JP6456857B2 - 不定形耐火物用粒子 - Google Patents
不定形耐火物用粒子 Download PDFInfo
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- JP6456857B2 JP6456857B2 JP2016015053A JP2016015053A JP6456857B2 JP 6456857 B2 JP6456857 B2 JP 6456857B2 JP 2016015053 A JP2016015053 A JP 2016015053A JP 2016015053 A JP2016015053 A JP 2016015053A JP 6456857 B2 JP6456857 B2 JP 6456857B2
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- 239000002245 particle Substances 0.000 title claims description 119
- 230000001788 irregular Effects 0.000 title claims description 30
- 239000011819 refractory material Substances 0.000 title description 23
- 239000011148 porous material Substances 0.000 claims description 65
- 229910052596 spinel Inorganic materials 0.000 claims description 17
- 239000011029 spinel Substances 0.000 claims description 17
- 238000009826 distribution Methods 0.000 claims description 15
- 229910020068 MgAl Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 230000000052 comparative effect Effects 0.000 description 15
- 239000000463 material Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/16—Preparation of alkaline-earth metal aluminates or magnesium aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/162—Magnesium aluminates
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- C04B35/443—Magnesium aluminate spinel
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Description
本発明の不定形耐火物用粒子は、化学式MgAl2O4で表されるスピネル質の多孔質焼結体からなり、この粒子における孔径10μm以下の気孔の内、孔径0.01μm以上0.8μm未満の気孔が10vol%以上50vol%以下を占めており、かつ、粒子径45μm未満の粒子が60vol%以下、粒子径45μm以上100μm未満の粒子が20vol%以上60vol%以下、粒子径100μm以上1000μm以下の粒子が10vol%以上50vol%以下となる粒度分布を有する。
(実施例1〜6、比較例1〜3)
水硬性アルミナ粉末(BK−112;住友化学株式会社製)11molに対して、酸化マグネシウム粉末(MGO11PB;株式会社高純度化学研究所製)9molの割合で混合し、これに純水を加え、均一に分散させてスラリーを調製した。そして、造孔材を前記スラリーに対して0〜50vol%の範囲で混合し、成形および乾燥し、大気中1600℃で3時間焼成後、これらの多孔質焼結体を得た。
下記表1の実施例1〜6、比較例1〜3にそれぞれ示すような気孔構成は、スラリーを調製する際の純水添加量や造孔材として用いたアクリル樹脂粒子の径及び添加量等を適宜変更することにより調整した。
(実施例1a〜6a)
実施例1〜6の粒子を60wt%、粒径1〜5mmの中空アルミナ粒子を25wt%、アルミナセメントを15wt%、分散剤として微量のヘキサメタリン酸ナトリウムを水と共に混合し、200mm×100mm×50mmの形状に注型成形した。得られた成形体を110℃×20時間乾燥させ、乾燥体とした。乾燥体は1550℃×3時間の大気焼成を行い、実施例1a〜6aのキャスタブル耐火物とした。
そして、比較例1〜3の粒子を60wt%、粒径1〜5mmの中空アルミナ粒子を25wt%、アルミナセメントを15wt%、分散剤として微量のヘキサメタリン酸ナトリウムを水と共に混合し、200mm×100mm×50mmの形状に注型成形した。得られた成形体を110℃×20時間乾燥させ、乾燥体とした。乾燥体は1550℃×3時間の大気焼成を行い、比較例1a〜3aのキャスタブル耐火物を作製した。
また、アルミナ85wt%、シリカを5wt%含有する市販の断熱キャスタブル用粉末30wt%、実施例1の粒子70wt%をそれぞれ乾式混合した上で水を添加し、ミキサーで均一になるまで攪拌して200mm×100mm×50mmの形状に注型成形した。得られた成形体を110℃×20時間乾燥させ、乾燥体とした。乾燥体は1550℃×3時間の大気焼成を行い、実施例7のキャスタブル耐火物とした。
更に、アルミナ85wt%、シリカを5wt%含有する市販の断熱キャスタブル用粉末に、水を添加し、ミキサーで均一になるまで攪拌して200mm×100mm×50mmの形状に注型成形した。得られた成形体を110℃×20時間乾燥させ、乾燥体とした。乾燥体は1550℃×3時間の大気焼成を行い、比較例4のキャスタブル耐火物とした。
Claims (1)
- 化学式MgAl2O4で表されるスピネル質の多孔質焼結体からなる不定形耐火物用粒子であって、
前記不定形耐火物用粒子における孔径10μm以下の気孔の内、孔径0.01μm以上0.8μm未満の気孔が10vol%以上50vol%以下を占めており、かつ、
粒子径45μm未満の粒子が60vol%以下、粒子径45μm以上100μm未満の粒子が20vol%以上60vol%以下、粒子径100μm以上1000μm以下の粒子が10vol%以上50vol%以下となる粒度分布を有することを特徴とする不定形耐火物用粒子。
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