JP2001003114A - Additive for steel refining - Google Patents
Additive for steel refiningInfo
- Publication number
- JP2001003114A JP2001003114A JP11176496A JP17649699A JP2001003114A JP 2001003114 A JP2001003114 A JP 2001003114A JP 11176496 A JP11176496 A JP 11176496A JP 17649699 A JP17649699 A JP 17649699A JP 2001003114 A JP2001003114 A JP 2001003114A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- additive
- cao
- cacn2
- steel refining
- 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.)
- Granted
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鉄鋼添加剤、詳し
くは高脱硫性能、高安全性及び炉材等の非腐食性のバラ
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。TECHNICAL FIELD The present invention relates to a steel additive, and more particularly to a steel additive which is excellent in balance between high desulfurization performance, high safety and non-corrosiveness of 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
カルシウムカーバイド系、石灰系、ソーダ灰系のものが
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 into practical use, but each has advantages and disadvantages.
【０００３】カルシウムカーバイド系脱硫剤は、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、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、あるいは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 must be added in large amounts for high desulfurization, and the amount of slag generated increases. In addition, the addition of a desulfurizing agent significantly lowers the hot metal temperature, so an expensive heating agent such as metal aluminum or metal magnesium must be added, or a melting point lowering agent such as fluorite must be added because lime has a high melting point. Must.
【０００５】ソー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、またＮａ2Ｏ含有の高いスラグが発生す
るので、セメント原料等の再利用を行うには限度があっ
た。[0005] Soda ash-based desulfurizing agents are also relatively inexpensive, but are highly alkaline and pose a great risk of damaging refractories of furnace materials. Further, it is necessary to remove Na mixed in the exhaust gas, and slag containing a high content of Na 2 O is generated. Therefore, there is a limit in reusing cement raw materials and the like.
【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
の非腐食性、及び脱硫スラグ処理時の高安全性のバラン
スに優れた溶銑脱硫処理を行うことのできる鉄鋼添加剤
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 an object of the present invention is to balance high desulfurization performance, non-corrosiveness of furnace materials, and high safety during desulfurization slag treatment. An object of the present invention is to provide a steel additive capable of performing excellent hot metal desulfurization treatment.
【０００７】[0007]
【課題を解決するための手段】すなわち、本発明は、Ｃ
ａＯ１０〜９０重量％、ＣａＣＮ2３〜７０重量％、並
びにＣａＯ、ＣａＣＮ2以外の無機質物質５〜７０重量
％を含み、０．２ｍｍ下の粒子が２０重量％以下、２０
ｍｍ上の粒子が１０重量％以下の粒状物からなることを
特徴とする鉄鋼添加剤である。That is, the present invention provides a C
aO10~90 wt%, CaCN 2 3 to 70% by weight, and CaO, comprises 5 to 70 wt% inorganic materials other than CaCN 2, under 0.2mm particle 20 wt% or less, 20
It is a steel additive characterized in that particles on the order of mm comprise particles of 10% by weight or less.
【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、ＣａＣＮ2
が３重量％未満であるか、又はＣａＯが９０重量％をこ
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７０重量
％をこえるか、又はＣａＯが１０重量％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２０〜６０重量％、ＣａＣＮ2 含有量は１０〜５０
重量％である。特に、好ましいＣａＯ含有量は３０〜６
０重量％であり、ＣａＣＮ2含有量は１０〜４０重量％
である。In the steel additive of the present invention, CaCN 2
If it is less than 3% by weight or if CaO exceeds 90% by weight, the meltability of the steel additive will decrease, and a high desulfurization rate cannot be achieved. Further, when CaCN 2 exceeds 70% by weight or CaO is less than 10% by weight,
The dispersibility of the steel additive in the hot metal deteriorates, and a high desulfurization rate cannot be achieved. The preferred CaO content is 20 to 60% by weight, and the CaCN 2 content is 10 to 50%.
% By weight. In particular, the preferred CaO content is 30 to 6
0% by weight, and the content of CaCN 2 is 10 to 40% by weight.
It is.
【００１０】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
鉄鋼添加剤を調製する場合は、その組成がＣａＣＮ2 ４
５〜７５重量％、ＣａＯ１０〜２５重量％、炭素１０〜
１５重量％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 prepared using lime nitrogen, its composition is CaCN 2 4
5 to 75% by weight, 10 to 25% by weight of CaO, 10 to 10% by weight of carbon
It is carried out in consideration of the fact that it is about 15% by weight.
【００１１】本発明の鉄鋼添加剤においては、５〜７０
重量％の無機質物質を含んでいる。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、
炭化物、塩化物及びＡｌ、Ｍｇ、Ｃａ、Ｓｉ、Ｍｎ、Ｆ
ｅ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、ＦｅＳｉ、ＦｅＭｎ、ＳｉＭｎ
等であり、炭素質物質としては、炭素、黒鉛、カーボン
ブラック、コークス、タール、ピッチ、石炭等である。In the steel additive of the present invention, 5 to 70
Contains by weight inorganic materials. Inorganic substances include oxides, hydroxides, carbonates, fluorides, and the like of various metals.
Carbide, chloride and Al, Mg, Ca, Si, Mn, F
e or at least one selected from alloys containing at least one of these metal components as a main component and carbonaceous substances. Here, the types of various metals include Na,
K, Mg, Ca, Mn, Fe, Al, Si, etc., and alloys such as CaSi, FeSi, FeMn, and SiMn
And the carbonaceous material includes carbon, graphite, carbon black, coke, tar, pitch, coal and the like.
【００１２】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.
【００１３】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、カー
ボンブラック、コークス、石炭の炭素質物質、ＦｅＯ、
Ｆｅ2Ｏ3、Ａｌ2Ｏ3、ＳｉＯ 2、ＭｇＯ、Ｃａ（Ｏ
Ｈ）2、Ｍｇ（ＯＨ）2、ＣａＣＯ3、ＭｇＣＯ3、Ｎａ2
ＣＯ 3、ＣａＦ2、ＭｇＦ2、ＮａＦの無機化合物であ
る。特に、無機質物質には、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 these metal components
Alloy, carbon, graphite, car
Bon black, coke, carbonaceous material of coal, FeO,
FeTwoOThree, AlTwoOThree, SiO Two, MgO, Ca (O
H)Two, Mg (OH)Two, CaCOThree, MgCOThree, NaTwo
CO Three, CaFTwo, MgFTwo, An inorganic compound of NaF
You. In particular, inorganic substances include carbonaceous substances
Is desirable.
【００１４】無機質物質の含有量が５重量％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、７０重量％
をこえると、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、２０〜６０重量％
である。When the content of the inorganic substance is less than 5% by weight,
The effect of increasing the temperature of the steel additive and the dispersibility in the hot metal are reduced, and a high desulfurization rate cannot be achieved. 70% by weight
If the temperature exceeds the above range, 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 preferred content of the inorganic substance is 20 to 60% by weight.
It is.
【００１５】本発明の鉄鋼添加剤において、０．２ｍｍ
下の粒子が２０重量％をこえるか、２０ｍｍ上の粒子が
１０重量％をこえると、インジェクション法以外の脱硫
処理法における鉄鋼添加剤の溶融性、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。好ましくは
０．２ｍｍ下の粒子が１０重量％以下、２０ｍｍ上の粒
子が５重量％以下である。特に好ましい粒度構成は、
０．２ｍｍ下が５重量％以下、０．２〜１．４ｍｍが１
０〜６０重量％、１．４〜４ｍｍが３０〜８０重量％、
４〜２０ｍｍが５重量％以下、２０ｍｍ上が５重量％以
下である。In the steel additive of the present invention, 0.2 mm
When the lower particles exceed 20% by weight or the particles above 20mm exceed 10% by weight, the meltability and dispersibility of the steel additive in the desulfurization treatment method other than the injection method decrease,
A high desulfurization rate cannot be achieved. Preferably, particles below 0.2 mm are 10% by weight or less and particles above 20mm are 5% by weight or less. A particularly preferred particle size configuration is
5% by weight or less at 0.2 mm below, 1 at 0.2 to 1.4 mm
0 to 60% by weight, 1.4 to 4mm is 30 to 80% by weight,
4 to 20 mm is 5% by weight or less, and 20 mm above is 5% by weight or less.
【００１６】本発明の鉄鋼添加剤は、インジェクション
法以外の処理方法、例えば、ＫＲ法（カンバラリアクタ
ー法）や置き注ぎ法等に用いることが好ましい。The steel additive of the present invention is preferably used in a processing method other than the injection method, for example, the KR method (Kambara reactor method) or the pouring method.
【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 more specifically with reference to examples and comparative examples.
【００１８】実施例１〜２９、比較例１〜２１ 合成カルシウムシアナミド（ＣａＣＮ2：９９％
（「％」は重量％、以下同じ。）粒度：３０ｍｍ下）、
酸化カルシウム（ＣａＯ：９９％、粒度：３０ｍｍ
下）、酸化マグネシウム（ＭｇＯ：９９％、粒度：３０
ｍｍ下）、酸化アルミニウム（電融アルミナ、Ａｌ
2Ｏ3：９９％、粒度：３０ｍｍ下）、酸化シリコン（白
珪石、ＳｉＯ2：９９％、粒度：３０ｍｍ下）、水酸化
カルシウム（Ｃａ（ＯＨ）2：９９％、粒度：３０ｍｍ
下）、炭酸カルシウム（ＣａＣＯ3：９９％、粒度：３
０ｍｍ下）、フッ化カルシウム（ＣａＦ2：９９％、粒
度：３０ｍｍ下）、金属シリコン（Ｓｉ：９９％、粒
度：３０ｍｍ下）、ＦｅＭｎ（Ｆｅ分１５％、Ｍｎ分８
０％、粒度：３０ｍｍ下）、黒鉛（Ｃ：９８％、粒度：
３０ｍｍ下）、カルシウムカーバイド（ＣａＣ2：８０
％、粒度：３０ｍｍ下）、蛍石（ＣａＦ2 ：９５％、粒
度：３０ｍｍ下）、ソーダ灰（Ｎａ2 ＣＯ3 ：９９％、
粒度：３０ｍｍ下）を表１、表２に示す割合で混合・粗
砕し分級して、種種の鉄鋼添加剤を製造した。得られた
鉄鋼添加剤の０．２ｍｍ下、０．２〜１．４ｍｍ、１．
４〜４ｍｍ、４〜２０ｍｍ、２０ｍｍ上の粒子の含有量
を手篩により測定し、表１、表２に示した。Examples 1-29, Comparative Examples 1-21 Synthetic calcium cyanamide (CaCNTwo: 99%
("%" Is% by weight, the same applies hereinafter.) Particle size: 30 mm below)
Calcium oxide (CaO: 99%, particle size: 30 mm
Bottom), magnesium oxide (MgO: 99%, particle size: 30)
mm below), aluminum oxide (fused alumina, Al
TwoOThree: 99%, particle size: under 30 mm), silicon oxide (white
Silica, SiOTwo: 99%, particle size: under 30 mm), hydroxylated
Calcium (Ca (OH)Two: 99%, particle size: 30mm
Bottom), calcium carbonate (CaCOThree: 99%, particle size: 3
0 mm below), calcium fluoride (CaFTwo: 99%, grain
Degree: 30mm below), metal silicon (Si: 99%, grain)
Degree: 30 mm below), FeMn (Fe content 15%, Mn content 8
0%, particle size: under 30 mm), graphite (C: 98%, particle size:
30mm below), calcium carbide (CaCTwo: 80
%, Particle size: under 30 mm), fluorite (CaFTwo : 95%, grain
Degree: 30 mm below), soda ash (NaTwoCOThree: 99%,
(Particle size: under 30 mm) in the proportions shown in Tables 1 and 2
Crushed and classified to produce various steel additives. Got
0.2 mm below the steel additive, 0.2-1.4 mm;
Content of particles on 4-4mm, 4-20mm, 20mm
Was measured with a hand sieve, and shown in Tables 1 and 2.
【００１９】合成カルシウムシアナミドは、ジシアンジ
アミド（（Ｈ2ＣＮ2）2：９８％）と炭酸カルシウム
（ＣａＣＯ3：９９％）を１：１で混合し、１１００℃
で１時間、窒素ガス雰囲気下で加熱合成し、３０ｍｍ下
に粗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%) and calcium carbonate (CaCO 3 : 99%) at a ratio of 1: 1 and 1100 ° C.
For 1 hour under a nitrogen gas atmosphere, and crushed to a depth of 30 mm.
【００２０】酸化マグネシウム、水酸化カルシウム、炭
酸カルシウム、フッ化カルシウム、ソーダ灰は、粉状の
市販品（純度：９９％）を圧縮成型し、３０ｍｍ下に粗
砕したものを使用した。Magnesium oxide, calcium hydroxide, calcium carbonate, calcium fluoride, and soda ash were obtained by compression-molding a powdery commercial product (purity: 99%) and crushing the powder to 30 mm or less.
【００２１】上記で得られた鉄鋼添加剤を、Ｎ2雰囲気
において、溶銑（温度１３００℃）１００重量部に対し
１．０重量部を添加し、１５分間十字インペラにより撹
拌して脱硫処理を行い、次式に従って脱硫率を測定し
た。それらの結果を表１、表２に示す。なお、試験前の
溶銑の硫黄濃度は、２００〜３００ｐｐｍであった。In the N 2 atmosphere, 1.0 parts by weight of the steel additive obtained above is added to 100 parts by weight of hot metal (temperature 1300 ° C.), and the mixture is stirred for 15 minutes with a cross impeller to perform desulfurization treatment. The desulfurization rate was measured according to the following equation. Tables 1 and 2 show the results. The sulfur concentration of the hot metal before the test was 200 to 300 ppm.
【００２２】脱硫率（％）＝（溶銑から除去された硫黄
の重量）×１００／（脱硫処理前の溶銑中の硫黄重量）Desulfurization rate (%) = (weight of sulfur removed from hot metal) × 100 / (weight of sulfur in hot metal before desulfurization treatment)
【００２３】また、炉材（耐火物）の溶損状態の評価と
して、Ｎ2 雰囲気において、溶銑（温度１４００℃）１
００重量部に対し２重量部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（Ａｌ2 Ｏ3 分８４％、
ＳｉＯ2 分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。それらの結果を表
１、表２に示す。Further, as an evaluation of the corrosion state of the furnace material (refractory), in N 2 atmosphere, the hot metal (temperature 1400 ° C.) 1
2 parts by weight of a steel additive were added to 00 parts by weight, and alumina-siliceous brick (Al 2 O 3 min. 84%,
(13% SiO 2 , size: normal type) was immersed for 1 hour, and the erosion depth (mm) of the cross section was measured. Tables 1 and 2 show the results.
【００２４】[0024]
【表１】 [Table 1]
【００２５】[0025]
【表２】 [Table 2]
【００２６】[0026]
【発明の効果】本発明によれば、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
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, there is provided a steel additive excellent in balance between high desulfurization performance, noncorrosiveness to furnace materials, and high safety during slag treatment. 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)
〜７０重量％、並びにＣａＯ、ＣａＣＮ2以外の無機質
物質５〜７０重量％を含み、０．２ｍｍ下の粒子が２０
重量％以下、２０ｍｍ上の粒子が１０重量％以下の粒状
物からなることを特徴とする鉄鋼添加剤。1. 10% to 90% by weight of CaO, CaCN 2 3
70 wt%, and CaO, comprises 5 to 70 wt% inorganic materials other than CaCN 2, under 0.2mm particles 20
A steel additive, characterized in that particles of up to 20% by weight and of particles above 20 mm consist of up to 10% by weight of particulate matter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17649699A JP3904345B2 (en) | 1999-06-23 | 1999-06-23 | Steel additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17649699A JP3904345B2 (en) | 1999-06-23 | 1999-06-23 | Steel additive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001003114A true JP2001003114A (en) | 2001-01-09 |
| JP3904345B2 JP3904345B2 (en) | 2007-04-11 |
Family
ID=16014684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17649699A Expired - Lifetime JP3904345B2 (en) | 1999-06-23 | 1999-06-23 | Steel additive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3904345B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100925152B1 (en) | 2008-03-24 | 2009-11-05 | 주식회사 알덱스 | Activator for slag of ladle in steel refining process |
| KR100929179B1 (en) * | 2002-12-20 | 2009-12-01 | 주식회사 포스코 | Method for promoting desulfurization of molten steel with CaO-CaN2 mixed composition |
| EP2309006A1 (en) * | 2009-09-21 | 2011-04-13 | Korea Institute of Industrial Technology | Desulfurizing agent and method for manufacturing the same |
| CN110204314A (en) * | 2019-06-03 | 2019-09-06 | 李朝侠 | Pouring material furnace lining and zinc leaching slag rotary kiln with the furnace lining |
| CN112609041A (en) * | 2021-01-07 | 2021-04-06 | 辽宁科技学院 | Preparation method of molten iron calcium-based desulfurization slag conglomeration agent |
-
1999
- 1999-06-23 JP JP17649699A patent/JP3904345B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100929179B1 (en) * | 2002-12-20 | 2009-12-01 | 주식회사 포스코 | Method for promoting desulfurization of molten steel with CaO-CaN2 mixed composition |
| KR100925152B1 (en) | 2008-03-24 | 2009-11-05 | 주식회사 알덱스 | Activator for slag of ladle in steel refining process |
| EP2309006A1 (en) * | 2009-09-21 | 2011-04-13 | Korea Institute of Industrial Technology | Desulfurizing agent and method for manufacturing the same |
| US8349050B2 (en) | 2009-09-21 | 2013-01-08 | Korea Institute Of Industrial Technology | Desulfurizing agent and method for manufacturing the same |
| US8668762B2 (en) | 2009-09-21 | 2014-03-11 | Korea Institute Of Industrial Technology | Method for manufacturing desulfurizing agent |
| CN110204314A (en) * | 2019-06-03 | 2019-09-06 | 李朝侠 | Pouring material furnace lining and zinc leaching slag rotary kiln with the furnace lining |
| CN110204314B (en) * | 2019-06-03 | 2020-08-04 | 李朝侠 | Pouring material furnace lining and zinc leaching deslagging rotary kiln with same |
| CN112609041A (en) * | 2021-01-07 | 2021-04-06 | 辽宁科技学院 | Preparation method of molten iron calcium-based desulfurization slag conglomeration agent |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3904345B2 (en) | 2007-04-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2118646C (en) | Process and additives for the ladle refining of steel | |
| GB2048308A (en) | Desulphurizing agent | |
| JP2001003114A (en) | Additive for steel refining | |
| JP3733689B2 (en) | Hot metal desulfurization method | |
| JPS60258406A (en) | Synthetic flux for molten steel | |
| JP3909993B2 (en) | Steel additive | |
| GB2039536A (en) | Desulphurising molten metals | |
| CA1060214A (en) | Method for desulfurizing molten iron | |
| JP3516579B2 (en) | Hot metal desulfurizing agent | |
| JPS58167711A (en) | Refining agent for steel melt | |
| RU2354707C2 (en) | Method of receiving for complex synthetic flux material for ferrous material | |
| JP4234118B2 (en) | Steel additive | |
| KR970004987B1 (en) | Slag making material | |
| PL183768B1 (en) | Desulphurising calcium carbide mixture | |
| KR840001170B1 (en) | Injection desulfurzizing agent | |
| JP2000109921A (en) | Additive for steel | |
| JP2000109916A (en) | Steel additive | |
| JP3722776B2 (en) | Steel additive | |
| JP2000109922A (en) | Additive for steel | |
| JP3769875B2 (en) | Desulfurization method and desulfurization agent for iron-based molten alloy | |
| JP2000109919A (en) | Steel additive | |
| JP2000109917A (en) | Steel additive | |
| JPH0617495B2 (en) | Dephosphorizing agent for hot metal | |
| JP2000109918A (en) | Steel additive | |
| JP2002285217A (en) | Dephosphorizing agent and desulfurizing agent for molten iron and molten steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20051102 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20061017 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20061031 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20061114 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20070109 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20070109 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 Ref document number: 3904345 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100119 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110119 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120119 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130119 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130119 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140119 Year of fee payment: 7 |
|
| EXPY | Cancellation because of completion of term |