JP6295783B2 - Method for producing sintered ore - Google Patents

Description

  The present invention relates to a method for producing sintered ore for producing steel, and more particularly to a method for suppressing the generation of nitrogen oxides by pretreatment of a coagulation material.

A sintered ore used for steel production is manufactured by firing a pseudo-granulated material obtained by mixing a granulated material such as a coagulant and lime with iron ore as a raw material and firing it with a sintering machine. At this time, a part of nitrogen contained in the coagulation material becomes nitrogen oxide (hereinafter referred to as “NOx”) and is mixed in the exhaust gas.
Since NOx is an air pollutant, there are restrictions on the concentration and amount of NOx emission to the atmosphere, and restrictions such as adjustment of operating conditions occur. Installation of an exhaust gas treatment device for removing NOx is also performed, but a great investment in equipment is required. Therefore, for the purpose of reducing operational restrictions and capital investment, methods for suppressing the generation of NOx by pretreatment of the aggregate have been studied.

  The aggregating material is a material mainly containing carbon, including a material that becomes a NOx source, and generates heat by oxidation. For example, it refers to coal and coke.

One method of suppressing the generation of NOx by pretreatment of the aggregate is to coat the surface of the aggregate with a substance that reduces the generated NOx. For example, Patent Document 1 discloses a technique in which a fine powder catalyst containing calcium ferrite and a coagulant coexist, and the generated NOx is reduced and suppressed.
In the invention described in Patent Document 1, in order to reduce the cost while suppressing the generation of NOx, the blending ratio of calcium ferrite and the like is specified, and the NOx conversion indicating the ratio of the nitrogen content in the coagulated material converted to NOx The rate is over 30%. The NOx conversion rate is the ratio of nitrogen content converted to NOx with respect to the total amount of nitrogen content contained in the coagulation material.

  However, in actual operation, it is desired to further reduce the NOx conversion rate. In Patent Document 2, by specifying calcium ferrite or the like of Patent Document 1 as quick lime, the NOx conversion rate can be reduced to the 20% level. It is shown.

JP-A-8-60257 JP 2012-172067 A

  In paragraph [0005] of Patent Document 2, it is described that a fine powder condensate under 0.25 mm is oxidized at a low temperature and NOx is likely to be generated. Further, in paragraph [0038] of Patent Document 2, even if it is a granulated product (granulated body (P type)) of a fine powdered agglomerated material and fine powdered quicklime, NOx is attributed to the fact that the agglomerated material is a fine powder. It is described to increase. For this reason, in the invention described in Patent Document 2, the generation of NOx is suppressed by mainly using a condensing material over 0.25 mm.

  Since the aggregate is generally produced by pulverizing coal or coke, for example, a pulverized aggregate of 0.25 mm or less is constantly produced. Therefore, there is a problem that if a condensing material over 0.25 mm is mainly used, the fine powder condensing material becomes excessive. There is also a need to further reduce the NOx conversion rate.

  The present invention has been made in view of such circumstances, and it is possible to suppress the generation of NOx as compared with the conventional case, and it is possible to obtain the same effect even if a fine powder condensate of 0.25 mm is present. It aims at providing the manufacturing method of a sintered ore.

  In order to achieve the above-mentioned object, the present invention was prepared by charging a coagulation material used in the production of sintered ore for steel production together with quick lime and / or slaked lime into a kneading apparatus and granulating it in the presence of moisture. The granulated product is supplied to a compression molding apparatus and compressed and then added to a drum mixer for granulating a sintered raw material containing iron ore.

  In the present invention, the agglomerated material is charged into a kneading apparatus together with quick lime and / or slaked lime and granulated in the presence of moisture and supplied to the compression molding apparatus. Thereby, the granulated material which consists of a condensing material, quicklime, etc. is compression-molded with a roll, and a dense granulated material is formed. As a result, the air permeability between the particles constituting the granulated product is suppressed, the oxidation of the coagulant does not proceed at the low temperature stage, and the generation of NOx is suppressed.

  The granulated product in the present invention is an S-type granulated product in which a coating layer such as quicklime is formed around the aggregated particles, and a P-type granulated product in which a fine powdered aggregate and quicklime are mixed, unless otherwise specified. It refers to both grains.

  Moreover, in the manufacturing method of the sintered ore which concerns on this invention, the said condensing material may contain 20 mass% or more of fine powder with a particle size under 0.25 mm.

  Since a dense granulated product is formed according to the present invention, generation of NOx can be suppressed as compared with the conventional case even if the coagulant contains fine powder having a particle size of 0.25 mm or less. At that time, as will be described later, the NOx reduction effect becomes more conspicuous when 20% by mass or more of the fine powder condensate of 0.25 mm is included.

Moreover, in the manufacturing method of the sintered ore concerning this invention, it is suitable to perform granulation by the said kneading apparatus for 60 seconds or more.
In the said structure, by performing granulation with a kneading apparatus for 60 seconds or more, the density of a granulated material and a coating layer improves, and a NOx reduction effect expands.

Moreover, in the manufacturing method of the sintered ore which concerns on this invention, it is suitable to adjust a water | moisture content so that the water | moisture content at the time of granulation by the said kneading apparatus may be 10 mass% or more.
In the said structure, by performing the said water | moisture content adjustment, a precise granule and a coating layer are formed and a NOx reduction effect is expanded.

Moreover, in the manufacturing method of the sintered ore which concerns on this invention, you may further granulate the said granulated material compression-molded using a granulator.
In the said structure, by further granulating the granulated material which carried out the compression molding using the granulator, the density of a granulated material and a coating layer further improves, and a NOx reduction effect expands.

Further, in the method for producing a sintered ore according to the present invention, it is preferable that the compressed granulated product or the granulated product further granulated by the granulating device is added to the subsequent stage of the drum mixer. To do.
In this configuration, the compressed granulated product or the granulated product further granulated by the granulator is added to the subsequent stage of the drum mixer, whereby the coating layer is peeled off or the granulated product in the drum mixer. Is suppressed, and a high NOx reduction effect can be maintained.

  According to the method for producing a sintered ore according to the present invention, a compacted product is formed by compressing and molding a granulated product charged in a kneading apparatus together with quick lime and / or slaked lime, and granulated in the presence of moisture. Since particles are formed, the generation of NOx can be suppressed as compared with the conventional case, and the same effect can be obtained even when a fine powder condensate of 0.25 mm is present.

It is the graph which showed the improvement ratio of the NOx conversion rate for every granulation method of a coagulation material. It is a schematic diagram of the sintering plant to which the manufacturing method of the sintered ore which concerns on one embodiment of this invention is applied. It is sectional drawing of a briquette manufacturing machine. It is a graph which shows the relationship between the ratio of 0.25mm under in a condensate, and the improvement ratio of NOx conversion rate. It is a graph which shows the relationship between the granulation time by a kneading apparatus, and the improvement rate of NOx conversion rate. It is a graph which shows the relationship between the moisture ratio of a granulated material, and the improvement ratio of NOx conversion rate. It is the graph which showed the improvement ratio of the NOx conversion rate in the case where granulation is performed after compression molding by the compression molding apparatus and when it is not performed, and when the granulated product is added to the drum mixer and when it is added later.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. In the following description, a granulated product obtained by granulating a coagulation material together with quick lime or the like is “granulated product”, and a granulated product obtained by adding the granulated product to iron ore or anthracite or the like “pseudo granulated product” Call it.

[Mechanism to suppress NOx generation]
The inventors of the present invention investigated the relationship between the granulated material described in Patent Document 2 containing a fine powder condensing material of 0.25 mm and NOx generation. Specifically, in order to investigate the effect of the agglomerated material granulation method, particularly the acceleration and compression force (pressure density) acting on the granulated product, the drum mixer and pan pelletizer with relatively low acceleration and / or compression force are used. A compression molding device with a large compressive force and a malmerizer with a large acceleration were compared.

In the comparative experiment, 10% by mass of quicklime is added to the coke, which is a coagulant, and the amount of water added is adjusted so that the final moisture becomes 15% by mass. Went. Next, the granulated product granulated by each apparatus was added to the subsequent stage of the drum mixer for granulating the sintered raw material containing iron ore to granulate the pseudo granulated product. And the NOx generation amount was computed by measuring the flow rate of the exhaust gas generated when the pseudo granulated product was fired and the NOx concentration contained in the exhaust gas.
Table 1 shows the composition of the sintering material used in the comparative experiment (composition on the drum mixer outlet side for granulating the sintering material containing iron ore). Coke containing 25% by mass of 0.25 mm under fine powder was used.

In the granulation of the coagulant, a test machine having a diameter of 1 m was used for the drum mixer, and granulation was performed for 5 minutes at a rotation speed of 20 rpm.
A pan with a diameter of 1 m and an inclination angle of 45 ° was used as a pan pelletizer, and granulation was performed at a rotation speed of 15 rpm for 5 minutes.
For the compression molding apparatus, a 200φ twin roll briquette making machine was used, and after the agglomerated material and quicklime were granulated by the kneading apparatus, the briquette making machine was compression molded at a linear pressure of 0.3 ton / cm. . As the kneading apparatus, a high-speed stirring mixer (Eirich mixer) having a capacity of 40 L was used, and granulation was performed for 300 seconds at a bread rotation speed of 13 rpm and an agitator rotation speed of 300 rpm.
The granulation treatment by the Malmerizer was performed for 2 minutes with the number of rotations of the disk at the bottom of the vertical cylindrical container having a diameter of 1 m being 200 rpm.

FIG. 1 shows the improvement rate of the NOx conversion rate when the coagulated material granulated by each apparatus is used with respect to the NOx conversion rate when the coagulated material not subjected to granulation treatment is used.
The NOx conversion rate was determined by calculating the amount of nitrogen converted from NOx generation amount to NOx and converting it to a ratio when the amount of nitrogen in the coagulated material analyzed in advance was 100. Moreover, the improvement rate of the NOx conversion rate was calculated by the following equation.
Improvement rate of NOx conversion rate = (1−NOx conversion rate when using a granulated coagulated material / NOx conversion rate when using a coagulated material that is not granulated) × 100%

From the figure, it can be seen that the granulated product granulated with a drum mixer or pan pelletizer has a low improvement rate of NOx conversion rate of less than 10%, and contributes little to the suppression of NOx generation. In addition, it can be seen that a Malmerizer with a large acceleration has a small NOx suppression effect when the improvement rate of the NOx conversion rate is about 10%.
The granulated product granulated with a drum mixer or pan pelletizer has a substantially less than 1G acceleration on the granulated product at the time of granulation, while the Malmerizer reaches 20G, but the NOx suppression effect is equivalent. From the low level, it has been found that the generation of NOx cannot be sufficiently suppressed by necessarily increasing the acceleration.

  On the other hand, the present inventors have compression molded a granulated product granulated with a high-speed agitating mixer, for example, with a briquette manufacturing machine with a linear pressure of 0.3 ton / cm (hereinafter referred to as a granulated product after compression molding). The amount of NOx generated at the time of firing was investigated using the “molded product”. As a result, compared with the granulated product granulated with a drum mixer, pan pelletizer, and mulmerizer, the improvement rate of NOx conversion increased to 30% in the firing using the molded product compressed by briquette making machine. It has been found that the amount of NOx generated is greatly reduced.

  The difference in the amount of NOx generated as described above is that, in the granulated product having a low pressure density, air permeates between the constituent particles, so that the fine powder condensate in the granulated product is oxidized from a relatively low temperature stage. The molded product compression-molded by the briquette manufacturing machine is considered to be because the constituent particles are consolidated and the air permeability between the particles is suppressed, and oxidation of the fine powder condensate does not proceed at a low temperature stage. Furthermore, when the temperature reaches 1000 ° C. or higher in the sintering machine, quick lime and slaked lime constituting the granulated material melt and flow out, and the exposed fine aggregate is oxidized at a high temperature of 1000 ° C. or higher, thereby generating NOx. It is thought that it was suppressed.

In addition, when the granulated product granulated with a drum mixer is air-cured for several days and dried and dropped onto a concrete floor from a height of 1 m, the generation ratio of powder of 0.5 mm or less is 10% or less. . On the other hand, when the molded product compression-molded by the briquetting machine is dropped onto a concrete floor from a height of 1 m, the generation ratio of 0.5 mm or less powder is 25%. Therefore, the granulated product granulated by the drum mixer becomes a high-strength granulated product by curing in the air.
However, comparing the improvement rate of the NOx conversion rate between the granulated product cured with air and the molded product compressed with briquette machine, the NOx suppression effect of the granulated product cured with air is the molded product compressed with briquette machine. Was not enough.

  From the above results, it has been found that it is effective in suppressing NOx to apply a strong compressive force to the granulated product to form a dense granulated product. In particular, even though the strength of the granulated product was ensured by curing, sufficient NOx suppression was not achieved, but when a forced compressive force by the roll was applied to the granulated product, the NOx suppressing effect was remarkable. Therefore, it is presumed that the granulated material was densified by compression and the NOx conversion rate was suppressed.

[Configuration of the present invention]
On the basis of the above knowledge, the present invention is a granulated product in which the agglomerated material used for the production of sintered ore for steel production is charged into a kneading apparatus together with quick lime and / or slaked lime, granulated in the presence of moisture, and granulated. After the product is supplied to a compression molding apparatus and compression molded, the sintered raw material containing iron ore is added to a drum mixer for granulating.

By granulating the condensate and quicklime, etc., and covering the condensate with quicklime, etc., oxidation of the condensate hardly proceeds to about 1000 ° C. in the sintering machine pallet. When it exceeds 1000 ° C., quick lime and the iron ore around the granulated material form a low melting point compound, and quick lime and the like melt out from the granulated material. In response to this, the aggregate is exposed to a high temperature atmosphere, and the oxidation of the aggregate progresses remarkably. Thus, since it becomes possible to oxidize a coagulation material in a high temperature atmosphere of 1000 degreeC or more, for example, it is good to granulate a coagulation material, quicklime, etc.
In addition, quick lime is digested to become fine calcium hydroxide fine particles, and dispersion is promoted, and slaked lime is partly dissolved and re-precipitated between the aggregated particles as calcium hydroxide fine particles. As a result, a strong and dense granulated product is obtained.

Further, by supplying the granulated product to the compression molding apparatus, the granulated product is compression molded by a roll to become a dense granulated product, and a remarkable NOx reduction effect is obtained.
The compression molding apparatus may be an apparatus having a roll that applies a compressive force to the raw material, such as a briquette manufacturing machine, a roller compactor, and a roller mill.
Note that a compression molding apparatus such as a briquette manufacturing machine has a low function of kneading a coagulant and quicklime, and therefore it is necessary to knead (granulate) the coagulant and quicklime using a kneader in advance.

  The compression-molded product (granulated product) is flaked. The flake thickness is preferably 1.5 times or more the average particle size of the coagulated material in order to reliably cover the coagulated material with quick lime or the like. In addition, the flake thickness is less than 4 times the average particle size of the coagulated material in order to make it easier to oxidize the coagulated material in the molded product at a high temperature and more uniformly disperse the molded product in the sintered raw material containing iron ore. It is preferable that Therefore, it is desirable to adjust the linear pressure of the compression molding apparatus so that the flake thickness falls within the above range.

[Method for producing sintered ore]
A method for manufacturing a sintered ore according to an embodiment of the present invention will be described with reference to a sintering plant shown in FIG.
A predetermined amount of agglomerate and quicklime are cut out from the storage tank 13 in which the condensed material is stored and the storage tank 14 in which quicklime and slaked lime are stored, respectively, and charged in the kneading apparatus 10 and granulated in the presence of moisture. To do.
The amount of quicklime and the like is preferably 5% by mass or more and 60% by mass or less with respect to the total amount combined with the coagulant, that is, the inner amount. When it exceeds 60 mass%, the influence which suppresses a coagulation | solidification material combustibility will become remarkable. In addition, the moisture is adjusted so that the moisture at the time of granulation by the kneading apparatus 10 is 10% by mass or more on the inside, and the granulation time by the kneading apparatus 10 is 60 seconds or more.

The granulated product granulated by the kneading apparatus 10 is supplied to the compression molding apparatus 11 and compression molded so that the flake thickness is about 1.5 to 4 times the average particle diameter of the aggregate.
FIG. 3 shows a briquette manufacturing machine which is an example of the compression molding apparatus 11. The compression molding apparatus 11 is installed in a hopper 21 into which a granulated product is charged, a pair of rolls 22 for compressing and molding the granulated product, and supplies the granulated product between the pair of rolls 22. The screw feeder 23 is generally configured.

  When the granulated material is put into the hopper 21, the granulated material in the hopper 21 is sent between the pair of rolls 22 by the screw feeder 23. The pair of rolls 22 arranged side by side with a slight clearance are rotating in opposite directions, and the granulated material inserted between the pair of rolls 22 is compressed by passing through the pair of rolls 22. It becomes a flaky shaped product.

A molded product (granulated product) compression-molded by the compression molding device 11 is charged into a pan pelletizer 12 (an example of a granulating device), granulated, and then stored in a storage tank 17 or a temporary storage tank 18. Is done. When the granulated product is pre-added to the drum mixer 19 for granulating the sintered raw material containing iron ore, it is stored in the storage tank 17, and when the granulated product is added later to the drum mixer 19, it is stored in the temporary storage tank 18. .
A part of the granulated material may be stored in the storage tank 17 and the rest in the temporary storage tank 18. Moreover, you may store in the storage tank 17 or the temporary storage tank 18, without performing the additional granulation by the pan pelletizer 12. FIG.

  On the other hand, the drum mixer 19 is charged with iron ore or anthracite cut out from the storage tank 15 in which iron ore is stored, the storage tank 16 in which anthracite is stored, or the like. In addition, the granulated product cut out from the storage tank 17 is added to the drum mixer 19 in advance, or the granulated product cut out from the temporary storage tank 18 is added to the drum mixer 19 in the subsequent stage. In the drum mixer 19, the granulated product that has been added to the drum mixer 19 before or after the subsequent stage is granulated together with iron ore, anthracite, or the like to produce a pseudo-granulated product.

  The pseudo-granulated product produced by the drum mixer 19 is charged into the sintering machine 20 and fired to become a sintered ore. Exhaust gas generated during sintering is sucked from the sintering machine 20 by a blower (not shown), and dust and the like are removed by an electric dust collector (not shown), and then discharged from the chimney (not shown) to the atmosphere.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the configuration described in the above-described embodiment, and is within the scope of matters described in the claims. Other possible embodiments and modifications are also included. For example, in the above embodiment, after performing compression molding with a compression molding apparatus, granulation processing was performed using a pan pelletizer, but instead of a pan pelletizer, other granulation apparatuses such as a drum mixer and a Redige mixer were used. May be.

  According to the present invention, since the oxidation of the aggregate can be started at a higher temperature than in the conventional technique, the NOx suppression effect is remarkable. Therefore, NOx can be suitably reduced even in a particle size distribution that is conventionally said to have a large amount of NOx generation, and a high NOx suppression effect can be obtained even when a fine powder condensate of 0.25 mm or less is used.

  FIG. 4 is a graph showing the improvement rate of the NOx conversion rate when the fine powder contained in the coagulation material is changed. For the granulation of the agglomerated material, 10% by mass of quick lime and 15% by mass of water were added using a high-speed stirring mixer, and the pan rotation speed was 13 rpm and the agitator rotation speed was 300 rpm, which was performed for 300 seconds. Thereafter, the granulated product was compression molded at a linear pressure of 0.3 ton / cm using a briquette manufacturing machine having a roll diameter of 200 mm.

From the figure, it can be seen that the improvement rate of the NOx conversion rate is limited to about 10% at a stage where the amount of fine powder condensate is as low as 15% by mass, whereas the improvement rate of the NOx conversion rate is increased at 20% by mass or more. It is considered that the improvement effect is expanded because a dense granulated material is also formed on the fine powder agglomerated material.
For this reason, in the present invention, the proportion of fine powder of 0.25 mm under contained in the coagulant is defined as 20% by mass or more. On the other hand, the upper limit of the fine powder ratio under 0.25 mm contained in the coagulant is not specified, but when the fine powder ratio under 0.25 mm increases, the crushing time of the coagulant increases, and usually 50% by mass or less. And

FIG. 5 is a graph showing the relationship between the granulation time by the kneading apparatus and the improvement rate of the NOx conversion rate. The granulation treatment of the coagulant is performed using a high-speed agitating mixer, and 10% by mass of quicklime is added to the coagulant containing 20% by mass of fine powder of 0.25 mm or less to adjust the water content to 15% by mass. Granulation was carried out at 13 rpm and an agitator rotation speed of 300 rpm. The granulated product granulated by the high-speed stirring mixer was compression-molded at a linear pressure of 0.3 ton / cm using a briquette manufacturing machine having a roll diameter of 200 mm.
From the figure, it can be seen that when the granulation time is less than 60 seconds, the improvement rate of the NOx conversion rate is small, but when the granulation time is less than 60 seconds, the improvement greatly occurs. It is considered that the density is improved and the NOx reduction effect is expanded.
Therefore, in the present invention, the granulation time of the coagulating material by the kneading apparatus is defined as 60 seconds or more. On the other hand, if the granulation time of the coagulation material by the kneading device exceeds 600 seconds, the granulated material is crushed. Therefore, the upper limit of the granulation time of the coagulation material by the kneading device is 600 seconds.

FIG. 6 is a graph showing the relationship between the moisture content of the granulated product and the improvement rate of the NOx conversion rate. For the granulation of the agglomerated material, a high-speed stirring mixer is used, 10% by mass of quicklime is added to the agglomerated material containing 20% by mass of fine powder of 0.25 mm or less, the rotation speed of the pan is 13 rpm, and the rotation speed of the agitator is 300 rpm. Granulated for 300 seconds. The granulated product granulated by the high-speed stirring mixer was compression-molded at a linear pressure of 0.3 ton / cm using a briquette manufacturing machine having a roll diameter of 200 mm.
From the figure, it was found that when the moisture content is less than 10% by mass, the improvement rate of the NOx conversion rate is small, but when the moisture content is 10% by mass or more, the improvement rate is greatly improved. It is thought that dense granulations and coating layers are formed by increasing the moisture content, and the NOx suppression effect is expanded.
For this reason, in the present invention, the water content at the time of granulation of the coagulated material by the kneader is defined as 10% by mass or more. Further, since the same tendency is shown until the moisture content at the time of granulation of the coagulation material is 20% by mass, the upper limit of the moisture content at the time of granulation of the coagulation material is set to 20% by mass.

FIG. 7 shows the improvement rate of the NOx conversion rate when the granulation treatment is performed after compression molding by the compression molding apparatus and when the granulation product is added to the drum mixer and when the granulation product is added later. It is a graph. In the figure, DM is a drum mixer and PP is a pan pelletizer.
For the granulation of the coagulated material, a high-speed stirring mixer is used, 10% of quicklime is added to the coagulated material containing 25% by mass of fine powder of 0.25 mm or less to adjust the moisture to 15% by mass, and the rotation speed of the pan is 13 rpm. The agitator was granulated for 300 seconds at a rotational speed of 300 rpm. The granulated product granulated by the high-speed stirring mixer was compression-molded at a linear pressure of 0.3 ton / cm using a briquette manufacturing machine having a roll diameter of 200 mm (without PP). Further, this molded product was granulated with a pan pelletizer having a diameter of 1 m for 5 minutes at a pan inclination angle of 45 ° and a rotation speed of 15 rpm (with PP).

From the figure, it can be seen that the improvement rate of the NOx conversion rate increases by adding the pan pelletizer granulation under any condition. This is probably because the coating thickness increases due to the additional granulation.
In addition, it can be seen from the figure that the improvement rate of the NOx conversion rate is remarkably increased by adding the granulated material after the drum mixer for granulating the sintered raw material containing iron ore. It is considered that peeling of the coating layer of quick lime and / or slaked lime in the drum mixer and collapse of the granulated product are suppressed, and a dense coating layer and granulated product are secured.

10: kneading apparatus, 11: compression molding apparatus, 12: pan pelletizer, 13-17: storage tank, 18: temporary storage tank, 19: drum mixer, 20: sintering machine, 21: hopper, 22: roll, 23: Screw feeder

Claims (7)

  The coagulation material used for the production of sintered ore for steel production is charged into a kneading device together with quicklime and / or slaked lime, granulated in the presence of moisture, and the granulated product is supplied to a compression molding device. A method for producing sintered ore, comprising adding a sintered raw material containing iron ore to a drum mixer for granulating after compression molding.   2. The method for producing a sintered ore according to claim 1, wherein the coagulant contains 20% by mass or more of fine powder having a particle size of 0.25 mm or less.   3. The method for producing a sintered ore according to claim 1, wherein granulation by the kneading apparatus is performed for 60 seconds or more.   The method for producing a sintered ore according to any one of claims 1 to 3, wherein moisture adjustment is performed so that moisture at the time of granulation by the kneading apparatus is 10% by mass or more. Manufacturing method of ore.   In the manufacturing method of the sintered ore of any one of Claims 1-4, the granulation process is further granulated using the granulation apparatus of the said granulated material by compression molding, The sintered ore characterized by the above-mentioned. Production method.   5. The method for producing a sintered ore according to claim 1, wherein the granulated product that has been compression-molded is added to a subsequent stage of the drum mixer.   6. The method for producing a sintered ore according to claim 5, wherein the granulated product granulated by the granulator is added to the subsequent stage of the drum mixer.

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