KR20040057432A - A hopper dispersible the blast furnace return fine for the sintering process - Google Patents

Abstract

PURPOSE: A return ore hopper for sintering operation capable of sorting blast furnace return ore is provided to improve reactivity of the blended raw materials by supplying small blast furnace return ore as blended raw materials and large blast furnace return ore as hearth layer and improve recovery ratio of sintered ore by reducing consumption of sintered ore used as hearth layer. CONSTITUTION: In a return ore hopper(18) for sintering operation comprising an inflow part for flowing in blast furnace return ore transferred along belt conveyor(15), a discharge part for discharging the blast furnace return ore flown in, and a sorter installed between the inflow part and the discharge part to sort the blast furnace return ore per grain sizes, the return ore hopper is characterized in that the sorter comprises repulsion plates(19) for repulsing the blast furnace return ore after blast furnace return ore dropped from the belt conveyor is collided with the repulsion plates, and the discharge part comprises first discharge part(18a) for discharging small blast furnace return ore divided according to dispersion width of the blast furnace return ore dispersed after being collided with the repulsion plates into an ore bin for blended raw materials, and second discharge part(18b) for discharging large blast furnace return ore into a hearth layer hopper(3), wherein the sorter further comprises a sorting damper(20) installed at a branched part of the discharge part to flow small blast furnace return ore having small dispersion width into the first discharge part and flow large blast furnace return ore having large dispersion width into the second discharge part, and wherein the repulsion plates maintain an inclination angle of 60 degrees.

Description

A hopper dispersible the blast furnace return fine for the sintering process}

The present invention relates to a semi-optic hopper that can classify the blast furnace semi-reflected into the blending raw materials for the sintering industry and the top light in order to improve the recovery rate of the sintered ore, and more specifically, the blast furnace semi-reflective is not used in the blast furnace A sorting device is installed on the return line so that the blast furnace semi-reflected light can be supplied to the top light for sintering operation and the blast furnace semi-reflected light for sintering operation can be supplied to the blended raw materials based on the particle size of 5mm. It is about a classification hopper.

In general, the sintering process is a process of sintering the sintered raw material containing various iron ore and secondary raw materials and the blended raw material containing the powdered buncoke to produce a sintered ore for blast furnace charging.

That is, referring to FIG. 1, the compounding material charged in the hopper 1 is charged on the sintered trolley 2 via the inclined plate 5 by the rotation of the drum feeder 4. When the sinter truck 2 passes through the ignition furnace 6 while proceeding in the direction of the arrow A, the blended raw material is ignited by the flame of the ignition furnace 6 and at this time by the suction blower 7 As the blended raw material on the sintered trolley 2 is burned downward by air sucked into the lower portion, the sintering reaction proceeds to produce a sintered ore. Then, the air sucked through the wind (8) is collected in the electric dust collector 10 via the main exhaust pipe (9) and then discharged to the chimney (11).

On the other hand, the opposing top light is charged from the top light hopper 3 onto the sinter bogie 2 before the blended raw material is charged into the sinter bogie 2. The upper light is used to ore having a particle size of about 10 ~ 15mm by screening the sintered ore completed sintering, and typically contains about 15% of the ore having a particle size of about 5mm or less of the upper light.

FIG. 2 is a view schematically showing a pretreatment process of a raw material for sintering industry, in which limestone, silica, quicklime, and coke and semi-fluores used as fuels are primarily mixed in a drum mixer 12. After assembling secondary in the granulator 13, it is charged to the hopper 1 for blended raw materials. The ore having a particle size of about 10 to 15 mm collected as a result of secondary screening of the sintered ore is charged into the upper light hopper 3.

Semi-reflectives used for blended raw materials are divided into retrun fines generated in the sintering operation and blast furnace retrun fines generated in the blast furnace. Self-reflection refers to ore or microcrystalline light having a particle size of 5 mm or less among the sintered ores produced in the sintering industry. Therefore, the large amount of self-reflecting for blended raw materials means a low recovery rate of sintered ore.

On the other hand, it is preferable to thoroughly manage the particle size of the semi-reflected light generated by thoroughly managing the screen, but as a result, ore having a particle size of 5 mm or more in the self-reflected light is generated at a rate of about 3%.

In the blast furnace industry, the particle size management is relatively neglected in terms of securing air permeability in the blast furnace, so the ore having a particle size of 5 mm or more occupies a high rate of about 15 to 40% in the blast furnace semi-reflective compounding material.

That is, referring to Figure 3a, the blast furnace semi-reflective stored in the bunker (bunker) is introduced into the blast furnace semi-reflective hopper 17 through the belt conveyor 15 after passing through the vibrating feeder (14). . The blast furnace semi-glossy is temporarily stored in the semi-light hopper 17 and then deposited in the ore bin 16 through the belt conveyor. The blast furnace semi-glossy accumulated in the ore bin 16 is supplied to the drum mixer 12 (refer to FIG. 2) and blended as a blending raw material. Referring to FIG. 3B, the upper light screens the ore generated in the sintering operation as described above, and only the ore having a particle size of about 10 to 15 mm is stored in the upper light hopper 3.

However, as described above, when self-reflective or blast furnace semi-reflective particles having a particle size of 5 mm or more are used as the compounding material, in the sintering process, the reactivity of the compounding material having a large particle size is poor compared to that of the compounding material having a small particle size. There is a problem that it is quite disadvantageous.

The present invention has been made to solve the conventional problems as described above, based on the particle size of a predetermined size, for example, 5mm of semi-glossy, especially blast furnace semi-reflective used for the compounding material is a blast furnace semi-reflective for the compounding material It is possible to improve the reactivity of the blended raw materials by supplying the blast furnace semi-opposite of the confrontation and to classify the blast furnace semi-reflective for sintering operation which can improve the recovery rate of the sintered ore by reducing the amount of sintered ore used as the upper light. The purpose is to provide a semi-light hopper.

1 is a schematic representation of a conventional iron ore sintering process;

2 is a schematic representation of a conventional raw material pretreatment system;

3 is a schematic view showing a conventional blast furnace semi-treatment processing system;

4 is a schematic view of a semi-light hopper according to the present invention;

5 is a view showing the flow of the blended raw materials in the semi-gwang hopper according to the present invention.

<Description of Symbols for Major Parts of Drawings>

18: blast furnace light

18a, 18b: discharge section

19: Rebound

20: classification damper

In order to achieve the above object, according to the present invention, the blast furnace semi-reflected conveyed along the belt conveyor is introduced, the discharge portion for discharging the blast furnace semi-reflected, and the blast furnace semi-light between the inlet and the discharge In the semi-optical hopper for a sintering operation having a classifier for classifying each star, the classifier has a plate-shaped rebound plate capable of rebounding after the blast furnace semi-fall falling from the belt conveyor collides, and the discharge portion collides with the rebound plate. It is divided into a first discharge part for discharging the small blast furnace semi-glosses according to the dispersion width of the blast furnace semi-reflected to the ore bins for the blended raw material and a second discharge unit for discharging the blast furnace semi-opposite to the upper light hopper. do.

Best Mode for Carrying Out the Invention Preferred embodiments of the present invention will now be described with reference to the accompanying drawings, in which like components employ like reference numerals.

First, the semi-optic hopper 18 according to the present invention has an inlet part into which the blast furnace semi-reflected light is not used and returned from the blast furnace, and a storage part in which the blast furnace semi-reflected light is stored and a blast furnace semi-reflected light stored in the storage part.

The discharge part includes a first discharge part 18a for discharging the blast furnace semi-reflected to the ore bin 16 for providing the ore for blended raw materials and a second discharge part 18b for discharging the blast furnace semi-reflective light to the upper light hopper 3. .

On the other hand, the discharge end of the belt conveyor 15 is located at the inlet of the semi-light hopper (18). Therefore, the blast furnace semi-reflected light discharged from the bunker and conveyed along the series of belt conveyors 15 falls in the discharge end of the belt conveyor and flows into the storage portion of the semi-light hopper 18.

The storage unit is provided with a repelling plate 19 in which the blast furnace semi-reflecting collides with the falling through the discharge end of the belt conveyor 15, and the impact force of the blast furnace semi-collision colliding with the repelling plate 19 is applied to the particle size of the blast furnace semi-glomerate. The repulsion width of the blast furnace semi-reflective light which repels from the repelling plate 19 also differs according to the difference and the difference in the collision force.

And it can be seen that the repulsion width of the blast furnace semi-reflective light repelling from the repelling plate 19 is determined according to its particle size. That is, referring to Figure 5, the blast furnace semi-reflective conveyed by the belt conveyor 15 is moved at high speed via the vibrating feeder 14 until the belt conveyor (15) reaches the inlet of the semi-light hopper 18 The small particle size of the blast furnace semireflected light is located directly above the belt conveyor 15 by vibrating itself, and the blast furnace semireflected light of the large particle size is distributed on the blast furnace semi-reflective layer of small particles. Then, the blast furnace semi-reflected light flowing into the inlet of the semi-light hopper 18 via the discharge end of the belt conveyor 15 falls to the lower side by gravity. In this way, the blast furnace semi-reflecting light is repulsed and dispersed after colliding with the repelling plate 19, wherein the dispersion width of the blast furnace semi-reflective light varies depending on the particle size of the blast furnace semi-emissive. That is, the small blast furnace semi-reflected light has a small dispersion width, and the opposing blast furnace semi-reflected light has a large dispersion width. Accordingly, the small blast furnace semi-reflected light flows into the first discharge part 18a adjacent to the semi-repellent plate 19 and the second blast furnace semi-reflected light is relatively spaced apart from the semi-repellent plate 19. Flows into.

As described above, the classification damper 20 is provided at the branch of the semi-light hopper 18 where the discharge portion is branched to classify the blast furnace semi-glossy by particle size. The classification damper 20 has a base fixed on the branch and an extension part extending upward from the base to a predetermined height. Therefore, the small blast furnace semi-reflective light dispersed in the small dispersion width after colliding with the repelling plate 19 collides with the extension part of the classification damper 20 and enters the first discharge portion 18a and is dispersed in the large dispersion width. The blast furnace semi-reflected light flows into the second discharge portion 18b beyond the extension of the classification damper 20.

Since the blast furnace semi-optic light flowing into the second discharge part 18b enters the upper light hopper 3, the amount of sintered ore used as the upper light may be reduced. In addition, the blast furnace semi-reflected light flowing into the first discharge unit 18a and discharged into the ore bin 16 for the compounding material has a relatively small particle size, thereby improving the reactivity of the compounding material in the sintering operation.

In addition, according to a preferred embodiment of the present invention, the second discharge portion 18b may be used as a common discharge portion in the semi-light hopper 18 adjacent to each other. As a result, the sintered ore recovery rate can be increased by improving the ratio of blast furnace semi-reflective light used as upper light.

EXAMPLE

First, before the application of the semi-gwang hopper according to the present invention in the field, the blast furnace semi-particle size classification device was made as a reduced model to measure the classification efficiency of the blast furnace semi-glossy according to the semi-plate and the classification damper. In addition, when the blast furnace semireflected particles having a large particle size among the classified blast furnace semi-reflected particles are used as the sintered top light, and the small blast furnace semi-reflected particles having a small particle size are used as the sintered blending raw material, the sintering pot experiment is performed to change the sinter recovery rate. The experiment was performed.

Table 1 below shows the dispersion width of the blast furnace particle size according to the angular variation in the case of not using the repellent plate and when using the repellent plate.

[Table 1] Dispersion width according to particle size of blast furnace semi-glossy due to the change of rebound plate angle

No backing board 15 ° 30 ° 45 ° 60 ° 75 ° Dispersion Width (cm) 7.50 10.83 12.33 13.17 14.28 13.02

As shown in Table 1, it can be seen that the dispersion width of the blast furnace semi-glossy in the case of using a repellent plate compared to the case without a repellent plate. In addition, even when using a repellent plate, maintaining the angle of inclination of the rebound plate at 60 ° was excellent in increasing the dispersion width according to the particle size of the blast furnace.

The classification effect in each case also showed a significant difference, which is shown in Table 2 below.

Table 2. Classification efficiency of blast furnace semi-glossy due to the change of rebound plate angle

No backing board 15 ° 30 ° 45 ° 60 ° 75 ° Classification efficiency (%) 42 56 64 71 82 75

As a result of measuring the classification efficiency in each case, the classification efficiency was the best at 82% when maintaining the inclination angle of the rebound plate at 60 °.

In practice, it is the screen that is the best means of separating a specific particle size and at the same time exhibits a classification efficiency of more than 95%. However, in the case of screen type, when the particle size of 5mm or less is separated, the screening efficiency is excellent initially, but the screen is clogged after a certain period of time, and the efficiency is sharply lowered, even down to 50% or less.

In that sense, in terms of the maximum efficiency in the case of the use of the backing plate and the classification damper, it is lower than the screen type, but it can be said that it is an effective means of classifying the particle size in terms of the sustainability of the classification efficiency.

Therefore, as described above, the upper light generally uses a sintered ore having a size of 10 to 15 mm, but includes a plurality of particles having a particle size of 5 mm or less in terms of its use, and is classified by the blast furnace semi-light particle size classification according to the present invention. It is considered that no special problems will occur when blast furnace semi-reflective particles having a particle size of 5 mm or more are replaced with upper lights.

However, there is a limit to the use of blast furnace semi-glow with a small particle size compared to the upper light, the limit may be a time when the air permeability in the sintered bogie rapidly deteriorates.

Table 3 below shows the results of experiments on the results of fluctuations in the ventilation of the interior of the sintered trolley according to the use ratio of the blast furnace semi-light when the top light is replaced by the blast furnace semi-light.

TABLE 3

5% 10% 15% 20% 25% 30% 35% 40% Passage flow rate (㎥ / min) 1.25 1.25 1.24 1.24 1.24 1.23 1.10 1.03

As shown in Table 3, when more than 30% of the top light is replaced by the blast furnace, the air permeability decreases rapidly inside the sintered truck. .

Standard formulation of the raw materials used in the pot test is shown in Table 4, and the experiment was performed while varying the necessary parts according to the characteristics.

TABLE 4

Main raw material Iron Ore A 9.04 Raw materials SL.F 0.14 Coke 3.7 Iron Ore B 4.54 SP.F 1.65 Iron Ore C 5.98 PH.LM 9.68 Iron Ore D 3.95 BLM 1.12 Semi-gloss 25.0 Iron Ore E 25.81 Iron Ore F 10.40

The amount of coke used in the experiment was maintained at 3.7% and the ratio of half-light used was 25%. It was arbitrarily adjusted so that it became +5 mm (8%) and +5 mm (15%).

First, the experiment was performed according to the particle size variation of the semi-gloss under the conditions of the same coke (3.7%) and the same half-lens ratio (25.0%), and the experimental results are shown in Table 5.

TABLE 5

Semi-gloss +5 mm (0%) (ideal for semi-glow) Semi-gloss +5 mm (5.0%) (-2 for semi-glow) Semi-gloss +5 mm (8.0%) (-1 for semi-glow) Semi-gloss + 5mm (15.0%) (in typical sintering operation) productivity 39.2 39.5 38.8 38.1 And recovery rate 62.5 62.3 61.2 58.2 Character recovery rate 72.2 72.0 71.5 67.4 burglar 72.0 71.9 71.4 70.3 Coke Unit 56.9 57.2 57.9 61.4

As can be seen from Table 5, even when the same half-lens ratio is used, the larger the size of the semi-gloss is, the lower the productivity is, compared to the lower-grained side, and the yield and characteristic recovery rates are not only lowered, but also the strength is also lowered. On the other hand, in case of coke unit, the size of semi-gloss tends to be higher, which means that if the same fuel cost is used, the size of semi-gloss is relatively inefficient.

In general, the ratio of self-reflecting to blast furnace semi-reflectives is about 60 to 65% for semi-reflective based on total semi-reflective ratios, depending on the characteristics of the sinter plant. Accounted for about 35-40%. In the case of self-reflection, the + 5mm ratio is around 3%, while in the blast furnace semi-reflection, the + 5mm ratio is about 15 to 40%, so that + 5mm is about 15% in the typical sintering operation. .

However, the experiment was performed after adjusting the +5 mm ratio to 8% and 5%, respectively, in consideration of anticipated lowering of the particle size when the particle size control of the blast furnace was performed using the semi-glow particle size adjusting device as in the present invention.

As a result, when the total semi-glow particle size was reduced from the usual 15% to 8%, the productivity and the recovery rate tended to increase, and when the ratio thereof was reduced to 5%, the effect was even greater.

On the other hand, if the + 5mm ratio was 0% under the ideal condition that the screen efficiency was 100%, the recovery rate and strength tended to increase slightly compared to the + 5mm 5% case, but due to the relatively thinning effect. Therefore, the air permeability in the sintered bed is lowered and the sintering time is increased, thereby resulting in a slight decrease in productivity.

As a result, it can be seen that an appropriate semi-glow particle size use condition is approximately +5 mm ratio of about 3 to 5% of the total semi-gloss.

Substantially, the use of the blast furnace semi-granular particle size classification apparatus used in the present invention makes it possible to set the ratio of 5 mm or more in the blast furnace semi-reflectors used for sintering to about 8%, and the +5 mm ratio of the semi-glosses used is approximately 5% We believe this will be an effective tool in terms of sintering productivity and recovery.

In the present invention, by controlling the particle size of the blast furnace semi-adjustment to adjust the particle size of the entire semi-precision used as the sintered compounding material to -5mm (in this case, + 5mm ratio of about 5%) to enhance the reactivity in the sintered bogie when using the same coke The recovery rate can be improved.

In addition, since it is possible to replace a part of the conventionally used upper light to the blast furnace semi-reflective light can be used in the blast furnace as much as the replacement ratio, which has the effect of enabling a role such as increased recovery of the sintered ore.

By improving the reactivity in the sintered trolley by controlling the particle size of the blast furnace, even if the amount of coke, a fuel used for sintering, is reduced, the sintering operation can be performed without adversely affecting the quality and properties of the sintered coal, thereby reducing the coke. .

The foregoing is merely illustrative of the preferred embodiments of the present invention and those skilled in the art to which the present invention pertains recognize that modifications and variations can be made to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims. shall.

Claims (3)

In the semi-optic hopper for the sintering operation having an inlet portion into which the blast furnace semi-transmission is carried along the belt conveyor, an outlet for discharging the introduced blast furnace semi-glomerate, and a classifier classifying the blast furnace semi-glomerates by the particle size between the inlet and the outlet. In The classifier has a plate-shaped rebound plate capable of repulsion after blast furnace rebounds falling from the belt conveyor collide, The discharge unit discharges the blast furnace semi-array of the first discharge unit and the opposing blast furnace semi-emissive to the upper light hopper by discharging the small blast furnace semi-reflected according to the dispersion width of the blast furnace semi-dispersion after impinging on the reaction plate. Semi-light hopper which can classify blast furnace semi-glossy for sintering operation characterized by branching to 2nd discharge part. The method of claim 1, Sintering characterized in that it further comprises a classification damper provided in the branch portion of the discharge portion to guide the blast furnace semi-reflective particles having a small dispersion width to the first discharge portion and the blast furnace semi-reflective particles having a large dispersion width flow into the second discharge portion. Semi-light hopper which can classify blast furnace semi-optic for operation. The method of claim 1, The semi-glossy hopper can classify the semi-reflective blast furnace for sintering operation, characterized in that to maintain the inclination angle of 60 °.