 5 is a graph showing a relation between a water content and a ratio of particles having a particle size of not less than 4.75 mm in the agitation.
-5Detailed Description of the Invention [0016] FIG. 1 is a schematic view illustrating an example of an equipment row for performing the method for manufacturing a sintered ore according to the invention. The manufacturing method of a sintered ore according to the invention is described with reference to FIG. 1. There is first provided a sintering raw material 11 composed of an iron ore containing not less than 20 mass% of nuclear particles with a particle size of not less than 1 mm and 10-50 mass% of fine powder with a particle size of not more than 0.125 mm, a bonding agent and an auxiliary material. The sintering raw material 11 is preferable to be composed of iron ore containing not less than 30 mass% of the nuclear particles with a particle size of not less than 1 mm and 10-50 mass% of fine powder with a particle size of not more than 0.125 mm, a bonding agent such as coke breeze or the like, and an auxiliary material such as return ore, silica stone, lime, quicklime or the like.
[0017] Then, a pretreatment of the prepared sintering raw material 11 is performed in a high-speed agitator 12. A purpose of the high-speed agitator 12 is intended to suppress the formation of coarse granulated particles, an aggregate of the fine powder as a seed of the coarse granulated particles is crushed before the granulation. In order to crush the aggregate of the fine powder efficiently, it is effective to directly peel the fine powder by microscopically applying shear force to the aggregate itself. As an example of the high-speed agitator 12 can be used, for example, an Eirich mixer, a Pellegaia mixer, a Proshear mixer or the like. Among them, the Eirich mixer is known as a high-speed agitating granulator and is an equipment possessing a granulation function associated with aggregation and growth of particles through liquid crosslinking.
[0018] The sintering raw material 11 subjected to the pretreatment in the high-speed agitator 12 is granulated by agitating and mixing in a drum mixer 13 under an addition of water. The sintering raw material 11 after the granulation is supplied to a sintering machine 14, whereby a sintered ore is formed in the
- 6 sintering machine 14. Then, the sintered ore is fed to a blast furnace 15 as a raw material for the blast furnace together with coke, limestone and so on to manufacture pig iron.
[0019] In the equipment row shown in FIG. 1, granulated particles after the granulation in the drum mixer are directly charged into the sintering machine and sintered therein, but the following equipment row can be taken as to the construction up to the sintering machine. That is, the invention can be preferably applied to (1) an equipment row arranging plural drum mixers such as an order of an agitator, a drum mixer and another drum mixer, and (2) an equipment row arranging a pelletizer between plural drum mixers such as an order of an agitator, a drum mixer, a pelletizer and another drum mixer, and (3) an equipment row arranging a drying process after the granulation in the drum mixer in order to further suppress the formation of the wet zone though the use of the ore containing a low content of crystallization water has been developed to decrease pressure loss in the wet zone in the invention.
[0020] The manufacture of the sintered ore according to the invention is performed by the aforementioned equipment row. The feature in the manufacturing method of the sintered ore according to the invention lies in a point that an iron ore containing not less than 20 mass% of nuclear particles with a particle size of not less than 1 mm and 10-50 mass% of fine powder with a particle size of not more than 0.125 mm is used as the sintering raw material and agitation in the high-speed agitator is performed as a pretreatment before the granulation.
[0021] In the manufacturing method of the sintered ore according to the invention, not less than 20 mass% of nuclear particles with the particle size of not less than 1 mm are contained in the iron ore, so that the nuclear particles act as a core in the granulation, and hence the granulation is promoted as compared to a case containing a small number of nuclear particles. Since the granulated particles containing a large amount of the fine powdery iron ore are low in the strength, it is important to suppress the breakage of the granulated particles to the pressure in order to increase the strength. To this end, the nuclear particles having a strength higher than that of the aggregate of the fine powdery iron ore
-7are used to decrease a portion liable to be broken in the granulated particles, which leads to increase the strength of the particles.
[0022] The reason for limiting to the nuclear particles with the particle size of not less than 1 mm is due to the fact that the particle size of the nuclear particles is generally not less than 1 mm. Also, the reason why the amount of the nuclear particles is limited to not less than 20 mass% is due to the fact that when the amount of the nuclear particles is less than 20 mass%, the sintering productivity is deteriorated as seen from the result of Example 2 below. Further, the amount is preferably not less than 30 mass%. The upper limit is not particularly placed, but it is preferable to be not more than 80 mass%.
[0023] In the manufacturing method of the sintered ore according to the invention, 10-50 mass% of the fine powdery iron ore with the particle size of not more than 0.125 mm is included in the iron ore. However, the raw material containing a large amount of the fine powdery iron ore is apt to easily form granulated particles made from only the fine powder having a low strength due to biased water. By using the high-speed agitator, these particles are broken and the aggregation of the fine powdery iron ore is crushed to disperse the raw material uniformly. Thus, the aggregation of the fine powder is solved and the attached powder layer is decreased, whereby it is possible to manufacture high-strength granulated particles.
[0024] The reason why 10-50 mass% of the fine powdery iron ore with the particle size of not more than 0.125 mm is included in the iron ore is due to the fact that when the amount is less than 10 mass%, a quasi-particle having a weak bonding strength cannot be formed, while when it exceeds 50 mass%, there is a problem that coarse particles having a weak bonding strength are formed. The upper limit is set to 50 mass% because the fine powdery iron ore of not more than 125 pm is not substantially compounded into the iron ore in an amount exceeding 50 mass%. The reason why the particle size is limited to not more than 125 μπι is due to the fact that the adhesion force indicating an adhesiveness between mutual particle layers in a powder filled layer added with water is increased when the particle size is not more than 125 pm to show an extremely-different behavior of granulation property.
-8[0025] In the manufacturing method of the sintered ore according to the invention, the crushing with the high-speed agitator requires a force enough to break the aggregation of the fine powdery iron ore. It is possible to break the aggregation of the fine powdery iron ore by applying a force larger than a conventionally-proposed circumferential velocity of the agitating blade. Also, the aggregation of the fine powdery iron ore is already high when the water content of the sintering raw material reaches the water content of granulation. Therefore, the raw material is agitated at a state of a low water content before the addition of water to further promote the effect of breaking the aggregation of the fine powdery iron ore.
[0026] In a preferable example of the manufacturing method of the sintered ore according to the invention is proposed a method for manufacturing the sintered ore, in which a sintering raw material is granulated by using an ore having a low content of crystallization water, which causes to form a wet zone, in order to suppress the wet zone also causing a decreased production in the use of fine powdery iron ore. In the granulated particles obtained by this method, the occurrence of water is decreased when the temperature is raised in the sintering machine as compared to the case of using an ore containing a high content of crystallization water as previously mentioned. When the water content in the wet zone is decreased, the pressure loss of the wet zone is decreased to improve gas permeability in the sintering raw material (sintering bed) during the sintering. As a result, it is possible to improve the productivity of sintered ore. Also, an effect of decreasing the bonding agent as a fuel can be obtained by suppressing the evaporation of water.
[0027] The above explanation is made with reference to the embodiment of the invention. After the high-speed agitation according to the invention, the total volume of the granulated particles can be used as the sintering raw material. Furthermore, the use of a sintering raw material obtained by mixing the granulated particles formed by granulation after the high-speed agitation according to the invention with granulated particles formed by granulation without high-speed agitation is included within a scope of the invention. Moreover, the invention is not limited to the construction described in the above
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-9embodiment and includes other conceivable embodiments and modified examples within matters described in the following claims.
Examples [0028] There will be described examples performed to confirm the effects of the invention below.
In the invention, a nuclear particle ratio is defined as a weight ratio of particles with a particle size of not less than 1 mm, and a fine powder ratio is defined as a weight ratio of particles with a particle size of not more than 0.125 mm in the iron ore. Here, a sampled iron ore is dried and sieved with a mesh defined in JIS Z 8801 to measure the weight of each particle, and then a weight ratio of each particle is calculated from the total weight of the iron ore. Also, a water content of a sintering raw material is a value obtained by dividing a weight of water in the sintering raw material by a weight of the sintering raw material containing water, which is a value calculated from the dried sintering raw material and the weight of water added in the invention. In this case, the sintering raw material contains the above iron ore containing the nuclear particles and fine powder, a bonding agent, and an auxiliary material. In general, a sintering raw material is obtained by compounding powdery iron ores of plural brands with proper amounts of an auxiliary material powder such as limestone, silica stone, serpentinite or the like, a miscellaneous material powder such as dust, scale, return ore or the like, a binder such as quicklime or the like and a bonding agent as a solid fuel such as coke breeze or the like.
[0029] <Example 1: influence of high-speed agitation and fine powder ratio>
As a sample is used an iron ore containing not less than 30 mass% of nuclear particles with a particle size of not less than 1 mm and not more than 4 mass% of crystallization water and having a fine powder ratio of 10 mass% (nuclear particle: 42 mass%, crystallization water; 4 mass%), 25 mass% (nuclear particle: 40 mass%, crystallization water: 3 mass%) or 40 mass% (nuclear particle: 36 mass%, crystallization water: 3 mass%). Here, the crystallization water of the sample is an average value measured from a weight ratio of crystallization water in each compounded iron ore as a weighted mean. In the invention, the crystallization water in the compounded iron ore is determined by
- 10 the above calculation method of the average value. The crystallization water of each iron ore is measured in accordance with JIS M 8700. The sintering raw material is obtained by compounding 69-70 mass% of the iron ore with 16 mass% of return ore, 14 mass% of limestone and 0-1 mass% of silica stone in the inner percentage and adding 5 mass% of coke breeze as a bonding agent in the outer percentage. Further, water is added so as to render the water content of the sintering raw material into 6 mass%.
[0030] With respect to these samples are conducted tests when a pretreatment with a high-speed agitator is used or not used. As the high-speed agitator is used an Eirich mixer in which a length of an agitating blade as a diameter is 350 mm, and a diameter of a vessel is 750 mm. A circumferential velocity v (m/s) of the agitating blade is calculated as v = 0.35 x π x N/60 from the number of revolutions N (rpm) of the agitating blade and the length of the agitating blade of 350 mm. In the invention, the agitation is conducted at a circumferential velocity of 6 m/s for 60 seconds.
[0031] Thereafter, water is added so as to render the water content of the sintering raw material into 7 mass%, during which granulation is performed in a drum mixer for 5 minutes and then sintering is conducted in a pot testing machine. A sinter cake after the sintering is dropped from a height of 2 m once to obtain particles with a particle size of+10 mm as a product, and a yield is calculated by dividing the weight of the product by (weight of sinter cake - weight of bedding ore). A sintering productivity (t/(m2 · h)) is a value obtained by dividing the weight of the product by a sintering time and a sectional area of the testing pot.
[0032] The measured results are shown in FIG. 2. As seen from FIG. 2, when the fine powder ratio is increased as compared to the usual fine powder ratio of not less than 10 mass%, the sintering productivity is decreased in the case of using only the drum mixer. On the other hand, when the pretreatment through the high-speed agitation is conducted, the sintering productivity is decreased with the increase of the fine power, but the decrease is considerably suppressed as compared to the case when granulation is conducted only in the drum mixer.
[0033] <Example 2: influence of nuclear particle ratio>
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- 11 A test is conducted with an iron ore containing not more than 4 mass% of crystallization water and having a fine powder ratio with a particle size of not more than 0.125 mm of 40 mass% by varying a nuclear particle ratio. The nuclear particle ratio is 13 mass% (crystallization water: 2 mass%), 25 mass% (crystallization water: 2 mass%), 32 mass% (crystallization water: 2 mass%) or 43 mass% (crystallization water: 4 mass%). A sintering raw material is obtained by compounding 69-70 mass% of the iron ore with 16 mass% of return ore, 14 mass% of limestone and 0-1 mass% of silica stone in the inner percentage and adding 5 mass% of coke breeze as a bonding agent in the outer percentage. Water is added so as to render the water content of the sintering raw material into 6 mass%. Such a sample is agitated in a high-speed agitator. In the high-speed agitator, a length of an agitating blade as a diameter is 350 mm and a diameter of a vessel is 750 mm. In the invention, the agitation is performed at a circumferential velocity of 6 m/s for 60 seconds. Water is added so as to render the water content of the sintering raw material into 7 mass%, during which granulation is performed with a drum mixer for 5 minutes and sintering is conducted in a pot testing machine.
[0034] The measured results are shown in FIG. 3. As seen from FIG. 3, the sintering productivity is improved when the amount of nuclear particles is not less than 20 mass%, and particularly the sintering productivity is considerably improved when the nuclear particles are used in an amount of not less than 30 mass%. This is considered due to the fact that the strength of the granulated particles is increased by the inclusion of the nuclear particles and the granulation is promoted by including the nuclear particles into the sintering raw material to improve gas permeability during the sintering.
[0035] <Example 3: preferable circumferential velocity of agitating blade in a high-speed agitator>
A preferable circumferential velocity is examined when a sintering raw material containing a low content of crystallization water and having a high fine powder ratio and a nuclear particle ratio is treated by a high-speed agitation. As a condition of a sample is used an iron ore containing 2 mass% of crystallization water and having a fine powder ratio of 25 mass% and a nuclear
- 12 particle ratio of 30 mass%. A sintering raw material is obtained by compounding 70 mass% of the iron ore with 16 mass% of return ore and 14 mass% of limestone in the inner percentage and adding 5 mass% of coke breeze as a bonding agent in outer percentage. Water is added so as to render the water content of the sintering raw material into 6 mass%.
[0036] The sample is agitated by means of a high-speed agitator for 60 seconds. In the high-speed agitator, a length of an agitating blade is 350 mm as a diameter and a diameter of a vessel is 750 mm. In the invention, a circumferential velocity is varied in a range of 0 to 12 m/s. Thereafter, water is added to the sintering raw material so as to render the water content into 7 mass%, during which granulation is conducted in a drum mixer for 5 minutes. In this example is evaluated a harmonic mean diameter of particles after the granulation. The harmonic mean diameter is an indication usually used for evaluating gas permeability of a powder layer. As the harmonic mean diameter becomes larger, the granulation is more promoted to improve gas permeability.
[0037] The harmonic mean diameter is determined by taking 1 kg of a powder sample after the agitation, drying and sieving the powder sample with sieves having mesh sizes of 0.25, 0.5, 1, 2. 8, 4.75 and 8 mm in the order of wider mesh size to measure a weight ratio of each particle size. The harmonic mean diameter is calculated by the following equation (1):
Here, w, is a weight ratio obtained in each particle size, and Xj is a typical particle size in the each particle size. The typical particle size in the each particle size is 0.125 mm in particles of not more than 0.25 mm and 8 mm in particles of not less than 8 mm through the geometric mean between the larger mesh size and the smaller mesh size, which is a geometric mean of maximum particle size in the sampled particles.
[0038] In FIG. 4 is shown a harmonic mean diameter of the granulated
- 13 particles after the granulation in the drum mixer. As seen from this result, the harmonic mean diameter is increased with the increase of the circumferential velocity till the circumferential velocity reaches 6 m/s. When the circumferential velocity is not less than 6 m/s, the harmonic mean diameter is constant. The reason why the harmonic mean diameter is increased with the increase of the circumferential velocity is due to the fact that the dispersion of water in the sintering raw material with the agitating blades is insufficient when the circumferential velocity is low in the agitation and particles not granulated retain owing to the poor water dispersion. When the circumferential velocity is sufficiently large, the dispersion of water is sufficient and particles not granulated are decreased to increase the harmonic mean diameter.
[0039] <Example 4: influence of water content before agitation>
There is examined a preferable water content before agitation when a sintering raw material made from an ore containing a low content of crystallization water and having a high fine powder ratio and a high nuclear particle ratio is treated through a high-speed agitation. As a condition of a sample is used an iron ore containing 2 mass% of crystallization water and having a fine powder ratio of 25 mass% and a nuclear particle ratio of 30 mass%. A sintering raw material is obtained by compounding 70 mass% of the iron ore with 16 mass% of return ore and 14 mass% of limestone in the inner percentage and adding 5 mass% of coke breeze as a bonding agent in the outer percentage. Water is added so as to render the water content of the sintering raw material into 0-7 mass%. Thereafter, granulation is conducted in a drum mixer for 5 minutes while adding water so as to render the water content of the sintering raw material into 7 mass%.
[0040] In this test, an evaluation is made by a ratio of larger particles having a particle size of not less than 4.75 mm among particles after the agitation in order to examine the water content easily crushing aggregates of fine powder through the agitation. In general, granulated particles are formed by a process for manufacturing particles of 3-5 mm. Particles having a particle size of not less than 4.75 mm before the granulation form coarse particles after the granulation, and such coarse particles cause the deterioration of combustibility in
- 14the sintering. Therefore, it is desirable to decrease particles having a particle size of not less than 4.75 mm among particles after the agitation. Also, the decrease of the particles having a particle size of not less than 4.75 mm means crushing of fine powder attached to the nuclear particles. This is an indication that the dispersion of the fine powder is promoted and the raw material is dispersed and mixed uniformly.
[0041] In FIG. 5 is shown a water content in the agitation and a ratio of particles having a particle size of not less than 4.75 mm after the agitation. As seen from this result, the ratio of particles having a particle size of not less than 4.75 mm can be decreased by decreasing the water content. Especially, when the water content is not more than 6 mass%, the ratio of particles having a particle size of not less than 4.75 mm is constant. This is due to the fact that a water content of an aggregate of the fine powder in the sintering raw material is also decreased by the decrease of the water content. The adhesion force between particles required for aggregation is lowered by decreasing the water content of the aggregate of the fine powder, whereby crushing of the aggregate through the agitating blades is promoted.
[0042] The above is explained with reference to the embodiments, but the invention is not limited to the construction of the above embodiments and includes other embodiments and modified examples considered within a scope of matters described in the claims. For example, a case of constituting the mixing method of fine powder material according to the invention by combining a part or all of the above embodiments and modified examples is included within a scope of rights of the invention.
Industrial Applicability [0043] In the manufacturing method of the sintered ore according to the invention, a sintered ore having a high quality can be manufactured by containing a large amount of nuclear particles even when using an iron ore containing a large amount of hardly-granulating fine powder, and it is possible to improve the productivity of sintered ore, so that the invention can be preferably applied to the manufacturing method of various sintered ores.
Reference Signs List
- 15[0044] sintering raw material high-speed agitator drum mixer sintering machine blast furnace [0045] The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.
[0046] Throughout this specification and the claims which follow, unless the context requires otherwise, the word comprise, and variations such as comprises and comprising, will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
Claims (2)
- The Claims Defining the Invention are as Follows1. A method for manufacturing a sintered ore, characterized in that a sintering raw material composed of an iron ore containing not less than 20 mass%5 of nuclear particles with a particle size of not less than 1 mm and 10-50 mass% of fine powder with a particle size of not more than 0.125 mm, a bonding agent and an auxiliary material is agitated in a high-speed agitator, wherein a circumferential velocity of an agitating blade in the high-speed agitator is not less than 6 m/s and a water content in a pretreatment through the high-speed agitator10 is not more than 6 mass%, granulated and then sintered.
- 2. The method for manufacturing a sintered ore according to claim 1, wherein the sintering raw material containing an iron ore inclusive of 25-40 mass% of fine powder with a particle size of not more than 0.125 mm is agitated and granulated.15 3. The method for manufacturing a sintered ore according to claim 1 or 2, wherein the iron ore has not more than 4 mass% of crystallization water.
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| JP2016-042153 | 2016-03-04 | ||
| JP2016042153 | 2016-03-04 | ||
| PCT/JP2017/007419 WO2017150428A1 (en) | 2016-03-04 | 2017-02-27 | Sintered ore manufacturing method |
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| JP (1) | JP6508500B2 (en) |
| KR (1) | KR102189069B1 (en) |
| CN (1) | CN108699623B (en) |
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| JP6988712B2 (en) * | 2018-06-21 | 2022-01-05 | Ｊｆｅスチール株式会社 | Sintered ore manufacturing method |
| JP7110830B2 (en) * | 2018-08-29 | 2022-08-02 | 日本製鉄株式会社 | Granulation method of mixed raw materials |
| WO2020218170A1 (en) * | 2019-04-23 | 2020-10-29 | 株式会社神戸製鋼所 | Method for producing iron ore pellet |
| JP7366832B2 (en) * | 2019-04-23 | 2023-10-23 | 株式会社神戸製鋼所 | Method for manufacturing iron ore pellets |
| JP7419155B2 (en) | 2020-05-07 | 2024-01-22 | 株式会社神戸製鋼所 | Method for manufacturing iron ore pellets |
| CN114804822B (en) * | 2022-04-06 | 2023-05-02 | 西安墙体材料研究设计院有限公司 | Method for preparing sintered pavement brick by utilizing vanadium tailings |
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| JP2013204058A (en) * | 2012-03-27 | 2013-10-07 | Jfe Steel Corp | Method for manufacturing pseudo particle for sintered ore, and method for manufacturing the sintered ore |
| JP5846402B1 (en) * | 2014-04-01 | 2016-01-20 | Ｊｆｅスチール株式会社 | Production equipment for granulating raw materials for sintering |
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| JP3397091B2 (en) | 1997-08-18 | 2003-04-14 | 日本鋼管株式会社 | Sinter production method |
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| JP4356929B2 (en) | 2003-12-08 | 2009-11-04 | 株式会社神戸製鋼所 | Method for producing sintered ore |
| JP4231468B2 (en) | 2004-08-24 | 2009-02-25 | 株式会社神戸製鋼所 | Method for producing sintered ore |
| JP4568243B2 (en) | 2006-03-17 | 2010-10-27 | 新日本製鐵株式会社 | Method of kneading fine powder material |
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| JP5464317B2 (en) * | 2007-11-22 | 2014-04-09 | Ｊｆｅスチール株式会社 | Manufacturing method of forming raw material for sinter production |
| KR101328256B1 (en) * | 2011-12-12 | 2013-11-14 | 주식회사 포스코 | Method for manufacturing sintered ore |
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| JP6036295B2 (en) * | 2012-12-28 | 2016-11-30 | 新日鐵住金株式会社 | Pretreatment method of sintering raw materials |
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| JP2013204058A (en) * | 2012-03-27 | 2013-10-07 | Jfe Steel Corp | Method for manufacturing pseudo particle for sintered ore, and method for manufacturing the sintered ore |
| JP5846402B1 (en) * | 2014-04-01 | 2016-01-20 | Ｊｆｅスチール株式会社 | Production equipment for granulating raw materials for sintering |
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| CN108699623A (en) | 2018-10-23 |
| WO2017150428A1 (en) | 2017-09-08 |
| AU2017227235A1 (en) | 2018-09-27 |
| BR112018067367B1 (en) | 2022-05-03 |
| KR20180110034A (en) | 2018-10-08 |
| CN108699623B (en) | 2022-05-10 |
| KR102189069B1 (en) | 2020-12-09 |
| JPWO2017150428A1 (en) | 2018-06-21 |
| BR112018067367A2 (en) | 2019-01-15 |
| PH12018550145A1 (en) | 2019-03-18 |
| JP6508500B2 (en) | 2019-05-08 |
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