WO2016068078A1 - 焼結機の操業方法 - Google Patents
焼結機の操業方法 Download PDFInfo
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- WO2016068078A1 WO2016068078A1 PCT/JP2015/080120 JP2015080120W WO2016068078A1 WO 2016068078 A1 WO2016068078 A1 WO 2016068078A1 JP 2015080120 W JP2015080120 W JP 2015080120W WO 2016068078 A1 WO2016068078 A1 WO 2016068078A1
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- 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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- 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
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
Definitions
- the present invention relates to a method for operating a sintering machine, which is characterized by a method for charging a sintering compound raw material.
- a sintered blending raw material containing magnetite fine iron ore, which is easier to magnetize than ordinary sintering raw materials, and a magnetic fine powder raw material, such as sintered ore is mounted on a pallet of a sintering machine.
- the sintered ore that is the main raw material of the blast furnace ironmaking method is iron ore powder, recovered powder in the steelworks such as mill scale and iron making dust, sinter ore sieving powder (sintered ore)
- Sintered blended raw materials such as CaO-containing raw materials such as limestone and dolomite, granulating aids such as quick lime, powdered coke, and charcoal (solid fuel) such as anthracite are placed on the pallet of the DL sintering machine.
- sinter ore sieving powder sintered blended raw materials such as CaO-containing raw materials such as limestone and dolomite
- granulating aids such as quick lime, powdered coke
- charcoal (solid fuel) such as anthracite
- the sintered blending raw material As the sintered blending raw material, a mixture of a plurality of kinds of sintered raw material powders using a drum mixer or the like and subsequent granulation are used to obtain pseudo particles having an arithmetic average diameter of 6.0 mm or less.
- the raw material for sinter production obtained in this way that is, the sintered blending raw material is charged on the pallet of the sintering machine to form a sintered raw material charging layer, also called a charging layer. It becomes the raw material of.
- the thickness (height) of the sintered raw material charging layer is about 400 to 800 mm.
- the sintered raw material charging layer is then ignited by the carbonaceous material contained in the sintered raw material charging layer in an ignition furnace installed above the pallet, and disposed below the pallet.
- the carbonaceous material in the sintering raw material charging layer is sequentially burned, and the combustion is matched to the movement of the pallet. It gradually advances downward and forward, and the sintering blended raw material is melted and converted into a sintered cake by the combustion heat generated at this time. Thereafter, the obtained sintered cake is cooled by a cooler after crushing, and sized, and becomes a product sintered ore made of agglomerates having a predetermined particle size (for example, 5.0 mm or more).
- the production amount of sintered ore is generally determined by the sintering production rate (t / hr ⁇ m 2 ) ⁇ sintering machine area (m 2 ).
- the production amount of sintered ore is the width and length of the sintering machine, the thickness of the raw material deposition layer (thickness of the sintering raw material layer), the bulk density of the sintering compound raw material, the sintering (combustion) time, It changes depending on the yield.
- the air permeability (pressure loss) of the sintering raw material charging layer is improved to shorten the sintering time, or the coldness of the sintered cake before crushing is reduced. It is effective to improve the yield by increasing the strength.
- Table 1 shows the chemical composition and average particle diameter of general iron ores A and B and magnetized fine powder raw materials such as magnetite fine iron ore, sintered ore, mill scale, and iron dust (blast furnace dust, steel dust, etc.).
- magnetized fine powder raw materials such as magnetite fine iron ore, sintered ore, mill scale, and iron dust (blast furnace dust, steel dust, etc.).
- the feature of these magnetized fine powder materials is that they usually contain more iron (FeO) than fine iron ore.
- the particle size of the magnetized fine powder raw material such as magnetite-based fine iron ore and iron dust is not as large as that of the pellet feed, but is finer than that of ordinary powdered iron ore for sintering, The air permeability in the sintering process is likely to deteriorate, which may reduce the productivity of the sintered ore.
- Patent Document 1 When using fine powder raw materials as sintering raw materials, efforts have been made to effectively use general fine iron ores. For example, in Patent Document 1, by adjusting the ratio of the fine iron ore and the core fine iron ore as described above at the blending stage, it is possible to obtain pseudo particles in which the fine ore is efficiently attached around the core. Have proposed a method of improving the granulation properties of the raw materials and suppressing the deterioration of air permeability.
- Patent Document 2 proposes a technique for producing a sintered blending raw material in which when fine ore is used, it is pulverized and stirred in a separate line, and a granulated property is improved by mixing a binder. Has been.
- an object of the present invention is to improve the sinterability by improving the air permeability of the sintered raw material charging layer when sintering the sintered blend raw material containing the magnetic fine powder raw material. It is to propose a method of operating the machine.
- the present invention has been developed in order to solve the above-mentioned problems when using a sintered blending raw material containing a large amount of magnetic fine powder raw materials that cause deterioration of the air permeability of the sintered raw material charging layer. That is, the present invention relates to a sintering machine operating method in which a sintering compound raw material is charged and sintered on a pallet of a sintering machine through a chute having a magnet disposed on the back surface.
- the blended raw material has 5 to 30 mass% of the raw material, the FeO content is 4.5 mass% or more, and the particle size is 0.2 to 2.5 mm in terms of arithmetic average diameter.
- the (F M 0) the sintered blended rate of the raw material [nu 1 in the chute the lower end of the absence, velocity [nu m of the deposition magnetic fine material in the chute lower end, 1 / 5 ⁇ 1 ⁇ 4 / 5 ⁇ and so that the speed of 1, adjust the magnetic force F M of the magnet
- Rukoto Rukoto.
- the amount of fine powder of 250 ⁇ m or less is 5 mass% or more by weight
- the velocity ⁇ m of the magnetized fine powder raw material at the lower end of the chute is 2 / 5 ⁇ 1 to 3 / 5 ⁇ 1
- the magnetic force F M of the magnet it is a numerical value determined by the following equation
- At least 5 to 15 mass% of the raw material for magnetized fine powder is sintered ore, and the remainder is at least one of magnetite fine iron ore, mill scale and iron dust. Consist of, Is a more preferable configuration.
- the sintering is performed. Since the magnetic fine powder raw material of the blended raw material can be selectively deposited (segregation charged) on the upper portion of the sintering raw material charging layer, the air permeability of the sintering raw material charging layer It becomes possible to suppress the deterioration of. As a result, it is possible to improve quality such as production rate, yield, and cold strength in the production of sintered ore.
- F M 0.01N
- the pressure loss in the sintered raw material charging layer deposited on the pallet is burned in the region where the loaded wet raw material is deposited (wet zone) and carbonaceous materials such as powdered coke. It occurs in the region where the sintering reaction of the sintering compound raw material is proceeding (reaction / melting zone), and in the region where the sintered ore exists after the sintering reaction is completed (sintering zone) It is known that there is not much loss. In order to improve the sinterability, it is important to reduce the pressure loss as a whole and improve the air permeability in the entire raw material charging layer.
- the sintered blending raw material includes a magnetic fine powder raw material such as magnetite-based fine iron ore that deteriorates air permeability due to a large amount of fine powder component
- the magnetic fine powder raw material is intentionally
- the sintering reaction can be completed early by depositing it on the upper part of the sintering raw material charging layer (segregation charging), and the deterioration of air permeability when a large amount of magnetic fine powder raw material is blended is minimized.
- FIG. 4 (a) shows the sintering process of the sintered blending raw material in the sintering raw material charging layer (hereinafter also simply referred to as “charging layer”) on the sintering machine pallet.
- b) shows the temperature distribution (heat pattern) in the sintering process in the charging layer
- FIG. 4 (c) shows the yield distribution of the sintered cake.
- the temperature of the upper layer portion of the charge layer of the sintered blending raw material is less likely to rise than the lower layer portion, and the high temperature region holding time tends to be relatively short. Therefore, in the upper layer portion of this charging layer, the combustion and melting reaction (sintering reaction) becomes insufficient, and the strength of the sintered cake is lowered. Therefore, as shown in FIG. This is a factor causing a decrease in productivity.
- a raw material magnetized fine powder raw material containing a larger amount of easily magnetized components such as FeO and fine powder in the sintered mixed raw material is blended. It has been found that this can be solved by performing so-called segregation charging, in which this raw material is selectively deposited on the upper layer of the charging layer when charging it onto the pallet.
- segregation charging in which this raw material is selectively deposited on the upper layer of the charging layer when charging it onto the pallet.
- the melting point liquidus temperature
- the upper part of the sintered raw material charging layer is segregated and charged with a magnetic fine powder material such as magnetite fine iron ore containing a large amount of FeO, the upper layer part is in a situation where the temperature is difficult to rise. Sintering reaction is promoted, and yield and strength can be improved.
- the charging layer which is a deposited layer of the sintered compounding material formed by charging the sintered compounding material on the pallet, is generally accompanied by particle size segregation due to percolation when sliding down on the chute.
- the upper layer and middle layer of the sintering raw material charging layer a large amount of fine sintered compounding material having a small particle size is distributed, while a coarse sintering compound material having a large particle size is deposited in the lower layer.
- segregation of the charging layer occurs.
- the segregation state becomes insufficient when more fine (more -260 ⁇ m) fine powder is contained, and in the present invention, a sintered blending raw material containing more of such a magnetic fine powder raw material is charged. Solve the problem when you do.
- the magnetite fine iron ore as shown in FIG. 2 that is, the content of FeO is high (4.5 to 60 mass%), and the particle size is 0.2 to 2.2.
- the premise is that a magnetically fine powder raw material having a size of 5 mm and a size of 250 ⁇ m or less is 60 mass% or less in cumulative weight ratio is used as a part of the sintered blending raw material. Then, this is a method for solving the above-mentioned problems when a sintered blending raw material containing 5 to 30 mass% of the magnetic fine powder raw material is charged onto a pallet using a chute as shown in FIG.
- the above-mentioned deposition structure is because when the sintered compounding raw material containing a large amount of magnetic fine powder raw material is charged onto the pallet by the chute, these raw materials are arranged on the back side of the chute. This is due to receiving the action of magnetic force by the permanent magnet or electromagnet. That is, for magnetic fine powder materials that are susceptible to magnetic force due to their high iron content and small particle size, the speed when sliding down on the chute is reduced, and as a result, non-magnetization that has low iron content and large particle size.
- the raw material (usually the sintering raw material) forms the lower layer first, while the magnetized fine powder raw material is delayed by the amount that the speed is reduced by the action of magnetic force. It is deposited on the upper layer of the charging layer.
- the content of FeO is less than 4.5 mass%, the magnetized fine powder material is hardly affected by the magnetic force of the magnet disposed on the back surface of the sloping chute, and the speed adjustment (reduction) effect is difficult to obtain.
- the upper limit of the FeO content can be changed by adjusting the magnetic force and is not particularly required, but the FeO content of the magnetically fine powder material is about 60 mass% at the maximum.
- the arithmetic average particle size of the magnetic fine powder material when the arithmetic average particle size of the magnetic fine powder material is 2.5 mm or more, the particle size difference from the non-magnetic material becomes small, and the magnetic fine powder material is placed on the upper layer of the charging layer. It is difficult to segregate well in the part.
- the arithmetic average diameter of the magnetized fine powder material is less than 0.2 mm, or when the ratio of particles having a particle size of 250 ⁇ m or less includes an integrated weight ratio of more than 60 mass%, the air permeability in the sintered bed is improved. Even if the magnetic fine powder raw material is deposited on the upper layer portion of the sintered raw material charging layer, the productivity of the sintering machine may be lowered.
- the amount of fine powder having a particle size of 250 ⁇ m or less is less than 5 mass%, the effect of the present invention is weakened.
- a preferable lower limit of the fine powder having a particle size of 250 ⁇ m or less is about 15 mass%.
- FIG. 6 is a diagram for explaining the movement of particles when a sintered blending raw material containing a large amount of magnetic fine powder raw material is charged through a chute having a magnet on the back surface.
- the force acting on the raw material particles has the particle motion direction component of gravity as (1)
- the frictional resistance due to magnetic force is (2) and the air resistance accompanying the motion of particles is (3)
- the equation of motion in the particle motion direction (chute horizontal plane direction) can be expressed as follows.
- the deposition magnetic fine material sliding down on the chute wherein the magnetic force F M by the magnet of the formula (1) and (2) can be organized more in the following manner. That is, in charging the sintered blended raw material containing the magnetic fine powder raw material, the content and particle size of the magnetic fine powder raw material, the blending ratio of the magnetic fine powder raw material are given, and the magnet and chute surface Distance ( ⁇ ), chute angle ( ⁇ ), chute length (L) are given, and as constants, gravitational acceleration (g), coefficient of friction between material and chute ( ⁇ ), resistance coefficient (Cp), air When the density ( ⁇ ) and the relative velocity (v) of the particles to the air are given, the equations of motion of the above formulas (1) and (2) can be arranged like the energy conservation formula of the following formula (3). .
- adjusting the resistance when the magnetized fine powder material that is easily magnetized slides down on the chute that is, suppressing the speed of the magnetized fine powder material in the sintered blended material
- adjustment of the magnetic force F M is performed based on the following criteria.
- preferable range of the magnetic force F M based on the speed difference between the magnetizable fine material and a non-magnetizable coarse-fine material in the chute bottom (speed ratio), magnetizable fine material on sintering pallet sintering It is preferable to adjust so as to segregate and deposit on the upper part of the raw material charging layer.
- equation (4) which is the energy conservation equation
- the velocity (initial velocity) at the position of dropping onto the chute is ⁇ 0
- the velocity when no magnetic force is applied at the lower end of the chute when was the (same as the non-magnetizable material velocity) [nu 1
- the speed [nu m of the deposition magnetic fine material in the chute lower end so as to be in the range of below to adjust the magnetic force F M.
- the FeO content of the magnetic fine powder material when charging the sintered blending raw material containing the predetermined amount (5 to 30 mass%) of the magnetic fine powder material described above onto the sintering pallet, the FeO content of the magnetic fine powder material, When the mass m and the magnetic susceptibility X change in consideration of the particle size and blending amount, the magnetic flux density (H) of the magnet to be used, the distance ⁇ between the chute surface and the magnet, and the chute angle are adjusted in advance, and then the chute (when shoots lower rate of non-magnetizable material is ⁇ 1, 1 / 5 ⁇ 1 ⁇ 4 / 5 ⁇ 1) within ⁇ magnetic fine material of slide off speed [nu m is constant in the lower portion so as to, wherein by adjusting the magnetic force F M by the magnet, it is possible to selectively deposit only the magnetizable fine raw material for sintering blended in the raw material at the top of the sintering raw material sintering bed on the pallet.
- FIG. 7 shows that the magnetic fine powder raw material in the sintered blending raw material contains FeO: 7.0 mass% sintered remineralization: 15 mass%, FeO: 4.7 mass% magnetite fine iron ore: 5 mass% , Shows a simulation result of charging with setting the magnetic force F M in formula (4) to 0.01 N, the speed of the magnetically fine powder material on the chute decreases, and most of it is burned. It is clear that it is deposited on the upper layer of the binder layer.
- FIG. 8 shows the magnetic fine powder raw material in the sintered blending raw material containing FeO: 7.0 mass% sintered reversion: 15 mass%, FeO: 4.7 mass% magnetite fine iron ore: 5 mass% those that, was simulated by setting the magnetic force F M in 0.01N than like, can not charging a sintering mixed material at a constant speed, an obstacle to operation of sintering machines.
- FIG. 9 shows the magnetic fine powder raw material in the sintered blending raw material containing FeO: 7.0 mass% sintered reversion: 15 mass%, FeO: 4.7 mass% magnetite fine iron ore: 5 mass% those that, it was simulated by setting the same way the magnetic force F M to 0.004 N, it is understood to be a desired polarization ⁇ input.
- FIG. 10 shows the magnetic fine powder raw material in the sintered blending raw material containing FeO: 7.0 mass% sintered reversion: 15 mass%, FeO: 4.7 mass% magnetite fine iron ore: 5 mass% those that illustrates an example of normal loading, the magnetic force F M: 0 was simulated by setting the it can be seen that polarization ⁇ input of magnetizability fines material can not be expected at all.
- the sintered blending material after charging was transferred to a sintering pot test apparatus, and a sintering experiment was conducted to investigate the influence on productivity and the like.
- the magnetic force (F M ) and the velocity ( ⁇ m ) in the lower layer of the chute in this example are 6.0 ⁇ 10 ⁇ 3 N under the conditions (T1 to T6) suitable for the present invention.
- the speed ⁇ m at this time was 3 / 5 ⁇ 1 .
- the magnetite fine iron ore is 10 mass%, the sintered return 20 mass%, and the remainder is powdered by a chute having a magnet arranged on the back surface.
- Magnetization of a sintered blending raw material blended with iron ore and limestone in a charging example (T6) suitable for the present invention and a comparative example (T8) that is a charging example using a chute in which no magnet is arranged When the segregation status of the component (FeO) was compared, in the invention example (T6) charged using a chute provided with a magnet, the sintered blending material containing the magnetized component was segregated in the upper layer of the charged layer. I was able to confirm.
- FIG. 13 shows the change in the production rate according to the blending ratio of the magnetite fine iron ore for the inventive example and the comparative example in this experiment.
- the condition (T2) in which the magnetic fine powder raw material is blended by 5 mass% has less magnetization components and the charging speed. Is not sufficiently obtained, and productivity in the sintering machine does not change much.
- the examples (T3 to T6) suitable for the present invention the effect of reducing the charging speed by the magnetic fine powder material is sufficiently obtained, and the productivity is improved as compared with the case (T1) not containing the magnetic fine powder material. To do.
- the technology according to the present invention has a larger particle size than that specified in the present invention, and there is a difference in effect even when charging a sintered blend raw material with a small amount or a large amount of magnetic fine powder raw material, Application is possible.
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Abstract
Description
(1)前記250μm以下の微粉の量が重量割合で5mass%以上であること、
(2)前記シュート下端部での前記着磁性微粉原料の速度νmは、2/5ν1~3/5ν1の速さであること、
(3)前記シュート下端部での前記着磁性微粉原料の速度νmは、前記磁石の磁力FMを0.0004~0.01Nの範囲内にして調整すること、
(4)前記磁石の磁力FMは、下記式によって求められる数値であること、
(5)前記着磁性微粉原料は、この原料のうちの少なくとも5~15mass%は焼結返鉱であって、残りがマグネタイト系微粉鉄鉱石、ミルスケールおよび製鉄ダストのうちのいずれか1種以上からなるものであること、
が、より好ましい構成である。
即ち、着磁性微粉原料を含む焼結配合原料の装入に当たって、該着磁性微粉原料のFeO含有量や粒径、この着磁性微粉原料の配合割合が与えられ、そして、磁石とシュート表面との距離(χ)およびシュート角度(θ)、シュート長さ(L)が与えられ、そして定数として、重力加速度(g)、原料とシュートとの摩擦係数(μ)、抵抗係数(Cp)、空気の密度(ρ)、粒子の空気に対する相対速度(v)が与えられるとき、上記式(1)、(2)の運動方程式は、下記(3)式のエネルギー保存式のように整理することができる。
この実施例における磁力(FM)とシュート下層部での速度(νm)は、表3に示すとおり、本発明に適合する条件(T1~T6)では、6.0×10-3N、およびこのときの速度νmは3/5ν1の条件であった。
Claims (6)
- 焼結配合原料を、背面に磁石を配設してなるシュートを介して焼結機のパレット上に装入して焼結する焼結機の操業方法において、
上記焼結配合原料は、この原料のうちの5~30mass%が、FeOの含有量が4.5mass%以上で、粒径が算術平均径で0.2~2.5mmの大きさを有し、かつそのうちには250μm以下の微粉の量が重量割合で60mass%以下である着磁性微粉原料であり、
この着磁性微粉原料をパレット上に装入するとき、該シュートに対して磁力(FM)を与えないとき(FM=0)のシュート下端部での前記焼結配合原料の速度をν1とするとき、該シュート下端部での前記着磁性微粉原料の速度νmが、1/5ν1~4/5ν1の速さとなるように、前記磁石の磁力FMを調整することを特徴とする焼結機の操業方法。 - 前記250μm以下の微粉の量が重量割合で5mass%以上であることを特徴とする請求項1に記載の焼結機の操業方法。
- 前記シュート下端部での前記着磁性微粉原料の速度νmは、2/5ν1~3/5ν1の速さであることを特徴とする請求項1または2に記載の焼結機の操業方法。
- 前記シュート下端部での前記着磁性微粉原料の速度νmは、前記磁石の磁力FMを0.0004~0.01Nの範囲内にして調整することを特徴とする請求項1~3のいずれか1に記載の焼結機の操業方法。
- 前記着磁性微粉原料は、この原料のうちの少なくとも5~15mass%は焼結返鉱であって、残りがマグネタイト系微粉鉄鉱石、ミルスケールおよび製鉄ダストのうちのいずれか1種以上からなるものであることを特徴とする請求項1~5のいずれか1に記載の焼結機の操業方法。
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BR112017008572-0A BR112017008572B1 (pt) | 2014-10-31 | 2015-10-26 | Método para operar máquina de sinterização |
KR1020177011349A KR101925365B1 (ko) | 2014-10-31 | 2015-10-26 | 소결기의 조업 방법 |
CN201580060005.6A CN107002165A (zh) | 2014-10-31 | 2015-10-26 | 烧结机的操作方法 |
PH12017500701A PH12017500701B1 (en) | 2014-10-31 | 2017-04-12 | Method for operating sintering machine |
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JPH09302422A (ja) * | 1995-12-22 | 1997-11-25 | Kawasaki Steel Corp | 磁力を用いた焼結原料の装入方法 |
JP2003105449A (ja) * | 2001-09-26 | 2003-04-09 | Kawasaki Steel Corp | 焼結原料の装入方法および装入装置 |
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JPH09302422A (ja) * | 1995-12-22 | 1997-11-25 | Kawasaki Steel Corp | 磁力を用いた焼結原料の装入方法 |
JP2003105449A (ja) * | 2001-09-26 | 2003-04-09 | Kawasaki Steel Corp | 焼結原料の装入方法および装入装置 |
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JP2015193898A (ja) * | 2014-03-26 | 2015-11-05 | Jfeスチール株式会社 | 着磁成分原料を含有する焼結配合原料の装入方法 |
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