JP5706615B2 - 耐火物粒子の製造方法 - Google Patents
耐火物粒子の製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 59
- 238000002844 melting Methods 0.000 claims description 103
- 230000008018 melting Effects 0.000 claims description 103
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 70
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- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- 239000000126 substance Substances 0.000 claims description 21
- 239000000155 melt Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 14
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 30
- 238000006722 reduction reaction Methods 0.000 description 28
- 239000003513 alkali Substances 0.000 description 17
- 229910052742 iron Inorganic materials 0.000 description 17
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 13
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
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- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
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Description
2:溶融電極
3:溶融物
4:出湯口
5:ノズル
6:圧縮空気
7:粒子
8:捕集箱
なお、本明細書では、高純度化とはZrO2成分及び/又はAl2O3成分の含有量を増加させ、他の成分を減少させることをいう。
また、耐火物とはセラミックスとほぼ同じ意味で使用するものとし、また、電鋳耐火物とは電気溶融鋳造プロセスで製造された耐火物を総称していう。
使用済み耐火物としては、ガラス溶解窯で使用したAZS系電鋳耐火物100kgを用い、化学成分がAl2O3:44.95%、SiO2:14.8%、ZrO2:37.6%、Na2O:1.4%、K2O:0.89%、Fe2O3:0.19%、TiO2:0.07%、CaO:0.07%、MgO:0.03%、C:0%であった。粒径は、ふるい目開きで30mmを通過するもの(粒径30mm以下)であった。
また、実施例である例2〜5ではSiO2成分の削減率は67.6%〜98.9%、アルカリ成分の削減率は87.8%〜99.6%、Fe2O3削減率は57.9%〜94.7%であった。
別の使用済みAZS系電鋳耐火物(化学成分がAl2O3:51.39%、SiO2:12.0%、ZrO2:32.8%、Na2O:1.9%、K2O:0.11%、Fe2O3:0.15%、TiO2:0.07%、CaO:0.06%、MgO:0.03%、Co2O3:0.50%、NiO:0.49%、ZnO:0.50%)を使用済み耐火物原料として使用し、原料100kg、カーボン添加量4%、溶融時間90分、平均電圧160V、平均電力320kw、溶融電力量500kwhの条件で実施した。
原料に供する使用済み耐火物として、ガラス溶解窯で使用されたZ系電鋳耐火物(化学成分がAl2O3:0.65%、SiO2:4.9%、ZrO2:93.26%、Na2O:0.71%、K2O:0.09%、Fe2O3:0.25%、TiO2:0.07%、CaO:0.05%、MgO:0.02%、及び粒径は、ふるい目開きで30mmを通過)を用い、原料100kg、カーボン添加量5%、溶融時間120分、平均電圧160V、平均電力275kw、溶融電力量550kwhの条件で、本製造法を適用した。
原料100kg、溶融時間90分、平均電圧160V、平均電力320kw、溶融電力量480kwhの条件で、カーボン粒子添加量5%において、カーボン粒子の粒径を変更した以外は条件を一定として本製造法を実施し、使用するカーボン粒子の最適な粒径の確認を行った。その結果を表3に示す。
原料100kg、溶融時間90分、平均電圧160V、平均電力320kw、溶融電力量480kwhの条件で、カーボン粒子添加量5%において、AZS系電鋳耐火物の場合(3)において最適であった粒径のカーボン粒子を選定し、溶融を安定できる溶融用混合原料の最適な投入間隔の確認を行った。カーボン粒子の大きさ、溶融用混合原料の投入間隔を変更した以外は条件を一定とした。
AZS系電鋳耐火物を製造する際に発生する廃棄物である研磨屑を使用済み耐火物の原料として高純度化を試みた。
条件は、原料100kg、カーボン添加量5%、溶融時間90分、平均電圧160V、平均電力320kw、溶融電力量480kwhの条件で溶融を実施した。
使用済みAS系電鋳耐火物(化学成分がAl2O3:92.16%、SiO2:2.3%、ZrO2:0.0%、Na2O:3.9%、K2O:1.1%、Fe2O3:0.05%、TiO2:0.04%、CaO:0.4%、MgO:0.05%)、を使用済み耐火物原料として使用し、溶融炉の内張耐火物を汚染のないAS系電鋳耐火物に交換したほかは原料100kg、カーボン添加量3%、溶融時間80分、平均電圧140V、平均電力300kw、溶融電力量400kwhの条件で溶融を実施した。
使用済みAZS系結合耐火物(化学成分がAl2O3:52.54%、SiO2:14.5%、ZrO2:31.8%、Na2O:0.5%、K2O:0.1%、Fe2O3:0.18%、TiO2:0.15%、CaO:0.12%、MgO:0.11%)を使用済み耐火物原料として使用し、原料100kg、カーボン添加量5%、溶融時間90分、平均電圧160V、平均電力320kw、溶融電力量480kwhの条件で溶融を実施した。
なお、2007年12月6日に出願された日本特許出願2007−316416号の明細書、特許請求の範囲、図面及び要約書の全内容をここに引用し、本発明の明細書の開示として、取り入れるものである。
Claims (10)
- 化学成分として、質量%で、ZrO2及び/又はAl2O3:75〜97%、SiO2:2〜25%、Na2O、K2O及びLi2Oを合量(Na2O+K2O+Li2O)で:0.4〜7%、CaO:2%以下、MgO:2%以下、を含有する使用済み耐火物と、該使用済み耐火物に対して外掛の質量%で1〜8%である粒径1mm〜10mmのカーボン粒子とを、溶融炉に投入しながら溶融し、溶融後、溶融物を出湯しながら圧縮空気を吹付けて、ZrO2及び/又はAl2O3の含有量を増加させた耐火物粒子とする耐火物粒子の製造方法。
- 前記使用済み耐火物と前記カーボン粒子とを溶融炉に投下する前に添加・混合して溶融用混合原料とし、次に、前記溶融用混合原料を溶融炉に投入する請求項1に記載の耐火物粒子の製造方法。
- 前記溶融用混合原料の溶融炉への投入回数が、5回以上である請求項2に記載の耐火物粒子の製造方法。
- 前記溶融用混合原料の溶融炉への投入間隔が20分以下である請求項2又は3に記載の耐火物粒子の製造方法。
- 圧縮空気と同時に水を吹付ける請求項1〜4のいずれかに記載の耐火物粒子の製造方法。
- 前記耐火物粒子中のカーボン含有量が200ppm以下である請求項1〜5のいずれかに記載の耐火物粒子の製造方法。
- 前記耐火物粒子の90質量%以上が、粒子直径15mm以下である請求項1〜6のいずれかに記載の耐火物粒子の製造方法。
- 前記耐火物粒子のFe2O3含有量が0.1%以下である請求項1〜7のいずれかに記載の耐火物粒子の製造方法。
- 前記耐火物粒子のSiO2成分の前記使用済み耐火物のSiO2成分に対する削減率が75%以上である請求項1〜8のいずれかに記載の耐火物粒子の製造方法。
- 前記耐火物粒子のNa2O、K2O及びLi2Oの含有量が合量(Na2O+K2O+Li2O)で0.3%以下である請求項1〜9のいずれかに記載の耐火物粒子の製造方法。
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