JP5636356B2 - Method for producing ashless coal molding - Google Patents

Description

  The present invention relates to a method for producing an ashless coal molded product that obtains a molded product using ashless coal obtained by extracting coal with a solvent.

  Although coal contains ash, in recent years, development of ashless coal (hyper coal) that actively removes ash in coal from the viewpoint of environmental measures has been actively promoted. Various techniques, such as a manufacturing method of ashless coal, are proposed by 1-3. Ashless coal was produced by extracting coal with a solvent, separating only the components soluble in the solvent, and then removing the solvent, as described in these patent publications 1 to 3. A type of modified coal.

  Structurally, this ashless coal has a wide molecular weight distribution from a relatively low molecular weight component having 2 to 3 condensed aromatic rings to a high molecular weight component having about 5 or 6 condensed aromatic rings. Further, since ash is not dissolved in a solvent, ashless coal is substantially free of ash, exhibits high fluidity under heating, and has excellent heat fluidity. Some coals exhibit thermoplasticity at around 400 ° C. like caking coal, but ashless coal generally melts at 200 to 300 ° C. regardless of the quality of the raw coal (softening meltability). There).

  From the viewpoint of making use of this characteristic of ashless coal, application development has been promoted in which ashless coal is used as a binder for coke production (coke binder). In recent years, ashless coal has been used as a carbon material. Attempts have been made to produce carbon materials by using them as raw materials. Techniques for producing various carbon materials and coke using this ashless coal have been proposed as, for example, Patent Document 4 and Patent Document 5.

  This ashless charcoal may be produced in powder or granular form. In such a case, the ashless charcoal is used as an ashless charcoal molded from the viewpoint of handling and convenience during storage or transportation. It is being considered. However, such ashless coal molded products may peel off or exfoliate when they are stored or transported, or when producing various carbon materials or coke. There is a problem that it is likely to occur. Of course, there is a problem in that dust is likely to be generated when it is used in powder form or granular form.

  On the other hand, if ashless coal is molded at a very high temperature or high pressure, it is possible to produce an ashless coal molded product having a strength that can solve the above-mentioned problems. Therefore, it is not a realistic manufacturing method, and it can be said that it is difficult to implement industrially.

JP 2001-26791 A Japanese Patent Laid-Open No. 2005-120185 JP 2008-115369 A JP 2009-120464 A JP 2009-215421 A

  The present invention has been made as a solution to the above-mentioned conventional problems, and can suppress the generation of dust, has excellent strength, can also suppress oxidation, and further, is an inexpensive and simple ashless coal molding. It is an object of the present invention to provide a method for producing an ashless coal molding that can be produced.

  The invention according to claim 1 is a mixture of coal and a solvent to extract a coal component soluble in the solvent, and then an extract containing the coal component soluble in the solvent and coal insoluble in the solvent. A reformed coal manufacturing process for separating the solvent from the extract and recovering the granular ashless coal, and forming the granular ashless coal into a lump. A step of obtaining an ashless coal molding, wherein the ashless coal and water are mixed to adjust the water concentration to 0.5 to 8.0% by mass. After producing a mixture, the mixture is molded to obtain an ashless coal molded product.

  The invention according to claim 2 is characterized in that the temperature of the mixture of the ashless coal and water during molding in the molding step is 30 to 120 ° C. It is a manufacturing method.

  According to the method for producing an ashless coal molded product of the present invention, it is possible to suppress the generation of dust during storage and transportation, and when producing various carbon materials and coke, and excellent in strength as a molded product, It is possible to obtain an ashless coal molded product that can also suppress the oxidation of ashless coal by an inexpensive and simple method without using a method of molding ashless coal at a very high temperature or high pressure. it can.

It is process drawing which shows typically a modified coal manufacturing process among the manufacturing methods of the ashless coal molding of this invention.

  Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.

  According to the method for producing an ashless coal molding of the present invention, by using powdered ashless coal obtained in the modified coal production process, the powdered ashless coal is molded into a lump in the molding process. Although an ash-coal molded product can be obtained, by-product coal is also produced as a by-product in the modified coal production process, and in this specification, a method for producing by-product coal will also be described. Note that ashless coal and by-product coal are both modified coal obtained by reforming coal.

  First, before explaining each step of the method for producing an ashless coal molded product of the present invention, based on a process chart schematically showing the modified coal production process shown in FIG. An example of the structure of the peat producing apparatus 1 will be briefly described.

  As shown in FIG. 1, the reformed coal manufacturing apparatus 1 includes a solvent supply tank 2 that supplies a solvent, a coal supply tank 3 that supplies coal, and supplies from the solvent supply tank 2 and the coal supply tank 3. After receiving the slurry and preparing the slurry, the extraction tank 4 for extracting the coal component (solvent soluble component) soluble in the solvent from the prepared slurry, the extract containing the coal component soluble in the solvent, and the coal component (residue not soluble in the solvent) ), A separation tank 5 that separates into solid concentrate, and an ashless coal collection tank 6 that recovers ashless coal by removing the solvent from the extract separated in the separation tank 5, and a separation tank 5. The by-product charcoal collection tank 7 which removes a solvent from the solid content concentrate and collects by-product charcoal is provided.

  The solvent removed from the extract in the ashless coal recovery tank 6 may be returned to the solvent supply tank 2 and reused. Similarly, the solvent is removed from the solid concentrate in the byproduct coal recovery tank 7. The solvent may be returned to the solvent supply tank 2 and reused. The ashless coal recovered in the ashless coal recovery tank 6 does not substantially contain ash because the ash is not dissolved in the solvent, and the water content is approximately 0.5% by mass or less, which is higher than the raw coal. Indicates the calorific value. This ashless charcoal can be used as a raw material for various carbon materials, as a binder (coke binder) for iron-making coke and forming charcoal. In the present invention, it is assumed that the ashless coal does not substantially contain ash. Of course, the ash content is preferably 0% by mass, but ash is inevitably contained because ashless coal is recovered through solvent extraction. Therefore, the ashless coal described in the present invention is allowed to contain a small amount of ash that is inevitably contained. The upper limit of the ash content allowed for ashless coal is 3.0 mass%, preferably 1.5 mass%, more preferably 1.0 mass%.

  On the other hand, the by-product coal recovered in the by-product coal recovery tank 7 contains ash that was not dissolved in the solvent. Although this by-product charcoal contains ash, it has no moisture and has a sufficient calorific value. Therefore, it can be used as a part of the coal blend of the coke raw material, and can be used for various fuels and the like without using the coke raw coal.

  Hereinafter, using the modified coal production apparatus 1 having the above-described configuration, ashless coal and by-product coal are produced in the modified coal production process, and the ashless coal obtained in the modified coal production process is formed in the molding process. An embodiment of the method for producing an ashless coal molded product of the present invention, in which an ashless coal molded product is produced by forming a block into a lump.

  In the modified coal manufacturing apparatus 1, the solvent supply tank 2 is a tank that stores a solvent and supplies the solvent to the extraction tank 4, and the coal supply tank 3 stores the coal and extracts the coal. 4 is a tank to be supplied to 4. Moreover, the extraction tank 4 is a tank which mixes a solvent and coal and extracts the coal component which melt | dissolves in a solvent, and the separation tank 5 is a tank which isolate | separates the mixture after extraction into an extract and solid content concentrate. is there. The ashless coal recovery tank 6 is a tank that separates the solvent from the extract and collects the ashless coal, and the byproduct coal recovery tank 7 separates the solvent from the solid content concentrate and recovers the byproduct coal. It is a tank. The method for producing an ashless coal molding according to the present invention includes a modified coal production process and a molding process. Hereinafter, each step will be described.

<Modified coal production process>
The modified coal production process is a process for producing and collecting ashless coal and by-product coal using the modified coal production apparatus 1. That is, the reformed coal production process includes an ashless coal recovery process and a by-product coal recovery process. Specifically, first, the coal supplied from the coal supply tank 3 and the solvent supplied from the solvent supply tank 2 are mixed in the extraction tank 4 to extract a coal component dissolved in the solvent from the coal. Then, it isolate | separates into an extract and solid content concentrate in the separation tank 5, and sends an extract to the ashless coal recovery tank 6 and a solid content concentrate to the byproduct charcoal recovery tank 7, respectively. In the extract sent to the ashless coal recovery tank 6, the solvent is separated in the tank and recovered as ashless coal. On the other hand, the solid content concentrate sent to the byproduct charcoal recovery tank 7 is separated as a byproduct charcoal after the solvent is separated in the tank. The extract is a solution containing a coal component extracted into a solvent, and the solid content concentrate is a concentrate containing a coal component (ash containing coal, that is, ash coal, residue) that is insoluble in the solvent. It is.

  A known method can be used as a method for obtaining modified coal (ashless coal and by-product coal), and the production conditions and the solvent type used are as raw materials for use such as the properties of carbon and carbon materials. It is appropriately selected in view of design. A typical method is to mix a coal with a solvent that has a high solvent power for coal, often an aromatic solvent (hydrogen donating or non-hydrogen donating solvent), and heat it in the coal. It is a method of extracting the organic component.

  However, in order to obtain the reformed coal with higher efficiency and lower cost, for example, the reformed coal can be produced by the method described below. In the method, first, in the extraction tank 4, a mixture (slurry) obtained by mixing the coal supplied from the coal supply tank 3 and the non-hydrogen donating solvent supplied from the solvent supply tank 2 is heated to produce non-hydrogen. Extract coal components that are soluble in the donating solvent. Next, in the separation tank 5, the extracted slurry is separated into an extract and a solid concentrate. One of the separated extracted liquids becomes ashless coal by separating the non-hydrogen-donating solvent in the ashless coal recovery tank 6, and the ashless coal is recovered. Moreover, the other solid content concentrated liquid becomes by-product coal by separating the non-hydrogen donating solvent in the by-product coal recovery tank 7, and the by-product coal is also recovered.

  Coal used as a raw material (hereinafter also referred to as raw material coal) is not particularly limited, and bituminous coal having a high extraction rate (ashless coal recovery rate) may be used, or cheaper inferior coal (subbituminous coal, lignite). May be used. In addition, it is preferable to pulverize coal into as small particles as possible before supply. Specifically, it is preferable that the particle diameter (maximum length) is 1 mm or less.

  The non-hydrogen donating solvent is a coal derivative which is a solvent mainly composed of a bicyclic aromatic and purified mainly from a coal carbonization product. This non-hydrogen-donating solvent is stable even in a heated state and has excellent affinity with coal. Therefore, the proportion of soluble components (herein, coal components) extracted into the solvent (hereinafter also referred to as extraction rate) In addition, it is a solvent that can be easily recovered by a method such as distillation. Main components of the non-hydrogen donating solvent include bicyclic aromatic naphthalene, methyl naphthalene, dimethyl naphthalene, trimethyl naphthalene and the like, and other non-hydrogen donating solvent components have aliphatic side chains. Naphthalenes, anthracenes, fluorenes, and these include biphenyl and alkylbenzenes having long aliphatic side chains.

  The extraction rate of coal can be increased by heat extraction using this non-hydrogen donating solvent. In addition, the non-hydrogen-donating solvent can be easily recovered unlike a polar solvent, and thus is easy to circulate. Furthermore, since it is not necessary to use expensive hydrogen, a catalyst, etc., coal can be solubilized at a low cost to obtain reformed coal, and economic efficiency can be improved.

  Although the coal density | concentration with respect to a solvent is based also on the kind of raw material coal, the range of 10-50 mass% is preferable on a dry coal basis, and the range of 20-35 mass% is more preferable. When the coal concentration with respect to the solvent is less than 10% by mass, the proportion of the coal component extracted into the solvent is less than the amount of the solvent, which is not economical. On the other hand, the higher the coal concentration, the better. However, when it exceeds 50% by mass, the viscosity of the prepared slurry becomes high, and it is difficult to move the slurry and separate the extract from the solid concentrate.

  The heating temperature of the slurry is preferably in the range of 300 to 450 ° C. By setting the heating temperature of the slurry within this range, the bonds between the molecules constituting the coal are loosened, mild thermal decomposition occurs, and the extraction rate becomes the highest. When heating temperature is less than 300 degreeC, it becomes easy to weaken the coupling | bonding between the molecules which comprise coal, and an extraction rate becomes difficult to improve. On the other hand, when the heating temperature exceeds 450 ° C., the pyrolysis reaction of coal becomes very active, and recombination of the generated pyrolysis radicals occurs, so that the extraction rate is difficult to improve and the coal is not easily altered. Become. A more preferable heating temperature is 300 to 400 ° C.

  The heating time (extraction time) is based on the time to reach dissolution equilibrium, but it is economically disadvantageous to realize it. The heating time varies depending on conditions such as the coal particle diameter and the type of solvent, and cannot be generally stated, but is usually about 10 to 60 minutes. If the heating time is less than 10 minutes, the extraction of the coal component tends to be insufficient, while if it exceeds 60 minutes, the extraction does not proceed any further, which is not economical.

  The extraction of the coal component dissolved in the non-hydrogen donating solvent is preferably performed in the presence of an inert gas. Contact with oxygen is dangerous because it may ignite, and using hydrogen is not preferable because it increases costs. As the inert gas to be used, inexpensive nitrogen is preferably used, but is not particularly limited. The pressure is preferably 1.0 to 2.0 MPa, although it depends on the temperature at the time of extraction and the vapor pressure of the solvent used. When the pressure is lower than the vapor pressure of the solvent, the solvent evaporates and is not trapped in the liquid phase and cannot be extracted. In order to confine the solvent in the liquid phase, a pressure higher than the vapor pressure of the solvent is required. On the other hand, if the pressure is too high, the cost of the equipment and the operating cost increase, which is not economical.

  In the above explanation, an example in which a non-hydrogen donating compound is used as a solvent mainly from the viewpoint of economy has been described. However, a hydrogen donating compound (including coal liquefied oil) typified by tetralin is used as a solvent. Of course, it is also good. When a hydrogen donating solvent is used, the yield of ashless coal is improved.

  In this way, the slurry after extracting the coal component is separated into an extract and a solid concentrate. As a method for separating a slurry into an extract and a solid concentrate, various filtration methods and centrifugal methods are generally known. However, the filtration method requires frequent replacement of the filter, and the centrifugation method tends to cause clogging with undissolved coal components, making it difficult to implement these methods industrially. Therefore, it is preferable to employ a gravity sedimentation method that allows continuous operation of fluid and is suitable for a large amount of processing at low cost. By adopting this method, from the upper part of the gravity sedimentation tank, an extract liquid (hereinafter also referred to as a supernatant liquid) containing a coal component extracted into the solvent is dissolved in the solvent from the lower part of the gravity sedimentation tank. A solid concentrate containing no coal component (residue) can be obtained. Although it is ideal that the extract and the solid concentrate are completely separated, coal components that are not soluble in the solvent are mixed in a part of the extract or the extract is part of the solid concentrate. Even if it is mixed, there is no problem if it is a small amount.

  Thereafter, ashless coal is obtained by separating a solvent such as a non-hydrogen donating solvent from the supernatant (extract). Moreover, by-product charcoal is obtained by isolate | separating a solvent from solid content concentrate. As a method for separating the solvent from the supernatant or solid concentrate, a general distillation method or evaporation method (spray drying method, etc.) can be used. From the supernatant, ashless substantially free of ash. Charcoal can be obtained, while by-product charcoal containing ash can be obtained from the solid concentrate. Either ashless charcoal or byproduct charcoal may be collected first or simultaneously. Thus, the ashless coal manufactured with the modified coal manufacturing apparatus 1 is used for the next forming step.

  In addition, the shape and particle size distribution of ashless coal obtained by recovering from the extract vary depending on the separation method. The reformed coal production process described here is mainly targeted for operation at temperatures below the softening temperature of ashless coal, such as general distillation methods (flash distillation, etc.) and evaporation methods (spray drying method, etc.). It is a method to do. Ashless coal obtained by these methods is a fine particle having a particle size (maximum length) of 1 mm or less, and the moisture content of ashless coal is 0 to 0.5 mass%.

<Molding process>
The molding step is a step in which powdered ashless coal is molded into a lump to form an ashless coal molding. In addition, an ashless-coal molded product is a molded object with the predetermined | prescribed three-dimensional structure obtained by shape | molding granular ashless coal in the lump shape. The ashless charcoal can be formed by a known method except that the moisture concentration described below is specified. For example, an ashless coal molding can be molded using a molding machine such as compression molding or two-roll tablet molding. Moreover, if it grind | pulverizes and it carries out high-pressure press, a molded object can be obtained comparatively easily. One of the gist of the present invention is to use liquid water as a main binder. The present inventors have found that water has a binder effect to connect ashless coals, and have completed the present invention. Moreover, since the heat of ashless coal is taken when water evaporates, it also has a stabilizing effect to prevent ignition (latent heat effect).

  However, it does not prevent the use of other known binder compounds as described below. For example, known compounds such as tar, pitch, molasses, and resin can be used as the binder compound. The ratio of the binder compound in the molded body is preferably less than 20% by mass. Further, an appropriate filler such as carbon fiber or a light component by-produced in the modified coal production process may be added and mixed. The ashless coal molded product is a molded product mainly composed of ashless coal such that ashless coal occupies 80% or more of the ashless coal molded product.

  Next, an example of the process until the granular ashless coal recovered in the modified coal manufacturing process is formed will be described. First, the recovered granular ashless coal is put into a hopper. Since the ashless coal has a solvent removed by a distillation method, an evaporation method, or the like, for example, the temperature is about 150 ° C. and the moisture content is in a dry state of about 0 to 0.5 mass%. Next, ashless coal in the hopper is put into a mixer, water is sprayed onto the ashless coal to cool it to a predetermined temperature, and the moisture and humidity are adjusted to optimize the mixture of ashless coal and water. Adjust to the correct moisture concentration and molding temperature. In addition, since the particle | grains of ashless coal are grind | pulverized by stirring with this mixer, a particle size adjustment can also be performed. Then, the mixture adjusted to the optimum moisture concentration and molding temperature is put into a molding machine to form a molded body. In this way, ashless coal is processed into an ashless coal molding.

  In the molding step, ashless coal and water are mixed to obtain a mixture of ashless coal and water whose water concentration is adjusted to 0.5 to 8.0% by mass, and the mixture is molded to make ashless. A charcoal molding is obtained. Specifically, before molding with a molding machine, ashless coal and water are mixed, and the water concentration is adjusted to 0.5 to 8.0 mass%, and then ashless coal with water is molded with a molding machine. To do. About the kind of water to mix, it is not necessary to prescribe | regulate in particular, You may use water generally used, such as a tap water. The water concentration is the ratio of the mass of water to the total mass of ashless coal and water, and when adding the binder compound, filler, light components, etc. described above to ashless coal, The ratio of the mass of water to the total mass including

  When the moisture concentration is less than 0.5% by mass, the interparticle adhesion is not sufficient, so that dust is easily generated from the ashless coal molded product, and the strength of the ashless coal molded product becomes insufficient. On the other hand, if it exceeds 8.0% by mass, excessive water forms a water film between the particles and inhibits adhesion, so that dust is easily generated from the ashless coal molded product. Therefore, the water concentration is set to 0.5 to 8.0% by mass. Preferably, it is 1.0-7.0 mass%. In addition, when it shape | molds so that a water concentration may be 0.5-8.0 mass% at the time of shaping | molding, the water content of the ashless coal molding which is the result is also about 0.5- It becomes 8.0 mass%.

  The mixing method of ashless coal and water is not particularly limited. As described above, for example, ashless coal is placed in a mixer and sprayed with water or the like so as to obtain a predetermined moisture concentration. The amount may be adjusted by adding water and stirring. The ashless coal is preferably pulverized into as small particles as possible, and the particle size (maximum length) is preferably 1 mm or less (the secondary particle size is pulverized to 1 mm or less). Moreover, as above-mentioned, the water | moisture content adjustment of ashless coal can be performed uniformly by performing the mixing of the water to ashless coal, and the grinding | pulverization of ashless coal simultaneously with a mixer etc.

  Although the temperature of the mixture of ashless coal and water at the time of shaping | molding with a shaping | molding machine is not specifically limited, It is preferable that it is 30-120 degreeC. If the temperature of the mixture of ashless coal and water is 30 ° C. or higher, the strength of the molded body is improved and molding becomes easy. Moreover, if it is 120 degrees C or less, Preferably it is less than 100 degreeC, it will become easy to adjust water | moisture content and handling will become easy. More preferably, it is 50-90 degreeC. If necessary, the temperature may be kept using, for example, a heater or steam before being charged into the molding machine.

  The ashless coal molding thus produced should be used as a raw material for various carbon materials, iron-making coke, and a binder for coking coal (coke binder), etc., in the same manner as the ashless coal described above. Can do.

  As described above, the method for producing an ashless coal molded product of the present invention includes a modified coal production process and a molding process. However, in carrying out the present invention, within a range that does not adversely affect the respective steps, for example, a coal pulverization step for pulverizing raw coal, or a removal step for removing unnecessary substances such as dust, before or after each step. Alternatively, other steps such as an ashless coal drying step for drying the ashless coal may be included.

  Moreover, the manufacturing method of the modified coal in the above-mentioned modified coal manufacturing process is an example for manufacturing (recovering) ashless coal and by-product coal, and is not limited to this method. That is, as long as ashless coal that can be used in the present invention can be manufactured, other methods may be used, and each condition in the modified coal manufacturing process may be other conditions. Absent.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, and the present invention is implemented with appropriate modifications within a range that can meet the gist of the present invention. All of which are within the scope of the present invention.

<Manufacture of ashless coal>
First, ashless coal was produced by the following method. Australian bituminous coal was used as raw material coal, and 4 times the amount (20 kg) of solvent (1-methylnaphthalene (manufactured by Nippon Steel Chemical Co., Ltd.)) was mixed with 5 kg of this raw material coal to prepare a slurry. This slurry was pressurized with 1.2 MPa of nitrogen and extracted in a batch autoclave with an internal volume of 30 L under the conditions of 370 ° C. and 1 hour. This slurry was separated into a supernatant (extract) and a solid concentrate in a gravity sedimentation tank maintained at the same temperature and pressure.

  Two liters of the supernatant liquid containing 200 g of ashless coal was added to 20 liters of ethanol and stirred to precipitate ashless coal powder. The ashless charcoal powder was further washed with fresh ethanol and then dried by heat treatment in nitrogen at 100 ° C. for 1 hour to collect ashless charcoal. The recovered ashless coal had a water concentration of 0.1% by mass, an ash concentration of 0.5% by mass or less, and an average particle size of 0.05 mm.

  In this example, the solvent precipitation method described above was used to produce fine ashless coal powder having an average particle size of about 0.05 mm on the scale of experimental equipment. Then, the spray dry method is used.

<Molding process>
A predetermined amount of water was added to the collected ashless coal so as to have the moisture concentration shown in Table 1, and the mixture was mixed with a V mixer for 10 minutes to adjust the moisture. The moisture was measured according to coal JIS (JISM8812). However, air-drying was not performed, and measurements were made including attached water (meaning water that evaporated by air-drying).

Next, this mixture was placed in a mold and heated while applying pressure to form a tablet (an ashless coal molding). The conditions for molding are as follows.
Temperature: 40-120 ° C. (shown in Table 1)
Pressure: 1 ton / cm ²
Mold: 20mm in diameter
Filling amount: 6g

  Using the tablets having different moisture concentrations and different temperatures at the time of molding, a crush test was performed as an index of strength, and an ablation test was performed as an index of suppression of dust generation.

<Crush test>
The crushing test was performed by applying a compressive load in a direction perpendicular to the central axis of the cylindrical tablet and measuring the load leading to the fracture. In this crushing test, a crushing load of 30 kgf or more (however, 1 kgf = about 9.8 N) was accepted as being excellent in strength.

<Abrasion test>
In the abrasion test, first, 20 tablets were placed in a cylindrical container having a diameter of 250 mm and rotated at 30 RPM for 10 minutes. Thereafter, the tablet was sieved with a sieve having an opening of 5.66 mm, and the powder dropped under the sieve was weighed. In this brazing test, a powder having a mass of 11% by mass or less with respect to the mass of the entire tab red was regarded as being acceptable because dust generation can be sufficiently suppressed.

  The test results are shown in Table 1. In Table 1, those not satisfying the scope of the present invention and those not satisfying the evaluation criteria are underlined.

  No. 3 to 7 and 10 to 12 are invention examples satisfying the requirements of the present invention. Therefore, the acceptance criteria that the crushing load by the crushing test is 30 kgf or more and the powder falling under the sieve by the abrasion test is 11% by mass or less. I was satisfied. No. No. 12 satisfies the requirements of the present invention, but the temperature at the time of molding was as low as 40 ° C., so the crushing load is the lower limit of the acceptance criterion, 30 kgf, and the powder falling under the sieve is also the upper limit of the acceptance criterion The result was close to 10.9% by mass.

  On the other hand, no. Nos. 1 and 2 are comparative examples in which the water concentration is less than 0.5% by mass, 8 and 9 are comparative examples in which the water concentration exceeds 8% by mass. Therefore, the result was that at least one of the acceptance criteria was not satisfied among the acceptance criteria that the crushing load by the crushing test was 30 kgf or more and the powder dropped under the sieve by the abrasion test was 11% by mass or less.

DESCRIPTION OF SYMBOLS 1 ... Modified coal manufacturing apparatus 2 ... Solvent supply tank 3 ... Coal supply tank 4 ... Extraction tank 5 ... Separation tank 6 ... Ashless coal recovery tank 7 ... By-product coal recovery tank

Claims (2)

After mixing coal and a solvent to extract a coal component soluble in the solvent, an extract containing a coal component soluble in the solvent, and a solid concentrate containing a coal component insoluble in the solvent, A modified coal production process for separating the solvent from the extract and recovering powdered ashless coal;
Including a molding step of obtaining the ashless charcoal molding by molding the granular ashless charcoal into a lump,
In the molding step, the ashless coal and water are mixed to obtain a mixture of ashless coal and water whose water concentration is adjusted to 0.5 to 8.0% by mass, and then the mixture is molded and ashless. A method for producing an ashless charcoal molding characterized by obtaining a charcoal molding.   The temperature of the mixture of the ashless coal and water at the time of shaping | molding in the said shaping | molding process is 30-120 degreeC, The manufacturing method of the ashless coal molding of Claim 1 characterized by the above-mentioned.