JP3233141B2 - Granular material containing synthetic resin material, method for producing the same, and method for blowing granular material into furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of synthetic resins such as plastics, especially paper-containing plastic films, as fuel for blowing in furnaces such as blast furnaces and scrap melting furnaces, and the surface containing the synthetic resin material is melted and solidified. The present invention relates to a granulated material, a method for producing the same, and a method for blowing the granular material into a furnace.

[0002]

2. Description of the Related Art In recent years, synthetic resins such as plastics as industrial wastes and general wastes have been rapidly increasing, and their disposal has become a major social problem. Among these, plastics, which are high-molecular hydrocarbon compounds, generate a large amount of heat during combustion, and when incinerated, damage to the incinerator makes mass treatment difficult, and many of them are dumped in landfills. That is the current situation. However, dumping of plastics and the like is not preferable in terms of environmental measures, and development of a large-scale treatment method is eagerly desired.

Against this background, there has been proposed a method of using synthetic resins such as plastics as auxiliary fuel for blast furnaces and the like. In these methods, a synthetic resin pulverized material is blown into a blast furnace from a tuyere or the like as a fuel. For example, in the former, as a substantial condition of the synthetic resin pulverized material blown into the furnace, the particle size is 1 to 10 mm. , Bulk density of 0.35 or more.

However, when synthetic resins such as plastics are used as blowing fuel for blast furnaces and the like, it has been found that there are the following problems to be solved. When plastics discarded as industrial waste or general waste are classified according to their forms, they are roughly classified into bulk plastics such as plate materials and film-like plastics. Occupy the amount. However, it has been found that the pulverized product of the film-shaped plastic has extremely poor transportability and fluidity, and has a serious problem in handling when used as a fuel.

[0005] Therefore, it is practically impossible to use film-like plastic as a blowing fuel for a blast furnace or the like unless this problem is solved. It is clear that the advantages of mass processing and effective use of waste plastics will be lost unless film plastics can be used.

In order to inject plastic as fuel into a blast furnace, it is necessary to use plastic that has been pulverized in order to ensure flammability and the like. However, from the viewpoint of processing cost, there is a limit to the particle size that can be pulverized. For this reason, as shown in the prior art, a grain size of about 1 to 10 mm is the limit of grain refinement. However, crushed lump plastics having such a particle size may not have sufficient flammability in a blast furnace, and unburned plastics may be fused in bed coke and ventilated in the furnace. The blast furnace operation may be severely impaired and the operation of the blast furnace may be hindered.

[0007] Furthermore, since the crushed lump of the bulk plastic has an irregular and square shape, it is 1-10.
With a particle size of about mm, the dischargeability when cutting out from the storage silo, the fluidity when transporting to the blast furnace, and the transportability are poor, and it is easy for clogging to occur in the silo cutout part and the middle of the pneumatic piping system It turned out that there was also a problem. Therefore, just as suggested in the prior art, plastics are simply 1-10 mm.
It is extremely difficult to use plastic as waste as a fuel for blowing into a blast furnace or the like on an industrial scale only by pulverizing to a particle size of about a degree and processing it into a granular material having a high bulk density and then blowing it into a blast furnace.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, Japanese Patent Laid-Open Publication No. 09-137926
"Prior art 1") discloses a method of injecting fuel into a furnace. According to the method disclosed in Japanese Patent Application Laid-Open No. 09-137926, it is pointed out that the presence of the film-like synthetic resin material in the waste synthetic resin makes the use of the synthetic resin as a furnace fuel practically impossible. After that, the synthetic resins to be supplied to the fuel are separated into synthetic resins mainly composed of film-like synthetic resins and other synthetic resins and received in the processing equipment, and these are subjected to different processes. To process into a granular material suitable for a solid fuel for pneumatic transport, and pneumatically transport the granular synthetic resin after the processing to a furnace.

However, according to Prior Art 1, if unmelted components such as paper and cardboard are mixed (especially, 10% or more) into the film-like synthetic resin material, when the blast furnace is blown,
Fluffy foreign substances that cause clogging in tanks and pipes are generated by volume reduction and solidification. Similarly, in the case of a mixture of films having different melting points, fluff-like foreign matter is generated by volume reduction and solidification. as a result,
When the blast furnace is blown, there is a problem that clogging occurs in tanks and pipes.

Furthermore, Japanese Patent Application Laid-Open No. 10-102110 (hereinafter referred to as "prior art 2") discloses a method for injecting combustible waste into a vertical furnace. JP-A-10-10
According to the method disclosed in Japanese Patent No. 2110, the combustion state of coke and various auxiliary fuels in the raceway was observed and examined. It was pointed out that combustible waste with a particle size of 10 mm or more can be burned into the raceway of a vertical furnace that manufactures pig iron by pointing out that it is possible to burn with high combustion efficiency like coke. Combustion is blowing through.

However, according to Prior Art 2, when molding or blowing flammable waste having a synthetic resin content of less than 50%, the molded particles are easily broken, and fluff-like foreign matter is generated as in Prior Art 1. Therefore, there is a problem that clogging occurs in tanks and pipes when the blast furnace is blown.

Accordingly, an object of the present invention is to solve the conventional problems, and when a non-melting component such as paper or cardboard is mixed in a film-like synthetic resin material by 10% or more, the synthetic resin content is less than 50%. Even in this case, there is provided a granular material whose synthetic resin material is melted and solidified, and a method of blowing the granular material into a furnace, which does not generate fluff-like foreign matter that causes clogging in a tank or piping when blowing a blast furnace. It is in. Further, an object of the present invention is to provide a method for producing a granular product having a surface containing a synthetic resin material melted and solidified, which can process a synthetic resin composed of a plurality of components having different melting points and a component that does not melt at a high productivity. To provide.

[0013]

Means for Solving the Problems The present inventor has made intensive studies to solve the above-mentioned problems of the prior art. As a result, a raw material containing a non-melting component such as paper is prepared so that a synthetic resin material such as plastic composed of a plurality of components having different melting points in the range of 50 to 300 ° C. is contained at 10% or more. Raw materials prepared as above,
And, when a granular material whose surface including a synthetic resin material is melt-solidified is produced by a ring die granulator including a compression extrusion process, the granular material is formed by consolidating unmelted components such as paper to form a central portion. It has been found that the components to be melted are melted and solidified on the surface, and as a result, when the particulate matter is blown into the tuyere of the blast furnace, fluff-like foreign matters that cause clogging in tanks and pipes are not generated.

The present invention has been made on the basis of the above-described findings, and is a first example of the blast furnace injection granular material of the present invention.
Embodiments, the synthetic resin material seen including, in a high bulk density is compacted
A melt-solidified surface member covering a core member and the center member
And a cylindrical die ring with many holes
Blast furnace characterized by being manufactured by compression extrusion from
Granules for blowing .

A second aspect of the granulated material for blowing blast furnace according to the present invention is that the granulated material for blowing blast furnace has a temperature of 50 to 300 ° C.
10% or more of components having a melting point within the range
And features .

In a third aspect of the granulated material for blowing into a blast furnace according to the present invention, the synthetic resin material is a paper-containing film-like plastic.
It is characterized by containing a crack .

In a fourth aspect of the blast furnace blowing granules of the present invention, the particle size of the blast furnace blowing granules is 40 mm or less.
It is characterized by being .

According to a fifth aspect of the granulated material for blowing into a blast furnace of the present invention, the synthetic resin material is a waste plastic.
And features .

In the method for blowing blast furnace of granular material according to the present invention,
One embodiment includes a synthetic resin material and is compacted and has a high bulk density.
A central member and a melt-solidified surface covering the central member
Of cylindrical die with many holes
Pneumatically push the granules produced by compression extrusion from the hole,
It is characterized by blowing into a blast furnace .

In the method for blowing blast furnace of particulate matter according to the present invention,
In a second aspect, the granular material is in a range of 50 to 300 ° C.
It is characterized by containing 10% or more of components having melting point
And

The blast furnace blowing method for granular materials according to the present invention
The third embodiment contains a paper-containing film-like plastic.
It is characterized by the following .

In the method for blowing blast furnace of particulate matter according to the present invention,
In a fourth aspect, the particle size of the granular material is 40 mm or less.
And features.

According to a fifth aspect of the method for blowing blast furnace of particulate matter of the present invention, the synthetic resin material is a waste plastic.
It is characterized by that .

Method for Producing Granules for Blast Furnace Injection of the Invention
In a first aspect of the method, a raw material containing a synthetic resin material is supplied to a ring ring.
Using a type granulator, a cylindrical die with many holes
Center with high bulk density
A melted and solidified surface member covering the member and the central member;
Characterized by producing a granular material comprising:

Method for Producing Granules for Blast Furnace Injection of the Invention
In a second aspect of the method, the raw material is in a range of 50 to 300 ° C.
Contains at least 10% of the component having the melting point
Features .

Method for Producing Granules for Blast Furnace Injection of the Invention
In a third aspect of the method, the synthetic resin material is a paper-containing film.
It is characterized by containing a shaped plastic.

Method for Producing Granules for Blast Furnace Injection of the Invention
A fourth aspect of the method is that the particle size of the granular material is 40 mm or less.
There is a feature .

Method for Producing Granules for Blast Furnace Injection of the Invention
A fifth aspect of the method is that the ring die granulator is arranged on a circumference.
A cylindrical die ring with many holes in it and a circle
Multiple rolls rotating due to friction between cylindrical die ring
Wherein the granular material comprises a cylindrical
Grinding between the ring and multiple rolls, cylindrical
Continuously extruded from the hole of the die ring
It is characterized by being manufactured by being cut in length .

[0029]

[0030]

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of a granular material containing a synthetic resin material of the present invention whose surface is melt-solidified, a method for producing the granular material, and a method for blowing the granular material into a furnace will be described in detail. FIG. 1 shows an outline of a method for producing a granular material including a synthetic resin material of the present invention whose surface is melted and solidified. In the method of the present invention for producing a granular material having a surface melted and solidified, the granular material to be produced is a component (for example, a polyethylene film) having a melting point in the range of 50 to 300 ° C. (hereinafter, “A”). ) And other non-melting components (for example, paper) (hereinafter, referred to as “B”). A is crushed during granulation, is semi-molten by frictional heat in the step of compression extrusion, and is solidified after granulation.
It is difficult to collapse. B is the grinding during granulation described above,
In the step of compression extrusion, it is compacted to improve the bulk density of the grains. As a result, the blowing amount increases. A
May be composed of a plurality of components having different melting points in the range of 50 to 300 ° C. More preferably, the melting points of the above-mentioned components are in the range of 100-280 ° C. Melting point is 1
When the temperature is in the range of 00 to 280 ° C, the strength of the grains is sufficiently increased, and the grains are hardly disintegrated.

In the present invention, a component having a melting point in the range of 50 to 300 ° C. is contained in an amount of 10% or more.
A synthetic resin material such as plastic is blended. The reason is,
When the granulated material thus produced is ground by a ring die granulator including a grinding and compression extrusion process, the granulated material is consolidated and melt-solidified to cover the central member having a high bulk density and the central member. Surface member
For example, the contents are molded into cylindrical particles whose surfaces are compression molded and the surface is melted and solidified.As a result, when the molded particles are blown into the blast furnace tuyere, they do not generate fluffy foreign substances that cause clogging in tanks and piping. It is. In the present invention, the above-mentioned component having a melting point in the range of 50 to 300 ° C is preferably contained by 50% or more.

If the component having a melting point in the range of 50 to 300 ° C. is less than 10%, the surface is insufficiently melted and solidified, and the molded particles are broken and clogged in tanks and pipes. Fluffy foreign matter is generated.

One of the important reasons for melting and solidifying the surface of the granular material is to improve the burning efficiency of the granular material by increasing the strength of the granular material. That is, when the surface of the granular material is melted and solidified, the strength of the granular material increases. When the strength of the granular material is low, the granular material collapses during pneumatic transportation (conveyance) and is sent into the raceway with the collapsed small shape. Therefore, the residence time in the raceway is extremely short. However, the combustion efficiency is deteriorated.

More specifically, the synthetic resin material having a large particle diameter blown from the tuyere stays on the raceway in a swirling state for a long time while burning, and maintains the swirling state until it becomes small to some extent. Stay on the raceway. Thereafter, when the particle diameter becomes smaller to some extent, it scatters from the raceway. On the other hand, when the synthetic resin material having a small particle diameter is blown from the tuyere, it is immediately scattered without staying in the raceway.

Generally, the so-called terminal velocity is the particle velocity when the resistance acting on the particles moving in the fluid in the gravitational field or the centrifugal field is balanced with the propulsive force of the particles. As long as the terminal velocity of the synthetic resin material blown from the tuyere in the raceway is sufficiently higher than the flow velocity of the gas discharged from the raceway, the synthetic resin material is
It is not possible to jump out of the raceway, and during this time, it circulates and stays in the raceway, so that it can be sufficiently burned and the combustion efficiency of the synthetic resin material increases. As described above, it can be seen that the granular material whose surface including the synthetic resin material of the present invention is melted and solidified has a high combustion efficiency due to its high strength when blown into a blast furnace.

A ring-die granulator used when a raw material is prepared by blending a synthetic resin material such as plastic, and the raw material thus prepared is manufactured into granules, is ground,
And what is necessary is just to include a compression extrusion process. For example, a cylindrical die ring having a number of holes on its circumference, and a plurality of rolls that rotate due to friction between the cylindrical die ring, the raw material described above is a cylindrical die ring And a plurality of rolls, as long as the material is continuously compressed and extruded from a hole of a cylindrical die ring. During the grinding and compression extrusion steps described above, a granulate is produced comprising a central member that is compacted and of high bulk density and a melt-solidified surface member that covers the central member. In the production of the granular material, the continuously extruded material is cut into a predetermined length. The predetermined length is 40 mm or less, preferably 15 mm or less.

The synthetic resin material of the present invention may contain a paper-containing film plastic. That is,
It may contain paper, cardboard, and the like, as well as film-like plastic, which has extremely poor transportability and fluidity and has a significant problem in handling when used as a fuel.

In the present invention, it is necessary that the surface of the molded particles (granules) is melted and solidified. That is, it is important that the molded grains include a central member that is compacted and has a high bulk density and a melted and solidified surface member that covers the central member. The above-mentioned center member preferably has an average bulk density of 0.25 g / cm ³ or more. Further, the thickness of the melted and solidified surface member is preferably 1 mm or more.

In the present invention, the particle size of the molded particles is 40
mm or less, preferably 5 to 10 mm.

The granular material containing the synthetic resin material of the present invention whose surface is melted and solidified is suitable for blowing into a furnace, especially a tuyere of a blast furnace. In particular, the granular material whose surface of the present invention is melted and solidified is
At the time of pneumatic transport, the granular material does not collapse and has excellent thermal efficiency.

As described above, according to the method of the present invention, molded particles comprising a central member that is compacted and high in bulk density and a surface member that is melted and solidified and that covers the central member are produced.
Since it is blown into a blast furnace or the like, fluff-like foreign matter that causes clogging in tanks and pipes does not occur.

FIG. 2 is an enlarged view of the granular material of the present invention.
The granular material 6 is formed in a cylindrical shape, and a paper or high-melting-point plastic or the like 10 is located at a central portion in a state of being compacted,
A part 10 thereof is exposed on the surface of the granular material. The thickness 11 of the melted and solidified surface member 9 is 1 mm or more. The melted and solidified surface member accounts for at least 10%, preferably at least 50%, of the surface area of the granular material.

[0044]

The method of the present invention will be described in comparison with a comparative example. First, the granular material of the present invention was compared with a granular material obtained by a conventional melt granulation method. Conventional melt granulation method, that is, synthetic resin is cut or crushed by a rotary blade rotating at high speed, and the synthetic resin material is semi-molten by friction heat due to cutting or crushing, and the semi-melted synthetic resin material is Further, the solidified material is shrunk and solidified by rapid cooling, and the granular material obtained by the method of crushing with a rotary blade at the same time as the shrinking and solidifying described above is blown from a blast furnace tuyere. The residence time was extremely short, and the combustion efficiency was poor. On the other hand, the granular material whose surface including the synthetic resin material of the present invention is melted and solidified has a high strength, and thus stays in the raceway for a long time,
Thermal efficiency was good.

Next, the granules of the present invention produced by a ring die granulator were compared with granules outside the scope of the present invention. That is, as shown in Table 1, the melting point is 50-30.
The mixing ratio of the component A (crushed polyethylene film debris for packing) and the other non-melted component B (cardboard debris) within the range of 0 ° C. is 0/100, 3/97, 8
/ 92, 10/90, 15/85, 50/50,
Raw materials were prepared by changing the ratio to 95/5 and 100/0.

Next, using the raw materials thus prepared, molded granules (granules) were produced by a ring die granulator including grinding and compression extrusion steps. The molding temperature at that time was 100 ° C. The grain strength (the strength when the grain strength was taken as 100) and the bulk density (T / m ³ ) of the produced molded grains were examined. The results are shown in Table 1. The particle size of the molded particles (granules)
The length was 6 mm and the length was 10 mm. Further, the thicknesses of the melted and solidified surface members are respectively: 0 mm,: 0.1
mm,: 0.5mm,: 1.0mm,: 1.5m
m, 2.0 mm, 2.3 mm, 3.0 mm
Met.

The molded particles produced in this way were blown from the tuyere during operation through a pneumatic supply facility, and the occurrence of troubles such as clogging in the facility was examined. (A) That is, the above-mentioned formed granules charged in the storage silo are quantitatively cut out from the silo, transferred to a pneumatic supply facility, and the formed granules are transferred from the pneumatic supply facility to the tuyere of the blast furnace under the following conditions. Pneumatically blown into the furnace. Pneumatic gas: air Pneumatic gas blowing amount: 1200 Nm ³ / hr Blowing amount of molded particles: 62.5 kg / min Solid-gas ratio: 2.4 kg / kg

(B) The blast furnace operating conditions at this time were as follows. Tapping rate: 9000 t / day Blast rate: 7260 Nm ³ / hr Oxygen enrichment rate: 4% Blast temperature: 1200 ° C. Coke ratio: 447 kg / t. pig Pulverized coal injection amount: 100 kg / t. pig Injection of molded particles: 10 kg / t. pig Injection of the above-mentioned shaped particles in the furnace was performed for 2 days.

As a result, when molded grains containing no component A (crushed polyethylene film for packing) having a melting point in the range of 50 to 300 ° C. were used, the bulk density was 0.7%.
Grain strength is as low as 25, but high as 9
More than one clogging occurred. Even when molded grains containing 3% of component A (crushed polyethylene film for packing) having a melting point in the range of 50 to 300 ° C are used, the grain strength is as low as 35, and once every 6 hours. The above clogging occurred. Further, even when a molded particle containing 8% of the component A (crushed polyethylene film for packaging) having a melting point in the range of 50 to 300 ° C. is used, the particle strength is still 60%.
And clogging occurred one or more times in 12 hours. In the above-described molded particles, the thickness of the melted and solidified surface member was less than 1 mm.

On the other hand, when 10%, which is the lower limit of the range of the present invention, of component A (crushed polyethylene film for packing) having a melting point in the range of 50 to 300 ° C. The strength is relatively strong at 75,
The clogging was reduced to less than once within 12 hours. When 15% of component A (crushed polyethylene film for packing) having a melting point in the range of 50 to 300 ° C. is used, the grain strength becomes as high as 80, and the clogging is reduced to once or less in one day. Got lower. When 50% of the component A (crushed polyethylene film for packing) having a melting point in the range of 50 to 300 ° C. is used, the grain strength becomes as high as 90, and the clogging is reduced to once or less within two days. Very few. The operation of the blast furnace itself was not affected at all. When 95% of component A (crushed polyethylene film for packaging) having a melting point in the range of 50 to 300 ° C. is used, the grain strength is further increased to 98, and clogging is not more than once in two days. And very few. The operation of the blast furnace itself was not affected at all. Furthermore, when 100% of the component A (crushed polyethylene film for packing) having a melting point in the range of 50 to 300 ° C. is used, the grain strength is 100, and clogging is not more than once in two days. And very few. In addition, even when the bulk density was 0.30 or 0.33, the number of times of clogging was extremely small as long as the conditions regarding the melting point were satisfied.

As is clear from the above description, the frequency of clogging is greatly affected by the content of the component A having a melting point in the range of 50 to 300 ° C.

[0052]

As described above, according to the method of the present invention for producing a granular material containing a synthetic resin material whose surface has been melted and solidified, a method for producing the granular material, and a method for blowing the granular material into a furnace, plastics and other synthetic resins are used in the form thereof. Regardless of the above, the fuel can be supplied as blown fuel for a blast furnace or the like, so that a large amount of waste synthetic resin can be treated and effectively used. Further, the fuel cost of a blast furnace or the like can be significantly reduced. Furthermore, when blowing into the blast furnace, fluff-like foreign substances that cause clogging in tanks and pipes are not generated, so that the fluidity, transportability and combustibility of the synthetic resin supplied to the furnace can be effectively improved, and In such cases, the synthetic resin material can be appropriately supplied into the furnace as fuel without hindering the operation of the furnace.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a method of the present invention.

FIG. 2 is an enlarged view of the granular material of the present invention.

FIG. 3 is a table 1 showing a blowing trouble and a property of a molded particle according to a raw material mixing ratio.

[Explanation of symbols]

 1. Cardboard 2. 2. film plastic Cardboard waste 4. 4. Film-shaped plastic pieces Ring die granulator 6. Granules 7. Roll 8. 8. Cylindrical die ring 9. Melted solidified surface of molded particles 10. Compression molded center member Thickness of melt-solidified surface member

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI // F23G 7/12 ZAB F23G 7/12 ZABZ (72) Inventor Shuo Terada 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Inside (72) Inventor Kenichi Nemoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Kunihiko Tange 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. ( 56) References JP-A-10-130422 (JP, A) JP-A-62-591 (JP, A) JP-A-2-160088 (JP, A) JP-A-9-137926 (JP, A) Hei 10-102110 (JP, A) JP-A-60-235632 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08J 3/12-3/16 C10L 5/48 C21B 5 / 00 F23K 3/02 F23G 7/12

Claims (15)

(57) [Claims] 1. A material containing a synthetic resin material, which is compacted and has a high bulk density.
A central member and a melt-solidified surface covering the central member
Cylindrical die ring with many holes
Characterized by being manufactured by compression extrusion through holes
Granules for blast furnace injection . 2. The blast furnace blowing granules are preferably 50 to 30.
Containing at least 10% of a component having a melting point in the range of 0 ° C.
The blast furnace injection particles according to claim 1, wherein
Stuff 3. The synthetic resin material is a paper-containing film-like plastic.
The composition according to claim 1, wherein the composition contains a plastic.
3. Granules for blast furnace injection according to 2 . 4. A particle size of the granulated particles for blowing into a blast furnace is 40 m.
m or less.
The granules for blowing into a blast furnace according to any one of the above . 5. The synthetic resin material is a waste plastic.
5. The method as claimed in claim 1, wherein:
4. A granulated product for blast furnace injection according to any one of the above. 6. A material containing a synthetic resin material, which is compacted and has a high bulk density.
A central member and a melt-solidified surface covering the central member
Cylindrical die ring with many holes
Pneumatically extruded granules produced by compression extrusion through holes
Blast furnace, characterized by being blown into the blast furnace
Only way. 7. The method according to claim 1, wherein the granular material is in the range of 50 to 300 ° C.
Containing at least 10% of a component having a melting point of
The blast furnace blowing method according to claim 6, which is characterized in that: 8. A paper-containing film-shaped plastic resin.
7. The composition according to claim 6, which contains a plastic.
8. A method for blowing blast furnace into particulate matter according to 7 . 9. The particle size of the granular material is 40 mm or less.
The method according to any one of claims 6 to 8, wherein
A blast furnace blowing method for the particulate matter described in the above. 10. The synthetic resin material is a waste plastic.
10. The method according to claim 6, wherein:
The blast furnace blowing method according to one of the above. 11. A raw material containing a synthetic resin material is supplied to a ring die.
Cylindrical dielin with many holes using a granulator
The center part is compressed and extruded from the hole of
Such as surface material that has been melted and solidified to cover the material and the central member
For blast furnace injection, characterized by producing granular materials consisting of
A method for producing a granular material. 12. The method according to claim 11, wherein said raw material is in the range of 50 to 300 ° C.
Containing at least 10% of a component having a melting point of
Production of granules for blast furnace injection according to claim 11
Method. 13. The synthetic resin material is in the form of a paper-containing film.
12. The composition according to claim 11, further comprising a plastic.
13. The method for producing granulated material for blast furnace blowing according to item 12 . 14. A particle having a particle size of 40 mm or less.
14. The method according to claim 11, wherein:
A method for producing a granulated material for blast furnace injection according to one of the above aspects. 15. The ring die granulator is arranged on a circumference.
Cylindrical die ring with many holes and cylindrical
Multiple rolls rotating due to friction between the shape die ring
The granular material is obtained by converting the raw material into a cylindrical die.
Grinding between the ring and the rolls, the cylindrical
It is continuously compressed and extruded from the hole of the die ring,
12. The semiconductor device according to claim 11, which is manufactured by being cut at a distance.
2. The method for producing granulated material for blowing into a blast furnace according to item 1 .