JP5683576B2 - 不定形耐火物用結合剤、不定形耐火物、及び不定形耐火物の施工方法 - Google Patents
不定形耐火物用結合剤、不定形耐火物、及び不定形耐火物の施工方法 Download PDFInfo
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- JP5683576B2 JP5683576B2 JP2012512921A JP2012512921A JP5683576B2 JP 5683576 B2 JP5683576 B2 JP 5683576B2 JP 2012512921 A JP2012512921 A JP 2012512921A JP 2012512921 A JP2012512921 A JP 2012512921A JP 5683576 B2 JP5683576 B2 JP 5683576B2
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
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Description
本願は、2010年04月28日に、日本に出願された特願2010−104559号に基づき優先権を主張し、その内容をここに援用する。
(1)α−SrAl2O4 の結晶相又はβ−SrAl2O4 の結晶相にCa成分を固溶した固溶体からなり、この固溶体の結晶子径が、前記α−SrAl2O4が固溶している場合は40nm以上75nm以下であり、前記β−SrAl2O4が固溶している場合は35nm以上70nm以下である、不定形耐火物用結合剤。
(2)前記α−SrAl2O4 の結晶相又は前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体を10質量%以上60質量%以下含有し、かつAl2O3が40質量%以上90質量%以下配合されている、上記(1)に記載の不定形耐火物用結合剤。
(3)更に、CaAl2O4 の結晶相にSr成分を固溶する固溶体が混合物として含有され、この固溶体の結晶子径が25nm以上60nm以下である、上記(1)に記載の不定形耐火物用結合剤。
(4)前記α−SrAl2O4 の結晶相又は前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体と前記CaAl2O4 の結晶相にSr成分を固溶する固溶体とを10質量%以上60質量%以下含有し、かつAl2O3が40質量%以上90質量%以下配合されている、上記(3)に記載の不定形耐火物用結合剤。
(5)前記α−SrAl2O4 の結晶相にCa成分を固溶する固溶体と、前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体との両方が混合物として含有されている、上記(1)に記載の不定形耐火物用結合剤。
(6)前記α−SrAl2O4 の結晶相にCa成分を固溶する固溶体と前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体との両方を合計で10質量%以上60質量%以下含有し、かつAl2O3が40質量%以上90質量%以下配合されている、上記(5)に記載の不定形耐火物用結合剤。
(7)更に、前記CaAl2O4 の結晶相にSr成分を固溶する固溶体が混合物として含有されている、上記(5)に記載の不定形耐火物用結合剤。
(8)前記α−SrAl2O4 の結晶相にCa成分を固溶する固溶体と、前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体と、前記CaAl2O4 の結晶相にSr成分を固溶する固溶体とを合計で10質量%以上60質量%以下含有し、かつAl2O3が40質量%以上90質量%以下配合されている、上記(7)に記載の不定形耐火物用結合剤。
(9)前記不定形耐火物用結合剤中に、SiO2,TiO2,Fe2O3,MgO及びBaOの群から選ばれる1種又は2種以上を含み、その含有量が12質量%以内である、上記(1)に記載の不定形耐火物用結合剤。
(10)前記不定形耐火物用結合剤中に、分散剤及び硬化遅延剤の少なくとも一方が配合されている、上記(1)に記載の不定形耐火物用結合剤。
(11)上記(1)〜(10)のいずれか1項に記載の不定形耐火物用結合剤を、耐火骨材に配合してなり、前記不定形耐火物用結合剤及び前記耐火骨材の合計量を100質量%とした場合に、前記不定形耐火物用結合剤の含有量が、0.3質量%以上かつ20質量%以下である、不定形耐火物。
(12)粒径0.8nm以上1μm以下の超微粉アルミナが含まれ、前記不定形耐火物用結合剤、前記耐火骨材及び前記超微粉アルミナの合計量を100質量%とした場合に、前記超微粉アルミナの含有量が、70質量%以下である、上記(11)に記載の不定形耐火物。
(13)前記不定形耐火物用結合剤及び前記耐火骨材の合計量を100質量%とした場合に、前記不定形耐火物用結合剤の含有量が、0.5質量%以上かつ12質量%以下である、上記(11)に記載の不定形耐火物。
(14)更に、分散剤、硬化遅延剤及び硬化促進剤のうちの少なくとも一つが添加されている、上記(11)に記載の不定形耐火物。
(15)前記分散剤が、ポリカルボン酸系分散剤、リン酸系分散剤、オキシカルボン酸類、メラミン系分散剤、ナフタレン系分散剤、及びリグニンスルホン酸系分散剤からなる群より選ばれる1種又は2種以上であり、前記硬化促進剤が、アルカリ金属塩類及びアルミン酸塩の少なくとも一方であり、前記硬化遅延剤が、ホウ酸類及びケイフッ化物の少なくとも一方である、上記(14)に記載の不定形耐火物。
(16)上記(1)〜(10)のいずれか1項に記載の不定形耐火物用結合剤を、粒径1μm以下の超微粉アルミナを含む耐火骨材に配合して混練した後、得られた不定形耐火物を施工する工程を含む、不定形耐火物の施工方法。
また、SiO2,TiO2,Fe2O3,MgO,BaOの含有量が12質量%以下であると、不定形耐火物の養生後強度が上昇する場合がある。この原因は、これらの成分を含む鉱物が非晶質を生成し、水と反応した場合にイオンの溶出を容易にするためと推測される。強度上昇は5質量%以下で大きく、12質量%まで現れる。しかし12質量%を超える場合では、これらの成分を含む鉱物が水への溶解性が乏しい結晶相を生成するためか、逆に強度が低下する場合がある。また、不純物として融点の低下を引き起こすためか、高温での耐食性も低下する場合がある。
Al2O3+2OH−+3H2O → 2[Al(OH)4]−・・・(1)
2Al(OH)3→Al2O3+3H2O・・・(2)
本発明例2〜3、本発明例6〜8、参考例1−1、参考例4−1、参考例5−1及び参考例1〜6は、結合剤の成分がすべてα−SrAl2O4にCa成分を固溶するように原料調合をし、その結晶子径が表中の値となるように焼成条件を調整して作製した固溶体からなる結合剤を用いて製造した不定形耐火物を、本発明例9〜16及び参考例7〜12は、結合剤の成分がすべてβ−SrAl2O4にCa成分を固溶するように原料調合をし、その結晶子径が表中の値となるように焼成条件を調整して作製した固溶体からなる結合剤を用いて製造した不定形耐火物を、比較例1〜3は結合剤の成分にSrを含有しないものを、参考例13〜16は結合剤の成分にCa成分を含まないものをそれぞれ用いた不定形耐火物の、フロー値、養生曲げ強度の測定、およびスラグを用いた回転侵食試験を行ったものである。各試験例の結合剤の原料配合、固溶体の結晶子径、焼成条件、不定形耐火物のフロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表1〜3に示す。
本発明例17〜21は、CaxSr1−xAl2O4のXの値が0.05となるα−SrAl2O4にCa成分を固溶する固溶体とα−Al2O3を所定の割合で混合した結合剤を用いて製造した不定形耐火物を、本発明例22〜26は、CaxSr1−xAl2O4のXの値が0.30となるβ−SrAl2O4にCa成分を固溶する固溶体とα−Al2O3を所定の割合で混合した結合剤を用いて製造した不定形耐火物を、比較例4〜6は結合剤の成分がCaAl2O4になるよう原料を調合し作製した結合剤とα−Al2O3を所定の割合で混合した結合剤を用いて製造した不定形耐火物について、フロー値、養生曲げ強度の測定、およびスラグを用いた回転侵食試験を行ったものである。各試験例の固溶体組成、固溶体の結晶子径、固溶体及びCaAl2O4とα−Al2O3の配合割合、不定形耐火物のフロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表4,5に示す。尚、何れの固溶体及び結合剤も1500℃の最大温度を2時間保持する焼成を施し作製を行った。
本発明例27〜37及び参考例17〜19は、結合剤の成分の全てがα−SrAl2O4にCa成分を固溶した固溶体と、CaAl2O4にSr成分を固溶した固溶体が得られるように原料調合をし、その結晶子径が表中の値となるように焼成条件を調整して作製した固溶体からなる結合剤を用いて製造した不定形耐火物について、また、本発明例38〜48及び参考例20〜22は、結合剤の成分の全てがβ−SrAl2O4にCa成分を固溶した固溶体とCaAl2O4にSr成分を固溶した固溶体が得られるように原料調合をし、その結晶子径が表中の値となるように焼成条件を調整して作製した固溶体からなる結合剤を用いて製造した不定形耐火物の、フロー値、養生曲げ強度の測定、およびスラグを用いた回転侵食試験を行ったものである。尚、α−SrAl2O4にCa成分を固溶した固溶体及びβ−SrAl2O4にCa成分を固溶した固溶体は、最高温度1500℃を2時間保持する焼成条件で作製を行った。各試験例の原料配合、焼成条件、固溶体の結晶子径、不定形耐火物のフロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表6〜8に示す。
本発明例49〜53は、CaxSr1−xAl2O4のXの値が0.05となるα−SrAl2O4にCa成分を固溶する固溶体と、CaxSr1−xAl2O4のXの値が0.95となるCaAl2O4にSr成分を固溶する固溶体とα−Al2O3を所定の割合で混合した結合剤を用いて製造した不定形耐火物を、本発明例54〜58は、CaxSr1−xAl2O4のXの値が0.30となるβ−SrAl2O4にCa成分を固溶する固溶体とCaxSr1−xAl2O4のXの値が0.95となるCaAl2O4にSr成分を固溶する固溶体とα−Al2O3を所定の割合で混合した結合剤を用いて製造した不定形耐火物について、フロー値、養生強度の測定、およびスラグを用いた回転侵食試験を行ったものである。各試験例の固溶体組成、結晶子径、固溶体とα−Al2O3の配合割合、不定形耐火物のフロー値と養生強度の測定結果、および回転侵食試験結果を表9に示す。尚、何れの固溶体も1500℃の最大温度を2時間保持する焼成を施し作製を行った。
本発明例59〜94は、CaxSr1−xAl2O4のXの値が0.05及び0.15となるα−SrAl2O4にCa成分を固溶する結晶子径が40nm以上75nm以下である固溶体とCaxSr1−xAl2O4のXの値が0.30及び0.55となるβ−SrAl2O4にCa成分を固溶する結晶子径が35nm以上70nm以下である固溶体の両方を含有する結合剤を用いて製造した不定形耐火物のフロー値、養生曲げ強度の測定、およびスラグを用いた回転侵食試験を行ったものである。各試験例の固溶体組成、固溶体の結晶子径、焼成条件、固溶体の配合割合、不定形耐火物のフロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表10〜13に示す。各固溶体は結晶子径の値が表中の値となるように焼成条件を調整して作製した。
本発明例95〜99は、CaxSr1−xAl2O4のxの値が0.05となるα−SrAl2O4にCa成分を固溶する固溶体と、CaxSr1−xAl2O4のxの値が0.30となるβ−SrAl2O4にCa成分を固溶する固溶体及びα−Al2O3を所定の割合で混合した結合剤を用いて製造した不定形耐火物のフロー値、養生曲げ強度の測定、およびスラグを用いた回転侵食試験を行ったものである。各試験例の固溶体組成、固溶体の結晶子径、固溶体及び結合剤とα−Al2O3の配合割合、不定形耐火物のフロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表14に示す。尚、何れの固溶体も1500℃の最大温度を2時間保持する焼成を施し作製を行った。
本発明例100〜104は、CaxSr1−xAl2O4Al2O4のXの値が0.05となるα−SrAl2O4にCa成分を固溶する固溶体と、CaxSr1−xAl2O4のXの値が0.30となるβ−SrAl2O4にCa成分を固溶する固溶体と、CaxSr1−xAl2O4のXの値が0.95となるCaAl2O4にSr成分を固溶する固溶体を配合した結合剤を用いて製造した不定形耐火物のフロー値、養生曲げ強度の測定、およびスラグを用いた回転侵食試験を行ったものである。各試験例の固溶体組成、固溶体の結晶子径、固溶体の配合割合、不定形耐火物のフロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表15に示す。尚、何れの固溶体も1500℃の最大温度を2時間保持する焼成を施し作製を行った。
本発明例105〜109は、CaxSr1−xAl2O4のXの値が0.05となるα−SrAl2O4にCa成分を固溶する固溶体と、CaxSr1−xAl2O4のXの値が0.30となるβ−SrAl2O4にCa成分を固溶する固溶体と、CaxSr1−xAl2O4のXの値が0.95となるCaAl2O4にSr成分を固溶する固溶体及びα−Al2O3を配合した結合剤を用いて製造した不定形耐火物のフロー値、養生曲げ強度の測定、およびスラグを用いた回転侵食試験を行ったものである。各試験例の固溶体組成、固溶体の結晶子径、固溶体とα−Al2O3の配合割合、不定形耐火物のフロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表16に示す。尚、何れの固溶体も1500℃の最大温度を2時間保持する焼成を施し作製を行った。
本発明例110〜221は、使用する原料及び製造工程からの不可避的不純物の影響を確認する為、SiO2,TiO2,Fe2O3,MgO,BaOから選ばれる1種又は2種以上の各種コンタミネーション成分を調合して製造した固溶体を配合した結合剤を用いた不定形耐火物の特性評価結果である。また、比較例7〜30は各種コンタミネーション成分量が本発明の範囲を外れる場合の特性評価結果である。
尚、本発明例110〜137及び比較例7〜14は、結合剤の成分がα−SrAl2O4又はβ−SrAl2O4にCa成分を固溶する固溶体からなる結合剤、本発明例138〜149は、結合剤の成分がα−SrAl2O4又はβ−SrAl2O4にCa成分を固溶する固溶体にAl2O3が配合されてなる結合剤、本発明例150〜197及び比較例15〜30は、結合剤の成分がα−SrAl2O4にCa成分を固溶する固溶体、β−SrAl2O4にCa成分を固溶する固溶体及びCaAl2O4にSr成分を固溶する固溶体から選ばれる2種又は3種の混合物からなる結合剤、本発明例198〜221は、結合剤の成分がα−SrAl2O4にCa成分を固溶する固溶体、β−SrAl2O4にCa成分を固溶する固溶体及びCaAl2O4にSr成分を固溶する固溶体から選ばれる2種又は3種の混合物にAl2O3が配合されてなる結合剤を用いた不定形耐火物の特性測定結果である。
各本発明例及び比較例の化学組成及び化学成分、不定形耐火物のフロー値と養生後曲げ強度の測定結果、及び回転侵食試験結果を表17〜43に示す。尚、何れの固溶体も1500℃の最大温度を2時間保持する焼成を施し作製を行った。また、作製した結合剤の化学成分は蛍光エックス線分析法(リガク社製走査型蛍光X線分析装置「ZSX PrimusII」)により測定を行った。
本発明例222〜257は、CaxSr1−xAl2O4のXの値が0.05、0.30及び0.95となる固溶体が得られるように原料調合をし、1500℃の最大温度を2時間保持する焼成を施し作製した各種固溶体とα−Al2O3を所定の割合で混合した結合剤に、分散剤及び硬化遅延剤のいずれか1種及び2種を配合したものを用いて製造した不定形耐火物のフロー値、養生曲げ強度の測定、およびスラグを用いた回転侵食試験を行ったものである。また、比較例31〜36は成分がCaAl2O4になるよう原料を調合し、1500℃の最大温度を2時間保持する焼成を施し作製した結合剤とα−Al2O3を所定の割合で混合した結合剤を用いて同様の試験を行ったものである。尚、加える水の量を結合剤と耐火骨材の混合物100質量%に対して6.2質量%と減じて不定形耐火物を作製した。各試験例の固溶体組成、固溶体の結晶子径、固溶体、CaAl2O4、α−Al2O3、分散剤と硬化遅延剤の配合割合、フロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表44〜47に示す。尚、表中の分散剤及び硬化遅延剤の配合量は、結合剤に対する割合(質量比)で示す。
本発明例258〜293及び参考例23〜34は不定形耐火物中の1μm以下の超微粉アルミナ量を0〜80質量%に変更した骨材と本発明の結合剤を用いて製造した不定形耐火物について、同様の試験を行ったものである。何れの試験もCaxSr1−xAl2O4のXの値が0.05、0.30及び0.95となる固溶体が得られるように原料調合をし、1500℃の最大温度を2時間保持する焼成を施し作製した各種固溶体及びそれらを混合したもの40質量%とα−Al2O360質量%が配合されている結合剤を用いた。1μm以下の超微粉アルミナ量が増減した分は粒度が75μm〜5mmの電融アルミナ量を調整し、アルミナ耐火骨材の合計の質量が同じになるように不定形耐火物を作製した。尚、結合剤、マグネシア、シリカフラワー、ビニロン繊維の配合割合及び添加水量は変更させない。各試験例の固溶体組成、固溶体の結晶子径、各種固溶体、α−Al2O3の配合割合、1μm以下の焼結アルミナ量、75μm〜5mmの電融アルミナ量、不定形耐火物のフロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表48〜52に示す。
本発明例294〜337及び参考例35〜44は、結合剤と耐火骨材の合計を100質量%とした場合の結合剤の量を変化させて、本発明の結合剤を用いて製造した不定形耐火物について、同様の試験を行ったものである。何れの試験もCaxSr1−xAl2O4のXの値が0.05、0.30及び0.95となる固溶体が得られるように原料調合をし、1500℃の最大温度を2時間保持する焼成を施し作製した各種固溶体及びそれらを混合したもの40質量%とα−Al2O360質量%が配合されている結合剤を用いた。各試験例の固溶体組成、固溶体の結晶子径、固溶体及びα−Al2O3の配合割合、結合剤の添加量、不定形耐火物のフロー値と養生曲げ強度の測定結果、および回転侵食試験結果を表53〜58に示す。
本発明例338〜515は、CaxSr1−xAl2O4のXの値が0.05、0.30及び0.95となる固溶体が得られるように原料調合をし、1500℃の最大温度を2時間保持する焼成を施し作製した各種固溶体及びそれらを混合したもの40質量%とα−Al2O360質量%が配合されている結合剤を用いて、各種分散剤、硬化遅延剤及び硬化促進剤のうちの少なくともいずれか1種を外割で所定量配合して不定形耐火物を作製し試験を行ったものである。また、比較例31〜47は結合剤の成分にSrを含有しない結合剤を用いて、分散剤、硬化遅延剤及び硬化促進剤のうちの少なくともいずれか1種を同様に配合して、不定形耐火物を作製し試験を行ったものである。尚、分散剤、硬化遅延剤、分散剤及び硬化遅延剤を配合した場合は、加える水の量を結合剤と耐火骨材の混合物100質量%に対して6.2質量%と減じて試験を行った。また、硬化促進剤のみを配合した場合は、通常通り6.8質量%の水を加えて試験を行った。粉体の分散剤、硬化遅延剤及び硬化促進剤は、結合剤、耐火骨材と共にオムニミキサーで混合して使用した。液体の分散剤は、含まれる固形成分の質量を添加量とし、溶媒部の質量分を加える水量から減じて所定の水量になるよう調整を行った。また、液体分散剤は混練水と混合して使用した。
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Claims (16)
- α−SrAl2O4 の結晶相又はβ−SrAl2O4 の結晶相にCa成分を固溶した固溶体からなり、この固溶体の結晶子径が、前記α−SrAl2O4が固溶している場合は40nm以上75nm以下であり、前記β−SrAl2O4が固溶している場合は35nm以上70nm以下であることを特徴とする、不定形耐火物用結合剤。
- 前記α−SrAl2O4 の結晶相又は前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体を10質量%以上60質量%以下含有し、かつAl2O3が40質量%以上90質量%以下配合されていることを特徴とする、請求項1に記載の不定形耐火物用結合剤。
- 更に、CaAl2O4 の結晶相にSr成分を固溶する固溶体が混合物として含有され、この固溶体の結晶子径が25nm以上60nm以下であることを特徴とする、請求項1に記載の不定形耐火物用結合剤。
- 前記α−SrAl2O4 の結晶相又は前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体と前記CaAl2O4 の結晶相にSr成分を固溶する固溶体とを10質量%以上60質量%以下含有し、かつAl2O3が40質量%以上90質量%以下配合されていることを特徴とする、請求項3に記載の不定形耐火物用結合剤。
- 前記α−SrAl2O4 の結晶相にCa成分を固溶する固溶体と、前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体との両方が混合物として含有されていることを特徴とする、請求項1に記載の不定形耐火物用結合剤。
- 前記α−SrAl2O4 の結晶相にCa成分を固溶する固溶体と前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体との両方を合計で10質量%以上60質量%以下含有し、かつAl2O3が40質量%以上90質量%以下配合されていることを特徴とする、請求項5に記載の不定形耐火物用結合剤。
- 更に、前記CaAl2O4 の結晶相にSr成分を固溶する固溶体が混合物として含有されていることを特徴とする、請求項5に記載の不定形耐火物用結合剤。
- 前記α−SrAl2O4 の結晶相にCa成分を固溶する固溶体と、前記β−SrAl2O4 の結晶相にCa成分を固溶する固溶体と、前記CaAl2O4 の結晶相にSr成分を固溶する固溶体とを合計で10質量%以上60質量%以下含有し、かつAl2O3が40質量%以上90質量%以下配合されていることを特徴とする、請求項7に記載の不定形耐火物用結合剤。
- 前記不定形耐火物用結合剤中に、SiO2,TiO2,Fe2O3,MgO,BaOの群から選ばれる1種又は2種以上を含み、その含有量が12質量%以内であることを特徴とする請求項1に記載の不定形耐火物用結合剤。
- 前記不定形耐火物用結合剤中に、分散剤及び硬化遅延剤の少なくとも一方が配合されていることを特徴とする、請求項1に記載の不定形耐火物用結合剤。
- 請求項1〜10のいずれか1項に記載の不定形耐火物用結合剤を、耐火骨材に配合してなり、
前記不定形耐火物用結合剤及び前記耐火骨材の合計量を100質量%とした場合に、前記不定形耐火物用結合剤の含有量が、0.3質量%以上かつ20質量%以下であることを特徴とする、不定形耐火物。 - 粒径0.8nm以上1μm以下の超微粉アルミナが含まれ、
前記不定形耐火物用結合剤、前記耐火骨材及び前記超微粉アルミナの合計量を100質量%とした場合に、前記超微粉アルミナの含有量が、70質量%以下であることを特徴とする、請求項11に記載の不定形耐火物。 - 前記不定形耐火物用結合剤及び前記耐火骨材の合計量を100質量%とした場合に、前記不定形耐火物用結合剤の含有量が、0.5質量%以上かつ12質量%以下であることを特徴とする、請求項11に記載の不定形耐火物。
- 更に、分散剤、硬化遅延剤及び硬化促進剤のうちの少なくとも一つが添加されていることを特徴とする、請求項11に記載の不定形耐火物。
- 前記分散剤が、ポリカルボン酸系分散剤、リン酸系分散剤、オキシカルボン酸類、メラミン系分散剤、ナフタレン系分散剤、及びリグニンスルホン酸系分散剤からなる群より選ばれる1種又は2種以上であり、
前記硬化促進剤が、アルカリ金属塩類及びアルミン酸塩の少なくとも一方であり、
前記硬化遅延剤が、ホウ酸類及びケイフッ化物の少なくとも一方であることを特徴とする、請求項14に記載の不定形耐火物。 - 請求項1〜10のいずれか1項に記載の不定形耐火物用結合剤を、粒径1μm以下の超微粉アルミナを含む耐火骨材に配合して混練した後、得られた不定形耐火物を施工する工程を含むことを特徴とする、不定形耐火物の施工方法。
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