JP5361795B2 - Lined casting material - Google Patents
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- JP5361795B2 JP5361795B2 JP2010111605A JP2010111605A JP5361795B2 JP 5361795 B2 JP5361795 B2 JP 5361795B2 JP 2010111605 A JP2010111605 A JP 2010111605A JP 2010111605 A JP2010111605 A JP 2010111605A JP 5361795 B2 JP5361795 B2 JP 5361795B2
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- 239000000463 material Substances 0.000 title claims description 81
- 238000005266 casting Methods 0.000 title claims description 62
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 110
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 96
- 239000002245 particle Substances 0.000 claims description 64
- 239000000395 magnesium oxide Substances 0.000 claims description 48
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 27
- 239000000843 powder Substances 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 19
- 239000004568 cement Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000002270 dispersing agent Substances 0.000 claims description 3
- 239000004088 foaming agent Substances 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 description 22
- 238000005260 corrosion Methods 0.000 description 22
- 239000002893 slag Substances 0.000 description 21
- 239000011029 spinel Substances 0.000 description 16
- 229910052596 spinel Inorganic materials 0.000 description 16
- 230000035515 penetration Effects 0.000 description 13
- 239000011819 refractory material Substances 0.000 description 11
- 238000010276 construction Methods 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004901 spalling Methods 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 235000013312 flour Nutrition 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 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
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- -1 porphyry Inorganic materials 0.000 description 2
- 239000011214 refractory ceramic Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910019064 Mg-Si Inorganic materials 0.000 description 1
- 229910019406 Mg—Si Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 229910052851 sillimanite Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- Ceramic Products (AREA)
Description
本発明は、製鋼用内張り流し込み材に関し、特に、耐スラグ浸透性に優れた溶鋼取鍋用内張り流し込み材に関する。 The present invention relates to a lining cast material for steel making, and in particular, to a lining cast material for a molten steel ladle having excellent slag penetration resistance.
近年、溶鋼取鍋の内張り用不定形耐火物として、アルミナ原料とスピネル原料とを組み合わせたアルミナ・スピネル質流し込み材や、アルミナ質流し込み材にマグネシア原料を添加したアルミナ・マグネシア質流し込み材が開発されている。例えば、特許文献１には、Ａｌ２Ｏ３成分が６５〜８５ｗｔ％、ＭｇＯ成分が５〜２５ｗｔ％、その他ＳｉＯ２成分３０ｗｔ％以下からなる高アルミナ質流し込み材において、粒径１ｍｍ未満の材料のＡｌ２Ｏ３／（Ａｌ２Ｏ３＋ＳｉＯ２）の成分比が０．８０〜０．９５であることを特徴とする特殊精錬取鍋用高アルミナ質流し込み材（請求項１）；前記高アルミナ質流し込み材にアルミナセメント、耐火粘土、シリカ超微粉および珪酸ガラスから選ばれた１種ないし２種以上の物質をバインダーとして添加してなる特殊精錬取鍋用高アルミナ質流し込み材（請求項２）；バインダーの添加量が２〜１５ｗｔ％である請求項（２）の特殊精錬取鍋用高アルミナ質流し込み材が開示されている。 In recent years, as an irregular refractory for the ladle of molten steel ladle, an alumina / spinel casting material, which is a combination of an alumina material and a spinel material, and an alumina / magnesia casting material, in which an magnesia material is added to an alumina casting material, have been developed. ing. For example, Patent Document 1 discloses that a high alumina-based casting material having an Al 2 O 3 component of 65 to 85 wt%, an MgO component of 5 to 25 wt%, and other SiO 2 components of 30 wt% or less has a particle size of less than 1 mm. A high-alumina casting material for a special smelting ladle characterized in that the component ratio of Al 2 O 3 / (Al 2 O 3 + SiO 2 ) is 0.80 to 0.95 (claim 1); A high-alumina casting material for a special smelting ladle comprising one or more substances selected from alumina cement, refractory clay, ultrafine silica powder and silicate glass as a binder. A high-alumina casting material for a special refining ladle according to claim 2 wherein the amount of binder added is 2 to 15 wt%.
また、特許文献２には、非晶質シリカ微粒子が０．３〜５重量％、高アルミナセメントが０．５〜４重量％、残部がアルミナからなる鍋用不定形耐火物（請求項１）；非晶質シリカ粒子が０．３〜３重量％、高アルミナセメントが０．５〜４重量％、スピネル若しくはマグネシアがＭｇＯ組成に換算して２〜１５重量％、残部がアルミナからなる鍋用不定形耐火物（請求項３）が開示されている。 Patent Document 2 discloses an amorphous refractory for pots comprising amorphous silica fine particles of 0.3 to 5% by weight, high alumina cement of 0.5 to 4% by weight, and the balance of alumina. ; 0.3 to 3% by weight of amorphous silica particles, 0.5 to 4% by weight of high alumina cement, 2 to 15% by weight of spinel or magnesia in terms of MgO composition, and the balance for alumina An amorphous refractory (Claim 3) is disclosed.
更に、特許文献３には、１５０メッシュ以下のマグネシア系原料４〜２５ｗｔ％と粒径５μｍ以下のシリカ系原料０．５〜５ｗｔ％および残部がアルミナ系原料、アルミナセメントと必要に応じた特性を付与するための耐火性材料より成る耐火物原料であり、該耐火物原料１００ｗｔ％において、ＭｇＯ含有量が３〜２５ｗｔ％であり、ＳｉＯ２含有量が０．５〜６ｗｔ％であることを特徴とする溶融金属容器内張り用不定形耐火物（請求項１）が開示されている。 Further, Patent Document 3 describes that magnesia-based raw materials of 4 to 25 wt% with a mesh size of 150 mesh or less, silica-based raw materials of 0.5 to 5 wt% with a particle size of 5 μm or less, and the balance of alumina raw materials, alumina cement, and other properties as required. a refractory material made of refractory material for imparting, in the refractory feedstock 100 wt%, MgO content is 3～25Wt%, wherein the SiO 2 content of 0.5～6Wt% An amorphous refractory for a molten metal container lining (Claim 1) is disclosed.
また、特許文献４には、耐火材の組成において、粒子径０．１５ｍｍ以下の部分が、Ａｌ２Ｏ３含有率９８重量％以上のアルミナ質原料とＭｇＯ含有率９５重量％以上のマグネシア質原料の混合物からなり、かつ、前記粒子径０．１５ｍｍ以下の部分の化学組成が、Ａｌ２Ｏ３：６５〜８５重量％、ＭｇＯ：１５〜３５重量％の範囲にあるとともに、全体の３〜１２重量％を占める平均粒子径５μｍ以下のアルミナ質原料の少なくとも一部を構成している耐火材に対して、シリカフラワーを外掛けで２重量％以下の割合で添加したことを特徴とする流し込み不定形耐火物が開示されている。また、特許文献４の［００１７］段落には、「シリカフラワーを添加することにより、高温下での熱間膨張を抑制し、熱間での塑性変形により熱応力を緩和できること、及び高温下での変形量を減少させることが可能になることによる。すなわち、シリカフラワーを添加することにより、１３００〜１７００℃の温度で処理した後の組織の均一性を向上させることが可能になるとともに、加熱・冷却に伴う膨張・収縮などの熱間特性を制御して施工体の亀裂や剥離の発生を抑制することが可能になることによる。」旨の記載がある。 In Patent Document 4, in the composition of the refractory material, an alumina raw material having an Al 2 O 3 content of 98% by weight or more and a magnesia raw material having an MgO content of 95% by weight or more are included. And the chemical composition of the portion having a particle diameter of 0.15 mm or less is in the range of Al 2 O 3 : 65 to 85% by weight, MgO: 15 to 35% by weight, and 3 to 12 in total. A non-pourable composition characterized by adding silica flour at a ratio of 2% by weight or less on the outer surface to a refractory material constituting at least part of an alumina raw material having an average particle diameter of 5 μm or less occupying 5% by weight. A fixed refractory is disclosed. In addition, the paragraph [0017] of Patent Document 4 states that “by adding silica flour, it is possible to suppress hot expansion at high temperature and relieve thermal stress by hot plastic deformation, and at high temperature. In other words, by adding silica flour, it is possible to improve the uniformity of the tissue after treatment at a temperature of 1300 to 1700 ° C. and heating. "It is possible to control the hot characteristics such as expansion / contraction associated with cooling to suppress the occurrence of cracks and peeling of the construction body."
これらのアルミナ・マグネシア質流し込み材は、使用中にアルミナとマグネシアが反応して２次スピネルを生成することで材料組織が緻密化するため、予めスピネルを添加したアルミナ・スピネル質流し込み材よりもスラグに対する耐食性に優れることから、取鍋内張り用材質として広く適用されている。 These alumina and magnesia castings react with alumina and magnesia during use to produce secondary spinel, so that the material structure becomes denser. It is widely applied as a ladle lining material because of its excellent corrosion resistance.
また、不定形耐火物に中空アルミナ粒子を使用することも提案されている。例えば、特許文献５には、アルミナ質材料１０〜９０重量％及びマグネシア質材料９０〜１０重量％からなる耐火物原料１００重量部及び造粒処理した電融アルミナ中空粒３〜１５重量部を含有する誘導炉用乾式ラミング材が開示されている。 It has also been proposed to use hollow alumina particles for amorphous refractories. For example, Patent Document 5 contains 100 parts by weight of a refractory material consisting of 10 to 90% by weight of an alumina material and 90 to 10% by weight of a magnesia material and 3 to 15 parts by weight of granulated fused alumina hollow particles. A dry ramming material for an induction furnace is disclosed.
また、特許文献６には、アルミナ−スピネル質流し込み耐火物であって、耐火物中に粒子径０．３〜３ｍｍの中空粒子が２．５〜１２ｗｔ％含まれ、かつ耐火物の見掛け気孔率が２０〜３２％であることを特徴とする取鍋内張り用耐火物（請求項１）；耐火物中の中空粒子が電融されてなる中空粒子である取鍋内張り用耐火物（請求項４）；中空粒子がアルミナ質のものである取鍋内張り用耐火物（請求項５）が開示されている。 Patent Document 6 discloses a refractory material poured into alumina-spinel, which contains 2.5 to 12 wt% of hollow particles having a particle diameter of 0.3 to 3 mm, and the apparent porosity of the refractory material. The refractory for ladle lining is characterized by being 20 to 32% (Claim 1); the refractory for ladle lining is hollow particles obtained by electromelting the hollow particles in the refractory (Claim 4). ); A refractory for ladle lining, in which the hollow particles are made of alumina (Claim 5).
更に、特許文献７には、アルミナ−スピネル質流し込み耐火物であって、粒子径０．３〜３ｍｍの中空粒子が２．５〜７．５重量％とスピネル粒子が２４〜５０重量％含まれ、かつ１０００℃における熱伝導率が２ｋｃａｌ／ｍ・ｈ・℃以下であることを特徴とする取鍋内張り用耐火物（請求項１）が開示されている。 Further, Patent Document 7 includes an alumina-spinel cast refractory containing 2.5 to 7.5% by weight of hollow particles having a particle diameter of 0.3 to 3 mm and 24 to 50% by weight of spinel particles. And the heat conductivity in 1000 degreeC is 2 kcal / m * h * degrees C or less, The refractory for ladle lining characterized by the above (Claim 1) is disclosed.
また、特許文献８には、粒度０．５〜６．０ｍｍの高耐火性セラミックスの中空粒１５〜７０ｗｔ％、粒度１ｍｍ以下の耐火原料１０〜３５ｗｔ％、η、δ、χ、γ−アルミナ中間体１０〜４０ｗｔ％、マイクロシリカ０．５〜５．０ｗｔ％、空気連行剤０．０１〜０．４ｗｔ％、及び増粘剤０．０１〜０．５ｗｔ％からなることを特徴とする耐火断熱キャスタブル耐火物（請求項１）が開示されている。なお、特許文献８の実施例においては、高耐火性セラミックスの中空粒として中空アルミナが使用されている。 In Patent Document 8, hollow particles of high refractory ceramics having a particle size of 0.5 to 6.0 mm, 15 to 70 wt%, refractory raw materials of 10 to 35 wt% having a particle size of 1 mm or less, η, δ, χ, γ-alumina intermediate Refractory heat insulation comprising 10 to 40 wt% of body, 0.5 to 5.0 wt% of microsilica, 0.01 to 0.4 wt% of air entraining agent, and 0.01 to 0.5 wt% of thickener A castable refractory (Claim 1) is disclosed. In the example of Patent Document 8, hollow alumina is used as the hollow particles of high refractory ceramics.
更に、特許文献９には、粒径が０．５〜６．０ｍｍのアルミナ中空粒１５〜７０重量％と、粒径が１ｍｍ以下のマグネシア、スピネルを主成分とする少なくともいずれか１種の第１の微粒の耐火原料の２〜３０重量％と、粒径が１ｍｍ以下のアルミナ、ムライト、シリカ、ジルコニアの少なくとも１種を主成分とする第２の微粒の耐火原料８〜６０重量％と、水硬性アルミナ、アルミナ成分６５重量％以上のアルミナセメントの少なくともいずれか１種５〜４５重量％と、空気連行剤０．０１〜０．４重量％と、増粘剤０．０１〜０．５重量％との混合物から成ることを特徴とする不定形耐火物が開示されている。 Furthermore, Patent Document 9 discloses that 15 to 70% by weight of alumina hollow particles having a particle size of 0.5 to 6.0 mm, and at least one of the main components of magnesia and spinel having a particle size of 1 mm or less. 2 to 30% by weight of one fine refractory raw material, and 8 to 60% by weight of a second fine refractory raw material mainly composed of at least one of alumina, mullite, silica and zirconia having a particle size of 1 mm or less, Hydraulic alumina, 5-45% by weight of at least one kind of alumina cement having an alumina component of 65% by weight or more, 0.01-0.4% by weight of air entraining agent, and 0.01-0.5 thickener An amorphous refractory characterized in that it consists of a mixture with% by weight is disclosed.
しかしながら、特許文献１ないし４に開示されているアルミナ・マグネシア質流し込み材は、高い耐食性を有しているものの、耐スラグ浸透性が未だ十分とは言えない。これは、実際の取鍋において、スラグ浸透に伴う変質層の生成と剥離（構造スポーリング）が損傷の主要因となっていることからもわかる。これらの流し込み材を使用して取鍋の寿命を更に延長させることは限界となっている。 However, although the alumina magnesia cast material disclosed in Patent Documents 1 to 4 has high corrosion resistance, it cannot be said that slag penetration resistance is still sufficient. This can also be seen from the fact that in an actual ladle, the generation and delamination (structural spalling) of the altered layer accompanying slag infiltration is the main cause of damage. There is a limit to further extending the life of the ladle using these castings.
また、中空アルミナを使用した耐火物について、特許文献５は、焼結抑制を指向したラミング材に関するものであり、また、特許文献８は、工業炉の断熱ライニング材に関するものであり、溶融金属に触れる内張り材を想定するものではない。更に、特許文献６及び７は、取鍋内張り用耐火物に関するものであるが、熱損失の低減を目的としており、耐食性及び耐スラグ浸透性は劣るものであった。特に、マグネシアを添加した耐火物は、使用中にアルミナと反応してスピネルを生成し、この際に膨張に起因する亀裂が発生して耐用性が劣るという問題があり、これに対する対策は何ら講じられていない。また、特許文献９は、アルミナ中空体の配合量が１５〜７０質量％（特に、実施例においては３０〜６０質量％）と多いために、空隙が多くなりすぎて耐食性が低下するために不定形耐火物としては不適である。 In addition, regarding refractories using hollow alumina, Patent Document 5 relates to a ramming material directed to sintering suppression, and Patent Document 8 relates to a heat insulating lining material of an industrial furnace, and is used as a molten metal. It is not intended for lining materials to touch. Furthermore, Patent Documents 6 and 7 relate to refractories for ladle linings, but they are aimed at reducing heat loss, and the corrosion resistance and slag penetration resistance were inferior. In particular, refractories added with magnesia react with alumina during use to produce spinel, and there is a problem that cracks due to expansion occur and the durability is inferior. It is not done. Patent Document 9 is not suitable because the amount of the hollow alumina body is as large as 15 to 70% by mass (especially 30 to 60% by mass in the examples), so that the voids increase and the corrosion resistance decreases. It is not suitable as a regular refractory.
従って、本発明の目的は、耐スラグ浸透性を従来のアルミナ・マグネシア質流し込み材よりも格段に向上させたアルミナ・マグネシア質内張り流し込み材を提供することにある。 Accordingly, an object of the present invention is to provide an alumina / magnesia-lined casting material having a slag permeation resistance significantly improved as compared with the conventional alumina / magnesia casting material.
本発明者らは、高耐スラグ浸透性を得るために、アルミナ・マグネシア質内張り流し込み材の低熱伝導率化に着目し、中空アルミナ粒子の活用について鋭意研究を重ねた結果、本発明を完成するに至った。
すなわち、本発明の内張り流し込み材は、粒子径が０．３ｍｍ以下であるマグネシアを２〜２０質量％、粒子径が５ｍｍ以下である中空アルミナ粒子を２〜１５質量％、残部がアルミナを主体とする原料からなる配合物１００質量％に、外掛けで非晶質のシリカ超微粉を０．２〜１．５質量％配合してなり、非晶質のシリカ超微粉の配合によって加熱使用時の中空アルミナ粒子の潰れを防止していることを特徴とする。
In order to obtain high slag permeation resistance, the present inventors focused on lowering the thermal conductivity of the alumina / magnesia lining casting material, and as a result of earnest research on the use of hollow alumina particles, the present invention was completed. It came to.
That is, the lining material of the present invention is mainly composed of 2 to 20% by mass of magnesia having a particle size of 0.3 mm or less, 2 to 15% by mass of hollow alumina particles having a particle size of 5 mm or less, and the balance being mainly alumina. 100% by mass of a raw material to be blended with 0.2 to 1.5 % by mass of amorphous silica ultrafine powder as an outer shell, and when heated by using the amorphous silica ultrafine powder The hollow alumina particles are prevented from being crushed .
また、本発明の内張り流し込み材は、アルミナを主体とする原料が、バインダーとしてのアルミナセメントを２〜１５質量％含むことを特徴とする。 The lining material of the present invention is characterized in that the raw material mainly composed of alumina contains 2 to 15% by mass of alumina cement as a binder.
更に、本発明の内張り流し込み材は、アルミナを主体とする原料が、粒子径０．０４５ｍｍ以下の仮焼アルミナを２〜１８質量％含むことを特徴とする。 Furthermore, the lining material of the present invention is characterized in that the raw material mainly composed of alumina contains 2 to 18% by mass of calcined alumina having a particle diameter of 0.045 mm or less.
また、本発明の内張り流し込み材は、アルミニウム粉末、アルミニウム合金粉末、発泡剤、金属ファイバー、有機ファイバー、セラミックファイバー及び分散剤からなる群から選択される１種または２種以上の成分を含むことを特徴とする。 Further, the lining material of the present invention contains one or more components selected from the group consisting of aluminum powder, aluminum alloy powder, foaming agent, metal fiber, organic fiber, ceramic fiber and dispersant. Features.
更に、本発明の内張り流し込み材は、溶鋼取鍋用内張り流し込み材であることを特徴とする。 Furthermore, the lining casting material of the present invention is a lining casting material for a molten steel ladle.
本発明によれば、中空アルミナ粒子を活用して低熱伝導率化することにより、加熱時に施工体内部に発生する温度勾配を急勾配化させることによってスラグ浸透を大幅に抑制でき、近年の過酷な炉操業条件においても十分に対応できるアルミナ・マグネシア質内張り流し込み材を提供することができる。
また、例えば、溶鋼取鍋の内張りにおいて、スラグ浸透に起因する剥離（構造スポーリング）を大幅に低減でき、耐用性が大幅に向上し、背部への地金進入も皆無となり、トータルライフを延命化できる。
更に、内張り流し込み材の軽量化、低熱伝導率化によって、施工量低減による経済的メリットや熱ロス低減によるエネルギーコストの節減も可能となる。
According to the present invention, by utilizing the hollow alumina particles to reduce the thermal conductivity, slag infiltration can be greatly suppressed by making the temperature gradient generated inside the construction body steep during heating, It is possible to provide an alumina / magnesia lining casting material that can sufficiently cope with furnace operating conditions.
In addition, for example, in the lining of a molten steel ladle, peeling (structural spalling) due to slag infiltration can be greatly reduced, the durability is greatly improved, and there is no bullion entry to the back, prolonging the total life. Can be
Furthermore, by reducing the weight of the lining casting material and lowering the thermal conductivity, it is possible to save the economic cost by reducing the construction amount and the energy cost by reducing the heat loss.
本発明の内張り流し込み材（以下、単に「流し込み材」と記載する）は、中空アルミナ粒子を活用して高耐食性を有するアルミナ・マグネシア質流し込み材の熱伝導率を低減させ、使用中の流し込み材の稼動面から背面にかけての温度勾配を大きくすることによって、耐スラグ浸透性を大幅に向上させたところに特徴がある。
例えば、取鍋は溶鋼に触れる稼動面側に流し込み材がライニング（内張り）され、その背面にパーマ煉瓦が二層または三層ライニングされ、さらにその背面が鉄皮で構成されている。稼動面に内張りされる流し込み材の施工厚みは約１００ｍｍ〜２５０ｍｍが一般的であり、稼働中の取鍋では流し込み材の表面温度は溶鋼温度と同じ１６５０℃程度となり、流し込み材の背面は８００〜１０００℃程度になる。流し込み材は稼動面から背面にかけて温度勾配が発生することになり、稼動面から流し込み材に浸透したスラグは背面側の低温度領域（スラグの融点以下）に進むと液相から固相へ変わるため、それ以上浸透できなくなる。熱伝導率の低い流し込み材を内張りに使用すると、稼動面から背面にかけての温度勾配が急勾配になる、すなわち、流し込み材の中央部や背面温度が低下するため、浸透したスラグは稼動面付近でしか液相状態を保てなくなる。その結果、スラグ浸透が抑制される。逆に、流し込み材の背面側を断熱煉瓦や断熱シートで断熱し、温度勾配を緩やかにした場合、スラグ浸透が助長され耐用性が低下することが実際の取鍋で確認されている。
The lining casting material of the present invention (hereinafter, simply referred to as “casting material”) uses hollow alumina particles to reduce the thermal conductivity of the alumina / magnesia casting material having high corrosion resistance, and is used in use. It is characterized in that the slag penetration resistance is greatly improved by increasing the temperature gradient from the operating surface to the back surface.
For example, the ladle is lined (lined) with a casting material on the side of the working surface that touches molten steel, two or three layers of permanent bricks are lined on the back, and the back is made of iron skin. The working thickness of the casting material lined on the working surface is generally about 100 mm to 250 mm. In the ladle during operation, the surface temperature of the casting material is about 1650 ° C., which is the same as the molten steel temperature, and the back surface of the casting material is 800 to It becomes about 1000 ° C. The casting material will have a temperature gradient from the working surface to the back surface, and the slag that has penetrated the casting material from the working surface will change from the liquid phase to the solid phase as it goes to the low temperature region on the back side (below the melting point of the slag). , You can not penetrate any more. If a casting material with low thermal conductivity is used for the lining, the temperature gradient from the working surface to the back surface becomes steep, that is, the central part of the casting material or the back surface temperature decreases, so that the slag that has penetrated is near the working surface. However, the liquid phase state cannot be maintained. As a result, slag penetration is suppressed. On the contrary, when the back side of the casting material is insulated with a heat insulating brick or a heat insulating sheet and the temperature gradient is moderated, it has been confirmed in an actual ladle that slag penetration is promoted and durability is lowered.
本発明の流し込み材において、マグネシアは使用中にアルミナと反応してＭｇＯ・Ａｌ２Ｏ３系スピネルを生成することで、流し込み材の耐食性と耐スラグ浸透性を向上させる作用を有する。特に、本発明の流し込み材では、マグネシアは中空アルミナ粒子と反応して中空アルミナ粒子表面をスピネル化することによって、中空アルミナ粒子の耐食性を向上させる作用も有する。そのため、本発明の流し込み材では耐食性を低下させることなく中空アルミナ粒子を使用することができる。 In the casting material of the present invention, magnesia reacts with alumina during use to produce a MgO.Al 2 O 3 spinel, thereby improving the corrosion resistance and slag penetration of the casting material. In particular, in the casting material of the present invention, magnesia reacts with the hollow alumina particles to spinel the surface of the hollow alumina particles, thereby also improving the corrosion resistance of the hollow alumina particles. Therefore, the hollow alumina particles can be used in the casting material of the present invention without reducing the corrosion resistance.
また、マグネシアとしては、その粒子径が０．３ｍｍ以下の微粉や超微粉を使用することが好ましく、また、粒子径が７５μｍ以下のものを２５質量％以上含むものが更に好ましい。マグネシアの粒子径が０．３ｍｍより粗い場合には、マグネシアと中空アルミナおよび他のアルミナ原料との反応により生成するスピネルの生成速度が遅くなり、反応による耐食性向上効果が得難くなるために好ましくない。また、粒子径が７５μｍ以下のものが２５質量％未満であると、同様に耐食性向上効果を得難くなる場合がある。なお、マグネシアは、マグネシア含有量が９０質量％以上の高純度のものを使用することが好ましい。ここで、マグネシア含有量が９０質量％未満のマグネシアでは、シリカ、ライムあるいは鉄酸化物等の不純物が多く含まれるため、耐食性の低下や残存膨張率の低下により十分な耐用性が得られなくなることがあるために好ましくない。マグネシアとしては、例えば、マグネシア含有量が９０質量％以上の天然に産するマグネサイトやその焼成物、海水より得られる海水マグネシアあるいは電融することにより得られる電融マグネシアの１種または２種以上の混合物を使用することができる。なお、マグネシアの配合量は２〜２０質量％、好ましくは５〜１０質量％の範囲内である。マグネシアの配合量が２質量％未満の場合には、マグネシアとアルミナとの反応により生成するスピネルの生成量が少なく耐食性が低下するために好ましくない。また、マグネシアの配合量が２０質量％を超えると、マグネシアとアルミナとの反応により生成したスピネルと、未反応のマグネシアが共存した状態となり、特に、溶鋼取鍋のような溶鋼と接する容器の内張り材として使用する場合には、処理スラグの浸透が抑制されず、いわゆる構造的スポーリングが発生し、耐用性が低下するために好ましくない。 Moreover, as magnesia, it is preferable to use fine powder or ultrafine powder having a particle size of 0.3 mm or less, and more preferably 25% by mass or more of particles having a particle size of 75 μm or less. When the particle size of magnesia is coarser than 0.3 mm, it is not preferable because the rate of formation of spinel generated by the reaction of magnesia with hollow alumina and other alumina raw materials becomes slow, and it becomes difficult to obtain the effect of improving corrosion resistance by the reaction. . If the particle size is less than 25% by mass, the corrosion resistance improving effect may be difficult to obtain. In addition, it is preferable to use a high-purity magnesia having a magnesia content of 90% by mass or more. Here, magnesia with a magnesia content of less than 90% by mass contains a large amount of impurities such as silica, lime or iron oxide, so that sufficient durability cannot be obtained due to a decrease in corrosion resistance or a decrease in residual expansion coefficient. It is not preferable because there is. Examples of magnesia include naturally occurring magnesite having a magnesia content of 90% by mass or more, a fired product thereof, seawater magnesia obtained from seawater, or one or more kinds of electrofused magnesia obtained by electromelting. Can be used. In addition, the compounding quantity of magnesia is 2-20 mass%, Preferably it exists in the range of 5-10 mass%. When the blending amount of magnesia is less than 2% by mass, the amount of spinel produced by the reaction between magnesia and alumina is small, which is not preferable because the corrosion resistance is lowered. Further, when the blending amount of magnesia exceeds 20% by mass, the spinel generated by the reaction of magnesia and alumina and the unreacted magnesia coexist. When used as a material, the penetration of the treated slag is not suppressed, so-called structural spalling occurs, and the durability is lowered, which is not preferable.
本発明の流し込み材において、中空アルミナ粒子は、流し込み材を軽量化すると共に熱伝導率を低減させる作用を有する。中空アルミナ粒子としては、電融法によって得られた市販品を使用できるが、その粒子径は５ｍｍ以下であり、好ましくは０．１〜５ｍｍの範囲内である。粒子径が５ｍｍを超えると、中空アルミナ粒子内部の気孔が大きくなり、流し込み材の耐食性が低下するために好ましくない。また、中空アルミナ粒子のアルミナ含有量は９５重量％以上が好ましく、更に好ましくは９８重量％以上である。アルミナ含有量が９５重量％未満では、流し込み材の耐食性が低下するために好ましくない。ここで、中空アルミナ粒子の配合量は２〜１５質量％、好ましくは５〜１０質量％の範囲内である。中空アルミナ粒子の配合量が２質量％未満の場合には、熱伝導率の低減効果が十分ではなく、また、１５質量％を超えると、流し込み材中の空隙が多くなりすぎて耐食性が低下するために好ましくない。 In the casting material of the present invention, the hollow alumina particles have the effect of reducing the thermal conductivity while reducing the weight of the casting material. As the hollow alumina particles, commercially available products obtained by the electrofusion method can be used, but the particle diameter is 5 mm or less, and preferably in the range of 0.1 to 5 mm. When the particle diameter exceeds 5 mm, the pores inside the hollow alumina particles become large and the corrosion resistance of the casting material is lowered, which is not preferable. The alumina content of the hollow alumina particles is preferably 95% by weight or more, more preferably 98% by weight or more. If the alumina content is less than 95% by weight, the corrosion resistance of the casting material is lowered, which is not preferable. Here, the amount of the hollow alumina particles is 2 to 15 % by mass, preferably 5 to 10% by mass. When the amount of the hollow alumina particles is less than 2% by mass, the effect of reducing the thermal conductivity is not sufficient, and when it exceeds 15 % by mass, the voids in the casting material increase so much that the corrosion resistance decreases. Therefore, it is not preferable.
本発明の流し込み材において、上述のマグネシア及び中空アルミナ粒子以外の残部はアルミナを主体とする原料から構成される。アルミナを主体とする原料はアルミナと、バインダーとして作用するアルミナセメントに大別される。
アルミナは耐食性と容積安定性とを兼ね備えた材質であり、本発明の流し込み材において主骨材としての役割を有する。アルミナとしては、焼結品、電融品などのいずれをも使用することができ、アルミナの含有量が９０質量％以上のものが好ましい。なお、ＴｉＯ２を１〜８質量％程度含有するものを使用することもできる。また、ボーキサイト、ばん土けつ岩、シリマナイト、ムライトなどの低純度品を使用することもできる。また、耐スポーリング性や耐食性を向上させるために、粒子径８ｍｍ以上の粗大粒を添加することもでき、また、微粉部には、高純度品を使用することが好ましい。特に、粒子径が０．０４５ｍｍ以下の超微粉としてアルミナ含有量が９８質量％以上の仮焼アルミナを使用すれば、マグネシアと反応して微細なスピネルを生成するため、耐食性及び耐スラグ浸透性を向上することができる。なお、仮焼アルミナの配合量は２〜１８質量％、好ましくは３〜１５質量％の範囲内である。
In the casting material of the present invention, the remainder other than the magnesia and hollow alumina particles described above is composed of a raw material mainly composed of alumina. Raw materials mainly composed of alumina are roughly classified into alumina and alumina cement acting as a binder.
Alumina is a material having both corrosion resistance and volume stability, and has a role as a main aggregate in the casting material of the present invention. As the alumina, any of sintered products and electrofused products can be used, and those having an alumina content of 90% by mass or more are preferable. It is also possible to use those containing TiO 2 of about 1-8% by weight. In addition, low-purity products such as bauxite, porphyry, sillimanite, and mullite can be used. In order to improve spalling resistance and corrosion resistance, coarse particles having a particle diameter of 8 mm or more can be added, and it is preferable to use a high-purity product for the fine powder part. In particular, if calcined alumina with an alumina content of 98% by mass or more is used as an ultrafine powder having a particle size of 0.045 mm or less, it reacts with magnesia to produce fine spinel, so that it has corrosion resistance and slag penetration resistance. Can be improved. In addition, the compounding quantity of calcination alumina is 2-18 mass%, Preferably it exists in the range of 3-15 mass%.
また、アルミナセメントとしては、カルシア含有量が３０質量％未満であって、カルシウムアルミネートとコランダムを主体鉱物とする高純度のハイアルミナセメントを使用することができる。なお、アルミナセメントの配合量は２〜１５質量％、好ましくは５〜８質量％の範囲内である。ここで、カルシア含有量が３０質量％以上のアルミナセメントを使用した場合やアルミナセメントの配合量が１５質量％を超える場合には、耐食性が極端に低下するために好ましくない。また、アルミナセメントの配合量が２質量％未満の場合には、施工体の強度が十分に得られないため、乾燥時の爆裂や使用中の施工体組織のギャップにより剥離損傷を起こすことがあるために好ましくない。 Further, as the alumina cement, a high-purity high-alumina cement having a calcia content of less than 30% by mass and mainly composed of calcium aluminate and corundum can be used. In addition, the compounding quantity of an alumina cement is 2-15 mass%, Preferably it exists in the range of 5-8 mass%. Here, when an alumina cement having a calcia content of 30% by mass or more is used, or when the blending amount of the alumina cement exceeds 15% by mass, the corrosion resistance is extremely lowered, which is not preferable. In addition, when the blending amount of alumina cement is less than 2% by mass, the strength of the construction body cannot be sufficiently obtained, and peeling damage may occur due to explosion during drying or a gap in construction body structure during use. Therefore, it is not preferable.
本発明の流し込み材においては、上述のマグネシア、中空アルミナ粒子及びアルミナを主体とする原料よりなる配合物１００質量％に対して、外掛けで０．２〜１．５質量％、好ましくは０．５〜１．２質量％の非晶質のシリカ超微粉を配合する。非晶質のシリカ超微粉を使用する目的は、使用時の流し込み材中に（Ｃａ−Ａｌ−Ｓｉ）酸化物系や（Ｎａ−Ｍｇ−Ｓｉ）酸化物系の液相を生成させ、施工体の応力緩和性を高めることにある。すなわち、流し込み材中に適量の液相が存在すると材料が軟化し、外部からの応力や自身の熱膨張を吸収することができる。本発明の流し込み材では、上記配合物へ非晶質のシリカ超微粉を配合することによる応力緩和によって中空アルミナ粒子が潰れることを防止することができる。 In the casting material of the present invention, the outer covering is 0.2 to 1.5 % by mass, preferably 0.8%, based on 100% by mass of the composition mainly composed of magnesia, hollow alumina particles and alumina. 5 to 1.2% by mass of amorphous silica ultrafine powder is blended. The purpose of using amorphous silica ultrafine powder is to create a (Ca-Al-Si) oxide-based or (Na-Mg-Si) oxide-based liquid phase in the casting material during use. The purpose of this is to increase the stress relaxation property. That is, when an appropriate amount of liquid phase is present in the casting material, the material softens and can absorb external stress and its own thermal expansion. In the casting material of the present invention, it is possible to prevent the hollow alumina particles from being crushed by stress relaxation caused by blending amorphous ultrafine silica powder into the blend.
ここで、アルミナとマグネシアが反応してスピネルを生成する際に体積が約８％膨張することが知られており、鉄皮で拘束されている取鍋等の内張りへアルミナ・マグネシア質流し込み材を適用した場合、この体積膨張によって施工体に亀裂が生ずることがある。特に、本発明の流し込み材では、中空アルミナ粒子を使用するため、この体積膨張によって中空アルミナ粒子が潰れて、熱伝導率を低下させる効果が得られなくなる恐れがある。そのため、非晶質のシリカ超微粉を使用することは本発明の流し込み材にとって必須である。非晶質のシリカ超微粉の配合量が上記配合物１００質量％に対して、外掛けで０．１質量％未満の場合には、上述した液相生成量が少なく材料が軟化し難くなるため、中空アルミナ粒子が潰れ易くなり、熱伝導率を低下することができず、その結果、耐スラグ浸透性が低下するために好ましくない。一方、非晶質のシリカ超微粉の配合量が２質量％を超えると、液相生成量が多くなりすぎるため、耐食性が極端に低下し、また、過焼結により亀裂が発生し易くなるために好ましくない。 Here, it is known that when alumina and magnesia react to produce spinel, the volume expands by about 8%. Alumina / magnesia casting material is applied to the lining of a ladle or the like constrained by iron skin. When applied, this volume expansion may cause cracks in the construction body. In particular, since the casting material of the present invention uses hollow alumina particles, the volume expansion causes the hollow alumina particles to be crushed, and the effect of reducing the thermal conductivity may not be obtained. Therefore, it is essential for the casting material of the present invention to use amorphous silica ultrafine powder. When the blending amount of the amorphous silica ultrafine powder is less than 0.1% by mass with respect to 100% by mass of the above compound, the amount of liquid phase produced is small and the material is difficult to soften. The hollow alumina particles are liable to be crushed and the thermal conductivity cannot be lowered. As a result, the slag penetration resistance is lowered, which is not preferable. On the other hand, if the blending amount of amorphous silica ultrafine powder exceeds 2% by mass, the amount of liquid phase generated becomes too large, so that the corrosion resistance is extremely lowered and cracking is likely to occur due to oversintering. It is not preferable.
なお、本発明の流し込み材には、必要に応じて、アルミニウム粉末、アルミニウム合金粉末、発泡剤、金属ファイバー、有機ファイバー、セラミックファイバー、縮合燐酸塩やポリアクリル酸ナトリウム、ポリカルボン酸カルシウム等のアルカリ金属あるいはアルカリ土類金属塩やそれらの重合体または共重合体などの分散剤を本発明の効果を阻害しない範囲で配合することができる。 The casting material of the present invention includes an alkali powder such as aluminum powder, aluminum alloy powder, foaming agent, metal fiber, organic fiber, ceramic fiber, condensed phosphate, sodium polyacrylate, and calcium polycarboxylate as necessary. A dispersing agent such as a metal or alkaline earth metal salt or a polymer or copolymer thereof can be blended within a range that does not impair the effects of the present invention.
本発明の流し込み材の流し込み施工は、特に限定されるものではなく、慣用・公知の手段を用いて行うことができ、例えば、流し込み材をミキサーに投入し、水を４〜１０質量％程度添加・混練した後、混合物をダイレクトあるいは搬送ホッパー、あるいはピストンポンプやスクイズポンプ等の圧送機器を使用し、施工枠内に投入し、バイブレーター等の加振機器を使用して行うことができる。 The casting construction of the casting material of the present invention is not particularly limited, and can be performed using conventional / known means. For example, the casting material is put into a mixer, and about 4 to 10% by mass of water is added. -After kneading, the mixture can be put into a construction frame using a direct or conveying hopper, or a pumping device such as a piston pump or a squeeze pump, and can be carried out using a vibrating device such as a vibrator.
以下に実施例を挙げて本発明の流し込み材を更に説明する。
以下の表１に記載の原料配合割合にて本発明品及び比較品の流し込み材を作製した。なお、本発明品８は参考例である。
Hereinafter, the casting material of the present invention will be further described with reference to examples.
The casting material of the present invention product and the comparative product were produced at the raw material blending ratio shown in Table 1 below. The product 8 of the present invention is a reference example.
上記表１において、
焼結アルミナ（５〜１ｍｍ）のアルミナ含有量は９９．４質量％であった。
焼結アルミナ（１ｍｍ以下）のアルミナ含有量は９９．４質量％であった。
電融アルミナ（５〜１ｍｍ）のアルミナ含有量は９９．５質量％であった。
電融アルミナ（１ｍｍ以下）のアルミナ含有量は９９．３質量％であった。
仮焼アルミナのアルミナ含有量は９９．７質量％であった；
焼結マグネシア（０．３ｍｍ以下）のマグネシア含有量は９５．２質量％であり、粒子径７５μｍ以下の粒子の含有量は６５質量％であった；
アルミナセメントのカルシア含有量は１７．０質量％であり、主体鉱物はカルシウム・アルミネート（ＣＡ）およびコランダムより構成されるものであった；
中空アルミナ粒子のアルミナ含有量は９９．０質量％であった。
In Table 1 above,
The alumina content of sintered alumina (5 to 1 mm) was 99.4% by mass.
The alumina content of sintered alumina (1 mm or less) was 99.4% by mass.
The alumina content of electrofused alumina (5 to 1 mm) was 99.5% by mass.
The alumina content of electrofused alumina (1 mm or less) was 99.3% by mass.
The alumina content of the calcined alumina was 99.7% by mass;
The magnesia content of sintered magnesia (0.3 mm or less) was 95.2% by mass, and the content of particles having a particle diameter of 75 μm or less was 65% by mass;
The calcia content of the alumina cement was 17.0% by weight and the main mineral was composed of calcium aluminate (CA) and corundum;
The alumina content of the hollow alumina particles was 99.0% by mass.
次に、本発明品１〜８並びに比較品１〜６の流し込み材に、表１に記載する量の水を加え、万能ミキサーで混練した後、型枠に流し込み、硬化、脱枠後、１１０℃で２４時間乾燥することにより下記の曲げ強さ、熱伝導率、侵食試験用の供試体を作製した。得られた結果を表１に併記する。
・曲げ強さ
ＪＩＳ Ｒ２５５３に準じ、１１０℃乾燥後及び１０００℃焼成後の各供試体について測定した；
・熱伝導率
１１５×１１４×６５ｍｍの供試体を１０００℃で３時間焼成した後、熱線法により測定した；
・侵食試験
転炉スラグを侵食剤とし、１６５０℃で４時間の回転侵食試験を実施し、「侵食深さ（ｍｍ）」、「浸透深さ（ｍｍ）」を測定した。また、侵食試験後の供試体の亀裂の発生状況を観察した。
Next, after adding the amount of water described in Table 1 to the casting materials of the present invention products 1-8 and comparative products 1-6, kneading with a universal mixer, casting into a mold, curing, removing the frame, 110 The following specimens for bending strength, thermal conductivity, and erosion test were prepared by drying at 24 ° C. for 24 hours. The obtained results are also shown in Table 1.
-Flexural strength According to JIS R2553, it measured about each specimen after 110 degreeC drying and 1000 degreeC baking;
Thermal conductivity: 115 × 114 × 65 mm specimens were fired at 1000 ° C. for 3 hours and then measured by the hot wire method;
-Erosion test Using the converter slag as an erosion agent, a rotary erosion test was conducted at 1650 ° C for 4 hours, and "erosion depth (mm)" and "penetration depth (mm)" were measured. In addition, the occurrence of cracks in the specimen after the erosion test was observed.
表１から明らかなように、本発明品１〜８は、熱伝導率が低下すると共に耐食性及び耐スラグ浸透性に優れた流し込み材である。これに対して、比較品１〜６は、耐食性や耐スラグ浸透性に劣り、比較品６を除いて侵食試験後に亀裂の発生が確認された。 As is apparent from Table 1, the products 1 to 8 of the present invention are pouring materials having a low thermal conductivity and an excellent corrosion resistance and slag penetration resistance. On the other hand, Comparative products 1 to 6 were inferior in corrosion resistance and slag penetration resistance, and cracks were confirmed after the erosion test except for Comparative product 6.
本発明の内張り流し込み材は、溶鋼取鍋の内張りに好適に使用することができる。 The lining casting material of the present invention can be suitably used for the lining of a molten steel ladle.
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