KR20120020355A - Method for reducing return sinter fines - Google Patents

Method for reducing return sinter fines Download PDF

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Publication number
KR20120020355A
KR20120020355A KR1020100083927A KR20100083927A KR20120020355A KR 20120020355 A KR20120020355 A KR 20120020355A KR 1020100083927 A KR1020100083927 A KR 1020100083927A KR 20100083927 A KR20100083927 A KR 20100083927A KR 20120020355 A KR20120020355 A KR 20120020355A
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KR
South Korea
Prior art keywords
sintering
surface layer
sintered
ignition
compounding material
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Application number
KR1020100083927A
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Korean (ko)
Inventor
박관욱
윤성섭
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현대제철 주식회사
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Priority to KR1020100083927A priority Critical patent/KR20120020355A/en
Publication of KR20120020355A publication Critical patent/KR20120020355A/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • 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
    • 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
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases, or liquids

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention relates to a method for reducing sintered semi-reflective light, comprising the steps of charging a sintering compound (M) for sintering into the sintering machine (10) through a charging hopper (11), and igniting the furnace (15) of the sintering machine (10). Thereafter, the step of performing the surface layer long press-fitting to squeeze the surface layer portion of the sintering compounding material (M) to prevent the lifting or cracking of the surface layer of the sintering compounding material by the suction air of the air blower (17).
In the present invention, since the surface layer portion of the sintered compound is pressurized by using a rolling roll installed at the rear end of the ignition furnace after ignition of the sintering machine, the generation of sintered glow is reduced. Therefore, there is an advantage that the recovery rate of the sintered ore is increased.

Description

Method for reducing return sinter fines}

The present invention relates to a sintered semi-reflective method, and more particularly, to a sintered semi-reflective method for reducing sintered semi-reflective light generated in the sintering process.

Since the main reaction of the blast furnace is a reduction reaction by CO gas, it is important to ensure the air permeability of the charge layer in order to smooth the furnace reaction.

Therefore, blast furnace charges, including iron ore, should have an appropriate particle size, especially in the case of iron ore, since more than 80% is calculated as iron ore worldwide, sintered ore sintered such iron ore is used.

Briquetting methods include sintering and pelletizing. The sintering method is a method of sintering using coke combustion by suction air, and the pelletizing method is a method of adding a caking additive to fine spectroscopy, granulating it into pellets, and then firing.

It is an object of the present invention to produce a sintered ore by applying the sintering method, to provide a sintered semi-reflective reduction method to reduce the sintered reflection generated in the sintering process by preventing the surface layer lifting through the surface layer compression of the raw material for sintering after sintering the sintering machine It is.

According to a feature of the present invention for achieving the object as described above, the present invention comprises the steps of charging the sintering compounding material into the sintering through the charging hopper; After ignition by the ignition of the sintering machine, the step of performing a surface layer long press-fitting to compress the surface layer portion of the sintering compounding raw material to prevent the lifting or cracking of the surface layer of the sintering compounding material by the suction air of the blower.

The surface layer long pressing is performed by a pressing roll provided at the rear end of the ignition furnace.

When pressing the surface layer long press-fitting range is 1.0 ~ 2.0% of the height relative to the height of the raw material for sintering.

According to the present invention, a press-down roll is installed at the rear end of the sintering furnace and ignited by the ignition of the sintering machine. After ignition, the indentation of the surface layer of the blended raw material for sintering is weakened by the strong air volume of the blower to induce bonding between the excited surface layer and the upper part of the glowing layer to strengthen the surface layer of the blended raw material for sintering.

Therefore, there is an effect that the sintered semi-reflectance of the sintering process is reduced and the productivity of the sintered ore is increased.

1 is a block diagram showing a sintering apparatus employing the sintered semi-reflective method of the present invention.
Figure 2 is a graph comparing the sintered ore productivity with and without the sintered semi-reflective method of the present invention.
3 is a graph comparing the recovery of sintered ore when and when not applied to the sintered semi-reflective method of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described in detail.

The method for reducing the sintered semi-reflective light of the present invention includes charging the sintered compounding material through the charging hopper into the sintering unit, and performing surface layer long press-fitting to compress the surface layer portion of the sintered compounding material after ignition by ignition of the sintering machine. .

Blended raw materials for sintering include iron ore, secondary raw materials, powdered coke and the like. As shown in Figure 1, the sintered compounding material (M) is charged to the sintering machine trolley 13 through the charging hopper 11, after the ignition process 15 of the sintering machine 10 after the ignition process The combustion of the blended raw material layer for sintering proceeds downward by the suction air of the lower air blower 17, and sintering is performed.

The charging hopper 11 is an intermediate storage tank for charging the sintering compounding material M evenly into the sintering machine trolley 13, and the blower 17 is disposed below the sintering machine trolley 13 to be sintered compounding raw material. It is a device which burns downward by the apparatus which forcibly inhales air to (M).

Sintered ore discharged by sintering is sintered ore of appropriate size (about 6 ~ 20mm) through the process of primary crushing-sieving-cooling-secondary crushing-sieving. The produced sintered ore is charged to the blast furnace.

The sintering machine 10 is a generic term for equipment for sintering a compounding material for sintering and includes a sintering machine trolley 13, an ignition furnace 15, a blower 17, and the like. The ignition furnace 15 is an apparatus for igniting the surface layer of the compounding material M for sintering charged in the sintering machine trolley | bogie 13.

The high temperature sintered ore (about 800 ° C.) discharged from the sintering machine 10 and completed with primary crushing and sieving is forcedly cooled to 100 ° C. or less through cooling. The cooled sintered ore is produced by sintered ore of appropriate size through secondary crushing and sieving.

Sieving is a process of classifying sintered semi-reflective light of 5mm or less generated during the sintering process using a sorting machine. Since sintered semi-reflecting impairs the air permeability of the furnace when it is charged into the blast furnace, it is not actually used in blast furnace operation but is mixed with the raw materials for sintering and reused for the production of sintered ore.

If the amount of sintered reflection is high, the production of sintered ore that can be used in the blast furnace operation is reduced, so the sintered reflection should be minimized.

As a result of the experiment, sintered semi-reflective light is generated in the sintering machine bogie side part and the upper layer part after ignition of the sintering machine ignition furnace. This is because combustion of the raw material layer for sintering proceeds by the suction air of the blower 17 after ignition of the ignition furnace 15, so that the surface layer portion is opened or cracks are generated due to the strong air volume to generate an unbaked sintered ore.

In order to minimize the sintered reflection, when the surface layer portion of the sintered compounding material M is ignited after ignition of the sintering furnace 15 of the sintering machine 10, the surface layer portion of the sintered compounding material M is squeezed and weakened by the strong air volume. To induce bonding of the top of the glowing layer.

The glowing layer corresponds to the central part based on the height of the sintering compound (M) charged in the sintering machine bogie and holds a large amount of heat. The glowing layer has a large amount of heat, so when the surface layer is compressed, it is easily combined with the surface layer.

As shown in FIG. 1, the surface layer long press injection is performed by a pressing roll 19 provided at the rear end of the ignition furnace 15. The rolling roll 19 is configured to be supported by a frame (not shown) so that the surface layer portion of the sintered compounding material M sintered at the rear end by ignition can be press-fitted.

The surface layer long press-in of the compounding material for sintering by the rolling roll 19 can be implemented adopting the structure of a general rolling roll. For example, the press-down roll 19 can press-fit the surface layer part of the sintering compounding material M by the piston-type hydraulic means which pushes a roll-down roll toward the sintering machine trolley | bogie 13 direction.

The press-down roll 19 compresses the surface layer portion of the sintering machine compounding material M after ignition to reinforce the surface layer portion, thereby preventing surface layer tempering and cracking due to the strong air volume of the blower 17 generated during ignition.

The roll down roll 19 is provided at the rear end of the ignition furnace 15 so as to press-fit the surface layer portion of the sintering compound raw material M at the time when the sintering compound material M passes through the ignition furnace 15. .

When the pressing roll 19 is installed at the front end of the ignition furnace 15 to long press the surface layer portion of the compounding material M for sintering, it is difficult to prevent the surface layer portion lifting or cracking occurring after the ignition. The front end of the ignition furnace corresponds to a section before the sintering compounding material M enters the ignition furnace 15.

When pressing the surface layer long press-fitting range is 1.0 ~ 2.0% of the height of the sintering compounding material (M) charged in the sintering machine trolley (13). For example, assuming that the height of the compounding material for sintering charged into the sintering machine trolley 13 is 20 cm, the crimping range is to compress the height of the material for sintering compounding to be 16-18 cm.

When the compression range is 1.0% or less of the height of the sintered compounding material (M), the bonding force between the surface layer portion of the sintered compounding material (M) and the upper portion of the glowing layer is low, and thus the sintered reflection is not generated. Rather, cracks may occur in the sintered ore. Cracking of sintered ore increases sintered reflection. When the sintered semi-reflective light is reduced, the recovery rate of the sintered ore increases.

1 and 2 are compared with the case where the pressure reduction roll is installed at the rear end of the ignition furnace, and the sintered ore is manufactured by performing the surface layer long press-in of the raw material for sintering after ignition. .

As shown in FIG. 1 and FIG. 2, there was no difference in productivity when the surface layer long press was performed and when the sintered ore was manufactured without performing the surface layer long press. On the other hand, in case of sintered ore recovery rate, long press-in of the surface layer part was high.

The recovery rate is calculated from the difference between the total sintered ore output and the sintered semi-glossy which is 5 mm or less.

Through this, the roll down roll is installed at the rear end of the sintering furnace, and after the ignition by the ignition of the sintering machine, the press-down roll is used to perform surface press-fitting in a range of 1.0 to 2.0% of the height of the raw material for sintering. It can be seen that the method can improve the recovery rate without lowering the productivity.

The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention, which is understood to be included in the configuration of the present invention.

M: Sintering Compound Raw Material 10: Sintering Machine
11: Charging hopper 13: Sintering machine balance
15: Ignition furnace 17: Fan
19: Abhalol

Claims (3)

Charging the sintering compounding material into the sintering unit through the charging hopper;
After ignition by ignition of the sintering machine, the surface layer portion press-fitting to squeeze the surface layer portion of the compounding material for sintering so as to prevent the lifting or cracking of the surface layer of the compounding material for sintering by suction air of the blower is characterized in that it comprises a step of pressing. Sintered semi-reflective reduction method. The method according to claim 1,
The surface layer long press-fitting is performed by a rolling roll provided at the rear end of the ignition furnace. The method according to claim 1 or 2,
When the surface layer long press-in the pressing range is sintered semi-reflective method, characterized in that the range of 1.0 ~ 2.0% compared to the height of the raw material for sintering.
KR1020100083927A 2010-08-30 2010-08-30 Method for reducing return sinter fines KR20120020355A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230081236A (en) 2021-11-30 2023-06-07 주식회사 신일 Building-integrated photovoltaic module fixing device
KR20230100371A (en) 2021-12-28 2023-07-05 손승호 Building-integrated photovoltaic module fixing device with earthquake-resistant structure
KR20230100366A (en) 2021-12-28 2023-07-05 손승호 Heat-dissipating building-integrated photovoltaic module fixing device
KR20230100346A (en) 2021-12-28 2023-07-05 손승호 Building-integrated solar module protection and fixing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230081236A (en) 2021-11-30 2023-06-07 주식회사 신일 Building-integrated photovoltaic module fixing device
KR20230100371A (en) 2021-12-28 2023-07-05 손승호 Building-integrated photovoltaic module fixing device with earthquake-resistant structure
KR20230100366A (en) 2021-12-28 2023-07-05 손승호 Heat-dissipating building-integrated photovoltaic module fixing device
KR20230100346A (en) 2021-12-28 2023-07-05 손승호 Building-integrated solar module protection and fixing device

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