JP2018035328A - Manufacturing method of briquette and manufacturing method of calcium carbide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of coke briquette suitable for carbide manufacturing.SOLUTION: A manufacturing method of a briquette includes a process for selecting first coke blocks with reference size or more from a first coke raw material with sulfur content of 3 mass% or less, a process for mixing at least one or more binder selected from a group consisting of a tar binder, a pitch binder and an asphalt-based binder, a second coke raw material by removing the first coke blocks from the first coke raw material and water in an adjusted temperature condition, and a process for supplying a mixed material containing at least one or more binder, the second coke raw material and the water to each recess which is arranged with facing in each rotation process of a pair of rolls arranged in each recess for molding and molding the same to a briquette with reference size or more.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a method for producing briquettes and a method for producing calcium carbide.

  Patent Document 1 describes a calcium carbide used for the production of acetylene (hereinafter simply referred to as carbide).

International Publication No. 2013/027426

  In order to manufacture carbide, quick lime and coke are supplied to an electric furnace, and a carbide generation reaction is accelerated through heating in the electric furnace. In order to ensure the reaction rate of the carbide generation reaction in the electric furnace and sufficient exhaust of the by-product gas, it is desirable that the coke supplied into the electric furnace has an appropriate size.

  In some cases, the size of wet coke coke that can be used as a raw material is 8 to 50 mm, and coke powder having a size of less than 8 mm is difficult to use as a raw material. Since coke powder having a size of less than 8 mm is used as a raw material for carbide, it is considered to form a briquette having a size equivalent to a lump coke that can be used as a raw material from coke powder having a size of less than 8 mm. However, if the molded briquette does not have sufficient strength, the briquette is cracked during the conveying process and / or the drying process, and the briquette is collapsed and powdered when charged into the furnace, and cannot be used as a raw material for carbide.

  As a result of intensive investigation of briquettes that can be used for carbide production, the inventors of the present application have found that coke briquettes suitable for carbide production are adjusted by adjusting the coke particle size, moisture, binder type and amount, and mixing conditions and molding conditions. It was newly found that it can be manufactured.

The method for producing a briquette according to one aspect of the present invention includes a step of selecting a first coke lump having a reference size or more from a first coke raw material having a sulfur content of 3% by mass or less,
At least one binder selected from the group consisting of a tar binder, a pitch binder, and an asphalt binder, a second coke raw material obtained by removing the first coke lump from the first coke raw material, and water are prepared. Mixing at a controlled temperature condition;
Supplying at least the one or more binders, the second coke raw material, and the mixed material containing water to the recesses arranged to face each other in the rotation process of a pair of rolls each provided with a molding recess. And forming a briquette of the reference size or larger.

  In some embodiments, the method for producing briquette is less than the reference size included in the second coke feed, prior to the step of mixing at least the one or more binders, the second coke feed, and the water. The method further includes a step of pulverizing the second coke mass.

  In some embodiments, the average particle size of the second coke raw material after pulverization is 50 μm to 1000 μm.

  In some embodiments, the above-described manufacturing method further includes a step of drying the second coke raw material before the step of pulverizing the second coke mass.

In some embodiments, the method described above includes supplying the briquette to a vibrating sieve to remove excess powder that adheres to or collapses from the briquette;
The method further includes the step of adding the removed excess powder to the second coke raw material before the step of mixing at least the one or more binders, the second coke raw material, and the water.

  In some embodiments, the step of mixing at least the one or more binders, the second coke raw material, and the water is performed under a temperature condition adjusted to 70 to 95 ° C.

  In some embodiments, when the depth of the recess is D and the length in the roll circumferential direction is L, D / L <0.3 is satisfied.

  In some embodiments, the reference size is less than 10 mm.

  In some embodiments, the mixed material includes at least 1 to 10 selected from the group consisting of (i) 2 to 10% by weight water, (ii) a tar binder, a pitch binder, and an asphalt binder. A binder of mass%, and (iii) 80 to 97 mass% of the second coke raw material are included.

  In some embodiments, the one or more binders include propane asphalt.

  In some embodiments, the one or more binders have a viscosity of 500 mPa · s or less.

  In some embodiments, the briquette is kept in a temperature range of 10-35 ° C.

  In some embodiments, the maximum size of the briquette is not more than 5 times the reference size.

According to another aspect of the present disclosure, there is provided a method for producing calcium carbide, wherein a briquette produced by any one of the above-described briquette production methods is added to the first coke mass or as an alternative carbon source for the first coke mass, Mixing with,
A step of heating the briquette and the quicklime to 2000 ° C. or higher with a zetaberg electrode in an electric furnace.

  According to one embodiment of the present invention, a coke blob and powder that are less than an appropriate size can also be used as a raw material for carbide production.

It is the schematic which shows the manufacturing method and manufacturing apparatus of a briquette which concern on embodiment of this invention. It is the photograph of the coke referred by embodiment of this invention, (a) shows the 1st coke lump beyond a standard size, (b) is the 2nd coke from which the 1st coke lump was removed from the 1st coke raw material. Indicates raw material, including coke blob and flour. 1 is a schematic view of an exemplary mixer for manufacturing briquettes according to an embodiment of the present invention. 1 is a schematic view of an exemplary molding machine for manufacturing briquettes according to an embodiment of the present invention. It is the schematic which shows a group of recessed part formed in the molding surface of the example molding machine for manufacture of the briquette which concerns on embodiment of this invention. It is the schematic which shows the manufacturing method and manufacturing apparatus of carbide which concern on embodiment of this invention. 1 is a schematic view of an exemplary electric furnace for manufacturing carbide according to an embodiment of the present invention. It is the schematic which shows the manufacturing method and manufacturing apparatus of another briquette which concern on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. One or more embodiments or features included in the following description are not individually independent and can be appropriately combined by those skilled in the art without undue description. Can also be grasped. In principle, duplicate descriptions between the embodiments or features are omitted. The description will be made with reference to the drawings, which are consistently the same in different drawings, but the references to the drawings are only for the purpose of promoting understanding and should be used to limit the claims. is not.

The method for producing briquettes according to an exemplary embodiment includes a step of selecting a first coke lump having a sulfur content of 3% by mass or less from a first coke raw material having a reference size or more,
At least one binder selected from the group consisting of a tar binder, a pitch binder, and an asphalt binder, a second coke raw material obtained by removing the first coke lump from the first coke raw material, and water are prepared. Mixing at a controlled temperature condition;
Supplying at least the one or more binders, the second coke raw material, and the mixed material containing water to the recesses arranged to face each other in the rotation process of a pair of rolls each provided with a molding recess. And forming a briquette of the reference size or larger.

  In the present exemplary embodiment, coke lumps and powders less than the reference size are formed into briquettes larger than the reference size. Although this briquette is remarkably different in that it contains a binder and water, it can be used for the carbide formation reaction in the same manner as the first coke block having a size larger than the reference size. Therefore, in some cases, a desired reaction rate of carbide generation in a carbide generating furnace, for example, an electric furnace, can be ensured, and a sufficient exhaust path for by-product gas generated with the carbide generation can be ensured.

  If the coke mass supplied into the carbide generating furnace is too large, the reaction rate of carbide generation may be slow. In some embodiments, if the coke mass supplied into the carbide generating furnace is too large, the energy required for the carbide generating reaction, for example, electric power may increase. If the coke mass supplied into the carbide generating furnace is too small, it is not easy to secure an exhaust passage for by-product gas, and the carbide reaction may be suppressed. When the above-mentioned second coke raw material is directly supplied into a carbide generating furnace, it is not easy to secure an exhaust path for by-product gas, and the carbide reaction may be suppressed.

  Various machines, methods, and conditions can be used for the above-described selection, mixing, and molding processes, and various conditions of each process can be appropriately adjusted. In this regard, those skilled in the art will appreciate that the specific examples and conditions of the present disclosure do not provide a basis for any limitation. For example, a vibration type or non-vibration type sieve (mesh) can be used for the sorting step without limitation. For the mixing step, a mixer in which a stirring blade (impeller) can rotate in the mixing tank can be used. For the molding step, a molding die capable of continuous molding including the above-described pair of rolls can be used.

  The mixed material is supplied to each of the concave portions that are arranged to face each other in the turning process of the pair of rolls provided with the concave portions for forming the mixed material. This forming apparatus is sometimes called a roll-type compression granulator. In some embodiments, the molding apparatus pressurizes the mixed material during molding of the mixed material, which contributes to achieving the target crush strength of the briquette.

  In some embodiments, before the step of mixing at least one binder, the second coke raw material, and water, the method further includes the step of pulverizing the second coke mass that is less than the reference size included in the second coke raw material. .

  Although not necessarily limited to this, it is assumed that the second coke raw material includes second coke lumps having various sizes less than the reference size and coke powder that is not distinguished from the lumps. In other words, the particle size distribution of the coke lump and the powder contained in the second coke raw material is wide. If the briquette to be finally formed contains a coke lump that is smaller than the standard size but is relatively large compared to other coke lump, it will be the starting point for crack formation in the briquette and coke powder There is a risk of causing this. If a crack occurs in the briquette, the crushing strength of the briquette is lowered, and there is a possibility that the small coke lump and the powder are more easily released from the briquette. Such a point can be solved or suppressed by pulverizing the second coke block having a size smaller than the reference size.

  As will be apparent from the following description, the third coke raw material may be pulverized in addition to the second coke raw material. The third coke raw material is a coke raw material containing a briquette-derived binder as defined hereinafter.

  In some embodiments, the average particle size of the second coke raw material after pulverization is 50 to 1000 μm. In some embodiments, the average particle size of the raw material after pulverization is 100 to 600 μm, and a higher crushing strength (JIS Z8841) of the briquette can be ensured. For example, a crushing strength of 30 kg / p to 60 kg / p or a crushing strength exceeding 60 kg / p is ensured.

  In some embodiments, the average particle size of the raw material after grinding is greater than 1000 μm and the crushing strength of the briquette is less than 30 kg / p. The reduction in briquette crushing strength may result in partial collapse of the briquette during the conveying process and supply coke powder into the electric furnace for carbide production. By-product gas is prevented from being discharged by the coke powder in the electric furnace, and the power required for the carbide reaction can be increased. Moreover, when the 2nd coke lump contained in the 2nd coke raw material is excessively pulverized, the specific surface area of the 2nd coke lump increases, and a larger amount of binder may be required to secure the desired strength of the briquette. There is. When a binder containing a sulfur content is used, there is a concern that the quality of the carbide is deteriorated. In some embodiments, in view of such a point, the average particle size of the second coke raw material after pulverization is included in the above range. In addition, when grind | pulverizing a 3rd coke raw material in addition to a 2nd coke raw material, the average particle size of a 2nd and 3rd coke raw material is contained in the above-mentioned range.

  As a method for obtaining the average particle size, a general-purpose particle size measuring device can be used. However, in claim interpretation, a brand name sieve shaker manufactured by Terraoka Co., Ltd., model number S-1, and a particle size measuring device manufactured in 2014 is used. In this case, an average particle size measurement is performed on a 400 g second coke raw material sample, an average value of the measured values is calculated, and the calculated average value is referred to.

  In some embodiments, the method further includes a step of drying the second coke raw material before the step of pulverizing the second coke mass. By maintaining the moisture content of the second coke raw material within a predetermined range before pulverization, not only the promotion of coke pulverization but also the moisture content of the briquette of the mixed material or the mixed material molded product during or after mixing It can also contribute to optimization. In general, water in coke acts to agglomerate or bond cokes. Therefore, regarding the acceleration of pulverization, a large amount of water contained in the coke is a problem, which may result in clogging in the pulverizer. The moisture content in the briquette is also an important index for achieving the target crushing strength of the briquette.

In some embodiments, supplying the briquette to a vibrating sieve to remove excess powder that adheres to or collapses from the briquette;
The method further includes adding the removed excess powder to the second coke raw material before the step of mixing at least one binder, the second coke raw material, and water. In this embodiment, a fine lump or powder derived from briquette can be reused after forming the briquette, and the raw material utilization efficiency of both coke and binder is increased.

  The binder includes one or more binders selected from the group consisting of tar binders, pitch binders, and asphalt binders, and the step of mixing the second coke raw material and the binder is performed under adjusted temperature conditions. The viscosity of the tar binder, the pitch binder, and the asphalt binder varies depending on the temperature. Therefore, it is desirable to secure an appropriate viscosity of the binder and promote sufficient mixing of the second coke raw material and the binder. By sufficiently mixing the second coke raw material and the binder, a briquette having a higher crushing strength can be produced.

  In some embodiments, the mixing temperature of at least one or more binder, second coke feedstock, and water is in the range of 70-95 ° C, more preferably 80-90 ° C. Thereby, sufficient dispersion | distribution of the binder in a 2nd coke raw material is ensured. In some embodiments, an asphalt binder is used and adjusted to a viscosity of 500 mPa · s or less in the mixer. In some cases, propane asphalt is used as a binder. Even when a binder other than the asphalt binder is used, the viscosity can be adjusted to 500 mPa · s or less.

  In some embodiments, 1-10 parts by weight of binder is added to 100 parts by weight of the second coke feed. In some embodiments, 7-9 parts by weight of binder is added to 100 parts by weight of the second coke feed. Thus, in some embodiments, the amount of binder added to the second coke raw material is appropriately set from the viewpoint of securing the desired briquette crush strength and carbide quality. When the binder content in the briquette is large, components contained in the binder (not necessarily limited to, for example, sulfur) may adversely affect the carbide quality. In some embodiments, the inclusion of excess binder in the briquette is undesirable.

  In some embodiments, the method further includes supplying a regulated amount of water in the process of mixing the second coke feedstock and the binder. Adequate mixing can be promoted by appropriately adjusting the amount of water in the mixed material. Proper adjustment of the amount of moisture in the mixed material also contributes to achieving the desired briquette crushing strength. In some embodiments, the moisture supplied during mixing of the second coke raw material and the binder so that the moisture content of the briquette after the molding step is 2 to 9% by mass, more preferably 4 to 7% by mass. The amount is adjusted.

  In some embodiments, when the depth of the concave portion of the roll is D and the length in the circumferential direction of the roll is L, D / L <0.3 is satisfied. By manufacturing briquettes with recesses that satisfy such a relationship, sufficient release properties of briquettes from the recesses of the roll can be ensured.

  In some embodiments, the briquette reference size is less than 10 mm, and in certain embodiments, the reference size is 8 mm.

  In some embodiments, the mixed material includes at least 1 to 10 weights selected from the group consisting of (i) 2 to 10 weight percent water, (ii) a tar binder, a pitch binder, and an asphalt binder. % Binder, and (iii) 80-97% by weight of the second coke feedstock. In a specific embodiment, it is preferable to use a mixed material having such a component ratio.

  In some embodiments, the maximum briquette size is no more than 5 times the reference size. An excessively large briquette size is accompanied by an increase in briquette mass and weight. If the impact that the briquette can receive during the briquette transport or storage or supply process becomes strong, it may lead to partial collapse of the briquette and result in the formation of coke powder. In some embodiments, appropriately sized briquettes are manufactured to avoid this point.

  In some embodiments, the briquettes are stored or transported at an ambient temperature between 10 ° C and 35 ° C. If the atmospheric temperature is lower than 10 ° C., the strength of the briquettes tends to be reduced, and the briquettes may be damaged when transported to an electric furnace or stored in a tank. When the atmospheric temperature exceeds 35 ° C., the briquettes are softened, and the briquettes on the tank bottom side may be crushed due to the weight of other briquettes during storage in the tank.

  A method for manufacturing calcium carbide according to some embodiments includes adding a briquette manufactured by the method for manufacturing a briquette according to any of the above-described embodiments to the first coke mass, or replacing the first coke mass. Calcium carbide is produced using as a carbon source.

  Specifically, the method for producing calcium carbide includes the step of mixing briquettes produced by the above-described briquette production method with quick lime as an additional carbon source to the first coke mass or as an alternative carbon source for the first coke mass; A step of heating the briquette and the quicklime to 2000 ° C. or higher with a zetaberg electrode in an electric furnace. Zetaberg electrodes are also called self-baking electrodes.

  The briquette manufactured by the method for manufacturing a briquette according to any of the above-described embodiments is also fully disclosed in the present application. In some embodiments, the briquettes are stored within a temperature range of 10-35 ° C and the temperature is maintained at 10-35 ° C. When the briquette temperature, for example, the surface temperature is less than 10 ° C., the briquette strength may be lowered. When the temperature of the briquette, for example, the surface temperature exceeds 35 ° C., the briquette itself is softened, and the briquette may be deformed during transportation, storage and the like.

  Those skilled in the art will appreciate that various methods can be taken and various types of devices can be utilized to implement the various embodiments and features described above. Accordingly, the more specific disclosure described below does not serve as a basis for any limitation on the claimed invention.

  One or more further exemplary embodiments will be described with reference to FIGS. FIG. 1 is a schematic view showing a briquette manufacturing method and manufacturing apparatus. FIG. 2 is a photograph of coke, (a) shows a first coke lump having a reference size or larger, (b) shows a second coke raw material obtained by removing the first coke lump from the first coke raw material, and coke. Contains a lump and flour. FIG. 3 is a schematic diagram of an exemplary mixer for making briquettes. FIG. 4 is a schematic diagram of an exemplary molding machine for the production of briquettes. FIG. 5 is a schematic diagram showing a group of recesses formed in the molding surface of an exemplary molding machine for the manufacture of briquettes. FIG. 6 is a schematic view showing a manufacturing method and manufacturing apparatus for carbide. FIG. 7 is a schematic diagram of an exemplary electric furnace for the manufacture of carbide. FIG. 8 is a schematic view showing another briquette manufacturing method and manufacturing apparatus.

  As shown in FIG. 1, the briquette manufacturing apparatus includes a first coke raw material feeder 10, a first coke lump sorter 20, a dryer 30, a second coke raw material storage unit 40, measuring devices 50 and 60, a pulverizer 70, A water supply source 80, a valve 90, a binder storage unit 100, a meter 110, a mixer 120, a molding machine 130, a vibrating sieve 140, and a briquette storage unit 150 are included. The arrows in FIG. 1 indicate the flow of coke feed, water, binder, or briquette.

  The 1st coke raw material supply machine 10 is an apparatus for supplying the 1st coke raw material. In some embodiments, the first coke raw material supply machine 10 is a simple tank and can discharge the first coke raw material from an outlet at the bottom of the tank that can be opened or closed automatically or manually. In other embodiment, the 1st coke raw material supply machine 10 is an apparatus which can convey the 1st coke raw material by air, a conveyor which can convey the 1st coke raw material, or apparatuses other than these.

  The 1st coke raw material contains the 1st coke lump more than a standard size. In the present exemplary embodiment, the first coke raw material contains, in addition to the first coke mass, a second coke mass less than the reference size. In some embodiments, in addition to the first and second coke masses, coke flour is included. In some embodiments, the coke flour has a broad particle size distribution in the range below the reference size.

  In a non-limiting exemplary form, the reference size is about 10 mm or less, or about 8 mm. The reference size is affected by the sorting accuracy of the first coke block sorter. Accordingly, it is understood that the reference size 8 mm has a certain width, for example, a width of about 1 mm. For example, a reference size of 8 mm should be understood as having a width in the range of 7.5 to 8.5 mm. A reference size of 7 mm should be understood as having a width of 6.5-7.5 mm. These points are also effective in claim interpretation. A range of 1 mm is illustrated with the reference size as the center, but this specific value can vary depending on the sorting accuracy.

  The first coke block sorter 20 sorts first coke blocks having a reference size of 8 mm or more. In one example, a first coke mass having a size of 8 to 50 mm is selected. The first coke lump sorting machine 20 according to an example includes a vibrating or non-vibrating sieve, the first coke lump remains on the sieve, and the first coke lump is removed from the first coke raw material. Passes through the sieve. In some embodiments, the first coke block sorter 20 includes a tank that temporarily stores the second coke feedstock.

  In the exemplary embodiment, the mesh opening of the sieve included in the first coke mass sorter 20 is about 8 mm. The wire diameter of the sieve is 2 mm. Moreover, the aperture ratio of the sieve is 80%. As will be appreciated by those skilled in the art, the degree of sieve opening may vary for different or identical sieves (ie, sieves are subject to manufacturing tolerances). The variation in the degree of opening of the sieve is reflected in the variation in the reference size described above.

  The first coke lump sorter 20 according to another example may employ a filter other than a sieve for sorting the first coke lump.

  The first coke mass sorter 20 sorts the first coke mass. The first coke block includes a coke block having a reference size of 8 mm or more. In one example, the first coke block includes a coke block having a size of 8 to 50 mm. In some embodiments, the first coke mass is temporarily stored in a state in which the temperature and humidity are adjusted, and after weighing, is supplied to an electric furnace for generating carbide. In some embodiments, the sorted first coke mass is adjusted for moisture content and then stored.

  The 2nd coke raw material excluded by the 1st coke lump sorter 20 does not contain the 1st coke lump with a standard size of 8 mm or more, but contains the 2nd coke lump and the coke powder below a standard size of 8 mm. In the present embodiment, the excluded second coke raw material is regenerated as a briquette having a size equal to or larger than the reference size through further steps described later.

  For reference, FIG. 2 (a) shows the first coke mass, and FIG. 2 (b) shows the second coke raw material.

  The dryer 30 dries the second coke raw material supplied from the first coke lump sorter 20. The second coke raw material is conveyed from the first coke lump sorter 20 to the dryer 30 by an arbitrary mechanism and means. In one example, the second coke raw material that has passed through the sieve of the first coke lump sorter 20 is supplied directly to the dryer 30. In another example, the 2nd coke raw material stored in the tank of the 1st coke lump sorter 20 is supplied to dryer 30 via a closed passage or an open passage, manpower, heavy machinery, or a conveyor. In some embodiments, the second coke mass is pneumatically conveyed.

  The dryer 30 is a general-purpose dryer, and includes an external or built-in heat source and a container through which the second coke mass is supplied or passes. In some embodiments, the dryer 30 includes a rotating container, and the container is rotated in any form (the dryer 30 can be a kiln-type dryer). By rotating the container while supplying hot air, drying of the second coke raw material is promoted. In some embodiments, the moisture content of the second coke raw material is dried to 10 mass% or less by drying the second coke raw material in the dryer 30. In some embodiments, the moisture content of the second coke raw material excluded by the first coke lump sorter 20 is 10% by mass or less, and thus the drying step by the dryer 30 is omitted.

  The second coke raw material storage unit 40 stores the second coke raw material having a water content of 10% by mass or less. In some embodiments, the second coke feed is stored at an ambient temperature of 10-35 ° C. There are no particular restrictions on the storage period.

  The second coke raw material stored in the second coke raw material storage unit 40 is weighed by the meter 50 and then supplied to the pulverizer 70. The briquette-derived raw material manufactured through the steps described below is measured by the measuring device 60 and then supplied to the pulverizer 70. In this case, the utilization efficiency of the coke raw material is enhanced by reusing the raw material derived from briquette. In addition, the raw material derived from briquette contains the below-mentioned binder in addition to coke powder. In the present application, this briquette-derived material is referred to as a third coke material.

  In some embodiments, a greater amount of raw material is weighed by the meter 50 as compared to the meter 60 for a given amount of raw material that is supplied for one pulverization of the grinder 70. That is, the ratio of the raw material supplied to the pulverizer 70 for one pulverization of the pulverizer 70 is such that the raw material supplied from the measuring instrument 50 to the pulverizer 70 is supplied from the measuring instrument 60 to the pulverizer 70. More than raw materials. In some embodiments, the weight of the second coke feed fed from the meter 50 for one crushing of the crusher 70 is M1, and the meter 60 is used for one crushing of the crusher 70. When the mass of the third coke raw material supplied from is M2, M1: M2 = 9: 1 is satisfied. If there is much 3rd coke raw material acquired with the vibration sieve 140 mentioned later, the value of M2 can be increased, and if it is small, the value of M2 can be decreased.

  Arbitrary types can be adopted as the measuring instruments 50 and 60. For example, the meter can measure the mass of the bag and the bag supplied with the second coke raw material supplied from the second coke raw material storage unit 40 through a sealed passage or an open passage, or a manual or heavy machine or a conveyor. Includes weighing means.

  The crusher 70 is any type of machine that crushes the second coke raw material and the optional third coke raw material. The pulverizer 70 includes at least one of a ball mill, a rod mill, a SAG mill, a self-pulverizing mill, and a high-pressure pulverizing roll, or a combination of two or more selected therefrom. The operating conditions of the pulverizer 70 are appropriately adjusted to obtain a raw material having an appropriate particle size or particle size distribution.

  As mentioned at the beginning, in some embodiments, the average particle size of the raw material after grinding is 50-1000 μm. In some embodiments, the average particle size of the raw material after pulverization is 100 to 600 μm, and a higher crushing strength (JIS Z8841) of the briquette can be secured, for example, a crushing strength of 30 kg / p to 60 kg / p or 60 kg. Crushing strength exceeding / p is ensured. By securing a high crushing strength, the third coke raw material derived from briquette can be suppressed, and generation of coke powder in the electric furnace can be reduced after the electric furnace is supplied. In the illustrated embodiment, a raw material having an average particle size of 350 μm is supplied from the pulverizer 70 to the mixer 120.

  The raw material pulverized by the pulverizer 70 is supplied to the mixer 120. A binder is also supplied to the mixer 120. The binder is stored in the binder storage unit 100, weighed by the meter 110, and then supplied to the mixer 120. A predetermined amount of binder is supplied to the mixer 120 with respect to the total amount of the second and third coke raw materials supplied from the pulverizer 70. In some embodiments, 1 to 10 parts by weight of binder is added to 100 parts by weight of the second coke feed or 100 parts by weight of the second and third coke feed. In the illustrated embodiment, 8 parts by mass are added to 100 parts by mass of the second and third coke raw materials. In some embodiments, the amount of binder added is adjusted in consideration of the amount of binder contained in the third coke raw material. For example, the supply amount of the binder derived from the binder storage unit 100 is reduced with an increase in the mass M2 of the third coke raw material described above.

  The mixer 120 includes an internal or external heat source, a mixing tank 121, and an impeller 122 (see FIG. 3). The mixer 120 can mix the raw materials by rotating the impeller 122 in the mixing tank 121, and can stir and mix the raw materials while heating them by operating an internal or external heat source. Examples of the heat source include a high-pressure steam supply source, an oil heater, and an electric heater.

  The mixer 120 mixes a coke raw material and a binder in the state which heated the inside of a mixing tank to 100 degreeC or more, for example, 140-150 degreeC. By heating the inside of the mixing tank, the viscosity of the binder decreases, and the binder can be sufficiently dispersed in the coke raw material.

  In some embodiments, the binder is fed to the mixer 120 after the viscosity is adjusted. For example, the binder is supplied to the mixer 120 in a state adjusted to 100 to 300 mPa · s.

  In some embodiments, one or more binders selected from the group consisting of tar binders, pitch binders, and asphalt binders are included. In the illustrated form, an asphalt binder is used as the binder.

  In some embodiments, water is supplied to the mixer 120 in addition to the coke feed and binder. In the illustrated example, water can be supplied from the water supply source 80 to the mixer 120 via the valve 90. An amount of water corresponding to the opening and opening time of the valve 90 can be supplied to the mixer 120. By supplying water to the mixer 120, the viscosity of the mixed material and the degree of diffusion of the binder can be adjusted. In the exemplary embodiment, the supply amount of water and the mixing time are adjusted so that the water content of the raw material mixed in the mixer 120 is 6 to 8% by mass. Since the raw materials are mixed while heating the mixing tank, the water content of the mixed material can be adjusted by adjusting the mixing time. In some embodiments, warm water of 85 ° C. or higher is supplied to the mixing tank, thereby suppressing a temperature drop in the mixing tank corresponding to the water supply.

  In some embodiments, the mixed material includes 1-10% by weight selected from the group consisting of (i) 2-10% by weight water, (ii) tar binder, pitch binder, and asphalt binder. The binder and (iii) 80 to 97% by mass of the second coke raw material are included, and the total of water, the binder, and the second coke raw material is 100% by mass or less. In other embodiments, materials other than water, binder, and coke are added to the mixed material.

  The mixing time of the mixer 120 can be determined experimentally. In some embodiments, the temperature, viscosity, and moisture content of the mixed material in the mixing tank of the mixer 120 are inspected. When the inspection result satisfies the determination condition, it is determined that the mixing is completed. This determination step is performed automatically or manually.

  The mixed material sufficiently mixed by the mixer 120 is supplied from the mixer 120 to the molding machine 130. The type of the molding machine 130 is arbitrary, and various types of molding machines can be employed. The molding machine 130 illustrated in FIG. 4 is a roll compression molding machine having a pair of rolls 132 and 133, and continuously forms briquettes while compressing the mixed material dropped from the chute 131 between the rolls 132 and 133. . In some embodiments, the mixed material is compressed at a linear pressure of 7-12 KN / cm.

  Concave portions for molding the mixed material are arranged in the circumferential direction on the peripheral surfaces of the rolls 132 and 133, and the roll 132, the concave portion and the concave portion of the roll 133 together define a molding cavity for the mixed material. . This point is as illustrated in FIG. 4, and the arrangement interval of the concave portions along the circumferential direction is the same for the rolls 132 and 133. In some embodiments, the roll is a metal roll that does not receive heat from a heating source. The mixed material having a certain degree of viscosity is filled in the recesses of each roll and cured into briquettes by the roll.

  FIG. 5 shows a number of recesses arranged in a two-dimensional manner on the peripheral surface of the roll without limitation. The arrow in FIG. 5 is the rotation direction of the roll that matches the circumferential direction of the roll, and matches the vertical direction when FIG. 5 is viewed from the front. A direction perpendicular to the circumferential direction of the roll and extending in parallel to the rotation axis of the roll is referred to as a roll width direction. As shown in FIG. 5, the recess rows in which the recesses are arranged along the circumferential direction are arranged in the width direction. The recess rows adjacent in the width direction are shifted along the circumferential direction, so that briquettes are not simultaneously formed and discharged from the respective recesses of the adjacent recess rows. In the illustrated example, briquettes are simultaneously formed and discharged from the respective concave portions of the adjacent concave rows across one concave row, and between the briquettes discharged from the respective concave portions of the adjacent concave rows across the single concave row. A thin layer of mixed material is formed. When falling from the molding machine 130, this thin layer collapses and the briquette separation is promoted.

  As shown in FIG. 5, when the depth of the recess is D and the length of the recess along the roll circumferential direction is L, D / L <0.3 is satisfied. Let W be the width of the recess along the width direction. In the particular exemplary embodiment, D = 9.4, L = 34.8 mm, W = 30 mm. The briquette formed from the concave portion having such a size is not less than a reference size, and is suitably used for generating carbide as with the first coke block. In one example, the briquette size is 10-50 mm. Considering the briquette transport process and the supply into the electric furnace, it is preferable to make the size of the briquette appropriate. In some embodiments, the maximum briquette size is no more than 5 times the reference size.

  The briquettes molded by the molding machine 130 are supplied to the vibrating sieve 140. The vibration sieve 140 includes a sieve having an opening of 10 mm, conveys briquettes supplied from the upstream side in response to vibrations, and collects binder-containing coke powder that falls in this process, that is, the third coke raw material. . The third coke raw material collected by the vibrating sieve 140 is supplied to the pulverizer 70 via the meter 60 as described above. By passing the vibrating sieve 140, a group of briquettes with reduced adhesion of coke powder can be obtained. The briquettes that have passed through the vibrating sieve 140 are stored in the briquette storage unit 150. Briquettes stored in the briquette storage unit 150 are stored within a predetermined temperature range in order to avoid or reduce deformation and crushing thereof. In some embodiments, the briquettes are stored at an ambient temperature of 10-35 ° C. In some embodiments, the use of a refrigerant cools the ambient temperature in the reservoir. Air cooling is adopted as the refrigerant, and cooling air is supplied to the storage unit. In some examples, cooling air is supplied to the lower part of the briquette storage tank to suppress softening of the briquettes in the storage tank.

  With reference to FIG. 6, it will be briefly described that the briquette group stored in the briquette storage unit 150 is used in the carbide generation process. The carbide generating device includes a briquette storage unit 150, a dryer 160, a vibrating sieve 161, an under-sieving powder tank 162, a lime furnace 170, and an electric furnace 180. The briquette storage unit 150 stores a large number of briquettes manufactured as described above, and a predetermined amount of briquettes are dried by the dryer 160 and supplied to the vibrating sieve 161. The vibration sieve 161 includes a sieve having an opening of 3 mm. The briquette after sieving is supplied to the electric furnace 180. The powder removed by the vibrating sieve 161 is supplied to the under sieve powder tank 162. The powder accumulated in the under sieve powder tank 162 is a coke raw material containing a briquette-derived binder. Similarly, limestone is converted into quicklime through heat treatment by the lime furnace 170 and supplied to the electric furnace 180. On the other hand, the powder separated by the vibrating sieve 161 is stored in the sieve powder tank 162, and the sieve powder is preferably returned to the pulverizer 70 as the fourth coke raw material via the meter 163. The electric furnace 180 includes a sealed container 181, a heating rod 182 that is induction-heated by electric power, an exhaust path 183, and a carbide discharge port 184. A box 185 for receiving molten carbide is provided at the carbide outlet 184.

  In the form illustrated in FIG. 7, a plurality of heating rods 182 are used. When quick lime and coke powder are generated in the electric furnace 180, the quick lime and coke powder are sintered, and discharge of by-product gas cannot be ensured, which may induce an explosion in the electric furnace 180. When quick lime and coke powder are generated in the electric furnace 180, the quick lime and coke powder are sintered, and the sintered product falls into a molten carbide bath, and the molten carbide may be blown outside through the exhaust passage 183. is there. When using the above-mentioned briquette, generation | occurrence | production of the quicklime and coke powder in the container 181 is suppressed, and the above-mentioned problem is avoided or reduced.

  FIG. 8 shows another embodiment. In the exemplary embodiment of FIG. 8, coke raw material stored in the under-sieving powder tank 162 shown in FIG. 6 is reused. Specifically, the coke raw material supplied from the under sieve powder tank 162 is reduced in weight by the measuring device 59 and supplied to the pulverizer 70. Even in such an embodiment, the same effect as described above can be obtained.

Example A first coke lump was selected from the first coke raw material to obtain a second coke raw material. The sieve used is the same as described above. Next, the water | moisture content of the 2nd coke raw material was adjusted to 2-10 wt% with the kiln type dryer. If the original powder coke had a water content of 10% by mass or less, drying was not necessary. The 2nd coke raw material which adjusted the water | moisture content was stored in the tank of the 2nd coke raw material storage part. The second coke raw material and the third coke raw material were weighed at a ratio of 9: 1 using a measuring device and supplied to a pulverizer.

  Powder coke pulverized and sized to a mean particle size of 350 μm by a pulverizer was supplied to the mixer. As the mixer, high-pressure steam, an oil heater, an electric heater or the like was used, and the inside of the mixer was heated to 140 to 150 ° C. The asphalt binder was weighed with a meter so that 8 parts by mass of the asphalt binder was added to 100 parts by mass of the coke raw material. This weighed asphalt binder was then added to the mixer. The amount of asphalt binder to be added was adjusted according to the return amount of the asphalt binder in the third coke raw material. In order to suitably secure the dispersibility of the asphalt binder in the coke raw material, the asphalt binder was preheated so that the viscosity of the asphalt binder was 100 to 300 mPa · s.

  In a batch type mixer, the mixture was stirred for 5 to 6 minutes, and the water content was adjusted so that the water content of the mixed material was 6 to 8% by mass. If the mixed material seems to have a lot of water, the stirring time was extended with a mixer. When the water content of the mixed raw material was small, water was added so that the water content of the mixed material was 6 to 8% by mass. Hot water of 85 ° C. or higher was added.

  The coke raw material mixed with the asphalt binder was supplied to a double roll type molding machine 130 and molded at a linear pressure of 7 to 12 KN / cm. In order to manufacture a briquette of an appropriate size, the size of the recess was 34.8 mm × 30 mm × 9.4 mm as in the above example. The formed briquette was supplied to a vibrating sieve having an opening of 10 mm, and the briquettes remaining on the sieve were dropped into a storage tank.

Test 1
When the temperature and viscosity of asphalt supplied to the mixer were used as variables, the crushing strength of the briquette finally obtained changed as shown in Table 1. In light of Table 1, it can be seen that the temperature of the asphalt supplied to the mixer 120 is preferably 130 ° C. or higher or 140 ° C. or higher.
<Conditions>
Roll speed 12.5rpm
Molding pressure: 8.1kN / cm
Asphalt binder (propane asphalt: Showa Shell Sekiyu KK, softening point 6
Addition amount: 8% by mass
Mixing temperature: 82 ~ 86 ℃
Moisture in mixed material: 6 to 7.6% by mass
Briquette size: 36.6 × 34.7 × 9.1mm

Test 2
When the particle size of the coke raw material supplied to the mixer was a variable, the crushing strength of the briquette finally obtained changed as shown in Table 2. In addition, briquette crushing strength differs in briquette size between upper and lower stages. In light of Table 2, it can be seen that the average particle size of the coke raw material supplied to the mixer 120 is preferably 50 μm to 1000 μm, or 100 μm to 800 μm.
<Conditions>
Roll rotation speed 12.5rpm (36.6 × 34.7 × 9.1mm)
Molding pressure: 8.1kN / cm (36.6 × 34.7 × 9.1mm)
Asphalt binder (same as Test 1): 8% by mass
Mixing temperature: 78-85 ° C
Moisture in mixed material: 7 to 8.3 mass%

Test 3
When the sulfur content contained in the coke raw material was a variable, the crushing strength of the briquette finally obtained changed as shown in Table 3. As can be seen from Table 3, the sulfur content needs to be 3% by weight or less, and the test result of the sulfur content of 5% by weight is a comparative example.
<Conditions>
Roll speed 12.5rpm
Molding pressure: 8.1kN / cm
Asphalt binder (same as Test 1): 8% by mass
Mixing temperature: 85-91 ° C
Moisture in mixed material: 7.8% by mass
Briquette size: 36.6 × 34.7 × 9.1mm

Test 4
When the temperature of the formed briquette was used as a variable, the crushing strength of the briquette changed as shown in Table 4. As can be seen from Table 4, the briquette temperature is preferably maintained at 10-35 ° C or 20-35 ° C.
<Conditions>
Roll speed 12.5rpm
Molding pressure: 8.1kN / cm
Asphalt binder (same as Test 1): 8% by mass
Mixing temperature: 85-91 ° C
Moisture in mixed material: 7.8% by mass
Briquette size: 36.6 × 34.7 × 9.1mm

Test 5
When the water content of the second coke raw material before being supplied to the mixer was a variable, the crushing strength of the briquette changed as shown in Table 5. As can be seen from Table 5, the water content of the second coke raw material is preferably 4 to 12% by mass, more preferably 6 to 10% by mass.
<Conditions>
Roll rotation speed: 12.5rpm
Molding pressure: 8.1kN / cm
Asphalt binder (same as Test 1): 8% by mass
Mixing temperature: 80-85 ° C

Test 6
When the addition amount of the binder added to the coke raw material was a variable, the crushing strength of the briquettes changed as shown in Table 6. As can be seen from Table 6, the amount of binder added is preferably 5% by mass or more. If the amount of the binder is too large, the crushing strength of the briquettes becomes strong, but adversely affects the carbide quality (settability), so 7 to 9 parts by mass of binder is added to 100 parts by mass of the coke raw material.
<Conditions>
Roll rotation speed: 12.5rpm
Molding pressure: 8.1kN / cm
Asphalt binder (same as Test 1): 8% by mass
Moisture in mixed material: 7.2 to 8.3 mass%
Mixing temperature: 80-85 ° C (Settling control value: 640-850ml)

  Carbide sedimentation is determined as follows. 1) Prepare water of 20 ° C. (normal temperature) and 1000 cc, and prepare 100 g of carbide pulverized to 10 mm or less. 2) Transfer 960 cc of the prepared water to a 1000 cc graduated cylinder. 3) Add the carbide little by little so as not to overflow the measuring cylinder within 20 minutes. 4) When the bubbles disappear, add the remaining 40 cc of water to make a total of 1000 cc. 5) Stir well, let stand, and obtain the slurry height after 2 hours on the basis of graduated cylinder volume (ml). The slurry height (ml) is measured starting from the cylindrical base end of the graduated cylinder, and is obtained on the basis of the graduated cylinder capacity (ml).

Test 7
When the mixed raw material temperature was a variable, the crushing strength of the briquettes changed as shown in Table 7. As can be seen from Table 7, the mixed raw material temperature is preferably in the range of 70 to 95 ° C, more preferably 80 to 90 ° C.
<Conditions>
Roll rotation speed: 12.5rpm
Molding pressure: 8.1kN / cm
Moisture in mixed material: 7.5-8.0% by mass
Asphalt binder (same as Test 1): 8% by mass

  Based on the above teachings, one of ordinary skill in the art can make various modifications to each embodiment.

DESCRIPTION OF SYMBOLS 10 1st coke raw material supply machine 20 1st coke lump sorter 30 Dryer 40 2nd coke raw material storage part 50 Measuring instrument 60 Measuring instrument 70 Pulverizer 80 Water supply source 90 Valve 100 Binder storage part 110 Measuring instrument 120 Mixer 130 Forming machine 140 Vibrating sieve 150 Briquette storage

Claims (14)

A step of selecting a first coke mass having a reference size or more from a first coke raw material having a sulfur content of 3% by mass or less;
At least one binder selected from the group consisting of a tar binder, a pitch binder, and an asphalt binder, a second coke raw material obtained by removing the first coke lump from the first coke raw material, and water are prepared. Mixing at a controlled temperature condition;
Supplying at least the one or more binders, the second coke raw material, and the mixed material containing water to the recesses arranged to face each other in the rotation process of a pair of rolls each provided with a molding recess. And the manufacturing method of a briquette including the process of shape | molding into the briquette more than the said reference | standard size.   2. The method further comprises a step of pulverizing a second coke mass less than the reference size contained in the second coke raw material before the step of mixing at least the one or more binders, the second coke raw material, and the water. The manufacturing method of briquette as described in 2.   The manufacturing method of the briquette of Claim 2 whose average particle diameters of the said 2nd coke raw material after a grinding | pulverization are 50 micrometers-1000 micrometers.   The manufacturing method of the briquette of Claim 2 or 3 further including the process of drying the said 2nd coke raw material before the process of grind | pulverizing the said 2nd coke lump. Supplying the briquette to a vibrating sieve to remove excess powder adhering to the briquette or collapsing from the briquette;
5. The method according to claim 1, further comprising a step of adding the removed excess powder to the second coke raw material before the step of mixing at least the one or more binders, the second coke raw material, and the water. The manufacturing method of the briquette as described in any one.   The briquette according to any one of claims 1 to 5, wherein the step of mixing at least the one or more binders, the second coke raw material, and the water is performed under a temperature condition adjusted to 70 to 95 ° C. Manufacturing method.   The briquette manufacturing method according to claim 1, wherein D / L <0.3 is satisfied, where D is the depth of the recess and L is the length in the circumferential direction of the roll.   The briquette manufacturing method according to any one of claims 1 to 7, wherein the reference size is a value of less than 10 mm.   The mixed material includes at least (i) 2 to 10% by mass of water, (ii) 1 to 10% by mass of a binder selected from the group consisting of a tar binder, a pitch binder, and an asphalt binder, and (iii) The manufacturing method of the briquette as described in any one of Claims 1 thru | or 8 in which 80-97 mass% 2nd coke raw material is contained.   The briquette manufacturing method according to any one of claims 1 to 9, wherein the one or more binders include propane asphalt.   The briquette manufacturing method according to any one of claims 1 to 10, wherein the one or more binders have a viscosity of 500 mPa · s or less.   The manufacturing method of the briquette as described in any one of Claims 1 thru | or 11 with which the said briquette is maintained in the temperature range of 10-35 degreeC.   The manufacturing method of the briquette as described in any one of Claims 1 thru | or 12 whose maximum size of the said briquette is 5 times or less of the said reference | standard size. A step of mixing briquette produced by the method for producing briquette according to any one of claims 1 to 13 with quick lime as an additional carbon source to the first coke mass or as an alternative carbon source to the first coke mass; ,
The manufacturing method of calcium carbide including the process of heating the said briquette and the said quicklime to 2000 degreeC or more with a zetaberg type electrode in an electric furnace.