JP7441552B2 - Foaming inhibitor - Google Patents

Description

The present invention relates to a forming inhibitor used in a part of the steel manufacturing process.

In the above-mentioned technical field, Patent Document 1 discloses a technology related to a forming-suppressing molded body composed of a fiber aggregate to which combustible fibers are bonded and particles containing a metal hydroxide dispersed in the fiber aggregate. ing.

Patent No. 6281800

However, with the evolution of steel manufacturing technology, more effective forming inhibitors are being sought, and the techniques described in the above documents do not have a sufficient forming suppressing effect. An object of the present invention is to provide a technique for solving the above-mentioned problems.

In order to achieve the above object, the foaming inhibitor of the present invention is made of acrylic, nylon, polyester, polyethylene, which is a material obtained by pulverizing interior products, clothing products, medical hygiene products, automobile products, or civil engineering and construction products. , a fibrous organic material containing at least one of polyethylene terephthalate and polypropylene ;
a powdered inorganic material that is calcium carbonate, aluminum oxide, or silica or a mixture thereof ;
This is a foaming inhibitor obtained by mixing and compression molding the organic material while retaining the form of the organic material.

According to the present invention, a foaming inhibitor is provided in which an antifoaming component diffuses and reacts in a short period of time, and the overflow of slag can be sufficiently suppressed.

FIG. 1 is a diagram showing a model structure of a foaming inhibitor according to a first embodiment. It is a figure showing the model structure of a foaming inhibitor of a 2nd embodiment. FIG. 1 is a block diagram showing the configuration of a pulverizing and classifying system for tile carpet used in a method for producing a foaming inhibitor. It is a block diagram for explaining the detailed structure of a manufacturing system of a foaming inhibitor. 1 is an electrophotograph showing the microstructure of the foaming inhibitor produced in Example 1.

Exemplary embodiments of the invention are described in detail below. However, the configuration, numerical values, steps, processing flow, etc. described in the following embodiments are merely examples, and the technical scope of the present invention is not intended to be limited to only those descriptions. This will be explained in detail below.

[First embodiment]
FIG. 1 is a diagram showing a model structure of a foaming inhibitor 100 of this embodiment. As shown in FIG. 1, the foaming inhibitor 100 is formed by mixing a fibrous organic material 102 containing synthetic fibers 101 with a powdered inorganic material 103, and molding the mixture by non-melting compression while retaining the fiber form of the synthetic fibers 101. ing. This foaming inhibitor 100 is added to suppress the slag foaming phenomenon.

The synthetic fibers 101 form voids 104 between the plurality of synthetic fibers 101 by intertwining each other. That is, the foaming inhibitor 100 is a porous body having voids 104 formed between synthetic fibers 101.

Furthermore, particles of the powdered inorganic substance 103 are physically adsorbed on the surface of the synthetic fiber 101 . That is, the foaming inhibitor 100 includes a powdery inorganic substance 103 dispersed in a fibrous organic material 102 containing synthetic fibers 101.

The foaming inhibitor 100 is a mixture of a fibrous organic material 102 containing synthetic fibers 101 and a powdered inorganic material 103, and is molded by non-melting compression. Therefore, the foaming inhibitor 100 maintains the fiber form of the synthetic fibers 101 without melting the fibrous organic material 102 containing the synthetic fibers 101.

Since the foaming inhibitor 100 is a porous body having voids 104 formed between the synthetic fibers 101, it has a predetermined porosity and specific surface area. The porosity of the foaming inhibitor 100 is preferably 20 to 70%, as measured by the open porosity measurement method specified in JIS K 2249, for example.

It is preferable that the porosity of the foaming inhibitor 100 is 20% or more because the slag enters the inside of the foaming inhibitor 100 through the voids 104 of the foaming inhibitor 100, and thermal decomposition and combustion reactions proceed. On the other hand, it is preferable that the porosity of the foaming inhibitor 100 is 70% or less because the foaming inhibitor 100 has sufficient strength necessary for handling so that it is unlikely to be crushed during storage or transportation.

The content of the powdered inorganic substance 103 is preferably 30 to 90% by weight, particularly preferably 50 to 70% by weight, based on the entire weight of the foaming inhibitor 100. If the content of the powdered inorganic substance 103 is 90% by weight or less based on the entire weight of the foaming inhibitor 100, the specific gravity of the foaming inhibitor 100 can be adjusted to 1.5 to 2.5, and the generation This is preferable because it can penetrate through the slag that is On the other hand, it is preferable that the content of the powdered inorganic substance 103 is 30% by weight or more based on the entire weight of the foaming inhibitor 100, since black smoke generated by combustion decomposition of the fibrous organic material can be suppressed. .

Since the foaming inhibitor 100 contains the powdered inorganic substance 103, it has a specific gravity of 1.5 to 2.5. Therefore, when the foaming inhibitor 100 is added to the slag, it immediately starts settling without floating on the surface of the slag. The foaming inhibitor 100 that has started settling is separated into a fibrous organic material 102 and a powdery inorganic material 103 at a certain depth within the slag. The separated fibrous organic material 102 is burned within the slag.

On the other hand, the separated synthetic fibers 101 and the powdered inorganic substances 103 attached to the synthetic fibers 101 suppress the generation of bubbles in the slag due to carbon monoxide. When the synthetic fibers 101 are put into a converter or a slag pot, they are explosively gasified by combustion and decomposition, and the attached powdered inorganic substances 103 are widely diffused into the slag. Thereby, the foaming inhibitor 100 exhibits an excellent foaming inhibiting effect.

The form of the foaming inhibitor 100 is not particularly limited, and may be, for example, a cylindrical pellet, a polygonal column, or a polygon having an axial through hole.

As described above, according to the foaming inhibitor of the present embodiment, the antifoaming component is diffused over a wide range, and overflow of slag can be sufficiently suppressed.

[Second embodiment]
Compared to the above embodiments, the foaming inhibitor according to this embodiment uses industrial waste as a raw material as a fibrous organic material including synthetic fibers, and uses anhydrous metal oxides or metal carbonates as powdered inorganic materials. It differs in that it uses The other configurations and steps are the same as those of the above embodiment, so detailed explanation thereof will be omitted.

FIG. 2 is a diagram showing a model structure of the foaming inhibitor 200 of this embodiment. The foaming inhibitor 200 of the present embodiment is formed by mixing a powdery inorganic anhydride 203 with a fibrous organic material 202 containing synthetic fibers 201 derived from tile carpet, and molding the mixture by non-melting compression while retaining the fiber form. The foaming inhibitor 200 of this embodiment will be described below.

<Raw material for fibrous organic material>
The fibrous organic material 202 contained in the foaming inhibitor 200 is not particularly limited as long as it contains synthetic fibers 201, but examples include interior products, clothing products, medical hygiene products, automobiles, etc. Examples include materials made by pulverizing waste materials from industrial products or civil engineering and construction products.

Examples of interior products include, but are not limited to, tile carpets, roll carpets, carpets, curtains, and the like.

Examples of clothing products include, but are not limited to, clothing products made of elastomer, nylon, polyester, rayon, lyocell, spandex, acrylic fiber, and the like.

Medical hygiene products include, but are not particularly limited to, gauze, absorbent cotton, bandages, absorbable sutures, non-absorbable sutures, medical coverings (drapes), and medical gowns (surgical gowns). Examples include isolation gowns and patient clothing), non-woven fabric products, medical sheets, plaster bandages, medical splints, medical supports, wet tissues, adult disposable diapers, incontinence-related fabric products, and sterile packaging materials.

Examples of automotive products include, but are not limited to, floor mats, seat upholstery, vinyl leather seats, seat covers, seat sponges, airbags, and the like.

Products for civil engineering and construction include, but are not particularly limited to, slope protection sheets, thermal insulation materials for construction, wallpaper for construction, nonwoven fabrics for FRP, air conditioning filters, liquid filters, and the like.

<Synthetic fiber>
The synthetic fiber 201 is not particularly limited as long as it can adsorb the powdered inorganic anhydride 203 and can be completely combusted, but for example, fibers manufactured from the following synthetic resins can be used. can be mentioned.

Examples of resins that can be used to manufacture the synthetic fiber 201 include acrylic resin, nylon resin, polyester resin, polyethylene resin, polypropylene resin, polyurethane resin, polyester resin, polyester urethane resin, alkyd resin, butyral resin, acetal resin, polyamide resin, and styrene. - Acrylic resin, styrene resin, nitrocellulose, benzylcellulose, cellulose (tri)acetate, casein, shellac, gilsonite, gelatin, styrene - Maleic anhydride resin, polybutadiene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinylidene fluoride Resin, polyvinyl acetate resin, ethylene vinyl acetate resin, vinyl chloride/vinyl acetate copolymer resin, vinyl chloride/vinyl acetate/maleic acid copolymer resin, fluororesin, silicone resin, epoxy resin, phenoxy resin, phenol resin, Maleic acid resin, urea resin, melamine resin, benzoguanamine resin, ketone resin, petroleum resin, rosin, rosin ester, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, hydroxyethylcellulose, hydroxypropylcellulose, methylcellulose, ethylcellulose, hydroxyethylmethylcellulose, hydroxypropyl Examples include methylcellulose, carboxymethylcellulose, carboxymethylethylcellulose, carboxymethylnitrocellulose, ethylene/vinyl alcohol resin, and the like.

The fiber length of the synthetic fiber 201 is preferably 0.5 mm or more and 2.5 mm or less. When the fiber length of the synthetic fiber 201 is 0.5 mm or more, the fibers become entangled with each other, which is preferable in order to maintain the strength of the molded article. On the other hand, it is preferable that the fiber length of the synthetic fibers 201 is 2.5 mm or less because the synthetic fibers 201 can be easily diffused.

The fiber form of the synthetic fiber 201 is not particularly limited as long as it can adsorb powdered inorganic anhydride, and may be, for example, linear or bent. Moreover, the synthetic fiber 201 may be twisted in the fiber length direction. The cross-sectional shape of the synthetic fiber 201 may be circular, elliptical, triangular, square, or other polygonal.

<Powdered inorganic anhydride>
The powdered inorganic anhydride 203 is not particularly limited as long as it is a powdered inorganic anhydride that can react with the slag and make the specific gravity of the foaming inhibitor 200 1.5 to 2.5. Since the specific gravity of the fibrous organic material 202 including the synthetic fibers 201 is less than 1.5, the specific gravity of the powdered inorganic anhydride 203 is preferably 2.0 to 8.0. It is preferable that the specific gravity of the powdered inorganic anhydride 203 is 2.0 or more because the specific gravity of the foaming inhibitor 200 can be adjusted to 1.5 or more. If the specific gravity of the powdered inorganic anhydride 203 is 8.0 or less, the specific gravity of the foaming inhibitor 200 can be made 2.5 or less, which is preferable.

The molecules constituting the powdered inorganic anhydride 203 do not contain hydroxyl groups in the molecule and do not contain water of crystallization, so the powdered inorganic anhydride does not contain water even after being added to the slag. does not generate.

In this way, the foaming inhibitor 200 of this embodiment does not generate water, so the temperature within the slag does not drop and the efficiency of the foaming inhibiting effect does not decrease.

The particle size of the powdered inorganic anhydride 203 is preferably 10 μm or more and 500 μm or less. It is preferable that the particle size of the powdered inorganic anhydride is 10 μm or more because the particles of the powdered inorganic anhydride will not stick to each other. On the other hand, it is preferable that the particle size of the powdered inorganic anhydride is 500 μm or less, since the surface area of the powdered inorganic anhydride that reacts with the slag is increased and the reactivity is improved. Further, it is preferable that the particle size of the powdered inorganic anhydride 203 is 10 μm or more because the powdered inorganic anhydride 203 is easily dispersed in the voids between the synthetic fibers 201 . On the other hand, it is preferable that the particle size of the powdered inorganic anhydride 203 is 500 μm or less because the reactivity between the slag and the powdered inorganic anhydride 203 is improved.

The powdered inorganic anhydride 203 is a metal oxide or metal carbonate. Examples of metal oxides include, but are not limited to, aluminum oxide, calcium oxide, magnesium oxide, crystalline silica, amorphous silica, germanium oxide, tin oxide, lead oxide, gallium oxide, indium oxide, Examples include titanium oxide, zirconium oxide, hafnium oxide, iron oxide, sodium oxide, potassium oxide, and the like. In addition, the powdered inorganic anhydride 203 may be a metal nitride such as aluminum nitride, a metal hydroxide such as aluminum hydroxide or magnesium hydroxide, as long as the powdered inorganic anhydride 203 is mainly composed of a metal oxide or metal carbonate. It may include metal carbides such as silicon carbide, metal silicates such as calcium silicate, hydrated metal compounds, and combinations thereof.

Metal carbonates include, but are not particularly limited to, ammonium carbonate, potassium carbonate, calcium carbonate, aluminum carbonate, sodium carbonate, barium carbonate, magnesium carbonate, lithium carbonate, copper carbonate, iron carbonate, silver carbonate, Examples include calcium carbonate and magnesium carbonate. These metal carbonates release carbon dioxide and become metal oxides in the hot metal in the converter. Metal oxides are preferable because they have the function of reducing the basicity of the slag and improving the fluidity of the slag.

Among these gold oxides and metal carbonates, from the viewpoint of reactivity with hot metal and cost, the powdered inorganic anhydride 203 is preferably calcium carbonate, aluminum oxide, silica, or a mixture thereof.

<Non-melt compression>
The foaming inhibitor 200 is produced by kneading a fibrous organic material 202 containing synthetic fibers 201, a powdered inorganic anhydride 203, and water, and then subjecting the mixture to non-melt compression. Non-melt compression is performed at a temperature at which the fibrous organic material 202 does not melt. The temperature at which non-melting compression is performed is preferably 50 to 100°C. The pressure at which the non-melting compression is performed is such that the amount of water contained in the mixture of the fibrous organic material 202 containing the synthetic fibers 201, the powdered inorganic anhydride 203, and water is 1.0 to 3.0% by weight. It is sufficient if it is set within the possible range.

Non-melt compression is not particularly limited as long as it is a method that can compress and mold a mixture of a fibrous organic material 202 containing synthetic fibers 201, a powdered inorganic anhydride 203, and water. For example, extrusion molding, pressure molding, etc. can be mentioned. The non-melt compression method can be selected as appropriate depending on the materials of the fibrous organic material 202 containing the synthetic fibers 201 and the powdered inorganic anhydride 203 and the form of the foaming inhibitor 200 as a product. For example, extrusion molding is a molding process performed by applying pressure to a raw material and extruding it from a mold (die). Extrusion molding can make the cross-sectional area of the foaming suppressor 200 constant, and is therefore suitable for manufacturing the foaming suppressor 200 in a rod-like or pipe-like shape. In addition, in extrusion molding, it is necessary to keep the extrusion speed of the raw material at a constant speed in order to prevent the forming inhibitor 200 from bending or breaking during extrusion molding. Note that in order to improve the productivity of the foaming inhibitor by non-melt compression, it is necessary to increase the extrusion speed.

In this way, the foaming inhibitor of the present embodiment is a mixture of a fibrous organic material containing synthetic fibers and a powdered inorganic anhydride, and is molded by non-melting compression. Therefore, the foaming inhibitor of the present embodiment is molded while leaving the fiber form of the fibrous organic material containing synthetic fiber intact. Therefore, in the foaming inhibitor of the present embodiment, the antifoaming component diffuses over a wide range, so it is possible to suppress the generation of bubbles and effectively suppress the overflow of slag.

[Third embodiment]
The foaming inhibitor according to the present embodiment is different from the above embodiments in that a fibrous organic material derived from tile carpet is used as the fibrous organic material, and calcium carbonate is used in combination as the powdered inorganic anhydride. It's different. The other configurations are the same as those of the above embodiment, so detailed explanation thereof will be omitted.

<Raw material for fibrous organic material>
The foaming inhibitor of this embodiment uses waste carpet tiles as a raw material for the fibrous organic material. In urban areas lined with office buildings, large quantities of carpet tiles are consumed, and the used carpet tiles are simply discarded as waste material. Since the foaming inhibitor of this embodiment reuses waste carpet tiles, it has extremely great technical significance from the viewpoint of effective utilization of resources.

<Synthetic fiber>
The foaming inhibitor of this embodiment is made from carpet tile waste. The pile part of carpet tiles is made of synthetic fibers. Synthetic fibers are not particularly limited as long as they are manufactured from synthetic resins made from petroleum, but include acrylic, nylon, polyester, polyethylene, polyethylene terephthalate (PET), and polypropylene. Can be done.

<Calcium carbonate>
Calcium carbonate contained in the foaming inhibitor of this embodiment is a highly versatile inorganic material, easy to handle, and inexpensive, so it can be most preferably used. The calcium carbonate may be heavy calcium carbonate obtained by crushing and classifying limestone, or light calcium carbonate obtained by precipitating fine crystals in a liquid through a chemical reaction.

The particle size of calcium carbonate is preferably 10 μm or more and 200 μm or less. It is preferable that the particle size of calcium carbonate is 10 μm or more because the particles of calcium carbonate do not stick to each other. On the other hand, it is preferable that the particle size of calcium carbonate is 200 μm or less, since the surface area of calcium carbonate that reacts with the slag is increased and the reactivity is improved.

Calcium carbonate contained in the foaming inhibitor of this embodiment is thermally decomposed into calcium oxide and carbon dioxide within the slag. The carbon dioxide generated from the calcium carbonate destroys the bubbles forming within the slag. Furthermore, thermal decomposition of calcium carbonate is an endothermic reaction. Therefore, calcium carbonate exhibits a foaming suppressing effect by removing the heat generated within the slag.

[Fourth embodiment]
This embodiment is a method for producing the foaming inhibitor of the first to third embodiments. The foaming inhibitor is formed by mixing a fibrous organic material and a powdered inorganic anhydride and then non-melting compression. Hereinafter, the method for producing the foaming inhibitor of the present embodiment will be explained separately into a step of producing a fibrous organic material and a step of mixing the fibrous organic material and the powdered inorganic anhydride and then non-melting compression. do.

<Process of manufacturing fibrous organic material>
FIG. 3 is a block diagram showing the configuration of a tile carpet crushing and classification system 300 used in the method for producing a foaming inhibitor according to the present embodiment. The fibrous organic material containing synthetic fibers contained in the foaming inhibitors of the first to third embodiments is produced, for example, by pulverizing waste materials from carpet tiles, which are interior products.

As shown in FIG. 3, a tile carpet crushing and classification system 300 used in the method for producing a foaming inhibitor according to the present embodiment crushes and classifies tile carpet to form fibrous materials containing synthetic fibers contained in the foaming inhibitor. This is a system for producing organic materials.

As shown in FIG. 3, the tile carpet crushing and classification system 300 includes a coarse crusher 301, a fine crusher 302, and a classifier 303.

The coarse crusher 301 converts the tile carpet 350, which includes a synthetic fiber portion 351 covering the front surface and a resin plate portion 352 supporting the synthetic fiber portion 351 on the back surface, into tile carpet pieces 311 of a first size. Smash.

The fine crusher 302 crushes the first size tile carpet piece 311 crushed by the coarse crusher 301 into powder 321 of a second size smaller than the first size.

The classifier 303 places the second size powder 321 on a mesh member 331 and applies vibration to separate it into powder 332 originating from the synthetic fiber portion and powder 333 originating from the plate portion. The classifier 303 sucks powder 332 originating from the synthetic fiber portion. In this way, the powder 332 derived from the synthetic fiber portion obtained by the classifier 303 can be made into a fibrous organic material containing synthetic fibers. In addition, in the manufacturing method of the foaming inhibitor of this embodiment, a tile carpet crushing and classification system equipped with one classifier is adopted, but the system is not limited to this, and a system equipped with a plurality of classifiers is used. A tile carpet crushing and classification system may be adopted.

In this way, the tile carpet crushing and classification system 300 used in the method for producing a foaming inhibitor of the present embodiment efficiently and highly accurately produces the fibrous organic material containing synthetic fibers contained in the foaming inhibitor. be able to. The powder 342 derived from the manufactured synthetic fiber part is transferred to a fiber storage tank 401 equipped with a screw feeder of a forming inhibitor manufacturing system 400.

<Process of non-melting compression>
FIG. 4 is a block diagram for explaining the detailed configuration of the foaming inhibitor manufacturing system 400. The fiber storage tank 401 stores fibrous organic materials including synthetic fibers transferred from the carpet tile crushing and classification system. The inorganic storage tank 402 stores powdered inorganic anhydride.

The fibrous organic material stored in the fiber storage tank 401 with a screw feeder is fed by a bucket-type conveyor 403 into a mixer 405 with a weighing machine. The powdered inorganic anhydride stored in the inorganic storage tank 402 with a screw feeder is fed by a bucket-type conveyor 404 to a mixing mixer 405 with a weighing device. The mixing mixer 405 with a weighing device measures the weight of the fibrous organic material introduced by the bucket-type conveyor 403 . The mixing mixer 405 with a weighing device measures the weight of the powdered inorganic anhydride introduced by the bucket-type conveyor 404 .

In this way, the mixing mixer 405 with a measuring device adjusts the weight ratio of the fibrous organic material containing synthetic fibers and the powdered inorganic anhydride that constitute the foaming inhibitor. A mixer with a meter 405 produces a mixture before being non-melted and compressed. The manufactured mixture is stored in a mixture storage tank 406 with a screw feeder.

The mixture stored in mixture storage tank 406 is divided into approximately two equal parts. The mixture divided into two equal parts is conveyed to a granulator 408 by a bucket-type conveyor 407. Another mixture divided into two equal parts is conveyed to a granulator 410 by a bucket-type conveyor 409.

The granulator 408 granulates a mixture of a fibrous organic material containing synthetic fibers and a powdered inorganic anhydride conveyed from the bucket conveyor 407 to produce a granular foaming inhibitor. Granulation may be performed by adding water to a mixture of a fibrous organic material containing synthetic fibers and a powdered inorganic anhydride. It is preferable to add water to the mixture because it facilitates granulation. When water is added to the mixture, the proportion of water is preferably 5 to 20% based on the total weight of the mixture and water.

The temperature at which the mixture of a fibrous organic material containing synthetic fibers and a powdered inorganic anhydride is non-melt compressed is preferably 100° C. or lower. It is preferable that the temperature during non-melting compression is 100° C. or lower because the fibrous organic material containing synthetic fibers will not melt.

The granulator 410 performs non-melting compression similarly to the granulator 408 to produce a granular foaming inhibitor. The foaming inhibitor having a predetermined size and shape produced by the granulator 408 and the granulator 410 is conveyed by a belt-type product conveyor and sieved by a sieve machine 412 . The form of the foaming inhibitor is made uniform by the sieving machine 412, and the product is shipped as a product.

The form of the foaming inhibitor thus produced is not particularly limited, but may be, for example, in the form of pellets with a diameter of 5 to 20 mm. It is preferable that the foaming inhibitor is in the form of pellets because it has excellent handling properties, is easy to pack into bags, and is also excellent in handling during use.

As described above, according to the present embodiment, the foaming inhibitor can be manufactured even more efficiently and with high precision.

[Other embodiments]
Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. The configuration and details of the present invention can be modified in various ways that can be understood by those skilled in the art within the scope of the present invention. Furthermore, compositions in which the separate features included in each embodiment are combined in any manner are also included within the scope of the present invention.

<Example>
Examples of the present invention will be described below. However, the present invention is not limited to this example. Foaming inhibitors of Examples 1 to 5 and Comparative Examples 1 to 2 below were produced, and the foaming inhibitory effect of the foaming inhibitors was evaluated by observing the degree of swelling of the slag during dephosphorization refining in the refining process.

<Production of foaming inhibitor>
(Example 1)
Discarded carpet tiles were used as the raw material for the fibrous organic material. The above tile carpet waste material (collected by Refinverse Co., Ltd.) was coarsely pulverized and then finely pulverized to produce a fibrous organic material. Calcium carbonate was used as the powdered inorganic anhydride. 100 kg of a fibrous organic material, 100 kg of calcium carbonate, which is a powdered inorganic anhydride, and 20 kg of water were mixed using a mixer equipped with a measuring device, and then sufficiently stirred. A mixture of the fibrous organic material and calcium carbonate that had been thoroughly stirred was extruded using a granulator through a die with a diameter of 10 mm by non-melting compression to obtain the foaming inhibitor of Example 1.

It was confirmed using an electron microscope whether the foaming inhibitor produced in Example 1 contained fibers. The cross-sectional structure of the foaming inhibitor produced in Example 1 is shown in FIG. FIG. 5 is an electrophotograph showing the microstructure of the foaming inhibitor produced in Example 1.

(Examples 2 to 5)
A foaming inhibitor was produced in the same manner as in Example 1, except that the raw material of the fibrous organic material, the powdered inorganic anhydride, and the extrusion molding conditions were changed.

(Comparative Examples 1-2)
A foaming inhibitor of Comparative Example 1 was produced by extrusion molding using non-melt compression using only a fibrous organic material. In addition, a foaming inhibitor of Comparative Example 2 was produced by performing extrusion molding by non-melting compression using only a powdered inorganic anhydride. Table 1 shows the compositions of the foaming inhibitors produced in Examples 1 to 5 and Comparative Examples 1 to 2, the diameter of the die used to produce the foaming inhibitors, and the presence or absence of fiber morphology.

(Evaluation of foaming inhibitor)
The foaming inhibitors produced in Examples 1 to 5 and Comparative Examples 1 to 2 were evaluated. The foaming inhibitor was evaluated by measuring the degree of foaming during dephosphorization in the refining process.

Specifically, the foaming inhibitor was evaluated according to the following procedure. The forming inhibitor produced in Examples 1 to 5 and Comparative Examples 1 to 2 was added to the hot metal in the converter from the top of the converter to the inside of the converter at a rate of about 15 to 20 kg/ton (forming inhibitor/hot metal). I put it in.

After about 60 seconds had elapsed after the foaming inhibitor was introduced into the converter, the degree of swelling of the slag in the converter was visually evaluated. The composition of the hot metal in the converter is C: 4.5% or more, Si: 0.35-0.4%, P: 0.11-0.13%, and the hot metal temperature is 1300-1400℃. there were.

The degree of swelling of the overflowing slag was visually evaluated as follows.

``Slag swells large'': A large amount of slag swells from the top of the converter, and the refining process must be stopped. ``Slag swells moderately'': Slag swells from the top of the converter. "No slag swelling": When no swelling of slag is observed from the top of the converter during dephosphorization refining for each 10 heats. The foaming suppressing effect of the foaming agent was evaluated based on the degree of swelling. The results are shown in Table 2. Note that the evaluation criteria for the forming suppression effect are as follows.

◎: Excellent foaming suppression effect (no slag swelling)
○: Forming suppression effect (medium slag swelling)
×: Forming suppression effect is not sufficient (large slag swelling)

As is clear from FIG. 5, it was found that the foaming inhibitor produced in Example 1 was molded while maintaining its fiber form. Furthermore, as is clear from the comparison between Examples 1 to 5 and Comparative Examples 1 to 2, fibrous organic materials including synthetic fibers and powdered inorganic anhydrides are mixed and the fiber morphology is formed by non-melting compression. By molding while leaving the slag, it is possible to provide a foaming inhibitor that can suppress the amount of slag overflowing.

Claims (12)

A fiber containing at least one of acrylic, nylon, polyester, polyethylene, polyethylene terephthalate, and polypropylene, which is a material obtained by pulverizing interior products, clothing products, medical hygiene products, automobile products, or civil engineering and construction products. a shaped organic material;
a powdered inorganic material that is calcium carbonate, aluminum oxide, or silica or a mixture thereof ;
A foaming inhibitor obtained by mixing and compression molding the fibrous organic material while retaining its form. The foaming inhibitor according to claim 1, wherein the fibrous organic material is a porous body having voids between the plurality of synthetic fibers due to mutual entanglement. The foaming inhibitor according to claim 1 , wherein the powdery inorganic particles are physically adsorbed on the surface of the fibrous organic material . The foaming inhibitor according to claim 1 , which has a porosity of 20 to 70% as measured by the method for measuring open porosity specified in JIS K 2249 . The foaming inhibitor according to claim 1, wherein the content of the powdered inorganic substance is 30 to 90% by weight based on the entire weight of the foaming inhibitor 100. The foaming inhibitor according to claim 1, having a specific gravity of 1.5 to 2.5. The foaming inhibitor according to claim 1, which is a polygonal body having an axial through hole. The foaming inhibitor according to claim 1, wherein the fiber length of the fibrous organic material is 0.5 mm or more and 2.5 mm or less. The foaming inhibitor according to claim 1, wherein the powdery inorganic material has a specific gravity of 2.0 to 8.0. The foaming inhibitor according to claim 1, wherein the powdered inorganic substance is a powdered inorganic anhydride and does not contain a hydroxyl group in its molecule and does not contain crystal water. The foaming inhibitor according to claim 1, wherein the powdery inorganic substance has a particle size of 10 μm or more and 500 μm or less. The foaming inhibitor according to claim 1, wherein the fibrous organic material is a waste material of carpet tiles.

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