JPH0233467B2 - KINZOKUYOYUHOONZAITOSONOSEIZOHOHO - Google Patents
KINZOKUYOYUHOONZAITOSONOSEIZOHOHOInfo
- Publication number
- JPH0233467B2 JPH0233467B2 JP14901888A JP14901888A JPH0233467B2 JP H0233467 B2 JPH0233467 B2 JP H0233467B2 JP 14901888 A JP14901888 A JP 14901888A JP 14901888 A JP14901888 A JP 14901888A JP H0233467 B2 JPH0233467 B2 JP H0233467B2
- Authority
- JP
- Japan
- Prior art keywords
- silica
- molten metal
- heat insulating
- insulating material
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 33
- 239000011810 insulating material Substances 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 24
- 239000000377 silicon dioxide Substances 0.000 claims description 17
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 15
- 239000011707 mineral Substances 0.000 claims description 15
- 239000010459 dolomite Substances 0.000 claims description 14
- 229910000514 dolomite Inorganic materials 0.000 claims description 14
- 239000008187 granular material Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 239000002893 slag Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000010304 firing Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 241000209094 Oryza Species 0.000 description 4
- 235000007164 Oryza sativa Nutrition 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 235000009566 rice Nutrition 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 235000013379 molasses Nutrition 0.000 description 3
- 239000012768 molten material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000007605 air drying Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 239000010903 husk Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- -1 shale Chemical compound 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、容器に収容された金属溶湯の表面に
浮べてこれを保温するための保温材に関し、その
製造方法をも包含する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat insulating material for floating on the surface of molten metal contained in a container to keep it warm, and also includes a method for manufacturing the same.
たとえば鋼の連続鋳造に当つて、タンデイツシ
ユ中に保持された溶鋼は、そこから注ぎ出す初期
と終期とで温度差が大きくなつてはならないにも
かかわらず、湯面は広く、放熱量は大になるか
ら、極力保温につとめなければならない。
For example, during continuous casting of steel, the temperature difference between the initial and final stages of pouring out the molten steel held in the tundish must not be large, but the surface of the molten steel is wide and the amount of heat dissipated is large. Therefore, we must do our best to keep warm.
この目的で従来使用されていたのは、主に焼い
たモミガラである。焼きモミガラは安価である
が、微細で軽い（カサ比重は約0.1）ため、湯面
上に投入するとき、高温がひきおこす上昇気流に
乗つて飛散しやすいという難点がある。その成分
は下記の分析例にみるとおりであつて、Ｃ
SiO2 Al2O3 FeO
48.1 41.3 1.5 1.0
溶鋼に対して加炭のおそれがあることや、
SiO2＋Ｃ→SiO＋CO
の反応によりケイ素量を高める危険があり、
Al2O3の存在も好ましいものではないから、焼き
モミガラ保温材は、とくに成分組成を厳密にコン
トロールすべき特殊鋼の溶湯に対しては適切とい
えない。 Traditionally, roasted rice hulls have been used for this purpose. Roasted rice husks are inexpensive, but because they are fine and light (their bulk specific gravity is about 0.1), they have the disadvantage that when they are poured over the hot water, they tend to get blown away by the rising air currents caused by the high temperatures. Its components are as shown in the analysis example below. C SiO 2 Al 2 O 3 FeO 48.1 41.3 1.5 1.0 There is a risk of carburization of molten steel, and the amount of silicon is reduced due to the reaction of SiO 2 +C→SiO+CO. There is a risk of increasing
Since the presence of Al 2 O 3 is also undesirable, roasted rice husk heat insulators are not suitable for molten special steel, in particular, whose composition must be strictly controlled.
このような心配のない溶湯保温材として、ドロ
マイト粉末を造粒して焼成した、CaO・MgO多
孔質球の使用が試みられた。この保温材は、投入
当初は有用であるが、溶湯表面のスラグと反応し
て溶融するため、保温効果が持続しない。溶湯を
注ぎ出した後は、このスラグと保温材との反応生
成物がタンデイツシユの内張り耐火物に固着し
て、除去が困難である。 As a molten metal heat insulating material that does not have such concerns, attempts have been made to use CaO/MgO porous spheres made by granulating and firing dolomite powder. This heat insulating material is useful when it is first introduced, but it reacts with the slag on the surface of the molten metal and melts, so the heat insulating effect does not last. After the molten metal is poured out, the reaction product between the slag and the heat insulating material sticks to the refractory lining of the tundish, making it difficult to remove.
保温材の塩基度を低めたものとすれば、上記の
残存スラグが破砕しやすく、タンデイツシユから
除去しやすいものとなるはずであるとの考えにも
とづいて、CaO・MgOに対して10〜30重量％の
SiO2を添加して造粒、焼成を試みた。しかし、
粒の崩壊が多くて製品歩留りが低く、不成功に終
つた。 Based on the idea that if the basicity of the heat insulating material is lowered, the residual slag mentioned above should be easier to crush and be removed from the tundish. %of
Granulation and firing were attempted by adding SiO 2 . but,
The product was unsuccessful due to a lot of grain collapse and low product yield.
この理由として、CaO−MgO−SiO2の系では
当然に2CaO・SiO2が生成し、よく知らているよ
うにこの化合物は850℃付近の変態に伴う体積変
化が大であつて、上記した粒の崩壊をひきおこす
ことが考えられる。 The reason for this is that in the CaO-MgO-SiO 2 system, 2CaO SiO 2 is naturally produced, and as is well known, this compound undergoes a large volume change due to transformation at around 850°C, and the above-mentioned grains It is conceivable that this could cause the collapse of the
本発明の目的は、連続鋳造のためにタンデイツ
シユに保持されている溶鋼を代表とする金属溶湯
が、表面からの放熱により冷えることを軽減する
目的で使用する保温材において、保温効果が高く
て比較的よく持続し、かつ溶湯上のスラグと反応
して生成した溶融物が容易に破砕除去できるよう
な保温材と、その製造方法を提供することにあ
る。
The purpose of the present invention is to provide a heat insulating material that has a high heat retaining effect and is used to reduce the cooling of molten metal, typically molten steel, held in a tundish for continuous casting due to heat radiation from the surface. It is an object of the present invention to provide a heat insulating material that lasts well and allows easy crushing and removal of the molten material produced by reacting with slag on the molten metal, and a method for producing the same.
本発明の金属溶湯保温材は、第３図に示すよう
に、ドロマイト粉末の焼結体からなるほぼ球状の
殻５の内部に、空間７を残して、シリカを主成分
とする鉱物の粉末の焼結体６が包み込まれたもの
３である。
As shown in FIG. 3, the molten metal heat insulating material of the present invention leaves a space 7 inside a nearly spherical shell 5 made of a sintered body of dolomite powder, and is made of mineral powder mainly composed of silica. This is the one 3 in which the sintered body 6 is wrapped.
この保温材の成分は、殻５を構成する焼結ドロ
マイトが70〜95重量％、その内部に包み込まれた
球状のシリカを主成分とする鉱物の粉末の焼結体
６が残りの30〜５重量％を占めるのが適当であ
る。 The components of this heat insulating material are 70 to 95% by weight of sintered dolomite that constitutes the shell 5, and the remaining 30 to 95% by weight is a sintered body 6 of mineral powder mainly composed of spherical silica wrapped inside the shell. % by weight is appropriate.
大きさは広い範囲にえらぶことができるが、外
径５〜20mm、ふつうは10mm内外が、製造および使
用に好都合である。 The size can be chosen from a wide range, but outer diameters of 5 to 20 mm, usually around 10 mm, are convenient for manufacture and use.
このような溶湯保温材を与える本発明の製造方
法は、下記の諸工程からなる。 The manufacturing method of the present invention for producing such a molten metal heat insulating material consists of the following steps.
イ） シリカを主成分とする鉱物の粉末に対し、
加熱により焼失する物質を混合して第１図のよ
うに造粒すること、
ロ） 得られた粒状体１を芯にして、その外側に
ドロマイトの粉末を付着させて造粒し、第２図
に示すような粒状体１と外皮４からなる二重球
状体２とすること、および
ハ） 二重球状体２を加熱し、ドロマイトの粉末
を焼結させて殻５にするとともに、シリカを主
成分とする鉱物の粉末と混合されていた物質を
焼失させてこの鉱物をもとの粒状体より小さい
球状体６に焼結させることにより、上記殻の内
側に空間７を形成すること。b) For mineral powder whose main component is silica,
Mixing substances that are burnt out by heating and granulating them as shown in Figure 1; b) Using the obtained granules 1 as a core, attaching dolomite powder to the outside and granulating them, as shown in Figure 2. c) The double spherical body 2 is heated to sinter the dolomite powder to form the shell 5, and silica is the main component. A space 7 is formed inside the shell by burning out the substance mixed with the component mineral powder and sintering the mineral into spherical bodies 6 smaller than the original granular body.
「シリカを主成分とする鉱物」とは、SiO2が
70重量％以上を占め、Al2O3、CaO、MgO、
Fe2O3、さらにはNaやＫの化合物が残りを占め
るようなものをいう。代表例は、ケイ石をはじ
め、蛇紋岩、頁岩、ベントナイトなどである。 "Mineral whose main component is silica" means that SiO2 is
Accounting for more than 70% by weight, Al 2 O 3 , CaO, MgO,
Fe 2 O 3 , as well as Na and K compounds occupying the remainder. Typical examples include silica, serpentine, shale, and bentonite.
最初の工程イ）においてシリカを主成分とする
鉱物の粉末と混合する物質は、後の焼成工程で焼
失して空間を形成するための材料であるから、そ
の目的に適したものをえらぶ。代表的には、微粉
炭や木粉のような炭素含有物質が使いやすく、製
紙スラツジのようなものも使用できる。混合割合
は、容積にして40：60〜60：40が適当である。造
粒手段は任意であり、たとえばパンペレタイザー
が有用である。造粒には、多くの場合、バインダ
ーが必要であろう。バインダーもまた、後に焼失
するものであることが好ましく、糖蜜液のような
ものが適当である。この工程でつくる粒状体のサ
イズは、直径５〜15mm、とくに７〜８mmが代表的
である。 The material to be mixed with the mineral powder mainly composed of silica in the first step (a) is the material that will be burnt away to form the space in the subsequent firing step, so a material suitable for that purpose is selected. Typically, carbon-containing materials such as pulverized charcoal and wood flour are easy to use, and materials such as paper sludge can also be used. A suitable mixing ratio is 40:60 to 60:40 by volume. Any granulating means may be used; for example, a pan pelletizer is useful. Granulation will often require a binder. The binder is also preferably one that is later burnt off, and something like molasses is suitable. The typical size of the granules produced in this step is 5 to 15 mm in diameter, particularly 7 to 8 mm.
続く工程ロ）も既知の技術に従つて実施できる
が、工程イ）と同様の手法で行うのが得策であろ
う。二重球状体２において、芯にした混合粉の粒
状体１の大きさとドロマイト粉末の外皮４の厚さ
とが、製品保温材中３のCaO・MgO対SiO2の比
を決定することはもちろんである。CaO・MgO
の100重量部を与えるCaCO3・MgCO3は185重量
部であるから、前記した成分組成の保温材をつく
るためには、（ドロマイトの純度やCaCO3／
MgCO3比によつて異なることはもちろんである
が）、粒状体中のSiO2100重量部に対し外皮とし
てCaCO3・MgCO3粉末430〜3520重量部を付着さ
せることになる。 The following step b) can also be carried out according to known techniques, but it would be advisable to carry it out in a manner similar to step a). In the double spherical body 2, the size of the core mixed powder granules 1 and the thickness of the dolomite powder outer skin 4 determine the ratio of CaO/MgO to SiO 2 in the product heat insulating material 3. be. CaO・MgO
The amount of CaCO 3 /MgCO 3 that provides 100 parts by weight of
Of course, this will vary depending on the MgCO 3 ratio), but 430 to 3520 parts by weight of CaCO 3 .MgCO 3 powder is attached as the outer skin to 100 parts by weight of SiO 2 in the granules.
二重球状体は焼成に先立つて乾燥させる必要が
あるが、風乾で十分である。 The double spheres need to be dried prior to firing, but air drying is sufficient.
最後の焼成工程は、ロータリーキルンそのほ
か、任意の手段で実施する。シリカを主成分とす
る鉱物の粉末と混合した物質が、炭素含有物質の
ように燃焼により消失するものであるときは、加
熱炉の雰囲気を酸化性にすべきことはいうまでも
ない。温度は、殻となるCaO・MgO焼結体が適
度の強度をもつとともに、それ自体の多孔度も比
較的高く保たれるように、また内部の混合物中の
可燃物質が十分に焼失するように、1100℃〜1300
℃の範囲にえらび、30分間〜数時間加熱する。 The final firing step is carried out using a rotary kiln or other arbitrary means. It goes without saying that if the substance mixed with mineral powder containing silica as a main component is one that disappears by combustion, such as a carbon-containing substance, the atmosphere in the heating furnace should be oxidizing. The temperature is set so that the CaO/MgO sintered body that forms the shell has appropriate strength and maintains its own relatively high porosity, and so that the flammable substances in the internal mixture are sufficiently burnt out. , 1100℃~1300
Choose a range of ℃ and heat for 30 minutes to several hours.
本発明の溶湯保温材を溶鋼上に投入すると、中
空である上に殻自体も多孔質で軽いから、溶鋼上
の溶融スラグ層にわずか接触した状態で浮き、よ
く保温の役目を果す。スラグとの接触による反応
とその結果である溶融も、中空体であるため単な
る焼結塊よりは進行が遅く、保温効果に持続性が
ある。
When the molten metal heat insulating material of the present invention is placed on top of molten steel, it is hollow and the shell itself is porous and light, so it floats in slight contact with the molten slag layer on top of the molten steel, effectively serving as a heat insulator. Because it is a hollow body, the reaction caused by contact with the slag and the resulting melting proceed more slowly than in a simple sintered mass, and the heat retention effect is sustainable.
この溶湯保温材が溶融したのちは、内部に包み
込まれていた球状体も溶融物中に加わり、CaO−
MgO−SiC2にスラグ成分が加わつた系を形成す
る。この系が冷却固化したものは、CaO−MgO
系とスラグとの反応生成物よりも、破砕除去が容
易である。これには、前記した2CaO・SiO2の生
成とその冷却過程での体積変化がひきおこす、部
分的崩壊が寄与しているのではないかと思われ
る。 After this molten metal heat insulating material melts, the spherical bodies wrapped inside also join the molten material, causing CaO−
A system is formed in which a slag component is added to MgO-SiC 2 . What this system cools and solidifies is CaO−MgO
It is easier to crush and remove than the reaction product between the system and the slag. This is thought to be due to the formation of 2CaO.SiO 2 mentioned above and the partial collapse caused by the volume change during its cooling process.
本発明の溶湯保温材の製造方法においては、焼
成工程において、シリカを主成分とする鉱物の粉
末と混合した物質の焼失により適度の空間をもつ
た中空体が得られることは、すでに述べたとおり
である。炭素含有物質の酸化による焼失を期待す
る場合は、殻を形成するドロマイト粉の外皮を比
較的粗粒の粉末で形成しておくことにより、また
1300℃のような高温の採用により、外部からの
O2の供給と、生成したCO、CO2、H2Oあるいは
揮発成分のガスなどの、殻を通しての通過が可能
になる。高温の焼成は、材料にイオウ分が含まれ
ている場合にも、それを揮散させるのに役立つ。 As already mentioned, in the method for manufacturing a molten metal heat insulating material of the present invention, a hollow body with an appropriate amount of space is obtained by burning out the substance mixed with mineral powder whose main component is silica in the firing process. It is. If it is expected that carbon-containing substances will be burnt out due to oxidation, it is possible to
By adopting high temperature such as 1300℃, it is possible to prevent external
This allows the supply of O 2 and the passage of generated CO, CO 2 , H 2 O or volatile gases through the shell. High temperature firing also helps to volatilize any sulfur contained in the material.
このようにして、ＣやＳなどの有害成分を実質
上含有しない、それ自体多孔質で、しかも中空形
状の溶湯保温材が得られる。 In this way, a molten metal heat insulating material which is porous and hollow in itself and which does not substantially contain harmful components such as C and S can be obtained.
ケイ石粉末（44μを90％通過）50重量％、微粉
炭（88μを50％通過）50重量％の混合物を、糖蜜
液をバインダーとして、パンペレタイザーにかけ
て造粒した。粒状体の直径は、6.7〜7.9mmの範囲
であつた。
A mixture of 50% by weight of silica powder (90% passing through 44μ) and 50% by weight pulverized coal (50% passing through 88μ) was granulated using a pan pelletizer using molasses liquid as a binder. The diameter of the granules ranged from 6.7 to 7.9 mm.
次に、この粒状体を芯にして、ドロマイト粉末
（44μを50％通過、297μを全部通過）を、やはり
糖蜜液をバインダーとしてパンペレタイザーで造
粒した。得られた二重球状体の直径は、11.1〜
12.7mmのものが98％を占めていた。 Next, using this granular material as a core, dolomite powder (50% passed through 44μ, all passed through 297μ) was granulated using a pan pelletizer, also using molasses liquid as a binder. The diameter of the obtained double sphere is 11.1~
12.7mm accounted for 98%.
これを風乾したのち、電気炉に入れて1300℃に
１時間加熱した。 After air-drying this, it was placed in an electric furnace and heated to 1300°C for 1 hour.
得られた保温材は、上記範囲のサイズのものが
96％を占め、木屋式硬度として3.5〜7.2Kg、平均
6.3Kgの値を示し、十分な強度をもつていた。見
掛け比重は0.59で、前述のドロマイト−ケイ石混
合系の保温材試作品の比重が0.72であつたことか
らみて、明らかに軽量化されている。 The obtained insulation material has a size within the above range.
Accounting for 96%, Kiya type hardness is 3.5-7.2Kg, average
It showed a value of 6.3Kg and had sufficient strength. The apparent specific gravity is 0.59, which is clearly lighter than the specific gravity of the aforementioned dolomite-silica stone mixed heat insulation material prototype, which was 0.72.
化学分析の結果は、つぎのとおりである。 The results of chemical analysis are as follows.
CaO MgO SiO2 R2O3
59.1％ 27.2 12.2 0.44
Ｓ Ｃ CO2 Ig・loss
0.034 検出なし 0.23 0.50
この保温材を用いて溶湯を保温したときの効果
を、つぎの実験により確認した。 CaO MgO SiO 2 R 2 O 3 59.1% 27.2 12.2 0.44 S C CO 2 Ig・loss 0.034 Not detected 0.23 0.50 The effect of keeping molten metal warm using this heat insulating material was confirmed through the following experiment.
比較的多量の炭素を含有する鉄約4.6Kgを、高
周波誘導炉（内経115mm）内で溶解した。下記の
各場合について、湯面下約10mmの位置に熱電対を
浸漬して、炉への電力供給を断つた時点から、温
度を測定した。 Approximately 4.6 kg of iron containing a relatively large amount of carbon was melted in a high-frequency induction furnace (internal diameter 115 mm). In each of the following cases, a thermocouple was immersed at a position approximately 10 mm below the hot water surface, and the temperature was measured from the time the power supply to the furnace was cut off.
（本発明）
CaO・MgO／SiO2＝90／10（重量）の中空保温
材（直径約4.76〜5.66mm）を、厚さ約20mm（重量
105ｇ）となるように使用
比較例 １
焼モミガラを、厚さ20mm（48ｇ）使用
比較例 ２
CaO・MgO・SiO2の混合物（CaO・MgO／
SiO2＝90／10）を造粒し焼結させて得た塊を、
厚さ20mm（150ｇ）使用
比較例 ３
保温材なし
上記の各場合の温度変化を、第４図のグラフに
示す。(This invention) CaO・MgO/SiO 2 = 90/10 (weight) hollow insulation material (diameter approx. 4.76 to 5.66 mm) with a thickness of approx. 20 mm (weight
1 Comparative example of using roasted rice hulls with a thickness of 20 mm (48 g) 2 A mixture of CaO, MgO, and SiO 2 (CaO, MgO/
A lump obtained by granulating and sintering SiO 2 =90/10) is
Comparative example using 20mm (150g) thickness 3 No heat insulating material The temperature changes in each of the above cases are shown in the graph in Figure 4.
本発明によるとき、最も保温効果が高く、保温
材の使用量が少ない（比較例２の150ｇに対して
実施例は105ｇ）から、生成スラグ量がそれに応
じて少なくできることがわかる。 In the case of the present invention, the heat insulation effect is the highest and the amount of heat insulation used is small (105 g in Example compared to 150 g in Comparative Example 2), so it can be seen that the amount of generated slag can be reduced accordingly.
本発明の溶湯保温材は、金属溶湯の表面に浮べ
て保温に用いたとき、飛散する心配がないのはも
ちろんのこと、金属に対して好ましくない成分変
動をひきおこすことがない。保温効果は高く、か
つ比較的長時間にわたつて持続する。
When the molten metal heat insulating material of the present invention is used for heat insulation by floating on the surface of molten metal, there is no need to worry about it scattering, and it also does not cause undesirable component fluctuations in the metal. The heat retention effect is high and lasts for a relatively long time.
従つて、この保温材は、鋼の連続鋳造における
タンデイツシユ内溶鋼の保温に使用したとき、そ
の意義が最も大きい。溶鋼上のスラグと保温材の
反応によつて生成する溶融物も、固化したのち破
砕除去が容易であつて、除去作業に当つてタンデ
イツシユ内張り耐火材を損傷することがない。 Therefore, this heat insulating material has the greatest significance when used to insulate molten steel in a tundish during continuous steel casting. The molten material produced by the reaction between the slag on the molten steel and the heat insulating material is also easy to crush and remove after solidifying, and the removal work does not damage the refractory lining of the tundish.
この溶湯保温材の製造は、安価な原料とありふ
れた装置を使用して実施でき、エネルギー消費も
少ないから、コストは低廉である。 The production of this molten metal insulation material can be carried out using inexpensive raw materials and common equipment, and the cost is low because it consumes little energy.
第１図および第２図は、本発明の溶湯保温材の
製造工程を説明するためのものであつて、第１図
は、シリカを主成分とする鉱物の粉末に加熱によ
り焼失する物質の粉末を混合して造粒した、芯と
なる粒状体を、第２図はその外側に外皮となるド
ロマイト粉末を付着させて造粒した二重球状体
を、それぞれ示す断面図である。第３図は、第２
図の二重球状体を焼成して得た、本発明の溶湯保
温材の断面図である。第４図は、本発明の溶湯保
温材の保温効果を在来のものと比較して示したグ
ラフである。
１…混合物の粒状体、２…二重球状体、３…溶
湯保温材、４…ドロマイト粉末外皮、５…焼結ド
ロマイト殻、６…シリカを主成分とする鉱物の焼
結体、７…空間。
Figures 1 and 2 are for explaining the manufacturing process of the molten metal heat insulating material of the present invention. Fig. 2 is a cross-sectional view showing a granular body which is a core made by mixing and granulating the granules, and a double spherical body which is granulated by adhering dolomite powder to the outer side of the core granular body. Figure 3 shows the second
FIG. 2 is a cross-sectional view of the molten metal heat insulating material of the present invention obtained by firing the double spherical body shown in the figure. FIG. 4 is a graph showing the heat retaining effect of the molten metal heat insulating material of the present invention in comparison with that of a conventional material. 1... Mixture granules, 2... Double spherical bodies, 3... Molten metal heat insulating material, 4... Dolomite powder shell, 5... Sintered dolomite shell, 6... Mineral sintered body containing silica as a main component, 7... Space .
Claims (1)
の殻の内部に、空間を残して、シリカを主成分と
する鉱物の粉末の焼結体が包み込まれた構造の金
属溶湯保温材。 ２ ドロマイトの粉末の焼結体70〜95重量％と、
シリカを主成分とする鉱物の焼結体30〜５重量％
とからなる請求項１の金属溶湯保温材。 ３ 下記の諸工程からなる金属溶湯保温材の製造
方法 イ） シリカを主成分とする鉱物の粉末に対し、
加熱により焼失する物質を混合して造粒するこ
と、 ロ） 得られた粒状体を芯にして、その外側にド
ロマイトの粉末を付着させて造粒し、二重球状
体とすること、および ハ） この二重球状体を加熱し、ドロマイトの粉
末を焼結して殻にするとともに、シリカを主成
分とする鉱物の粉末と混合されていた物質を焼
失させてこの鉱物をもとの粒状体より小さい球
状体に焼結させることにより、上記殻の内側に
空間を形成すること。[Scope of Claims] 1. A molten metal having a structure in which a sintered body of mineral powder mainly composed of silica is wrapped inside a nearly spherical shell made of a sintered body of dolomite powder, leaving a space inside. Heat insulation material. 2 70 to 95% by weight of a sintered body of dolomite powder,
30-5% by weight of mineral sintered body mainly composed of silica
The molten metal heat insulating material according to claim 1, comprising: 3. Method for manufacturing molten metal heat insulating material consisting of the following steps a) For mineral powder whose main component is silica,
2) Mixing and granulating substances that are burnt out by heating, 2) Using the obtained granules as a core and attaching dolomite powder to the outside of the granules to form a double spherical body, and ) This double spherical body is heated to sinter the dolomite powder into a shell, and the substance mixed with the silica-based mineral powder is burned out to return this mineral to the original granular form. Creating a space inside the shell by sintering it into smaller spheres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14901888A JPH0233467B2 (en) | 1988-06-16 | 1988-06-16 | KINZOKUYOYUHOONZAITOSONOSEIZOHOHO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14901888A JPH0233467B2 (en) | 1988-06-16 | 1988-06-16 | KINZOKUYOYUHOONZAITOSONOSEIZOHOHO |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01317667A JPH01317667A (en) | 1989-12-22 |
| JPH0233467B2 true JPH0233467B2 (en) | 1990-07-27 |
Family
ID=15465872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14901888A Expired - Lifetime JPH0233467B2 (en) | 1988-06-16 | 1988-06-16 | KINZOKUYOYUHOONZAITOSONOSEIZOHOHO |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0233467B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4855554B2 (en) * | 2009-12-10 | 2012-01-18 | 新日本製鐵株式会社 | Molten steel surface thermal insulation and molten steel surface thermal insulation method |
| BR112012013501B1 (en) * | 2009-12-10 | 2019-06-25 | Nippon Steel & Sumitomo Metal Corporation | AGENT FOR MAINTENANCE OF THE SURFACE TEMPERATURE OF THE CAST STEEL AND METHOD FOR MAINTENANCE OF THE SURFACE TEMPERATURE OF THE CAST STEEL |
-
1988
- 1988-06-16 JP JP14901888A patent/JPH0233467B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01317667A (en) | 1989-12-22 |
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