JPH032307A - Heat retaining agent for molten metal - Google Patents
Heat retaining agent for molten metalInfo
- Publication number
- JPH032307A JPH032307A JP13637289A JP13637289A JPH032307A JP H032307 A JPH032307 A JP H032307A JP 13637289 A JP13637289 A JP 13637289A JP 13637289 A JP13637289 A JP 13637289A JP H032307 A JPH032307 A JP H032307A
- Authority
- JP
- Japan
- Prior art keywords
- heat retaining
- molten metal
- retaining agent
- chaff
- weight
- 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.)
- Pending
Links
- 239000002184 metal Substances 0.000 title claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 7
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 5
- 239000000571 coke Substances 0.000 claims abstract description 5
- 239000010455 vermiculite Substances 0.000 claims abstract description 5
- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 5
- 235000019354 vermiculite Nutrition 0.000 claims abstract description 5
- 241000209094 Oryza Species 0.000 claims description 25
- 235000007164 Oryza sativa Nutrition 0.000 claims description 25
- 239000010903 husk Substances 0.000 claims description 25
- 235000009566 rice Nutrition 0.000 claims description 25
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 4
- 239000003830 anthracite Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 239000000428 dust Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract 1
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 229910001562 pearlite Inorganic materials 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- 238000004380 ashing Methods 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000010306 acid treatment Methods 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005183 environmental health Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
こめ発明は、溶融金属用保温剤、特に取鍋などの容器に
収容された溶鉄又は溶鋼の表面に被覆して保温せしめる
保温剤に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a heat insulating agent for molten metal, particularly a heat insulating agent that coats the surface of molten iron or molten steel contained in a container such as a ladle to keep it warm. be.
従来この種の保温剤としては籾殻、焼籾殻などが使用さ
れているが、これらの保温剤は優れた保温性能を有して
いるものの、嵩が大きいため一度に大量の輸送が困難な
こと、又保管場所にも大きなスペースを要する等の取扱
上の問題がある。更には使用後は灰化し粉塵になり易い
と云った環境衛生上の問題や又、昨今の減反政策が実施
されるに至り、且つ、次第に新規の用途にも使用される
ようになってきたことから入手し難い状況になりつつあ
り、種々の問題を抱えている。Conventionally, rice husks, burnt rice husks, etc. have been used as this type of heat insulating agent, but although these heat insulating agents have excellent heat retaining performance, they are bulky and difficult to transport in large quantities at one time. Furthermore, there are handling problems such as the need for a large storage space. Furthermore, there are environmental health problems such as the fact that it tends to ash and turn into dust after use, and recent acreage reduction policies have been implemented, and it is gradually being used for new purposes. It is becoming increasingly difficult to obtain, and there are various problems.
特公昭５２−１６０４４には製紙工場からの焼滓を乾燥
して得られる粉末バルブを前記籾殻等の代わりに用いる
ことが開示されているが、該粉末パルプにおいては、比
重が０．５〜０．６であり、焼籾殻に比べると２〜４倍
程であるため当然保温性が劣るので、使用量が増加する
こと、又、製紙工場から二次発生的に得られるものであ
り、供給量にも限界があること又、入手地域も限定され
ること等の間通がある。Japanese Patent Publication No. 52-16044 discloses the use of powder pulp obtained by drying slag from a paper mill in place of the rice husk, etc., but the powder pulp has a specific gravity of 0.5 to 0. .6, which is about 2 to 4 times that of burnt rice husks, so it naturally has inferior heat retention, so the amount used will increase, and since it is obtained secondary from paper mills, the supply amount will be limited. However, there are limitations such as the fact that there are limits to the availability of these products, and that the areas in which they can be obtained are also limited.
本発明はこのような問題点を解消すべく開発されたもの
であり従来の籾殻或いは焼籾殻等の使用二を減少せしめ
て安定的に原料を供給する体制を維持し、作業時の取扱
いを容易ならしめなお且つ従来と同様な保温性を保持し
得る溶融金属用保温剤を提供することを目的とするもの
である。The present invention was developed to solve these problems, and reduces the use of conventional rice husks or burnt rice husks, maintains a stable supply of raw materials, and facilitates handling during work. It is an object of the present invention to provide a heat insulating agent for molten metal that can be easily seasoned and maintain the same heat retaining properties as conventional ones.
本発明者らの研究、実験によれば、かかる目的は、籾殻
、焼籾殻、コークス、無煙炭等の炭素系骨材の一種又は
、複数種を組合せたもの１００重量部に対し、酸処理黒
鉛、蛭石、真珠岩等の加熱膨張性物質１〜３０重量部と
を配合して成ることを特徴とする溶融金属用保温剤によ
って達成されることが見出されたのである。According to the research and experiments conducted by the present inventors, this purpose was achieved by adding acid-treated graphite, acid-treated graphite, It has been found that this can be achieved by a heat insulating agent for molten metal characterized by containing 1 to 30 parts by weight of a thermally expandable substance such as vermiculite or nacre.
従来使用されている籾殻、焼き籾殻類はその嵩比重が０
．１〜０．３と極めて軽く、保温性能は他に類を見ない
ほど高い。それ故に溶湯の保温を目的に多用されている
のであるが、溶湯上面に撒布されると、直ちに燃焼をは
じめ、炭化から灰化へと進行しながらボリュームは次第
に減少して、最終的には１／２〜１／４のボリュームま
で減少するが、炭化状態（焼き籾殻の状態）から灰化状
態への進行は遅く、その間１呆温性は持続されるのであ
る。The bulk specific gravity of conventionally used rice husks and roasted rice husks is 0.
．． It is extremely light at a weight of 1 to 0.3, and its heat retention performance is unparalleled. Therefore, it is often used for the purpose of keeping the molten metal warm, but when it is sprinkled on the top of the molten metal, it immediately starts to burn, progressing from carbonization to ashing, and the volume gradually decreases until it reaches 1. The volume decreases to 1/2 to 1/4, but the progress from the carbonized state (burned rice husk state) to the incinerated state is slow, and during that time, the temperature is maintained.
本発明者らはこの点に着目し、炭化から灰化への進行が
遅いのは、焼き籾殻が軽量でポーラスであるが故に熱伝
導が悪く、炭素質が焼失しにくい条件下にあることを察
知し、膨張剤を添加することで積極的に嵩比重を低下さ
せ、より一層熱伝導を低下せしめることで炭素質の焼失
を更に遅らせることを見出して本発明に至ったのである
。The present inventors focused on this point and found that the slow progress from carbonization to ashing is due to the fact that burnt rice husks are lightweight and porous, so heat conduction is poor, and the carbonaceous material is difficult to burn away. They realized this and discovered that by adding an expanding agent, the bulk specific gravity can be actively lowered to further reduce heat conduction, thereby further delaying the burnout of the carbonaceous material, leading to the present invention.
以下、本発明について詳述する。The present invention will be explained in detail below.
骨材としては籾殻、焼き籾殻の外にコークス、無煙炭等
の各種炭素質骨材を用いることができる。As the aggregate, in addition to rice husk and burnt rice husk, various carbonaceous aggregates such as coke and anthracite can be used.
本発明ではかかる炭素質骨材１００重量部に対して１〜
３０重量部の加熱膨張性物質を添加するのであるが、加
熱膨張性物質は酸処理膨張黒鉛、蛭石、真珠岩と云った
加熱して膨張するものであれば良い。In the present invention, 1 to 100 parts by weight of such carbonaceous aggregate
30 parts by weight of a heat-expandable substance is added, and the heat-expandable substance may be any material that expands when heated, such as acid-treated expanded graphite, vermiculite, and nacre.
加熱膨張性物質の添加量を１〜３０重量部とした理由は
、１重量部未満であれば膨張効果が少なすぎて従来の籾
殻又は焼き籾殻等の単体を使用する場合と保温効果が変
わらないこと、又、３０重量部を超えると膨張が大きす
ぎて湯面上に均等に撒布しなければ凹凸が多く？＆覆が
不均一になりやすいと云ったことや、撒布する際の飛散
が多くなる等の問題が生ずるためである。The reason why the amount of heat-expandable material added is 1 to 30 parts by weight is that if it is less than 1 part by weight, the expansion effect is too small, and the heat retention effect is no different from the conventional case of using a single substance such as rice husk or roasted rice husk. Also, if it exceeds 30 parts by weight, the expansion will be too large and there will be a lot of unevenness if it is not evenly distributed on the surface of the hot water. This is because problems such as the coating tends to be uneven and the amount of scattering during spraying occur.
粒度分布は、籾殻、焼き籾殻については市場に出されて
いるもので特記する必要はないが、コークス、無煙炭等
の炭素質物質を用いる場合は、細かすぎると粉塵になり
やすく、又、大きすぎると加熱膨張性物質の膨張を阻害
するので、適当な粒度としては人体０．１〜２ｍｍとす
るのが良く、加熱膨張性物質については０，１〜３龍の
ものが良い。There is no need to specify the particle size distribution for rice husks and burnt rice husks as they are available on the market, but when using carbonaceous materials such as coke and anthracite, if the particle size distribution is too fine, it will easily become dust, and if it is too large. Since this inhibits the expansion of the heat-expandable material, the appropriate particle size is preferably 0.1 to 2 mm for the human body, and 0.1 to 3 mm for the heat-expandable material.
〔実施例１〕
焼き籾殻１００重量部に対し膨張黒鉛を４重量部配合し
た本発明の保温剤を溶融したダクタイル鋳鉄１６トンが
収容された取鍋の溶鉄上面２０１００ｃｆに１５關の厚
さに３ｋｇ撒布し、従来の焼き籾殻１５ｋｇを７５ｍｍ
の厚みに撒（Ｉｉシた場合と比較した。溶鉄温度を測定
比較した結果下表に示すように保温効果は従来の焼き籾
殻１５ｋｇを使用した場合と大差ない結果となり、コス
トも低く、且つ、排滓時の粉塵も少なく、本発明の効果
を発揮した。尚本発明の保温剤は撒布し加熱された後２
倍の厚みに膨張した。[Example 1] 16 tons of ductile cast iron containing the heat insulating agent of the present invention containing 4 parts by weight of expanded graphite mixed with 100 parts by weight of roasted rice husk was placed in a ladle containing 16 tons of ductile cast iron. Spread 15 kg of conventional roasted rice husks to 75 mm.
As a result of measuring and comparing the molten iron temperature, as shown in the table below, the heat retention effect is not much different from the conventional case of using 15 kg of roasted rice husks, and the cost is low, and The effect of the present invention was demonstrated as there was less dust during the slag discharge.The heat insulating agent of the present invention was sprayed and heated.
It expanded to twice its thickness.
〔実施例２〕
焼き籾殻５０重二部と粒径が０．１〜２ｎ＋ｒ＠のらの
８５％、０．１龍未満のもの１５重ＭＬ ９ａからなる
コークス粉５０重量部と、酸処理膨張黒鉛゛３重量部を
配合した本発明の保温剤を、取鍋内に収容された６０ｔ
のステンレス鋼溶鋼上面４３７００Ｃ−に３５１１１１
の厚みに１５ｋｇ撒布し、一方従来の焼き籾殻６０ｋｇ
を１３５ｍｍの厚みに撒布し、６０〜７０分を経過して
取鍋から出鋼する時の溶鋼温度を測定し比較した結果、
いずれも１５６５〜１５７５℃で差は認められず、コス
トは従来の８０％で済み、又粉塵も減少して居り本発明
の効果が確認された。尚本発明の保温剤は撒布、加熱後
１．６倍の厚みに膨張していた。[Example 2] 50 parts by weight of coke powder consisting of 50 parts by weight of roasted rice husks and 15 parts by weight of coke powder with a particle size of 0.1 to 2n+r @ 85% and less than 0.1 times ML 9a, and acid treatment expansion. 60 tons of the heat insulating agent of the present invention containing 3 parts by weight of graphite was placed in a ladle.
Stainless steel molten steel top surface 43700C-351111
15kg of rice husks were spread to the thickness of
As a result of measuring and comparing the temperature of molten steel when it was poured from a ladle after 60 to 70 minutes after spreading it to a thickness of 135 mm,
In both cases, no difference was observed between 1565 and 1575°C, the cost was 80% of the conventional cost, and dust was also reduced, confirming the effectiveness of the present invention. The heat retaining agent of the present invention expanded to 1.6 times the thickness after being sprayed and heated.
〔実施例３〕
粒径０．１〜１ｍｍのものを７０重量％含有する無煙炭
１００重量部に蛭石２５重量部を配合した本発明の保温
剤を１０ｔの取鍋的溶鋼上面１６５００ｃｍに２０■ｍ
の厚みに３ｋｇ撒布した場合と、従来の焼き籾殻１０ｋ
ｇを１．０ｍｍの厚みに撒布した場合とを比較した結果
、４０分経過後の溶鋼温度の低下はいずれも２５〜３５
℃の範囲内にあり、保温性はいずれも差が無いことが確
認された。尚本発明の保温剤は撒布、加熱後１．７倍の
厚みに膨張していた。[Example 3] The heat insulating agent of the present invention, which is made by blending 25 parts by weight of vermiculite with 100 parts by weight of anthracite containing 70% by weight of particles with a grain size of 0.1 to 1 mm, was poured into a 16,500 cm upper surface of 10 tons of molten steel for 20 cm. m
When spreading 3 kg to the thickness of
As a result of comparing the case where g is spread to a thickness of 1.0 mm, the decrease in molten steel temperature after 40 minutes was 25 to 35 mm.
℃ range, and it was confirmed that there was no difference in heat retention in either case. The heat insulating agent of the present invention expanded to 1.7 times the thickness after being sprayed and heated.
本発明による保温剤は、籾殻、焼き籾殻等の使用量を従
来の１／３〜１１５の量に減少させ、保温効果を損なう
ことなく、溶融金属ｑｔ位重量当りの保温剤のためのコ
ストを２０〜２７９６削減でき、又、撒布量や粉塵発生
も減少でき作業環境の改善、作業性の向上をはかりうる
等の効果を有する。The heat insulating agent according to the present invention reduces the amount of rice husk, roasted rice husk, etc. used to 1/3 to 115 of the conventional amount, and reduces the cost of the heat insulating agent per qt of molten metal without impairing the heat insulating effect. 20 to 2,796 can be reduced, and the amount of spraying and dust generation can also be reduced, which has the effect of improving the working environment and workability.
Claims (1)
又は、複数種を組合せたもの１００重量部に対し、酸処
理黒鉛、蛭石、真珠岩等の加熱膨張性物質１〜３０重量
部とを配合して成ることを特徴とする溶融金属用保温剤
。1 to 30 parts by weight of heat-expandable substances such as acid-treated graphite, vermiculite, nacre, etc. per 100 parts by weight of one or a combination of carbon-based aggregates such as rice husks, burnt rice husks, coke, anthracite, etc. A heat insulating agent for molten metal characterized by being made of a mixture of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13637289A JPH032307A (en) | 1989-05-30 | 1989-05-30 | Heat retaining agent for molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13637289A JPH032307A (en) | 1989-05-30 | 1989-05-30 | Heat retaining agent for molten metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH032307A true JPH032307A (en) | 1991-01-08 |
Family
ID=15173624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13637289A Pending JPH032307A (en) | 1989-05-30 | 1989-05-30 | Heat retaining agent for molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH032307A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007260741A (en) * | 2006-03-29 | 2007-10-11 | Jfe Steel Kk | Method of starting continuous casting of molten steel |
| JP2007537882A (en) * | 2004-05-19 | 2007-12-27 | メタコン ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for processing molten metal |
| CN100421836C (en) * | 2005-12-27 | 2008-10-01 | 宝山钢铁股份有限公司 | Granular carbonization rice husk covering agent |
| JP2009204609A (en) * | 2008-01-30 | 2009-09-10 | Jfe Steel Corp | Method for testing expansivity of coal |
| CN103361034A (en) * | 2013-07-17 | 2013-10-23 | 河北联合大学 | Irregular-particle-shaped Chinese chestnut involucre heat-preserving material |
| CN108145108A (en) * | 2017-12-30 | 2018-06-12 | 蒋文明 | A kind of tundish covering flux |
-
1989
- 1989-05-30 JP JP13637289A patent/JPH032307A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007537882A (en) * | 2004-05-19 | 2007-12-27 | メタコン ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for processing molten metal |
| CN100421836C (en) * | 2005-12-27 | 2008-10-01 | 宝山钢铁股份有限公司 | Granular carbonization rice husk covering agent |
| JP2007260741A (en) * | 2006-03-29 | 2007-10-11 | Jfe Steel Kk | Method of starting continuous casting of molten steel |
| JP2009204609A (en) * | 2008-01-30 | 2009-09-10 | Jfe Steel Corp | Method for testing expansivity of coal |
| CN103361034A (en) * | 2013-07-17 | 2013-10-23 | 河北联合大学 | Irregular-particle-shaped Chinese chestnut involucre heat-preserving material |
| CN103361034B (en) * | 2013-07-17 | 2014-07-09 | 河北联合大学 | Irregular-particle-shaped Chinese chestnut involucre heat-preserving material |
| CN108145108A (en) * | 2017-12-30 | 2018-06-12 | 蒋文明 | A kind of tundish covering flux |
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