JP2001192718A - Steel additive - Google Patents
Steel additiveInfo
- Publication number
- JP2001192718A JP2001192718A JP2000004649A JP2000004649A JP2001192718A JP 2001192718 A JP2001192718 A JP 2001192718A JP 2000004649 A JP2000004649 A JP 2000004649A JP 2000004649 A JP2000004649 A JP 2000004649A JP 2001192718 A JP2001192718 A JP 2001192718A
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- JP
- Japan
- Prior art keywords
- steel additive
- carbon black
- powder
- inorganic
- cao
- 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.)
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鉄鋼添加剤に関す
る。詳しくは、高脱硫性能、スラグ処理時の安全性及び
炉材などへの非腐食性のバランスに優れ、溶銑脱硫剤と
して好適な鉄鋼添加剤に関する。The present invention relates to steel additives. Specifically, the present invention relates to a steel additive which is excellent in balance between high desulfurization performance, safety during slag treatment, and non-corrosiveness to furnace materials, and is suitable as a hot metal desulfurizing agent.
【０００２】[0002]
【従来の技術】従来、溶銑脱硫剤については、主として
カルシウムカ−バイド系、石灰系、ソ−ダ灰系のものが
実用化されているが、いずれも一長一短がある。2. Description of the Related Art Conventionally, as a hot metal desulfurizing agent, calcium carbide-based, lime-based and soda-ash-based ones have been put to practical use, but each has advantages and disadvantages.
【０００３】カルシウムカ−バイド系脱硫剤は、強力な
脱硫性能を有しているが、脱硫スラグの後処理において
アセチレンガスが発生する等の安全性に問題がある。ま
た、高価であり、危険物でもあるので取扱に制約を受け
る。[0003] Calcium carbide-based desulfurizing agents have strong desulfurizing performance, but have a problem in safety such as generation of acetylene gas in post-treatment of desulfurized slag. In addition, since it is expensive and dangerous, handling is restricted.
【０００４】石灰系脱硫剤は安価であるが、高脱硫を行
うには、多量に添加する必要があり、スラグの発生量が
多くなる。また、脱硫剤を添加すると溶銑温度が著しく
低下するので、金属アルミニウムや金属マグネシウム等
の高価な昇温剤を加えたり、また、石灰の融点が高いの
で、蛍石等の融点降下剤を添加しなければならない。[0004] Lime-based desulfurizing agents are inexpensive, but in order to perform high desulfurization, they must be added in large amounts, and the amount of slag generated increases. In addition, the addition of a desulfurizing agent significantly lowers the temperature of the hot metal, so an expensive heating agent such as metal aluminum or metal magnesium is added, or a melting point depressant such as fluorite is added because the melting point of lime is high. There must be.
【０００５】ソ−ダ灰系脱硫剤も比較的安価ではある
が、高アルカリ性であるので炉材の耐火物を損傷させる
危険が大きい。また、排ガスに混入したＮａの除去処理
が必要となり、更にはＮａ2Ｏ含有量の多いスラグが発
生するので、セメント原料等への再利用には限度があっ
た。[0005] Soda ash desulfurizing agents are also relatively inexpensive, but are highly alkaline and pose a great risk of damaging refractories of furnace materials. In addition, it is necessary to remove Na mixed in the exhaust gas, and slag containing a large amount of Na 2 O is generated.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記に鑑み
てなされたものであり、その目的は、高脱硫性能、炉材
への非腐食性、及びスラグ処理時の高安全性のバランス
に優れた鉄鋼添加剤を提供することである。SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has as its object to balance high desulfurization performance, noncorrosiveness to furnace materials, and high safety during slag treatment. It is to provide an excellent steel additive.
【０００７】[0007]
【課題を解決するための手段】すなわち、本発明は、無
機粉末９０〜９９％と０．０３２ｍｍ下のカーボンブラ
ック粉末１〜１０％とを含有してなり、上記無機粉末は
ＣａＯ１０〜９４％と、ＣａＣＮ2３〜８７％と、Ｃａ
Ｏ、ＣａＣＮ2、０．０３２ｍｍ下のカーボンブラック
粉末以外の無機質物質３〜８７％とから構成されてなる
ものであることを特徴とする鉄鋼添加剤である。That is, the present invention comprises 90 to 99% of an inorganic powder and 1 to 10% of a carbon black powder below 0.032 mm, and the inorganic powder contains 10 to 94% of CaO. , CaCN 2 3-87%, Ca
An iron or steel additive comprising O, CaCN 2 , and 3 to 87% of an inorganic substance other than carbon black powder below 0.032 mm.
【０００８】[0008]
【発明の実施の態様】以下、更に詳しく本発明について
説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.
【０００９】本発明の鉄鋼添加剤において、無機粉末が
９０％未満、０．０３２ｍｍ下のカーボンブラック粉末
が１０％を超えると、カーボンブラック粉末の酸化によ
り生成した二酸化炭素がＣａＣＮ2と反応して、高脱硫
率を達成することができない。また、無機粉末が９９％
を超え、０．０３２ｍｍ下のカーボンブラック粉末が１
％未満の場合、分散効果が得られず、高脱硫率を達成す
ることができない。無機粉末の粒度は、１０ｍｍ以下で
あることが好ましい。In the steel additive of the present invention, when the content of the inorganic powder is less than 90% and the content of the carbon black powder of 0.032 mm or less exceeds 10%, carbon dioxide generated by oxidation of the carbon black powder reacts with CaCN 2. , Cannot achieve a high desulfurization rate. In addition, 99% of inorganic powder
Over 0.032 mm of carbon black powder
%, The dispersing effect cannot be obtained and a high desulfurization rate cannot be achieved. The particle size of the inorganic powder is preferably 10 mm or less.
【００１０】鉄鋼添加剤の無機粉末において、ＣａＣＮ
2が３％未満であるか、又はＣａＯが９４％を超える
と、鉄鋼添加剤の溶融性が低下し、高脱硫率を達成する
ことができなくなる。また、ＣａＣＮ2が８７％を超え
るか、又はＣａＯが１０％未満であると、鉄鋼添加剤の
溶銑への分散性が悪化し、これまた高脱硫率を達成する
ことができなくなる。好ましいＣａＯ含有量は３０〜９
４％、ＣａＣＮ2含有量は３〜６７％である。In the inorganic powder of the steel additive, CaCN
If 2 is less than 3%, or if CaO exceeds 94%, the meltability of the steel additive will decrease, and a high desulfurization rate cannot be achieved. If the content of CaCN 2 exceeds 87% or the content of CaO is less than 10%, the dispersibility of the steel additive in hot metal deteriorates, and a high desulfurization rate cannot be achieved. The preferred CaO content is 30 to 9
4%, CaCN 2 content is 3-67%.
【００１１】ＣａＣＮ2としては、合成カルシウムシア
ナミド、市販の工業用カルシウムシアナミド、石灰窒素
等を使用することができる。石灰窒素を用いて本発明の
鉄鋼添加剤を調整する場合は、その組成がＣａＣＮ2 ４
５〜７５％、ＣａＯ１０〜２５％、カーボンブラック以
外の炭素１０〜１５％程度であることを考慮して行われ
る。As CaCN 2 , synthetic calcium cyanamide, commercially available industrial calcium cyanamide, lime nitrogen and the like can be used. When the steel additive of the present invention is adjusted using lime nitrogen, the composition is CaCN 2 4
It is performed in consideration of about 5 to 75%, about 10 to 25% of CaO, and about 10 to 15% of carbon other than carbon black.
【００１２】鉄鋼添加剤の無機粉末において、ＣａＯ、
ＣａＣＮ2、０．０３２ｍｍ下のカーボンブラック粉末
以外の無機質物質が３％未満では、鉄鋼添加剤の昇温作
用、溶銑への分散性が低下し、高脱硫率を達成すること
ができなくなる。また、８７％を超えると、溶銑中での
鉄鋼添加剤近傍の急激な温度上昇による突沸現象、急激
な温度低下による溶銑への分散性の低下により、高脱硫
率を達成することができなくなる。好ましい無機質物質
の含有量は、３〜６７％である。In the inorganic powder of the steel additive, CaO,
If the content of inorganic substances other than the carbon black powder below 0.032 mm of CaCN 2 is less than 3%, the action of increasing the temperature of the steel additive and the dispersibility in hot metal are reduced, and a high desulfurization rate cannot be achieved. On the other hand, if it exceeds 87%, a high desulfurization rate cannot be achieved due to a bumping phenomenon due to a rapid temperature rise near the steel additive in the hot metal and a decrease in dispersibility in the hot metal due to a rapid temperature drop. The preferable content of the inorganic substance is 3 to 67%.
【００１３】無機質物質としては、各種金属の酸化物、
水酸化物、炭酸化物、フッ化物、炭化物、塩化物及びＡ
ｌ、Ｍｇ、Ｃａ、Ｓｉ、Ｍｎ、Ｆｅの金属ないしは、こ
れら金属成分の少なくとも一種を主成分とする合金、及
び０．０３２ｍｍ下のカーボンブラック粉末以外の炭素
質物質から選ばれた一種以上である。ここで、各種金属
の種類としては、Ｎａ、Ｋ、Ｍｇ、Ｃａ、Ｍｎ、Ｆｅ、
Ａｌ、Ｓｉ等であり、合金としては、ＣａＳｉ、ＦｅＳ
ｉ、ＦｅＭｎ、ＳｉＭｎ等であり、炭素質物質として
は、炭素、黒鉛、コークス、タール、ピッチ、石炭、
０．０３２ｍｍ上のカーボンブラック粉末等である。As the inorganic substance, oxides of various metals,
Hydroxide, carbonate, fluoride, carbide, chloride and A
l, Mg, Ca, Si, Mn, Fe, or at least one selected from alloys containing at least one of these metal components as main components and carbonaceous substances other than carbon black powder of 0.032 mm or less. . Here, types of various metals include Na, K, Mg, Ca, Mn, Fe,
Al, Si, etc., and alloys such as CaSi, FeS
i, FeMn, SiMn, etc., and carbonaceous materials include carbon, graphite, coke, tar, pitch, coal,
0.032 mm of carbon black powder or the like.
【００１４】これらの無機質物質において、金属ないし
は合金と炭素質物質は昇温分散剤として、各種金属の酸
化物、水酸化物、炭酸化物は分散剤として、またフッ化
物、炭化物、塩化物は脱硫反応を活性化させる脱硫助剤
として機能する。Among these inorganic substances, metals or alloys and carbonaceous substances are used as temperature raising dispersants, oxides, hydroxides and carbonates of various metals are used as dispersants, and fluorides, carbides and chlorides are desulfurized. It functions as a desulfurization aid that activates the reaction.
【００１５】本発明において、好適な無機質物質は、Ａ
ｌ、Ｓｉ、Ｍｇ、Ｃａの金属ないしはこれら金属成分の
少なくとも一種を主成分とする合金、炭素、黒鉛、コー
クス、石炭の炭素質物質、ＦｅＯ、Ｆｅ2Ｏ3、Ａｌ
2Ｏ3、ＳｉＯ2、ＭｇＯ、Ｃａ（ＯＨ）2、Ｍｇ（ＯＨ）
2、ＣａＣＯ3、ＭｇＣＯ3、Ｎａ2ＣＯ3、ＣａＦ2、Ｍｇ
Ｆ2、ＮａＦの無機化合物である。特に、無機質物質に
は、０．０３２ｍｍ下のカーボンブラック粉末以外の炭
素質物質が含まれることが望ましい。In the present invention, a preferable inorganic substance is A
l, Si, Mg, Ca metal or an alloy mainly containing at least one of these metal components, carbon, graphite, coke, carbonaceous substance of coal, FeO, Fe 2 O 3 , Al
2 O 3 , SiO 2 , MgO, Ca (OH) 2 , Mg (OH)
2 , CaCO 3 , MgCO 3 , Na 2 CO 3 , CaF 2 , Mg
It is an inorganic compound of F 2 and NaF. In particular, it is desirable that the inorganic substance include a carbonaceous substance other than the carbon black powder of 0.032 mm or less.
【００１６】鉄鋼添加剤の０．０３２ｍｍ下のカーボン
ブラック粉末としては、ファーネスブラック、チャンネ
ルブラック、アセチレンブラック、ランプブラック等を
使用することができる。As the carbon black powder 0.032 mm below the steel additive, furnace black, channel black, acetylene black, lamp black and the like can be used.
【００１７】[0017]
【実施例】以下、実施例、比較例をあげて、更に具体的
に本発明を説明する。The present invention will be described below more specifically with reference to examples and comparative examples.
【００１８】実施例：実験番号１〜４２、比較例：４３
〜５８Example: Experiment Nos. 1-42, Comparative Example: 43
~ 58
【００１９】合成カルシウムシアナミド（ＣａＣＮ2：
９９％、粒度：１ｍｍ下）、酸化カルシウム（ＣａＯ：
９９％、粒度：１ｍｍ下）、酸化マグネシウム（Ｍｇ
Ｏ：９９％、粒度：１ｍｍ下）、水酸化カルシウム（Ｃ
ａ（ＯＨ）2：９９％、粒度：１ｍｍ下）、炭酸マグネ
シウム（ＭｇＣＯ3：９９％、粒度：１ｍｍ下）、フッ
化カルシウム（ＣａＦ2：９９％、粒度：１ｍｍ下）、
コークス（Ｃ：９８％、粒度：１ｍｍ下）、金属シリコ
ン（Ｓｉ：９９％、粒度：１ｍｍ下）、アセチレンブラ
ック（Ｃ：９９％、粒度：０．０３２ｍｍ下）、カルシ
ウムカ−バイド（ＣａＣ2 :８０％、粒度：１ｍｍ
下）、蛍石（ＣａＦ2：９５％、粒度：１ｍｍ下）、ソ
−ダ灰（Ｎａ2 ＣＯ3：９９％、粒度：１ｍｍ下）を表
１で示す割合で混合し、種々の鉄鋼添加剤を製造した。
各原料は、エアージェット方式により、篩い分けして用
いた。Synthetic calcium cyanamide (CaCN 2 :
99%, particle size: 1 mm below), calcium oxide (CaO:
99%, particle size: under 1 mm), magnesium oxide (Mg
O: 99%, particle size: under 1 mm), calcium hydroxide (C
a (OH) 2 : 99%, particle size: under 1 mm, magnesium carbonate (MgCO 3 : 99%, particle size: under 1 mm), calcium fluoride (CaF 2 : 99%, particle size: under 1 mm),
Coke (C: 98%, particle size: 1 mm under), metal silicon (Si: 99%, particle size: 1 mm under), acetylene black (C: 99%, particle size: 0.032 mm under), calcium Ca - carbide (CaC 2 : 80%, particle size: 1mm
Bottom), fluorite (CaF 2 : 95%, particle size: under 1 mm) and soda ash (Na 2 CO 3 : 99%, particle size: under 1 mm) were mixed in the proportions shown in Table 1, and various steels were added. An agent was manufactured.
Each raw material was sieved and used by an air jet method.
【００２０】合成カルシウムシアナミドは、ジシアンジ
アミド（（Ｈ2ＣＮ2）2：９８％試薬）と炭酸カルシウ
ム（ＣａＣＯ3：９９％試薬）とを等質量混合し、１１
００℃で１時間窒素ガス雰囲気下で加熱合成し、１ｍｍ
以下に粉砕したものを使用した。The synthetic calcium cyanamide is prepared by mixing dicyandiamide ((H 2 CN 2 ) 2 : 98% reagent) and calcium carbonate (CaCO 3 : 99% reagent) in the same mass,
Heat synthesis under nitrogen gas atmosphere at 00 ° C for 1 hour,
The following pulverized material was used.
【００２１】上記で製造された鉄鋼添加剤を、溶銑（温
度１３００℃）に対し、０．１％をＮ2ガスとともに１
分間溶銑に吹き込み、更に空吹きを２分間行って脱硫処
理を行い、次式に従って脱硫率を測定した。なお、銑鉄
の処理前の硫黄濃度は、１５０〜２００ｐｐｍであっ
た。銑鉄中の硫黄濃度は高周波燃焼／赤外吸収法で測定
した。The steel additive prepared above was added in an amount of 0.1% with hot metal (temperature 1300 ° C.) together with N 2 gas.
The hot metal was blown into the hot metal for one minute and then air blown for two minutes to perform a desulfurization treatment. The sulfur concentration before the treatment of pig iron was 150 to 200 ppm. The sulfur concentration in pig iron was measured by a high frequency combustion / infrared absorption method.
【００２２】脱硫率（％）＝（溶銑から除去された硫黄
の質量）×１００／（脱硫処理前の溶銑中の硫黄質量）Desulfurization rate (%) = (mass of sulfur removed from hot metal) × 100 / (mass of sulfur in hot metal before desulfurization treatment)
【００２３】更に、炉材（耐火物）の溶損状態の評価と
して、窒素雰囲気において、溶銑（温度１３００℃）に
対し、２％の鉄鋼添加剤を添加し、この中にアルミナ−
シリカ質レンガ（Ａｌ2Ｏ3：８４％、ＳｉＯ2：１３
％、サイズ：並型）を１時間浸漬後、断面の溶損深さ
（ｍｍ）を測定した。Further, as an evaluation of the erosion state of the furnace material (refractory), in a nitrogen atmosphere, a 2% steel additive was added to the hot metal (temperature 1300 ° C.), and alumina was added to the additive.
Silica brick (Al 2 O 3 : 84%, SiO 2 : 13)
%, Size: normal type) for 1 hour, and then the erosion depth (mm) of the cross section was measured.
【００２４】以上の結果を表１、表２に示す。The above results are shown in Tables 1 and 2.
【００２５】[0025]
【表１】 [Table 1]
【００２６】[0026]
【表２】 [Table 2]
【００２７】[0027]
【発明の効果】本発明によれば、脱硫性能の低下が防止
された、高脱硫性能、炉材への非腐食性、スラグ処理時
の高安全性のバランスに優れたＣａＣＮ2系鉄鋼添加剤
が提供される。本発明の鉄鋼添加剤は、溶銑脱硫剤はも
とより、脱リン剤としても使用することができる。According to the present invention, a CaCN 2 -based steel additive excellent in balance between high desulfurization performance, non-corrosiveness to furnace materials, and high safety during slag treatment, in which a decrease in desulfurization performance is prevented. Is provided. The steel additive of the present invention can be used not only as a hot metal desulfurizing agent but also as a dephosphorizing agent.
Claims (1)
下のカーボンブラック粉末１〜１０％とを含有してな
り、上記無機粉末はＣａＯ１０〜９４％と、ＣａＣＮ2
３〜８７％と、ＣａＯ、ＣａＣＮ2、０．０３２ｍｍ下
のカーボンブラック粉末以外の無機質物質３〜８７％と
から構成されてなるものであることを特徴とする鉄鋼添
加剤。1. An inorganic powder of 90-99% and 0.032 mm
1 to 10% of the following carbon black powder, and the inorganic powder contains 10 to 94% of CaO and CaCN 2
A steel additive comprising 3 to 87% and 3 to 87% of CaO, CaCN 2 , and inorganic substances other than carbon black powder below 0.032 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000004649A JP3909993B2 (en) | 2000-01-13 | 2000-01-13 | Steel additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000004649A JP3909993B2 (en) | 2000-01-13 | 2000-01-13 | Steel additive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001192718A true JP2001192718A (en) | 2001-07-17 |
| JP3909993B2 JP3909993B2 (en) | 2007-04-25 |
Family
ID=18533409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000004649A Expired - Fee Related JP3909993B2 (en) | 2000-01-13 | 2000-01-13 | Steel additive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3909993B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008031538A (en) * | 2006-07-31 | 2008-02-14 | Jfe Mineral Co Ltd | METHOD FOR MANUFACTURING CaO-BASED DESULFURIZING AGENT |
| JP2008031537A (en) * | 2006-07-31 | 2008-02-14 | Jfe Steel Kk | CaO-BASED DESULFURIZING AGENT AND METHOD FOR DESULFURIZING MOLTEN IRON |
-
2000
- 2000-01-13 JP JP2000004649A patent/JP3909993B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008031538A (en) * | 2006-07-31 | 2008-02-14 | Jfe Mineral Co Ltd | METHOD FOR MANUFACTURING CaO-BASED DESULFURIZING AGENT |
| JP2008031537A (en) * | 2006-07-31 | 2008-02-14 | Jfe Steel Kk | CaO-BASED DESULFURIZING AGENT AND METHOD FOR DESULFURIZING MOLTEN IRON |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3909993B2 (en) | 2007-04-25 |
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