KR20160079240A - sintering apparatus and method for manufacturing sintered ore of using it - Google Patents

sintering apparatus and method for manufacturing sintered ore of using it Download PDF

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KR20160079240A
KR20160079240A KR1020140190333A KR20140190333A KR20160079240A KR 20160079240 A KR20160079240 A KR 20160079240A KR 1020140190333 A KR1020140190333 A KR 1020140190333A KR 20140190333 A KR20140190333 A KR 20140190333A KR 20160079240 A KR20160079240 A KR 20160079240A
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South Korea
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sintering
raw material
ventilation member
lower layer
layer portion
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KR1020140190333A
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Korean (ko)
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김성완
나지훈
서정일
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주식회사 포스코
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Priority to KR1020140190333A priority Critical patent/KR20160079240A/en
Publication of KR20160079240A publication Critical patent/KR20160079240A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention relates to a sintering apparatus and a sintered ore manufacturing method. The sintering apparatus includes: multiple sintering trolleys having sintering mixture raw materials inserted therein; an ignition path which sprays flames to a raw material layer in the sintering trolleys; and an air gap forming unit which is arranged between the location of inserting the sintering mixture raw materials and the ignition path and includes an air ventilation member which can be inserted into or discharged from a lower layer unit in a direction parallel to the traveling direction of the sintering trolleys when the raw material layer is separated into an upper layer unit, an intermediate layer unit, and the lower layer unit. The air ventilation member is inserted into the lower layer unit to make the volume share of the air ventilation member in a range between 0 and 1.48 vol% with respect to 100 volume of the lower layer unit. Then, the mixture of the sintering mixture raw materials are inserted therein to be sintered, thereby enhancing air permeability of the sintering layer, enhancing sintering productivity, and improving the quality of the sintered ore.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintering apparatus,

More particularly, the present invention relates to a sintering apparatus capable of improving sintering productivity and improving the quality of sintered ores by improving the air permeability of the sintered layer and a method of manufacturing sintered ores using the sintering apparatus.

Dwight-Lyoid sintering process, which is capable of mass production, is mainly used in the process of producing sintered ores, which is generally manufactured to a size suitable for use in a furnace by sintering fine-particle iron ores. In this type of DL sintering process, mixing and humidity (raw material weight ratio of about 7 ~ 8%) is put into a drum mixer, and sintering raw material is made into pseudo-particles by adding minute iron ore, subsidiary raw material and fuel (minute coke and anthracite) To a predetermined height. Then, after ignition of the surface by the ignition furnace, air is forcedly sucked from below, and sintering of the sintering blend material proceeds to produce sintered ores. After sintering, the sintered ore is cooled to a cooler through a crusher of the light pipe, is classified into granules (5 ~ 50㎜) easy to be charged and reacted in the blast furnace and transferred to the blast furnace, The spectra are classified as semi-luminous and reused as raw materials for sintering.

Since the DL type sintering process is a downward sucking process, the moisture evaporated in the upper layer during the sintering process moves to the lower layer, cooling the lower sintering raw material at a lower temperature, and condensing moisture on the solid side. That is, the hot gas passing through the coke reaction layer during the sintering process heats the lower raw material layer and evaporates water to contain a large amount of steam in the gas. And the hot gas is moved to the low temperature region of the lower portion to condense the water on the solid side to flow and coagulate the pseudo-particles in the raw material layer of the sinter, thereby collapsing the raw material filling state, thereby reducing the attack rate in the layer, I have a problem.

In addition, an increase in the amount of low-cost ore ore used in reducing the cost of charcoal production causes an increase in water content in the layer due to crystal water dissociation during the sintering process and an increase in the amount of condensed water in the wetting zone under the sintering layer. This causes collapse of pseudo-particles of the lower layer raw material layer, uneven flow of the intake air, and firing.

As described above, the reduction of the air permeability in the sintered layer due to the increase of the air flow resistance, the uneven flow of the intake air, and the occurrence of the sintering irregularity cause the sintering productivity to decrease. Therefore, it is required to ensure air permeability so that a proper amount of air can flow in the layer in order to efficiently advance the sintering reaction and to produce sintered ores of good quality.

Conventionally, attempts to improve air permeability have been made to reduce air permeation resistance in a raw material layer by strengthening pre-treatment of raw materials such as promotion of intoxication and improvement of pseudo-particle strength. That is, by adding a binder such as burnt lime to increase the interfacial resistance in the raw material layer and thereby improve sintering productivity by promoting the intrusion of raw materials for sintering and improving the bonding strength of the pseudo-particles to improve the air permeability of the sintered layer and the combustibility of the partial coke .

However, such a method requires the use of an additive such as burnt lime, which causes a problem that the use of burnt lime is limited, and the cost for producing the sintered ores is increased by the continuous burnt lime injection.

JP 2011-252203 A JP 2012-112003 A

The present invention provides a sintering apparatus capable of improving the sintering productivity and quality by improving the air permeability of a raw material layer in a sintering vehicle, and a method of manufacturing sintered ores using the sintering apparatus.

The present invention provides a sintering apparatus capable of preventing the use of a binder including burnt lime and preventing an increase in the cost of producing sintered ores, and a method for producing sintered ores using the same.

The present invention provides a sintering apparatus capable of increasing the productivity and efficiency of the sintering process, and a method of manufacturing sintered ores using the same.

The sintering apparatus according to an embodiment of the present invention includes a plurality of sintering bogies into which a sintering blend material is charged, an ignition furnace that injects a flame into a raw material layer in the sintering bogie, and a position where the sintering blend material is charged, And an air gap forming portion provided between the lower layer portion and the lower layer portion in a direction parallel to the moving direction of the sintered bogie when the raw material layer is divided into the upper layer portion, the middle layer portion and the lower layer portion from above, The volume occupancy rate of the ventilation member in the lower layer portion with respect to the entire region may be more than 0% and 1.48% by volume.

Wherein the air gap forming portion includes a support portion disposed to be spaced apart from the sidewall of the sintering bogie in a direction crossing the movement direction, a drive shaft connected to the support portion and extending in the vertical direction and having one end connected to the airflow member, And a driver connected to the other end to reciprocate the drive shaft in a direction parallel to the movement direction of the sintered bogie.

The volume occupancy rate of the ventilation member in the lower layer region may be 0.8 to 1.0% by volume.

The average diameter of the ventilation member may be 10 to 20 mm.

A method of manufacturing an sintered light according to an exemplary embodiment of the present invention includes the steps of inserting a vent member into a sintering bogie in which a sintering material mixture is sintered, and sintering the sintering blend material mixture in the sintering bogie, Wherein the step of inserting the ventilation member into the sintering vehicle includes the steps of inserting the ventilation member into the lower layer portion when dividing the raw material layer formed by the sintering blend raw material mixture into the upper layer portion, The volume occupancy rate of the ventilation member in the lower layer portion with respect to the entire region of the lower layer portion is more than 0% and 1.48% by volume.

The volume occupancy rate of the ventilation member in the lower layer region may be 0.8 to 1.0% by volume.

The ventilation member may be inserted and installed within a height range of 30 to 65% based on the total height of the lower layer portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a plant for producing sintered ores using a sintering apparatus according to an embodiment of the present invention; FIG.
2 is a cross-sectional view showing a sintering apparatus according to an embodiment of the present invention.
3 is a view for explaining an operating state in a sintered bogie of an air gap forming portion according to an embodiment of the present invention.
4 is a view for explaining an arrangement state of a cavity forming portion in a sintering carriage according to an embodiment of the present invention.
5 is a flowchart sequentially illustrating the method for producing sintered ores according to an embodiment of the present invention.
6 is a cross-sectional view schematically showing a configuration of a sintering port testing apparatus for implementing an embodiment of the present invention.
FIG. 7 is a graph showing the temperature change of the sintering exhaust gas according to sintering time in the sintering port test according to the embodiment of the present invention.
8 is a graph showing a change in flow rate of a sintering exhaust gas according to sintering time in a sintering port test according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

Hereinafter, a sintering apparatus according to an embodiment of the present invention and a method of manufacturing a sintered ores using the same will be described with reference to FIGS. 1 to 8. FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a plant for producing sintered ores using a sintering apparatus according to an embodiment of the present invention; FIG. 2 is a cross-sectional view showing a sintering apparatus according to an embodiment of the present invention. 3 is a view for explaining an operating state in a sintered bogie of an air gap forming portion according to an embodiment of the present invention. 4 is a view for explaining an arrangement state of a cavity forming portion in a sintering carriage according to an embodiment of the present invention. 5 is a flowchart sequentially illustrating the method for producing sintered ores according to an embodiment of the present invention. 6 is a cross-sectional view schematically showing a configuration of a sintering port testing apparatus for implementing an embodiment of the present invention. FIG. 7 is a graph showing the temperature change of the sintering exhaust gas according to sintering time in the sintering port test according to the embodiment of the present invention. 8 is a graph showing a change in flow rate of a sintering exhaust gas according to sintering time in a sintering port test according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus for producing an sintered ore is manufactured by supplying a plurality of sintering blend materials S from respective storage bins (not shown), adding moisture in the drum mixer 100, ) As a pseudo-particle, and charging the sintering apparatus 300 to perform sintering.

Here, the sintering apparatus 300 according to the embodiment of the present invention improves the air permeability of the raw material layer by forming the ventilation gap P in the lower layer portion of the raw material layer formed by the sintering raw material charged into the sintering bogie 350 The sintering apparatus 300 includes a plurality of sintering bogies 350 in which a sintering material is charged and a plurality of sintering bogies 350, An ignition furnace 330 for injecting a flame into the raw material layer formed by the sintering material and a sintering bogie 350 for supplying the raw material layer to the upper layer H T), the intermediate part (H M) and to separate a lower layer portion (H B), the void having a lower layer portion (the vent member 371 can saptal to H B) in a direction parallel to the moving direction of sintering balance 350 forming section (370). At this time, the ventilation member 371 of the cavity forming portion 370 may be disposed in the sintering bogie 350 so that the volume occupancy rate at the lower layer portion is greater than 0 to 1.48% by volume based on the entire lower layer portion. That is, in the sintering apparatus 300 of the present invention, when the total area of the lower layer portion of the raw material layer in the sintered bogie 350 is 100, the ventilation member 371 in the lower layer portion has a volume occupancy The use of the ventilation member 371 having a volume occupancy rate in the lower layer portion improves the ventilation of the raw material layer in the sintered bogie 350, thereby realizing an increase in sintering productivity and an increase in quality.

The sintering blend material refers to a blend material provided from a surge hopper 310 excluding an upper light provided from an upper light hopper (not shown), and after the upper light and the blend material are charged in the sintering carriage 350, do.

An upper light hopper (not shown) is provided at an upper portion of one side of the upper movement path of the sintering bogie 350, and the upper light is charged in order to prevent the sintering raw material formed at the bottom of the sintering bogie 350 from flowing out . The upper light means that sintered ores having a particle size of about 8 to 15 mm are selected from among the sintered ores.

The surge hopper 310 is provided in front of the upper light hopper, that is, the movement path of the sintering bogie 350, and charges the sintering raw material for producing the sintered light into the sintering bogie. The surge hopper 310 uniformly loads the sintered raw material in the width direction of the sintered bogie without segregation and segregation in the depth direction of the sintered bogie 350 so as to reduce the grain size from the bottom to the top .

The ignition furnace 330 is provided in front of the surge hopper 310 to supply a sintering raw material to the sintering bogie 350 and supply a flame to the surface layer of the raw material layer to be ignited.

The sintering bogie 350 is provided with a lower surface 351 and a side surface 355 for providing a space for forming a raw material layer by loading the upper light and the raw material for sintering. It is open. As shown in FIG. 3, the sintering bogie 350 of the present invention may be provided with a ventilation member 371 through which at least part of the raw material layer can be inserted and removed.

Here, if explanation about the material layer (H S) in the sintered balance 350, the raw material layer (H S) when the upper beam and the blended raw material be charged to sinter the balance 350, the total height of the material layer (H S) lower layer (H B) to the area of half the height from the bottom relative to the 60 to 65% from the top of the lower layer portion (H B) of the areas other than the lower layer portion (H B) in the total height of the material layer (HS) Region is defined as an upper layer portion (H T ) from the upper portion of the middle layer portion (H M ) and the middle layer portion (H M ) to the upper portion of the raw material layer (H S ).

The cavity forming portion 370 is provided with a ventilation member 371 that is removably provided in the lower layer portion H B of the raw material layer H S and is provided for forming a vent hole P in the lower layer portion H B do. The gap forming portion 370 includes a support portion 375 disposed to be spaced apart from a side surface of the sintering bogie 350 in the direction intersecting the movement direction of the sintering bogie 350 and a support portion 375 connected to the support portion 375, And includes a drive shaft 373 whose one end is connected to the ventilation member and a driver 377 which is connected to the other end of the drive shaft to reciprocate the drive shaft in the direction parallel to the moving direction of the sintering carriage and in the vertical direction do.

The support portion 375 is formed as a column extending in a predetermined length and is disposed so as to be spaced apart from the sintered bogie 350 in the width direction of the sintered bogie 350 in the movement path of the sintered bogie 350. One end of the support part 375 is supported by a structure existing at a place where the existing sintering device is installed and the other end is formed by extending a predetermined length in the depth direction of the sintering bogie 350 and disposed at a position higher than the upper end of the sintering bogie 350 have. More specifically, assuming that the length of the support portion 375 is H, the sintering bogie 350 may be formed to have a length of 30 to 40% of H. The width of the support 375 spaced apart from the sintering bogie 350 may be spaced 15 to 25% apart from the width of the sintering bogie 350 in the width direction.

The vent member 371 is disposed inside the sintered bogie 350 and is disposed in a partial area of the lower layer portion H B of the inner space formed by the sintered bogie 350. That is, the ventilation member 371 may be formed in the form of a bar extending in one direction, and the extended one direction may be disposed inside the sintering bogie 350 in a direction parallel to the moving direction of the sintering bogie 350 , the vent member 371 may be disposed at a position spaced from the bottom surface inside of the sintered balance 350 is at the position of the upper portion than the region where the upper light occupied in lower layer portion (H B), based on the total height of the lower layer portion (H B) . Furthermore, the ventilation member 371 can be disposed in the sintering bogie 350 within a range of 30 to 65% based on the total height of the lower layer portion H B. This is because the compounding materials accumulated in the upper light phase occupying a part of the lower layer portion H B of the raw material layer H S form wetting bars containing the greatest amount of water while the sintering process proceeds, The raw material charged from the upper portion of the sintered bogie 250 is excluded from the region where the aeration member 371 is disposed to form a gap so that condensed water condensed in the raw material can be discharged.

At this time, the extension length of the ventilation member 371 is equal to or larger than the width of the sintering carriage 350 in the direction parallel to the moving direction of the sintering carriage 350, And to extend the load of the compounding materials.

Vent in the vent member 371 may be arranged in the material layer lower layer (H B) sintering the balance 350, the volume share so as to have a greater than 0 to about 1.48% by volume in the (H S), lower part (H B) The volume occupancy rate of the member 371 can be adjusted by the number of the ventilation member 371 disposed in the sintering bogie 350 and the average diameter of the ventilation member 371. That is, the average diameter and the number of the ventilation members 371 can be adjusted so that the volume occupancy of the ventilation member 371 in the lower layer portion H B has a value within the range of more than 0 to 1.48 volume%.

At this time, when the volume occupation rate of the ventilation member 371 in the lower layer portion H B is 0 vol% or less, voids due to the ventilation member 371 are not formed in the lower layer portion H B , effect of lower layer (H B) can not be obtained an effect of increasing the permeability of the resulting raw material layer by forming an air gap, if the volume share of the lower layer portion vent member 371 in the (H B) exceeds 1.48% by volume is A large air gap is formed in the lower layer portion HB, so that the in-bed drift of the raw material layer combustion gas through the air gap is intensified, and the problem is that the sintered light intensity and the recovery rate are lowered due to non-uniform firing. Therefore, the volume occupancy rate of the ventilation member 371 in the lower layer portion H B can be set to satisfy the above-described range of more than 0 to 1.48% by volume. On the other hand, more preferably, the volume occupancy rate of the ventilation member 371 in the lower layer portion H B may have a value within a range of 0.8 to 1.0% by volume. When the volume occupancy of the ventilation member 371 in the lower layer portion H B has a value within the range of 0.8 to 1.0% by volume, the productivity of the sintered ores is the most increased value based on the volume occupancy rate range, ), The effect of the most increased sintering process can be obtained. This is supported by the sintering port test result for implementing the embodiment of the present invention to be described below.

On the other hand, the average diameter of the ventilation member 371 can be selected within a range of 10 to 20 mm. At this time, when the average diameter of the ventilation member 371 is less than 10 mm, a plurality of ventilation members 371 are sintered so as to satisfy the volume occupancy rate range of the ventilation member 371 in the lower layer portion H B The number of the insertion holes 355a formed in the sintered bogie 350 is increased, and thus the stability of the apparatus may be reduced. When the average diameter of the ventilation member 371 is greater than 20 mm, the size of the air gap formed by one ventilation member 371 in the lower layer portion H B becomes too large, When the vent member 371 is excluded from the inside of the sintered bogie 350 after the sintering material and the upper light are charged, the material may collapse due to the air gap formed by the vent member 371, . Therefore, even if the value in the volume occupancy rate range of the ventilation member 371 in the lower layer portion H B satisfies the value, the ventilation member 371 becomes large due to the large average diameter of the ventilation member 371 after being separated from the lower layer portion H B There is a possibility that the effect of the void formation according to the present invention can not be obtained due to the filling of the raw materials between the pores formed. Therefore, the average diameter of the ventilation member 371 can be selected and used from 10 to 20 mm.

The driving shaft 373 extends vertically and has one end connected to one end of the ventilation member 371 and reciprocable by the power transmitted from the actuator 375 in the moving direction and the vertical direction of the sintering carriage 350 Respectively. Of the driving shaft 373 is being provided to reciprocate in the direction of movement and parallel to the direction of the sintered balance 350, the vent member 371 that can be further advanced toward the moving direction of sintering the balance 350, lower layer (H B) The pores can be formed more easily. The drive shaft 373 is vertically reciprocatable so that after the gap is formed in the raw material layer in the sintered bogie 350, the aeration member 371 can be stably moved to the outside of the sintered bogie 350 .

The drive unit 375 may be connected to the other end of the drive shaft 373 and used to provide power to move the drive shaft 373 up and down and in a direction parallel to the direction of movement of the sintered bogie 350 .

The air gap forming unit 370 formed as described above allows the ventilation member 371 to be placed in the sintering bogie 350 by the action of the drive shaft 373 in the sintering bogie 350 before the upper light and the sintering blend material are charged into the sintering bogie 350. [ And the upper light and the sintering compound material are charged into the region excluding the region where the vent member 371 is disposed, so that void formation can proceed.

As described above, the sintering apparatus 300 according to the embodiment of the present invention easily attaches the ventilation member 371 to the lower layer portion H B of the raw material layer in the sintering bogie 350 based on the total height of the sintering bogie 350 And the volume occupancy rate of the ventilation member 371 at the lower layer portion HB can be adjusted to have a value within the range of more than 0 to 1.48 volume percent so that the air permeability of the raw material layer can be controlled by the air gap formed in the lower layer portion H B .

Hereinafter, with reference to FIG. 6, a method for manufacturing sintered ores according to an embodiment of the present invention will be described.

The method for producing sintered ores according to the embodiment of the present invention is a method for producing sintered ores by increasing the air permeability of the raw material layer by controlling the volume occupancy of the aeration member 371 in the lower layer portion H B of the raw material layer H S , A step of inserting a ventilation member (371) into a sintering bogie (350) where sintering of the blending material mixture is performed, and a step of charging and sintering the sintering blend material mixture in the sintering bogie, The raw material layer H S formed by the sintering material mixture in the sintering bobbin 350 is divided into the upper layer portion H T , the middle layer portion H M and the lower layer portion H B The ventilation member 371 may be inserted into the lower layer portion H B so that the occupancy rate of volume in the lower layer region of the ventilation member 371 is more than 0 to 1.48% by volume.

The method for producing sintered ores according to an embodiment of the present invention will be described in more detail as follows.

 First, sintering raw materials composed of iron ore, additives, semi-light, fuel, etc. are prepared (S100). Here, iron ores include hematite, galena, and magnetite, and at least one of them may be used. In this case, the process of preparing the raw material for sintering may further include a step of selecting the particle size of the iron ore. When the sintering raw material is prepared as described above, the iron ore, additives, collimation, and fuels are mixed with each other in the primary dream mixer and granulated to form pseudoparticles. At this time, in the primary drum mixer, water can be mixed to mix the raw materials, and the water content of the mixed raw materials can be maintained, for example, about 7 to 8% by weight.

Thereafter, the ventilation member 371 is disposed in the sintering bogie 350 before charging the mixture for producing the sintered ores. That is, the mixture for producing sintered ores is charged into the sintering bogie 350 to form the raw material layer H S , and the raw material layer HS has a lower layer portion H B and a lower layer portion H B) the middle portion a predetermined area of the upper portion of (time be divided from the upper part of the H M) and the intermediate part (H M) in the upper part (H T) to the top of the material layer (H S), lower part (H B) And the aeration member 371 is disposed in the sintering bogie 350 (S200). That is, the drive shaft 373 is moved in the lateral direction of the sintering bogie 350, and the aeration member 371 connected to the drive shaft 373 can be disposed inside the sintering bogie 350 in the lateral direction.

Then, the upper light and the sintering blend material mixture are charged into the sintering bogie 350 by free fall from the upper portion of the sintering bogie 350 in a state where the aeration member 371 in the sintering bogie 350 is disposed, The volume occupancy X of the ventilation member 371 in the lower layer portion H B of the raw material layer formed in the cavity 350 is set to a value within the range of more than 0 to 1.48 volume% (S300). More preferably, the volume occupancy X of the ventilation member 371 in the lower layer portion HB is set to a value within the range of 0.8 to 1.0% by volume. That is, the value of the volume occupancy rate of the lower layer portion HB of the ventilation member 371 as described above is formed in the raw material layer formed by the ventilation member 371 when the raw material layer is formed and then escaped from the inside of the sintering carriage 350 The moisture evaporated from the upper layer during the sintering process from the cavity formed by the ventilation member 371 is cooled in the lower layer portion and the condensed moisture can be discharged through the air gap, Can solve the problem of collapsing the raw material filling state and reducing the attack rate in the layer.

When the sintering blend material mixture is loaded and the raw material layer is formed in a state where the aeration member 371 in the sintering bogie 350 is installed, the aeration member 371 is pulled out from the inside of the sintering bogie 350. That is, the ventilation member 371 is moved to the position outside the sintered bogie 350 or the side of the sintering bogie 350 so that the ventilation member 371 is not disposed inside the raw material layer HS, The ventilation member 371 is not disposed in the area overlapping with the ventilation member 371 and a gap is formed in the lower layer portion HB of the raw material layer HS by the movement of the ventilation member 371. [

The upper portion of the raw material layer HS is ignited by the ignition path 330 on the sintered bogie 350 in the state where the air gap is formed in the lower layer portion HB of the raw material layer HS by the ventilation member 371, And the sintered ores can be manufactured (S400).

Hereinafter, with reference to FIG. 7 to FIG. 9, the sintering pot test for realizing the sintering apparatus according to the embodiment of the present invention shows the effect of improving the sintering productivity and quality when the sintering apparatus is manufactured using the sintering apparatus of the present invention I want to confirm.

 7 is a cross-sectional view schematically showing a configuration of a sintering port test apparatus for implementing an embodiment of the present invention. 8 is a graph showing changes in sintering temperature of the sintered exhaust gas according to sintering time in the sintering port test according to the embodiment of the present invention. 9 is a graph showing a change in flow rate of a sintering exhaust gas according to sintering time in a sintering port test according to an embodiment of the present invention.

[Chemical composition of sintering raw material and iron ore and condition of particle size]

The conditions of the sintering raw material to be used for the sintering port test for implementing the embodiment of the present invention are shown in Table 1 below and the chemical compositions and particle sizes of the iron ores used in the present invention are shown in Table 2 below .

(A, B, C, and F) and two kinds of iron ore (D, E) were mixed with the iron (Fe) And 13.4% by weight of limestone, 2.4% by weight of burnt lime and 0.3% by weight of silica sand were used as additives. (The blending ratios shown in Table 1 below are rounded off to the second decimal place, so errors may occur in the sum.)

division Mixing condition Particle size (mm) Iron ore (wt%)




A 6.7 -8 B 11.6 -8 C 8.3 -8 D 28.8 -8 E 15.9 -8 F 12.6 -8 Additive (wt%)

quicklime 2.4 -One Limestone 13.4 -4 Silica sand 0.3 -One Sum of ingredients (wt%) 100.0 Extrapolation (wt%)

Reflection 19.6 -5 Minute coke 2.2 -3 hard coal 2.2 -3 Total (wt%) 124 Goal composition




CaO (%) 9.8




SiO2 (%) 5.5 MgO (%) 0.6 Al2O3 (%) 1.7 Slag Vol. 17.6 basicity 1.78

ironstone
Chemical composition (wt%) Granularity T.Fe FeO SiO2 Al2O3 CaO MgO Average particle diameter
(Mm) Differential (-0.15 mm)
ratio A 61.53 0.08 3.94 2.12 0.04 0.04 2.33 22.3 B 65.15 0.96 3.94 0.82 0.00 0.01 2.07 26.5 C 61.65 0.07 3.51 2.06 0.01 0.04 2.31 38.1 D 58.15 0.07 5.29 1.42 0.04 0.04 2.86 6.0 E 58.70 0.22 4.49 1.51 0.05 0.05 2.68 5.3 F 65.55 0.24 1.62 1.57 1.72 0.17 1.55 20.7

Table 1 shows mixing conditions of the sintering blend materials used in the examples of the present invention and the conventional sintering blades according to the present invention. Various kinds of iron ores and additives are mixed to prepare a total of blending ingredients of 100 wt% , And extrapolating fuel such as semi-coke, minute coke, and anthracite to provide a total of 124 wt% of the sintering blend material mixture. Then, the target component of the sintered ores of the mixture of the sintering and blending raw materials was kept at 1.7% by weight of Al 2 O 3 , 17.6% by weight of slag and 1.78% of basicity so as to be similar to the actual manufactured sintered ores.

[Manufacture of sintered ores]

The sintered ores were prepared using the sintering raw materials shown in Table 1 above. At this time, iron ore composed of fine particles was assembled into briquettes using the above blend to prepare sintered ores.

The raw materials for sintering composed of iron ore, additives, semi-coke and anthracite as a fuel were mixed with water in a primary drum mixer so as to have a water content ratio of 7 to 8% for 2 minutes to prepare pseudoparticles. And mixed in a drum drum mixer for 2 minutes to prepare a mixture for producing the sintered ores.

[Sintering Port Test]

Referring to FIG. 7, the sintering port tester includes a sintering port 10 to which a mixture for producing sintered ores is charged, a windbox (not shown) provided at a lower portion of the sintering port 10, And an igniter (not shown). At this time, the bottom of the sintering port 10 may be formed with a griddle (not shown) such as a lattice or a matrix to communicate with the windbox. A venting bar insertion port (not shown) is arranged at a height of 150 mm (one stage), 300 mm (two stages) from the bottom surface of the sintering port 10 so that the ventilation member 371 can be inserted into the sidewall of the sintering port 10, 450 mm (three stages), 600 mm (four stages) and 750 mm (five stages) so that the vent member 371 can be inserted according to the stages.

When the raw material layer is formed in the sintered pot 10, a region within a half point from the bottom based on the total height of the sintered pot 10 for forming a gap in the lower layer portion of the raw material layer, more specifically, A ventilation member 371 is disposed within a height range of 30 to 65% based on the total height of the half area, and the sintering raw material is charged. At this time, the air hole ratio of the ventilation member 371 occupying the lower portion of the raw material layer in the sintered pot 10 was changed from more than 0 to 1.48% by volume.

After completion of charging, the ignition furnace preheated to 1050 ℃ was moved to the upper part of the sintering port and ignited for 1 minute. Then, sintering was carried out at a negative pressure of 1,700 mmAq and the productivity and quality were investigated. The productivity, recovery, rotation strength, low temperature reduction fraction (RDI) and reduction index of the produced sintered ores were determined by the following formulas (1) to (5), and the sintering time was such that the sintering exhaust gas reached the maximum temperature Of the time.

Figure pat00001

Figure pat00002

Figure pat00003

Figure pat00004

Figure pat00005

Table 3 shows changes in the sintering port test according to changes in the air hole ratio of the lower layer of the sintering raw material layer according to the embodiment of the present invention.

division Conventional The present invention (using a ventilation member) Comparative Example 1 Example 1 Example 2 Example 3 Height of sintered raw material layer (mm) 900 900 900 900

Vent member
Terms of Use Insertion height (mm) - 300 300 300 Diameter (mm) - 10 15 20 Quantity () - 5 5 5 Vent hole ratio
(volume%) - 0.36 0.84 1.48

small
texture
Special
castle

Loading density (ton / ㎥) 2.05 2.01 2.00 1.99 Sintering time (min) 46.4 41.9 39.8 39.2 Productivity (ton / day / ㎡) 28.7 29.8 33.3 31.2 Rotational strength (%) 73.1 72.1 72.5 72.2 Recovery rate (%) 71.0 70.4 69.7 64.6 Low Temperature Reduction Differentiation Index (%) 41.9 42.4 41.3 43.9 Reduction rate (%) 74.8 76.6 76.1 78.3

According to the above Table 3, since the use of the ventilation member as in the embodiment of the present invention is not performed, the ventilation gap by the ventilation member is not formed in the sintering raw material layer (reference) 1 to 3 show a state in which a ventilation member is disposed in a lower layer of the sintering raw material layer so that a ventilation space due to the ventilation member is formed in the sintering raw material layer.

[Comparative Example 1]

According to the comparative example 1, since the ventilation member for forming the ventilation gap was not used under the condition of the height of the sintering raw material layer of 900 mm, the charging density of the sintering raw material layer in the comparative example 1 was 2.05 ton / , The productivity is 28.7 tons / day / ㎡, the rotation strength is 73.1%, the recovery rate is 71.0%, the low temperature differential index is 41.9% and the reduction rate is 74.8%.

[Examples 1 to 3]

Referring to Examples 1 to 3, a ventilation member for forming a ventilation gap is formed in a lower layer of the sintering raw material layer under the condition of 900 mm height of the sintering raw material layer, as in Comparative Example 1. Thus, in Examples 1 to 3, the charging density (2.05 ton / m3 → 1.99 to 2.01 ton / m3) of the sintering raw material layer decreased and the sintering time (46.4 min → 39.2 to 41.9 min ) And the sintering productivity (28.7 ton / day / ㎡ → 29.8 ~ 33.3 ton / day / ㎡) was increased. This is because, as shown in the graphs of Figs. 8 and 9, since the ventilation gap is formed in the lower layer portion of the sintering raw material layer, the condensed water is smoothly supplied through the ventilation gap in the wet zone of the middle layer of the sintering raw material layer during the sintering process The moisture content of the sintered flue gas is reduced and the porosity of the sintered flue gas is increased to improve the air permeability of the sintered layer so that the temperature of the sintered flue gas in the raw material layer reaches a maximum temperature in a shorter time than in the prior art, It is possible to increase the productivity of the sintered ores by reaching the maximum flow velocity in a shorter time than in the prior art.

Further, as the ventilation gap is formed in the lower layer portion by the vent member, the sintering light source exponent increases from 74.8% to 78.3% of the comparative example because of improved air permeability of the raw material layer, This is because the amount of micro-machining and needle-shaped calcium ferrite that is advantageous for reduction is increased.

On the other hand, it can be seen that Example 2 showing 0.84% by volume of the air hole ratio due to the use of aeration member formed by each of Examples 1 to 3 has increased sintering productivity compared to Examples 1 and 3, This is because as the air gap ratio increases, the charging density and sintering time of the raw material layer are reduced, but the sintering productivity is reduced because the recovery rate of the sintered ores is lowered. That is, if the air hole ratio of the raw material layer exceeds a certain level, the in-bed drift of the combustion gas through the air gap is intensified and the strength of the sintered light and the recovery rate are reduced by non-uniform firing. This is the reason why the productivity of the sintered ores is lower than that of Example 2 even though the sintered pores have an increased volume percentage.

Therefore, if the volume occupied by the vent member exceeds 0% by volume, the sintered product exhibits increased sintering productivity in the conventional sintered light production process without the vent member, but the volume occupied by the vent member in the lower layer continues to increase The productivity of the sintered ores is increased and then decreased. Thus, the volume occupancy of the ventilation member in the lower layer portion may be set to be 0.8 to 1.0% by volume.

Table 4 shows the results of the sintering port test in which the air hole porosity ratio, in which the increase in the air permeability of the raw material layer is maximized according to the test results in [Table 3], changes with the height of the sintering raw material layer.

division Conventional The present invention (using a ventilation member) Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 2 Example 4 Example 5 Height of sintered raw material layer (mm) 900 800 1000 900 800 1000

Vent member
Terms of Use Insertion height (mm) - - - 300 300 300 Diameter (mm) - - - 15 15 15 Quantity () - - - 5 5 5 Vent hole ratio
(volume%) - - - 0.84 0.84 0.84
small
texture
Special
castle

Loading density (ton / ㎥) 2.05 2.06 2.05 2.00 2.00 2.01 Sintering time (min) 46.4 39.4 54.6 39.8 39.8 46.2 Productivity (ton / day / ㎡) 28.7 29.3 27.3 33.3 33.3 31.4 Rotational strength (%) 73.1 72.3 73.1 72.5 72.5 72.9 Recovery rate (%) 71.0 67.1 69.8 69.7 69.7 67.9 Low Temperature Reduction Differentiation Index (%) 41.9 41.5 43.8 41.3 41.3 41.1 Reduction rate (%) 74.8 71.3 73.7 76.1 76.1 75.1

According to Table 4, the height of the sintering raw material layer was changed in the state where the ventilation member was used so that the void ratio, that is, the void ratio, in which the sintering productivity was the highest among the air hole polar constant (volume%) formed by the vent member, The sintering properties of the sintered ceramics were investigated.

[Comparative Examples 1 to 3]

In Comparative Examples 1 to 3, no voids are formed in the lower layer portion of the raw material layer, so there is no use condition of the ventilation member. As the height of the raw material layer increases, the sintering productivity is increased due to the increase of the charging density of the raw material layer and the sintering time , Respectively.

[Examples 1 to 3]

In Examples 1 to 3, sintering characteristics tested by varying the height of the sintering raw material layer in a state where the air permeability hole ratio was set to 0.84 vol% were compared with Comparative Examples 1 to 3 The sintering time is shortened because the air permeability of the raw material layer is secured and the productivity of sintering is increased for the sintered ores produced in Comparative Examples 1 to 3.

As described above, by using the sintering apparatus according to the embodiment of the present invention, the volume occupancy rate of the ventilating member in the lower layer portion of the raw material layer formed in the sintering vehicle is controlled in the range of more than 0 to 1.48 vol% or 0.8 to 1.0 vol% The process of manufacturing the sintering raw material is such that the moisture dried at the upper part of the sintering raw material is cooled and condensed at the lower part showing a relatively lower temperature than the upper part so that the condensed water remains in the lower part, And the sintering productivity due to the ventilation of the raw material layer can be increased by discharging the shape collapse through the air gap formed by the ventilation member.

Further, by securing the air permeability, it is possible to facilitate the flow of the sintering exhaust gas in the raw material layer so that the sintering exhaust gas can suppress and prevent the occurrence of drift in the lower layer portion of the raw material, thereby suppressing the decrease in sintered light intensity and recovery rate due to non- And can be prevented.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

S: Sintering raw material P: Pore
100: Primary mixer 200: Assembly machine
300: sintering apparatus 310: surge hopper
330: by ignition 350: sintered lorry
355a, 355b, 355c: insertion hole 370:
371: ventilation member 373: drive shaft
375: driver 377b, 377c: sealing member

Claims (7)

A plurality of sintering bogies into which a sintering material is charged;
An ignition means for injecting a flame into the raw material layer in the sintered bogie; And
Wherein the sintering blend material is disposed between a position where the sintering blend material is charged and the ignition source and when the raw material layer is divided into an upper layer portion, an middle layer portion and a lower layer portion from above, And an air gap forming portion having a member,
And the volume occupancy rate of the ventilation member in the lower layer portion is more than 0% and 1.48% by volume based on the whole area of the lower layer portion. The method according to claim 1,
The air gap forming portion
A support portion spaced apart from a side surface of the sintered bogie in a direction crossing the movement direction;
A drive shaft connected to the support portion and extending in the vertical direction and having one end connected to the ventilation member; And
And a driver connected to the other end of the drive shaft to reciprocate the drive shaft in a direction parallel to the moving direction of the sintered bogie. The method according to claim 1,
And the volume occupancy rate of the ventilation member in the lower layer region is 0.8 to 1.0% by volume. The method according to any one of claims 1 to 3,
And the average diameter of the ventilation member is 10 to 20 mm. Disposing a ventilation member in a sintering vehicle on which sintering of the sintering blend material mixture is performed;
And sintering the sintering blend raw material mixture in the sintered bogie,
Wherein the step of disposing the ventilation member in the sintering vehicle comprises the steps of:
Wherein when the raw material layer formed by the sintering blend material mixture in the sintering bogie is divided into an upper layer portion, an intermediate layer portion and a lower layer portion from above, the ventilation member is inserted into the lower layer portion, Wherein the volume occupancy rate of the ventilation member is in the range of more than 0 to 1.48% by volume. The method of claim 5,
And the volume occupancy rate of the ventilation member in the lower layer region is 0.8 to 1.0% by volume. The method of claim 5,
Wherein the ventilation member is inserted and installed within a height range of 30 to 65% based on the total height of the lower layer portion.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018074783A1 (en) 2016-10-18 2018-04-26 주식회사 포스코 Exhaust gas processing apparatus and processing method

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Publication number Priority date Publication date Assignee Title
JP2011252203A (en) 2010-06-02 2011-12-15 Nippon Steel Corp Method for manufacturing sintered ore, method for designing sinter cake supporting stand, and method for determining layer thickness of raw material filling-up layer
JP2012112003A (en) 2010-11-25 2012-06-14 Jfe Steel Corp Method for manufacturing sintered ore

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011252203A (en) 2010-06-02 2011-12-15 Nippon Steel Corp Method for manufacturing sintered ore, method for designing sinter cake supporting stand, and method for determining layer thickness of raw material filling-up layer
JP2012112003A (en) 2010-11-25 2012-06-14 Jfe Steel Corp Method for manufacturing sintered ore

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018074783A1 (en) 2016-10-18 2018-04-26 주식회사 포스코 Exhaust gas processing apparatus and processing method

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