JP2002211962A - Method of manufacturing hardened body by carbonation - Google Patents

Method of manufacturing hardened body by carbonation

Info

Publication number
JP2002211962A
JP2002211962A JP2001003664A JP2001003664A JP2002211962A JP 2002211962 A JP2002211962 A JP 2002211962A JP 2001003664 A JP2001003664 A JP 2001003664A JP 2001003664 A JP2001003664 A JP 2001003664A JP 2002211962 A JP2002211962 A JP 2002211962A
Authority
JP
Japan
Prior art keywords
based material
carbonation
lime
magnesium carbonate
curing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2001003664A
Other languages
Japanese (ja)
Other versions
JP4833415B2 (en
Inventor
Hideo Ide
秀夫 井出
Kiyoshi Shibata
清 柴田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP2001003664A priority Critical patent/JP4833415B2/en
Publication of JP2002211962A publication Critical patent/JP2002211962A/en
Application granted granted Critical
Publication of JP4833415B2 publication Critical patent/JP4833415B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/10—Lime cements or magnesium oxide cements
    • C04B28/105—Magnesium oxide or magnesium carbonate cements
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PROBLEM TO BE SOLVED: To harden a coal-base material in a short curing period. SOLUTION: In obtaining the hardened body by hardening the coal-base material, such as steel making slag, by carbonation, a solid magnesium carbonate-base substance and water are compounded with the coal-base material and the mixture is kneaded and cured, by which the hardened body is obtained in the short curing period without using high-purity carbon dioxide.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業の属する技術分野】本発明は、石灰系材料を炭酸
化により硬化させる際に炭酸ガスを使わずに炭酸化させ
て硬化体を得る方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for obtaining a hardened body by carbonating a lime-based material without using carbon dioxide gas when hardening the same by carbonation.

【０００２】[0002]

【従来の技術】水と混練した消石灰は空地中の炭酸ガス
と徐々に反応して炭酸カルシウムに変化して硬化し耐水
性のある材料となる。この現象を利用して昔からしっく
いあるいは石灰プラスターとして塗装材料などに使用さ
れてきた。また近年、製鋼スラグのＣａＯに着目し、こ
れを炭酸ガスで炭酸化して硬化体を製造する方法も公表
されている。例えば、特開昭５８−７４５５９号公報
に示されるように、粒径２.５ｍｍ以下の製鋼風砕スラ
グに高炉水砕スラグ、セメントおよび石膏の少なくとも
１つを添加し、所定量の水を加えて混練した混練物を所
定形状に加圧成形した後、炭酸ガス雰囲気中で養生し炭
酸化反応を行って硬化体を得ている。2. Description of the Related Art Slaked lime kneaded with water gradually reacts with carbon dioxide in the open space, changes into calcium carbonate, and hardens to become a water-resistant material. Utilizing this phenomenon, plaster or lime plaster has been used as a coating material for a long time. In recent years, attention has been paid to CaO in steelmaking slag, and a method of producing a hardened body by carbonating the CaO with carbon dioxide has been disclosed. For example, as disclosed in JP-A-58-74559, at least one of blast-furnace granulated slag, cement and gypsum is added to steel-milled slag having a particle size of 2.5 mm or less, and a predetermined amount of water is added. The kneaded material obtained by the kneading is press-formed into a predetermined shape, then cured in a carbon dioxide gas atmosphere and subjected to a carbonation reaction to obtain a cured product.

【０００３】[0003]

【発明が解決しようとする課題】本発明者らは、上記の
方法を石灰系材料の硬化体製造に適用しようと試みた。
その結果、硬化体が大きくなるほど炭酸ガスによって中
心部まで確実に炭酸化させることが困難になることが判
明した。これは、硬化体の外部から炭酸ガスが内部へ拡
散することで炭酸化するのであるが、硬化体が大きくな
るほど炭酸ガスの必要量を中心部まで供給するのに時間
が掛かるからである。また、上記の方法では加圧成形が
必要であるが、これも硬化体の大きさや形状に対する制
約条件となる。DISCLOSURE OF THE INVENTION The present inventors have attempted to apply the above-described method to the production of a cured product of a lime-based material.
As a result, it was found that the larger the cured product, the more difficult it is to reliably carbonate to the center with carbon dioxide gas. This is because carbonation is caused by diffusion of carbon dioxide gas from the outside of the cured body to the inside, and it takes more time to supply a required amount of carbon dioxide gas to the center as the cured body becomes larger. In addition, pressure molding is necessary in the above method, which is also a constraint on the size and shape of the cured product.

【０００４】本発明はこの問題を解決し、大きさや形状
によらずに硬化体内部のどの部位も物性的に均一な硬化
体を短時間かつ加圧成形無しで製造することを目的とす
る。An object of the present invention is to solve this problem and to produce a cured product having uniform physical properties at any point inside the cured product irrespective of size or shape, in a short time and without pressure molding.

【０００５】[0005]

【課題を解決するための手段】本発明は、石灰系材料を
炭酸化により硬化させて硬化体を得る製造方法におい
て、該石灰系材料に固体の炭酸マグネシウム系物質と水
を配合して混練・養生することにより硬化させることを
特徴とする炭酸化による硬化体の製造方法である。SUMMARY OF THE INVENTION The present invention relates to a method for producing a cured product by hardening a lime-based material by carbonation. This is a method for producing a cured product by carbonation, wherein the cured product is cured by curing.

【０００６】[0006]

【発明の実施の形態】以下、本発明を詳細について説明
する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

【０００７】石灰系材料と固体の炭酸マグネシウム系物
質を適当な粒度に調整し、該石灰系材料と炭酸マグネシ
ウム系化合物に所定量の水を配合して混練し、適当な型
枠に流し込んで養生する。石灰系材料、炭酸マグネシウ
ム系物質、水の配合比は目的の強度に応じて選んでよ
い。例えば、高強度を求める場合は石灰系材料と炭酸マ
グネシウム系物質の配合量を近づけ、また混練可能な限
り水の配合量を下げる方がよい。炭酸の供給源としての
炭酸マグネシウム系物質の配合量としては、石灰系材料
と炭酸マグネシウム系物質の合計の質量に対して、１０
〜５０質量％が望ましい。炭酸マグネシウム系物質の配
合量が１０質量％未満の場合は炭酸の供給が不足し、５
０質量％を超えると炭酸の供給が過剰となる。また、水
の配合量は固形物１００質量％に対して、混練上５〜３
５質量％をさらに添加することが望ましい。ここで、固
形物とは、石灰系材料と炭酸マグネシウム系物質とを混
練したものを意味する。養生中に石灰系材料からはＣａ
2+とＯＨ-、炭酸マグネシウム系物質からはＭｇ2+とＣ
Ｏ3 2-が水中に溶出する。これらは以下のような反応に
より炭酸カルシウムと水酸化マグネシウムを生成し、こ
れら生成物は水に対する溶解度が小さいので析出する。[0007] The lime-based material and the solid magnesium carbonate-based material are adjusted to an appropriate particle size, a predetermined amount of water is mixed with the lime-based material and the magnesium carbonate-based compound, kneaded, and poured into an appropriate mold to cure. I do. The mixing ratio of the lime-based material, magnesium carbonate-based material and water may be selected according to the desired strength. For example, when high strength is required, it is better to make the mixing amounts of the lime-based material and the magnesium carbonate-based material closer and to lower the mixing amount of water as far as possible. The amount of the magnesium carbonate-based material as the carbonic acid supply source is 10% with respect to the total mass of the lime-based material and the magnesium carbonate-based material.
-50 mass% is desirable. If the amount of the magnesium carbonate-based material is less than 10% by mass, the supply of carbonic acid is insufficient, and
If it exceeds 0% by mass, the supply of carbonic acid becomes excessive. Further, the mixing amount of water is 5 to 3% based on the kneading with respect to 100% by mass of the solid matter.
It is desirable to further add 5% by mass. Here, the solid means a mixture of a lime-based material and a magnesium carbonate-based substance. During curing, lime-based
2+ and OH -, Mg 2+ and C from magnesium carbonate-based material
O 3 2-elutes into water. These produce calcium carbonate and magnesium hydroxide by the following reaction, and these products precipitate because of their low solubility in water.

【０００８】 Ｃａ2+＋ＣＯ3 2-→ＣａＣＯ3↓・・・・・・・・・・・・・・・(1) Ｍｇ2+＋２ＯＨ-→Ｍｇ(ＯＨ)2↓・・・・・・・・・・・・・(2) 上記の析出物が粒子間の空隙に充填され、空隙が徐々に
減少して緻密で高強度の硬化体を形成する。石灰系材料
とは、ＣａＯを主要成分の１つとして含むものであり、
例えば、酸化カルシウム、水酸化カルシウム、セメン
ト、コンクリート、製鋼スラグ、高炉水砕スラグなどで
ある。一方、炭酸マグネシウム系物質とは、ＭｇＣＯ3
を主要成分の１つとして含むものであり、例えば、炭酸
マグネシウムの無水物または水和物、ドロマイト、水酸
化炭酸マグネシウム、ＭｇＯ−ＳｉＯ2系鉱物(蛇紋岩、
滑石、かんらん石等)と炭酸ガスまたは炭酸塩を反応さ
せて炭酸マグネシウム含有物にしたものなどである。こ
こで主要成分としては、ＣａＯやＭｇＣＯ3を１５質量
％程度以上含んでいることが望ましい。Ca 2+ + CO 3 2- → CaCO 3 ↓ ・ ・ ・ (1) Mg 2+ + 2OH − → Mg (OH) 2 ↓ ・ ・ ・ ・ ・ ・(2) The above-mentioned precipitates are filled in the voids between the particles, and the voids are gradually reduced to form a dense and high-strength cured product. The lime-based material contains CaO as one of the main components,
For example, calcium oxide, calcium hydroxide, cement, concrete, steelmaking slag, granulated blast furnace slag, and the like. On the other hand, magnesium carbonate-based material is MgCO 3
The those containing as one of the major components, such as anhydrides or hydrates of magnesium carbonate, dolomite, magnesium hydroxide carbonate, MgO-SiO 2 based mineral (serpentinite,
Talc, olivine, etc.) and carbon dioxide gas or carbonate to give a magnesium carbonate-containing material. Here, it is desirable that CaO or MgCO 3 be contained as a major component in an amount of about 15% by mass or more.

【０００９】本発明で固体の炭酸マグネシウム系物質に
限定する理由は、炭酸源が固体であれば石灰系材料と直
接混合することができるので、石灰系材料の粒子のごく
近傍に炭酸源があることになり、炭酸化速度が速くな
る。従来用いられているガス状のＣＯ2では、石灰系材
料の外側からガスが材料の細孔を通って内部へ拡散しな
がら炭酸化が進行するので、炭酸化に時間がかかる。The reason why the present invention is limited to the solid magnesium carbonate-based material is that if the carbonic acid source is a solid, it can be directly mixed with the lime-based material. In other words, the carbonation rate increases. With conventional gaseous CO 2 , carbonation proceeds while gas diffuses from the outside of the lime-based material through the pores of the material to the inside, so that carbonation takes time.

【００１０】通常、混練は常温で行い、必要により加
熱、好ましくは６０℃迄昇温して行うことができる。加
熱した場合には硬化反応促進の効果が得られる。Usually, the kneading is carried out at room temperature, and if necessary, the kneading can be carried out by heating, preferably by raising the temperature to 60.degree. When heated, the effect of accelerating the curing reaction is obtained.

【００１１】また、養生には、水中養生、空中養生、連
結硬化養生（水中養生後に空中養生する）などがある。
本発明は、これらの養生のうち、特定の方法に限定され
るものではない。The curing includes underwater curing, aerial curing, and linked hardening curing (aerial curing after underwater curing).
The present invention is not limited to any of these curing methods.

【００１２】[0012]

【実施例】以下、本発明を実施例に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

【００１３】本実施例では、石灰系材料として製鋼スラ
グ、炭酸マグネシウム系物質として炭酸マグネシウムの
無水物、すなわちマグネサイトを選んだ。製鋼スラグの
化学組成を表１に示す。製鋼スラグを冷却・凝固させた
後、２.５ｍｍアンダーに破砕するか、あるいは２.５ｍ
ｍよりも粗い粒度で破砕して分級し２.５ｍｍアンダー
品を得た。また、マグネサイトを０.１ｍｍアンダーに
破砕した。両者を表２の条件で配合し、大気中において
常温で混練して、１×１×１ｍの型枠に流し込み養生し
た。In the present embodiment, steelmaking slag was selected as the lime-based material, and anhydrous magnesium carbonate, ie, magnesite, was selected as the magnesium carbonate-based material. Table 1 shows the chemical composition of the steelmaking slag. After cooling and solidifying the steelmaking slag, crush it under 2.5 mm or 2.5 m
It was crushed with a particle size coarser than m and classified to obtain a 2.5 mm under product. In addition, magnesite was crushed under 0.1 mm. Both were blended under the conditions shown in Table 2, kneaded in the air at room temperature, poured into a 1 × 1 × 1 m mold and cured.

【００１４】従来法は特開昭５８−７４５５９号公報に
示されるように、製鋼スラグの２.５ｍｍアンダー破砕
品に水を加えて混練し、１×１×１ｍの型枠に流し込ん
で１０ＭＰａの圧力で加圧成形し、炭酸ガス１００％の
雰囲気で、温度５０℃により養生し、炭酸化反応により
硬化させた。養生期間と圧縮強度の関係を図１に示す。
図１で、マグネサイト配合量２０％、３０％、４０％が
本発明例、マグネサイト配合量０％＋炭酸ガス処理が従
来法である。図１より、本発明例では、養生期間が３０
日程度以下で強度がほぼ飽和に達するのに対し、従来法
では強度が飽和に達するのに１５０日以上かかった。従
って、本発明例は比較例に対して養生期間が大幅に短縮
された。According to the conventional method, as disclosed in Japanese Patent Application Laid-Open No. 58-74559, water is added to a 2.5 mm under-crushed steelmaking slag, kneaded, poured into a 1 × 1 × 1 m formwork, and subjected to 10 MPa. The mixture was molded under pressure, cured at a temperature of 50 ° C. in an atmosphere of 100% carbon dioxide, and cured by a carbonation reaction. FIG. 1 shows the relationship between the curing period and the compressive strength.
In FIG. 1, 20%, 30% and 40% of the magnesite compounding amount is an example of the present invention, and the magnesite compounding amount of 0% + carbon dioxide treatment is the conventional method. According to FIG. 1, in the example of the present invention, the curing period is 30.
While the intensity almost reaches saturation in about a day or less, it takes 150 days or more for the intensity to reach saturation in the conventional method. Therefore, the curing period of the present invention example was significantly shortened as compared with the comparative example.

【００１５】[0015]

【表１】 [Table 1]

【００１６】[0016]

【表２】 [Table 2]

【００１７】[0017]

【発明の効果】本発明により、製鋼スラグのような石灰
系材料を炭酸化により硬化させる際に、炭酸ガスを使わ
ずに短い養生期間で硬化させることが可能となった。According to the present invention, when a lime-based material such as steelmaking slag is hardened by carbonation, it can be hardened in a short curing period without using carbon dioxide gas.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 本発明と従来法について養生期間と強度の関
係を示すグラフFIG. 1 is a graph showing the relationship between curing period and strength for the present invention and the conventional method.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 石灰系材料を炭酸化により硬化させて硬
化体を得る製造方法において、該石灰系材料に固体の炭
酸マグネシウム系物質と水を配合して混練・養生するこ
とにより硬化させることを特徴とする炭酸化による硬化
体の製造方法。1. A method for producing a cured product by curing a lime-based material by carbonation, wherein a solid magnesium carbonate-based material and water are mixed with the lime-based material, and the mixture is cured by kneading and curing. A method for producing a cured product by carbonation.
JP2001003664A 2001-01-11 2001-01-11 Method for producing cured body by carbonation Expired - Lifetime JP4833415B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001003664A JP4833415B2 (en) 2001-01-11 2001-01-11 Method for producing cured body by carbonation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001003664A JP4833415B2 (en) 2001-01-11 2001-01-11 Method for producing cured body by carbonation

Publications (2)

Publication Number Publication Date
JP2002211962A true JP2002211962A (en) 2002-07-31
JP4833415B2 JP4833415B2 (en) 2011-12-07

Family

ID=18871972

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013208571A (en) * 2012-03-30 2013-10-10 Nippon Steel & Sumitomo Metal Corp Method for treating civil engineering and construction material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5080313A (en) * 1973-11-20 1975-06-30
JPS557547A (en) * 1978-07-03 1980-01-19 Asahi Chemical Ind Manufacture of carbonic hardening article
JPH05345650A (en) * 1992-06-16 1993-12-27 Kubota Corp Production of flame-resistant fiber-reinforced cement board
JPH07237955A (en) * 1994-02-23 1995-09-12 Nichiha Corp Production of inorganic plate and production device therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5080313A (en) * 1973-11-20 1975-06-30
JPS557547A (en) * 1978-07-03 1980-01-19 Asahi Chemical Ind Manufacture of carbonic hardening article
JPH05345650A (en) * 1992-06-16 1993-12-27 Kubota Corp Production of flame-resistant fiber-reinforced cement board
JPH07237955A (en) * 1994-02-23 1995-09-12 Nichiha Corp Production of inorganic plate and production device therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013208571A (en) * 2012-03-30 2013-10-10 Nippon Steel & Sumitomo Metal Corp Method for treating civil engineering and construction material

Also Published As

Publication number Publication date
JP4833415B2 (en) 2011-12-07

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