JP7820095B2 - Blocks for recycling rock wool waste and recycling method - Google Patents
Blocks for recycling rock wool waste and recycling methodInfo
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- JP7820095B2 JP7820095B2 JP2021062338A JP2021062338A JP7820095B2 JP 7820095 B2 JP7820095 B2 JP 7820095B2 JP 2021062338 A JP2021062338 A JP 2021062338A JP 2021062338 A JP2021062338 A JP 2021062338A JP 7820095 B2 JP7820095 B2 JP 7820095B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Description
本発明は、ロックウール廃材の再生用ブロックに関する。特に、ロックウール廃材を再生するために溶融炉に投入するためのブロックに関する。また、本発明は、ロックウール廃材の再生方法に関する。 The present invention relates to a block for recycling waste rock wool. In particular, it relates to a block for feeding into a melting furnace to recycle waste rock wool. The present invention also relates to a method for recycling waste rock wool.
耐火性、防火性、吸音性および／または断熱性などを付与する目的で、構造物表面にロックウール等の鉱物繊維を用いた繊維層を設けることが広く行われている。ロックールは、溶融炉で溶融された岩石や高炉スラグ等を主体とする材料が、急冷されながら、繊維化された素材（鉱物繊維）である。繊維化するときに、一部が繊維化が不充分なもの（一部又は全部が粒状のもの、粉状のもの及び折れて短い繊維のものを含み、以下同じ。）となり、製品として使用することができない。また、原材料を溶融するときに、原材料の一部が排ガスとともにダストとして排出され集塵機で集塵される。これらのロックール製造時に発生する廃材は、一部はセメント製造時の原料として利用されるが、産業廃棄物として処分されている。 It is common to apply a fiber layer made of mineral fibers such as rock wool to the surface of a structure to impart fire resistance, fire prevention, sound absorption, and/or thermal insulation. Rock wool is a material (mineral fiber) made by rapidly cooling materials, primarily consisting of rock or blast furnace slag, melted in a melting furnace. During fiberization, some of the material is insufficiently fiberized (including partially or completely granular, powdery, or broken, short fibers; the same applies below), making it unusable as a product. Furthermore, when the raw materials are melted, some of the raw materials are emitted as dust along with the exhaust gas and collected in a dust collector. Some of the waste material generated during the production of rock wool is used as a raw material in cement production, but is disposed of as industrial waste.
ロックウールに樹脂を添加し板，ブロック又はマット状に成形したロックウール成形品は、成形時に所定の長さや幅等に切断する工程で、切削屑が廃材として出てくる。また、ロックウールを用いた建設現場、並びに、ロックウールを用いている建築物や構造物の解体等でもロックウールを主成分とする廃材が出てくる。これらの廃材も業廃棄物として処分されている。 Rock wool products are made by adding resin to rock wool and forming it into plates, blocks, or mats. When cutting the product to the specified length and width during the molding process, cutting chips are generated as waste. Furthermore, waste materials primarily composed of rock wool are generated at construction sites where rock wool is used, as well as during the demolition of buildings and structures that use rock wool. These waste materials are also disposed of as industrial waste.
ロックール等の鉱物繊維を主成分とする廃材を解砕し又はそのまま溶融炉に投入し溶融し、再度繊維化して再利用する技術が開示されている（例えば特許文献１及び２参照。）。 Techniques have been disclosed in which waste materials mainly composed of mineral fibers such as rock coke are crushed or directly put into a melting furnace to be melted, and then re-fibrillated for reuse (see, for example, Patent Documents 1 and 2) .
ロックウール廃材として製造時の繊維化が不充分なものや集塵機で集塵されたダストを用いる場合は、廃材を解砕し又はそのまま溶融炉に投入し溶融し、再度繊維化して再利用する技術で再繊維化しようとしても、ダストとして排ガスとともに炉から排出されてしまう虞があり、また、燃焼ガスや燃焼用空気若しくは酸素が通る原材料又は原燃料の隙間を詰まらせてしまい継続して再繊維化でない虞がある。 When using rock wool waste that was insufficiently fiberized during production or dust collected by a dust collector, even if attempts are made to re-fiberize the waste by crushing it or putting it directly into a melting furnace to melt it and then fiberizing it again for reuse, there is a risk that it will be discharged from the furnace as dust along with the exhaust gas, and there is also a risk that it will clog the gaps in the raw materials or raw fuel through which combustion gas, combustion air, or oxygen pass, preventing continued re-fiberization .
本発明は、ロックウール製造時の繊維化が不充分なものからなるロックウール廃材や集塵機で集塵されたダストからなるロックウール廃材であっても、ロックウール製造時の原料として溶融炉に投入できるロックウール廃材の再生技術（再生用ブロック及び再生方法）を提供することを目的とする。本発明は、含水率が小さく且つ圧縮強度の高いロックウール廃材の再生用ブロックを提供することを目的とする。即ち、本発明は、含水率が０．５％以下と小さく且つ圧縮強度が１．０Ｎ／mm2以上であるロックウール廃材の再生用ブロックを提供することを目的とする。また、本発明は、ロックウール廃材を多く且つ継続的にロックウールに再生することのできるロックウール廃材の再生方法を提供することを目的とする。 The present invention aims to provide a technology (regeneration block and regeneration method) for recycling rock wool waste that can be input into a melting furnace as a raw material during rock wool production, even if the waste rock wool is insufficiently fiberized during rock wool production or is composed of dust collected by a dust collector. The present invention also aims to provide a block for recycling rock wool waste that has a low moisture content and high compressive strength. Specifically, the present invention aims to provide a block for recycling rock wool waste that has a moisture content of 0.5% or less and a compressive strength of 1.0 N/ mm2 or more. Another aim of the present invention is to provide a method for recycling rock wool waste that can continuously regenerate a large amount of rock wool waste into rock wool.
本発明者は、前記課題解決のため鋭意検討した結果、特定の軽装嵩密度のロックウール廃材と、特定割合のセメントと水とを含有するブロックとすることで上記課題を解決できることを見出し、本発明を完成させた。即ち、本発明は、以下の（１）で表すロックウール廃材の再生用ブロック及び（２）で表すロックウール廃材の再生方法である。
（１）軽装嵩密度が０．４ｇ／cm3以上であるロックウール廃材と、含まれる固形分１００質量部に対しセメント５～３０質量部であるロックウール廃材と、含まれる固形分１００質量部に対し１９～３５質量部の水を含有することを特徴とし、前記軽装嵩密度が、容積（Ｖ）の分かっている容器に静かにロックウール廃材を投入し、タッピング等の振動を当該容器に加えずに、容器の上端より盛り上がっている部分のロックウール廃材を擦りきり（落とし）、容器の上端までロックウール廃材が入っているときの質量（Ｍ１）を測定し、空の状態の容器の質量（Ｍ０）より、次式（１）により求めた軽装嵩密度ρであるロックウール廃材を再生するためにロックウール製造時の原料として溶融炉に投入するためのブロックである再生用ブロック。
ρ＝（Ｍ１－Ｍ０）÷Ｖ ・・・・・（１）
（２）上記（１）のロックウール廃材の再生用ブロックを、溶融炉に投入し溶融させた溶融物を繊維化させることを特徴とするロックウール廃材の再生方法。
As a result of intensive research into solving the above problems, the inventors have found that the above problems can be solved by forming a block containing rock wool waste with a specific light bulk density and specific proportions of cement and water, and have completed the present invention. That is, the present invention is a block for recycling rock wool waste represented by (1) below and a method for recycling rock wool waste represented by (2) .
(1) A regeneration block characterized by containing rock wool waste having a loose bulk density of 0.4 g/cm 3 or more, rock wool waste having 5 to 30 parts by mass of cement per 100 parts by mass of solids contained therein, and 19 to 35 parts by mass of water per 100 parts by mass of solids contained therein, wherein the loose bulk density is determined by gently placing the rock wool waste in a container whose volume (V) is known, scraping off (dropping) the part of the rock wool waste that protrudes above the top of the container without applying vibration such as tapping to the container, measuring the mass (M 1 ) when the rock wool waste is filled up to the top of the container, and using the mass (M 0 ) of the empty container, calculating the loose bulk density ρ using the following formula (1): A regeneration block is a block to be put into a melting furnace as a raw material for rock wool production to regenerate the rock wool waste.
ρ=(M 1 - M 0 )÷V (1)
(2) A method for recycling waste rock wool, characterized in that the blocks for recycling waste rock wool of (1) above are put into a melting furnace, and the molten material is then fiberized .
本発明によれば、ロックウール製造時の繊維化が不充分なものからなるロックウール廃材や集塵機で集塵されたダストからなるロックウール廃材であっても、ロックウール製造時の原料として溶融炉に投入できるロックウール廃材の再生技術（再生用ブロック及び再生方法）が得られる。また、本発明によれば、含水率が小さく且つ圧縮強度の高いロックウール廃材の再生用ブロック、即ち、含水率が０．５％以下と小さく且つ圧縮強度が１．０Ｎ／mm2以上であるロックウール廃材の再生用ブロックが得られる。また、本発明によれば、ロックウール廃材を多く且つ継続的にロックウールに再生することのできるロックウール廃材の再生方法が得られる。 According to the present invention, a regeneration technology (regeneration block and regeneration method) for waste rock wool can be obtained that can be input into a melting furnace as a raw material for rock wool production, even if the waste rock wool is insufficiently fiberized during rock wool production or is composed of dust collected by a dust collector. Furthermore, according to the present invention, a regeneration block for waste rock wool having a low moisture content and high compressive strength, i.e., a regeneration block for waste rock wool having a moisture content of 0.5% or less and a compressive strength of 1.0 N/ mm2 or more, can be obtained. Furthermore, according to the present invention, a regeneration method for waste rock wool can be obtained that can continuously regenerate a large amount of waste rock wool into rock wool.
本発明のロックウール廃材の再生用ブロックは、軽装嵩密度が０．２５ｇ／cm3以上であるロックウール廃材と、含まれる固形分１００質量部に対し１０～３０質量部のセメントと、含まれる固形分１００質量部に対し１５～６０質量部の水を含有する、又は、軽装嵩密度が０．３ｇ／cm3以上であるロックウール廃材と、含まれる固形分１００質量部に対しセメント５～３０質量部であるロックウール廃材と、含まれる固形分１００質量部に対し１５～６０質量部の水を含有することを特徴とする。これにより、再生用ブロックの含水率を０．５質量％以下且つ圧縮強度を１．０Ｎ／mm2以上となる。圧縮強度が１．０Ｎ／mm2以上あると、溶融炉への再生用ブロックの投入時に、当該再生ブロックが崩れてしまう可能性が低い。また、再生用ブロックの含水率が０．５質量％以下であると、含まれる水分が気化する時に奪われる熱量が少なくて済む。 The rock wool waste reclamation block of the present invention is characterized by containing rock wool waste having a loose bulk density of 0.25 g/cm or more , 10 to 30 parts by weight of cement per 100 parts by weight of solids, and 15 to 60 parts by weight of water per 100 parts by weight of solids, or containing rock wool waste having a loose bulk density of 0.3 g/cm or more, 5 to 30 parts by weight of cement per 100 parts by weight of solids, and 15 to 60 parts by weight of water per 100 parts by weight of solids. This results in a moisture content of the reclamation block of 0.5% by weight or less and a compressive strength of 1.0 N/mm or more . A compressive strength of 1.0 N/mm or more reduces the likelihood of the reclamation block crumbling when introduced into a melting furnace. Furthermore, a moisture content of 0.5% by weight or less reduces the amount of heat lost when the moisture vaporizes.
本発明に使用するセメントとしては、水硬性セメントであればよく、例えば普通、早強、超早強、低熱及び中庸熱の各種ポルトランドセメント、白色セメント、エコセメント、並びにこれらのポルトランドセメント、白色セメント又はエコセメントに、フライアッシュ、高炉スラグ、シリカフューム又は石灰石微粉末等を混合した各種混合セメントが挙げられ、これらを二種以上併用してもよい。 The cement used in the present invention may be any hydraulic cement, such as various types of Portland cement (normal, early-strength, extra-early-strength, low-heat, and medium-heat), white cement, ecocement, and various blended cements obtained by mixing fly ash, blast furnace slag, silica fume, limestone powder, or the like with Portland cement, white cement, or ecocement; two or more of these may also be used in combination.
本発明におけるセメントの含有割合は、本発明の再生用ブロックに含まれる固形分１００質量部に対する質量部で表している。本発明において、セメントの含有割合が、再生用ブロックに含まれる固形分１００質量部に対し３０質量部を超えると、再生用ブロックの化学組成のうち、ＣａＯの含有率が高くなり且つＳｉＯ２の含有率が低くなるため、溶融炉に多く投入できない、つまり、セメントの含有割合が再生用ブロックに含まれる固形分１００質量部に対し３０質量部を超えた再生用ブロックを、通常のロックウール製造時の原材料（ＣａＯ、Ａｌ２Ｏ３、ＳｉＯ２を主要な化学組成とする原材料）に対する割合を大きくすると、原材料の化学組成が許容範囲を超えて変わってしまうため、通常のロックウール製造時の原材料に対する割合を大きくすることができない。 The cement content in the present invention is expressed in parts by mass relative to 100 parts by mass of the solids contained in the reclamation block of the present invention. In the present invention, if the cement content exceeds 30 parts by mass relative to 100 parts by mass of the solids contained in the reclamation block, the CaO content in the chemical composition of the reclamation block will be high and the SiO2 content will be low, so it will not be possible to add a large amount to the melting furnace. In other words, if a reclamation block with a cement content exceeding 30 parts by mass relative to 100 parts by mass of the solids contained in the reclamation block is increased in proportion to the raw materials used in normal rock wool production (raw materials whose main chemical composition is CaO, Al2O3 , and SiO2 ), the chemical composition of the raw materials will change beyond the allowable range, so it will not be possible to increase the proportion of the raw materials used in normal rock wool production.
本発明における水量は、本発明の再生用ブロックに含まれる固形分１００質量部に対し１５～６０質量部とする。６０質量部を超えると含水率が大きく且つ圧縮強度が不足する。１５質量部未満でも、圧縮強度が不足する。本発明における水量は、含水率及び圧縮強度の点で、好ましくは、本発明の再生用ブロックに含まれる固形分１００質量部に対し１９～５０質量部とし、更に好ましくは１９～３５質量部とする。 The amount of water in this invention is 15 to 60 parts by mass per 100 parts by mass of solids contained in the recycling block of the invention. If it exceeds 60 parts by mass, the water content will be high and the compressive strength will be insufficient. If it is less than 15 parts by mass, the compressive strength will also be insufficient. In terms of water content and compressive strength, the amount of water in this invention is preferably 19 to 50 parts by mass, and more preferably 19 to 35 parts by mass, per 100 parts by mass of solids contained in the recycling block of the invention.
本発明における軽装嵩密度ρは、容積（Ｖ）の分かっている容器に静かにロックウール廃材を投入し、タッピング等の振動を当該容器に加えずに、容器の上端より盛り上がっている部分のロックウール廃材を擦りきり（落とし）、容器の上端までロックウール廃材が入っているときの質量（Ｍ１）を測定し、空の状態の容器の質量（Ｍ０）より、次式（１）により求めた嵩密度をいう。
ρ＝（Ｍ１－Ｍ０）÷Ｖ ・・・・・（１）
In the present invention, the loose bulk density ρ refers to the bulk density calculated by the following formula (1) when rock wool waste is gently placed in a container of known volume (V), and without applying any vibration such as tapping to the container, the rock wool waste that protrudes above the top of the container is scraped off (dropped off), and the mass (M 1 ) of the container when the rock wool waste is filled up to the top of the container is measured, and the mass (M 0 ) of the empty container is used to calculate the bulk density.
ρ=(M 1 - M 0 )÷V (1)
本発明におけるロックウールとは、溶融炉で溶融された岩石や高炉スラグ等を主体とする材料が、急冷されながら、繊維化された素材（鉱物繊維）であり、例えば、高炉スラグを主体とする材料より製造されたスラグウールなども含まれる。 In this invention, rock wool refers to a material (mineral fiber) made by rapidly cooling a material primarily composed of rock or blast furnace slag melted in a melting furnace and then fibrous. It also includes, for example, slag wool made from a material primarily composed of blast furnace slag.
本発明に使用するロックウール廃材としては、ロックウール製造時の繊維化が不充分なものからなるロックウール廃材、ロックウール製造時の集塵機で集塵されたダストからなるロックウール廃材、ロックウール成形品の成形時に所定の長さや幅等に切断する工程で出てくる切削屑、ロックウールを用いた建設現場で出てくるロックウール廃材、ロックウールを用いている建築物や構造物の解体等排出されるロックウールを主成分とする廃材が挙げられる。本発明に使用するロックウール廃材としては、再生時の成分調整を行い易いことから、ロックウール製造時の繊維化が不充分なものからなるロックウール廃材、ロックウール製造時の集塵機で集塵されたダストからなるロックウール廃材、ロックウール成形品の成形時に所定の長さや幅等に切断する工程で出てくる切削屑から選ばれる１種又は２種以上が好ましい。また、本発明に使用するロックウール廃材が粉状、粒状又は短繊維状ではない場合は、粉砕又は解砕して使用することが好ましい。尚、本発明に使用するロックウール廃材が粉状、粒状又は短繊維状の場合も、粉砕又は解砕して使用してもよい。 Examples of waste rock wool used in this invention include waste rock wool that is insufficiently fiberized during rock wool production, waste rock wool consisting of dust collected by a dust collector during rock wool production, shavings generated during the cutting process to specified lengths and widths during the formation of rock wool molded products, waste rock wool generated at construction sites using rock wool, and waste rock wool-based materials discarded during the demolition of buildings and structures that use rock wool. The waste rock wool used in this invention is preferably one or more of the following, because it facilitates component adjustment during regeneration: waste rock wool that is insufficiently fiberized during rock wool production, waste rock wool consisting of dust collected by a dust collector during rock wool production, and shavings generated during the cutting process to specified lengths and widths during the formation of rock wool molded products. Furthermore, if the waste rock wool used in this invention is not in powder, granular, or short fiber form, it is preferably crushed or disintegrated before use. Even if the waste rock wool used in this invention is in powder, granular, or short fiber form, it may be crushed or disintegrated before use.
本発明は、好ましくは、軽装嵩密度が０．２５ｇ／cm3以上であるロックウール廃材と、含まれる固形分１００質量部に対し１５～３０質量部のセメントと、含まれる固形分１００質量部に対し１５～５０質量部の水を含有する、又は
軽装嵩密度が０．３ｇ／cm3以上であるロックウール廃材と、含まれる固形分１００質量部に対しセメント１０～３０質量部であるロックウール廃材と、含まれる固形分１００質量部に対し１５～３５質量部の水を含有するることを特徴とするロックウール廃材の再生用ブロックである。これにより、含水率が０．５％以下且つ圧縮強度が２．０Ｎ／mm2以上のロックウール廃材の再生用ブロックが得られる。
The present invention is preferably a block for recycling waste rock wool, characterized by containing waste rock wool having a loose bulk density of 0.25 g/cm or more , 15 to 30 parts by mass of cement per 100 parts by mass of solids, and 15 to 50 parts by mass of water per 100 parts by mass of solids, or waste rock wool having a loose bulk density of 0.3 g/cm or more, 10 to 30 parts by mass of cement per 100 parts by mass of solids, and 15 to 35 parts by mass of water per 100 parts by mass of solids. This results in a block for recycling waste rock wool having a moisture content of 0.5% or less and a compressive strength of 2.0 N/mm or more .
本発明は、より好ましくは、軽装嵩密度が０．４ｇ／cm3以上であるロックウール廃材と、含まれる固形分１００質量部に対しセメント５～３０質量部であるロックウール廃材と、含まれる固形分１００質量部に対し１９～３５質量部の水を含有するることを特徴とするロックウール廃材の再生用ブロックである。これにより、含水率が０．２５％以下且つ圧縮強度が１．０Ｎ／mm2以上のロックウール廃材の再生用ブロックが得られる。 More preferably, the present invention relates to a block for recycling waste rock wool, which contains waste rock wool having a light bulk density of 0.4 g/cm or more , waste rock wool containing 5 to 30 parts by mass of cement per 100 parts by mass of solids, and 19 to 35 parts by mass of water per 100 parts by mass of solids. This results in a block for recycling waste rock wool having a moisture content of 0.25% or less and a compressive strength of 1.0 N/mm or more .
本発明の再生用ブロックには、本発明の効果を実施損なわない範囲で、セメント、ロックウール廃材及び水以外に、混和材料を１種又は２種以上を用いることができる。この混和材料としては、例えば、セメント用ポリマー、増粘剤、セメント分散剤、膨張材、防水材、防錆剤、収縮低減剤、顔料、ロックウール以外の繊維、撥水剤、白華防止剤、急結剤（材）、急硬剤（材）、凝結遅延剤、発泡剤、消泡剤、石膏、高炉スラグ微粉末、ポゾラン物質、撥水剤、表面硬化剤等が挙げられる。 In addition to cement, waste rock wool, and water, the recycling blocks of the present invention can contain one or more admixtures, provided that the effects of the present invention are not impaired. Examples of such admixtures include cement polymers, thickeners, cement dispersants, expansive agents, waterproofing agents, rust inhibitors, shrinkage-reducing agents, pigments, fibers other than rock wool, water repellents, anti-efflorescence agents, quick-setting additives, quick-hardening additives, setting retarders, foaming agents, antifoaming agents, gypsum, ground granulated blast furnace slag, pozzolanic substances, water repellents, and surface hardeners.
本発明のロックウール廃材の再生方法は、上記のロックウール廃材の再生用ブロックを、溶融炉に投入し溶融させた溶融物を繊維化させることを特徴とする。 The method for recycling waste rock wool of the present invention is characterized by placing the above-mentioned blocks of waste rock wool for recycling into a melting furnace, melting the resulting molten material, and then fiberizing it.
以下に実施例を挙げて、本発明をさらに詳細に説明するが、本発明はこれら実施例に何ら限定されるものではない。 The present invention will be explained in more detail below using examples, but the present invention is not limited to these examples in any way.
［実施例１］
＜ロックウール廃材の再生用ブロックの作製＞
以下の使用材料を用いて、表１に示す割合でロックウール廃材とセメントと水をミキサで混練し、内径５０mm、内側の高さ１００mmのプラスティック製モルタル用型枠に詰め、直径５０mmの円柱鋼棒で２０mm程度押し込み加圧成形し、６日間２０℃、相対湿度６０％の室内に静置し、再生用ブロックを作製した。ロックウール廃材は、ロックウール廃材１～３を適宜混合し又は一部単独で使用した。
＜使用材料＞
・セメント： 普通ポルトランドセメント
・ロックウール廃材１： 綿状廃材
・ロックウール廃材２： ロックウール製造時の繊維化が不充分な廃材
・ロックウール廃材３： ロックウール製造時の集塵機で集塵されたダストからなる廃材
・水： 水道水
[Example 1]
<Production of recycled blocks from rock wool waste>
Using the materials below, waste rock wool, cement, and water were mixed in a mixer in the proportions shown in Table 1, packed into a plastic mortar form with an inner diameter of 50 mm and an inner height of 100 mm, pressed about 20 mm with a 50 mm diameter cylindrical steel rod to form a pressure shape, and left to stand for 6 days in a room at 20°C and a relative humidity of 60% to produce a block for recycling. The waste rock wool was a suitable mixture of rock wool waste 1 to 3, or some was used alone.
<Materials used>
Cement: Ordinary Portland cement. Rock wool waste 1: Cotton-like waste. Rock wool waste 2: Waste material that was insufficiently fiberized during rock wool manufacturing. Rock wool waste 3: Waste material consisting of dust collected by a dust collector during rock wool manufacturing. Water: Tap water.
作製したロックウール廃材の再生用ブロックについて、以下に示す品質評価試験を行った。試験結果を表２に示した。合わせて使用したロックウール廃材の軽装嵩密度を測定し、表２に合わせて示した。
＜圧縮強度試験＞
島津製作所社製精密万能試験機「オートグラフ」（商品名）を用いて、載荷速度１mm／分として供試体の圧縮強度を求めた。但し、キャッピングは行わず、養生は２０℃相対湿度６０％の恒温室内で６日間養生したものを供試体とした。
＜含水率試験＞
作製した供試体を庫内温度１０５℃の乾燥機内で恒量になるまで乾燥させ、乾燥前の供試体の質量（Ｗ０）と乾燥後（絶乾後）の供試体の質量（Ｗ１）より、次式（２）により含水率求めた。
含水率（％）＝（Ｗ０－Ｗ１）÷Ｗ１×１００ ・・・・・（２）
The produced recycled rock wool blocks were subjected to the following quality evaluation tests. The test results are shown in Table 2. The loose bulk density of the rock wool waste used was also measured and is shown in Table 2.
<Compression strength test>
The compressive strength of the specimen was determined at a loading rate of 1 mm/min using a precision universal testing machine "Autograph" (product name) manufactured by Shimadzu Corporation. However, the specimens were not capped and were cured for 6 days in a thermostatic chamber at 20°C and a relative humidity of 60%.
<Moisture content test>
The prepared specimens were dried in a dryer with an internal temperature of 105°C until they reached a constant weight, and the moisture content was calculated using the following formula (2) from the mass of the specimen before drying (W 0 ) and the mass of the specimen after drying (after bone dryness) (W 1 ).
Moisture content (%) = (W 0 - W 1 ) ÷ W 1 × 100 (2)
本発明の実施例に当たる水準２－１２のロックウール廃材の再生用ブロックは、何れも、含水率が０．５％以下と小さく且つ圧縮強度が１．０Ｎ／mm2以上であった。 The recycled blocks of waste rock wool of level 2-12, which are examples of the present invention, all had a low moisture content of 0.5% or less and a compressive strength of 1.0 N/mm 2 or more.
本発明は、例えば、ロックウールの再生において好適に使用することができる。 The present invention can be suitably used, for example, in the regeneration of rock wool.
Claims (2)
ρ＝（Ｍ１－Ｍ０）÷Ｖ ・・・・・（１） The loose bulk density of the waste rock wool is 0.4 g/ cm3 or more, the waste rock wool is 5 to 30 parts by mass of cement per 100 parts by mass of solids, and 19 to 35 parts by mass of water per 100 parts by mass of solids. The loose bulk density is determined by gently placing the waste rock wool into a container whose volume (V) is known, scraping off (dropping) the part of the waste rock wool that protrudes above the top of the container without applying vibration such as tapping to the container, measuring the mass (M 1 ) when the waste rock wool is filled up to the top of the container, and using the mass (M 0 ) of the empty container, the loose bulk density ρ is calculated using the following formula (1). This is a regeneration block, which is a block to be put into a melting furnace as a raw material when producing rock wool to regenerate the waste rock wool.
ρ=(M 1 - M 0 )÷V (1)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004174327A (en) | 2002-11-25 | 2004-06-24 | Nippon Steel Chem Co Ltd | Iron recovery and recycling method for iron-containing wastewater |
| JP2014100104A (en) | 2012-11-21 | 2014-06-05 | Taiheiyo Material Kk | Plant culture medium, apparatus for plant culture medium, and method of manufacturing apparatus for plant culture medium |
| JP2016144801A (en) | 2015-01-30 | 2016-08-12 | 住友大阪セメント株式会社 | Inorganic fiber waste processing method, cement raw material, and inorganic fiber waste processing apparatus |
| CN112031259A (en) | 2020-09-08 | 2020-12-04 | 北京金亚润环保科技有限公司 | Production method for manufacturing heat-insulating filling block and heat-insulating building block brick by using rock wool waste |
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| JPH01192743A (en) * | 1988-01-27 | 1989-08-02 | Nippon Steel Chem Co Ltd | Method for producing briquettes and rock wool |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004174327A (en) | 2002-11-25 | 2004-06-24 | Nippon Steel Chem Co Ltd | Iron recovery and recycling method for iron-containing wastewater |
| JP2014100104A (en) | 2012-11-21 | 2014-06-05 | Taiheiyo Material Kk | Plant culture medium, apparatus for plant culture medium, and method of manufacturing apparatus for plant culture medium |
| JP2016144801A (en) | 2015-01-30 | 2016-08-12 | 住友大阪セメント株式会社 | Inorganic fiber waste processing method, cement raw material, and inorganic fiber waste processing apparatus |
| CN112031259A (en) | 2020-09-08 | 2020-12-04 | 北京金亚润环保科技有限公司 | Production method for manufacturing heat-insulating filling block and heat-insulating building block brick by using rock wool waste |
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