JP5910069B2 - 脱硫剤及びその脱硫剤を用いた溶銑の脱硫処理方法、並びに、耐火物を併用した溶銑の脱硫処理方法 - Google Patents
脱硫剤及びその脱硫剤を用いた溶銑の脱硫処理方法、並びに、耐火物を併用した溶銑の脱硫処理方法 Download PDFInfo
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- JP5910069B2 JP5910069B2 JP2011281243A JP2011281243A JP5910069B2 JP 5910069 B2 JP5910069 B2 JP 5910069B2 JP 2011281243 A JP2011281243 A JP 2011281243A JP 2011281243 A JP2011281243 A JP 2011281243A JP 5910069 B2 JP5910069 B2 JP 5910069B2
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- desulfurization
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- 230000003009 desulfurizing Effects 0.000 title claims description 318
- 238000006477 desulfuration reaction Methods 0.000 title claims description 208
- 229910052751 metal Inorganic materials 0.000 title claims description 114
- 239000002184 metal Substances 0.000 title claims description 114
- 239000003795 chemical substances by application Substances 0.000 claims description 182
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Chemical compound 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[Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 136
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 60
- 239000011819 refractory material Substances 0.000 claims description 35
- 239000002245 particle Substances 0.000 claims description 26
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound 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[Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 20
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 14
- 238000007792 addition Methods 0.000 claims description 7
- 239000000395 magnesium oxide Substances 0.000 description 61
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[S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 150000002222 fluorine compounds Chemical class 0.000 description 6
- 230000012447 hatching Effects 0.000 description 5
- 230000001788 irregular Effects 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 230000001965 increased Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials 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- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound 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[Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
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- 229910000514 dolomite Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
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- WUKWITHWXAAZEY-UHFFFAOYSA-L Calcium fluoride Chemical compound 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[F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 230000003028 elevating Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
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- -1 CaF 2 Chemical class 0.000 description 1
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- UIXRSLJINYRGFQ-UHFFFAOYSA-N Calcium carbide Chemical compound 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[Ca+2].[C-]#[C-] UIXRSLJINYRGFQ-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L Calcium hydroxide Chemical compound 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[OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound 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Description
(1)MgOを有する耐火物を含有する、溶銑脱硫処理に用いる脱硫剤であって、前記耐火物は粉粒体状であり、この耐火物の粒径が3mm以下かつ、前記脱硫剤中の前記耐火物の含有率が5質量%以上9質量%以下であり、前記脱硫剤中の含有率が2質量%以上9質量%以下であるMgOと、前記脱硫剤中の含有率が21質量%以下であるAl2O3と、前記脱硫剤中の含有率が70質量%以上98質量%以下であるCaOとを含有することを特徴とする脱硫剤。
(2)前記耐火物はSiO2を有し、前記耐火物中の前記SiO2の含有率が30質量%以下であることを特徴とする上記(1)に記載の脱硫剤。
(3)上記(1)または(2)に記載の脱硫剤を溶銑中に供給して脱硫処理することを特徴とする溶銑の脱硫処理方法。
(4)粒径が3mm以下である粉粒体状の耐火物であって、MgO及びAl2O3を有する耐火物を溶銑に添加するとともに、CaO系脱硫剤を溶銑に添加して、耐火物を併用した溶銑を脱硫する溶銑の脱硫処理方法であって、前記溶銑に添加される前記耐火物と前記CaO系脱硫剤との合計添加量のうち、前記耐火物の含有率が5質量%以上9質量%以下であり、MgOの含有率が2質量%以上9質量%以下であり、Al2O3の含有率が21質量%以下であり、CaOの含有率が70質量%以上98質量%以下であることを特徴とする耐火物を併用した溶銑の脱硫処理方法。
(5)Al2O3源を溶銑に更に添加して、前記耐火物と前記CaO系脱硫剤と更に添加された前記Al2O3源との合計添加量のうちのAl2O3の含有率を調整することを特徴とする上記(4)に記載の耐火物を併用した溶銑の脱硫処理方法。
(6)粒径が3mm以下である粉粒体状の耐火物であって、MgOを有する耐火物とAl2O3源とCaO系脱硫剤を溶銑に添加して、耐火物を併用した溶銑を脱硫する溶銑の脱硫処理方法であって、前記溶銑に添加される耐火物とAl2O3源とCaO系脱硫剤との合計添加量のうち、前記耐火物の含有率が5質量%以上9質量%以下であり、MgOの含有率が2質量%以上9質量%以下であり、Al2O3の含有率が21質量%以下であり、CaOの含有率が70質量%以上98質量%以下であることを特徴とする耐火物を併用した溶銑の脱硫処理方法。
本発明に係る脱硫剤とこの脱硫剤の製造方法とを具体的に説明する。製鉄プロセスなどで使用された後の使用済みの耐火物を用意する。この耐火物には、MgOが含まれている。また、MgO以外に、Al2O3やSiO2が含まれていてもよい。所望の粉砕機を用いて、粒径が3mm以下となるように耐火物を粉砕して、粉粒体状の耐火物を得る。粉粒体状であるCaO系脱硫剤を用意する。必要に応じて、粉粒体状であるAl2O3源やMgO源を適宜用意する。
図2は、本発明の第2実施形態に係る脱硫処理を実施する機械攪拌式脱硫装置の概要図である。図1に示す機械攪拌式脱硫装置と同様の構成要素については、図2に示される符号を、図1での符号と同一とし、かつ、説明を省略する。
(2)脱硫剤中の耐火物の含有率
(3)脱硫剤中のMgOの含有率
(4)脱硫剤中のAl2O3の含有率
(5)脱硫剤中のCaOの含有率
表2に、複数の脱硫剤の組成を示す(本発明例1〜本発明例8及び比較例1〜比較例8)。
各脱硫剤の組成の違いによる脱硫率の影響を調査した。ここで、脱硫率は、脱硫処理前の溶銑中硫黄濃度と脱硫処理後の溶銑中硫黄濃度との差を、脱硫処理前の溶銑中硫黄濃度に対して百分率で表示した値である。溶銑中硫黄濃度は、燃焼赤外線吸収法(JIS G1215−5)を用いて測定した。本発明例1〜本発明例8及び比較例1〜比較例8での脱硫処理前の溶銑中硫黄濃度と脱硫処理後の溶銑中硫黄濃度を測定して、脱硫率を算出した。表2には、本発明例1〜本発明例8及び比較例1〜比較例8での脱硫率の結果も示してある。
当該技術分野では、比較的低温である1200℃の溶銑を12分脱硫したが、本発明を満たす脱硫剤(本発明例11〜18)を用いれば、概ね90%の脱硫率が得られた。一方で、本発明を満たさない脱硫剤(比較例11〜18)を用いると、少なくとも本発明例と同じ脱硫処理時間では、90%に近い脱硫率を得られることはできなかった。このことから、本発明の溶銑の脱硫処理方法によれば、溶銑温度が比較的低温な溶銑に対する脱硫処理に、フッ素化合物を溶銑に添加することなく、耐火物を有効に利用することができ、かつ、効果的な脱硫処理を実施して脱硫率を向上することができるとわかった。
2 容器
3 溶銑
4 インペラー
5 脱硫剤
6,6a,6b,6c,6d 投入シュート
Claims (6)
- MgOを有する耐火物を含有する、溶銑脱硫処理に用いる脱硫剤であって、
前記耐火物は粉粒体状であり、この耐火物の粒径が3mm以下かつ、前記脱硫剤中の前記耐火物の含有率が5質量%以上9質量%以下であり、
前記脱硫剤中の含有率が2質量%以上9質量%以下であるMgOと、
前記脱硫剤中の含有率が21質量%以下であるAl2O3と、
前記脱硫剤中の含有率が70.5質量%以上98質量%以下であるCaOとを含有することを特徴とする脱硫剤。 - 前記耐火物はSiO2を有し、前記耐火物中の前記SiO2の含有率が30質量%以下であることを特徴とする請求項1に記載の脱硫剤。
- 請求項1または請求項2に記載の脱硫剤を溶銑中に供給して脱硫処理することを特徴とする溶銑の脱硫処理方法。
- 粒径が3mm以下である粉粒体状の耐火物であって、MgO及びAl2O3を有する耐火物を溶銑に添加するとともに、CaO系脱硫剤を溶銑に添加して、耐火物を併用した溶銑を脱硫する溶銑の脱硫処理方法であって、
前記溶銑に添加される前記耐火物と前記CaO系脱硫剤との合計添加量のうち、
前記耐火物の含有率が5質量%以上9質量%以下であり、
MgOの含有率が2質量%以上9質量%以下であり、Al2O3の含有率が21質量%以下であり、CaOの含有率が70.5質量%以上98質量%以下であることを特徴とする耐火物を併用した溶銑の脱硫処理方法。 - Al2O3源を溶銑に更に添加して、前記耐火物と前記CaO系脱硫剤と更に添加された前記Al2O3源との合計添加量のうちのAl2O3の含有率を調整することを特徴とする請求項4に記載の耐火物を併用した溶銑の脱硫処理方法。
- 粒径が3mm以下である粉粒体状の耐火物であって、MgOを有する耐火物とAl2O3源とCaO系脱硫剤を溶銑に添加して、耐火物を併用した溶銑を脱硫する溶銑の脱硫処理方法であって、
前記溶銑に添加される耐火物とAl2O3源とCaO系脱硫剤との合計添加量のうち、
前記耐火物の含有率が5質量%以上9質量%以下であり、
MgOの含有率が2質量%以上9質量%以下であり、Al2O3の含有率が21質量%以下であり、CaOの含有率が70.5質量%以上98質量%以下であることを特徴とする耐火物を併用した溶銑の脱硫処理方法。
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