JPH0639609B2 - Hot metal casting floor desulfurization method - Google Patents
Hot metal casting floor desulfurization methodInfo
- Publication number
- JPH0639609B2 JPH0639609B2 JP33127489A JP33127489A JPH0639609B2 JP H0639609 B2 JPH0639609 B2 JP H0639609B2 JP 33127489 A JP33127489 A JP 33127489A JP 33127489 A JP33127489 A JP 33127489A JP H0639609 B2 JPH0639609 B2 JP H0639609B2
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- slag
- desulfurization
- sio
- 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.)
- Expired - Lifetime
Links
- 238000006477 desulfuration reaction Methods 0.000 title claims description 36
- 230000023556 desulfurization Effects 0.000 title claims description 36
- 238000000034 method Methods 0.000 title claims description 10
- 238000005058 metal casting Methods 0.000 title claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 28
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 230000003009 desulfurizing effect Effects 0.000 claims description 22
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 14
- 239000010881 fly ash Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 8
- 229910001882 dioxygen Inorganic materials 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 3
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000002893 slag Substances 0.000 description 39
- 238000006243 chemical reaction Methods 0.000 description 13
- 230000007423 decrease Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、高炉等の冶金炉の鋳床における溶銑の脱硫方
法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for desulfurizing hot metal in a casting floor of a metallurgical furnace such as a blast furnace.
＜従来の技術＞ 一般に、CaO／SiO2＝1.15〜1.25、（CaO＋MgO）／（SiO
2＋Al2O3）＝0.95〜1.05、Al2O315％前後の高炉スラ
グには、脱硫能があり、高炉内溶銑の脱硫率は90〜95％
であることが知られている｛日本鉄鋼協会編、鉄鋼便覧
II、ｐ272〜ｐ274、丸善（1980）｝。高炉スラグの組成
をCaO−SiO2−Al2O3の３元系状態図上に示すと第２図の
ようになる。<Prior Art> Generally, CaO / SiO 2 = 1.15 to 1.25, (CaO + MgO) / (SiO
2 + Al 2 O 3 ) = 0.95 to 1.05, Al 2 O 3 15% blast furnace slag has desulfurization ability, and the desulfurization rate of hot metal in the blast furnace is 90 to 95%
It is known that {The Iron and Steel Handbook edited by Japan Iron and Steel Institute
II, p272-p274, Maruzen (1980)}. When The composition of blast furnace slag in the ternary phase diagram of CaO-SiO 2 -Al 2 O 3 is shown in Figure 2.
しかしながら、このような組成の脱硫剤を製造するには
脱硫反応に直接寄与する石灰粉にスラグの流動性、密度
調整のためSiO2源（珪石粉など）とAl2O3源を混合する
必要があるが、SiO2源、Al2O3源は高価であり、脱硫コ
ストが高いという問題点があった。However, in order to produce a desulfurizing agent having such a composition, it is necessary to mix a SiO 2 source (such as silica powder) and an Al 2 O 3 source with lime powder that directly contributes to the desulfurization reaction in order to adjust the fluidity and density of the slag. However, there is a problem that the SiO 2 source and the Al 2 O 3 source are expensive and the desulfurization cost is high.
また、脱硫反応に直接寄与しないSiO2、Al2O3が入って
いるために、その分の顕熱により溶銑温度低下幅がCaO
主体の脱硫剤よりも大きかった。In addition, since SiO 2 and Al 2 O 3 that do not directly contribute to the desulfurization reaction are contained, the sensible heat of that amount causes CaO to decrease in the hot metal temperature range.
It was larger than the main desulfurizing agent.
さらに、高炉鋳床の溶銑樋で脱硫処理する場合、脱硫ス
ラグを溶銑と共にトピードカー中に入れると、受銑量の
低下、トピードカーの汚染などの問題が生ずるために、
事前に溶銑と脱硫スラグを分離する必要がある。しかし
ながらこのような組成の脱硫スラグは融点が高く（14
00℃）、溶銑温度も低下していて、高炉スラグほどの量
がないために、大気にさらされている脱硫スラグ表面
や、溶銑と分離した後の脱硫スラグは直ちに固化してし
まい、うまく除滓することができないという問題点もあ
った。Furthermore, in the case of desulfurization treatment with hot metal gutter of blast furnace cast floor, if desulfurization slag is put in the toeped car together with the hot metal, problems such as decrease in the amount of pig iron received and contamination of the toeped car occur,
It is necessary to separate hot metal and desulfurized slag in advance. However, the desulfurization slag having such a composition has a high melting point (14
(00 ° C), the hot metal temperature has dropped, and since the amount of hot metal is not the same as that of blast furnace slag, the surface of desulfurized slag exposed to the atmosphere and the desulfurized slag after separation from the hot metal solidify immediately and are removed successfully. There was also the problem that it was not possible to slag.
一方、高炉スラグに近い組成物を精錬関係に使用する発
明としては特公昭５７−４５９９８号公報に開示された
技術があるが、これは高炉スラグを軟化する目的でスラ
グ融点の低い組成範囲を示したものであり、本発明に係
る脱硫剤として用いる技術とは基本的に異なる技術であ
る。On the other hand, there is a technique disclosed in Japanese Patent Publication No. 57-45998 as an invention that uses a composition similar to blast furnace slag for refining, but this shows a composition range of low slag melting point for the purpose of softening blast furnace slag. The technique is basically different from the technique used as the desulfurizing agent according to the present invention.
＜発明が解決しようとする課題＞ 従来の高炉スラグ系の脱硫剤を高炉鋳床の溶銑樋で用い
ると、溶銑温度の低下、脱硫スラグの固化のため自然排
滓ができないという問題があったので、本発明はその問
題を解決した高炉鋳床での脱硫技術を提供するためにな
されたものである。<Problems to be Solved by the Invention> When a conventional blast furnace slag-based desulfurizing agent is used in the hot metal gutter of a blast furnace casting floor, there is a problem that natural slag cannot be discharged due to a decrease in the hot metal temperature and solidification of the desulfurized slag. The present invention has been made to provide a desulfurization technique for a blast furnace casting floor that solves the problem.
＜課題を解決するための手段＞ 本発明は、CaO−SiO2−Al2O3 ３元系に換算したとき
に重量比で、CaO 40〜57％、SiO2 30％以上、Al2O3
100−（CaO＋SiO2）％、である組成物と、該組成物100
％に対しＣが５〜20％と、不可避的不純物と、からなる
脱硫剤を用い、かつ脱硫剤投入位置から１ｍ以上離れた
下流位置で酸素ガスを吹き付けることを特徴とする溶銑
の鋳床脱硫方法で、かつ脱硫剤がフライアッシュと石
灰粉との混合物であることを特徴とする前項記載の溶
銑の鋳床脱硫方法である。<SUMMARY for the> present invention, a weight ratio when converted into CaO-SiO 2 -Al 2 O 3 3 ternary, CaO 40~57%, SiO 2 30 % or more, Al 2 O 3
100- (CaO + SiO 2)% , and the composition is, the composition 100
% Of C to 5% to 20% of unavoidable impurities, and a desulfurizing agent for hot metal casting characterized by spraying oxygen gas at a downstream position 1 m or more away from the position where the desulfurizing agent is introduced. The method of desulfurization of cast iron for hot metal according to the preceding paragraph, characterized in that the desulfurizing agent is a mixture of fly ash and lime powder.
＜作 用＞ 溶銑温度低下の問題及び脱硫スラグの融点が高く、自然
排滓できない問題の解決方法について示す。<Operation> This section describes how to solve the problems of lowering the hot metal temperature and the problem that desulfurization slag has a high melting point and cannot be discharged naturally.
本発明者らは、スラグ中にＣを混入させ、これを脱硫剤
として有効に活用することを考えた。すなわち、本発明
によれば、前記脱硫剤の投入位置から１ｍ以上離れた下
流の位置に酸素ガスを吹き付けることによって、脱硫ス
ラグ中のＣが２次燃焼して、この燃焼熱が溶銑及び脱硫
スラグに着熱し、溶銑温度を上昇させるとともに、脱硫
スラグの温度も上昇させて、脱硫スラグの流動性を向上
させることができる。The present inventors considered mixing C into slag and effectively utilizing it as a desulfurizing agent. That is, according to the present invention, C in the desulfurization slag is secondarily combusted by blowing oxygen gas to a downstream position 1 m or more away from the position where the desulfurization agent is introduced, and this heat of combustion causes the heat of combustion to generate hot metal and desulfurization slag. It is possible to improve the fluidity of the desulfurization slag by raising the temperature of the hot metal and raising the temperature of the desulfurization slag as well.
酸素ガスを吹き付ける位置を脱硫剤投入位置から１ｍ以
上離す理由は、脱硫反応が還元反応であり、反応界面で
の酸素濃度が低い方が反応が促進され、主な反応サイト
である脱硫剤投入位置から１ｍ以内で酸素ガスを吹き付
けると脱硫反応が阻害されるからである。The reason why the position where the oxygen gas is blown is 1 m or more away from the desulfurization agent charging position is that the desulfurization reaction is a reduction reaction, and the reaction is promoted when the oxygen concentration at the reaction interface is lower, and the desulfurization agent charging position is the main reaction site. This is because if the oxygen gas is blown within 1 m from the above, the desulfurization reaction is hindered.
脱硫剤の組成を数値限定した理由を説明する。The reason why the composition of the desulfurizing agent is numerically limited will be described.
脱硫剤をCaO−SiO2−Al2O3３元系に換算した時のCaOが4
0％以下であると、脱硫能が低下するとともに、同一のC
aO（脱硫主剤）原単位下では相対的に副剤（SiO2、Al2O
3）の含有量が増し、溶銑温度低下を防ぐことができな
くなり、一方、57％を超えると脱硫スラグの活動性が悪
化し、自然排滓ができなくなるとともに、流動性の悪化
に伴い、溶銑とその上に浮上しているスラグ間のパーマ
ネントコンタクト反応が阻害され脱硫率も低下するから
である。CaO when converting the desulfurizing agent to the CaO-SiO 2 -Al 2 O 3 3 -way system 4
When it is 0% or less, the desulfurization ability decreases and the same C
Under the basic unit of aO (desulfurization main agent), auxiliary agents (SiO 2 , Al 2 O
The content of 3 ) increases, and it becomes impossible to prevent the drop in hot metal temperature. On the other hand, when it exceeds 57%, the activity of desulfurization slag deteriorates, natural slag cannot be formed, and as the flowability deteriorates, This is because the permanent contact reaction between the slag and the slag floating above it is hindered and the desulfurization rate also decreases.
SiO2が30％以下であると、スラグの流動性が悪化し、自
然排滓ができなくなるため、30％以上と限定した。If the SiO 2 content is 30% or less, the fluidity of the slag deteriorates and natural slag cannot be produced. Therefore, the content was limited to 30% or more.
Ｃが５％以下であると、スラグの昇温効果が十分でな
く、また20％以上では昇温効果が飽和してくるので、５
〜20％とした。If C is 5% or less, the temperature raising effect of the slag is not sufficient, and if it is 20% or more, the temperature raising effect becomes saturated.
~ 20%.
フライアッシュは石炭火力発電時に出る灰である。電気
集塵機等で捕集されたものは平均粒子径10〜50μｍと細
かく、脱硫剤として用いる際には粉砕の必要がない。成
分はSiO240〜75％、Al2O310〜40％、CaO０〜20％、Fe2O
3１〜５％、Ｃ10〜30％であり、石炭種によって大きく
異なる。またＣの含有率は燃焼方法によって異なり、低
酸素燃焼によってＣ含有率は高くなる。Fly ash is ash produced during coal-fired power generation. The particles collected by an electric dust collector or the like are fine with an average particle size of 10 to 50 μm and do not need to be pulverized when used as a desulfurizing agent. The components are SiO 2 40-75%, Al 2 O 3 10-40%, CaO 0-20%, Fe 2 O
31 to 5% and C10 to 30%, which vary greatly depending on the coal type. Further, the C content varies depending on the combustion method, and the low oxygen combustion increases the C content.
フライアッシュを脱硫剤として用いるのは、フライアッ
シュはSiO2／Al2O3≒１〜３であり、高炉スラグのSiO2
／Al2O3≒2.6を内包し、複数の石炭種のフライアッシュ
を混合すれば目標に合うSiO2／Al2O3を得ることがで
き、これにCaO源として石灰粉を混合すれば、請求範囲
を示した組成の脱硫剤を得ることができるためである。The fly ash is used as a desulfurizing agent because the fly ash is SiO 2 / Al 2 O 3 ≈1 to 3 and the SiO 2 of the blast furnace slag is
/ Al 2 O 3 ≈2.6 is included, and by mixing fly ash of multiple coal species, it is possible to obtain SiO 2 / Al 2 O 3 that meets the target. If this is mixed with lime powder as a CaO source, This is because it is possible to obtain a desulfurizing agent having the composition shown in the claims.
このようにして、高価なSiO2源、Al2O3源を現在有効利
用がなされていない安価なフライアッシュによってまか
なえば脱硫処理コストは大幅に低減することができる。In this way, if the expensive SiO 2 source and Al 2 O 3 source are covered by inexpensive fly ash that has not been effectively used at present, the desulfurization treatment cost can be significantly reduced.
第１表に石灰粉、珪石粉、アルミナ粉、カーボンを混合
して製造した脱硫剤単価とフライアッシュと石灰粉を混
合して製造した脱硫剤単価の比較表を示すが、フライア
ッシュ利用の脱硫剤が明らかに安価である。Table 1 shows a comparison table of the desulfurization agent unit price produced by mixing lime powder, silica stone powder, alumina powder, and carbon and the desulfurization agent unit price produced by mixing fly ash and lime powder. Desulfurization using fly ash The agent is obviously cheap.
次に特許の請求範囲に記載の数値限定の根拠となる試験
例を示す。 Next, a test example which is the basis of the numerical limitation described in the claims of the patent will be shown.
第３図には酸素ガス吹き付け位置と脱硫剤投入位置間の
距離とΔＳ（％）の関係を示した。１ｍよりも距離が小
さいと反応界面での酸素濃度が上昇するために脱硫反応
が阻害され、ΔＳは小さくなっている。このため酸素吹
き付け位置は脱硫剤投入位置から１ｍ以上離した方がよ
い。FIG. 3 shows the relationship between the distance between the oxygen gas blowing position and the desulfurizing agent charging position and ΔS (%). When the distance is smaller than 1 m, the oxygen concentration at the reaction interface rises, so that the desulfurization reaction is hindered and ΔS becomes small. For this reason, it is preferable that the oxygen blowing position is separated from the desulfurizing agent charging position by 1 m or more.
第４図、第５図にはAl2O3／SiO2＝0.1、0.33で、CaO−A
l2O3−SiO2３元系に換算した時のCaO濃度を変化させた
時の試験例を示す。後工程を考慮するとΔＳ≧0.02％が
必要であるから、これを満足するには、それぞれCaO＝4
3〜57、40〜54％が好適範囲となる。Al2O3／SiO2の値に
よって多少異なるが、CaO＝40〜57％であれば良好な脱
硫反応が得られる。In Figures 4 and 5, Al 2 O 3 / SiO 2 = 0.1, 0.33, CaO-A
test examples are shown when changing the CaO concentration when converted to l 2 O 3 -SiO 2 3-way system. Considering the post process, ΔS ≧ 0.02% is required, so to satisfy this, CaO = 4
The preferable range is 3 to 57% and 40 to 54%. A good desulfurization reaction can be obtained if CaO = 40 to 57%, although it varies somewhat depending on the value of Al 2 O 3 / SiO 2 .
また、第２図に示したように、CaO≧57％、あるいはSiO
2≦30％ではスラグの融点が上昇し、スラグ流動性の悪
化が起こり、スラグの自然排滓が困難となる。また、流
動性が悪化するとスラグと溶銑間のパーマネントコンタ
クト反応も阻害される結果となり脱硫反応も阻害され
る。Also, as shown in FIG. 2, CaO ≧ 57%, or SiO
When 2 ≤ 30%, the melting point of slag rises, the fluidity of slag deteriorates, and it becomes difficult to remove slag naturally. Further, when the fluidity is deteriorated, the permanent contact reaction between the slag and the hot metal is also hindered, and the desulfurization reaction is also hindered.
＜実施例＞ 第１図は本発明の一実施例を示す。第１図は溶銑温度低
下ΔＨＭＴ（＝処理前溶銑温度−処理後溶銑温度）及び
溶銑中Ｓ濃度低下（＝処理前Ｓ濃度−処理後Ｓ濃度）と
脱硫剤のCaO原単位（kg−CaO／ｔ−ｐ）との関係を示し
た特性図である。また比較例もともにこの特性図に示し
た。この時の実験条件を第２表に示した。<Example> FIG. 1 shows an example of the present invention. Fig. 1 shows a decrease in hot metal temperature ΔHMT (= hot metal temperature before treatment-hot metal temperature after treatment) and a decrease in S concentration in hot metal (= S concentration before treatment-S concentration after treatment) and the desulfurizing agent CaO unit (kg-CaO / It is a characteristic view showing the relationship with tp). A comparative example is also shown in this characteristic diagram. The experimental conditions at this time are shown in Table 2.
第１図に示したように本発明ではスラグ中のＣを酸素ガ
スによって燃焼させたので、その燃焼熱によって溶銑温
度の低下（ΔＨＭＴ）は小さくなった。またスラグの温
度上昇によりスラグ流動性が良くなり、スラグ中のＣに
よる脱酸効果によって脱硫量も大きくなった。また、本
発明では自然排滓ができたが、比較例では自然排滓はで
きなかった。As shown in FIG. 1, in the present invention, since C in the slag was burned by oxygen gas, the decrease in the hot metal temperature (ΔHMT) was reduced by the heat of combustion. Further, the fluidity of the slag was improved by the temperature rise of the slag, and the desulfurization amount was also increased by the deoxidizing effect of C in the slag. Further, in the present invention, natural waste was produced, but in the comparative example, natural waste was not produced.
＜発明の効果＞ 本発明は、脱硫剤中にＣを混合させ、酸素吹きによって
このＣを燃焼させて昇温を行ったために、 溶銑温度低下の防止、 自然排滓が可能となる、 という効果がある。また脱硫剤組成物に安価なフライア
ッシュを用いれば、 脱硫コストの低減、 という効果がある。 <Effects of the Invention> Since the present invention mixes C in a desulfurizing agent and burns this C by blowing oxygen to raise the temperature, it is possible to prevent lowering of the hot metal temperature and natural slag. There is. Further, if inexpensive fly ash is used in the desulfurization agent composition, the desulfurization cost can be reduced.
第１図は、本発明と比較例とのCaO原単位とΔＳ、ΔＨ
ＭＴとの関係を示した特性図、第２図は、本発明に係る
３元系組成をCaO−SiO2−Al2O3の３元系状態図上に示し
た図、第３図は、酸素ガス吹き付け位置の好適範囲を示
した特性図、第４図、第５図は、脱硫剤中CaO濃度の好
適範囲を示した特性図である。FIG. 1 shows the basic unit of CaO and ΔS, ΔH of the present invention and the comparative example.
FIG. 2 is a characteristic diagram showing the relationship with MT, FIG. 2 is a diagram showing the ternary composition according to the present invention on the ternary phase diagram of CaO—SiO 2 —Al 2 O 3 , and FIG. 3 is FIG. 4 is a characteristic diagram showing a preferable range of the oxygen gas spraying position, and FIGS. 4 and 5 are characteristic diagrams showing a preferable range of the CaO concentration in the desulfurizing agent.
Claims (2)
に重量比で、 CaO 40〜57％、 SiO2 30％以上、 Al2O3 100−（CaO＋SiO2）％、 である組成物と、該組成物100％に対しＣが５〜20％
と、不可避的不純物と、からなる脱硫剤を用い、かつ脱
硫剤投入位置から１ｍ以上離れた下流位置で酸素ガスを
吹き付けることを特徴とする溶銑の鋳床脱硫方法。In claim 1 the weight ratio when converted to CaO-SiO 2 -Al 2 O 3 3 ternary, CaO 40~57%, SiO 2 30 % or more, Al 2 O 3 100- (CaO + SiO 2)%, And a C content of 5 to 20% relative to 100% of the composition
And a unavoidable impurity, and a method of desulfurizing a hot metal casting floor, which comprises spraying oxygen gas at a downstream position 1 m or more away from the position where the desulfurizing agent is introduced.
物であることを特徴とする請求項１記載の溶銑の鋳床脱
硫方法。2. The method of desulfurization of cast iron for hot metal according to claim 1, wherein the desulfurizing agent is a mixture of fly ash and lime powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33127489A JPH0639609B2 (en) | 1989-12-22 | 1989-12-22 | Hot metal casting floor desulfurization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33127489A JPH0639609B2 (en) | 1989-12-22 | 1989-12-22 | Hot metal casting floor desulfurization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03193811A JPH03193811A (en) | 1991-08-23 |
| JPH0639609B2 true JPH0639609B2 (en) | 1994-05-25 |
Family
ID=18241859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33127489A Expired - Lifetime JPH0639609B2 (en) | 1989-12-22 | 1989-12-22 | Hot metal casting floor desulfurization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0639609B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5074063B2 (en) * | 2007-03-20 | 2012-11-14 | Ｊｆｅスチール株式会社 | Desulfurization agent and method for desulfurization of molten iron |
| JP5074064B2 (en) * | 2007-03-20 | 2012-11-14 | Ｊｆｅミネラル株式会社 | Method for producing desulfurizing agent |
| JP5341235B2 (en) * | 2012-06-15 | 2013-11-13 | Ｊｆｅスチール株式会社 | Desulfurization agent and method for desulfurization of molten iron |
| CN114904377A (en) * | 2022-04-07 | 2022-08-16 | 珠海市胜彥节能环保科技有限公司 | Desulfurizing agent and preparation method and application thereof |
-
1989
- 1989-12-22 JP JP33127489A patent/JPH0639609B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03193811A (en) | 1991-08-23 |
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