JP2005179131A - Dry spraying monolithic refractory for repairing tundish blended with spent refractory - Google Patents
Dry spraying monolithic refractory for repairing tundish blended with spent refractory Download PDFInfo
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- 238000005507 spraying Methods 0.000 title claims abstract description 18
- 239000011823 monolithic refractory Substances 0.000 title abstract 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 34
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 22
- 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 claims abstract description 17
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 239000011819 refractory material Substances 0.000 claims description 18
- 230000008439 repair process Effects 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 12
- 239000000203 mixture Substances 0.000 abstract description 10
- 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 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 12
- 238000010276 construction Methods 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 6
- 239000011449 brick Substances 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000011362 coarse particle Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000004901 spalling Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052849 andalusite Inorganic materials 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 235000012216 bentonite Nutrition 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- -1 chamotte Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000010443 kyanite Substances 0.000 description 1
- 229910052850 kyanite Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- VXYADVIJALMOEQ-UHFFFAOYSA-K tris(lactato)aluminium Chemical compound CC(O)C(=O)O[Al](OC(=O)C(C)O)OC(=O)C(C)O VXYADVIJALMOEQ-UHFFFAOYSA-K 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Abstract
Description
本発明は使用済耐火物を配合したタンデッシュ補修用乾式吹付け不定形耐火物に関するものである。 The present invention relates to a dry-type sprayed amorphous refractory for repairing a tundish containing a used refractory.
従来、溶融金属の内張りに使用された後の耐火物は、その殆どが廃棄処分されている。そこで、資源の有効利用の観点からこの使用済耐火物の再利用が試みられている。 Conventionally, most of the refractories after being used for the lining of the molten metal are disposed of. Then, the reuse of this used refractory is tried from the viewpoint of effective use of resources.
使用済耐火物の一般的な利用方法は、これを粉砕して、定形耐火物あるいは不定形耐火物の耐火原料の一部として配合するものである。例えば溶鋼精錬容器の内張りとして使用した後のマグネシア−クロム質耐火れんがの粉砕品を耐火れんがに配合することが提案されている（例えば特許文献1を参照）。
不定形耐火物への利用例は、マグネシア質れんがあるいはドロマイト質れんがの使用済品を配合した焼付け補修材（例えば特許文献2を参照）、マグネシア−カーボンれんがの廃材を使用したマグネシア質キャスタブル耐火物（例えば特許文献3を参照）、カーボン含有耐火物の廃材を使用した吹付け補修材（例えば特許文献4を参照）が提案されている。
Examples of use for non-standard refractories include baked repair materials containing used magnesia bricks or dolomite bricks (see, for example, Patent Document 2), and magnesia castable refractories using magnesia-carbon brick waste. (For example, refer patent document 3), the spray repair material (for example, refer patent document 4) using the waste material of a carbon containing refractory is proposed.
使用済耐火物の組織には複数の耐火原料が混在しており、品質が一定していない。また、焼成・電融の未使用の耐火原料に比べて緻密性に劣る。 The structure of the used refractory contains a plurality of refractory raw materials, and the quality is not constant. Moreover, it is inferior to denseness compared with the unused refractory raw material of baking and electromelting.
耐火物の耐食性、強度等はマトリックス組織によって大きく左右される。このため、品質が一定しないことに加えて緻密性に劣る使用済耐火物は、主として粗粒部に配合するのが一般的である。 The corrosion resistance, strength, etc. of the refractory depend greatly on the matrix structure. For this reason, it is general that the used refractory having inferior denseness in addition to the fact that the quality is not constant is mainly blended in the coarse portion.
マグネシアカーボン質等のカーボン含有れんがの使用済耐火物を利用したものでは、例えば前記した特許文献3、特許文献4の発明のとおり、使用済耐火物を予めリン酸、リン酸の金属塩、酸化物ゾル、金属アルコキシド等をもって含浸処理している。この含浸による表面処理によって使用済耐火物は親水性、耐消化性が向上する。 In the case of using a used refractory of carbon-containing brick such as magnesia carbonaceous material, for example, as described in the inventions of Patent Document 3 and Patent Document 4, the used refractory is previously phosphoric acid, phosphoric acid metal salt, oxidation Impregnation treatment with metal sol, metal alkoxide, etc. The surface treatment by this impregnation improves the hydrophilicity and digestion resistance of the used refractory.
しかし、以上の粗粒部に配合、さらには含浸処理によっても使用済耐火物の利用は、未使用の耐火原料による耐火物に比べて耐食性、強度等の特性に劣る。また、含浸処理はその処理工程の付加によって耐火物の製造コスト高が否めない。 However, the use of the used refractory is blended in the coarse part and further impregnated, and the properties such as corrosion resistance and strength are inferior to those of the refractory made of unused refractory material. Moreover, the impregnation treatment cannot be denied the high manufacturing cost of the refractory due to the addition of the treatment process.
連続鋳造容器等の内張り材で、流し込みによって施工されるアルミナ−シリカ質不定形耐火物がある。この材質は使用中に溶鋼の高温を受けてアルミナとシリカが反応し、ムライト（Ａｌ2Ｏ3・ＳｉＯ2）を生成し、その反応に伴う低熱膨張性によって耐火物の熱的組織安定性が向上し、耐亀裂性、耐剥離が向上する。 There is an alumina-silica amorphous refractory which is a lining material such as a continuous casting container and is constructed by pouring. This material is subjected to the high temperature of molten steel during use, and alumina and silica react to produce mullite (Al 2 O 3 · SiO 2 ), and the thermal structure stability of the refractory is reduced by the low thermal expansion associated with the reaction. Improves crack resistance and peeling resistance.
本発明者らは前記アルミナ−シリカ質使用済不定形耐火物のうち、この不定形耐火物が使用中において生成したムライトを含むものを、特に乾式吹付け用不定形耐火物の耐火原料の一部として使用したところ、耐食性を損なうことなく、吹付け施工の特性に要求される付着性および接着性に優れた効果が得られることを見出し、本発明を完成するに至ったものである。また、使用済耐火物に表面処理等を行わなくとも前記効果が得られることで、製造コスト高を招くこともない。 The present inventors, among the above-mentioned alumina-silica used amorphous refractories, contain mullite produced during use of this amorphous refractory, particularly one of the refractory raw materials for dry spraying amorphous refractories. When used as a part, the present inventors have found that an effect excellent in adhesion and adhesiveness required for spraying characteristics can be obtained without impairing corrosion resistance, and the present invention has been completed. Further, the above-described effects can be obtained without performing surface treatment or the like on the used refractory material, thereby preventing an increase in manufacturing cost.
本発明の特徴とするところは、内張りの表面に耐火性コーティング材を被覆して使用されるタンデッシュの内張り本体を補修する乾式吹付け不定形耐火物であって、耐火物使用中に生成したムライト（Ａｌ2Ｏ3・ＳｉＯ2）を含むアルミナ−シリカ質使用済不定形耐火物を粉砕し、粒度調整したもの10〜75質量％と、平均粒子径が10μｍ未満のアルミナ超微粉および／またはシリカ超微粉が3〜20質量％、残部がアルミナ質原料および／またはアルミナ−シリカ質原料を主体とした組成を耐火原料とする。 A feature of the present invention is a dry-type sprayed amorphous refractory for repairing a tundish lining body used by coating a refractory coating material on the surface of the lining, which is produced during use of the refractory. Alumina-silica used amorphous refractory containing (Al 2 O 3 · SiO 2 ), pulverized and adjusted in particle size, 10 to 75% by mass, ultrafine alumina powder and / or silica having an average particle size of less than 10 μm A composition mainly composed of 3 to 20% by mass of ultrafine powder and the remainder being an alumina material and / or an alumina-silica material is used as a refractory material.
吹付け不定形耐火物の耐火原料組成は、付着性、接着強度、耐食性等を考慮して粗粒、中粒、微粒に適宜調整されている。乾式吹付けでは不定形耐火物を材料タンクよりエアー圧送し、ノズルまたはノズル手前で加水して吹付ける。あるいは、材料タンクより、排出させた不定形耐火物を加水混錬しつつノズルに向けてエアー圧送し吹付ける。 The refractory raw material composition of the sprayed amorphous refractory is appropriately adjusted to coarse particles, medium particles, and fine particles in consideration of adhesion, adhesive strength, corrosion resistance, and the like. In dry-type spraying, refractories of irregular size are air-fed from a material tank and sprayed with water added in front of the nozzle or nozzle. Alternatively, from the material tank, the discharged amorphous refractory is air-mixed and sprayed toward the nozzle while hydroly kneading.
本発明の吹付け不定形耐火物に耐火原料として用いるアルミナ−シリカ質使用済不定形耐火物は、微粉と粗粒の集合体のために、一般のアルミナ質またはアルミナ・シリカ質の耐火原料にくらべて比重が小さい。その結果、吹付け時のリバウンドロスが少なく、付着性において優れた効果を発揮する。また、比重が小さい耐火原料の使用はホースおよびノズルの消耗を軽減できる効果もある。 The alumina-silica used amorphous refractory used as a refractory raw material for the sprayed amorphous refractory of the present invention is a general alumina or alumina / silica refractory raw material due to the aggregate of fine powder and coarse particles. Specific gravity is small compared to. As a result, there is little rebound loss at the time of spraying, and an excellent effect in adhesion is exhibited. In addition, the use of a refractory material having a small specific gravity also has an effect of reducing the consumption of the hose and the nozzle.
さらに、使用済不定形耐火物は比重が小さい分、多孔質である。本発明の吹付け不定形耐火物はこの多孔質耐火原料を含むことで施工体の熱応力を吸収緩和し、被施工面からの剥離が防止され、接着性が向上する。 Further, the used amorphous refractory is porous because of its small specific gravity. By containing this porous refractory raw material, the sprayed amorphous refractory of the present invention absorbs and relaxes the thermal stress of the construction body, prevents peeling from the construction surface, and improves the adhesion.
連続鋳造用容器としてのタンデッシュの内張り材として使用されるアルミナ−シリカ質不定形耐火物は、タンデッシュ受鋼による高温下においてその耐火原料成分であるアルミナとシリカとが反応し、ムライトを生成する。本発明の吹付け不定形耐火物は、耐火物使用中に生成したムライトを含むアルミナ−シリカ質使用済不定形耐火物を耐火原料に使用吹付け材は、使用後不定形耐火物中の存在するムライトの低熱膨張性のため耐スポーリング性に優れる。また、ムライトは高温で安定であり、耐食性にも優れる。 Alumina-silica amorphous refractory used as a tundish lining material as a continuous casting container reacts with alumina and silica, which are refractory raw material components, at high temperatures by tundish receiving steel to produce mullite. The sprayed amorphous refractory of the present invention uses alumina-silica used amorphous refractory containing mullite generated during refractory use as a refractory raw material The spray material exists in the amorphous refractory after use Excellent spalling resistance due to low thermal expansion of mullite. In addition, mullite is stable at high temperatures and has excellent corrosion resistance.
タンデッシュの内張りの表面には地金除去を容易にするためにＭｇＯ質等のコーティング材が被覆されている。多孔質の使用済耐火物を耐火原料に使用した本発明の吹付け不定形耐火物は、通常の耐火物の使用では耐食性の低下が懸念されるが、タンデッシュの内張りとしての使用はコーティング材に被覆されていることで、その耐用性は耐食性の優劣に大きく影響しない。タンデッシュの内張りは熱スポールによる損傷が著しい。ムライトを含み且つ多孔質である使用後不定形耐火原料を使用した本発明の吹付け不定形耐火物は、吸収緩和能と低熱膨張性によって、タンデッシュの内張りに要求される耐熱スポール性に優れた効果を発揮する。 The surface of the lining of the tundish is coated with a coating material such as MgO to facilitate the removal of the metal. The sprayed amorphous refractory of the present invention using porous used refractory as a refractory raw material is feared to deteriorate the corrosion resistance when using a normal refractory, but use as a tundish lining is a coating material. By being coated, the durability does not greatly affect the superiority or inferiority of the corrosion resistance. The tundish lining is severely damaged by thermal spalls. The sprayed amorphous refractory material of the present invention using a porous refractory raw material containing mullite and porous after use is excellent in heat-resistant spalling property required for tundish lining due to absorption relaxation ability and low thermal expansion. Demonstrate the effect.
本発明の乾式吹付け不定形耐火物は、アルミナ−シリカ質使用済不定形耐火物のうち、この不定形耐火物が使用中において生成したムライトを含むものを耐火原料の一部として使用したことにより、耐食性を損なうことなく、吹付け施工の特性に要求される付着性および接着性に優れた効果を得ることができる。また、使用済耐火物に表面処理等を行わなくとも前記効果が得られ、製造コスト高を招くこともない。これにより、従来廃棄処分されていた使用済み不定形耐火物の有効利用を図ることができる。 The dry sprayed amorphous refractory of the present invention uses alumina-silica spent amorphous refractory containing mullite produced during use as part of the refractory raw material. Thereby, the effect excellent in the adhesiveness and adhesiveness requested | required by the characteristic of spraying construction can be acquired, without impairing corrosion resistance. Moreover, even if it does not perform surface treatment etc. on a used refractory, the said effect is acquired and manufacturing cost high is not caused. Thereby, the effective utilization of the used amorphous refractory conventionally discarded can be aimed at.
本発明の不定形耐火物に配合するアルミナ−シリカ質使用済不定形耐火物は、主にタンデッシュの内張り材として使用されたものである。使用中の流し込み材マトリックス部にムライトを生成した材質であることが必要であり、ムライトの含有有無は例えばＸ線回折によって確認することができる。 The alumina-silica used amorphous refractory blended with the amorphous refractory according to the present invention is mainly used as a tundish lining material. It is necessary to be a material in which mullite is generated in the casting material matrix portion in use, and the presence or absence of mullite can be confirmed by, for example, X-ray diffraction.
アルミナ−シリカ質使用済不定形耐火物であっても、温度が低い場所での使用等によってマトリックス中にムライト生成がない材質では、本発明の耐熱スポール性向上の効果が得られない。 Even if the alumina-silica used amorphous refractory is used, a material that does not generate mullite in the matrix due to use in a place where the temperature is low or the like cannot obtain the effect of improving the heat resistance of the present invention.
アルミナ−シリカ質使用済不定形耐火物は、吹付け不定形耐火物の耐火原料に占める割合で、10質量％未満では付着性、耐熱スポーリング性において本発明の効果が得られず、75質量％を超えると多孔質耐火原料の割合が過多となって耐機械的損傷性の低下を招く。さらに好ましい範囲は30〜60質量％である。 Alumina-silica used amorphous refractory is the ratio of sprayed amorphous refractory to the refractory raw material, and if it is less than 10% by mass, the effect of the present invention is not obtained in adhesion and heat spalling resistance, and 75 mass If it exceeds 50%, the proportion of the porous refractory raw material becomes excessive, leading to a decrease in mechanical damage resistance. A more preferable range is 30 to 60% by mass.
アルミナ−シリカ質使用済不定形耐火物の粒度は、耐火原料組成全体に占める割合で粒径8〜1ｍｍを10〜20質量％、1ｍｍ未満を0〜55質量％が好ましい。8〜1ｍｍの粗粒が少ないと耐機械的損傷性および熱膨張吸収緩和の効果に影響し、多過ぎると付着率の低下傾向が見られる。また、粒径1ｍｍ未満が多過ぎると粒度構成全体のバランスから粗粒部のアルミナ−シリカ質使用済不定形耐火物の割合を少なくしなければならず、付着性、接着性において不十分となる。粒径1ｍｍ未満は25〜45質量％が好ましい。なお、本発明でいう粒度は、ＪＩＳふるい目開きに基づいた分級である。 The particle size of the alumina-silica used amorphous refractory is preferably 10 to 20% by mass with a particle size of 8 to 1 mm and 0 to 55% by mass with less than 1 mm as a percentage of the total refractory raw material composition. If there are few coarse particles of 8-1 mm, it will affect the mechanical damage resistance and the effect of thermal expansion absorption relaxation, and if too much, the tendency of the adhesion rate to fall will be seen. If the particle size is less than 1 mm, the proportion of coarse-grained alumina-silica used amorphous refractory must be reduced from the balance of the entire particle size structure, resulting in insufficient adhesion and adhesion. . The particle size of less than 1 mm is preferably 25 to 45% by mass. In addition, the particle size as used in the field of this invention is classification based on JIS sieve opening.
アルミナ−シリカ質不定形耐火物の使用済廃材は、化学的成分値で例えばＳｉＯ２：30〜40質量％、Ａｌ2Ｏ3：55〜65質量％のものが好ましい。 The used waste materials of the alumina-silica amorphous refractory are preferably those having a chemical component value of, for example, SiO 2 : 30 to 40% by mass and Al 2 O 3 : 55 to 65% by mass.
耐火原料組成のうち残部となるアルミナおよび／またはアルミナ・シリカ原料は耐食性および容積安定性に優れた耐火原料である。具体的割合は5〜87質量％での範囲内での使用が好ましい。 The remaining alumina and / or alumina / silica raw material in the refractory raw material composition is a refractory raw material excellent in corrosion resistance and volume stability. The specific ratio is preferably 5 to 87% by mass.
アルミナおよび／またはアルミナ・シリカ原料の粒度は微粒主体での使用が好ましいが、前記した使用済廃材の使用割合が少ない場合は不定形耐火物全体の粒度バランスを図るために必要により、粗粒部にも使用する。 The particle size of the alumina and / or alumina / silica raw material is preferably used mainly in the form of fine particles. However, if the used waste material is small in proportion, the coarse particle portion is necessary in order to balance the particle size of the entire amorphous refractory. Also used for.
アルミナの具体例は、焼結アルミナ、電融アルミナ、ボーキサイト、ばん土けつ岩である。アルミナ・シリカ耐火原料の具体例は、ムライト、シャモット、アンダルサイト、カイヤナイトである。 Specific examples of alumina are sintered alumina, electrofused alumina, bauxite, and porphyry shale. Specific examples of the alumina / silica refractory raw material are mullite, chamotte, andalusite, and kyanite.
平均粒子径が10μｍ未満のアルミナ超微粉の具体例は焼結品、電融品のいずれでもよい。アルミナ超微粉は、超微粉として入手しやすい仮焼アルミナが好ましい。仮焼アルミナは平均粒径が5μｍ未満の超微粉である。シリカ超微粉を使用する場合も同様に、平均粒子径が10μｍ未満のものを使用する。シリカ超微粉は、超微粉として入手しやすい揮発シリカの使用が特に好ましい。その使用量は耐火原料組成全体に占める割合で3〜20質量％、さらに好ましくは3〜10質量％である。3質量％未満の場合は、施工体組織強度が低下し接着性に劣り、20質量％を超えると流動性が過多となり付着性の低下を招く。なお、前記超微粉の平均粒子径はレーザー回折／散乱式粒度分布測定装置により求められる。 Specific examples of the ultrafine alumina powder having an average particle size of less than 10 μm may be either a sintered product or an electrofused product. The alumina ultrafine powder is preferably calcined alumina which is easily available as the ultrafine powder. Calcinated alumina is an ultrafine powder having an average particle size of less than 5 μm. Similarly, when using an ultrafine silica powder, one having an average particle size of less than 10 μm is used. As the silica ultrafine powder, it is particularly preferable to use volatile silica which is easily available as the ultrafine powder. The amount used is 3 to 20% by mass, more preferably 3 to 10% by mass, as a percentage of the total refractory raw material composition. If it is less than 3% by mass, the strength of the construction body structure is lowered and the adhesiveness is inferior, and if it exceeds 20% by mass, the fluidity becomes excessive and the adhesiveness is lowered. The average particle size of the ultrafine powder is determined by a laser diffraction / scattering particle size distribution measuring device.
また、耐火原料組成には本発明の効果を阻害しない範囲で上記以外の耐火原料を組合わせてもよい。例えば、ろう石、けい石、ケイ石、溶融シリカ、粘土等である。 Moreover, you may combine a refractory raw material composition with a refractory raw material other than the above in the range which does not inhibit the effect of this invention. For example, there are wax, quartzite, silica, fused silica, clay and the like.
結合剤については従来の吹付け用不定形耐火物と特に変わりない。例えば、アルミナセメント、マグネシアセメント、ポルトランドセメント等が挙げられる。その添加量は耐火原料組成100質量％に対し、結合剤の種類に応じて1〜15質量％の範囲で調整するのが好ましい。中でも、施工体の強度付与および耐火性を兼備えたアルミナセメントが好ましい。 The binder is not particularly different from conventional spraying refractories. For example, alumina cement, magnesia cement, Portland cement and the like can be mentioned. The addition amount is preferably adjusted in the range of 1 to 15% by mass depending on the kind of the binder with respect to 100% by mass of the refractory raw material composition. Among these, alumina cement having both strength imparting and fire resistance of the construction body is preferable.
さらに、有機質短繊維あるいは無機質短繊維を例えば1質量％以下の範囲で添加し、付着性、乾燥性等の効果を付与してもよい。有機質短繊維の材質例としてはナイロン、ビニロン、ＰＶＡ、ポリエステル等である。無機質短繊維の材質例としてはアルミナ、シリカ、アルミナ−シリカ、ロックウール等である。 Furthermore, organic short fibers or inorganic short fibers may be added within a range of, for example, 1% by mass or less to impart effects such as adhesion and drying properties. Examples of the organic short fiber material include nylon, vinylon, PVA, and polyester. Examples of the material of the inorganic short fiber include alumina, silica, alumina-silica, rock wool and the like.
以上の他にも、吹付け用不定形耐火物の添加物として知られている、例えばピッチ、フェノール樹脂、ホウ酸塩、シリカゾル、アルミナゾル、乳酸アルミニウム、耐火性超微粉、ＣＭＣ、アルギン酸ナトリウム、粘土、ベントナイト、炭酸カルシウム、硝酸カリウム、消石灰、金属繊維、吸水性ポリマー、金属粉、分散剤などを必要に応じて添加してもよい。 In addition to the above, it is known as an additive for spraying amorphous refractories, such as pitch, phenol resin, borate, silica sol, alumina sol, aluminum lactate, refractory ultrafine powder, CMC, sodium alginate, clay Bentonite, calcium carbonate, potassium nitrate, slaked lime, metal fiber, water-absorbing polymer, metal powder, dispersant and the like may be added as necessary.
施工は乾式吹付けで行う。すなわち、吹付け不定形耐火物を材料タンクよりエアー圧送し、ノズルまたはノズル手前で加水して吹付ける。あるいは、材料タンクより、排出させた吹付け不定形耐火物を加水混錬しつつノズルに向けてエアー圧送し吹付ける。加水量は、吹付け不定形耐火物に対する外掛けで２０〜２５質量％が好ましい。タンデッシュは、この吹付け補修後、さらにその上に耐火性コーティング材を被覆して使用される。 Construction will be done by dry spraying. In other words, the sprayed amorphous refractory is air-fed from the material tank and is sprayed with water added in front of the nozzle or the nozzle. Alternatively, the blown amorphous refractory discharged from the material tank is air-blown and sprayed toward the nozzle while being hydromixed. The amount of water added is preferably 20 to 25% by mass with respect to the sprayed amorphous refractory. After the spray repair, the tundish is further used with a fireproof coating material coated thereon.
以下に本発明の実施例およびその比較例を示す。表1は各例で使用した主な耐火原料の化学分析値、Ｘ線回折結果、見掛気孔率を示す。見掛気孔率は日本学術振興会第124委員会試験法分科会の「学振法2.マグネシアクリンカーの見掛気孔率、見掛比重及びかさ比重の測定方法」に準じて測定した。
表１に示す使用済不定形耐火物、未使用不定形耐火物は、ともにアルミナ−シリカ質原料、アルミナ微粉およびシリカ微粉を含む耐火原料組成からなる不定形耐火物である。使用済不定形耐火物は、タンデッシュの内張りとして１５０チャージ使用されたものである。 The used amorphous refractory and the unused amorphous refractory shown in Table 1 are both amorphous refractories composed of a refractory raw material composition containing an alumina-silica raw material, alumina fine powder and silica fine powder. The used amorphous refractory is one that has been used for 150 charges as a tundish lining.
未使用不定形耐火物は耐火原料中にムライトを一部含んでいる。一方、使用済不定形耐火物は、使用中にアルミナ微粉とシリカ微粉が加熱によりムライトが生成し、未使用品に比べてＸ線回折のムライトピーク強度が増大している。なお、表中において＋の数値はＸ線のピーク強度で、＋個数が多いほどピーク強度が大きい。 Unused amorphous refractories contain some mullite in the refractory raw material. On the other hand, in the used amorphous refractory, alumina fine powder and silica fine powder are heated to produce mullite during use, and the mullite peak intensity of X-ray diffraction is increased as compared with an unused product. In the table, the value of + is the peak intensity of X-rays, and the peak intensity increases as the number of + increases.
表2、表3は、各例における不定形耐火物の配合組成とその試験結果である。試験方法は以下のとおりである。
付着性：各例の吹付け不定形耐火物は、乾式吹付け装置にて吹付けた。加水量は、吹付け不定形耐火物に対する外掛けで２２質量％とした。垂直の被補修面に対して吹付け、不定形耐火物総施工量に対する吹付け後のリバウンドロスから、付着率を求めた。 Adhesiveness: The sprayed amorphous refractories in each example were sprayed with a dry spraying device. The amount of water added was 22% by mass with respect to the sprayed amorphous refractory. The adhesion rate was calculated from the rebound loss after spraying on the vertical repair surface and after spraying on the total amount of the irregular refractory.
接着性：吹付け後、曲げ強さを測定し、吹付け材と被補修材との境界部の接着強度を評価した。 Adhesiveness: After spraying, the bending strength was measured, and the adhesive strength at the boundary between the sprayed material and the repaired material was evaluated.
耐スポール性: 吹付け後、60×60×230ｍｍのサイズに切り出した試験片を、110℃×24時間乾燥した後、加熱（1500℃）20分→水冷10分→空冷10分を10サイクル繰り返す片面加熱-冷却を実施した。試験片の亀裂、剥離の状況を3段階で評価した（○…剥離無し亀裂軽微、△…剥離無し、亀裂有り、×…剥離発生）。 Spall resistance: After spraying, test pieces cut to a size of 60 x 60 x 230 mm are dried at 110 ° C for 24 hours, and then heated (1500 ° C) for 20 minutes → water-cooled for 10 minutes → air-cooled for 10 minutes. Single-sided heating-cooling was performed. The test piece was evaluated for cracking and peeling in three stages (◯: slight cracking without peeling, Δ: no peeling, with cracking, x: occurrence of peeling).
耐食性：吹付け後、その施工体から試験片を切り出し、鋼と転炉スラグよりなる侵食剤を用いて1600℃での回転侵食試験を行い、溶損速度を求めた。 Corrosion resistance: After spraying, a test piece was cut out from the construction body and subjected to a rotary erosion test at 1600 ° C using an erodant composed of steel and converter slag to determine the rate of erosion.
実機耐用性：60ｔタンデッシュの内張り補修として吹付け施工後の施工体が消滅するまでのチャージ数を求めた。 Actual machine durability: As the lining repair of 60t tundish, the number of charges until the construction body after spray construction disappeared was determined.
本発明実施例は、付着性、接着性および耐スポール性に優れた効果が得られた。その結果、これらの効果は実機評価においても良好な耐用性を示した。 In the examples of the present invention, an effect excellent in adhesion, adhesion and spall resistance was obtained. As a result, these effects showed good durability even in actual machine evaluation.
これに対し、使用済不定形耐火物を使用しない比較例１は、耐食性には優れるものの付着性および耐スポール性に劣る。比較例２は、未使用不定形耐火物を使用したものであり、比較例1と同様に付着性、耐スポール性に劣る。比較例３は、使用済不定形耐火物の使用量が多く、付着性、接着性に劣る。超微粉の使用量が少ない比較例４は、付着性、接着性、耐スポール性に劣る。 On the other hand, the comparative example 1 which does not use a used amorphous refractory is inferior in adhesion and spall resistance, although it is excellent in corrosion resistance. Comparative Example 2 uses an unused amorphous refractory, and is inferior in adhesion and spall resistance like Comparative Example 1. In Comparative Example 3, the amount of used amorphous refractory used is large, and the adhesion and adhesion are poor. Comparative Example 4 with a small amount of ultrafine powder is inferior in adhesion, adhesion, and spall resistance.
本発明の乾式吹付け不定形耐火物は、内張り本体の表面に耐火性コーティング材を被覆して使用されるタンデッシュに対し、その内張り補修に使用する。 The dry sprayed irregular refractory material of the present invention is used for repairing the lining of a tundish used by coating the surface of the lining body with a refractory coating material.
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| CN110467472A (en) * | 2019-08-27 | 2019-11-19 | 北京利尔高温材料股份有限公司 | A kind of continuous casting production permanent layer castable |
| CN114890800A (en) * | 2022-05-12 | 2022-08-12 | 贵州华鑫新材料有限公司 | Preparation method of novel mullite-combined light castable |
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| US9744979B2 (en) | 2014-04-11 | 2017-08-29 | Electro-Motive Diesel, Inc. | Train communication network |
| CN110467472A (en) * | 2019-08-27 | 2019-11-19 | 北京利尔高温材料股份有限公司 | A kind of continuous casting production permanent layer castable |
| CN114890800A (en) * | 2022-05-12 | 2022-08-12 | 贵州华鑫新材料有限公司 | Preparation method of novel mullite-combined light castable |
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