JPH0617496B2 - Method for dephosphorizing hot metal - Google Patents
Method for dephosphorizing hot metalInfo
- Publication number
- JPH0617496B2 JPH0617496B2 JP61198220A JP19822086A JPH0617496B2 JP H0617496 B2 JPH0617496 B2 JP H0617496B2 JP 61198220 A JP61198220 A JP 61198220A JP 19822086 A JP19822086 A JP 19822086A JP H0617496 B2 JPH0617496 B2 JP H0617496B2
- Authority
- JP
- Japan
- Prior art keywords
- cao
- caf
- dephosphorization
- hot metal
- ratio
- 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
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- 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＞ この発明は溶銑の脱燐剤と脱燐方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a dephosphorizing agent for hot metal and a dephosphorizing method.
＜従来の技術＞ 溶銑の脱燐剤としては生石灰を含んだフラックスが広く
用いられているが、これらのフラックス中には低温でも
生石灰が容易に滓化するようにCaF2が一般に添加されて
いる。しかしながら、CaF2は耐火物の溶損を助長するば
かりでなく、スラグ処理上大きな問題を有しているた
め、他の滓化剤の使用が望まれている。これを解決する
ために、たとえば特願昭61−47383号明細書に見られる
ようなCaF2の代わりにAl2O3を用いる方法が提案されて
いる。<Prior Art> Fluxes containing quick lime are widely used as a dephosphorizing agent for hot metal, and CaF 2 is generally added to these fluxes so that quick lime easily slags even at low temperatures. . However, CaF 2 not only promotes melting loss of refractory materials but also has a great problem in slag treatment, and therefore, the use of other slag forming agents is desired. In order to solve this, for example, a method of using Al 2 O 3 instead of CaF 2 as disclosed in Japanese Patent Application No. 61-47383 has been proposed.
＜発明が解決しようとする問題点＞ しかしながら、特願昭61−47383号明細書で示される例
は、脱燐能は在来のものと同等のレベルしかない上、脱
燐と同時に進行する脱硫反応の脱硫率が低く、したがっ
て脱燐前後に使用する脱硫フラックスの原単位の増加を
もたらし、コスト高になる。本発明は、これらの問題点
の解消を目的としている。<Problems to be Solved by the Invention> However, in the example shown in Japanese Patent Application No. 61-47383, the dephosphorization ability is at a level equivalent to that of the conventional one, and desulfurization proceeds simultaneously with dephosphorization. The desulfurization rate of the reaction is low, resulting in an increase in the basic unit of desulfurization flux used before and after dephosphorization, resulting in high cost. The present invention aims to solve these problems.
＜問題点を解決するための手段＞ 本発明は、上記したように従来技術の問題点を解決する
ため、構成成分がCaO，Al2O3，CaF2及び固体酸素源及び
／もしくは気体酸素源と不可避的に混入する不純物から
なり、CaOの重量と前記酸素源中の酸素の重量比CaO／Ｏ
が１．０〜２．５、Al2O3とCaF2の総量とCaOの重量比(A
l2O3+CaF2)/CaOが０．１〜１．０であり、かつAl2O3とC
aF2の重量比Al2O3／CaF2が０．０５〜２０．０である脱
燐剤を溶銑に添加することを特徴とする溶銑の脱燐方法
を要旨とするものである。<Means for Solving Problems> In order to solve the problems of the prior art as described above, the present invention has components of CaO, Al 2 O 3 , CaF 2 and a solid oxygen source and / or a gaseous oxygen source. And inevitably mixed impurities, and the weight ratio of CaO to the oxygen in the oxygen source is CaO / O.
Is 1.0 to 2.5, the total amount of Al 2 O 3 and CaF 2 and the weight ratio of CaO (A
l 2 O 3 + CaF 2 ) / CaO is 0.1 to 1.0, and Al 2 O 3 and C
The gist is a method for dephosphorizing hot metal, which is characterized in that a dephosphorizing agent having an aF 2 weight ratio Al 2 O 3 / CaF 2 of 0.05 to 20.0 is added to the hot metal.
＜作 用＞ 本発明の手段がもたらす具体的な作用を以下に詳述す
る。<Operation> The specific action of the means of the present invention will be described in detail below.
本発明者らは、上記した各々の問題を解消しうる溶銑の
脱燐剤について検討を重ね、その結果、溶銑の脱燐を行
うに際して生石灰の滓化剤としてCaF2とAl2O3を混合添
加したCaO−CaF2−Al2O3−固体酸素系を主成分とする脱
燐剤において各成分の濃度を種々変化させると脱燐効率
が変化し、CaO重量と固体酸素中の酸素の重量比CaO／Ｏ
を１．０〜２．５、Al2O3とCaF2の総量とCaOの重量比(A
l2O3+CaF2)/CaOを０．１〜１．０、さらにAl2O3とCaF2
の重量比Al2O3／CaF2を０．０５〜２０．０にすると脱
燐効率が最大となり、その結果高い脱燐率が得られるこ
とを見いだした。The present inventors have repeatedly studied hot metal dephosphorization agents that can solve the above-mentioned problems, and as a result, when performing hot metal dephosphorization, CaF 2 and Al 2 O 3 are mixed as a slagging agent for quicklime. the added CaO-CaF 2 -Al 2 O 3 - solid oxygen system dephosphorization efficiency is changed variously changed the concentration of each component in the dephosphorization agent composed mainly of the weight of oxygen CaO by weight and the solid oxygen Ratio CaO / O
1.0 to 2.5, the total amount of Al 2 O 3 and CaF 2 and the weight ratio of CaO (A
l 2 O 3 + CaF 2 ) / CaO 0.1 to 1.0, Al 2 O 3 and CaF 2
It was found that when the weight ratio of Al 2 O 3 / CaF 2 is 0.05 to 20.0, the dephosphorization efficiency is maximized, and as a result, a high dephosphorization rate is obtained.
それらの関係を、第１図〜第３図に示す。The relationships between them are shown in FIGS.
第１図はCaO−CaF2−Al2O3−固体酸素系脱燐剤中の(CaF
2+Al2O3)／CaOを０．３に固定し、CaO／Ｏ比を変化させ
たときの脱燐率の変化を示している。CaO／Ｏ比は低す
ぎるとCaO供給不足になり、高すぎると酸素供給不足と
なり、適正なCaO／Ｏ比が存在するが、脱燐率８０％以
上を得るCaO／Ｏ比は図から明らかなように１．０〜
２．５である。Figure 1 shows CaO-CaF 2 -Al 2 O 3- (CaF
2 shows the change in the dephosphorization rate when the CaO / O ratio was changed while fixing 2 + Al 2 O 3 ) / CaO to 0.3. If the CaO / O ratio is too low, the CaO supply becomes insufficient, and if it is too high, the oxygen supply becomes insufficient, and there is a proper CaO / O ratio, but the CaO / O ratio at which the dephosphorization rate is 80% or more is clear from the figure. Like 1.0 ~
It is 2.5.
第２図はCaO−CaF2−Al2O3−固体酸素系脱燐剤中のCaO
／Ｏ比を２．０に固定して(CaF2+Al2O3)／CaOを変化さ
せたときの脱燐率の変化を示している。(CaF2+Al2O3)／
CaOが低すぎるとCaOの滓化不良が起こり、高すぎるとCa
O供給不足が起こるため、適正な(CaF2+Al2O3)／CaOが存
在するが、脱燐率８０％以上を得るためには、この比を
０．１〜１．０にする必要がある。Figure 2 is CaO-CaF 2 -Al 2 O 3 - Solid oxygen-based CaO in dephosphorization agent
4 shows changes in the dephosphorization rate when the / O ratio was fixed at 2.0 and (CaF 2 + Al 2 O 3 ) / CaO was changed. (CaF 2 + Al 2 O 3 ) /
If the content of CaO is too low, the slag formation of CaO will occur.
Since there is a shortage of O supply, proper (CaF 2 + Al 2 O 3 ) / CaO exists, but in order to obtain a dephosphorization rate of 80% or more, this ratio must be 0.1-1.0. There is.
第３図はCaO−CaF2−Al2O3−固体酸素系脱燐剤中のCaO/
Oの比を２．０に固定し、さらに(CaF2+Al2O3)／CaOを
０．３に固定して、Al2O3とCaF2の比率を変化させたと
きの脱燐率および脱硫率の変化を示している。Al2O3とC
aF2を混合した場合は、Al2O3単味あるいはCaF2単味の場
合よりも高い脱燐率が得られ、Al2O3／CaF2比が０．０
５〜２０．０の範囲では８０％以上の脱燐率が得られ
る、一方脱硫率はCaF2の配合割合を増加する程改善され
る。Figure 3 shows CaO / CaF 2 -Al 2 O 3 -CaO / in solid oxygen-based dephosphorization agent.
Dephosphorization rate when the ratio of O was fixed at 2.0 and (CaF 2 + Al 2 O 3 ) / CaO was fixed at 0.3, and the ratio of Al 2 O 3 and CaF 2 was changed. And the change in the desulfurization rate. Al 2 O 3 and C
When aF 2 is mixed, a higher dephosphorization rate is obtained than when Al 2 O 3 alone or CaF 2 alone is used, and the Al 2 O 3 / CaF 2 ratio is 0.0
In the range of 5 to 20.0, a dephosphorization rate of 80% or more can be obtained, while the desulfurization rate improves as the CaF 2 compounding ratio increases.
さらに本発明者らは、上記した適正組成範囲の脱燐剤に
含まれる酸化鉄中の酸素源の一部あるいは全部を気体酸
素に代替して脱燐率への影響を調べた結果、第４図に示
すように、酸化鉄の気体酸素への代替率、つまり気酸比
率を変化させても脱燐率に大きな差は認められず、いず
れも８０％以上の脱燐率が得られた。したがって、溶銑
温度が高い場合は固体酸素源を使うことにより鉄歩留の
増加が可能となり、溶銑温度が低い場合はその温度に応
じて気体酸素を使って昇温することにより後工程の温度
保証が可能となる。Further, the inventors of the present invention investigated the effect on the dephosphorization rate by substituting gaseous oxygen for a part or all of the oxygen source in iron oxide contained in the dephosphorizing agent having the above-mentioned proper composition range. As shown in the figure, no significant difference was observed in the dephosphorization rate even when the substitution ratio of iron oxide to gaseous oxygen, that is, the vapor acid ratio was changed, and in all cases, the dephosphorization rate of 80% or more was obtained. Therefore, when the hot metal temperature is high, it is possible to increase the iron yield by using a solid oxygen source, and when the hot metal temperature is low, the temperature is guaranteed in the post-process by raising the temperature using gaseous oxygen according to the temperature. Is possible.
本発明による脱燐処理と連続して本発明外の処理剤を用
いて脱硫処理を行う場合、該脱硫処理は脱燐処理と同時
あるいは前後のいずれで実施してもかまわない。When the desulfurization treatment is carried out continuously with the treating agent other than the present invention, the desulfurization treatment may be carried out simultaneously with or before or after the dephosphorization treatment.
＜実施例＞ 本発明例を以下に比較例と共に述べる。<Example> An example of the present invention will be described below together with a comparative example.
・溶銑成分 第１表に示す２種の溶銑成分を対象に脱燐試験を行なっ
た。-Hot Metal Components A dephosphorization test was conducted on the two hot metal components shown in Table 1.
・使用脱燐剤 第２表に示す７種類の処理剤を用いて脱燐試験を行っ
た。Dephosphorization agent used A dephosphorization test was conducted using the seven types of treatment agents shown in Table 2.
処理条件と試験結果を第３表に示す。Table 3 shows the treatment conditions and the test results.
溶銑Ａの脱燐処理において、CaO／Ｏを１．０〜２．
５、(CaF2+Al2O3)／CaOを０．１〜１．０かつAl2O3／Ca
F2を０．０５〜２０．０になるように脱燐剤組成を調整
した本発明例No.１，３，５，では、脱燐剤原単位４３k
g／Ｔ−Pig.で脱燐率８０％以上が安定して得られた。
また、脱燐剤組成を上記の適正組成に調整し、酸化鉄中
の酸素分の全部を気体酸素に置き換えた本発明例No.２
および酸化鉄中の酸素分の一部を気体酸素に置き換えた
本発明例No.４でも同一原単位で８０％以上の脱燐率が
得られた。一方、滓化剤としてAl2O3のみを添加した比
較例No.8およびCaF2のみを添加した比較例No.９では、
同一原単位で脱燐率が８０％に達しなかった。 In the dephosphorization treatment of the hot metal A, CaO / O is added to 1.0 to 2.
5, (CaF 2 + Al 2 O 3 ) / CaO 0.1-1.0 and Al 2 O 3 / Ca
In Example Nos. 1, 3, and 5 of the present invention in which the composition of the dephosphorizing agent was adjusted so that F 2 was 0.05 to 20.0, the dephosphorizing agent basic unit 43k
With g / T-Pig., a dephosphorization rate of 80% or more was stably obtained.
Further, the composition of the dephosphorizing agent was adjusted to the above-mentioned appropriate composition, and the whole oxygen content in the iron oxide was replaced with gaseous oxygen.
Also, in Example No. 4 of the present invention in which part of the oxygen content in iron oxide was replaced with gaseous oxygen, a dephosphorization rate of 80% or more was obtained with the same basic unit. On the other hand, in Comparative Example No. 8 in which only Al 2 O 3 was added as a slagging agent and Comparative Example No. 9 in which only CaF 2 was added,
The dephosphorization rate did not reach 80% with the same basic unit.
溶銑Ｂの脱燐処理において、CaO／Ｏを１．０〜２．
５、(CaF2+Al2O3)／CaOを０．１〜１．０かつAl2O3／Ca
F2を０．０５〜２０．０になるように脱燐剤組成を調整
した本発明例No.６およびNo.７では、脱燐剤原単位８０
kg／Ｔ−Pig.で脱燐率８０％以上が安定して得られた。
一方、滓化剤としてAl2O3のみを添加した比較例No.１０
では、同一原単位で脱燐率が８０％に達しなかった。In the dephosphorization treatment of the hot metal B, CaO / O was added in the range of 1.0 to 2.
5, (CaF 2 + Al 2 O 3 ) / CaO 0.1-1.0 and Al 2 O 3 / Ca
In the present invention examples No. 6 and No. 7 in which the composition of the dephosphorizing agent was adjusted so that F 2 was 0.05 to 20.0, the dephosphorizing agent basic unit 80
A dephosphorization rate of 80% or more was stably obtained at kg / T-Pig.
On the other hand, Comparative Example No. 10 in which only Al 2 O 3 was added as a slagging agent
, The dephosphorization rate did not reach 80% with the same basic unit.
以上示した実施例では、固体酸素源として酸化鉄を使用
したが、酸化鉄以外の固体酸素源、例えばマンガン酸化
物等も酸化鉄と同様に使用出来、この際は一般的に知ら
れているようにMn回収の相乗効果がえられる。In the examples shown above, iron oxide was used as the solid oxygen source, but solid oxygen sources other than iron oxide, such as manganese oxide, can be used in the same manner as iron oxide, and at this time, it is generally known. Thus, the synergistic effect of Mn recovery can be obtained.
＜発明の効果＞ 本発明はCaOの滓化剤としてCaF2とAl2O3を適宜混合して
使用することにより脱燐効果の向上をもたらし、それに
より脱燐剤の原単位の大幅減少を可能にするばかりでな
く、それに伴う処理時間の減少から円滑な操業がもたら
されると共に、同時脱硫率が高位安定するため、極低燐
低硫鋼等の高級鋼の製造が容易になり、その効果は極め
て大きい。<Effect of the Invention> The present invention brings about an improvement in the dephosphorization effect by appropriately mixing and using CaF 2 and Al 2 O 3 as a slagging agent for CaO, thereby significantly reducing the basic unit of the dephosphorization agent. In addition to making it possible, the reduction in processing time brings with it a smooth operation, and since the simultaneous desulfurization rate is stable at a high level, the production of high-grade steel such as ultra-low phosphorus low-sulfur steel becomes easy, and its effect Is extremely large.
第１図は脱燐剤中のCaO／Ｏ比と脱燐率の関係を示す
図、第２図は脱燐剤中の(CaF2＋Al2O3)／CaOと脱燐率の
関係を示す図、第３図は脱燐剤中のAl2O3／CaF2比と脱
燐率および脱硫率の関係を示す図、第４図は気酸比率と
脱燐率の関係を示す図である。Fig. 1 shows the relationship between the CaO / O ratio in the dephosphorization agent and the dephosphorization rate, and Fig. 2 shows the relationship between the (CaF 2 + Al 2 O 3 ) / CaO in the dephosphorization agent and the dephosphorization rate. FIG. 3 is a diagram showing the relationship between the Al 2 O 3 / CaF 2 ratio in the dephosphorizing agent and the dephosphorization rate and the desulfurization rate, and FIG. 4 is a diagram showing the relationship between the vapor acid ratio and the dephosphorization rate. .
Claims (1)
及び／もしくは気体酸素源と不可避的に混入する不純物
からなり、CaOの重量と前記酸素源中の酸素の重量比CaO
／Ｏが１．０〜２．５、Al2O3とCaF2の総量とCaOの重量
比(Al2O3+CaF2)/CaOが０．１〜１．０であり、かつAl2O
3とCaF2の重量比Al2O３／CaF2が０．０５〜２０．０で
ある脱燐剤を溶銑に添加することを特徴とする溶銑の脱
燐方法。1. A component comprises CaO, Al 2 O 3 , CaF 2 and a solid oxygen source and / or an impurity that is inevitably mixed with a gaseous oxygen source, and the weight ratio of CaO to the oxygen in the oxygen source. CaO
/ O is 1.0 to 2.5, the total amount of Al 2 O 3 and CaF 2 and the weight ratio of CaO (Al 2 O 3 + CaF 2 ) / CaO is 0.1 to 1.0, and Al 2 O
3 and dephosphorization method hot metal weight ratio Al 2 O 3 / CaF 2 of CaF 2, characterized in that the addition of a dephosphorization agent is from 0.05 to 20.0 in the hot metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61198220A JPH0617496B2 (en) | 1986-08-26 | 1986-08-26 | Method for dephosphorizing hot metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61198220A JPH0617496B2 (en) | 1986-08-26 | 1986-08-26 | Method for dephosphorizing hot metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6357712A JPS6357712A (en) | 1988-03-12 |
| JPH0617496B2 true JPH0617496B2 (en) | 1994-03-09 |
Family
ID=16387498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61198220A Expired - Lifetime JPH0617496B2 (en) | 1986-08-26 | 1986-08-26 | Method for dephosphorizing hot metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617496B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW387948B (en) * | 1998-03-25 | 2000-04-21 | Kawasaki Steel Co | Method for processing electroplating sludge |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5816009A (en) * | 1981-07-22 | 1983-01-29 | Nippon Steel Corp | Dephosphorizing method for molten metal |
-
1986
- 1986-08-26 JP JP61198220A patent/JPH0617496B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5816009A (en) * | 1981-07-22 | 1983-01-29 | Nippon Steel Corp | Dephosphorizing method for molten metal |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6357712A (en) | 1988-03-12 |
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