KR100405520B1 - Charging method of sized ore for blast furnace - Google Patents

Abstract

The present invention relates to a method of classifying opposing and small grains by classifying grained ore used as molten iron raw material of blast furnace, and more specifically, classifying and basis weight of spectroscopic and lumped minerals contained in grained ore by opposing and small grain of sintered ore, respectively. The present invention relates to a method for sorting and charging sintered grained light for blast furnaces. The present invention relates to classifying grained light charged in blast furnaces by particle size and selectively granulating the grained light in a plurality of sintered ore storage tanks. The first particle size selection step of screening the particle size of 8mm or more into alleles and small particles again, and after the screening and completion of the basis weight, the particle size selector is appropriately timed to remove the grained light and foreign matter attached by the moisture and fine powder contained in the grained light. Idling during the step, and the opposed standing light is discharged to the distal end of the sintered ore to discharge the mixed light. And a second particle size sorting step of sorting the particle size by storing the mixed discharge step and the small particles of the sized light in a specific storage bin through a plurality of small sized light conveying conveyor belts through the particle chute of the particle size sorting device. Mixing the granulated grains with the sintered ore and basing the granules; in the process, putting the opposing grains into the top loading hopper and charging them into the middle part at the time of loading, the small grains mixed at a predetermined ratio with the small grains are exposed The charging step consists of charging the first notch in the furnace wall.

Description

Method of division charging of smelting grain light for blast furnace {CHARGING METHOD OF SIZED ORE FOR BLAST FURNACE}

The present invention relates to a method of classifying opposing and small grains by classifying grained ore used as molten iron raw material of blast furnace, and more specifically, classifying and basis weight of spectroscopic and lumped minerals contained in grained ore by opposing and small grain of sintered ore, respectively. It is about the division charging method of the smelting grain light which can be charged to blast furnace.

In general, sized lump, which is iron ore used as a main raw material in a blast furnace, is imported or imported from overseas. As shown in FIG. After the crushing treatment, 10 ~ 50mm grains of more than 8mm are dispersed and stored in specific tanks among several storage tanks to be used as raw materials for the molten iron used in the blast furnace.

In this way, the grained light stored in each bin is weighed in an appropriate amount into a hopper of about 25 tons installed in the bottom of the bin, and finally charged into the blast furnace after distribution.

The method for charging the blast furnace by particle size is to repeat the order of COKE 1CHARGE, allelic ore 1CHARGE, central coarse 1CHARGE, small particle ore 1CHARGE in order, and this charging amount is called the primary charge of charge, and the particle size of iron ore is classified and loaded. Star charging.

The above process is called the basis weight process of the set value of fuel and iron ore required in the blast furnace. In order to load the fuel and raw material into the blast furnace in this way, the basis weight is completed to transfer through the charging belt conveyor (1). It is kept in the standby state, and imported to the charging hopper (2) of the furnace government to wait.

This is because when the charging reaction of the iron ore charged into the blast furnace after a certain time has elapsed, the charged charge falls into the charging hopper 2 to reach the charging baseline and continuously according to the charging start signal. It will be charged.

The charge is charged through a rotation chute (3) located in the center of the furnace part by dividing the furnace wall part into a reference point to the center of the blast furnace to 1 to 2 notch in a radial direction.

Allotropically sintered ore is charged uniformly in the radial direction to form a soft fusion zone with excellent breathability and gas utilization rate, and a small sintered ore with excellent reducing and breathability is seated on the furnace side to prevent the formation of inert zones of the furnace wall and induce the protection of the furnace wall. Charging alternately from the top.

On the other hand, allelic sintered ore among the sintered ores distributed and stored in eight sintered ore storage tanks 4 through the sintered ore feeder is sorted by a particle size sorter up to a particle size of 12 to 30 mm, and after the particle size is selected, the ore along the allied light emission display line 5 is selected. Weighing hopper (6) After weighing a certain amount in 8 tanks and dispersing and storing it in 8 tanks, two opposing ore surge hoppers, which are the final storage tanks that collect the inputs into the blast furnace after weighing the basis weight through a particle size sorter (7) is temporarily distributed and stored.

As such, the ore in the state where the small particles and the spectroscopy are combined with the small particle indicator line 8 after the particle size selection is divided into small size ora storage bins by a plurality of return transfer belt conveyors 9a, 9b, 9c, and 9d installed below. (small size ore hopper), the small particle 10 is subjected to the screening process through the particle size sorter 11 to a particle size of 5 ~ 12mm.

Conventionally, one or two of eight sub-material bins are selected and temporarily stored in a grain storage tank. The characteristics of the grains are the selection or sintering of ore by particle size, and grains having a particle size of 10 to 50 mm are mainly used in blast furnaces. It should be used, but all of them are put into the blast furnace without distinguishing them from the very fine grains to about 50mm, and the large amount of powder is used to induce ventilation resistance inside the furnace, that is, the middle part of the furnace. Unbalanced gas flow makes it very difficult to operate such as the temperature increase of the furnace wall.

Meanwhile, the grained light discharged from the storage tank 4 of the grained light is introduced into the final ore hopper 12 through a feeder provided at the bottom, which is fixed at the bottom of the feeder because it contains a large amount of water and small particles. There is a problem that can be replaced by a constant sintered ore and use of the mixed sintered ore can not cause a problem of basis weight.

The present invention has been invented to solve the above problems, the present invention in consideration of the characteristics of the large amount of water and small particles in the nature of the sizing light to distinguish the alleles and small particles through the smallest particle size sorting device by Differentiation of grain sized grains by classifying and classifying the grains improves air permeability in the middle of the blast furnace, and small grains classify the smelting grains for blast furnace smelting which can improve productivity by promoting the yellowing stability under high feed-out ratio operation through stabilization of the furnace wall. The purpose is to provide.

In order to achieve the above object, the present invention classifies and loads the grained light charged into the blast furnace by particle size, and selectively grains the grained light into a plurality of sintered ore storage tanks, and selects grain sizes of 8 mm or more into opposing and small grains. 1) the particle size sorting step, and after the screening and completion of the basis weight, the step of idling the particle size sorter for an appropriate time in order to remove the particles and foreign matter adhered by the moisture and fine powder contained in the sizing light, A mixed discharge step of mixing and discharging the sintered ore at the distal end of the sintered ore and discharging the sintered ore is stored in a specific storage bin through a plurality of small particle transfer conveyor belts through a split chute of a particle size sorting device. A second particle size selection step of screening, and mixing the final screened fine grained light with a sintered ore and the basis weight, In the above process, the opposing charges of the grains are put into the top loading hopper and charged into the middle part during charging, and the small grains mixed in a predetermined ratio with the small grains are charged into the first notch part of the furnace wall when the loading into the top loading hopper. It is made up of steps.

1 is a schematic view for explaining the process of the state charged into the blast furnace in a general method,

Figure 2 is a perspective view showing a typical standing light basis weight,

3 is a schematic view for explaining a state of charging in the standing light basis weight method according to the present invention,

Figure 4 is a plan view of a standing light divided charging state according to the present invention.

<Description of Symbols for Main Parts of Drawings>

9a, 9b, 9c, 9d: small particle transfer conveyor belt

11: particle size sorter 20: sintered ore storage tank

Hereinafter, described in detail with reference to the accompanying drawings showing the present invention.

Screen loading of grain size by particle size is selectively performed when it is necessary to replace the sintered ore during the major or heavy repair period when the sinter ore supply and supply of the sinter plant is unsatisfactory.In addition, the grain loading for pellet supply is additionally performed. Will be done even if needed.

In the first particle size sorting step in which grains are sintered in a specific sintered ore storage tank 20 and the grain size of 8 mm or more is again selected, the grain size of the grain size sorting device screen of the storage tank is included because the grains contain a large amount of moisture and fine powder. After this, the discharge damper 4a of the standing light storage tank is completely closed while idling for a predetermined time while the attached light or foreign matter is cleaned on the upper mat of the particle size sorter and the separation caused by the idling impact of the ore stuck in the pastoral part. Induction increases the efficiency of screen size selection in the basis weight of the next standing light.

The reason for the idling of the screen in the above step is because there is a lot of moisture and fines in the grained light, so if you do not go through the above-mentioned process, there is no meaning of distinguishing the particle size into small particles. It must be done.

In addition, the opposite grained light is mixed so as to be discharged to the tip end when the opposed light of the sintered ore is discharged. The reason why the mixing is required in the mixed discharge step is that the grained light has a small particle size and includes a lot of round shapes depending on the shape. In particular, when discharging the opposing light of the sintered ore, the eight wafer hoppers 12 are discharged from the eighth hopper hopper and are loaded on the lower conveyance belt 13 in order.

Therefore, the 8th hopper hopper opposing light on the first hopper side is the distance per hopper (approximately 4 meters) in consideration of the traveling speed of the belt (about 2 meters per second), and the arrival time is 16 seconds later. Opening the lower gate allows the opposing light tip of the eighth hopper to pass through the bottom of the first hopper.

At this time, the grain size of the allele having the particle size selected in the first hopper is discharged to the lower portion and is discharged to the tip of the upper portion of the allele of the thick sintered ore so that the mixing is possible and the gap between the grain sizes of the allele is large. As the opposing light of the standing light is filled up, it is possible to additionally prevent the fall of the cloud caused by the cloud to the bottom during the conveyance of the belt.

The particle size of the grain size is the second particle sorting to store the minute chute of the particle size selection device in a specific storage bin through the small particle transfer conveyor belt (9a) (9b) (9c) (9d) of the sintered ore Will perform the steps.

Finally, the fine-grained granulated light selected as described above is mixed with the small particles of the sintered ore to perform a basis weight. In this process, the opposing grains are charged into the top loading hopper 2 and charged into the middle part 20 during charging. In the step of charging, as shown in FIG. 4, the charging is carried out in the 4-9 notch section, which is the middle part of the furnace. At this time, since the standing light of the opposition is already mixed constantly, the interior of the furnace can be secured when the middle part of the furnace is charged. Internal gas flow imbalances can be prevented, and in the case of high shipping costs, the middle part of the injection should be restricted.

In addition, when the sintered ore mixed at a predetermined ratio with the small particles is loaded into the top loading hopper, the charging section 2, 3, 4 notch inside the furnace in step 21 is charged into the first notch portion of the furnace wall as shown in FIG. In the case of charging by setting the charging section, the temperature of the furnace wall is increased by changing the number of revolutions per notch of the charge turning chute 12 in consideration of the situation of the yellowing at that time. To prevent it.

Depending on the characteristics of the grains, there is a large amount of water and small particles, so the smallest and smallest particle size sorting devices are used to classify the small and small grains and classify them into the opposing and small grains of the sintered ore. It is a very useful invention that can improve the productivity by improving the yellowing stability under the operation of the high ship cost ratio through the temperature stability of the furnace wall part.

Claims (1)

In classifying and charging the grained light charged to the blast furnace by particle size, Selectively granulating the sintered light into a plurality of sintered ore storage tanks 20 to select a particle size of 8 mm or more into antagonists and small particles again, and by the moisture and fine powder included in the sintered light after the selection and the basis weight A step of idling the particle size selector 11 for a predetermined time in order to remove attached grains and foreign matters, and a mixed discharge step of mixing the grains of the grains by discharging them at the tip when discharging the grains of sintered ore; The second particle size sorting is performed by storing the grains of the grains in a specific storage bin through a plurality of small grain conveying belts 9a, 9b, 9c, and 9d through a split chute of a particle size sorting device. And a step of mixing the final sorted fine grained mineral with a sintered ore and carrying it out, and putting the opposing grains into the top loading hopper in the above process, Phase, therefore the light nine minutes sizing method for charging, characterized by a small particle is made of an optical stage of the first furnace charged to the furnace wall in the entrance section tooth portion exposed charging hopper water mixed at a predetermined ratio with the small particle light.