Manufacturing method of humidity control building material

Abstract

To provide a method for producing a humidity control building material capable of recycling incineration main ash with energy saving.SOLUTION: A production method of humidity control building material of the present invention includes the following steps: a classification step S11 for classifying the incinerated main ash; a carbonation step S12 for carbonating the incinerated main ash of a prescribed range of particle sizes after the classification step S11; a kneading step S13 in which the carbonated incineration main ash after the carbonation step S12, aggregate, cement, and admixture are kneaded to form a mixture; and a molding step S14 for molding the mixture after the kneading step S13 to produce a humidity-controlled building material.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a method for producing a humidity-regulating building material and the humidity-regulating building material. [Background technology]

[0002] It is known that molten slag, which is made by melting and solidifying incineration ash generated at incineration facilities, can be used as a construction material (for example, Patent Document 1). Melting reduces the volume of incineration ash and can render heavy metals harmless. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-194240 Summary of the Invention [Problem to be solved by the invention]

[0004] However, melting requires a huge amount of energy to melt the incineration ash at a high temperature of over 1000℃ and then solidify it by cooling, which makes it difficult to apply to general use. In addition, the recycling rate of incineration ash relative to the amount of waste generated remains low, and new developments are needed.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a humidity-regulating building material and a manufacturing method thereof that can recycle incineration bottom ash in an energy-saving manner. [Means for solving the problem]

[0006] In order to achieve the above object, a manufacturing method for a humidity-regulating building material according to one embodiment of the present disclosure includes a classification process for classifying incineration bottom ash, a carbonation process for carbonating the incineration bottom ash having a particle size within a predetermined range after the classification process, a kneading process for kneading the incineration bottom ash that has been subjected to the carbonation process, aggregate, cement, and admixtures to produce a mixture, and a molding process for molding the mixture after the kneading process to produce a humidity-regulating building material.

[0007] In a preferred embodiment of the method for producing a moisture-regulating building material, the mixture contains the incineration bottom ash and the aggregate, and the content of the incineration bottom ash is 5% by mass or more and 21% by mass or less.

[0008] In a preferred embodiment of the method for producing a moisture-regulating construction material, the predetermined range is 150 μm or more and 2.5 mm or less.

[0009] In order to achieve the above object, a humidity-regulating construction material according to one embodiment of the present disclosure is manufactured by the above-mentioned method for manufacturing a humidity-regulating construction material. Effect of the Invention

[0010] According to the present disclosure, incineration bottom ash can be recycled as a humidity-regulating building material while saving energy. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a flow chart showing a method for producing a humidity-regulating construction material according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing an example of a manufacturing system for a humidity-controlling construction material according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to the description of the following embodiments. In addition, the components in the following embodiments include those that are replaceable and easy for a person skilled in the art, or those that are substantially the same. Furthermore, the components in the embodiments described below can be omitted, replaced, or modified in various ways without departing from the gist of the present disclosure. In the following embodiments, components necessary for illustrating the embodiments of the present disclosure will be described, and other components will be omitted.

[0013] (Embodiment) Fig. 1 is a flow chart showing a manufacturing method of a humidity control building material 100 according to an embodiment. Fig. 2 is a schematic diagram showing an example of a manufacturing system 1 for the humidity control building material 100 according to an embodiment. The manufacturing method of the humidity control building material 100 according to the embodiment is a manufacturing method of a humidity control building material 100 containing cement mixed with incineration bottom ash 110. The humidity control building material 100 containing cement is, for example, concrete, mortar, blocks, unfired bricks, etc. The humidity control building material 100 is a building material having hygroscopic properties.

[0014] 1, the manufacturing method of the humidity control building material 100 of the embodiment includes a classification process S11, a carbonation process S12, a kneading process S13, and a molding process S14. Also, as shown in FIG. 2, the manufacturing system 1 of the humidity control building material 100 of the embodiment includes a classifier 10, a carbonation treatment device 20, a kneader 30, and a molding machine 40.

[0015] The classification step S11 is a step of classifying the incineration bottom ash 110. The incineration bottom ash 110 refers to the incineration residue among the incineration ash collected from the bottom of an incinerator, etc., and is distinguished from the incineration fly ash that is blown up together with the combustion gas and collected by a dust collector. The main components of the incineration bottom ash 110 are calcium oxide (CaO), silicon dioxide (SiO 2 ), aluminum oxide (Al 2 O 3 ) etc.

[0016] In the embodiment, the classification step S11 is performed in a classifier 10 of the manufacturing system 1. As shown in Fig. 2, the classifier 10 classifies the incineration bottom ash 110 discharged from the incineration facility according to particle size, shape, and the like. The incineration bottom ash 110 is classified by the classifier 10 into incineration bottom ash 111 having a particle size within a predetermined range and incineration bottom ash 112 having a particle size outside the predetermined range, and only the incineration bottom ash 111 having a particle size within the predetermined range is transported to the carbonation treatment device 20. In the embodiment, the predetermined range is 150 µm or more and 2.5 mm or less.

[0017] The classifier 10 may be a classification and sorting equipment having a function of separating incineration bottom ash, scrap iron, iron-based impurities, etc. from the incineration residue. The classification and sorting equipment roughly separates the incineration residue using, for example, a skeleton bucket. Residues smaller than a predetermined size are, for example, disposed of as a final disposal. The classification and sorting equipment collects large scrap iron from granules and powders of a predetermined size or larger using, for example, a weak magnetic separator. Next, the classification and sorting equipment removes fine iron-based impurities such as nails and wires using, for example, a strong magnetic separator. The collected scrap iron is disposed of, for example, by a specialized company. Next, the classification and sorting equipment classifies powders such as the incineration bottom ash 110 according to particle size and shape, etc. Residues larger than a predetermined size are, for example, disposed of as a final disposal.

[0018] The carbonation step S12 is a step of performing a carbonation treatment on the incineration bottom ash 111 having a particle size within a predetermined range. The carbonation treatment in the carbonation step S12 is performed by adding carbon dioxide gas (carbon dioxide (CO 2 The carbon dioxide gas used in the carbonation step S12 is, for example, carbon dioxide gas discharged from a thermal power plant that uses coal, petroleum, natural gas, or the like as fuel.

[0019] In the embodiment, the carbonation step S12 is performed in the carbonation treatment device 20 of the manufacturing system 1. As shown in Fig. 2, incineration bottom ash 111 having a particle size within a predetermined range conveyed from the classifier 10 is carried into the carbonation treatment device 20. Carbon dioxide gas is introduced into the carbonation treatment device 20.

[0020] In the carbonation step S12, the incineration bottom ash 111 is placed in a container (carbonation treatment tank) of the carbonation treatment device 20. The container is, for example, a portable container having a substantially rectangular parallelepiped shape. The portable container can be placed on the bed of a vehicle, for example. The container has a partition wall that divides the internal space vertically. The partition wall is a plate-shaped member parallel to the bottom surface of the container and has multiple ventilation holes. The incineration bottom ash 110 is placed on the partition wall.

[0021] With the incineration bottom ash 111 placed on the partition, carbon dioxide gas is introduced into the space below the partition. The carbon dioxide gas comes into contact with the incineration bottom ash 111 through the ventilation hole in the partition. The incineration bottom ash 111 is carbonated by absorbing the carbon dioxide gas. Specifically, calcium components such as calcium oxide contained in the incineration bottom ash 111 are carbonated to form calcium carbonate (CaCO 3 ) is produced. Carbon dioxide is absorbed into the incineration bottom ash 111 by the carbonation step S12.

[0022] That is, carbon dioxide is fixed in the incineration bottom ash 111 as carbonate. Furthermore, heavy metals such as lead (Pb) contained in the incineration bottom ash 111 become less soluble by the carbonation step S12. In the carbonation step S12, while the carbonation treatment is being performed, that is, while carbon dioxide gas is being introduced into the container containing the incineration bottom ash 111, it is preferable to stir the incineration bottom ash 111 so that the carbonation gas is uniformly in contact with the incineration bottom ash 111. The incineration bottom ash 120 that has been subjected to the carbonation treatment is transported to the kneader 30.

[0023] The kneading step S13 is a step of kneading the incineration bottom ash 120 that has been subjected to the carbonation treatment with aggregate, cement, and admixtures. More specifically, in the kneading step S13, the incineration bottom ash 120 that has been classified into a predetermined particle size range in the classification step S11 and has been subjected to the carbonation treatment in the carbonation step S12, and the mixture 130 containing aggregate, cement, and admixtures are kneaded to prepare a raw material for the humidity-regulating building material 100 containing cement.

[0024] In the embodiment, the kneading step S13 is performed in the kneader 30 of the manufacturing system 1. As shown in Fig. 2, the incineration bottom ash 120 discharged from the carbonation treatment device 20, aggregate including fine aggregate and coarse aggregate, cement, and admixtures are carried into the kneader 30. In the kneading step S13, for example, first, a mixture including the incineration bottom ash 120 subjected to the carbonation treatment, aggregate, and cement is kneaded, and then the kneaded mixture, water, and admixtures may be kneaded.

[0025] In the kneading step S13, a part of the aggregate is replaced with the incineration bottom ash 120. The amount of aggregate is reduced by the amount of the incineration bottom ash 120 used. In the kneading step S13, the incineration bottom ash 120, cement, aggregate including fine aggregate and coarse aggregate are weighed and then fed into the kneader 30. The mixture fed into the kneader 30 is kneaded for, for example, 30 seconds or more.

[0026] In the kneading step S13, the water and the admixture are each weighed and then fed into the kneader 30 containing the mixture. The admixture is an agent for adjusting the air content and fluidity of concrete and the like. The mixture, water, and the admixture are kneaded for, for example, 90 seconds or more. This produces a mixture 130 that is a raw material for the moisture-regulating building material 100 containing cement. In the embodiment, the mixture 130 contains the incineration bottom ash 120 and the aggregate, and the content of the incineration bottom ash 120 is 5% by mass or more and 21% by mass or less.

[0027] The molding step S14 is a step of manufacturing the humidity-conditioning building material 100 by molding the mixture 130 into a predetermined shape. In the embodiment, the molding step S14 is performed in the molding machine 40 of the manufacturing system 1. As shown in FIG. 2, the mixture 130 discharged from the kneader 30 is carried into the molding machine 40. In the molding step S14, when the humidity-conditioning building material 100 is molded by press molding, the molding machine 40 may include, for example, a formwork into which the mixture 130, which is a fluid, is poured, a pump that pressure-feeds the mixture 130 into the formwork, and a press machine that presses the mixture 130 in the formwork. In the molding step S14, when the humidity-conditioning building material 100 is molded by extrusion molding, the molding machine 40 may include, for example, an extruder that extrudes the mixture 130 from a mold, a cooling water tank that cools and solidifies the extruded mixture 130, a puller that pulls out the solidified molded product, and a cutter that cuts the mixture to a predetermined length. In this manner, the molding machine 40 suited to the application molds the mixture 130 into a predetermined shape, thereby producing the moisture-regulating construction material 100 containing cement.

[0028] As described above, the manufacturing method of the humidity-conditioning building material 100 of the embodiment includes a classification step S11 for classifying the incineration bottom ash 110, a carbonation step S12 for carbonating the incineration bottom ash 111 having a particle size within a predetermined range after the classification step S11, a kneading step S13 for kneading the incineration bottom ash 120 subjected to the carbonation treatment, aggregate, cement and admixture after the carbonation step S12 to generate a mixture 130, and a molding step S14 for molding the mixture 130 after the kneading step S13 to manufacture the humidity-conditioning building material 100. The humidity-conditioning building material 100 of the embodiment is manufactured by the manufacturing method of the humidity-conditioning building material 100 described above.

[0029] The incineration bottom ash 110 has a porous pore structure, and this pore structure has an excellent moisture absorption effect. By limiting the particle size of the incineration bottom ash 110 used as the aggregate of the humidity-conditioning building material 100 in the classification step S11 to a predetermined range, the pore structure of the incineration bottom ash 110 can be made uniform, so that the moisture absorption effect of the humidity-conditioning building material 100 can be made uniform. In addition, the carbonation step S12 can make heavy metals such as lead contained in the incineration bottom ash 110 less soluble, so that the elution of lead and the like from the humidity-conditioning building material 100 containing the carbonated incineration bottom ash 120 can be suppressed. Furthermore, the manufacturing method of the humidity-conditioning building material 100 of the embodiment can recycle the incineration bottom ash 110 simply and with less energy than melting, which requires high temperature or cooling from high temperature.

[0030] In the manufacturing method of the humidity control building material 100 of the embodiment, the mixture 130 contains the incineration bottom ash 120 and the aggregate, and the content of the incineration bottom ash 120 is 5% by mass or more and 21% by mass or less. This makes it possible to obtain a humidity control building material 100 that has both a high moisture absorption effect and sufficient strength.

[0031] In the manufacturing method of the humidity control construction material 100 of the embodiment, the predetermined range is 150 μm or more and 2.5 mm or less. This makes it possible to make the moisture absorption effect of the humidity control construction material 100 uniform and improve the moisture absorption effect.

[0032] Each configuration described in each embodiment may be combined with other configurations in each embodiment without departing from the spirit of the invention. Furthermore, each of these configurations may be combined with configurations in other embodiments different from each embodiment without departing from the spirit of the invention. Furthermore, various modifications may be made without departing from the spirit of the invention.

[0033] For example, the carbon dioxide gas used in the carbonation step S12 does not necessarily have to be carbon dioxide gas discharged from a thermal power plant that uses coal, petroleum, natural gas, or the like as fuel. The carbon dioxide gas may be carbon dioxide gas discharged from, for example, a factory such as a cement manufacturing plant, a chemical plant, an incineration facility, or the like. The carbon dioxide gas may be gas generated for use in the carbonation step S12.

[0034] In the kneading step S13, the mixture kneaded does not necessarily contain fine aggregate and coarse aggregate. For example, when the humidity control building material 100 is mortar, the mixture kneaded in the kneading step S13 does not contain coarse aggregate. [Explanation of symbols]

[0035] 1. Manufacturing System 10 Classifier 20 Carbonation treatment device 30 Kneader 40 Molding machine 100 Humidity Control Building Materials 110, 111, 112, 120 Bottom ash 130 mixture S11 Classification process S12 Carbonation process S13 Mixing process S14 Molding process

Claims

1. A classification process for classifying the incineration bottom ash; a carbonation step in which only the classified incineration bottom ash and CO 2 having a particle size within a predetermined range are introduced into a carbonation treatment device after the classification step, and carbonation treatment is performed in the carbonation treatment device; A kneading step of kneading the incineration bottom ash that has been subjected to the carbonation treatment after the carbonation step, aggregate, cement and admixture to produce a mixture; a molding step of molding the mixture after the kneading step to produce a humidity-regulating building material; A method for producing a moisture-regulating building material comprising the steps of:

2. In the kneading step, a mixture containing the incineration bottom ash that has been subjected to a carbonation treatment after the carbonation step, aggregate, and cement is kneaded, and then the kneaded mixture is kneaded with water and an admixture. A method for producing the humidity-regulating building material according to claim 1.

3. The mixture is composed of the incineration bottom ash and the aggregate, and the content of the incineration bottom ash is 5% by mass or more and 21% by mass or less. A method for producing the humidity-regulating building material according to claim 1 or 2.

4. The predetermined range is 150 μm or more and 2.5 mm or less. A method for producing the humidity-regulating building material according to any one of claims 1 to 3.

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