JP7282758B2 - 高ジルコニア含有量を有する溶融ブロックを製造する為の方法 - Google Patents
高ジルコニア含有量を有する溶融ブロックを製造する為の方法 Download PDFInfo
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Description
a)還元条件下で重量百分率で50%超のジルコンを含む投入物を溶融させて、該ジルコンを還元し、そして溶融物質を得ること、
b)該溶融物質に酸化条件を適用すること、
c)該溶融物質をキャスト(鋳造)すること、
d)該溶融物質がブロックの形態で少なくとも部分的に固化するまで冷却すること、
e)任意的に、上記ブロックを加熱処理すること、特にアニーリング加熱処理すること
の逐次工程を含む、上記方法に関する。
工程a)が、該溶融物質中の該シリカ含有量が15%未満になるまで継続される、
工程b)が、該溶融物質中の炭素含有量が500ppm未満になるまで継続される、
工程a)において、該投入物が、該投入物に基づく重量百分率で、70%超、好ましくは80%超、のジルコンを含む、
工程a)において、該投入物が、該投入物に基づく重量百分率で、還元剤、好ましくは炭素、の量が、2.0%超、好ましくは4.0%超、及び/又は10.0%未満、好ましくは8.0%未満、である組成を示す、
該投入物が、該投入物に基づく重量百分率で、0.2%超及び3.0%未満、好ましくは0.5%超及び/又は2.5%未満、好ましくは1.5%未満、の量のアルミナを含む、
該投入物が、該投入物に基づく重量百分率で、0.5%超及び/又は5.0%未満、好ましくは1.0%超及び4.5%未満、の量のナトリウム源、好ましくは炭酸ナトリウム、を含む、
投入物が、該投入物に基づく重量百分率で、1.0%超、好ましくは4.0%超、及び/又は10.0%未満、の合計量の、該ジルコニアの安定化剤を含む。
ZrO2:82.0%超及び97.0%未満、
SiO2:0.5%超及び15.0%未満、
Al2O3:0.2%超、
Na2O:0.1%超、
ZrO2、SiO2、Al2O3及びNa2O以外の酸化物種:10.0%未満、
並びに、より好ましくは、合計100%に対する下記化学組成:
ZrO2:86.0%超、
SiO2:2.5%超、
Al2O3:1.0~3.0%、
Na2O:0.5%未満、
ZrO2、SiO2、Al2O3及びNa2O以外の酸化物種:5.0%未満
を示す。
ブロックは、慣用的に、溶融物質が得られるまで、投入物を溶融し、次に冷却によりこの物質を固化することを用いる方法によってそれが得られた場合、「溶融」されたと言われる。
本発明に従う方法に従って製造されるブロックの組成は、溶融されている投入物だけでなく、それぞれ工程a)及びb)において還元及び酸化条件が適用される条件にも依存する。所望のブロックの組成の関数としての、これらの異なるパラメーターの制御は、当業者に周知である。
ZrO2:82.0%超、好ましくは84.0%超、好ましくは86.0%超、及び/又は97.0%未満、若しくはさらには95.0%未満、若しくはさらには94.0%未満、ZrO2は100%までの残分を構成する、及び/又は
SiO2;0.5%超、好ましくは1.5%超、好ましくは2.5%超、好ましくは4.0%超、若しくはさらには6.0%超、8.0%超、8.5%超、及び/又は15.0%未満、若しくはさらには12.0%未満、10.0%未満、若しくはさらには8.0%未満、及び/又は
Al2O3:0.2%超、好ましくは1.0%超、及び/又は3.0%未満、好ましくは2.0%未満、及び/又は
Na2O:0.1%超、若しくはさらには0.2%超、及び/又は0.6%未満、好ましくは0.5%未満、若しくはさらには0.4%未満、及び/又は
B2O3:0.1%超、若しくはさらには0.2%超、及び/又は0.6%未満、好ましくは0.5%未満、若しくはさらには0.4%未満、及び/又は
ZrO2、SiO2、Al2O3、Na2O及びB2O3以外の酸化物種:10.0%未満、好ましくは9.0%未満、より好ましくは8.0%未満、5.0%未満、若しくはさらには3.0%未満、若しくは2.0%未満、若しくは1.0%未満、若しくは0.5%未満
を示すように変性される。
ジルコンの粒子:60%超、好ましくは70%超、好ましくは80%超、好ましくは85%超、及び/又は
還元剤、好ましくは炭素、の粒子:2.0%超、好ましくは3.0%超、好ましくは4.0%超、若しくはさらには5.0%超、及び/又は10.0%未満、好ましくは8.0%未満、及び/又は
アルミナの粒子:0.2%超、好ましくは0.5%超、若しくはさらには0.8%超、及び/又は好ましくは3.0%未満、好ましくは2.5%未満、好ましくは2.0%未満、若しくはさらには1.5%未満、若しくはさらには1.0%未満、及び/又は
ナトリウム源、好ましくは炭酸ナトリウム、の粒子:0.5%超、好ましくは1.0%超、好ましくは1.5%超、好ましくは2.0%超、若しくはさらには3.0%超、若しくはさらには3.5%超、及び/又は好ましくは5.0%未満、好ましくは4.5%未満、若しくはさらには4.0%未満、及び/又は
酸化ホウ素の粒子:0.5%超、若しくはさらには1.0%超、若しくはさらには1.5%超、若しくはさらには2.0%超、及び/又は好ましくは5.0%未満、好ましくは4.0%未満、若しくはさらには3.0%未満、及び/又は
他の粒子、すなわち、ジルコン、還元剤、アルミナ、ナトリウム源及び酸化ホウ素の粒子以外:10%未満、好ましくは5%未満、若しくはさらには3%未満、若しくはさらには1%未満、若しくはさらには0.5%未満、若しくはさらには0.1%未満
を示す。
工程d)で得られるブロックは好ましくは、80%超、好ましくは85%超、のジルコニアを含む。
下記の原材料が、これらの実施例で用いられた:
33%シリカを含有するジルコンサンド(zircon sand)、
Pechiney社によって販売され、平均で99.4%のアルミナを含有するAC44型アルミナ、
Na2O源である、炭酸ナトリウム、
およそ98%の炭素を含む、ピッチコークス(pitch coke)。
Claims (15)
- 酸化物に基づく重量百分率で、80%超のジルコニアを含む耐火ブロックを製造する為の方法であって、
a)還元条件下で投入物に基づく重量百分率で50%超のジルコンを含む投入物を溶融させて、該ジルコンを還元し、そして溶融物質を得ること、
b)該溶融物質に酸化条件を適用すること、
c)該溶融物質を鋳造すること、
d)該溶融物質が10kg超の重量を示すように構成されるブロックの形態で少なくとも部分的に固化するまで冷却すること、
の逐次工程を含み、
前記投入物は、一方ではアルミナの粒子、並びに他方ではナトリウム源の粒子及び/又はホウ素源の粒子を含むこと、
該方法のパラメーターは、工程d)で得られる該ブロックが2.5%超のSiO 2 を示すようにし、前記ジルコニアはZrO 2 の結晶相を表す、前記方法。 - 工程a)が、該溶融物質中の該シリカ含有量が15%未満になるまで継続され、且つ工程b)が、該溶融物質中の炭素含有量が500ppm未満になるまで継続される、請求項1に記載の方法。
- 該投入物が、該投入物に基づく重量百分率で、80%超のジルコンを含む、請求項1又は2に記載の方法。
- 該投入物が、該投入物に基づく重量百分率で、還元剤の量が2.0%超及び10.0%未満である組成を示す、請求項1~3のいずれか1項に記載の方法。
- 前記還元剤の該量が、4.0%超及び8.0%未満である、請求項4に記載の方法。
- 該投入物が、該投入物に基づく重量百分率で、0.2%超及び3.0%未満の量のアルミナを含む、請求項1~5のいずれか1項に記載の方法。
- アルミナの該量が、0.5%超及び2.5%未満である、請求項6に記載の方法。
- アルミナの該量が、1.5%未満である、請求項6又は7に記載の方法。
- 該投入物が、該投入物に基づく重量百分率で、0.5%超及び5.0%未満の量のナトリウム源を含む、請求項1~8のいずれか1項に記載の方法。
- ナトリウム源の該量が、1.0%超及び4.5%未満である、請求項9に記載の方法。
- 該投入物が、1.0%超及び10.0%未満の合計量の、該ジルコニアの安定化剤を含む、請求項1~10のいずれか1項に記載の方法。
- 該投入物が、4.0%超の合計量の、該ジルコニアの安定化剤を含む、請求項11に記載の方法。
- 工程d)で得られる該ブロックが、合計100%に対する下記化学組成:
ZrO2:82.0%超及び97.0%未満、
SiO2:0.5%超及び15.0%未満、
Al2O3:0.2%超、
Na2O:0.1%超、
ZrO2、SiO2、Al2O3及びNa2O以外の酸化物種:10.0%未満
を示すように、該投入物が構成される、請求項1~12のいずれか1項に記載の方法。 - 工程d)で得られる該ブロックが、合計100%に対する化学組成:
ZrO2:86.0%超、
SiO2:2.5%超、
Al2O3:1.0~3.0%、
Na2O:0.5%未満、
ZrO2、SiO2、Al2O3及びNa2O以外の酸化物種:5.0%未満
を示すように、該投入物が構成される、請求項13に記載の方法。 - 周囲温度及び重量百分率で、上記ブロックのジルコニアの80%超が単斜晶である、又はジルコニアの25%超が正方晶であるように構成される、請求項1~14のいずれか1項に記載の方法。
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JP2020536834A (ja) | 2020-12-17 |
CN111201209A (zh) | 2020-05-26 |
EP3694822B1 (fr) | 2023-07-19 |
US11634362B2 (en) | 2023-04-25 |
FR3072092B1 (fr) | 2021-11-12 |
WO2019072799A1 (fr) | 2019-04-18 |
FR3072092A1 (fr) | 2019-04-12 |
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