KR102533807B1 - Manufacturing method of sintered ore - Google Patents

Abstract

Proposed is a method for producing sintered ore that can prevent a decrease in productivity of sintered ore after sintering, even when granulation properties are improved by adding ultrafine powder to the sintering and blending raw material at the time of granulation of the sintered ore. A method for producing sintered ore in which sintered ore is obtained by granulating sintering and blending raw materials containing iron ores of a plurality of brands with a granulator and firing the obtained granulated raw material for sintering with a sintering machine, wherein the sintering and blending raw material has a particle size of 10 μm or less The majority of ultrafine powder raw materials are blended to increase the particle diameter of 10 μm or less in the total amount after blending by 1 to 10 mass%, and when the sinter and blend materials are granulated, the powder coke carry out addition.

Description

Manufacturing method of sintered ore

The present invention is a method for producing sintered ore, which is a raw material for a blast furnace, in particular, a sintered ore characterized in that the sintered ore is produced using a sintering blending material prepared by paying attention to the particle characteristics of the sintering blending material provided for granulation. It's about manufacturing methods.

A sintered ore is normally manufactured by the following process. First, powdered iron ore (generally, what is called sinter feed of about -10 mm) composed of a plurality of brands, supplementary raw material powder such as limestone, silica stone, and serpentine, and miscellaneous raw material powder such as dust, scale, and semi-mineral, , solid fuel such as powdered coke is blended in an appropriate amount to obtain a raw material for sintering and blending. Next, water is added to the obtained sintering and blending raw materials. Then, the raw materials for sintering and blending with water added thereto are mixed and granulated to obtain granulated raw materials for sintering. Next, sintered ore is obtained by inserting the obtained granulated raw material for sintering into a sintering machine and firing it. The raw materials for sintering and blending generally aggregate with each other during granulation due to the inclusion of water to form quasi-particles. And when this quasi-particled granulated raw material for sintering is charged on the pallet of a sintering machine, it helps to ensure good ventilation of the raw material loading layer for sintering, and the sintering reaction proceeds smoothly.

In the manufacturing method of the sintered ore mentioned above, various methods of improving the granulation property by adding a micronized or ultra-micronized raw material to a raw material for sintering, which is difficult to granulate, have conventionally been proposed. For example, Patent Document 1 discloses a method for producing sintered ore in which porous iron ore in a raw material for sintering is pulverized to a particle size in which 15% or more of fine powder having a particle size of 45 μm or less is contained. In addition, Patent Document 2 discloses a method for producing sintered ore using finely ground raw materials including iron ore whose particle size is adjusted by partially pulverizing to 10 μm or less and pellet feed. Further, Patent Literature 3 discloses a method for pre-treating raw materials for sinter in which, when kneading the raw materials for sinter, fine particles having a particle size of 10 μm or less are added and kneaded. Furthermore, Patent Document 4 discloses a method for producing a raw material for sintering, in which a pellet feed is granulated by a hand-shaped mill having a predetermined configuration, and as a part thereof contains ultrafine particles having a particle size of 10 μm or less.

In addition, the particle size in this embodiment is the particle size obtained by sieving using a sieve with a nominal grid interval conforming to JIS (Japanese Industrial Standards) Z 8801-1, for example, a particle size of 4 mm or less means JIS Z It refers to the particle diameter at which the entire amount passes through a sieve with a nominal grid interval of 4 mm based on 8801-1, and is also described as -4 mm. In addition, the minimum value of the nominal grid interval stipulated by JIS (Japanese Industrial Standards) Z 8801-1 is 20 µm, and when smaller than that, for example, 10 µm or less, laser diffraction/scattering method conforming to JIS Z 8825 or , means a particle size in which the integrated fraction of a particle size of 10 μm or less determined by the liquid phase gravity sedimentation method in accordance with JIS Z 8820-2 is approximately 100%.

Japanese Unexamined Patent Publication No. 2007-138244 Japanese Unexamined Patent Publication No. 2013-32568 Japanese Unexamined Patent Publication No. 2012-162796 International Publication No. 2013-54471

However, in these methods, only specific ores are treated, and the relationship between undifferentiated ores other than specific ores and undifferentiated or ultra-differentiated raw materials added to improve granulation properties is not considered. Therefore, when granulating such a raw material for sintering and blending, there was a problem that the combustibility of the coke powder was inhibited and the productivity of the sintered ore after sintering decreased.

An object of the present invention is to manufacture a sintered ore capable of preventing a decrease in the productivity of the sintered ore after sintering, even when the granulation property is improved by adding an ultra-fine raw material to the sintering and blending raw material at the time of granulation of the sintering and blending raw material. It is to suggest a way.

As a result of intensive examination of the problems of the prior art described above, the inventors have found that while optimizing the addition amount of the ultrafine powder raw material added to the sintering blending raw material, quasi-particles covered with powder coke are used as granulated raw materials for sintering. By using as, it was found that the decrease in productivity of the sintered ore after sintering could be prevented, and the present invention was developed.

That is, the present invention is a method for producing sintered ore in which sintered ore is obtained by granulating sintering and blending raw materials containing iron ores of a plurality of brands with a granulator and firing the obtained granulated raw material for sintering with a sintering machine. The majority of ultrafine powder raw materials are blended to increase the particle diameter of 10 μm or less in the total amount after blending by 1 to 10 mass%, and when the sinter and blend materials are granulated, the powder coke It is a manufacturing method of the sintered ore characterized by performing addition.

In addition, in the manufacturing method of the sintered ore according to the present invention constituted as described above,

(1) that the time from the addition of the powdered coke to the end of the granulation is 30 to 120 seconds;

(2) In the granulation of the sinter blending raw materials, the limestone or semi-ore is added after the start of granulation of the sinter blending raw materials other than powdered coke and limestone or semi-ore, but before the addition of the powdered coke;

(3) as the powder coke, using powder coke having a pore size of 10 to 120 μm of 0.40 cc/g or more;

(4) the assembly is carried out using only a drum mixer;

It is thought that this becomes a more preferable solution.

According to the method for producing sintered ore according to the present invention, the ultrafine powder raw material having a particle diameter of 10 μm or less is the majority, and the particle diameter of 10 μm or less in the total amount after blending is increased by 1 to 10 mass%, and the sintered blend raw material is granulated In this case, by adding coke powder in the middle of granulating sintering and blending raw materials other than powder coke with a granulator, granulation properties can be improved by ultra-fine raw materials, and combustion of powder coke can be promoted, so that the It becomes possible to improve productivity.

1 : is a flow chart for demonstrating an example of each process in the manufacturing method of the sintered ore of this invention.
2 : is a flowchart for demonstrating another example of each process in the manufacturing method of the sintered ore of this invention.
3 : is a figure for demonstrating the structure of an example of the sintered ore manufactured according to the process of FIG.
4 : is a figure for demonstrating the structure of an example of the sintered ore manufactured according to the process of FIG.
Fig. 5 is a graph showing the relationship between the production rate and the exterior time based on the data in Tables 1-1 and 1-2.
Fig. 6 is a graph showing the relationship between the comparative production rate with 0% of the ultrafine powder raw material and the exterior time, based on the data in Tables 1-1 and 1-2.
Fig. 7 is a diagram for explaining a method of obtaining an air permeability index JPU.

<About development of the present invention>

In the present invention, when an ultrafine powder material containing a majority of ultrafine particles is added to the sinter blend material, the cause of the inhibition of combustion of the sinter blend material in sintering is the ultrafine powder for powder coke serving as a heat source in sintering. I came to think of it as the coating of the particles. Here, ultrafine particles refer to fine particles having a particle size of -10 μm or less (here, a particle size of 10 μm or less), and are not defined by components or the like. Since these particles have a small particle diameter, the specific surface area is increased, and there is an effect of increasing the number of contact points between the particles. Therefore, the ultra-fine particles have high adhesiveness, and by adding them at the time of granulation, there is an effect of improving the granulation property.

On the other hand, ultrafine particles can enter open pores of other particles. For example, the powdered coke used in the present invention contains 0.54 cc/g of -100 µm open pores and 0.11 cc/g of -10 µm open pores, as an example. Therefore, since the ultrafine particles are fine particles of -10 μm or less, they tend to enter these pores during granulation. Therefore, it is considered that the ultrafine particles enter the pores of the powdered coke. It has been found that the more pores in the powdered coke, the more easily combustion proceeds, and the combustion is inhibited when these pores are clogged with ultrafine particles.

In addition, even if ultrafine raw materials are not used, normal sintering and blending raw materials may contain 10% or less of ultrafine particles, but by adding ultrafine particles containing a majority of ultrafine particles, the total amount of sinter and blending raw materials is reduced. It was found that by increasing the ratio of the ultrafine particles to the powder, the granulation property was further improved and combustion was further inhibited.

Then, in this invention, the technique of accelerating the combustion of powdered coke by reducing contact between an ultra-fine raw material and powdered coke as much as possible in the granulation process was developed. Specifically, the following process was developed to achieve the present invention.

(1) The sinter and blend raw material containing the ultrafine raw material is covered with powder coke by adding coke powder in the latter half of the granulation of the sinter and blend raw material whose granulation is accelerated by the ultrafine raw material.

(2) In the second half of the granulation, a raw material (limestone or semi-ore) containing no ultrafine raw material is added (enclosure), and powdered coke is then added to the exterior.

<About the manufacturing method of the sintered ore of the present invention>

First, the outline of the manufacturing method of the sintered ore of this invention is as follows. That is, the feature of the present invention is that when granulating raw materials for sintering and blending in which the particle size of 10 μm or less in the total amount after blending is increased by 1 to 10 mass% by blending ultrafine powder raw materials having a particle size of 10 μm or less in a majority, powder coke is removed during granulation. By adding it, there is a point of covering the powdered coke.

In the above, it is preferable to set the time from the addition of coke powder to the completion of the granulation of the raw materials for sintering and blending to be 30 to 120 seconds. Moreover, since it becomes possible to improve productivity in sintering if limestone or semi-ore is covered before adding coke powder, it is preferable. Here, the exterior time of powdered coke is the time from the addition of powdered coke to completion of granulation. When the raw materials for sintering and blending are continuously charged into the granulator and granulation is performed continuously, such as in a drum mixer, the residence time in the granulator may be obtained using tracer particles, and the movement state of the raw materials for sintering and blending in the granulator may be determined. You may observe and convert the distance from the exit of the granulator to time.

1 : is a flow chart for demonstrating an example of each process in the manufacturing method of the sintered ore of this invention. Referring to FIG. 1, each step of the method for producing sintered ore of the present invention will be described. First, powdered iron ore of a plurality of brands, ultra-fine raw materials, auxiliary raw material powder such as limestone, silica stone, and serpentine, and miscellaneous items such as scale and semi-ore. Prepare raw powder. At this time, the ultra-fine particles in the ultra-fine raw material are blended so as to be 1 to 10 mass% of the total amount after blending (step S1). At the same time, powdered coke as a solid fuel is also prepared (step S2). Next, the finely divided iron ore, the ultrafine raw material, the auxiliary raw material powder, and the miscellaneous raw material powder prepared in Step S1 are blended in appropriate amounts to obtain a sintered and blended raw material (Step S3). Here, it is more preferable to homogenize the raw materials blended in Step S3 by mixing and stirring them using a stirrer before the next Step S4. Next, a sinter and blend material formed by adding water to the obtained sinter and blend material as necessary is mixed and granulated (step S4).

In the present invention, while granulating raw materials for sintering and blending other than the coke powder in step S4 with a granulator, the coke powder prepared in step S2 is added. At this time, it is preferable to set the time from the addition of coke powder to the completion of the granulation of the raw materials for sintering and blending to be 30 to 120 seconds. After that, the granulated raw material for sintering is obtained (Step S5), and then, the obtained granulated raw material for sintering is loaded into a sintering machine and fired (Step S6) to obtain sintered ore (Step S7). As shown in FIG. 3, the obtained sintered ore particles are sintered ore particles coated with powdered coke.

2 : is a flowchart for demonstrating another example of each process in the manufacturing method of the sintered ore of this invention. Referring to FIG. 2, each step of the method for producing sintered ore of the present invention is described. First, powdered iron ore made of a plurality of brands, ultra-fine raw materials, auxiliary raw material powder such as limestone, silica stone, and serpentine, and miscellaneous items such as scale and semi-ore. Prepare raw powder. At this time, the ultra-fine particles in the ultra-fine raw material are blended so as to be 1 to 10 mass% of the total amount after blending (step S1). At this time, limestone or semi-ore used for the exterior is separately prepared (step S2). At the same time, powdered coke as solid fuel is also prepared (step S3). Next, the pulverized iron ore prepared in step S1, the ultra-fine raw material, the auxiliary raw material powder, and the miscellaneous raw material powder are blended in appropriate amounts to obtain a sintered blend raw material (step S4). Here, it is more preferable to homogenize the raw materials blended in Step S4 by mixing and stirring using a stirrer prior to the next Step S5. Next, a sinter and blend material formed by adding water to the obtained sinter and blend material as necessary is mixed and granulated (step S5).

In the present invention, in the middle of granulating the sintering and blending raw materials other than the limestone or semi-ore and powdered coke in step S5 with a granulator, add the limestone or semi-ore prepared in step S2, and then add the powdered coke prepared in step S3 (step S3). S5). At this time, it is preferable to set the time from the addition of coke powder to the completion of the granulation of the raw materials for sintering and blending to be 30 to 120 seconds. Further, the limestone or semi-ore is added after the start of granulation of the sinter blending raw materials other than powdered coke and limestone or semi-ore and before the addition of powdered coke. After that, the granulated raw material for sintering is obtained (step S6), and then, the obtained granulated raw material for sintering is loaded into a sintering machine and fired (step S7) to obtain sintered ore (step S8). As shown in Fig. 4, the particles of the obtained sintered ore are sintered ore particles coated with limestone or semi-ore and coated with powdered coke thereon.

Example

In fact, the following test 1 and test 2 were carried out, and the configuration essential to the manufacturing method of the sintered ore of the present invention and the preferred configuration were examined.

<Test 1> (Effect of powder coke cladding)

In this test 1, the exterior effect of powdered coke when the ultrafine powder raw material was added was evaluated. In this example, 99.9% or more of the ultrafine powder raw materials have a particle diameter of 10 µm or less, and 4% of the raw materials other than the ultrafine powder raw material have a particle diameter of 10 µm or less. In addition, the samples of comparative examples and examples shown in Table 1-1 and Table 1-2 below (basicity, SiO ₂ : 5% constant), sinter blended raw materials having the blending composition shown in Table 1-1 and Table 1-2 and water (moisture content of the granulated product is 7.5%) were put into a drum mixer, and granulation was performed for a total of 5 minutes to prepare a granulated raw material for sintering. After that, the granulated raw materials for sintering were fired using a pot tester.

In the example in which powdered coke is packaged, first, sintering and blending materials other than powdered coke were put into a drum mixer, and granulation was performed at a time after subtracting the exterior time for powdered coke. Next, powdered coke was added to the raw material after granulation, and it was mixed for each exterior time with a drum mixer to prepare a granulated raw material for sintering. After that, the granulated raw materials for sintering were fired using a pot tester. Further, in the examples of the present invention, dust sludge generated in steel mills having a particle size of -10 μm was used as an ultrafine powder raw material.

In terms of sintering productivity, when the sinter cake after sintering is dropped once from a height of 2 m, a particle diameter of +10 mm is taken as an ingredient, and its weight is (sinter cake weight - upper light (床敷鑛) ) weight) was used as the yield. The sintering production rate (t/h/m ² ) was determined by dividing the product weight by the firing time and the cross-sectional area of the test pot.

The results of Test 1 are shown in Table 1-1 and Table 1-2 below. 5 shows a graph showing the relationship between the production rate and the sheathing time from the data of Tables 1-1 and 1-2, and from the data of Tables 1-1 and 1-2 in FIG. 6, A graph showing the relationship between the comparative production rate and exterior time with 0 mass% of the ultra-fine powder raw material is shown.

[Table 1-1]

[Table 1-2]

As a result shown in Table 1-1 and Table 1-2, during the granulation of the sinter blend raw material containing 1 to 10 mass% of the ultrafine powder raw material, powdered coke was added at an exterior time of 30 to 120 seconds. When obtained, it was found that the productivity of the sintered ore is improved. Here, in the case of the exterior time of 15 seconds, the time for dispersing the powdered coke was not sufficient, resulting in non-uniform firing, and the sintering productivity rate was lowered, although higher than that in the case of the interior. In addition, a value obtained by subtracting the production rate of 0 mass% of the ultrafine powder raw material in the copper casing time from the production rate when 1 to 10 mass% of the ultrafine raw material was added was evaluated as a comparative production rate. As a result, it was found that the production rate was improved when the exterior time was 30 seconds or longer. The reason why the upper limit of the ultra-fine raw material is 10 mass% is that when the ultra-fine raw material is blended in an amount exceeding 10 mass%, local distribution of the ultra-fine raw material is observed, and defective products tend to increase.

This result is interpreted as follows. Air permeability in the sintering test can be evaluated using the air permeability index: JPU shown in Fig. 7, and the higher the index, the higher the air permeability. From the results of this test, it was found that air permeability is improved by adding the ultrafine powder raw material. Also, if you pay attention to the sintering time, when the powder coke is put in at the start of granulation (internal), even if the ventilation is improved, the firing time will not be shortened. , the sintering time becomes shorter. This is because combustion of the powdered coke is inhibited by the addition of the ultra-fine raw material, but the combustibility is improved by covering the powdered coke.

<Test 2> (for exterior effect of limestone or semi-gloss)

In this test 2, the exterior effect of limestone or semi-ore when powdered coke was exteriorized by adding ultrafine powder raw material was evaluated. In this example, 99.9% or more of the ultrafine powder raw materials have a particle diameter of 10 µm or less, and 4% of the raw materials other than the ultrafine powder raw material have a particle diameter of 10 µm or less. Further, the samples (basicity, SiO ₂ : 5% constant) of Examples shown in Table 2 below were put into a drum mixer with sintered blending raw materials having the blending composition shown in Table 2 and water (moisture content of the granulated material being 7.5%). , Granulation was performed for a total of 5 minutes to prepare granulated raw materials for sintering. After that, the granulated raw materials for sintering were fired using a pot tester. In addition, Example 23 is the same as the data shown in Table 1-2.

When powdered coke and limestone or semi-ore are coated, sintered blending materials other than powdered coke and limestone or semi-ore are put into a drum mixer, first, the time after subtracting the exterior time of the limestone or semi-ore is granulated, and then, the powder coke Exterior time granulation was performed to prepare a sintered granulated raw material. Specifically, in Example 41, sinter blending materials other than limestone and coke powder were granulated for 4.25 minutes, and then limestone was added. Next, granulate 0.25 minutes and add powdered coke. After that, granulation was performed for 1 minute. In Example 42, a test was conducted in which the limestone of Example 41 was replaced with semi-ore. Mixed with a drum mixer. In terms of sintering productivity, when the sinter cake after sintering is dropped once from a height of 2 m, the yield is a value obtained by dividing the weight by (weight of sinter cake - weight of top beam) with a particle diameter of +10 mm as an attribute. was made The sintering production rate (t/h/m ² ) was determined by dividing the product weight by the firing time and the cross-sectional area of the test pot. A result is shown in Table 2 below.

[Table 2]

As a result, it was found that contact between the ultrafine raw material and powdered coke can be suppressed and productivity in sintering is improved by further encasing limestone or semi-ore inside the exterior of powdered coke.

Next, as a preferred example of the present invention, pores and granulation methods of powdered coke were examined.

Conventionally, when ultra-fine powder of -10 µm is used, a technique of adding coke powder in the latter half of the drum mixer has been proposed as follows.

In WO2018/194014, addition of ultra-fine powder is considered as a countermeasure against the deterioration of granulation properties when fine-grain powder coke is used. At that time, pretreatment by a high-speed stirrer is used to disperse the ultrafine powder. However, in the present invention, the effect of improving the granulation property due to the exterior of powder coke was aimed at, and development was not aimed at improving the combustibility of powder coke when fine powder was added.

In WO2011/004907, ultrafine powder having an average particle diameter of 10 μm is added, mixed with a drum mixer, granulated with a pelletizer, and finally coated with powder coke. As an invention of adjusting the exterior time according to the strength of the granulated particles has been In the present invention, it is proposed that when the exterior time is long, the granulated particles collapse, and the coke powder and the raw material for sintering are mixed in the surface layer of the granulated particles, thereby deteriorating the combustibility or deteriorating the granulation property.

In the effects of the present invention, unlike these inventions, the effect of suppressing the entry of ultrafine powder into the pores of the powder coke shell and impairing the combustibility of the powder coke exterior is considered.

Here, as the pore size that greatly contributes to combustion, the balance between the ease of entry of gas and the specific surface area of pores becomes important. This relationship is thought to be independent of substance. Japanese Unexamined Patent Publication No. 10-265857 discloses that the relationship between sintered ore and reducing gas is set to 10 to 100 μm, and it is considered that the pore size is effective also in combustion of coke powder. When the amount of powder coke with a pore diameter of 10 to 100 μm is more than a certain level, it becomes important to utilize combustion through the pores. In the present invention, the effect is expressed at a particle size of 0.40 cc/g with a pore size of 10 to 100 μm, and it is estimated that the effect of the powder coke exterior effect increases at a pore amount or more.

Further, in the present technique, the effect is easier to obtain than in the case of granulation using only a drum mixer. Unlike a pelletizer, a drum mixer is subjected to a drop impact within the granulator, so the destructive effect of the granulated particles is large, making it difficult to granulate. Therefore, it is considered that the ultrafine particles adhering to the granulated particles are more likely to be separated than in the case of strong granulation such as a pelletizer. Therefore, in granulation using only a drum mixer, it is considered that it is easy to obtain an effect in which the time in which the coke and the ultrafine powder are not brought into contact is short.

A comparison of the capabilities of a disk pelletizer and a drum mixer has been conducted by Suzuki in the past (Suzuki et al. Iron and Steel 15 (1987) 1932). Suzuki compares the ability of each granulator at the rolling distance that affects granulation, and makes it clear that the pelletizer's granulating ability (ability to increase the particle size) is high even at the same rolling distance.

In the present invention, the granulation ability is the ability of the combination of the effect of increasing the granulated particles by the rolling distance and the ability to destroy the quasi-particles in the granulator, and the reason why the capacity of the drum mixer is lower than that of the pelletizer is the phenomenon of destruction. I came to think that it reflects the .

In addition, from the particle size distribution of the raw material, it is considered that fine powders that are difficult to fill geometrically are more difficult to be introduced into granulated particles, contributing to filling the pores of coke. The Andreasen (Gaudin-Schuhmann) distribution is known as the exponent of the particle size distribution (Suzuki et al., Journal of Chemical Engineering, 11(1985)4, 438).

D: integrated weight ratio, Dp: representative diameter, Dp _max : maximum value of representative diameter, q: Fuller index

It is known that the closer the exponent q is to 0.7, the more easily the voids are geometrically filled. In the case of mixing of the raw materials used in Comparative Example 1 shown in Table 1-1, it was found that q = 0.2. By adding fine grains, q is lowered. Therefore, by adding ultra-fine powder, ultra-fine powder that is difficult to fill is added. Ultra-fine powder that does not enter between the particles aggregates only with the ultra-fine powder or enters the pores of other particles. Therefore, it is thought that the ultrafine powder that fills the pores of powdered coke tends to exist. Therefore, as in the present invention, when the ultrafine powder is increased compared to the normal blending, the effect of the powder coke coating is also increased.

According to the method for producing sintered ore according to the present invention, even when the granulation property is improved by adding ultrafine powder to the sintering and blending raw material at the time of granulation of the sintered and blended raw material, the decrease in productivity of the sintered ore after sintering can be prevented. In addition to those exemplified, this manufacturing method can be applied to various sintering and blending raw materials.

Claims (5)

In the manufacturing method of sintered ore, which obtains sintered ore by granulating sintering and blending raw materials containing iron ore consisting of a plurality of brands with a granulator, and firing the obtained granulated raw material for sintering with a sintering machine,
The sintering and blending raw materials are blended with ultrafine powder raw materials having a majority of particle diameters of 10 μm or less, increasing the particle size of 10 μm or less in the total amount after blending by 1 to 10 mass%, and when granulating the sinter and blending raw materials, sinter other than powder coke Powdered coke is added during granulation of the blended raw materials with a granulator,
As the powder coke, a method for producing a sintered ore characterized in that using a powder coke having a pore size of 10 to 120 μm of 0.40 cc / g or more. According to claim 1,
A method for producing sintered ore, characterized in that the time from the addition of the coke powder to the end of granulation is 30 to 120 seconds. According to claim 1 or 2,
Production of sintered ore, characterized in that in the granulation of the sinter blending raw materials, the limestone or semi-ore is added after the start of the granulation of the sintering and blending raw materials other than powdered coke and limestone or semi-ore and before the addition of the powdered coke. method. According to claim 1 or 2,
The method of producing a sintered ore, characterized in that the granulation is carried out using only a drum mixer. According to claim 3,
The method of producing a sintered ore, characterized in that the granulation is carried out using only a drum mixer.

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