Method for producing iron ion eluate and iron ion eluate

Abstract

To provide a method for producing an iron ion eluent that can suppress the generation of hydrogen sulfide due to iron ions for a long period of time, and to provide the iron ion eluent. [Solution] The iron ion eluting body 5 comprises an iron casting 3 and a secondary carbon mass 4 that is formed integrally with the iron casting 3 inside the iron casting 3. The secondary carbon mass 4 is a carbon mass formed by a random mixture of multiple carbon materials 11, some of which protrude from the surface SU1 of the iron casting 3. Of the multiple carbon materials 11 that form the secondary carbon mass 4, one or more carbon materials 11 that exist in the area that protrudes from the surface SU1 are partially exposed, and the carbon materials 11 other than the one or more carbon materials are surrounded by the iron casting 3 and are not exposed.

Description

[Technical Field]

[0001] The present invention relates to a method for producing an iron ion eluent and an iron ion eluent. [Background technology]

[0002] It has been known that hydrogen sulfide generated from wastewater flowing through sewer pipes can cause corrosion of the pipes. A known method for removing hydrogen sulfide generated in sewer pipes is to submerge an eluent that elutes iron ions in the wastewater. This method allows chemical components present in the wastewater to bind with divalent iron ions, suppressing the generation of hydrogen sulfide.

[0003] Patent Document 1 proposes an iron ion supply structure using cast iron as an elution body for eluting iron ions. Specifically, as shown in FIG. 1 of Patent Document 1, the iron ion supply structure (1a) includes a flat cast iron plate (2a) and a plurality of cast iron blocks (3a) protruding from the cast iron plate (2a). The cast iron blocks (3a) include a carbonaceous material (4) having an exposed portion exposed from the surface and an embedded portion embedded inside. A cast iron hook (6a) is provided on the back surface of the cast iron plate (2a).

[0004] By submerging such an iron ion supply structure (1a) in wastewater, the chemical components present in the wastewater are bound to the divalent iron ions, making it possible to suppress the generation of hydrogen sulfide. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7495771 Summary of the Invention [Problem to be solved by the invention]

[0006] In the aforementioned Patent Document 1, four carbonaceous materials (4), each including a buried portion (4b) and an exposed portion (4a), are arranged for one vanishing block (3b) (see FIG. 4 of Patent Document 1). The buried portions (4b) of each buried portion (4b) in the vanishing block (3b) are all configured to have the same immersion length. Because the carbonaceous materials (4) submerged in wastewater gradually chip and decay, the carbonaceous materials (4) will eventually fall off the cast iron block (3a). If the buried portions (4b) are the same immersion length, all four carbonaceous materials (4) are likely to fall off at the same time. If all four carbonaceous materials (4) are lost, the local battery functioning due to the close contact between iron and carbon will no longer function, and the generation of hydrogen sulfide cannot be suppressed.

[0007] Therefore, an object of the present invention is to provide a method for producing an iron ion eluent that can suppress the generation of hydrogen sulfide due to iron ions for a long period of time, and an iron ion eluent. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a method for producing an iron ion eluting body, the method comprising the steps of: a first step of producing a primary carbon lump from a mixture of multiple carbon materials and an adhesive; a second step of pressing the primary carbon lump into the bottom surface of the sand casting mold; a third step of pouring molten iron into the sand casting mold and forming the molten iron into the shape of the sand casting mold while replacing the adhesive of the primary carbon lump with the molten iron to produce a secondary carbon lump; a fourth step of cooling the molten iron poured into the sand casting mold to produce an iron casting containing the secondary carbon lump inside so that the portion of the secondary carbon lump pressed into the bottom surface protrudes from the surface; and a fifth step of destroying the sand casting mold and removing the iron casting.

[0009] Here, it is preferable that in the first step, a plurality of primary carbon lumps are produced, and in the second step, at least some of the plurality of primary carbon lumps are pressed and positioned at a fixed interval against the bottom surface of the sand mold.

[0010] In the second step, it is preferable that all of the plurality of primary carbon lumps are pressed onto the bottom surface at regular intervals.

[0011] In the second step, it is preferable that some of the plurality of primary carbon lumps are freely disposed inside the sand mold without being fixed to the bottom surface.

[0012] Furthermore, it is preferable that, of the multiple carbon materials constituting the secondary carbon mass, one or more carbon materials present in the area protruding from the surface are exposed, and that carbon materials other than the one or more carbon materials are surrounded by the iron casting and are not exposed.

[0013] The present invention also provides an iron ion eluting body comprising an iron casting and a carbon mass formed by randomly mixing a plurality of carbon materials, the carbon mass being integrally formed with the iron casting within the iron casting so that a portion of the carbon mass protrudes from the surface of the iron casting, wherein one or more of the carbon materials constituting the carbon mass are partially exposed in an area protruding from the surface, and carbon materials other than the one or more carbon materials are surrounded by the iron casting and are not exposed.

[0014] Here, it is preferable that the plurality of carbon materials constituting the carbon mass have different shapes or sizes.

[0015] It is also preferable that each of the plurality of carbon materials has an irregular shape with irregularities on the surface. [Effects of the Invention]

[0016] According to the present invention, an iron ion eluting body is obtained, which includes an iron casting and a carbon mass integrally formed with the iron casting. The carbon mass is composed of multiple carbon materials randomly mixed, with some of the carbon materials protruding from the surface of the iron casting. Of the multiple carbon materials constituting the carbon mass, one or more carbon materials present in the area protruding from the surface of the iron casting are partially exposed. Meanwhile, carbon materials other than the one or more carbon materials are surrounded by the iron casting and not exposed. When such an iron ion eluting body is submerged in wastewater, the one or more carbon materials exposed from the surface of the iron casting deteriorate first. Therefore, not all of the multiple carbon materials constituting the carbon mass fall off at the same time. Even if some carbon materials fall off, as long as carbon materials remain in the iron casting, electrons continue to flow from the iron casting (iron) to the carbon material (carbon), allowing iron ions to dissolve in the wastewater over a long period of time. As a result, it is possible to suppress the generation of hydrogen sulfide caused by iron ions over a long period of time.

[0017] Incidentally, the above-mentioned Patent Document 1 does not describe at all any specific configuration for suppressing the generation of hydrogen sulfide by iron ions over a long period of time, such as the manufacturing method of the iron ion eluent of the present invention and the iron ion eluent. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a flow chart showing each step of a method for producing an iron ion eluting body according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing an example of a primary carbon mass in which a plurality of carbon materials and an adhesive are mixed. [Figure 3] 1A is a plan view and FIG. 1B is a side view showing the state in which the primary carbon mass is placed on the bottom surface of the sand mold. [Figure 4] FIG. 1 is a diagram showing an example of an iron casting (iron ion elution body) containing secondary carbon lumps inside. [Figure 5] FIG. 1 shows a sample of an iron ion eluate that has been submerged in water for a certain period of time. DETAILED DESCRIPTION OF THE INVENTION

[0019] <1. Embodiment> A method for manufacturing an iron ion eluent and the iron ion eluent according to an embodiment of the present invention will be described with reference to Figures 1 to 5. Below, each step of the method for manufacturing an iron ion eluent will be described in detail according to the flow chart of Figure 1, and then the specific configuration of the iron ion eluent manufactured by the manufacturing method (see Figure 4) will be described.

[0020] As shown in FIG. 1, the method for producing an iron ion eluent is roughly divided into five steps (steps S1 to S5).

[0021] The first step S1 is a step of producing a plurality of primary carbon lumps 1 as shown in Fig. 2. The primary carbon lumps 1 are a mixture (one lump) of a plurality of carbon materials 11 (11a, 11b, 11c...) and an adhesive.

[0022] Each carbon material 11 is composed of, for example, carbon material grains or carbon material fragments with irregular fracture surfaces. An epoxy adhesive (resin adhesive) that does not contain ceramic is used as the adhesive. Here, the multiple carbon materials 11 (11a, 11b, 11c, etc.) that are different in shape and size are used.

[0023] In particular, in this embodiment, each carbon material 11 has an irregular shape with unevenness formed on the surface. Also, since iron ions are eluted as electrons move from iron to carbon, the carbon material 11 preferably has a carbon content of 80% or more. Furthermore, in order to allow moisture to continuously penetrate the carbon material, the carbon material 11 preferably has a porous structure with many holes (pores) inside, providing air permeability.

[0024] A general mixer / stirrer is used to mix the plurality of carbon materials 11 (11a, 11b, 11c...) with the adhesive. Specifically, the plurality of carbon materials 11 (11a, 11b, 11c...) and the adhesive are put into the mixer / stirrer, and the mixer is operated to generate a primary carbon mass 1 in which the plurality of carbon materials (11a, 11b, 11c...) are randomly mixed.

[0025] 3, the second step S2 is a step of pressing and fixing the multiple primary carbon lumps 1 produced in the first step S1 into the bottom surface 2B of the sand mold 2 at regular intervals. In this embodiment, all of the multiple primary carbon lumps 1 produced in the first step S1 are pressed into the bottom surface 2B of the sand mold 2 at regular intervals.

[0026] 3, for the sake of simplicity, only a portion of the sand mold 2 is shown removed. In reality, the sand mold 2 will be wider, and more primary carbon lumps 1 will be pressed into the bottom surface of the sand mold 2 and fixed therein.

[0027] As shown in Figure 3, each primary carbon lump 1 is configured to be smaller than the width WD of the sand mold 2 (see Figure 3(A)) and smaller than the height HG of the sand mold 2 (see Figure 3(B)). This is to prevent the primary carbon lump 1 from blocking the molten iron flowing through the internal space 2S of the sand mold 2 when the molten iron is poured into the sand mold 2.

[0028] The third step S3 is a step of pouring molten iron into the sand mold 2 with the plurality of primary carbon lumps 1 fixedly arranged on the bottom surface.

[0029] When molten iron is poured into the sand mold 2, it flows through the internal space 2S of the sand mold 2, eventually filling the entire internal space 2S with molten iron. When the high-temperature molten iron reaches the primary carbon lump 1, the adhesive in the primary carbon lump 1 disappears and is replaced by the molten iron. Because the molten iron easily solidifies, most of the carbon material 11 that made up the primary carbon lump 1 remains bonded to one another by the molten iron. As a result, a secondary carbon lump 4 is produced in which multiple carbon materials 11 are bonded to one another by the molten iron, as shown in Figure 4. Furthermore, as the molten iron fills the internal space 2S of the sand mold 2, the molten iron is formed into the shape of the sand mold 2.

[0030] As shown in Figure 4, when the adhesive of the primary carbon lump 1 disappears and is replaced by the molten iron, some of the carbon material 11 that constitutes the primary carbon lump 1 detaches from the primary carbon lump 1. Some of the detached carbon material 11 moves within the internal space 2S of the sand mold 2 with the flow of the molten iron.

[0031] The fourth step S4 is a step of cooling the molten iron (filled molten iron) poured into the internal space 2S of the sand mold 2. When the molten iron is cooled, an iron casting is produced that contains the secondary carbon lumps 4 inside, with some of the secondary carbon lumps 4 protruding from the surface SU1. The portions protruding from the surface SU1 correspond to the areas of the primary carbon lumps 1 that are pressed into the bottom surface 2B of the sand mold 2.

[0032] The fifth step S5 is a step of breaking the sand mold 2 and extracting the iron casting 3 containing the secondary carbon lumps 4 as an iron ion eluate 5. When the sand mold 2 is broken, the iron ion eluate 5 as shown in FIG.

[0033] As shown in Figure 4, the iron ion elution body 5 is composed of an iron casting 3 formed from molten iron into the shape of a sand mold 2, and a secondary carbon lump 4 formed by a random mixture of a plurality of carbon materials 11. A portion of the secondary carbon lump 4 protrudes downward from the surface SU1 (bottom surface) of the iron casting 3. Inside the iron casting 3, there is also detached carbon material, which is some of the carbon material 11 that constituted the primary carbon lump 1 that has detached and moved.

[0034] Furthermore, some of the carbon materials 11 constituting the secondary carbon mass 4 are exposed from the surface SU1, while the remaining carbon materials are surrounded by the iron casting 3 and are not exposed from the surface SU1.

[0035] 5 shows a sample of an iron-ion eluting body 5 produced by the method for producing an iron-ion eluting body according to this embodiment, which was submerged in water for a certain period of time. As shown in FIG. 5, in the sample of iron-ion eluting body 5, it can be seen that the iron casting 3 has deteriorated and some of the carbon material 11 constituting the secondary carbon mass 4 has chipped or decayed. On the other hand, it can be seen that some of the carbon material 11 constituting the secondary carbon mass 4 is still retained in the iron casting 3. In other words, it can be seen that the carbon material 11 constituting the secondary carbon mass 4 is gradually released.

[0036] According to the above-described embodiment, an iron ion eluting body 5 is obtained that includes an iron casting 3 and a secondary carbon mass 4 that is integrally formed with the iron casting 3. The secondary carbon mass 4 is made up of a random mixture of multiple carbon materials 11, and is configured so that some of the carbon materials 11 protrude from the surface SU1 of the iron casting 3. Of the multiple carbon materials 11 that make up the secondary carbon mass 4, one or more carbon materials 11 that are present in an area that protrudes from the surface SU1 of the iron casting 3 are partially exposed. On the other hand, the carbon materials 11 other than the one or more carbon materials 11 are surrounded by the iron casting 3 and are not exposed.

[0037] When such an iron ion eluting body 5 is submerged in wastewater, degradation begins with one or more carbon materials 11 exposed on the surface SU1 of the iron casting 3. Therefore, not all of the carbon materials 11 constituting the secondary carbon mass 4 fall off at the same time. Even if some of the carbon materials 11 fall off, as long as some carbon materials 11 remain on the iron casting 3, electrons continue to flow from the iron casting 3 (iron) to the carbon materials 11 (carbon). As a result, iron ions continue to dissolve in the wastewater for a long period of time, making it possible to suppress the generation of hydrogen sulfide caused by iron ions for a long period of time.

[0038] Furthermore, according to the above-described embodiment, all of the primary carbon lumps 1 are arranged at intervals on the bottom surface, as shown in Fig. 3. Therefore, in the iron ion eluting body 5, which is the final product, the carbon material 11 can be arranged relatively evenly.

[0039] Furthermore, according to the above-described embodiment, a plurality of carbon materials 11 having different shapes and sizes are used as the carbon materials that make up the primary carbon mass 1. Therefore, compared to when carbon materials of the same shape and size are used, it is possible to delay the timing at which the carbon materials 11 fall off from the secondary carbon mass 4 due to deterioration.

[0040] Furthermore, the larger the contact area of ​​the carbon material 11 with the iron casting 3, the more iron ions are eluted. In this regard, according to the above-described embodiment, the individual carbon materials 11 have irregular shapes with irregularities formed on their surfaces, which makes it possible to increase the amount of eluted iron ions. Furthermore, the irregularities on the surface make it easier for the carbon material 11 to adhere to the molten metal (iron melt).

[0041] <2. Modifications> The method for producing an iron ion eluting material and the iron ion eluting material according to the present invention are not limited to the above-described embodiment, and various modifications and improvements are possible within the scope of the claims.

[0042] For example, in the above-described embodiment, the second step S2 illustrates a case in which all of the multiple primary carbon lumps 1 produced in the first step S1 are fixedly arranged at intervals on the bottom surface, but this is not limited to this. Some of the multiple primary carbon lumps produced in the first step S1 may be freely arranged in the internal space 2S of the sand mold 2 without being fixed to the bottom surface. By freely arranging some of the carbon material 11, the working time for the second step S2 is reduced compared to when all of the carbon material 11 are fixedly arranged on the bottom surface.

[0043] Furthermore, in the above-described embodiment, an example was given of a case in which multiple carbon materials 11 having different shapes and sizes were used, but as long as the multiple carbon materials 11 are mixed randomly, they do not necessarily have to have different shapes and sizes. [Explanation of symbols]

[0044] 1 Primary carbon mass 2. Sand casting 2B Bottom 2S interior space 3. Iron castings 4 Secondary carbon mass 5. Iron ion elution body 11 Carbon material HG height SU1 surface WD width

Claims

1. A method for producing an iron ion eluate, comprising: a first step of producing a mixture of a plurality of carbon materials and an adhesive as a primary carbon mass; a second step of placing the primary carbon mass on the bottom surface of a sand mold by pressing it into place; a third step of pouring molten iron into the sand mold and forming the molten iron into the shape of the sand mold while replacing the adhesive of the primary carbon mass with the molten iron to produce a secondary carbon mass; a fourth step of cooling the molten iron poured into the sand mold to produce an iron casting containing the secondary carbon mass therein so that the portion of the secondary carbon mass pressed into the bottom surface protrudes from the surface; a fifth step of breaking the sand mold and removing the iron casting; A method for producing an iron ion eluate by the following steps.

2. In the first step, a plurality of primary carbon lumps are generated, The method for producing an iron ion elution body according to claim 1, characterized in that in the second step, at least some of the primary carbon lumps among the plurality of primary carbon lumps are pressed and arranged at a fixed interval against the bottom surface of the sand casting mold.

3. 3. The method for producing an iron ion eluting body according to claim 2, wherein in the second step, all of the plurality of primary carbon lumps are pressed onto the bottom surface at regular intervals.

4. The method for producing an iron ion elution body according to claim 2, characterized in that in the second step, some of the plurality of primary carbon lumps are freely placed inside the sand mold without being fixed to the bottom surface.

5. Among the plurality of carbon materials constituting the secondary carbon mass, one or more carbon materials present in the region protruding from the surface are exposed, 5. The method for producing an iron ion elution body according to claim 1, wherein carbon materials other than the one or more carbon materials are surrounded by the iron casting and are not exposed.

6. An iron ion eluent, Iron castings and a carbon mass formed by randomly mixing a plurality of carbon materials, the carbon mass being integrally formed with the iron casting inside the iron casting so that a portion of the carbon mass protrudes from the surface of the iron casting; Equipped with An iron ion eluting body characterized in that, among the multiple carbon materials constituting the carbon mass, one or more carbon materials present in an area protruding from the surface are partially exposed, and carbon materials other than the one or more carbon materials are surrounded by the iron casting and are not exposed.

7. 7. The iron ion eluting body according to claim 6, wherein the plurality of carbon materials constituting the carbon mass are different in shape or size from one another.

8. 8. The iron ion eluting body according to claim 6, wherein each of the plurality of carbon materials has an irregular shape with irregularities on the surface.

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