JP2008266411A - Method for producing coke for blast furnace with waste plastic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing coke for blast furnaces, comprising mixing dust coal with waste plastics, press-molding the mixture, charging the obtained cob coal and large particle coal in a coke oven, and then carbonizing the mixture, by which the amount of the waste plastics treated can be increased, while preventing the deterioration in the quality of the coke. <P>SOLUTION: This method for producing the coke for the blast furnaces with the waste plastics comprises drying blended coal, then or simultaneously classifying into dust coal and large particle coal, mixing the obtained dust coal heated at ≥120°C with crushed and sieved general waste plastics having sizes having the largest thickness of ≤0.8 mm and the largest length of ≤15 mm, hot press-molding the mixture into cob coal, mixing the cob coal with the large particle coal, and then charging and carbonizing the mixture in a coke oven. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for treating waste plastic using a coke oven, and more particularly, to a method for treating waste plastic for effectively reusing waste plastic in a blast furnace coke manufacturing process in the steel industry.

  Conventionally, most of waste plastic discharged as industrial waste and general waste has been landfilled, and part of it has been incinerated. However, in landfill disposal of waste plastic, it is not decomposed by bacteria and bacteria in the soil, and in the incineration process, the calorific value is large, so that the incinerator is damaged and adheres to general waste. Corrosion due to chlorine in exhaust gas generated from salinity and chlorine-containing waste plastics such as polyvinyl chloride is a problem.

  In addition, such a disposal method is expected to have a shortage of landfill sites in the future, and effective reuse of waste plastics is desired from the viewpoint of exhaust gas treatment and environmental problems.

  In view of the problems of the above processing method, as a method of effectively using the waste plastic, the waste plastic is charged into a coke oven together with coal and reused.

  For example, when reusing waste plastic in a coke oven, after compression molding the waste plastic into a plastic granulated product with an apparent density of 0.40 to 0.95 kg / liter and a particle size of 5 to 80 mm, There has been proposed a method of suppressing reduction in coke strength and product yield by using waste plastic by mixing at a ratio of 5% by mass or less with respect to coal and performing carbonization in a coke oven (for example, Patent Document 1). ,reference).

  In addition, when the waste plastic is mixed with coal in a coke oven and carbonized, the average particle size of the waste plastic is controlled in order to suppress the reduction in coke strength due to the diffusion of the residue generated by the carbonization of the waste plastic. A method has been proposed in which the diameter is 10 times or more that of coal, and the average particle diameter of coal is 0.6 to 2.0 mm (for example, see Patent Document 2).

  These methods are for mixing pulverized coal having an average particle size of 3 mm or less or an average particle size of 0.6 to 2.0 mm with waste plastic and suppressing reduction in coke strength when carbonizing in a coke oven. The particle size of the waste plastic is optimized with respect to the average particle size of the pulverized coal, or the apparent density of the waste plastic is optimized by compression molding.

  However, many of the general waste plastics collected by the normal container and packaging recycling method are thin and fluffy, and in order to adjust the average particle size and apparent density of general waste plastics by these methods, Since it is necessary to increase the particle size by shearing the waste plastic and reducing the volume, etc., there is a problem that the handling property of the waste plastic is lowered and the workability is lowered.

  In addition, when pulverized coal and waste plastic are mixed and carbonized in a coke oven, the coal particles and waste plastic are carbonized in contact with each other. By optimization alone, it is difficult to sufficiently suppress the inhibition of adhesion between soft and molten coal particles during dry distillation due to gasification and residue of waste plastic.

  For this reason, in order to suppress the fall of coke intensity | strength, the compounding ratio of the waste plastic with respect to coal must be restrict | limited.

  In addition, in the method of mixing these pulverized coal and waste plastic and carbonizing in a coke oven, there is a problem of reduction in coke strength due to deterioration in handling property of waste plastic and inhibition of adhesion between soft and molten coal particles during carbonization. As a method for improving the above, there has also been proposed a method in which pulverized coal after pulverizing coal and waste plastic are mixed and molded.

  When pulverized coal and waste plastic are mixed and molded into agglomerated coal, and agglomerated coal and other coarse coal are dry-distilled in a coke oven, waste plastic gasification and residues are generated in the agglomerated coal. And it can suppress inhibiting the adhesion | attachment by soft-melting of agglomerated coal or agglomerated coal and coarse-grained coal.

  For example, waste plastic and tar binder are added to pulverized coal of 0.3 mm or less after pulverizing coal, mixed, then pressure-molded to form agglomerated coal, and other coarse particles larger than 0.3 mm After mixing with charcoal, in order to suppress reduction in coke strength due to waste plastic when carbonized in a coke oven, the particle size of waste plastic mixed with pulverized coal is 0.8 mm or less and / or thickness 0 A method has been proposed in which the length of a film-like waste plastic is 15 mm or less (for example, see Patent Document 3).

  However, in this method, since the mixture of pulverized coal and waste plastic is pressure-molded at room temperature, there is a springback gap between the waste plastic in the agglomerated coal and the surrounding coal particles during molding. This produces a problem of reducing the apparent density of the agglomerated coal.

  Formation of voids in the agglomerated coal during molding causes a reduction in coke strength along with voids generated by gasification of waste plastic in the agglomerated coal during dry distillation. In addition, the reduction in the apparent density of the agglomerated coal makes it difficult to sufficiently improve the coke strength by reducing the bulk density when charging the agglomerated coal and other coarse coal into the coke oven.

  On the other hand, coal, waste plastics, and binders are used to improve the forming rate and cold strength of coal when the coal is mixed with granular waste plastic and a binder and pressed to produce coal. Has been proposed that is heated and kneaded at a temperature higher than the softening temperature of the waste plastic and lower than the melting point, specifically 80 to 100 ° C., and pressure-molded at this temperature (for example, Patent Document 4). ,reference).

  When processing general waste plastics collected by the Containers and Packaging Recycling Law using this method, since general waste plastics contain polyethylene with a low melting point of 100 to 120 ° C. as a main component, heating The temperature is limited to 120 ° C. or less at the highest.

  However, at this temperature, other main components in general waste plastics, such as polystyrene and polypropylene, are lower than the softening temperature, so there is a gap between the waste plastic in the agglomerated coal and the surrounding coal particles during molding. It is not possible to sufficiently suppress the generation of voids due to the spring back and the decrease in the apparent density of the agglomerated coal.

  Therefore, the coke strength obtained by dry distillation of the agglomerated coal obtained by this method and other coarse-grained coal could not be sufficiently improved.

JP 2001-49261 A JP 2001-49263 A JP 2003-238967 A JP 2000-319674 A

  In the present invention, based on the above-described state of the art, pulverized coal and waste plastic are mixed, agglomerated coal and coarse coal obtained by pressure molding are charged into a coke oven, and dry-distilled to produce coke for blast furnace. An object of the present invention is to increase the processing amount of waste plastic while suppressing the reduction of coke strength during production.

  This invention solves the said subject, and the place made into the summary is as follows.

  (1) After the blended coal is dried or simultaneously with drying, it is classified into pulverized coal and coarse coal, and the maximum thickness is 0.8 mm by pulverization and sieving into pulverized coal having a temperature of 120 ° C. or higher. Hereinafter, after adding general waste plastic having a maximum length of 15 mm or less, mixing, hot pressing to form agglomerated coal, the agglomerated coal and the coarse coal are mixed, and a coke oven A method for producing coke for blast furnace using waste plastic, characterized in that it is charged in a dry distillation process.

  (2) The method for producing coke for blast furnace using the waste plastic according to (1), wherein the temperature of the pulverized coal is 150 ° C or higher.

  (3) The method for producing coke for blast furnace using the waste plastic according to (1) or (2), wherein the temperature of the pulverized coal is 250 ° C. or less.

  (4) Addition of the waste plastic is 10% by mass or less with respect to pulverized coal, and the blast furnace coke using the waste plastic according to any one of (1) to (3) Production method.

  (5) Any one of (1) to (4), wherein the mass% of the agglomerated coal with respect to the total charge (total amount of agglomerated coal and coarse coal) is 30% by mass or less. A method for producing coke for blast furnace using the waste plastic described in 1.

  According to the present invention, it is possible to suppress a reduction in coke productivity when processing waste plastic in a coke oven, and to increase the waste plastic addition rate while suppressing adverse effects on coke production. It is possible to provide a method for treating waste plastic in a coke oven.

  Details of the present invention will be described below.

  An example of an embodiment of the present invention will be described with reference to FIG.

  The crushed raw coal 1 is heated and dried by a drying / classifying device 2 and classified into coarse coal 3 having a particle size of more than 0.5 mm and pulverized coal 4 having a particle size of 0.5 mm or less. The

  On the other hand, the general waste plastic 10 is crushed to a predetermined size by a crusher 11 in advance and sieved with a 15 mm sieve mesh, with a maximum thickness of 0.8 mm or less and a maximum length of 15 mm or less. The waste plastic 12 is used.

  The general waste plastic 12 having the above size is added to the pulverized coal 4 having a temperature of 120 to 250 ° C., the waste plastic 12 and the pulverized coal 4 are mixed using the kneader 5, and then molded using the molding machine 6. And agglomerated coal 7. Although a shaping | molding method is not specifically limited, For example, the flat agglomerate of thickness about 10 mm can be manufactured by using a flat roll type | mold agglomerator with a linear pressure of 4 ton / cm. .

  The agglomerated coal 7 is mixed with the coarse coal 3 and charged into the coke oven 9, and the entire charge 8 composed of the agglomerated coal 7 and the coarse coal 3 is dry-distilled in the coke oven 9. Coke is produced.

  When the general waste plastic 12 of the predetermined size is mixed with the pulverized coal 4 to form the agglomerated coal 7, when the carbonized coal 12 is dry-distilled with the coarse coal 3 in the coke oven, the general waste plastic 12 is directly combined with the pulverized coal 4. Compared with the case where it is mixed with granulated coal 3 and carbonized in a coke oven, the gas and residue generated from the general waste plastic 12 inhibit the fusion between coal particles of pulverized coal 4 and / or agglomerated coal 7, The phenomenon of reducing the coke strength can be suppressed.

  Further, according to the study by the present inventors, in order to suppress the fusion inhibition between coal particles due to general waste plastic during dry distillation and sufficiently improve the coke strength, general waste plastic is mixed with pulverized coal. , The temperature of pulverized coal during molding, size of general waste plastic, mass% of general waste plastic with respect to pulverized coal, and mass% of general waste plastic with respect to blended coal (total amount of pulverized coal and coarse coal) For the following reasons, it is necessary to set the proper range.

  Below, these conditions and the reason for limitation are demonstrated.

( Size of general waste plastic when molding )
Generally, general waste plastics collected under the Containers and Packaging Recycling Law consist of plastic bottles and plastic bags of various sizes. For example, the thickness is about 0.3 to 10 mm and the length is about 5 to 50 cm. Waste plastics of different thickness and length are included.

  In the present invention, using such general waste plastic, before mixing with pulverized coal and molding, the general waste plastic has a maximum thickness of 0.8 mm or less and a maximum length of 15 mm or less for the following reasons. Crush to size.

  FIG. 3 shows the relationship between the maximum thickness of the general waste plastic after crushing and the apparent density of the agglomerated coal.

Fig. 3 shows the agglomeration obtained by adding 10% of general waste plastic having a maximum length of 20 mm and a different maximum thickness to pulverized coal at a temperature of 120 ° C in a blending ratio with respect to pulverized coal, mixing and molding. The result of having measured the apparent density of charcoal is shown. The apparent density of the agglomerated coal when only pulverized coal was molded under the same conditions was about 1.1 to 1.2 (g / cm ³ ).

  As shown in FIG. 3, when the thickness of the general waste plastic exceeds 0.8 mm, the apparent density of the formed coal is greatly reduced. This is because when the thickness of the waste plastic exceeds 0.8 mm, the heat capacity becomes large, and when the waste plastic is heated to 120 ° C., the general waste plastic is sufficiently softened and difficult to melt. This is thought to be due to a decrease in the portion and an increase in the springback during molding, resulting in a gap between the pulverized coal particles in the agglomerated coal and the waste plastic.

  On the other hand, when the thickness of the general waste plastic is 0.8 mm or less, the melting part of the main components of the general waste plastic increases and softening is also promoted, so the springback during the molding process is reduced, and pulverized coal and Adhesiveness with general waste plastic is improved, and an apparent density almost equivalent to agglomerated coal only of pulverized coal can be obtained.

  FIG. 3 shows the apparent density of the agglomerated coal under the condition that the maximum length of the general waste plastic is 20 mm. From FIG. 3, even if the length of the general waste plastic exceeds 15 mm, the thickness Is within the proper range (0.8 mm or less), it can be seen that the apparent density of the agglomerated coal does not decrease, and an apparent density substantially the same as that of the agglomerated coal only of pulverized coal can be obtained.

  Fig. 4 shows the general waste plastic when the agglomerated coal obtained by mixing general waste plastics of different lengths with pulverized coal and press-molding is mixed with coarse coal and charged into a coke oven. And the bulk density of all the charged materials (agglomerated coal and coarse coal).

  The maximum thickness of general waste plastic is 0.8 mm (constant), the proportion of general waste plastic to pulverized coal is 10% by mass, the temperature of pulverized coal during mixing and molding is 120 ° C., the total charge ( The blending ratio of the agglomerated coal in the total of agglomerated coal and coarse coal was 30% by mass.

  As described above, the influence of the apparent density of the agglomerated coal due to the length of the general waste plastic is small. However, as shown in FIG. 4, when the length of the general waste plastic exceeds 15 mm, The bulk density of coal and coarse coal is greatly reduced.

  This is because when the length of the general waste plastic exceeds 15 mm, the proportion of the waste plastic exposed to the outside of the agglomerated coal increases, and the exposed general waste plastic becomes charged charcoal (of agglomerated coal and coarse coal). It is thought that the bulk density was reduced. The reduction in the bulk density of the charged coal (total of agglomerated coal and coarse coal) causes a reduction in coke strength.

  In addition, when the length of the general waste plastic increases and the portion of the general waste plastic exposed to the outside of the agglomerated coal increases, the gas or residue generated from the exposed portion of the general waste plastic during carbonization in the coke oven Is not preferable because it inhibits the softening and fusion of the agglomerated coals or between the agglomerated coals and the coarse coals, and the coke strength decreases.

  Based on the above results, in the present invention, in order to suppress the reduction in coke strength, before mixing with pulverized coal and molding, the general waste plastic has a maximum thickness of 0.8 mm or less and a maximum length. Crush to a size of 15 mm or less.

  In the present invention, a general waste plastic having a maximum length of 15 mm or less means a general waste plastic under a sieve when the general waste plastic is crushed and then sieved using a 15 mm sieve.

( Temperature of pulverized coal during molding )
Generally, general waste plastics collected under the Containers and Packaging Recycling Law consist of plastic bottles and plastic bags made of various main components.

  An example of main components of general waste plastic is shown in FIG.

  Note that the melting point of each major component of the plastic shown in FIG. 2 varies depending on the additive component other than the main component and the molecular weight, so FIG. 2 shows the melting point range from the lowest temperature to the highest temperature of each major component. showed that.

  As shown in FIG. 2, the melting point varies greatly depending on the main components of general waste plastic. For example, the melting point of polyethylene (PE) is 120 to 150 ° C, the melting point of polypropylene (PP) is 130 to 180 ° C, the melting point of polystyrene (PS) is 220 to 260 ° C, and the melting point of polyethylene terephthalate (PET) is 210 to 280 ° C. Polyvinyl chloride (PVC) has a melting point of 180 to 290 ° C.

  The content of main components of general waste plastics varies depending on the collection, but on average, polyethylene (PE): about 30%, polypropylene (PP): about 20%, polystyrene (PS): about 25% Polyethylene terephthalate (PET): about 10%, polyvinyl chloride (PVC): about 5%, others: 10%.

  In the present invention, when using the general waste plastic having the composition of such main components, crushing the general waste plastic having the above optimum size, mixing with pulverized coal, and molding, for the following reasons, The temperature of pulverized coal is set to 120 ° C. or higher.

  FIG. 5 shows the relationship between the temperature of pulverized coal when the general waste plastic is mixed with pulverized coal and formed, and the apparent density of the agglomerated coal.

  In FIG. 5, when general waste plastic having a maximum pressure thickness of 0.8 mm and a maximum length of 15 mm is added in a blending ratio with respect to pulverized coal (●), general waste plastic is not added (only pulverized coal only). In the case of (), the apparent density of the obtained agglomerated coal is measured, and the result of comparing the two is shown.

  When 10% of general waste plastic is added to pulverized coal at room temperature (25 ° C) in the blending ratio to pulverized coal (●), when general waste plastic is not added (only pulverized coal) ( Compared with ○), the apparent density of the agglomerated coal is significantly reduced, but the apparent density of the agglomerated coal increases as the temperature of the pulverized coal increases.

  As a result, when the temperature of the pulverized coal is 200 ° C. or higher, the apparent density of the agglomerated coal is almost the same as that in the case where the general waste plastic is not added (only pulverized coal) (◯).

  This is because the temperature of the pulverized coal increases, and among the main components of general waste plastic as shown in FIG. 2, main components having a relatively low melting point such as polyethylene (PE) and polypropylene (PP) melt. Since the main components of the material are sufficiently softened, the springback during the molding process is reduced, the gap between the pulverized coal particles and the waste plastic is reduced, and particularly in the molten part, the adhesion between the waste plastic and the pulverized coal particles is reduced. It is considered that the apparent density of the agglomerated coal has increased.

  FIG. 6 shows the temperature of pulverized coal when general waste plastic is mixed with pulverized coal, and the bulk density when charging the obtained agglomerated coal with coarse coal and charging it into a coke oven. Shows the relationship.

Moreover, in FIG. 7, the general waste plastic is mixed with pulverized coal, the temperature of pulverized coal at the time of molding, and the obtained agglomerated coal is mixed with coarse coal, charged into a coke oven, and dry-distilled. It shows the relationship between the intensity DI ^0.99 ₁₅ resulting coke.

  In addition, mixing and shaping | molding with the general waste plastic in FIG. 6 and FIG. 7 and pulverized coal are performed on the same conditions as the conditions demonstrated in FIG. 5, and the whole charge of agglomerated coal (total of agglomerated coal and coarse coal The ratio to the amount was 30% by mass.

  As shown in FIG. 6, the general waste plastic is mixed with pulverized coal, and the temperature of the pulverized coal at the time of molding increases, and the apparent density of the agglomerated coal increases (see FIG. 5). The charging bulk density is also increased.

  In addition, as shown in FIG. 7, the temperature of the pulverized coal increases when the general waste plastic is mixed with the pulverized coal, and the apparent density of the agglomerated coal increases (see FIG. 5). Since the bulk density increases (see FIG. 6), the strength of the coke is also increased.

  Based on the examination results shown in FIGS. 5 to 7, the main components (see FIG. 2) having a relatively low melting point such as polyethylene (PE) and polypropylene (PP) among the main components of general waste plastics are melted. By optimizing the main components sufficiently, the springback during molding is reduced, the gap between the pulverized coal particles and the waste plastic particles is reduced, and the adhesion between the waste plastic and the pulverized coal particles is improved. The temperature of the pulverized coal when the general waste plastic of the size is mixed with the pulverized coal and pressure-molded is set to 120 ° C. or higher.

As a result, the waste plastic and pulverized coal are agglomerated, mixed with coarse coal and dry-distilled in a coke oven, so that the gas and residue generated from the waste plastic are pulverized coal and coarse coal, or coarse coal. In addition to the conventional effect of suppressing the fusion between each other,
(A) Since the apparent density of the agglomerated coal is increased, the charging bulk density when the agglomerated coal and coarse coal are mixed and charged into the coke oven is improved.
(B) Since the general waste plastic and pulverized coal in the agglomerated coal are in close contact with each other and the average interval between the pulverized coal particles is short, when the agglomerated coal is softened and melted, the gas generated from the general waste plastic causes agglomeration. The agglomerates expand due to an increase in the internal pressure of the aerated coal, and fusion between agglomerated coals or agglomerated coal and coarse coal particles is promoted,
(C) Since the average size of the voids in the agglomerated coal is small, at the time of softening and melting, the pulverized coal particles in the softened and molten state surrounding the voided plastic after invading the waste plastic enter into the voids after coking. Reduction of coarse pores in agglomerated coal,
By the synergistic action such as the above, at the time of softening and melting, the agglomerated coals or the agglomerated coals and the coarse coal particles are sufficiently fused to obtain coke having higher strength.

  The apparent density of agglomerated coal is improved. And the coal bulk density at the time of charging this forming coal into a coke oven increases, and it becomes possible to fully improve the coke strength after dry distillation.

  Further, in order to further enhance the synergistic effect and more stably improve the strength of coke, the temperature of pulverized coal at the time of mixing and pressure-molding general waste plastic with pulverized coal is 150 ° C. or higher. It is preferable that the temperature is 200 ° C. or higher.

  On the other hand, the upper limit of the temperature of the pulverized coal when the general waste plastic is mixed with the pulverized coal and press-molded is not particularly limited from the viewpoint of improving the coke strength.

  However, when the temperature of the pulverized coal exceeds 250 ° C., when the general waste plastic is mixed with the pulverized coal and subjected to pressure molding, polyvinyl chloride (PVC) (one of the main components of the general waste plastic) ( The thermal decomposition of FIG. 2) increases the amount of hydrogen chloride gas generated and causes corrosion of the equipment, which is not preferable. Therefore, for the purpose of suppressing deterioration due to corrosion of equipment, it is preferable that the temperature of pulverized coal when general waste plastic is mixed with pulverized coal and pressure-molded is 250 ° C. or less.

  As described above, the coke strength can be improved by mixing the general waste plastic with the pulverized coal and limiting the temperature of the pulverized coal during molding and the size of the general waste plastic to the range specified in the present invention. It becomes possible.

  However, as the mass percent of general waste plastics with respect to pulverized coal increases, molding becomes difficult, the yield of molded coal decreases, the apparent density of agglomerated coal decreases, and when charging into a coke oven. By reducing the bulk density, the coke strength is reduced.

  If the mass% of the general waste plastic with respect to the pulverized coal exceeds 10 mass%, the yield of the formed coal is greatly reduced, and the coke strength required as blast furnace coke is stably secured by reducing the charged bulk density. It becomes difficult. For this reason, it is preferable that the upper limit of the mass% with respect to pulverized coal of a general waste plastic shall be 10 mass%.

  In addition, the mass percentage of the entire agglomerated charge (the total amount of agglomerated coal and coarse coal) increases, and the bulk density at the time of charging into the coke oven decreases, thereby reducing the coke strength. To do.

  If the mass% of the whole agglomerated charge (total quantity of agglomerated coal and coarse coal) exceeds 30% by mass, the charged bulk density decreases and the coke strength required for blast furnace coke is stabilized. It will be difficult to secure. For this reason, the mass% with respect to the total charge (the total amount of agglomerated coal and coarse coal) of agglomerated coal shall be 30 mass% or less.

  The effects of the present invention will be demonstrated below by examples.

  Using general waste plastics with the main component composition shown in Table 1 and coal A having the coal properties shown in Table 2, the general waste plastic crushing conditions shown in Table 3 (maximum thickness and maximum length of general waste plastics), fine powder Mixing with charcoal, molding conditions (temperature of pulverized coal, mass% of general waste plastic based on pulverized coal), coke oven charging conditions (total charge of agglomerated coal (total amount of agglomerated coal and coarse coal) Agglomerated coal and coke were produced.

  The raw coal is pulverized coal A having the coal properties shown in Table 2, fine coal having a particle size of 0.3 mm or less, and coarse coal having a particle size of more than 0.3 mm (particle size: 3 mm, 85% by mass under sieve). And 0.3 mm sieve was cut).

  Molding of the mixture of general waste plastic and pulverized coal is performed by pressing the sample with a flat roll agglomerator at a linear pressure of 4 tons / cm to produce a plate-shaped coal with a thickness of about 10 mm, The apparent density was measured.

The bulk density of the entire charge of bulk coal and coarse coal was measured according to ASTM D291-86. The dry distillation of the lump coal and coarse coal is performed using a coke test furnace (coal charging amount per charge: about 80 kg), and the cold strength of the obtained coke is 150 rotations using a JIS drum tester. It measured by mass ratio (DI ¹⁵⁰ ₁₅ ) of ₁₅ mm or more of later sieves.

  Table 3 shows the results of measuring the apparent density of the obtained agglomerated coal, the bulk density when charging the coke oven, and the strength of the coke.

As shown in Table 3, the maximum thickness and maximum length of general waste plastic, mixing, and the temperature of pulverized coal at the time of molding conditions satisfy the range specified in the present invention. In invention examples 1 to 4, these conditions are No. Compared to the comparative examples of 5-8, with DI ¹⁵⁰ ₁₅ an excellent cold strength of 84.9 was obtained.

It is a figure which shows an example of embodiment of this invention. It is a figure which shows an example of the main component of general waste plastics. It is a figure which shows the relationship between the maximum thickness of general waste plastic, and the apparent density of agglomerated coal. It is a figure which shows the relationship between the maximum length of a general waste plastic, and the bulk density of all the charges (agglomerated coal and coarse-grained coal). It is a figure which shows the relationship between the temperature of the pulverized coal at the time of mixing molding, and the apparent density of the agglomerated coal containing a general waste plastic. It is a figure which shows the relationship between the temperature of the pulverized coal at the time of mixing molding, and the bulk density of all the charging materials (agglomerated coal and coarse-grained coal). It is a figure which shows the relationship between the temperature of the pulverized coal at the time of mixing molding, and the cold intensity | strength of the coke obtained by dry distillation of all the charging materials (agglomerated coal and coarse coal).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coking coal 2 Drying and classification apparatus 3 Coarse coal 4 Pulverized coal 5 Kneading machine 6 Molding machine 7 Agglomerated coal 8 Whole charge (agglomerated coal and coarse coal)
9 Coke oven 10 General waste plastic 11 Crusher 12 General waste plastic with maximum thickness 0.8mm or less and maximum length 15mm or less

Claims (5)

  After the blended coal is dried or simultaneously with drying, it is classified into pulverized coal and coarse coal, and the pulverized coal having a temperature of 120 ° C. or higher is crushed and sieved, and the maximum thickness is 0.8 mm or less. General waste plastic with a length of 15 mm or less is added, mixed, hot pressed to form agglomerated coal, then the agglomerated coal and the coarse coal are mixed and charged into a coke oven. A method for producing coke for blast furnace using waste plastic, characterized in that it is carbonized.   The method for producing coke for blast furnace using waste plastic according to claim 1, wherein the temperature of the pulverized coal is 150 ° C or higher.   The method for producing coke for blast furnace using waste plastic according to claim 1 or 2, wherein the temperature of the pulverized coal is 250 ° C or lower.   The method for producing coke for a blast furnace using the waste plastic according to any one of claims 1 to 3, wherein the waste plastic is added in an amount of 10% by mass or less based on pulverized coal.   The mass% with respect to the total charge (the total amount of agglomerated coal and coarse coal) of the agglomerated coal is 30% by mass or less, according to any one of claims 1 to 4. A method for producing coke for blast furnace using waste plastic.

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