JP2020055710A - 熱間用乾式吹付材及び熱間乾式吹付施工方法 - Google Patents
熱間用乾式吹付材及び熱間乾式吹付施工方法 Download PDFInfo
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- JP2020055710A JP2020055710A JP2018187646A JP2018187646A JP2020055710A JP 2020055710 A JP2020055710 A JP 2020055710A JP 2018187646 A JP2018187646 A JP 2018187646A JP 2018187646 A JP2018187646 A JP 2018187646A JP 2020055710 A JP2020055710 A JP 2020055710A
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- limestone
- hot working
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- 239000000463 material Substances 0.000 title claims abstract description 47
- 239000007921 spray Substances 0.000 title claims abstract description 32
- 238000010276 construction Methods 0.000 title abstract description 25
- 238000005507 spraying Methods 0.000 claims abstract description 53
- 235000019738 Limestone Nutrition 0.000 claims abstract description 47
- 239000006028 limestone Substances 0.000 claims abstract description 46
- 239000011230 binding agent Substances 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011819 refractory material Substances 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 15
- 230000007797 corrosion Effects 0.000 abstract description 15
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 14
- 239000000395 magnesium oxide Substances 0.000 abstract description 7
- 230000009970 fire resistant effect Effects 0.000 abstract 3
- 239000002893 slag Substances 0.000 description 16
- 238000011156 evaluation Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
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- 230000035515 penetration Effects 0.000 description 6
- 238000004898 kneading Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
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- 239000011449 brick Substances 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 239000001095 magnesium carbonate Substances 0.000 description 3
- 235000014380 magnesium carbonate Nutrition 0.000 description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 3
- 239000010445 mica Substances 0.000 description 3
- 229910052618 mica group Inorganic materials 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000011822 basic refractory Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
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- 239000010450 olivine Substances 0.000 description 2
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- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 2
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- 239000004111 Potassium silicate Substances 0.000 description 1
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- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
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- 229910052839 forsterite Inorganic materials 0.000 description 1
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- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
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- 235000010994 magnesium phosphates Nutrition 0.000 description 1
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- 235000019353 potassium silicate Nutrition 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
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- 239000001488 sodium phosphate Substances 0.000 description 1
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- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
Classifications
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Abstract
Description
なお、「熱間」とは被施工面の温度が概ね600℃以上の環境のことをいう。
耐火原料とバインダーとを含む熱間用乾式吹付材であって、
前記耐火材料及び前記バインダーの合量100質量%中において、粒径0.075mm以上1mm未満の苦土石灰石を10質量%以上50質量%以下含み、
前記耐火原料及びバインダーの合量100質量%中において、粒径0.075mm未満の苦土石灰石の含有量が35質量%以下(0を含む。)である、熱間用乾式吹付材。
耐火材料及びバインダーを含む配合物を、配管を通じて吹付ノズルに向けて圧送し、前記吹付ノズルの先端部において水を添加して熱間で吹き付ける熱間乾式吹付施工方法において、
前記配合物は、前記耐火材料及び前記バインダーの合量100質量%中において、粒径0.075mm以上1mm未満の苦土石灰石を10質量%以上50質量%以下含み、
前記耐火原料及びバインダーの合量100質量%中において、粒径0.075mm未満の苦土石灰石の含有量が35質量%以下(0を含む。)である、熱間乾式吹付施工方法。
中粒の苦土石灰石の含有量が10質量%未満であると、スラグ浸透抑制効果(耐スラグ浸透性向上効果)が十分には発揮されず、十分な耐食性向上効果が得られない。一方、苦土石灰石の含有量が50質量%を超えると、脱ガス反応により空隙(開放気孔)が過剰に生成され、結果としてスラグ浸透が助長されて耐食性が低下する。
中粒の苦土石灰石の含有量は、合量100質量%中において20質量%以上40質量%以下であることが好ましい。
ここで、微粒の苦土石灰石も前述の脱ガス反応によりCaOを生成するが、このCaOは、水との接触面積の大きい微粒の苦土石灰石より生成することから水和反応(CaO+2H2O→Ca2++2OH−)を起こしやすく、この水和反応により生じたCa2+がバインダー等と反応して吹付施工体のマトリクス部の結合強化(高強度化)に寄与すると考えられ、前述の高融点組成物生成には寄与しないと考えられる。
ただし、微粒の苦土石灰石を多量に含むと、前述のマトリクス部の結合強化(高強度化)作用よりも、前述の脱ガス反応による影響(空隙形成の影響)が強くなり、マトリックス部に空隙が過剰に生成され、結果として吹付施工体強度の著しい低下を招くと共に耐食性の低下も招くことになる。したがって、微粒の苦土石灰石の含有量は、合量100質量%中において35質量%以下(0を含む。)とする。
なお、バインダーには添加剤を使用してもよい。添加剤としては、硬化剤、分散剤、増粘剤などの各種の添加剤を使用することができる。例えば、硬化剤としては消石灰、分散剤としてはリン酸塩、増粘剤としては粘土を使用することができる。
水の添加量は、一般的な熱間乾式吹付施工方法と同様でよく、例えば合量100質量%に対して外掛けで10質量%以上40質量%以下である。
評価項目と評価方法は、以下のとおりである。
各例の熱間用乾式吹付材を吹付ノズルから15kg/分の吹付量で、被施工面として1000℃に加熱されたマグネシアれんがの表面に向けて1分間吹き付けた。このとき、吹付ノズルの先端部において添加する水の添加量は、合量100質量%に対して外掛けで20質量%とした。
1分間の吹付実施により概ね50mm厚の吹付材の施工体を含む吹付施工体が得られた。この吹付施工体から切り出した所定寸法の試料を、回転侵食試験機を用い、C/S=1.0の合成スラグを侵食剤として、1650〜1700℃で3時間侵食させた。各例の最大溶損量を測定し、実施例1の最大溶損量を100とした相対量を求めた。この相対量が小さいほど耐食性(耐スラグ浸透性)が高いということである。耐食性の評価では、この相対量が100以下の場合を◎(良)、100超110以下の場合を○(可)、110超の場合を×(不可)とした。
前述の要領で得た各例の吹付施工体から切り出した所定寸法の試料について、JISR2575に従い常温での圧縮強度を測定し、実施例1の圧縮強度を100とした相対値を求めた。この相対値が大きいほど吹付施工体強度が高いということである。吹付施工体強度の評価では、この相対値が80以上の場合を◎(良)、70以上80未満の場合を○(可)、70未満の場合を×(不可)とした。
図1の上段に示すように、ヨーカン形状のマグネシアれんがの中央に15mmの間隔を設け、その間に各例の吹付材に水(合量100質量%に対して外掛けで20質量%)を添加して混練したものを鋳込み、養生、乾燥後、図1の下段に示すようにヨーカンの先端より0.25MPaの荷重をかけた状態で1400℃で3時間焼成して試験片を得た。各例の試験片について接着面の曲げ強さを3点曲げ試験により測定し、実施例1の曲げ強さを100とした相対値を求めた。この相対値が大きいほど接着性が高いということである。接着性の評価では、この相対値が100以上の場合を◎(良)、60超100未満の場合を○(可)とした。
この接着性の評価は、実際の吹付施工において、吹付後に工業窯炉が稼働した後の吹付材と被施工面との接着強度を表す指標となる。
前述の各評価において、全て◎の場合を◎(良)、×がなく、いずれかに○がある場合を○(可)、いずれか一つが×の場合を×(不可)とした。この総合評価は、実際の吹付施工体の耐用性を表す指標となる。
比較例2は中粒の苦土石灰石の含有量が多い例である。前述の脱ガス反応により空隙(開放気孔)が過剰に生成されてスラグ浸透が助長され、結果として耐食性の評価が×(不可)となった。
比較例3は微粒の苦土石灰石の含有量が多い例である。前述の脱ガス反応による影響により、マトリックス部に空隙が過剰に生成され、結果として耐食性及び吹付施工体強度の評価が×(不可)となった。
耐火材料とバインダーとを含む熱間用乾式吹付材であって、
前記耐火材料及び前記バインダーの合量100質量%中において、粒径0.075mm以上1mm未満の苦土石灰石を10質量%以上50質量%以下含み、
前記耐火材料及びバインダーの合量100質量%中において、粒径0.075mm未満の苦土石灰石の含有量が35質量%以下(0を含む。)である、熱間用乾式吹付材。
耐火材料及びバインダーを含む配合物を、配管を通じて吹付ノズルに向けて圧送し、前記吹付ノズルの先端部において水を添加して熱間で吹き付ける熱間乾式吹付施工方法において、
前記配合物は、前記耐火材料及び前記バインダーの合量100質量%中において、粒径0.075mm以上1mm未満の苦土石灰石を10質量%以上50質量%以下含み、
前記耐火材料及びバインダーの合量100質量%中において、粒径0.075mm未満の苦土石灰石の含有量が35質量%以下(0を含む。)である、熱間乾式吹付施工方法。
Claims (4)
- 耐火原料とバインダーとを含む熱間用乾式吹付材であって、
前記耐火材料及び前記バインダーの合量100質量%中において、粒径0.075mm以上1mm未満の苦土石灰石を10質量%以上50質量%以下含み、
前記耐火原料及びバインダーの合量100質量%中において、粒径0.075mm未満の苦土石灰石の含有量が35質量%以下(0を含む。)である、熱間用乾式吹付材。 - 前記バインダーは、リン酸塩及び珪酸塩の中から選択される少なくとも1種を含むものである、請求項1に記載の熱間用乾式吹付材。
- 前記粒径0.075mm未満の苦土石灰石の含有量が5質量%以上35質量%以下である、請求項1又は2に記載の熱間用乾式吹付材。
- 耐火材料及びバインダーを含む配合物を、配管を通じて吹付ノズルに向けて圧送し、前記吹付ノズルの先端部において水を添加して熱間で吹き付ける熱間乾式吹付施工方法において、
前記配合物は、前記耐火材料及び前記バインダーの合量100質量%中において、粒径0.075mm以上1mm未満の苦土石灰石を10質量%以上50質量%以下含み、
前記耐火原料及びバインダーの合量100質量%中において、粒径0.075mm未満の苦土石灰石の含有量が35質量%以下(0を含む。)である、熱間乾式吹付施工方法。
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WO2023013284A1 (ja) * | 2021-08-06 | 2023-02-09 | 黒崎播磨株式会社 | 焼成炉用の乾式吹付材 |
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