JPH0270014A - Dephosphorization treatment of molten iron - Google Patents
Dephosphorization treatment of molten ironInfo
- Publication number
- JPH0270014A JPH0270014A JP22292388A JP22292388A JPH0270014A JP H0270014 A JPH0270014 A JP H0270014A JP 22292388 A JP22292388 A JP 22292388A JP 22292388 A JP22292388 A JP 22292388A JP H0270014 A JPH0270014 A JP H0270014A
- Authority
- JP
- Japan
- Prior art keywords
- dephosphorization
- period
- molten iron
- cao
- 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.)
- Granted
Links
- 238000011282 treatment Methods 0.000 title claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract description 20
- 229910052742 iron Inorganic materials 0.000 title abstract description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 27
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 14
- 239000000292 calcium oxide Substances 0.000 claims abstract description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000007800 oxidant agent Substances 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 30
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 15
- 239000012159 carrier gas Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 22
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 238000007664 blowing Methods 0.000 abstract description 2
- 238000005261 decarburization Methods 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 239000002893 slag Substances 0.000 abstract 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 12
- 229910052698 phosphorus Inorganic materials 0.000 description 12
- 239000011574 phosphorus Substances 0.000 description 12
- 230000007423 decrease Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- AFCIMSXHQSIHQW-UHFFFAOYSA-N [O].[P] Chemical compound [O].[P] AFCIMSXHQSIHQW-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は溶銑の脱燐処理法に関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for dephosphorizing hot metal.
（従来の技術）
溶銑での脱燐処理を行うことにより製鋼過程における脱
燐のために使用される副原料の使用量を減じて鋼を製造
することはよく知られている。(Prior Art) It is well known that steel can be manufactured by dephosphorizing hot metal to reduce the amount of auxiliary raw materials used for dephosphorization in the steel manufacturing process.
例えば特開昭５８−７３７０９号公報には珪素含有量０
．２５％以下の溶銑浴中に、粉状の脱燐・脱硫剤をキャ
リヤガスとともにインジェクションするに際し、インジ
ェクションに供する液体を組成する気体酸素または固体
酸素源よりなる酸化剤の量を、溶銑燐濃度の推移に応じ
て制御し、脱燐を促進することを特徴とする溶銑の予備
処理方法が開示されている。For example, in JP-A-58-73709, the silicon content is 0.
．． When injecting a powdered dephosphorization/desulfurization agent together with a carrier gas into a hot metal bath with a concentration of 25% or less, the amount of the oxidizing agent consisting of gaseous oxygen or solid oxygen source that composes the liquid to be injected is adjusted according to the hot metal phosphorus concentration. A method for pretreatment of hot metal is disclosed, which is characterized by controlling according to the transition and promoting dephosphorization.
（発明が解決しようとする課題）
前記従来技術は、脱炭、脱マンガンなど有用成分の消耗
を抑制しつつ、脱燐、脱硫を行うことを目的としており
、溶銑燐濃度が０．０３〜００５％に達したとき脱燐、
脱硫剤による脱燐効率が低下するという知見に基づいて
、溶銑燐濃度が０．０４％を境にして吹き込み酸素比を
変化させるという技術である。(Problems to be Solved by the Invention) The purpose of the above-mentioned conventional technology is to perform dephosphorization and desulfurization while suppressing consumption of useful components such as decarburization and demanganization. Dephosphorization when reaching %
Based on the knowledge that the dephosphorization efficiency of desulfurization agents decreases, this technology changes the blowing oxygen ratio when the hot metal phosphorus concentration reaches 0.04%.
しかしながらこの技術は、脱燐処理工程の後期における
処理に関するものであるから、脱燐、脱硫剤が節約でき
るとしてもその効果はそう大きくはない。However, since this technique relates to treatment in the latter stage of the dephosphorization treatment process, even if dephosphorization and desulfurization agents can be saved, the effect is not so great.
（課題を解決するための手段）
本発明者らは、溶銑の脱燐処理工程全体についてより詳
細に検討を加えた結果、脱燐処理剤の配合条件及びその
添加時期に関する新しい知見を得て、本発明を完成した
。(Means for Solving the Problems) As a result of a more detailed study of the entire hot metal dephosphorization process, the present inventors obtained new knowledge regarding the blending conditions of the dephosphorization agent and the timing of its addition. The invention has been completed.
即ち、本発明は、溶銑浴中に生石灰系の精錬フラックス
及び酸化剤をキャリヤガスによりインジェクションして
溶銑の脱燐処理を行うに際し、上記酸化剤として、酸化
鉄、Ｍ、ｎ鉱石および気体酸素を１種または複合して用
いて、脱珪が優先的に進行し脱燐の進行が遅い脱燐初期
には脱燐処理剤中Ｃａ Ｏ／ Ｏ比を２．３〜３．０の
範囲内とし、その後は脱燐処理剤中Ｃａ Ｏ／ Ｏ比を
１．７〜２．２の範囲内として脱燐処理を行うことを特
徴とする溶銑の脱燐処理法である。That is, the present invention provides for dephosphorizing hot metal by injecting a quicklime-based refining flux and an oxidizing agent into a hot metal bath using a carrier gas. When used alone or in combination, the Ca O/O ratio in the dephosphorization treatment agent is kept within the range of 2.3 to 3.0 in the early stages of dephosphorization, when desiliconization proceeds preferentially and dephosphorization progresses slowly. This is a method for dephosphorizing hot metal, which is characterized in that the dephosphorization treatment is then carried out with the Ca O/O ratio in the dephosphorization treatment agent within the range of 1.7 to 2.2.
（作 用）
溶銑の脱燐処理工程を、脱珪が優先的に進行し脱燐の進
行が遅い脱燐反応ステージ１期と、脱珪が終了し脱燐が
速やかに進行する脱燐反応ステージ■期と、溶銑中の燐
含有率が低下し再び脱燐の進行が停滞する脱燐反応ステ
ージ■期に分けた場合、それぞれの脱燐反応ステージに
おける脱燐剤配合比（ＣａＯ１０比体最適値が存在する
ので、それぞれの該ステージにおいて脱燐剤配合比を最
適にコントロールすることにより、脱燐処理時間の短縮
及び脱燐剤の原単位低減を図ることが可能である。(Function) The dephosphorization process of hot metal is divided into the first stage of the dephosphorization reaction, in which desiliconization proceeds preferentially and dephosphorization progresses slowly, and the dephosphorization reaction stage, in which desiliconization is completed and dephosphorization proceeds quickly. When divided into stage (2) and stage (2), a dephosphorization reaction stage in which the phosphorus content in the hot metal decreases and the progress of dephosphorization stagnates again, the dephosphorization agent blending ratio (CaO10 ratio optimum value Therefore, by optimally controlling the dephosphorizing agent compounding ratio in each stage, it is possible to shorten the dephosphorizing treatment time and reduce the unit consumption of the dephosphorizing agent.
（実施例）
第１図は脱燐剤使用量と溶銑中の燐濃度との関係を脱燐
反応ステージ毎に区分して示した図である。なお、第１
〜２図中の記号はそれぞれ同−処理の中間サンプリング
データを示す。(Example) FIG. 1 is a diagram showing the relationship between the amount of dephosphorizing agent used and the phosphorus concentration in hot metal, divided by dephosphorization reaction stage. In addition, the first
~2 Symbols in the figures each indicate intermediate sampling data of the same process.
同図に示すとおり、各ステージの脱燐挙動は次のような
特徴を有する。As shown in the figure, the dephosphorization behavior at each stage has the following characteristics.
■期、脱珪が優先的に進行し、脱燐の進行が遅い（溶銑
中Ｓｉが０．０５％に低下するまでの期間）。In stage (2), desiliconization progresses preferentially, and dephosphorization progresses slowly (period until Si in the hot metal drops to 0.05%).
■期：脱珪が終了し、脱燐が速やかに進行する。■Stage: De-siliconization is completed and dephosphorization progresses rapidly.
■期：［Ｐ］が低下し、再び脱燐の進行が停滞する。■Phase: [P] decreases, and the progress of dephosphorization stagnates again.
第２図は溶銑中の燐濃度と脱燐酸素効率との関係を示す
図で、溶銑の脱燐処理中の連続サンプリングからえたも
のである。この図から分かるように溶銑中の燐［Ｐ］が
低下するのに伴って脱燐酸素効率η１は低−高一低と変
化している。これは上記燐反応ステージに対応するもの
と考えられ、特に１期、■期の脱燐酸素効率の処理間に
おける差が大きい。ここで、脱燐酸素効率（η ）とは
次式で定義したものをいう。Figure 2 is a diagram showing the relationship between the phosphorus concentration in hot metal and the dephosphorization oxygen efficiency, and was obtained from continuous sampling during the hot metal dephosphorization process. As can be seen from this figure, as the phosphorus [P] in the hot metal decreases, the dephosphorization oxygen efficiency η1 changes from low to high to low. This is considered to correspond to the above-mentioned phosphorus reaction stage, and there is a particularly large difference between the treatments in the phosphorus deoxidation efficiency in the 1st stage and the 2nd stage. Here, the dephosphorization oxygen efficiency (η) is defined by the following formula.
脱燐酸素効率（ηｐ）−（脱燐に消費された酸素）Ｘ１
００／（酸化鉄中酸素＋Ｍｎ鉱石中酸素士気体酸素−脱
珪に消費された酸素）（％）・・・・・・■
なおＭｎ鉱石中には酸素源としてＭ ｎ Ｏ、Ｗｉ ｎ
Ｏ２゜ＦｅＯ等を含んでいる。Dephosphorization oxygen efficiency (ηp) - (oxygen consumed for dephosphorization) X1
00/(Oxygen in iron oxide + Oxygen gas in Mn ore - Oxygen consumed for desiliconization) (%) ......
Contains O2°FeO, etc.
本発明者らは前記脱燐ステージ毎の脱燐酸素効率につい
て更に検討を行った結果、脱燐酸素効率は脱燐剤の組成
によって定まる脱燐剤中のＣａＯ１０比によって変化し
、そしてこのＣａ Ｏ／ Ｏ比は各脱燐反応ステージ毎
に最適値が存在することを知見した。The present inventors further investigated the dephosphorization oxygen efficiency for each dephosphorization stage, and found that the dephosphorization oxygen efficiency changes depending on the CaO10 ratio in the dephosphorization agent, which is determined by the composition of the dephosphorization agent, and this CaO /O ratio was found to have an optimum value for each dephosphorization reaction stage.
なお、ここでいうｃ ａ Ｏ／ Ｏ比とは次式で定義し
た値をいう。Note that the ca O/O ratio herein refers to a value defined by the following formula.
Ｃａ Ｏ／ Ｏ＝ Ｃａ Ｏ吹込量（Ｋｇ）／［酸化鉄
中酸素（Ｋｇ） ４− Ｍ ｎ鉱石中酸素（Ｋｇ）十気
体酸素（Ｎｍ３）ｘ３２／２２．４］・・・・・・・・
・・・■第３図は脱燐反応ステージ１期におけるＣａＯ
１０比と脱燐酸素効率ηｐとの関係を示す図である。Ca O / O = Ca O injection amount (Kg) / [Oxygen in iron oxide (Kg) 4- M n Oxygen in ore (Kg) 10 Gaseous oxygen (Nm3) x 32/22.4] ...・
...■Figure 3 shows CaO in the first stage of the dephosphorization reaction.
10 is a diagram showing the relationship between the 10 ratio and the dephosphorization oxygen efficiency ηp.
第３図に示すように、脱燐反応ステージ１期においては
、Ｃａ Ｏ／ Ｏ比が３．０以下の範囲内ではＣａ Ｏ
／ Ｏを上げるとη２は高くなるが特にＣａ Ｏ／ Ｏ
比が２３以上でその傾向が強い。As shown in Figure 3, in the first dephosphorization reaction stage, if the CaO/O ratio is 3.0 or less, CaO
/O increases, η2 increases, but especially CaO/O
This tendency is strong when the ratio is 23 or higher.
第４図は脱燐反応ステージ■期におけるＣａＯ１０比と
脱燐酸素効率η２との関係を示す図である。FIG. 4 is a diagram showing the relationship between the CaO10 ratio and the dephosphorization oxygen efficiency η2 in the dephosphorization reaction stage II.
同図に示すように、脱燐反応ステージ■期においては、
脱燐剤中Ｃａ Ｏ／ Ｏが高くなるとηｐは向上するが
、Ｃａ Ｏ／ Ｏが１８の点に屈曲点が存在し、この点
を超えるとη２は逆に低下傾向を示す。故に該■期にお
いては脱燐剤中Ｃａ Ｏ／ ０を１．８とすべきである
が、実際には操業条件等によるバラツキが存在しＣａ
Ｏ／ Ｏを１点にコンるのが有効である。As shown in the figure, in the dephosphorization reaction stage II,
As the Ca O/O content in the dephosphorizing agent increases, ηp improves, but there is a bending point at a point where Ca O/O is 18, and beyond this point, η2 shows a decreasing tendency. Therefore, Ca O/0 in the dephosphorizing agent should be 1.8 in the period (①), but in reality, there are variations due to operating conditions, etc.
It is effective to condense O/O to one point.
Ｃａ Ｏ７’ Ｏ比が１．７未満ではη２が低過ぎ、逆
に２６２超でもηｐは低下する。If the CaO7'O ratio is less than 1.7, η2 is too low, and conversely, even if it exceeds 262, ηp decreases.
第５図は脱燐反応ステージ■期における脱燐剤中Ｃａ
Ｏ／ Ｏ比と脱燐酸素効率ηｐとの関係を示ず図である
。Figure 5 shows the Ca in the dephosphorizing agent at the dephosphorization reaction stage II.
FIG. 3 is a diagram showing the relationship between the O/O ratio and the dephosphorization oxygen efficiency ηp.
第５図に示すように、該ステージ■についてもステージ
■と同様の傾向がある。即ちＣａ Ｏ／ ０比が１８ま
ではＣａ Ｏ／ Ｏ比の値が大になる程η１は向」ニす
るが、１８以」二ではη２の向上は無く、Ｃ＋１ＬＯ１
０比が２．２を超えるとηｐは低下する。従ってステー
ジ■についてもステージ■と同様にＣａ Ｏ／ ０比を
１．７〜２．２の範囲内にコントロールするのが有効で
ある。η２の値そのちのはステージＨに比較して低い値
となっているが、これは従来より溶銑中燐濃度が低下す
ると脱燐反応は酸素供給律速から溶銑中燐の物質移動律
速に移行して脱燐速度が減少するためと考えられている
。As shown in FIG. 5, there is a similar tendency for stage (2) as for stage (2). That is, up to a Ca O/O ratio of 18, η1 increases as the value of the Ca O/O ratio increases, but after 18, there is no improvement in η2, and C+1LO1
When the zero ratio exceeds 2.2, ηp decreases. Therefore, it is effective to control the Ca O/0 ratio within the range of 1.7 to 2.2 for stage (2) as well as for stage (2). The value of η2 is lower than that at stage H, but this is because when the phosphorus concentration in hot metal decreases, the dephosphorization reaction shifts from oxygen supply rate-limiting to rate-limiting mass transfer of phosphorus in hot metal. This is thought to be due to a decrease in the dephosphorization rate.
本発明において、溶銑の脱燐処理工程で脱燐処理剤中の
Ｃａ Ｏ／ Ｏ比を変更するのは、脱燐反応ステージ１
期と■期の間であって脱燐処理工程の前段であり、そし
てその変更点は溶銑中のＳｉの値が００５％に低減した
時点とすることができる。In the present invention, changing the Ca O/O ratio in the dephosphorizing agent in the dephosphorizing process of hot metal is carried out in the dephosphorizing reaction stage 1.
It is between the period and the stage (2) and is the first stage of the dephosphorization treatment process, and the change point can be made at the time when the Si value in the hot metal has decreased to 0.005%.
第３図から第５図中プロットの層別は、０印はＭｎ鉱石
使用の場合であり、・印はＭｎ鉱石を使用しない場合で
ある。The stratification of the plots in FIGS. 3 to 5 is as follows: 0 mark indicates the case where Mn ore is used, and * mark indicates the case where Mn ore is not used.
結局第３図から第５図による脱燐反応の酸素源として酸
化鉄、Ｍｎ鉱石、気体酸素の何れを用いても、また複合
して用いても酸素を重量換算すれば全て等価に扱え、脱
燐酸素効率で比較すればよいことが分かる。After all, no matter which one of iron oxide, Mn ore, or gaseous oxygen is used as the oxygen source for the dephosphorization reaction shown in FIGS. It can be seen that the comparison can be made in terms of phosphorus-oxygen efficiency.
一方高Ｍ ｎ ＠の溶製に際しては、溶銑脱燐段階でＭ
ｎ鉱石を使用しても溶銑中Ｍｎ濃度を予め高めておくの
がＭｎ鉱石を使用しない場合よりも転炉で用いるＭｎ系
合金鉄が削減できる点でコスト上有利となる。On the other hand, when melting with high M n@, M
Even if N ore is used, increasing the Mn concentration in the hot metal in advance is more cost-effective than not using Mn ore because the amount of Mn-based alloy iron used in the converter can be reduced.
（発明の効果）
以上述べたように本発明によれば、溶銑の脱燐処理工程
を脱燐反応ステージ毎に区分すると共に、各ステージ毎
に脱燐処理剤の組成を最適にして脱燐処理を行うもので
あるから、脱燐反応効率を高めることができ、脱燐処理
剤の原単位低減、処理時間の短縮、溶銑温度降下の防止
が図れる等の顕著な効果を奏する。(Effects of the Invention) As described above, according to the present invention, the dephosphorization treatment process of hot metal is divided into each dephosphorization reaction stage, and the composition of the dephosphorization treatment agent is optimized for each stage. Therefore, the efficiency of the dephosphorization reaction can be increased, and remarkable effects such as a reduction in the unit consumption of the dephosphorization treatment agent, a reduction in treatment time, and prevention of a drop in hot metal temperature can be achieved.
第１図は脱燐剤使用量と溶銑中の燐濃度との関係を脱燐
反応ステージ毎に区分して示した図、第２図は溶銑中の
燐濃度と脱燐酸素効率との関係を示す図、第３図は脱燐
反応ステージ１期におけるＣ ａ Ｏ／ Ｏ比と脱燐酸
素効率との関係を示す図、第４図は脱燐反応ステージ■
期におけるＣａＯ１０比と脱燐酸素効率との関係を示す
図、第５図は脱燐反応ステージ■期における脱燐剤中Ｃ
ａｂ１０比と脱燐酸素効率との関係を示す図である。
１】
図面の浄書（内容に変更なし）
第１図
覗＃＋御便重量
（陥／ＴＰ ）
第５図
Ｃ，Ｃ１０／○
響５乍８．６乙七
手続補正書（方式）
％式％
事件の表示
昭和６３年特許願第２２２９２３号
発明の名称
溶銑の脱燐処理法
３補正をする者
事件との関係 特許 出願人
住 所 東京都千代田区大手町２丁目６番３号（６６
５）新日本製鐵株式会社
代理人〒１０３ 置 ２４１−０４４１住 所 東京
都中央区日本橋本町１丁目６番３号日本橋ダイヤモンド
マンション５０１号昭和６３年１１月２９日（全送日）
６補正の対象
願書、明細書、全文及び図面
７補正の内容Figure 1 shows the relationship between the amount of dephosphorizing agent used and the phosphorus concentration in the hot metal, divided by dephosphorization reaction stage, and Figure 2 shows the relationship between the phosphorus concentration in the hot metal and the dephosphorization oxygen efficiency. Figure 3 shows the relationship between C a O/O ratio and dephosphorization oxygen efficiency in the first stage of the dephosphorization reaction, and Figure 4 shows the relationship between the dephosphorization reaction stage ■
Figure 5 shows the relationship between CaO10 ratio and dephosphorization oxygen efficiency in the dephosphorization reaction stage.
It is a figure showing the relationship between ab10 ratio and dephosphorization oxygen efficiency. 1] Engraving of the drawings (no change in content) Figure 1 Preview # + Postage weight (Fail/TP) Figure 5 C, C10/○ Hibiki 5-8.6 Otsu-7 Procedural amendment (method) % formula % Display of the case Patent application No. 222923 filed in 1988 Name of the invention Hot metal dephosphorization treatment method 3 Person who makes amendments Relationship to the case Patent Applicant address 2-6-3 Otemachi, Chiyoda-ku, Tokyo (66
5) Agent for Nippon Steel Corporation Address: 501 Nihonbashi Diamond Mansion, 1-6-3 Nihonbashi Honmachi, Chuo-ku, Tokyo 103-241-0441 November 29, 1988 (all date of delivery) 6th Amendment Contents of the subject application, specification, full text, and drawing 7 amendments
Claims (1)
リヤガスによりインジェクションして溶銑の脱燐処理を
行うに際し、上記酸化剤として、酸化鉄、Ｍｎ鉱石およ
び気体酸素を１種または複合して用いて、脱珪が優先的
に進行し脱燐の進行が遅い脱燐初期には脱燐処理剤中Ｃ
ａＯ／Ｏ比を２．３〜３．０の範囲内とし、その後は脱
燐処理剤中ＣａＯ／Ｏ比を１．７〜２．２の範囲内とし
て脱燐処理を行うことを特徴とする溶銑の脱燐処理法。When dephosphorizing hot metal by injecting a quicklime-based refining flux and an oxidizing agent into a hot metal bath using a carrier gas, iron oxide, Mn ore, and gaseous oxygen are used alone or in combination as the oxidizing agent. In the early stages of dephosphorization, when desiliconization proceeds preferentially and dephosphorization progresses slowly, C in the dephosphorization treatment agent
The dephosphorization treatment is performed by setting the aO/O ratio within the range of 2.3 to 3.0, and then performing the dephosphorization treatment with the CaO/O ratio in the dephosphorization treatment agent within the range of 1.7 to 2.2. Hot metal dephosphorization treatment method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22292388A JPH0270014A (en) | 1988-09-06 | 1988-09-06 | Dephosphorization treatment of molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22292388A JPH0270014A (en) | 1988-09-06 | 1988-09-06 | Dephosphorization treatment of molten iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0270014A true JPH0270014A (en) | 1990-03-08 |
| JPH0514004B2 JPH0514004B2 (en) | 1993-02-24 |
Family
ID=16789983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22292388A Granted JPH0270014A (en) | 1988-09-06 | 1988-09-06 | Dephosphorization treatment of molten iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0270014A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003029497A1 (en) * | 2001-09-27 | 2003-04-10 | Nippon Steel Corporation | Method for dephsophorization of molten irona |
| JP2020059866A (en) * | 2018-10-05 | 2020-04-16 | Ｊｆｅスチール株式会社 | Hot metal pretreatment method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6026608A (en) * | 1983-07-25 | 1985-02-09 | Nippon Steel Corp | Method for dephosphorizing molten iron |
-
1988
- 1988-09-06 JP JP22292388A patent/JPH0270014A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6026608A (en) * | 1983-07-25 | 1985-02-09 | Nippon Steel Corp | Method for dephosphorizing molten iron |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003029497A1 (en) * | 2001-09-27 | 2003-04-10 | Nippon Steel Corporation | Method for dephsophorization of molten irona |
| EP1445337A4 (en) * | 2001-09-27 | 2005-09-21 | Nippon Steel Corp | Method for dephsophorization of molten irona |
| JP2020059866A (en) * | 2018-10-05 | 2020-04-16 | Ｊｆｅスチール株式会社 | Hot metal pretreatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0514004B2 (en) | 1993-02-24 |
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