JPH06226410A - Insulating material for molten steel - Google Patents
Insulating material for molten steelInfo
- Publication number
- JPH06226410A JPH06226410A JP1494593A JP1494593A JPH06226410A JP H06226410 A JPH06226410 A JP H06226410A JP 1494593 A JP1494593 A JP 1494593A JP 1494593 A JP1494593 A JP 1494593A JP H06226410 A JPH06226410 A JP H06226410A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- insulating material
- magnesia
- cement
- heat retaining
- 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
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、製鋼工程で用いられ
る、取鍋等の容器内に収容した溶鋼の温度降下を防ぐた
めの保温剤に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat retaining agent used in a steelmaking process for preventing the temperature drop of molten steel contained in a container such as a ladle.
【０００２】[0002]
【従来の技術】溶鋼保温剤として、従来、有機質を焼成
したもの（例えば、焼き籾殻、パルプ屑）と、SiO2を主
成分とする無機質のもの（例えば、パーライト）が用い
られてきた。保温剤として必要な性質は、断熱保温性が
大であること、溶鋼に投入する際に粉塵が発生しないも
のであること、溶鋼に対して炭素とケイ素が入り込まな
いものであること、などが要求されている。2. Description of the Related Art Conventionally, as molten steel heat retaining agents, ones obtained by firing an organic substance (for example, burned rice husks, pulp scraps) and ones by an inorganic substance having SiO 2 as a main component (for example, pearlite) have been used. The properties required as a heat retaining agent are that it has a large heat insulating and heat retaining property, that it does not generate dust when charged into molten steel, and that carbon and silicon do not enter into molten steel. Has been done.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、焼き籾
殻は、微細で軽いために溶鋼面に投入する際に飛散しや
すく、加炭しやすいという難点がある。 また、SiO2を
主成分とするものは、ケイ素量を高めるという危険があ
る。 さらに、CaO 、MgO を主成分とするものは、嵩比
重が高く保温性に劣るという欠点がある。また、これら
を複合した保温剤も提案されているが、それぞれの成分
の調整が難しく、コストが高くなるなどの問題があっ
た。However, since the chaff is fine and light, the chaff tends to scatter when charged on the surface of molten steel and to be easily carburized. Further, those containing SiO 2 as a main component have a risk of increasing the amount of silicon. Further, those containing CaO 2 and MgO 2 as main components have a drawback that they have high bulk specific gravity and poor heat retention. Further, a heat retaining agent in which these are combined has also been proposed, but there is a problem that it is difficult to adjust each component and the cost increases.
【０００４】本発明は、保温剤の溶融温度を調整して保
温効果を高め、粉塵の発生を抑えて作業性を良くし、炭
素、ケイ素による鋼の汚染を防止する保温剤に係わるも
のである。The present invention relates to a heat retaining agent which adjusts the melting temperature of the heat retaining agent to enhance the heat retaining effect, suppresses generation of dust to improve workability, and prevents steel from being contaminated by carbon and silicon. .
【０００５】[0005]
【課題を解決するための手段】すなわち、本発明は消石
灰又はカーバイド滓１０〜４０重量％、セメント３０〜
６０重量％、及びマグネシア１０〜５０重量％を含有し
てなり、かつそれぞれの一次粒子径が１mm以下のものを
成形した成形物であることを特徴とする溶鋼保温剤であ
る。That is, the present invention relates to slaked lime or carbide slag 10 to 40% by weight and cement 30 to 30% by weight.
It is a molten steel heat retaining agent comprising 60% by weight and 10 to 50% by weight of magnesia, which is a molded product formed by molding each having a primary particle diameter of 1 mm or less.
【０００６】本発明に用いられる消石灰は、生石灰に水
を注いで消化して造られるものであり、従来の保温剤と
して用いられる生石灰の代わりの成分である。 生石灰
は、吸湿して消石灰となりやすく保存に問題がある。[0006] The slaked lime used in the present invention is produced by pouring water into quick lime and digesting it, and is an alternative component of quick lime used as a conventional heat retaining agent. Quicklime easily absorbs moisture and becomes slaked lime, which is problematic in storage.
【０００７】また、本発明に用いられるカーバイド滓
は、カルシウムカーバイドに水を反応させてアセチレン
ガスが発生した残留物で、水酸化カルシウム Ca(OH)2９
５％以上からなっており、市販の消石灰 Ca(OH)2９６％
とは成分、粒子径もほぼ同じものである。以下、消石灰
を例にとって本発明を説明する。The carbide slag used in the present invention is a residue in which acetylene gas is generated by reacting calcium carbide with water, and calcium hydroxide Ca (OH) 2 9
5% or more, commercially available slaked lime Ca (OH) 2 96%
And have almost the same components and particle diameters. Hereinafter, the present invention will be described by taking slaked lime as an example.
【０００８】本発明の溶鋼保温剤において、消石灰が１
０重量％未満では、保温剤の溶融温度が低くなり、結果
として溶鋼の保温効果が劣るので好ましくない。 加え
て、ケイ素が入り込むので好ましくない。また、消石灰
が４０重量％を越えた場合は、防塵効果が低下し好まし
くない。加えて、溶鋼の保温効果が劣るので好ましくな
い。In the molten steel heat retaining agent of the present invention, slaked lime is 1
If it is less than 0% by weight, the melting temperature of the heat retaining agent becomes low, and as a result, the heat retaining effect of the molten steel becomes poor, which is not preferable. In addition, silicon is included, which is not preferable. On the other hand, when the content of slaked lime exceeds 40% by weight, the dustproof effect is lowered, which is not preferable. In addition, the heat retaining effect of molten steel is poor, which is not preferable.
【０００９】本発明に用いられるセメントは、カルシウ
ムシリケート系成分、またはカルシウムアルミネート系
成分を供給し、成形物のバインダーとして働くものであ
る。保温剤に配合されるセメントは、ポルトランドセメ
ント、高炉セメント、シリカセメント、フライアッシュ
セメント、アルミナセメント、カルシウムアルミネート
系セメント等がある。The cement used in the present invention supplies a calcium silicate-based component or a calcium aluminate-based component and acts as a binder for a molded product. Cement to be added to the heat retaining agent includes Portland cement, blast furnace cement, silica cement, fly ash cement, alumina cement, calcium aluminate cement and the like.
【００１０】本発明の溶鋼保温剤において、セメントが
３０重量％未満では、防塵効果が低下するので好ましく
ない。 加えて、溶鋼の保温効果も劣る。また、セメン
トが６０重量％を越えた場合、保温剤の溶融温度が低く
なり、結果として溶鋼の保温効果が劣るので好ましくな
い。加えて、ケイ素が入り込むので好ましくない。In the molten steel heat retaining agent of the present invention, if the amount of cement is less than 30% by weight, the dustproof effect is lowered, which is not preferable. In addition, the heat retaining effect of molten steel is also poor. Further, when the amount of cement exceeds 60% by weight, the melting temperature of the heat retaining agent becomes low, and as a result, the heat retaining effect of the molten steel deteriorates, which is not preferable. In addition, silicon is included, which is not preferable.
【００１１】本発明に用いられるマグネシアは、溶融点
が高く、溶鋼を汚染しないので、従来から保温剤成分と
して用いられてきた。マグネシア源としては、マグネシ
アクリンカー、苛性マグネシア、溶融マグネシア、ペリ
クレース、タルク、マグネサイト、水滑石等が上げられ
る。The magnesia used in the present invention has a high melting point and does not contaminate the molten steel, so that it has been conventionally used as a heat retaining agent component. Examples of magnesia sources include magnesia clinker, caustic magnesia, molten magnesia, periclase, talc, magnesite, and hydrotalcite.
【００１２】本発明の溶鋼保温剤において、マグネシア
が１０重量％未満では、保温剤の溶融温度が低くなり、
結果として溶鋼の保温効果が低下するので好ましくな
い。加えて、ケイ素が入り込むので好ましくない。ま
た、マグネシアが５０重量％を越えた場合、防塵効果が
低下するので好ましくない。 加えて、溶鋼の保温効果
が劣るので好ましくない。In the molten steel heat retaining agent of the present invention, when the magnesia is less than 10% by weight, the melting temperature of the heat retaining agent becomes low,
As a result, the heat retaining effect of the molten steel decreases, which is not preferable. In addition, silicon is included, which is not preferable. Further, when the magnesia exceeds 50% by weight, the dustproof effect is deteriorated, which is not preferable. In addition, the heat retaining effect of molten steel is poor, which is not preferable.
【００１３】このように、本発明の溶鋼保温剤は、消石
灰、セメント、及びマグネシアを主成分として構成され
るが、残部としてアルミナ等を１〜４重量％含有しても
さしつかえない。As described above, the molten steel heat retaining agent of the present invention is composed mainly of slaked lime, cement, and magnesia, but it is acceptable to contain 1 to 4% by weight of alumina or the like as the balance.
【００１４】次に、本発明の溶鋼保温剤は、構成する消
石灰又はカーバイド滓、セメント、マグネシアのそれぞ
れの一次粒子径が１mm以下のものを成形した成形物であ
る。Next, the molten steel heat retaining agent of the present invention is a molded product obtained by molding slaked lime or carbide slag, cement and magnesia each having a primary particle diameter of 1 mm or less.
【００１５】それぞれの一次粒子径が１mmを越えた場合
は、消石灰、セメント、マグネシアの均一な混合が充分
でないため成分の偏りが生じ、保温剤が溶融して保温効
果が低下するので好ましくない。また、成分の偏りによ
り、成形が充分でなくなり、粉塵の発生が生じやすく、
防塵効果が低下するので好ましくない。If the primary particle diameter exceeds 1 mm, the uniform mixing of slaked lime, cement and magnesia is not sufficient, resulting in uneven distribution of the components, and the heat retaining agent is melted to lower the heat retaining effect, which is not preferable. In addition, due to the uneven distribution of the components, the molding becomes insufficient and dust is likely to be generated,
This is not preferable because the dustproof effect is reduced.
【００１６】本発明の溶鋼保温剤は、各成分の偏りを防
止し、粉塵の発生を抑えるため、成形物として用いる。
成形物としては、造粒するか、または成形後破砕した
状態であれば、その形状を問わない。The molten steel heat retaining agent of the present invention is used as a molded product in order to prevent uneven distribution of each component and suppress generation of dust.
The shape of the molded product is not limited as long as it is granulated or crushed after molding.
【００１７】本発明の溶鋼保温剤の製造方法は、例えば
所定量の消石灰とセメントとマグネシアとをボールミ
ル、振動ミル、ローラミル等で粉砕し、１mm以下に篩い
分け、次にドラム型、パン型、押し出し型等の成形機を
用い、バインダーとして水、水ガラス、ポリビニルアル
コール水溶液、メチルセルローズ水溶液等を１５〜７０
重量％の範囲で加えて成形する。これを乾燥し、２〜３
０mmの成形物とする。もう一つの製造方法として、１mm
以下に篩い分けた原料混合物に、上記バインダーを１５
〜７０重量％加えて、乾燥固化し、これを破砕機で破砕
し、２〜３０mmの成形物とする。In the method for producing a molten steel heat retaining agent of the present invention, for example, a predetermined amount of slaked lime, cement and magnesia are crushed by a ball mill, a vibration mill, a roller mill or the like and sieved to 1 mm or less, then a drum type, a pan type, Using a molding machine such as an extrusion type machine, water, water glass, aqueous solution of polyvinyl alcohol, aqueous solution of methylcellulose, etc. are used as a binder for 15 to 70.
Add and mold in the range of wt%. Dry this, 2-3
The molded product is 0 mm. Another manufacturing method is 1mm
15 parts of the above-mentioned binder was added to the raw material mixture screened below.
˜70 wt% is added, dried and solidified, and crushed by a crusher to give a molded product of 2 to 30 mm.
【００１８】[0018]
【実施例】消石灰（市販品、Ca(OH)2 ９6.１％、最大粒
径0.８mm）、普通ポルトランドセメント（市販品、SiO2
２2.０％、最大粒径0.３mm）、マグネシアクリンカー
（市販品、MgO ９3.０％、最大粒径0.５mm）を用いて、
本発明の所定量を混合粉砕し、１mm以下に篩い分け、次
にパン型造粒機を用い、バインダーとして水を４０重量
％を加えて造粒した。 その後乾燥し、約１０mmの造粒
物を調整した。次に、この保温剤を溶鋼（市販品、SS4
1、mpt １６００℃）の上に、溶鋼１ｔ当たり１.0Kg投
入した。 保温剤投入後、溶鋼温度が１６００℃から１
５５０℃までの冷却時間、投入時の保温剤の発塵状態の
観察結果、及び保温剤投入前後の溶鋼のケイ素、炭素の
分析値を求めた。ただし、発塵状態を表すために、○は
殆ど発塵していない状態、△は少し発塵している状態、
×は発塵している状態を示すものとする。以上の結果を
表１に示す。 同表中の実験番号１〜８は本発明の実施
例を示し、実験番号９〜１８は本発明の比較例、実験番
号１９〜２０は従来の保温剤による比較例、実験番号２
１は保温剤無添加の比較例を示す。同表中のセメントは
普通ポルトランドセメント、マグネシアはマグネシアク
リンカーを示し、従来の保温剤として、パーライト（市
販品、SiO2７4.０％、Al2O 3 １6.０％、粒径５mm）、焼
き籾殻（市販品、SiO2４0.０％、 C４5.０％、粒径１mm
以下）を用いた。[Example] Slaked lime (commercial product, Ca (OH)296.1%, maximum grain
0.8 mm diameter, ordinary Portland cement (commercial item, SiO2
22.0%, maximum particle size 0.3mm), magnesia clinker
(Commercial product, MgO 93.0%, maximum particle size 0.5 mm)
A predetermined amount of the present invention is mixed and pulverized, sieved to 1 mm or less, and then
Using a pan-type granulator, 40 weight of water as a binder
% Was added for granulation. Then dry and granulate to about 10 mm
I adjusted things. Next, apply this heat retaining agent to molten steel (commercial product, SS4
1, mpt 1600 ℃), 1.0kg per 1t of molten steel
I entered. After the heat insulating agent was added, the molten steel temperature increased from 1600 ° C to 1
Cooling time up to 550 ℃,
Observed results and of the silicon and carbon of molten steel before and after adding the heat insulating agent
The analytical value was determined. However, in order to show the dust generation state, ○ is
Almost no dust is generated, △ is a little dust is generated,
X indicates that dust is generated. The above results
It shows in Table 1. Experiment Nos. 1 to 8 in the table are the implementations of the present invention.
Examples are shown, and experiment numbers 9 to 18 are comparative examples of the present invention, and experiment numbers.
Nos. 19 to 20 are comparative examples using a conventional heat retaining agent, Experiment No. 2
Reference numeral 1 shows a comparative example in which no heat insulating agent was added. The cement in the table is
Ordinary Portland cement, magnesia is magnesiac
Linker is shown as a traditional warming agent, perlite
Merchandise, SiO274.0%, Al2O 316.0%, grain size 5 mm), baked
Rice husk (commercial item, SiO240.0%, C45.0%, particle size 1mm
The following) was used.
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【発明の効果】本発明による溶鋼保温剤は、溶鋼の保温
効果に優れ、粉塵の発生が少ないので作業性にも優れて
おり、かつ鋼中の炭素、ケイ素、水素等の汚染が見られ
ないので、製鋼工程における、保温の必要な容器内のい
かなる溶鋼にも適用できるものである。INDUSTRIAL APPLICABILITY The molten steel heat retaining agent according to the present invention has an excellent heat retaining effect on molten steel and is excellent in workability because it produces little dust, and is free from contamination by carbon, silicon, hydrogen, etc. in the steel. Therefore, it can be applied to any molten steel in a container that needs to be kept warm in the steelmaking process.
Claims (1)
％、セメント３０〜６０重量％、及びマグネシア１０〜
５０重量％を含有してなり、かつそれぞれの一次粒子径
が１mm以下のものを成形した成形物であることを特徴と
する溶鋼保温剤。1. Slaked lime or carbide slag 10 to 40% by weight, cement 30 to 60% by weight, and magnesia 10 to 10.
A molten steel heat retaining agent comprising 50% by weight and a molded product formed by molding each having a primary particle diameter of 1 mm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1494593A JPH06226410A (en) | 1993-02-01 | 1993-02-01 | Insulating material for molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1494593A JPH06226410A (en) | 1993-02-01 | 1993-02-01 | Insulating material for molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06226410A true JPH06226410A (en) | 1994-08-16 |
Family
ID=11875112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1494593A Pending JPH06226410A (en) | 1993-02-01 | 1993-02-01 | Insulating material for molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06226410A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100521454B1 (en) * | 1998-12-29 | 2006-01-27 | 재단법인 포항산업과학연구원 | Manufacture method of calcium silicate plate using seawater magnesia waste as lime raw material |
| CN101811178A (en) * | 2010-04-16 | 2010-08-25 | 马宪忠 | Self-heating type thermal insulation covering agent |
| JP2015196629A (en) * | 2014-04-02 | 2015-11-09 | ゴウダ株式会社 | Heat insulator for fusion furnace, production method of heat insulator for fusion furnace, and heat insulation method of fusion furnace |
| CN106077546A (en) * | 2016-08-25 | 2016-11-09 | 贺州市创伟冶金耐材有限公司 | A kind of covering slag in steelmaking process |
| CN107855479A (en) * | 2017-12-08 | 2018-03-30 | 攀枝花钢城集团有限公司 | A kind of molten steel covering agent and its production method |
| CN108145107A (en) * | 2017-06-27 | 2018-06-12 | 贺州市创伟冶金耐材有限公司 | A kind of low viscosity crystallizer protecting residue |
-
1993
- 1993-02-01 JP JP1494593A patent/JPH06226410A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100521454B1 (en) * | 1998-12-29 | 2006-01-27 | 재단법인 포항산업과학연구원 | Manufacture method of calcium silicate plate using seawater magnesia waste as lime raw material |
| CN101811178A (en) * | 2010-04-16 | 2010-08-25 | 马宪忠 | Self-heating type thermal insulation covering agent |
| JP2015196629A (en) * | 2014-04-02 | 2015-11-09 | ゴウダ株式会社 | Heat insulator for fusion furnace, production method of heat insulator for fusion furnace, and heat insulation method of fusion furnace |
| CN106077546A (en) * | 2016-08-25 | 2016-11-09 | 贺州市创伟冶金耐材有限公司 | A kind of covering slag in steelmaking process |
| CN108145107A (en) * | 2017-06-27 | 2018-06-12 | 贺州市创伟冶金耐材有限公司 | A kind of low viscosity crystallizer protecting residue |
| CN107855479A (en) * | 2017-12-08 | 2018-03-30 | 攀枝花钢城集团有限公司 | A kind of molten steel covering agent and its production method |
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