JP4857540B2 - Method for producing coking coal and method for producing coke - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method for producing coal that is produced by press-molding coal powder into a fixed shape, and a method for producing coke using the coal.

  In recent years, plastics and other synthetic resins have been increasing as industrial waste and general waste, and the treatment has become a serious problem both socially and environmentally. In particular, plastics, which are polymeric hydrocarbon compounds, generate a large amount of heat during combustion, and there are problems such as damaging the furnace wall when incinerated. Therefore, most of them are currently disposed of in landfills. However, the dumping of plastics and the like brings about a decrease in the landfill of the landfill site and is not preferable from the viewpoint of environmental measures. In addition, with the increase in treatment costs, a shortage of land for landfill sites is becoming a social problem. For this reason, the development of a process that can be processed without discarding a large amount of synthetic resins is eagerly desired and researched in various fields.

Regarding recycling of waste plastic, a method of using waste plastic mixed with coal is known. For example, it is a method of charging waste plastic previously mixed with coal into the lower part of the coke oven carbonization chamber, and by charging the waste plastic together with the formed coal into the lower part or the whole of the coke oven, the gas generated during dry distillation There is known a method for producing coke for blast furnace, which is characterized by reducing the pressure and suppressing the coke quality deterioration (see, for example, Patent Document 1). Also, it is known that when granular plastic is mixed with charging coal and charged into a coke oven and dry-distilled, the granular plastic melts and acts as a glue to bond the charged coal, and high-quality coke can be produced. (For example, refer to Patent Document 2). In addition, a method is known in which waste plastic that has undergone volume reduction treatment is mixed with coal to produce coal, and coal is blended with coal and charged into a coke oven for dry distillation (for example, , See Patent Document 3). Furthermore, a method is known in which waste plastic and heavy oil are heated and mixed at a high temperature (200 to 500 ° C.) and polymerized to be charged into a coke oven as a coal caking aid (for example, patent literature). 4).
JP 2002-47493 A JP-A-6-228565 JP 2003-105342 A JP 2000-53970 A

  However, when the method described in Patent Document 1 is used, when waste plastic is inserted into the bottom of the carbonization chamber, the heat absorption amount at the bottom of the carbonization chamber is large due to the decomposition heat of the waste plastic, and brick wear occurs. In addition, there is a problem that the particle size and strength of the coke charged in the bottom of the carbonization chamber are lowered, and the quality of the coke is lowered.

  Moreover, when the method described in Patent Document 2 is used, the bulk density of waste plastic is low, so the bulk density of coal charged in the coke oven is reduced, and the strength of coke produced by dry distillation of this coal is low. The coke quality is reduced. Moreover, since the bulk density is lowered as a whole, there is a problem that productivity is lowered.

  In order to improve the method described in Patent Document 2, the method described in Patent Document 3 can be used. The volume of waste plastic is reduced in advance and the bulk density is increased, so that it can be uniformly mixed with coal. However, in order to mix uniformly, physical properties such as bulk density, specific gravity, and particle size must be the same, and in the case of waste plastic, the same particle size as coal (for example, the embodiment described in Patent Document 3). In the case of a coal size of 15 mm, it is considered necessary to use coal having a particle size of about 3 mm or less as the raw material coal). Necessary and not economical. In addition, waste plastic and coal are pressed to produce cast coal. As a phenomenon, the temperature of waste plastic mixed with coal rises due to pressure molding, and the role of a binder is caused by melting. It is expected to be. However, waste plastic is a mixed state of various plastics such as polyethylene, polypropylene, polystyrene, and PET, and since the melting temperature of each plastic is different, some of the inside of the charcoal is bonded by the waste plastic, but other parts are bonded. On the contrary, the strength may decrease instead.

  As a technique that can improve the non-uniformity of the binder property due to the difference in melting temperature of various plastics as described above, a method described in Patent Document 4 is known. However, in the method described in Patent Document 4 in which a caking aid produced using such a method is added to raw coal as a coal caking agent and charged into a coke oven, the coke strength after dry distillation is improved. It is considered that the charging bulk density is lowered, and there is a problem that the production yield of coke is lowered. In addition, it is difficult to uniformly disperse and add the caking aid into the raw coal. For this reason, in Patent Document 4, coal and a caking aid (mixed binder) are heated and kneaded using a kneader, but the caking aid reacts at a high temperature (350 ° C. in the examples) in a plastic solvent. Since the polymerization treatment is performed, the softening temperature is increased, and it is considered that the same temperature is required during the heating and kneading in the kneader. For this reason, a heating and kneading facility capable of high-temperature heating and a large driving force is necessary, and the facility scale for uniformly dispersing in coal is large, which causes a problem in economy. Therefore, it is not desirable to produce coke by mixing the coking aid obtained by heating and mixing waste plastic and heavy oil with a raw material charcoal and charging it into a coke oven.

  The present invention is intended to solve the above-described problems of the prior art, and when recycling waste plastics, which are organic compounds, as a binder for molding charcoal, without reducing the yield of coke production. An object of the present invention is to provide a method for producing a coal that can improve the strength of the coal.

  Another object of the present invention is to provide a method for producing coke, which can improve the quality of coke produced using molded coal using waste plastic as a binder as a raw material.

The features of the present invention for solving such problems are as follows.
(1) The waste plastic is mixed and / or dissolved in a petroleum-based tar and / or coal-based tar solvent at a temperature of 150 ° C. to 220 ° C. to form a mixed binder, and the solvent for the waste plastic in the mixed binder the mixing ratio in a mass ratio of 0.3 to 3.0, a method for producing a molded charcoal, characterized in that press-molding engages coal and mixed in a mixed and dissolved state the mixture binder.
(2) The solvent is a heavy oil obtained after recovering light oil after distillation of petroleum-based tar and / or coal-based tar instead of petroleum-based tar and / or coal-based tar. (1) The method for producing the coal char according to (1).
(3) The method for producing a formed coal according to (1) or (2), wherein an addition ratio of the mixed binder to the coal is 1% or more and 20% or less by mass ratio.
(4) The molding according to any one of (1) to (3), wherein the mixed binder and the coal are further mixed with a solid binder and subjected to pressure molding to produce a molded coal. Charcoal manufacturing method.
(5) A method for producing coke, characterized in that the coal formed by the method according to any one of (1) to (4) is charged into a coke oven and subjected to dry distillation.
(6) A coke production method, wherein the coal formed by the method according to any one of (1) to (4) is charged into a coke oven together with the coal and subjected to dry distillation.
(7) The coke according to (5) or (6), wherein the ratio of the added coal to the coal which is the coke raw material charged into the coke oven is 1% to 40% by mass ratio Manufacturing method.

  According to the present invention, when waste plastic is mixed with coal as a binder for producing coal, it can be uniformly blended, the strength of the coal produced is increased, and the quality as coal is improved. Since the handling strength is improved, pulverization before charging the coke oven can be suppressed. When the waste plastic is mixed and / or dissolved in the solvent, it is not necessary to involve a chemical reaction such as a polymerization reaction, so that the invention can be carried out at a relatively low temperature. Moreover, the quality of the coke produced by dry distillation of the coking coal can be improved, and the coke productivity is improved by increasing the charging density of the coking coal into the coke oven. The waste plastic added to the coal is partly retained as coke, and part of it is recovered as tar, and the rest is gasified and effectively used in steelworks as coke oven gas (COG). , Advanced recycling can be achieved.

  In order to solve the above-mentioned problems, in the present invention, waste plastic is mixed and / or dissolved in a solvent such as petroleum-based and / or coal-based tar and used as a binder for molded coal. By using such a binder for molding charcoal, the waste plastic can be uniformly dispersed in the molding charcoal, and since the viscosity is increased due to the waste plastic, the strength of the molding charcoal is greatly improved. When waste plastic is mixed and / or dissolved in a solvent and the waste plastic is dispersed in the solvent molecules, the solvent molecular chains enter between the molecular chains of the waste plastic, so the bonding force between the molecular chains becomes loose, and the softening point It effectively utilizes the mechanism that the viscosity required as a binder develops due to a decrease in viscosity, and it is not necessary to perform a chemical polymerization reaction on the plastic molecule itself, so mixing and / or dissolution can be performed at a low temperature. It is possible and economical. In addition, blending the coking coal produced using the binder for coking coal of the present invention with the coke oven has the advantage that the bulk density of the raw material charged into the coke oven is improved and the productivity is increased.

  Specific means and features of the present invention will be described in detail below.

  In the present invention, in order to use waste plastic as a binder for producing coal, waste plastic is mixed in a solvent, and a solvent in which the waste plastic is mixed and / or dissolved is mixed with coal as a “mixed binder”. To produce coal.

It is desirable to use a solvent made of an organic compound that can dissolve plastic as a solvent, and has a boiling point that does not evaporate when mixed with coal to produce coal, and solids when carbonized produced coal is carbonized. It is preferably an organic compound having an aromatic residue.
Therefore, it is particularly preferable to use petroleum-based tars and / or coal-based tars, and heavy oils obtained after distillation of petroleum-based tars and / or coal-based tars and removal of light oil components can also be suitably used.

  When petroleum-based tar and / or coal-based tar or heavy oil is used as the solvent, the mixing ratio of the waste plastic to the solvent (waste plastic / solvent) in the mixed binder is 0.3 to 3.0 in terms of mass ratio. It is desirable that

  In addition, when petroleum-based tar and / or coal-based tar or heavy oil is used as the solvent, the temperature at which the waste plastic is mixed and / or dissolved in the solvent is preferably 150 ° C to 220 ° C.

  Furthermore, it is desirable that the addition ratio of the mixed binder to the coal (mixed binder / coal) is 1% or more and 20% or less by mass ratio.

  In order to increase the strength of coal after dry distillation, in addition to mixed binder and coal, solid binders conventionally used (solid pitches such as ASP and PDA) are mixed to form coal. Can also be manufactured.

  Furthermore, in the present invention, high quality coke is produced by charging the coking coal produced by the above method into a coke oven and subjecting it to dry distillation. When charging coal into a coke oven and dry distillation, charging into the coke oven together with normal raw coal (coal) and dry distillation will increase the packing density in the coke oven and improve productivity. desirable.

  It is desirable that the ratio of the added coal to the coal (coking coal), which is the coke raw material charged into the coke oven, is 1% or more and 40% or less by mass ratio.

  It is desirable that the waste plastic be used after being crushed into a size that can be easily handled as necessary to remove mixed foreign matters. Further, by forming these into a granular shape, handling becomes easy, and the bulk density of the waste plastic increases, so that the miscibility with the solvent is improved. As a method for granulating the waste plastic, a known method such as a biaxial extrusion molding method or a ring die molding method can be used.

  An embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an embodiment of the present invention, and is a coke production flow using waste plastic as a binder. The coke production process consists of a waste plastic collection process 1, a bale-packed waste plastic process 2 (unpacking), a primary crushing process 3 that crushes the crushed waste plastic to 50 mm or less, waste Sorting process 4 for sorting and removing foreign substances (metal, seto, etc.) in plastic by wind, magnetic sorting, manual selection, etc., secondary crushing process 5 for crushing waste plastic from which foreign substances have been removed to 20 mm or less, crushed waste Mixing / dissolution step 6 for mixing and / or dissolving plastic in a solvent, mixing step 7 for blending plastic mixed and / or dissolved in a solvent together with a solvent as a binder, molding step 8 for blending coal and the binder And a coke oven 9 for carbonizing the coal obtained by the molding process 8 together with the coal. The produced coke is used in the blast furnace 10 or the like.

  If the waste plastic collected in the collection step 1 is mainly film-type plastics such as confectionery bags and packaging materials, such as plastic containers and packaging, shear-type crushing in the primary crushing step 3 to facilitate handling It is desirable to crush to 50 mm or less using a machine or the like. In addition, since foreign substances other than plastic are mixed in the waste plastic, metal, glass, ceramics, etc. are formed in the sorting process 4 using a method such as wind selection, magnetic selection, manual selection, and specific gravity selection. Foreign matter that hinders the removal is removed. When the waste plastic contains a small proportion of foreign matter, such as industrial waste plastic, it is possible to reduce the load of the sorting step 4.

  Also, by molding these into granules, the handling properties of waste plastics are improved, and the bulk density of waste plastics is increased, so the mixing with solvents is improved, so twin screw extrusion molding method, ring die molding method, etc. You may shape | mold by. The average particle size of the waste plastic granules is desirably about 3 mm or more and 20 mm or less. If it is less than 3 mm, the productivity at the time of granulation is remarkably lowered, and if it exceeds 20 mm, the particles are too large and the heat conductivity is poor, and dissolution may take time.

  As the solvent used in the mixing / dissolving step 6, it is desirable to use a solvent which exists as a liquid under the conditions for mixing the waste plastic and at least hardly decomposes and whose physical properties such as viscosity are not changed. The mixing / dissolving step 6 is desirably performed while heating in order to promote the swelling and dissolution of the plastic. For this purpose, it is desirable to perform the mixing / dissolution step 6 at 60 to 250 ° C. This is because the plastic may be difficult to dissolve below 60 ° C. When the temperature exceeds 250 ° C, the components in the solvent volatilize and the composition changes, making it difficult to dissolve. It is because solubility may fall by decreasing. The optimum mixing / dissolving temperature varies depending on the type of solvent, but when petroleum-based tar and / or coal-based tar or heavy oil is used as the solvent, the mixing / dissolving temperature should be 150 ° C to 220 ° C. Particularly desirable. This is because most of the various plastics in the waste plastic reach the melting temperature in the temperature range of 150 ° C. or higher, and sufficient dissolution performance can be secured even in these solvents having relatively low waste plastic solubility. This is because the amount of volatilization increases beyond this value, so that problems such as alteration and reduction of the solvent become obvious. Under these temperature conditions, it is considered that the change due to the chemical reaction between the solvent molecule and the plastic molecule is small, and as a form, it is considered that the polymer chain of the waste plastic is dispersed in the solvent. For this reason, the softening temperature of waste plastic falls and it becomes a softening temperature suitable as a binder for molding charcoal.

  The selection of the solvent depends on the mixing / dissolution temperature. For example, in addition to coal tar, heavy oil extracted from the coal tar atmospheric distillation column, heavy oil residue, heavy coal oil, specific oil type (aroma such as kaffji) Petroleum-based vacuum residue, ethylene bottom oil, reformed oil, FCC oil and the like from those having a large group component) can be used. A blend oil of the above residual oil such as carbon black oil is also desirable. Furthermore, among the waste plastics to be supplied, the specific gravity of vinyl chloride, polystyrene, and PET is 1.0 or more, and the specific gravity of polyethylene, polypropylene, etc. is 1.0 or less. Therefore, considering uniform mixing in the solvent, The specific gravity is preferably in the range of 0.9 to 1.2. In the mixing / dissolving step 6, it is preferable to mix / dissolve the waste plastic in the range of “solvent / waste plastic” in the range of 0.1-20, which is the mass ratio of the solvent to the waste plastic. When the proportion of waste plastic is too large, the effect of dispersion of solvent molecules between waste plastic molecular chains is small. Moreover, when the ratio of waste plastic is too small, the binder effect by a plastic will fall. The optimum ratio of “solvent / waste plastic” varies depending on the type of solvent and the mixing and stirring conditions. However, on the premise that sufficient mixing and stirring is performed in the preferred temperature range shown above, petroleum-based tar and / or When heavy oil obtained after distilling coal-based tar or petroleum-based tar and / or coal-based tar and taking out a light oil component, more preferable “solvent / waste plastic” is 0.3 to 3.0. Range. When these solvents are used, particularly when “solvent / waste plastic” is less than 0.3, the strength is not expressed, and when it exceeds 3.0, the amount of the solvent is small, so that the amount of the solvent between the plastic chains is small. This is because there is little dispersion of the solvent and the softening temperature of the waste plastic is unlikely to be lowered, so that when used as a binder, the dispersibility in the molded product is lowered, and the strength of the molded product may be lowered.

  In addition, the softening point and viscosity of the solvent in which the waste plastic is mixed and / or dissolved is preferably equal to or lower than the temperature or viscosity that can be transferred by a pump or the like. Specifically, the viscosity is preferably transferable at the temperature of the steam heating pipe. The apparatus used in the mixing / dissolution step 6 preferably has a mechanism capable of stirring while heating the solvent. In addition, in order to achieve uniform dissolution and shorten the processing time, it is important that stirring from the liquid surface to the inside is possible. In particular, since the viscosity of the solvent increases as the plastic dissolves, it is desirable that the stirring blades be capable of exhibiting sufficient stirring ability in a high viscosity fluid, such as a helical ribbon type or an anchor type. At this time, a powerful stirring device that enables continuous stirring of the high-viscosity fluid is required. In addition, mixing and stirring using a homogenizer capable of high-speed shearing with respect to the dissolved material is also effective.

  The waste plastic and solvent mixture (mixed binder) produced in the mixing / dissolving step 6 is supplied to the coal mixing step 7 and uniformly mixed with the coal and a solid binder (solid binder) at room temperature. The mixing ratio of the mixed binder is preferably 1% by mass or more and 20% by mass or less with respect to the coal for forming coal raw material when the binder is added alone. When the added amount of the binder is less than 1 mass%, almost no strength is exhibited. When the added amount exceeds 20 mass%, a space is formed due to volatilization of the binder component when the dry distillation is performed, and the density is lowered. This is because it may end up. However, when a solid binder is added, it depends on the addition ratio, and is adjusted accordingly.

  The mixing temperature depends on the softening point of the solid binder to be added, but in order to heat a large amount of material at a low cost, it is particularly suitable to use steam in the steelworks, and it is usually within the temperature range that can be heated with steam. It is preferable to set it (about 120 degrees C or less). However, when a mixed binder having a large amount of waste plastic and a high softening point is used, it is possible to perform mixing and dissolution at a higher temperature using, for example, a heating method using a heat medium such as silicone oil.

  As for the mixing method, it is only necessary to be able to mix uniformly, and a screw system or a mixing device equipped with a stirrer may be used as appropriate, but when using a mixing stirrer using a stirring blade, In order to ensure mixing and stirring performance, it is suitable to use a stirring device having a motor driving force capable of ensuring a stirring speed of 150 rpm or more.

The mixture obtained in the coal mixing step 7 is molded in the molding step 8 to produce coal. The mixture is pressurized using a molding machine or the like and molded into, for example, bean charcoal. As the molding machine, extrusion molding or double roll type molding machine can be used as appropriate. In addition, in consideration of handling strength after molding, it is desirable to be able to heat the molding machine itself or to have a heating and mixing mechanism before molding. The size of the molded charcoal, in the case of the coke raw material may be any comparable magnitude and normal coke after carbonization at coke oven, in particular it is a 18cm ³ ~75cm ³ preferable.

  The coking coal produced in the molding step 8 is mixed with coal, charged into the coke oven 9, and then dry-distilled to obtain blast furnace coke. The appropriate ratio of the added coal during charging to the coke oven varies depending on the briquette shape, coal particle size, and coke oven shape, but is preferably in the range of 1 to 40 mass% of the amount of coal normally charged. If less than 1 mass%, the effect of improving the coke strength and coke productivity hardly appears, and if it exceeds 40 mass%, the raw material charging density in the coke oven is excessively increased, so that coke clogging and damage to the coke oven furnace wall occur. This is because it may be a cause.

  Using the processing apparatus shown in FIG. 2, the charcoal was manufactured.

  Waste plastics used in the production of coal char were preliminarily removed for foreign matter and crushed to 20 mm or less, with ash content of 3.5 mass% and volatile content of 95.2 mass%, and chemical analysis values. C: 75.8 mass%, H: 10.3 mass%, O: 8.8 mass%, N: 0.2 mass%, S: 0.1 mass%.

  The tar fraction produced during coal dry distillation as a solvent was distilled in an atmospheric distillation column, and the fraction obtained from the middle stage was used. Specific gravity was 0.97 (15 ° C.), pour point: −32 ° C., 10% distillation temperature 160 ° C.

  Coal having a particle size of 3 mm or less was used, and as a solid binder added simultaneously with coal, asphalt pitch (ASP) having a softening point of 180 ° C. and a particle size of 3 mm or less having a particle size of 54% was used.

After mixing 1 kg of waste plastic with respect to 2 kg of solvent in the mixing / dissolving apparatus 11, a mixing / dissolving treatment for 20 minutes was performed while stirring at 200 ° C. 3 kg of the obtained waste plastic mixed solvent (mixed binder), 75 kg of coal, and 2.3 kg of solid binder were supplied to the coal mixing device 12 and heated with steam and stirred for 2 minutes with a stirrer and mixed. Furthermore, the obtained mixture was sent to a double roll molding machine 13 having a cup capacity of 50 ml to produce coal, and the yield was measured. A test was conducted in which the obtained coal was subjected to dry distillation at 1100 ° C. Crushing strength was measured for coal before carbonization and coal after carbonization. The drum strength of the coal after dry distillation was measured. (Invention Example 1)
Next, a charcoal was produced in the same manner as in the above-described example of the present invention except that the solvent did not contain waste plastic. However, the solvent was 3 kg. In the same manner as in Example 1, the yield of coal char, the crushing strength of coal before carbonization, the crushing strength of coal after carbonization, and the drum strength after carbonization were measured. (Comparative Example 1)
Further, the waste plastic was frozen and ground to the same particle size as the solid binder (particle size of 3 mm or less is about 54%). 1 kg of the obtained plastic, 2 kg of the solvent used in the examples of the present invention, 2.3 kg of solid binder, and 75 kg of coal were supplied to the coal mixing device 12 and heated by steam and mixed with a stirrer for 2 minutes. . Using the obtained mixture, coking coal was produced in the same manner as in the examples of the present invention, and the yield of the forming coal, crushing strength before dry distillation, crushing strength after dry distillation, and drum strength after dry distillation were measured. (Comparative Example 2)
The yield, drum strength, and crushing strength of the coals produced in Invention Example 1, Comparative Example 1 and Comparative Example 2 are shown in FIG. In FIG. 3, the strength and yield of Comparative Example 1 are shown as an index, with 100 as the index.

  The crushing strength was obtained by measuring the force at the time when cracking occurred (the rising pressure stagnated) by applying pressure from above and below to the pressing surface of the coal using a crushing strength tester. The unit is represented by N / P, and P indicates that the surface on which the measurement sample receives pressure is point contact. The drum strength is the rotational strength of coke specified by JIS K 2151. Here, 5 kg of charcoal on the sieve sieved with a sieve with an opening of 15.9 mm is charged into a drum tester and rotated at 50 rpm at 50 rpm. Then, it was sieved with a 15.9 mm mesh sieve to determine the mass on the sieve, and the percentage of the original mass was taken as the drum strength. As the drum tester, a trommel strength tester having three blades having a diameter of 500 mm, a thickness of 500 mm, and a height of 80 mm was used.

  Moreover, the yield of forming coal was made into the ratio of the forming charcoal with a particle size of 10 mm or more in the manufactured forming coal.

  The forming coal using the production method of the present invention is suitable as a raw material for coke, and the yield and strength are much improved compared to the forming coal using conventional waste plastic (Comparative Example 2). It has been found that the strength is improved even when compared with ordinary coal that does not use plastic as a raw material (Comparative Example 1). The coke produced by the present invention also has improved strength compared to coke using conventional waste plastic (Comparative Example 2), and compared to ordinary coke that does not use plastic as a raw material (Comparative Example 1). Also improved in strength.

  Using the processing apparatus shown in FIG. 2, the charcoal was produced under the following conditions.

  In the same manner as in Example 1, after crushing and removing foreign substances, waste plastic (20 mm or less) from which vinyl chloride and paper were removed by a specific gravity separator was used as a raw material. As the solvent, tar produced during coal carbonization was used. The specific gravity was 1.17 (15 ° C.), and the 10% distillation temperature was 230 ° C. 12 kg of the plastic and 15 kg of tar (waste plastic / solvent ratio = 0.8) were charged into a mixing / dissolving apparatus, and stirred and dissolved at 200 ° C. for 1 hour. Stirring was performed with an anchor stirring blade for high viscosity, and the rotation speed of the stirring blade was 150 rotations per minute. With respect to 27 kg of the obtained mixed binder, 600 kg of coal having the same particle size and properties as those used in Example 1 and 15 kg of solid binder (asphalt pitch) are supplied to the coal mixing device and mixed for 4 minutes while being heated by steam. Stir. Furthermore, the obtained mixture was sent to a double roll molding machine having a cup capacity of 47 mL to produce a charcoal (Invention Example 2).

  Next, 16 kg of granular plastic and 20 kg of tar (waste plastic / solvent ratio = 0.8), which are the same raw materials as in Invention Example 2, were charged into the mixing / dissolving apparatus and stirred under the same conditions as in Invention Example 2. In the same manner, 600 kg of coal and 15 kg of solid binder were added and supplied to the coal mixing apparatus, and the mixture was stirred and mixed for 4 minutes while heating with steam. The obtained molded product was briquetted with the double roll molding machine used in Invention Example 2 to produce a charcoal (Invention Example 3).

  Further, tar as a solvent was added in place of the mixed binder, and the mixture was stirred and molded under the same conditions as in Example 2 of the present invention to produce a charcoal. At this time, the amount of tar added was 27 kg, which was the same as the amount of the mixed binder added in Invention Example 2 (Comparative Example 3).

  For each of these coals, the molding yield was measured at the time of molding. Moreover, as a strength evaluation test of these coals, the trommel strength test and the crushing strength test shown in Example 1 were performed. The yield, drum strength, and crushing strength of the coals produced in Invention Example 2, Invention Example 3 and Comparative Example 3 are shown in FIG. In FIG. 4, the strength and yield of Comparative Example 3 are set as 100, and are shown as indexes.

  Furthermore, each coal was repeatedly manufactured in large quantities by the same method, and it disperse | distributed and compounded in raw coal (coal) in the chamber furnace type coke oven (7.55mx17mx0.45m). At this time, the blending ratio of the forming coal into the raw coal was adjusted so as to be 20 mass%.

After the carbonization, each coke was evaluated for drum strength (DI150 / 15 specified in JISK2151) and CSR (strength after CO ₂ reaction) and compared.

  The strength measurement results are shown in Table 1. The value of Comparative Example 2 in Example 1 was taken as 100, and the strength ratios in Invention Example 2, Invention Example 3 and Comparative Example 3 were shown as indices.

  Compared with Comparative Example 3 in which only the solid binder and the solvent were used, in Invention Example 2 in which the waste plastic mixed binder was used, the molding yield increased, the drum strength increased, and the crushing strength was greatly improved. Furthermore, these strengths were further greatly improved by increasing the amount of mixed binder added. Furthermore, in a comparative evaluation of coke strength obtained by blending 20 mass% of these coals into raw coal and dry distillation, it was confirmed that both the DI and CSR indicators were improved by using a waste plastic mixed binder.

The coke manufacturing flow which is one Embodiment of this invention. Schematic of the processing apparatus suitable for using for the manufacturing method of this invention. The graph which shows the intensity | strength and yield of the forming coal in this invention example 1 and Comparative Examples 1-2. Example 1 The graph which shows the intensity | strength of a charcoal in this invention example 2, this invention example 3, and the comparative example 3, and a yield. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste plastic collection process 2 Crushing (unpacking) process 3 Primary crushing process 4 Sorting process 5 Secondary crushing process 6 Mixing and melting process 7 Coal mixing process 8 Molding process 9 Coke oven 10 Blast furnace 11 Mixing and melting apparatus 12 Coal mixer 13 Double roll molding machine

Claims (7)

Waste plastic is mixed and / or dissolved in a petroleum tar and / or coal tar solvent at a temperature of 150 ° C. to 220 ° C. to form a mixed binder, and the mixing ratio of the solvent to the waste plastic in the mixed binder is mass. how the 0.3 to 3.0, to produce a molded charcoal, characterized in that press-molding engages coal and mixed in a mixed and dissolved state the mixture binder ratio.   2. The heavy oil obtained by recovering light oil after distillation of petroleum-based tar and / or coal-based tar and distillation of petroleum-based tar and / or coal-based tar, wherein said solvent is replaced with petroleum-based tar and / or coal-based tar. The manufacturing method of the charcoal as described in 2.   The method for producing a formed coal according to claim 1 or 2, wherein an addition ratio of the mixed binder to the coal is 1% or more and 20% or less by mass ratio.   The method for producing a coal char according to any one of claims 1 to 3, wherein the coal blend is produced by mixing the binder and the coal with a solid binder and press-molding the mixture. .   A method for producing coke, characterized in that the coal char produced by the method according to any one of claims 1 to 4 is charged into a coke oven and dry-distilled.   A method for producing coke, wherein the coal formed by the method according to any one of claims 1 to 4 is charged into a coke oven together with the coal and subjected to dry distillation.   The method for producing coke according to claim 5 or 6, wherein an addition ratio of the formed coal to the coal which is a coke raw material charged in the coke oven is 1% or more and 40% or less by mass ratio.

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