WO2018021634A1 - 소결 장치 및 이를 이용한 소결광 제조 방법 - Google Patents

소결 장치 및 이를 이용한 소결광 제조 방법 Download PDF

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Publication number
WO2018021634A1
WO2018021634A1 PCT/KR2016/014732 KR2016014732W WO2018021634A1 WO 2018021634 A1 WO2018021634 A1 WO 2018021634A1 KR 2016014732 W KR2016014732 W KR 2016014732W WO 2018021634 A1 WO2018021634 A1 WO 2018021634A1
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WO
WIPO (PCT)
Prior art keywords
sintering
raw material
ignition furnace
bogie
layer
Prior art date
Application number
PCT/KR2016/014732
Other languages
English (en)
French (fr)
Korean (ko)
Inventor
왕민규
차진호
김성완
이승문
서성모
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020160097188A external-priority patent/KR101818512B1/ko
Priority claimed from KR1020160099524A external-priority patent/KR101862150B1/ko
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to EP16910655.6A priority Critical patent/EP3492852A4/en
Priority to CN201680088014.0A priority patent/CN109564065A/zh
Priority to JP2019504787A priority patent/JP2019526029A/ja
Publication of WO2018021634A1 publication Critical patent/WO2018021634A1/ko

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/04—Sintering pots or sintering pans
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge

Definitions

  • the present invention relates to a sintering apparatus and a sintered ore manufacturing method using the same, and more particularly to a sintering apparatus and a sintered ore manufacturing method using the same to improve the sintered ore production rate and to produce a sintered ore of uniform quality.
  • Sintered ore used as a raw material in the blast furnace making process is produced by mixing iron ore and coal (or coke) as a heat source, and then burning the coal and sintering iron ore with the heat of combustion.
  • the upper light stored in the upper light hopper and the compounding material stored in the surge hopper is put on the truck and transported, the moving truck passes through the lower part of the ignition furnace.
  • the flame (ie, flame) sprayed from the ignition furnace is ignited on the upper surface of the sintered raw material contained in the trolley, that is, the surface layer.
  • the trolley passing through the ignition furnace is transferred in the process progress direction by the conveyor, and the trolley passes through the upper side of the plurality of wind boxes arranged in the process progress direction.
  • a suction force is generated in the trolley passing through the upper side of the wind box in a downward direction, and the flame complexed by the air outside the sucked trolley is moved downward.
  • the complexed flame and the air introduced from the outside react with each other to cause a combustion reaction, and the temperature of the raw material layer around the flame rises to 1300 to 1400 ° C. Then, as the temperature rises, a low melting compound is formed by the reaction of the iron ore and the subsidiary materials, and a melt is locally produced, and the sintered ore is manufactured while solidifying in the course of cooling again. And when the trolley arrives at the wind box located at the end of the process, the flame reaches the bottom of the trolley, at which time the sintering is completed, and the above operation is carried out continuously for a plurality of trolleys.
  • the trolley in which the flame is ignited passes the wind box as described above, the flame or heat moves downward, and the sintered layer of the raw material layer is rapidly cooled by air at room temperature introduced from outside after the flame ignition. There is a problem that the temperature is lowered. Accordingly, the upper layer, which is the upper region of the raw material layer, lacks the amount of heat and reaction time for the sintering reaction, so that unreacted sintered ore (that is, the sintered ore in which the iron ore lacks the reaction) is generated in the upper layer, thereby reducing the sintered ore production rate or There is a problem of increasing the recovery rate of sintered ore.
  • the heat due to the flame of the upper portion is gradually moved to the lower side as the movement of the trolley, thereby causing a heat accumulation phenomenon in which the temperature rises toward the lower side. Accordingly, the amount of underfired sintered ore is increased in the lower portion of the raw material layer.
  • the temperature gradient of the raw material layer described above an unbaked sintered ore is generated in the upper layer portion, an underfired sintered ore is generated in the lower layer portion, and there is a problem in that a quality deviation of the sintered ore is generated in one bogie.
  • an additional heat source is added to the uppermost surface of the raw material layer to increase the reaction temperature or to increase the sintered ore strength due to the increased amount of melt produced on the uppermost surface.
  • a method of adding the same auxiliary material has been proposed. However, in the case of such a method, as the fine heat source or sub-material is added to the uppermost surface of the raw material layer, the heat source or sub-material is scattered and dust is generated, which causes a problem in environmental aspects.
  • the present invention provides a sintering apparatus capable of improving the sintered ore production rate and producing a sintered ore of uniform quality, and a sintered ore manufacturing method using the same.
  • the present invention provides a sintering apparatus capable of suppressing generation of unbaked sintered ore in the upper layer and undersintered sintered ore in the lower layer, and a sintered ore manufacturing method using the same.
  • the present invention provides a sintering apparatus and a sintered ore manufacturing method using the same that can increase the reaction temperature rise and the reaction time at the surface layer portion of the blended raw material in the balance.
  • the sintering apparatus can be charged with the sintering raw material, the trolley movable in the sintering process progress direction;
  • An ignition furnace installed to inject flames into the raw material layer charged in the trolley on a path in which the trolley moves in the direction of the sintering process;
  • a plurality of wind boxes installed at a lower side of the ignition furnace and arranged so that an area of a suction passage becomes smaller from the ignition furnace toward the end point of the sintering.
  • Each of the plurality of wind boxes has a cylindrical shape having an inner space, and includes one side opening opened in the direction of the bogie and the other side opening opened in a direction in which a blower connected to the plurality of wind boxes is located,
  • the plurality of wind boxes are arranged so that the suction passage area becomes smaller toward the end point of sintering.
  • a wind box having a smaller inner diameter of one side opening is provided toward the end point of the sintering.
  • the other openings of the plurality of wind boxes are formed to have the same inner diameter, and the inclination from the one opening to the other opening increases with respect to the center of the width direction of the wind box toward the end point of the sintering process.
  • Each of the plurality of wind boxes has a cylindrical shape having an inner space, and includes one side opening opened in the direction of the bogie and the other side opening opened in a direction in which a blower connected to the plurality of wind boxes is located.
  • Inside the shutter is provided to control the communication between the opening and the other opening, the plurality of wind box is arranged so that the area of the suction passage is reduced from the ignition furnace toward the end of the sintering line, the sintering end point Increasingly, the open area of the shutter is reduced.
  • the plurality of wind boxes are referred to as a sintering section from the ignition furnace to the sintering point, the plurality of wind boxes are arranged so as to reduce the area of the suction passage toward the sintering end point in the entire sintering section.
  • the plurality of wind boxes are referred to as a sintering section from the ignition furnace to the end point of sintering, and the middle layer, which is the lower layer of the upper portion and the first half, is the sintering section in which the sintering reaction of the upper layer including the upper surface of the raw material layer is mainly performed in the moving truck.
  • the middle part is compared with the area of the suction passage of the wind box disposed corresponding to the first part.
  • the area of the suction passage of the wind box correspondingly arranged is small, and the area of the suction passage of the wind box correspondingly arranged in the latter half is smaller than the area of the suction passage of the wind box arranged correspondingly to the middle portion.
  • the plurality of windboxes corresponding to the first half are mutually the same suction passages
  • the plurality of windboxes corresponding to the middle portion are mutually the same suction passages
  • the plurality of windboxes corresponding to the second half are mutually Suction passages are identical.
  • the plurality of wind boxes are referred to as a sintering section from the ignition furnace to the end point of sintering, and the middle layer, which is the lower layer of the upper layer and the first half, is a sintering section in which the sintering reaction of the upper layer including the upper surface is mainly performed in the moving truck.
  • the sintering section where the sintering reaction is mainly performed in the middle part and the sintering section where the sintering reaction is mainly performed in the lower layer, which is the lower part of the middle part is called the second half
  • the plurality of wind boxes are sucked toward the end point of sintering in some of the sintering sections.
  • the area of the passage is arranged so as to be small, and the area of the suction passages of the wind boxes disposed corresponding to the first half is larger than the area of the suction passages of the wind boxes disposed corresponding to the mid and second half.
  • a reflection member installed in front of the ignition furnace or in the ignition furnace on the moving path of the trolley, reflecting radiant energy generated from the raw material layer and transmitting the radiant energy back to the raw material layer.
  • one end of the reflective member When the reflective member is installed in front of the ignition furnace, one end of the reflective member is positioned in front of the ignition furnace, and is formed to extend in the sintering process progress direction from the one end, and the reflective member is formed to extend in the sintering process progress direction.
  • the position of the other end of the sintering section in which the plurality of windboxes are arranged side by side, the sintering reaction position in the trolley where the sintering reaction is gradually moving downward while moving is the lower point of any one of 80 mm to 120 mm from the surface of the raw material layer. It is located at the sintering point when.
  • the sintering apparatus is a plurality of trolleys, each of which is capable of charging a sintering raw material, and movable in the sintering process progress direction;
  • a hopper installed to charge the sintered raw material into the bogie;
  • An ignition furnace positioned in front of the hopper on the basis of the process progress direction of the bogie and installed to inject a flame into the raw material layer of the sintered raw material charged into the bogie;
  • a lance installed to supply a heat source into the upper layer part of the raw material layer from the rear of the ignition furnace.
  • the lance is formed extending in a direction corresponding to the moving direction of the bogie, the front end of the heat source is discharged in the rear of the ignition furnace, in front of the point where the charging of the sintering raw material is completed or the loading of the sintering raw material is completed. It is installed to be located.
  • a tip of the lance is located between the hopper and the ignition furnace.
  • the pressurization portion for pressurizing the raw material layer to which the heat source is additionally added is located between the hopper and the pressing portion.
  • a ventilation bar extending in a direction corresponding to the moving direction of the trolley and installed at a position corresponding to the middle and lower layers of the raw material layer at the rear of the ignition furnace, and capable of being inserted into and removed from the trolley.
  • the lance is located above the vent bar, and the tip of the lance is located between the tip of the vent bar and the ignition furnace.
  • the sintered ore manufacturing method comprises the steps of charging the sintered raw material into the bogie moving in the direction of the sintering process; Passing the trolley into which the sintered raw material is loaded to the lower side of the ignition furnace to ignite the flame on the raw material layer loaded with the sintered raw material; And moving the trolley on which the flame is ignited from the lower side of the ignition furnace to the upper end of the plurality of wind boxes installed at the end of the sintering process, increasing the rate at which external air flows into the trolley toward the end of the sintering process. It includes; the process of proceeding.
  • the arrangement of the plurality of windboxes is adjusted to reduce the area of the suction passage from the lower side of the ignition furnace to the end point of the sintering process. .
  • Each of the plurality of wind boxes has a tubular shape having an inner space, and includes one side opening opened in a moving path direction of the trolley and the other opening opened in a direction in which a blower connected to the plurality of wind boxes is located.
  • a windbox having a smaller inner diameter of the one side opening toward the end point of the sintering is provided.
  • Each of the plurality of wind boxes has a tubular shape having an internal space, and includes one side opening opened in the moving path direction of the trolley and the other opening opened in a direction in which a blower connected to the plurality of wind boxes is located.
  • the shutter In adjusting the arrangement of the plurality of windboxes so as to reduce the area of the suction passage from the lower side of the ignition furnace to the end point of the sintering process, the shutter to control the communication between one opening and the other opening inside the plurality of windboxes And the opening area of the shutter decreases toward the end point of the sintering.
  • the plurality of wind boxes are referred to as a sintering section from the ignition furnace to the end point of sintering
  • the arrangement of the plurality of wind boxes is controlled such that the area of the suction passage decreases as the plurality of wind boxes reach the end point of sintering in the entire sintering section.
  • the plurality of wind boxes are referred to as a sintering section from the ignition furnace to the end point of sintering, and the middle layer, which is the lower layer of the upper portion and the first half, is the sintering section in which the sintering reaction of the upper layer including the upper surface of the raw material layer is mainly performed in the moving truck.
  • the sintering section in which the sintering reaction is mainly performed in the middle part and the sintering section in which the sintering reaction is mainly performed in the lower part which is the lower layer of the middle part is called the second half, outside air is introduced into the trolley disposed correspondingly to the upper side of the wind box disposed correspondingly to the first part.
  • the outside air flows into the trolley disposed corresponding to the upper side of the wind box disposed correspondingly to the middle portion, and the outside air flows into the trolley disposed correspondingly to the upper side of the wind box disposed correspondingly to the middle portion.
  • the suctioned flow rate corresponds to the upper side of the wind box disposed corresponding to the latter half. It is small compared to the flow rate at which outside air is drawn into the mounted bogie.
  • the plurality of wind boxes are referred to as a sintering section from the ignition furnace to the end point of sintering
  • the middle layer which is the lower layer of the upper portion and the first half
  • the sintering section in which the sintering reaction of the upper layer including the upper surface of the raw material layer is mainly performed in the moving truck.
  • the flow rate of suction is increased, and the outside air flows to the upper side of the wind box disposed corresponding to the middle and the second half, and the outside air flows to the upper side of the wind box disposed corresponding to the first half. Small compared to the incoming flow rate.
  • Charging a sintered raw material into a bogie moving in the process progress direction When the raw material layer loaded with the sintered raw material is divided into an upper layer part, a middle layer part and a lower layer part from the uppermost surface, when charging of the sintered raw material is completed at a target height, a heat source is provided inside the upper layer part of the raw material layer loaded with the sintered raw material. Adding process; And manufacturing a sintered ore by igniting a flame on the surface layer of the raw material layer in the trolley in which the heat source is added to the upper layer, and moving the trolley in the direction of the sintering process.
  • the sintering raw material In the charging of the sintering raw material into the trolley, the sintering raw material is charged from one side to the other side in the trolley according to the moving direction of the trolley, and the charging of the sintering raw material is completed at a desired height from one side to the other side.
  • the heat source In the addition of a heat source into the upper layer portion of the raw material layer, the heat source is sequentially added into the upper layer portion from one side of the bogie to which charging of the sintered raw material is completed to the other side.
  • the heat source is ejected from the rear of the ignition furnace using a lance extending in a direction corresponding to the moving direction of the bogie.
  • the heat source In adding the heat source, the heat source is ejected between the hopper for charging the sintered raw material into the bogie and the ignition furnace.
  • the bogie to which the heat source is added into the upper layer passes through the press section located between the hopper and the ignition furnace, while the raw material layer is pressed by the press section and then passes through the ignition furnace bottom.
  • a ventilation bar extending in the bogie in a direction corresponding to the moving direction of the bogie is disposed,
  • the venting bar is located at least one of the middle and lower layers of the raw material layer in the bogie.
  • the heat source includes a powder composed of a plurality of particles.
  • a gas is added together to assist the movement of the heat source, and the gas includes either air or an inert gas.
  • the unreacted sintered bundle generation in the upper layer and the under-fired sintered ore generation in the lower layer can be suppressed or reduced.
  • a sintered ore having a uniform quality can be obtained regardless of the upper layer, the middle layer, and the lower layer or for the entire raw material layer.
  • the temperature of the upper layer portion is increased by the added heat source, and the degree and speed of temperature drop by the air sucked from the outside can be lowered. . Therefore, the temperature in the upper layer is higher than in the prior art, and the reaction time is increased in comparison with the conventional, so that the upper layer is sintered for sufficient heat and reaction time. For this reason, the sintered ore production rate in an upper layer part can be improved.
  • the fine powder heat source is supplied to the upper layer part from the lower side of the upper surface of a raw material layer using the lance which concerns on 2nd Example.
  • the heat source or subsidiary material of the fine powder is supplied so as not to be exposed to the outside of the raw material layer, it is possible to minimize or prevent dust generation by the heat source or subsidiary material of the fine powder. Accordingly, there is an effect that can minimize or prevent the problem of environmental pollution.
  • FIG. 1 is a view illustrating main parts of a sintering apparatus according to a first embodiment of the present invention
  • FIG. 2 is a view for explaining a plurality of wind boxes according to a first embodiment of the present invention.
  • FIG. 3 is a view for explaining a plurality of wind boxes according to a modification of the first embodiment
  • FIG. 4 is a diagram for explaining a raw material layer in a trolley
  • FIG. 6 is a view showing the temperature according to the reaction time in the sintering apparatus according to the prior art and the first embodiment
  • FIG. 7 is a view for explaining an installation position of a reflective member according to the first embodiment of the present invention.
  • FIG. 8 is a view illustrating main parts of a sintering apparatus according to a second embodiment of the present invention.
  • FIG. 9 is a view for explaining charging of a sintering raw material and charging of a heat source in the sintering apparatus according to the second embodiment of the present invention.
  • 11 is a view for explaining the position of the lance tip from which the heat source is ejected;
  • FIG. 13 is a view for explaining a loaded sintered raw material and a further charged heat source in a bogie
  • 1 is a view showing main parts of a sintering apparatus according to a first embodiment of the present invention.
  • 2 is a view for explaining a plurality of wind boxes according to a first embodiment of the present invention.
  • 3 is a view for explaining a plurality of wind boxes according to a modification of the first embodiment. It is a figure for demonstrating the raw material layer in a trolley
  • bogie. 5 is a graph showing the tendency of the sintering reaction temperature according to the flow rate.
  • the sintering apparatus includes a hopper in which a sintering raw material is stored, a sintering raw material is charged, and a plurality of bogies 30 sequentially moving in the sintering process progressing direction and extending in the process progressing direction.
  • An ignition furnace installed at an upper side of the conveyor 40 at one side of the conveyor 40 and the hopper 13 for transferring the plurality of trolleys 30, and injecting a flame into the sintered raw material charged into the trolley 30.
  • the plurality of wind boxes 50 and trolleys 30 are arranged on a path through which the plurality of trolleys 30 are transported from the lower side of the conveyor 40, and suck or suck the inside of the trolley 30.
  • the sintering apparatus includes a dust collector 60 for collecting dust in exhaust gas discharged through the storage bin 11 and the wind box 50 in which various raw materials (that is, sintered raw materials) for manufacturing sintered ore are respectively stored.
  • bogie 30 includes the compounding raw material charged to the upper side of the upper light and the upper light which are the raw materials initially charged to the trolley
  • the blended raw material includes a secondary raw material including a binder containing lime (C), limestone or quicklime such as Fe-containing iron ore, powdered coke and anthracite.
  • the blended raw material may further include carbon or iron by-products containing both iron and carbon and raw materials for basicity control.
  • the storage bin 11 stores the constituent raw materials of the above-described blended raw materials, namely iron ore, binders, by-products, secondary raw materials, basicity adjusting raw materials, and the like, and the raw materials are moved to the granulator 12 to be mixed and assembled.
  • the blending raw material and the granulator for mixing them may be provided separately.
  • the hopper 13 includes a first hopper 14 in which the upper light is stored, and a second hopper 15 in which the granulated material of the blended raw material is stored.
  • the first and second hoppers 14 and 15 are installed to be located behind the ignition furnace 20 based on the movement path of the trolley 30 above the trolley 30.
  • the 2nd hopper 15 is located in front of the 1st hopper 14 with respect to the movement path of the trolley
  • the second hopper 15 loads the sintered raw material evenly in the width direction of the trolley 30 without particle size segregation, and in the depth direction of the trolley 30 (ie, the up and down direction), the sintered raw material goes from the lower side to the upper side. The mouth is segregated and charged so that becomes small.
  • the ignition furnace 20 is located in front of the second hopper 15 to supply the flame to the surface layer of the raw material layer formed by charging the sintered raw material into the trolley 30 to ignite it.
  • the trolley 30 is provided to provide a space for forming a raw material layer by charging the sintered raw material, that is, the upper light and the blended raw material, and having an internal space, and the upper side where the hopper 13 and the ignition furnace 20 are located. It is an open shape. Such a trolley 30 may be disposed such that at least a portion of the ventilation bar (not shown) can be inserted into and removed from the raw material layer.
  • the raw material layer has a lower layer portion L3 and a lower layer portion L3 extending from a lower surface in contact with a bottom portion of the trolley 30 to a predetermined height upward. It can be divided into the middle layer part L2 to a fixed height from the upper side, and the upper layer part L1 from the middle layer part L2 to the uppermost surface.
  • the upper layer part L1 means a lower point of 80 mm to 120 mm, preferably a depth of 100 mm from the uppermost surface of the raw material layer, and the lower area of the upper layer part L1 is the middle layer part L2 and the middle layer.
  • the lower part L2 is the lower layer part L3.
  • a section in which a plurality of wind boxes are arranged in a moving path of the trolley is called a sintering section.
  • the sintering reaction proceeds downwardly.
  • the sintering proceeds in the order of the upper layer part L1, the middle layer part L2, and the lower layer part L3.
  • sintering reaction of the middle portion and lower layer portion L3 is mainly performed in the first half portion of the sintering section where the sintering reaction of the upper layer portion L1 of the raw material layer is mainly performed, and in the sintering portion mainly in which the sintering reaction of the middle layer portion L2 is performed.
  • the resulting sintering section is called the latter half. That is, the sintering section is divided into the first half, the middle half, and the second half in the direction of the light distribution unit from the ignition furnace 20.
  • the plurality of wind boxes 500 suck the outside air into the trolley 30 to move the flame or the heat caused by the movement of the trolley 30 downward.
  • the plurality of wind boxes 500 are arranged in a section between the ignition furnace 200 and the light distribution unit.
  • the wind box 500 has a cylindrical shape having an inner space in which an upper side corresponding to a lower portion of the trolley 30 and a blower 60 are positioned, for example, a lower side thereof is opened.
  • the wind box 500 is provided in plurality, and arranged in such a way that the plurality of wind boxes 500 are arranged in series from at least a position corresponding to the ignition path 20 to the light distribution unit in the moving path of the trolley 30.
  • a pipe is connected to each of the plurality of wind boxes 500, and the pipe is connected to the dust collector 60 and the blower 60.
  • the wind box 500 has a cylindrical shape in which a direction facing the truck 30 and a direction in which the pipe is connected are opened.
  • the opening in the direction in which the vehicle 30 is oceanic is referred to as one side opening
  • the opening in the direction connecting with the pipe is referred to as the other side opening.
  • one opening of the wind box 500 may be an upper opening
  • the other opening may be a lower opening. At this time, one opening of the wind box 500 (that is, the upper opening) becomes the suction passage.
  • a plurality of wind boxes 500 are arranged from the position of the ignition furnace to the light distribution unit, and the wind box 500 is gradually moved from the ignition furnace 20 toward the sintering process progressing direction or the light distribution unit direction. It is configured to reduce the area of the suction passage. That is, a plurality of wind boxes are arranged side by side so that the inner diameter of one side opening becomes smaller toward the end point of sintering. At this time, the other opening (lower opening) of the wind box 500 through which gas and dust are discharged may have the same inner diameter.
  • the suction passages of one of the plurality of wind boxes arranged in the sintering section that is, the areas of one side opening are all different, and the area of the one side opening decreases toward the end point of sintering. do.
  • the spacing between the plurality of bogies becomes smaller toward the end point of sintering.
  • the inclination increases as the outer circumferential surface of the wind box 500 extending in the direction from the one side opening toward the other side toward the end point of the sintering.
  • a plurality of wind boxes 500 are arranged from the position of the ignition furnace 20 to the light distribution unit, and the inner diameter of one side opening is reduced toward the light distribution unit from the ignition furnace 20 toward the light distribution unit. . That is, a wind box 500 having a smaller inner diameter of one side opening is provided toward the light distribution part or closer to the light distribution part.
  • the inner diameter W1 of one side opening increases from the light distribution part toward the ignition furnace 20. That is, a wind box 500 having a larger inner diameter W1 of one side opening is provided toward the light distribution unit rotor ignition furnace 20 or closer to the ignition furnace 20.
  • the inner diameter (W2) of the other side opening of the plurality of wind boxes 500 are all the same.
  • the plurality of wind boxes 500 are arranged in this way, it is possible to adjust the flow rate of the outside air flows into the trolley. That is, when the outside air flows into each of the plurality of trucks, the inflow flow rate of the outside air increases toward the light distribution part. In other words, the flow rate of the outside air flowing into the trolley from the light distribution part toward the ignition furnace 20 decreases.
  • the upper opening inner diameter W1 of the wind box 500 is adjusted, but the suction passage area may be adjusted in the wind box 500.
  • the plurality of wind boxes 500 according to the modified example have the same inner diameters of the upper opening and the lower opening, but the area W3 communicating between the upper opening and the lower opening in the plurality of wind boxes 500. Adjust to become narrower toward this light distribution part.
  • the suction passage in the windbox according to the second embodiment is the open area of the shutter.
  • a shutter 800 for controlling communication between the upper opening and the lower opening is installed in each of the plurality of wind boxes 500, and adjusts the degree of opening and closing of the shutter 800 inside each wind box 500. Thereby, it can adjust so that opening area W3 may become narrow toward the light distribution part direction.
  • interval between a plurality of wind boxes is all the same, and also the inclination of the outer peripheral surface toward one opening from one side opening is also the same.
  • the number of windboxes may be less than that of the first embodiment.
  • the area of the suction passage of the wind box 500 decreases from the ignition furnace 20 toward the sintering process progress direction or the light distribution direction.
  • the present invention is not limited thereto, and the area of the suction passage decreases toward the end point of the sintering, but some wind boxes may have the same suction passage.
  • the area W1 of the suction passage of the windbox 500 disposed corresponding to the middle is smaller and correspondingly disposed in the middle portion.
  • the area W1 of the suction passage of the wind box 500 corresponding to the latter half is smaller.
  • the present invention is not limited thereto, and the area W1 of the suction passage may be small only in a portion of the sintering section.
  • the suction passage area W1 decreases as the plurality of windboxes 500 move from the ignition furnace 20 to the end point of sintering only in the first half section, and the plurality of windboxes 500 corresponding to the middle and second half portions are suctioned.
  • the area W1 of the passage is the same, it may be configured to be smaller than the suction passage of the first half.
  • the flow rate of the outside air flows into the trolley from the first half, the middle half, and the second half increases by adjusting the opening area of the plurality of wind boxes 500. That is, the inflow flow rate of air in the first half where the reaction of the upper layer (L1) mainly proceeds is lower than the middle portion, and the inflow flow rate of air in the middle half where the reaction of the middle layer (L2) mainly proceeds is lower than the second half.
  • the time for which the heat is stagnated in the upper layer portion L1 is increased, and thus, at a high temperature for the sintering reaction.
  • the reaction holding time of the is increased. Accordingly, since the upper layer portion L1 is sintered for sufficient heat and reaction time, the sintered ore production rate in the upper layer portion L1 can be improved, and the production rate of the entire raw material layer is improved.
  • the time that the heat generated by the combustion of the flame and the binder stagnates in the second half can be shortened compared to the conventional one, thereby suppressing the problem of overfiring in the lower layer L3. Or can be prevented.
  • the inner diameter W1 of one side opening decreases toward the light distribution unit direction, or one side toward the ignition furnace direction. Increase the inner diameter W1 of the opening.
  • the sintering reaction time in the upper layer portion L1 is increased compared to the conventional art, and the sintering reaction temperature and the sintering reaction time in the lower layer portion W3 decrease. Therefore, it is possible to suppress or reduce the unreacted sintered bundle generation at the upper layer portion L1 and the generation of underfired sintered ore at the lower layer portion L3. As a result, sintered ore having a uniform quality can be obtained regardless of the upper layer portion L1, the middle layer portion L2 and the lower layer portion L3 or the entire raw material layer.
  • the reflective member 300 is installed in front of the ignition furnace 20 or inside the ignition furnace, and transmits radiant energy generated from the upper layer part L1 to the upper layer part again. That is, the reflective member 300 additionally supplies a heat source to the upper layer portion L1 by utilizing the radiant energy generated in the upper layer portion L1.
  • the reflective member 300 may be made of a material, for example, a metal, capable of reflecting radiant energy to supply the upper layer part L1.
  • the shape having an opening so that the outside air can flow into the bogie located below the reflective member 300 It consists of.
  • One or more openings may be in the form of a mesh formed spaced apart from each other.
  • the reflective member 300 is formed to extend in the balance movement direction. When the reflective member 300 is installed in front of the ignition furnace 20, one end of the reflective member 300 is formed in the ignition furnace 20. Located in the front, extending from the one end in the moving direction of the truck 30, the other end is the other end.
  • sintering position As the trolley
  • the other end of the reflective member 300 is extended so as to be located at the sintering section point when the sintering position is located at a distance of any one of 80 mm to 120 mm downward from the upper surface of the raw material layer.
  • h 1 and 120 mm spaced apart points are defined as h 2 and 80 mm spaced downward from the upper surface of the raw material layer.
  • the sintering position is h 1
  • the position in the sintering section is X 1
  • the position in the sintering section is X2.
  • the reflective member 300 is extended so that the other end thereof is located at the minimum X 1 point, and is formed to extend at the maximum X 2 point (see FIG. 7).
  • the reflective member 300 extends from the rear of the ignition furnace 20 to any one of X 1 to X 2 in the sintering section. This is to allow an additional heat source supply to the upper layer part L1 of the moving truck by the reflective member 300.
  • the temperature of the upper layer part L1 rises by such a heat source supply by a reflecting member.
  • the upper layer portion L1 is sintered for a sufficient heat and reaction time, thereby improving the sintered ore production rate at the upper layer portion L1.
  • a sintered raw material for preparing a sintered ore that is, a top light and a blended raw material is prepared.
  • the top light is a sintered ore with a small particle size of 2 to 3 mm among the already prepared sintered ore, and is not used for blast furnace operation, but is used as the top light at the time of processing of the next charge raw material.
  • the upper light facilitates the flow of the gas in the trolley 30 in the raw material processing process, and serves to protect the trolley made of iron material when the iron ore raw material is melted.
  • the blended raw material includes a secondary raw material including a binder containing lime (C), limestone or quicklime such as Fe-containing iron ore, powdered coke and anthracite.
  • the prepared upper light is transferred to the first hopper 14 and stored, and the blended raw material is stored in the storage bin 11 and then assembled in an assembly form in the granulator 12 and charged into the second hopper 15 for storage. do.
  • the upper light and the assembly are sequentially passed through the first hopper 14 and the second hopper 15 while passing through the lower side of the first hopper 14 and the second hopper 15. Charges.
  • the one truck 30 passes through the lower side of the first hopper 14, and the upper light is charged into the inside, and the upper light is charged.
  • the assembled vehicle 30 is charged by passing the lower side of the 2nd hopper 15.
  • bogie 30 moves from the left side to the right direction, charging to the desired height of a sintering raw material is completed from the right side to the left side of the trolley 30.
  • the charged cart 30 is moved to pass through the lower side of the ignition furnace 20, at which time, a spark is ignited from the ignition furnace 20 is ignited on the upper surface (or surface layer portion) of the raw material layer.
  • the trolley 30 in which the flame is ignited moves in the direction in which the plurality of wind boxes 50 are arranged or in the direction in which the light distribution unit is located.
  • the outside air is supplied into the trolley 30 and sucked by the suction force of the wind box 50.
  • the flame gradually moves downward due to the movement of the trolley 30, whereby the sintering reaction proceeds from the upper side to the lower side of the raw material layer, thereby producing a sintered ore.
  • each of the plurality of trolleys 30 moves in the direction in which the light distribution unit is located from the upper side of the wind box 500 under the ignition furnace 20, and the position of the combustion zone in each of the trolleys 30 is from the upper layer L1 to the lower layer L3. Go to).
  • the plurality of wind box 500 is installed or configured so that the open area becomes narrower toward the light distribution part or the open area becomes wider toward the direction in which the ignition furnace 20 is located. . That is, as in the first embodiment shown in FIG. 2, the wind box 500 having a smaller area W1 of the upper opening toward the light distribution part is disposed, or a plurality of wind boxes as shown in FIG. 3.
  • the opening area (W3) of the shutter 800 becomes narrower toward the light distribution part.
  • the flow rate of the outside air flowing into the trolley 30 increases in the first half and the second half of the sintering section.
  • the time at which heat is stagnated in the upper layer portion L1 is increased, so that the reaction holding time at a high temperature for the sintering reaction is increased. Accordingly, since the upper layer portion L1 is sintered for sufficient heat and reaction time, the sintered ore production rate in the upper layer portion L1 can be improved, and the production rate of the entire raw material layer is improved.
  • the trolley 30 in which the flame is ignited in the ignition furnace 20 passes through the lower side of the reflective member 300 provided in front of the ignition furnace 20.
  • the radiant energy generated by the flame complexed from the ignition furnace 20 to the upper portion is reflected while passing through the lower side of the reflective member and is transferred back to the upper portion, an additional heat source is supplied to the upper layer.
  • the temperature of the upper layer portion L1 is increased, and the upper layer portion L1 is sintered for sufficient heat and reaction time, thereby improving the sintered ore production rate at the upper layer portion L1.
  • the present invention by controlling the flow rate of the air through the plurality of wind box 500, and by additionally supplying the heat source to the upper layer using the reflective member 300, the unreacted sintered balm in the upper layer and undersized in the lower layer The generation of sintered ore can be suppressed or reduced. As a result, sintered ore having a uniform quality can be obtained regardless of the upper layer portion L1, the middle layer portion L2 and the lower layer portion L3 or the entire raw material layer.
  • FIG. 8 is a view illustrating main parts of a sintering apparatus according to a second embodiment of the present invention.
  • 9 is a view for explaining charging of a sintering raw material and charging of a heat source in the sintering apparatus according to the second embodiment of the present invention.
  • 10 is a view for explaining the installation of the ventilation bar and the lance on the basis of the truck. It is a figure for demonstrating the position of the lance tip from which a heat source is ejected.
  • 12 is a view showing the structure of a lance according to a second embodiment of the present invention. It is a figure explaining the sintered raw material loaded in the trolley
  • a hopper in which a sintering raw material is stored and a sintering raw material are charged, and a plurality of trolleys 30 sequentially moving in the sintering process progress direction extend in the process progress direction.
  • the ignition furnace 20 is installed on the conveyor 40, one side of the hopper 13 for transporting a plurality of trolley 30, the upper side of the conveyor 40, injecting a flame to the sintered raw material charged into the trolley 20
  • the rear side of the ignition furnace is installed on the path in which a plurality of trucks are transported from the lower side of the conveyor 40, and the plurality of wind boxes 50 and the trucks 30 that suck or suck the inside of the trucks are referred to.
  • a lance 110 for supplying a heat source into the upper layer of the sintered raw material layer (hereinafter, referred to as a raw material layer) placed in the bogie.
  • a lance 110 for supplying a heat source into the upper layer of the sintered raw material layer (hereinafter, referred to as a raw material layer) placed in the bogie.
  • a lance 110 for supplying a heat source into the upper layer of the sintered raw material layer (hereinafter, referred to as a raw material layer) placed in the bogie.
  • the pressurizing portion 300 to press the upper portion of the raw material layer is compacted.
  • the sintering apparatus includes a storage bin 11 in which various raw materials (that is, sintered raw materials) for manufacturing a sintered ore are mixed, a granulator 12 that mixes a plurality of sintered raw materials, and adds water to granulate granules, and a bogie ( A dust collector for collecting dust in the exhaust gas discharged through the light distribution unit in which the sintered ore is distributed from the light emitting unit 100, the blower 70 connected to the plurality of wind boxes 50, and the outside air is sucked into the trolley, and the wind box 50 ( 60).
  • various raw materials that is, sintered raw materials
  • a granulator 12 that mixes a plurality of sintered raw materials, and adds water to granulate granules
  • a bogie A dust collector for collecting dust in the exhaust gas discharged through the light distribution unit in which the sintered ore is distributed from the light emitting unit 100, the blower 70 connected to the plurality of wind boxes 50, and the outside air is sucked into the
  • the raw material layer has a lower layer portion L3 and a lower layer portion L3 extending from a lower surface contacting the bottom portion of the trolley 30 to a predetermined height upward. It can be divided into the middle layer part L2 to a fixed height from the upper side, and the upper layer part L1 from the middle layer part L2 to the uppermost surface. More specifically, the upper layer portion L1 means a depth of 100 mm from the top surface of the raw material layer to the lower side, and the lower region of the upper layer portion L1 is the middle layer portion L2 and the lower portion of the middle layer portion L2 is the lower layer portion L3. )to be.
  • the venting bar 200 is inserted into or removed from the lower side of the second hopper 15 that charges the blended raw material into the trolley 30 moving downward of the second hopper 15 in the moving path of the trolley 30. It is provided so that it can ensure the air permeability of the raw material layer in the trolley
  • the ventilation bar 200 has a bar shape extending in the moving direction of the trolley 30, and as illustrated in FIG. 10, a plurality of ventilation bars 200 are provided, and the trolley 30 intersects with the moving direction of the trolley 30. It is installed to be listed in the width direction and the height direction. That is, the plurality of vent bars 200 are spaced apart from each other in the width direction of the trolley 30, and the plurality of vent bars 200 arranged in the width direction may be installed in multiple stages or in multiple layers.
  • the upper layer portion L1 means the uppermost surface of the raw material layer and the uppermost surface from the uppermost surface to a point below a predetermined distance, for example, 100 mm lower.
  • the term “inside the upper layer portion L1” to which the heat source is added or supplied means an area except the uppermost surface of the raw material layer, that is, the uppermost surface of the upper layer portion L1, of the upper layer portion L1.
  • the heat source supplied into the upper layer part L1 of the raw material layer is a raw material containing carbon (C), for example, solid state of at least one of anthracite coal and powdered coke, and is preferably fine powder having small particles.
  • C carbon
  • the heat source supply unit 120 is an upper layer portion L1 of the raw material layer, as well as a heat source, in addition to the subsidiary materials included in the blended raw material, the sublayers such as raw materials including quicklime and quicklime are further added to the upper layer portion L1. Supply.
  • the carrier gas is supplied together to the lance 110.
  • the raw material storage unit 120, 130, 140 according to the second embodiment includes a heat source storage unit 130, gas storage unit 120 and the sub-material storage unit 140, each through a separate pipe It is connected to the lance 110.
  • the lance 110 supplies at least one of a heat source and a subsidiary material to the upper layer portion L1 of the raw material layer.
  • the lance 110 is formed to extend in the moving direction of the trolley 30, the heat source and the sub-material is moved to the inside is ejected or discharged to the outside through the open tip.
  • the lance 110 supplies a gas at the same time in order to smoothly supply the heat source or the heat source.
  • the lance 110 includes an inner tube 111, which is a moving passage of a heat source or a subsidiary material, and an inner tube 111 is inserted therein, and a gas, for example, air, which assists the movement of the heat source or a subsidiary material. and an exterior 112 which is a moving passage of air or inert gas.
  • the lance 110 is in the form of a double tube in which the inner tube 111 is inserted into the outer tube 112, a heat source or an auxiliary raw material is ejected to the tip of the inner tube 111, and gas is ejected to the tip of the outer tube 112.
  • the lance 110 has a double tube structure including an inner tube 111 which is a moving passage of a heat source or a subsidiary material and an outer side 112 which is a moving passage of a gas.
  • the lance 110 is not limited to this, and may be in the form of a single tube instead of a double tube. That is, the lance 110 is composed of a single tube, through which the heat source or subsidiary materials and gas can be ejected together.
  • a plurality of lances 110 are provided and arranged in a direction crossing or perpendicular to the moving direction of the trolley as shown in FIG. 10 and spaced apart from each other.
  • the plurality of lances 110 may be spaced apart at equal or irregular intervals.
  • the lance 110 is provided to correspond to the upper layer portion L1 at a position in the height direction of the raw material layer. That is, when 100% of the sintered raw material is loaded at the target height to be charged in the trolley 30 (charging is completed), the upper layer portion (up to 100 mm deep from the top surface of the raw material layer (the layer on which the sintered raw material is loaded) is lowered, for example). L1), the lance 110 is provided at a position below the top surface of the raw material layer within a point 100 mm away from the top surface.
  • the heat source is to be ejected to be located in the upper layer (L1) in a state where the sintered raw material is 100% charged to the height to be charged.
  • bogie 30 moves from the left side to the right direction in the sintering process progress direction FIG. 8, for example, When looking in the left-right direction of each trolley
  • the heat source is supplied to the upper layer part L1 at the point where charging is completed, and the heat source is not supplied to the point where charging is not completed.
  • the compounding material of the upper layer portion L1 is reacted at a sufficient reaction temperature, thereby improving the reactivity of the upper layer portion L1, and thus the upper layer portion ( The occurrence of unreacted sintered ore in L1) can be minimized or prevented.
  • the upper layer portion to which the heat source or subsidiary material is added ( The charging density of L1) is improved, thereby increasing the time for the high temperature heat to stay in the upper layer portion L1, thereby improving the reactivity of the upper layer portion L1.
  • the lance 110 according to the second embodiment is blown or added to the upper layer portion of the fine powder heat source or sub-material, but the heat source or sub-material of the fine powder is not added onto the uppermost surface of the raw material layer, but in the upper layer portion L1, A heat source or side feed is added from the top surface to the bottom. That is, the heat source or the subsidiary material of the fine powder is added so as not to be exposed to the outside of the raw material layer. Therefore, it is possible to minimize or prevent the generation of dust by the additional heat source or secondary raw material of the fine powder, thereby minimizing or preventing this environmental pollution problem.
  • Figure 15 is a graph showing the productivity according to the heat source addition depth.
  • the sintered raw material is prepared, under the same conditions.
  • the blended raw material includes a binder of 3.8 wt% based on the total blended raw material.
  • the heat source was added to a position spaced 150 mm downward from the uppermost surface of the raw material layer.
  • a heat source was added to a position spaced 50 mm downward from the uppermost surface of the raw material layer, and 100 mm spaced downward from the uppermost surface of the raw material layer. Heat source was added to the location.
  • the intensity (Tumbler indux) of the sintered ore decreases as the depth of the heat source addition increases.
  • productivity is improved in the case of the second and third experimental examples (first and second embodiments) in which the heat source is added, compared to the first experimental example (the first comparative example) in which the heat source is not added. Able to know.
  • the productivity was lower than that of the first comparative example in which the heat source was not added. You can see the loss.
  • the heat source is added to the lower side of the uppermost surface of the raw material layer, but the heat source is preferably added up to a maximum of 100 mm from below the surface layer of the raw material layer. .
  • the maximum position to which a heat source is added does not become the point which exceeds 100 mm below the surface layer of a raw material layer.
  • a sintered raw material for preparing a sintered ore that is, a top light and a blended raw material is prepared.
  • the top light is a sintered ore with a small particle size of 2 to 3 mm among the already prepared sintered ore, and is not used for blast furnace operation, but is used as the top light at the time of processing of the next charge raw material.
  • the upper light facilitates the flow of the gas in the trolley 30 in the raw material processing process, and serves to protect the trolley made of iron material when the iron ore raw material is melted.
  • the blended raw material includes a secondary raw material including a binder containing lime (C), limestone or quicklime such as Fe-containing iron ore, powdered coke and anthracite.
  • the prepared upper light is transferred to the first hopper 14 and stored, and the blended raw material is stored in the storage bin 11 and then assembled in an assembly form in the granulator 12 and charged into the second hopper 15 for storage. do.
  • each of the plurality of trolleys 30 is sequentially moved from the lower side of the first hopper 14 to the lower side of the ignition furnace 20, and the upper light and the assembly are assembled to the trolley 30. Charge water and heat source sequentially.
  • the one truck 30 passes through the lower side of the first hopper 14, and the upper light is charged into the inside, and the upper light is charged.
  • the assembled vehicle 30 is charged by passing the lower side of the 2nd hopper 15.
  • bogie 30 moves from the left side to the right direction, charging to the desired height of a sintering raw material is completed from the right side to the left side of the trolley 30.
  • the lance 110 is located in the height corresponding to an upper layer part among the lower regions of the uppermost surface of a raw material layer, and the tip of the lance 110 is charged. Since it is located ahead of a predetermined distance from the point where it is completed or the charging completion point, a heat source is additionally supplied or added to the inside of the upper layer part L1 in the material layer in which charging is completed.
  • the lance 110 may be used to further add not only a heat source, but also a material containing an auxiliary material, such as CaO, as necessary.
  • the trolley 30 to which the heat source is additionally added to the upper layer part L1 is pressed by the operation of the pressing part 300 while passing through the lower part of the pressing part 300, and thus the charging density of the upper layer part L1 to which the heat source is added. Is improved. Since the trolley which passed the pressurizing part 300 passes through the lower side of the ignition furnace 20, the flame sprayed from the ignition furnace 20 is ignited on the raw material layer surface layer (top surface). The trolley 30 in which the flame is ignited moves in the direction in which the plurality of wind boxes 50 are arranged or in the direction in which the light distribution unit is located. The outside air is supplied into the trolley 30 by the suction force of the wind box 50 and is sucked. .
  • the flame gradually moves downward due to the movement of the trolley 30, whereby the sintering reaction proceeds from the upper side to the lower side of the raw material layer, thereby producing a sintered ore.
  • the trolley 30 reaches the windbox 50 position at the rear end, that is, the light distribution unit, when the flame reaches the bottom of the trolley or the bottom layer of the raw material layer, the flame is extinguished and sintering is completed.
  • the trolley 30 arriving at the end of 50) distributes the manufactured sintered ore, and the distributed sintered ore is cooled in a cooler.
  • the sintered ore thus produced is used as a raw material in the steelmaking process in the blast furnace.
  • the sintering reaction is performed from the upper side to the lower side of the raw material layer, that is, from the upper layer portion L1 to the lower layer portion L3.
  • the trolley 30 in which the flame is ignited passes the wind box 50, the flame or heat moves downward, and the sintered layer of the raw material layer is formed by air at room temperature introduced from outside after the flame ignition.
  • the temperature is lowered rapidly cooling.
  • the upper layer part L1 lacks heat and reaction time for the sintering reaction, and thus, unreacted sintered ore (that is, sintered ore in which iron ore is insufficient in reaction) is generated in the upper layer part L1, thereby decreasing the sintered ore production rate (or sintered ore). Increase in recovery) decreases.
  • the temperature of the upper layer portion L1 is increased by the added heat source, and the degree of temperature drop and the rate of temperature drop by air sucked from the outside are lowered.
  • the temperature in the upper layer portion L1 is higher than in the prior art, and the reaction time is increased compared with the conventional one, so that the upper layer portion L1 is sintered for a sufficient heat and reaction time, thereby increasing the sintered ore production rate in the upper layer portion L1.
  • the fine powder heat source is supplied to the upper layer part L1 from the lower side of the upper surface of a raw material layer using the lance 110 which concerns on 2nd Example.
  • the heat source or subsidiary material of the fine powder is supplied so as not to be exposed to the outside of the raw material layer, it is possible to minimize or prevent the generation of dust by the heat source or subsidiary material of the fine powder, thereby minimizing or preventing the environmental pollution problem. have.
  • the sintering apparatus and the sintered ore manufacturing method using the same it is possible to suppress or reduce the generation of unreacted sintered bundle in the upper layer and the generation of undersintered sintered ore in the lower layer.
  • a sintered ore having a uniform quality can be obtained regardless of the upper layer, the middle layer, and the lower layer or for the entire raw material layer.
  • the temperature in the upper layer is higher than in the prior art, and the reaction time is increased in comparison with the conventional, so that the upper layer is sintered for sufficient heat and reaction time. For this reason, the sintered ore production rate in an upper layer part can be improved.

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PCT/KR2016/014732 2016-07-29 2016-12-15 소결 장치 및 이를 이용한 소결광 제조 방법 WO2018021634A1 (ko)

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EP16910655.6A EP3492852A4 (en) 2016-07-29 2016-12-15 SINKING APPARATUS AND PROCESS FOR PRODUCING SINTERED ORE USING THE SAME
CN201680088014.0A CN109564065A (zh) 2016-07-29 2016-12-15 烧结设备和使用该烧结设备制造烧结矿的方法
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