JPH0499112A - Method for desiliconizing and desulfurizing molten iron at the same time - Google Patents
Method for desiliconizing and desulfurizing molten iron at the same timeInfo
- Publication number
- JPH0499112A JPH0499112A JP20480890A JP20480890A JPH0499112A JP H0499112 A JPH0499112 A JP H0499112A JP 20480890 A JP20480890 A JP 20480890A JP 20480890 A JP20480890 A JP 20480890A JP H0499112 A JPH0499112 A JP H0499112A
- Authority
- JP
- Japan
- Prior art keywords
- molten iron
- hot metal
- desulfurization
- desiliconization
- powder
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract description 25
- 229910052742 iron Inorganic materials 0.000 title abstract description 12
- 230000003009 desulfurizing effect Effects 0.000 title abstract description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 20
- 230000023556 desulfurization Effects 0.000 claims abstract description 20
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 18
- 239000000292 calcium oxide Substances 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 17
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 16
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011593 sulfur Substances 0.000 claims abstract description 14
- 235000019738 Limestone Nutrition 0.000 claims abstract description 13
- 239000006028 limestone Substances 0.000 claims abstract description 13
- 239000011651 chromium Substances 0.000 claims abstract description 11
- 239000010703 silicon Substances 0.000 claims abstract description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 38
- 239000002184 metal Substances 0.000 claims description 38
- 238000007670 refining Methods 0.000 abstract description 5
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000002893 slag Substances 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 238000007664 blowing Methods 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、シリコンを含有し、しかも比較的硫黄濃度の
高い溶銑の脱硫を、脱珪とともに、溶銑の温度を低下さ
せずに行う方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for desulfurizing hot metal containing silicon and having a relatively high sulfur concentration, as well as desiliconization, without lowering the temperature of the hot metal. .
近年、ステンレス鋼あるいは普通鋼の製造プロセスとし
て溶融還元法が種々開発・検討されている。これは従来
の電気炉や高炉に替えてシャフト炉や転炉を用い、コー
クスや石炭などの炭材を還元剤および熱源として、クロ
ム鉱石、鉄鉱石を直接溶融還元する方法である。また、
これら溶融還元機能に加えスクラップの同時溶解機能を
具備したものも検討されている。In recent years, various melt reduction methods have been developed and studied as a manufacturing process for stainless steel or ordinary steel. This method uses a shaft furnace or a converter instead of a conventional electric furnace or blast furnace, and uses carbonaceous materials such as coke or coal as a reducing agent and heat source to directly melt and reduce chromium ore and iron ore. Also,
In addition to these melting and reduction functions, devices with a simultaneous scrap melting function are also being considered.
これら種々の溶融還元法のうち、シャフト炉を用いる場
合には１溶銑中にシリコンと硫黄を同時にしかも高濃度
で含有されるときがある。シリコンがシャフト炉の場合
高くなるのは、この方法が原理上酸素ポテンシャルの非
常に低いところで行われるためであり、Ｓｉｎｇも還元
されてしまうことによる。この還元反応はＳｉｎ、ガス
を介して行われるとされている。また、シャフト炉内で
の生産性を向上させるためにスラグの塩基度を小さくし
且つその融点を低下させることが行われ、これによって
炉内でのガスの通気性およびスラグやメタルの溶融滴下
性を改善する方策が採られることがある。この場合、ス
ラグの塩基度が低いために炉内で脱硫が進行せず、溶銑
中の硫黄濃度が必然的に高くなる。特に、クロム鉱石の
還元が必要なステンレス鋼母溶銑の製造の場合にはスラ
グの流動性を確保する観点から塩基度を小さくせざるを
得ない場合が多く、溶銑中の硫黄濃度が０．１％を超え
る場合もめずらしくない。Among these various smelting reduction methods, when a shaft furnace is used, silicon and sulfur are sometimes contained simultaneously and at a high concentration in one hot metal. The reason why silicon is expensive in a shaft furnace is because this method is performed in principle at a very low oxygen potential, and Sing is also reduced. This reduction reaction is said to be carried out via Sin gas. In addition, in order to improve productivity in shaft furnaces, the basicity of slag is reduced and its melting point is lowered. Measures may be taken to improve this. In this case, desulfurization does not proceed in the furnace because the basicity of the slag is low, and the sulfur concentration in the hot metal inevitably increases. In particular, in the production of stainless steel mother hot metal that requires the reduction of chromium ore, the basicity must be reduced in many cases to ensure fluidity of the slag, and the sulfur concentration in the hot metal is 0.1. It is not uncommon for it to exceed %.
この硫黄濃度の高い溶銑の脱硫を、現状の脱硫法で、す
なわちＣａｂ−ＣａＦｚ系フラックスの不活性ガスによ
る吹き込みという方法で行えば、フラックスの原単位が
大きいために大きな温度低下をまねくことになる。その
ため、ハンドリング温度が確保できなかったり、また、
この温度を確保しようとすれば溶銑温度を上げる必要が
あり、シャフト炉での熱負荷が増大することになり、設
備。If this hot metal with a high sulfur concentration is desulfurized using the current desulfurization method, that is, by blowing Cab-CaFz-based flux with inert gas, the basic unit of flux is large, resulting in a large temperature drop. . As a result, the handling temperature may not be secured, or
In order to maintain this temperature, it is necessary to raise the hot metal temperature, which increases the heat load on the shaft furnace, which increases the equipment.
操業、コストすべての面で不利な条件となってしまう。This would result in disadvantageous conditions in terms of operation and cost.
本発明はこのような問題を解決することを目的としたも
のである。The present invention aims to solve such problems.
〔発明の構成］
本発明は、シリコンと硫黄を含有した溶銑中に粉状脱硫
剤を気体酸素と共にインジェクションすることを特徴と
する。粉状脱硫剤は１石灰石粉と生石灰粉をそれぞれ１
０から８０重量％の範囲で含有した粉体を使用する。溶
銑は含クロム溶銑であることができ、含クロム溶銑であ
っても、クロムの酸化ロスを抑制できる。[Structure of the Invention] The present invention is characterized in that a powdered desulfurizing agent is injected together with gaseous oxygen into hot metal containing silicon and sulfur. Powdered desulfurization agent is 1 limestone powder and 1 quicklime powder each.
A powder with a content in the range of 0 to 80% by weight is used. The hot metal can be chromium-containing hot metal, and even if it is chromium-containing hot metal, oxidation loss of chromium can be suppressed.
〔作用］
本発明によれば、シリコンを含有し且つ比較的硫黄濃度
の高い溶銑の脱硫を脱珪と同時にしかも溶銑の温度を低
下させずに行うことができる。[Operation] According to the present invention, desulfurization of hot metal containing silicon and having a relatively high sulfur concentration can be performed simultaneously with desiliconization without lowering the temperature of the hot metal.
本発明者らは、前記の問題を解決すべく、脱珪時の発熱
反応を利用し同時に脱硫することを考えた。すなわち、
気体酸素をＣａ０−ｆｌｐとともに吹き込み９発熱反応
であるＳｉ＋０□＝ＳｉＯ□（気体酸素による脱珪反応
）やＣ＋１／２０２＝ ＣＯ（気体酸素による脱炭反応
）などの反応熱を用いながら温度低下を抑制しつつ、一
方ではメタル浴面上に還元性のトップスラグを生成させ
、このスラグムこより脱硫しようとする方法である。こ
こでＣａＯ源としては生石灰と石灰石を温度コントロー
ルを兼ねて用いる。さらに具体的にいえば、吹き込み羽
口近傍では脱珪反応とそれに伴う発熱とを、また浮上過
程では生成したＦｅＯを含むＣａｂ−３ｉｎ２系スラグ
をＳｉおよびＣで１次式のように２ ＦｅＯ＋Ｓｉ＝
２ Ｆｅ＋５ｉＯｚ。In order to solve the above problem, the present inventors considered desulfurization at the same time by utilizing the exothermic reaction during desiliconization. That is,
Gaseous oxygen is blown in with Ca0-flp to lower the temperature while using the reaction heat of exothermic reactions such as Si+0□=SiO□ (desiliconization reaction with gaseous oxygen) and C+1/202=CO (decarburization reaction with gaseous oxygen). In this method, while suppressing the sulfur content, on the other hand, a reducing top slag is generated on the metal bath surface, and this slag is used to desulfurize. Here, quicklime and limestone are used as CaO sources, which also serve as temperature control. More specifically, in the vicinity of the blowing tuyere, the desiliconization reaction and associated heat generation are carried out, and in the flotation process, the generated Cab-3in2 slag containing FeO is treated with Si and C as shown in the linear equation 2FeO+Si=
2 Fe+5iOz.
ＦｅＯ＋ Ｃ＝ ＣＯ。FeO+C=CO.
還元させ、これによって、トップスラグ中の（％Ｆｅｄ
）を十分低下させて脱硫のための還元性を付与させると
いう原理である。This reduces the (%Fed) in the top slag.
) is sufficiently lowered to provide reducing properties for desulfurization.
なお、ここで石灰石を添加する理由は
ＣａＣＯ５→ＣａＯ＋ＣＯｔ
の分解反応による吸熱を利用し、Ｓｉｎ、生成時の発熱
反応とのバランスでメタル浴の温度を一定に保持するこ
と、および安価な石灰石をＣａＯ源としても用いること
である。また、吹き込み羽口あるいは吹き込みノズル先
端近傍での過大な温度上昇を防ぎ、これら羽口やノズル
の溶損を防止し長寿命で用いることもそのねらいとして
いる。The reason for adding limestone here is to utilize the endothermic reaction of the decomposition reaction of CaCO5 → CaO + COt, to maintain the temperature of the metal bath constant in balance with the exothermic reaction during the generation of Sin, and to use inexpensive limestone as CaO. It can also be used as a source. The aim is also to prevent excessive temperature rise near the tip of the blowing tuyeres or blowing nozzles, and to prevent these tuyeres and nozzles from being melted and damaged so that they can be used for a long time.
使用する石灰石粉と生石灰粉はそれぞれ１０から８０重
量％の範囲でインジェクションする粉体中に含有させれ
ばよい。また気体酸素は純酸素、酸素冨化空気或いは空
気であってもよい。The limestone powder and quicklime powder used may each be contained in the powder to be injected in a range of 10 to 80% by weight. The gaseous oxygen may also be pure oxygen, oxygen-enriched air, or air.
第１図に示した精錬容器ｌを使用して１本発明法を実施
した。精錬容器Ｉの側壁にはインジェクション用のノズ
ル２が設けられている。このノズル２は、そのノズル口
の方向が炉底のほぼ中心に向かうように、容器側壁の外
側から内側に向けて傾斜を有した単管ノズルであり、セ
ラミックスバイブからなっている。ノズル口は炉内溶銑
３より場面下に位置していることから、溶銑３内に直接
インジェクションが行われる。インジェクション操作を
行なうとノズル口には凝固物からなる別のノズル口（マ
ンシュルーム形状）が形成し、このためにノズルが保護
される。４は測温管を示している。One method of the present invention was carried out using the refining vessel 1 shown in FIG. An injection nozzle 2 is provided on the side wall of the refining vessel I. This nozzle 2 is a single tube nozzle having an inclination from the outside to the inside of the side wall of the container so that the direction of the nozzle opening is directed toward approximately the center of the furnace bottom, and is made of a ceramic vibrator. Since the nozzle opening is located below the hot metal 3 in the furnace, injection is performed directly into the hot metal 3. When the injection operation is performed, another nozzle opening (manshroom shape) made of solidified material is formed at the nozzle opening, thereby protecting the nozzle. 4 indicates a temperature measuring tube.
実験は、該容器ｌ内に５ ｔｏｎの溶銑３を入れて行わ
れた。溶銑３としては、クロムを約１２％含有するステ
ンレス製造用溶銑が使用された。この溶銑の初期成分は
Ｃｒ ： １２．５％、Ｃ：５．４９％、Ｓｉ：０．９
４％、 Ｓ ： ０．０６１％である。処理前の溶銑
温度は１４１５°Ｃであり、粉体と気体酸素を直接溶銑
中に吹き込んで同時脱珪脱硫と温度低下の防止を狙った
実験を行った。The experiment was conducted with 5 tons of hot metal 3 placed in the vessel 1. As hot metal 3, hot metal for producing stainless steel containing about 12% chromium was used. The initial components of this hot metal are Cr: 12.5%, C: 5.49%, Si: 0.9
4%, S: 0.061%. The temperature of the hot metal before treatment was 1415°C, and an experiment was conducted with the aim of simultaneous desiliconization and desulfurization and prevention of temperature drop by blowing powder and gaseous oxygen directly into the hot metal.
用いた粉体の組成は６２％生石灰粉−３０％石灰石粉−
８％ホタル石破砕粉である。ホタル石はスラグの流動性
を確保するために添加されたものである。気体酸素の供
給速度は３ Ｎｍ３／ｗｉｎ、粉体の吹き込み速度は２
５．９ｋｇ／ｍｉｎとした。吹き込み時間は１１．２分
であった。得られた結果を表１にまとめて示した。また
１本例のヒートバランスを表２に。The composition of the powder used was 62% quicklime powder - 30% limestone powder.
It is 8% fluorite crushed powder. Fluorite is added to ensure the fluidity of the slag. The gaseous oxygen supply rate is 3 Nm3/win, and the powder blowing rate is 2
The speed was set at 5.9 kg/min. Blow time was 11.2 minutes. The obtained results are summarized in Table 1. Also, the heat balance of one example is shown in Table 2.
その計算に用いた熱データを表３に示した。The thermal data used in the calculation is shown in Table 3.
表１の結果に見られるように、シリコン濃度は０．９４
％から０．３２％まで低下するともに硫黄濃度は０．０
６１％から０．００９％まで低下し、脱珪と脱硫が同時
に行われた。溶銑温度について見ると、処理開始時１４
１５℃であったものが処理後は１４０９℃になっており
、処理中の温度低下は９°Ｃと非常に少ない
表２のヒートバランスから見るかぎり１本例での理論発
熱量は温度に換算すると２７２．６°Ｃ１理論吸熱量は
温度に換算すると２０３°Ｃとなり、計算上は６９．４
°Ｃの温度上昇となる筈である０本実験例では溶銑量が
５ ｔｏｎと小規模であり、また１ヒートのみの間欠操
業のために耐火物等への抜熱量が大きいこと等の理由に
よって９℃の温度低下となったものと考えられる。実際
の製造ラインでは連続的な操業となりまた処理量もより
大きくなることから、このような熱放散は少なくなって
表２に示した計算値６９．６℃に近い温度上昇が起こる
であろうと考えられる。As seen in the results in Table 1, the silicon concentration is 0.94
% to 0.32% and the sulfur concentration was 0.0
The content decreased from 61% to 0.009%, and desiliconization and desulfurization were performed simultaneously. Looking at the hot metal temperature, at the start of treatment 14
What was 15℃ became 1409℃ after treatment, and the temperature drop during treatment was 9℃, which is very small.As far as we can see from the heat balance in Table 2, the theoretical calorific value in this example is converted to temperature. Then, the theoretical endothermic amount of 272.6°C1 becomes 203°C when converted to temperature, which is calculated as 69.4°C.
In this example, the amount of hot metal was small at 5 tons, and because of the intermittent operation with only one heat, the amount of heat removed from the refractories was large. It is thought that the temperature decreased by 9°C. Since actual production lines operate continuously and have a larger throughput, it is thought that such heat dissipation will be reduced and a temperature rise close to the calculated value of 69.6°C shown in Table 2 will occur. It will be done.
なお１表１に示すごとく本処理においてクロム濃度にほ
とんど変化はなく、クロムの酸化ロスは認められなかっ
た。またスラグ中の（％Ｔ、Ｆｅ）も２％であり本発明
者らが狙ったとおりの低いレベルになっている。引続き
さらにスラグ中の（％Ｆｅｄ）を低下させて脱硫を促進
させようとすれば、窒素などの不活性ガスのみのバブリ
ングによるいわゆるリンシングを行い、さらに（％Ｆｅ
ｄ）を低下させることも有利である。As shown in Table 1, there was almost no change in the chromium concentration in this treatment, and no chromium oxidation loss was observed. Furthermore, (%T, Fe) in the slag was 2%, which is the low level that the inventors aimed for. In order to further reduce (%Fe
It is also advantageous to reduce d).
次に９本発明を実施する際の生石灰１石灰石および気体
酸素の必要原単位の好ましい決定方法について説明する
。与えられた溶銑の成分値と温度に対し、必要とする処
理後シリコン濃度、硫黄濃度および処理後温度から、こ
れら吹き込み剤の原単位を次のようにして求めることが
できる。Next, a preferred method for determining the required unit consumption of quicklime, limestone and gaseous oxygen when carrying out the present invention will be described. For a given hot metal component value and temperature, the basic unit of these blowing agents can be determined from the required post-treatment silicon concentration, sulfur concentration, and post-treatment temperature as follows.
まず、必要Ｏ３原単位（Ｎｍ３／１ｏｎ）は、脱珪必要
量（Δ〔％５ｔ））から脱珪の酸素効率η、５．を考慮
して（１）式より求められる。First, the required O3 basic unit (Nm3/1on) is calculated from the required amount of desiliconization (Δ[%5t)), the oxygen efficiency of desiliconization η, 5. It is obtained from equation (1) taking into account.
Ｏｚ（Ｎｍ３／１ｏｎ） ＝Δ〔％Ｓｉ） Ｘ８．Ｏ／
η。１・ （１）
ここで脱珪の酸素効率ηｆｓｉｌは本発明法の場合０．
６であることが確認された。これ以外の酸素は脱炭に消
費されることになる。このη１８．．を用いて発生する
熱量（Ｓｉ、Ｃの燃焼熱）および生成するＳ ｉ Ｏｚ
量（ｋｇ／ ｔｏｎ）が求められる。Oz (Nm3/1on) =Δ[%Si) X8. O/
η. 1. (1) Here, the oxygen efficiency ηfsil for desiliconization is 0.
It was confirmed that it was 6. Other oxygen will be consumed for decarburization. This η18. ．． The amount of heat generated using (heat of combustion of Si, C) and the generated S i Oz
The amount (kg/ton) is determined.
次に、必要な脱硫率に応して塩基度（ＣａＯ／５ｉＯｚ
）を決める。通常は塩基度＝２〜３の値を処理前後の〔
％Ｓ〕に応じて決定する。必要ＣａＯ量（ｋｇ／ ｔｏ
ｎ）は２発生Ｓ ｉ Ｏ！量（ｋｇ／ ｔｏｎ）と塩基
度から（２）式より決まる。Next, the basicity (CaO/5iOz
). Normally, basicity = 2 to 3 values before and after treatment [
%S]. Required amount of CaO (kg/to
n) is 2 occurrence S i O! It is determined from formula (2) based on the amount (kg/ton) and basicity.
Ｃａ Ｏ（ｋｇ／ ｔｏｎ） ＝発生Ｓｉｎ、量Ｘ（Ｃ
ａＯ／５ｉＯｚ）・（２）
また、希望する処理後温度と反応による発生熱量・吹き
込み剤の吸熱量から１表３に示した熱データを用いて石
灰石の使用量が決められる。そして、必要ＣａＯ量（ｋ
ｇ／１ｏｎ）に不足のＣａＯ分は生石灰を用いて（３）
式で与えられる。Ca O (kg/ton) = generated Sin, amount X (C
aO/5iOz) (2) Furthermore, the amount of limestone to be used is determined from the desired post-treatment temperature, the amount of heat generated by the reaction, and the amount of heat absorbed by the blowing agent using the thermal data shown in Table 1. Then, the required amount of CaO (k
g/1on), use quicklime to compensate for the CaO content (3)
It is given by Eq.
生石灰（ｋｇ／１ｏｎ） ＝必要ＣａＯ−石灰石Ｘ０．
５６・ （３）
以上のようにして目的とする脱珪、脱硫および温度変化
に対応する生石灰１石灰石および気体酸素の原単位が決
定され、意図する脱珪脱硫の同時処理が合理的に行なえ
る。第２図にはこれらの手順を図解して示した。Quicklime (kg/1on) = Required CaO - Limestone x0.
56. (3) As described above, the basic units of quicklime 1 limestone and gaseous oxygen corresponding to the desired desiliconization, desulfurization, and temperature change are determined, and the intended simultaneous desiliconization and desulfurization treatment can be carried out rationally. . FIG. 2 illustrates these steps.
本発明によれば、脱珪と脱硫を同時に、しかも温度低下
なしに行うことができる。特にシリコンおよび硫黄濃度
の高い溶銑の同時脱珪脱硫に有効であり、シャフト炉の
ような溶融還元炉の操業負荷を軽減することができる。According to the present invention, desiliconization and desulfurization can be performed at the same time without reducing the temperature. It is particularly effective for simultaneous desiliconization and desulfurization of hot metal with high silicon and sulfur concentrations, and can reduce the operational load of smelting reduction furnaces such as shaft furnaces.
また、温度コントロール用に安価な石灰石を用いており
、これはまた安価なＣａＯ３ともなりコスト面からも有
利である。なお１本発明の実施例ではステンレス溶銑を
対象とした場合について述べたが、普通鋼溶銑にも適用
できることはいうまでもない。In addition, inexpensive limestone is used for temperature control, which also produces inexpensive CaO3, which is advantageous from a cost standpoint. Although the embodiments of the present invention have been described with reference to stainless hot metal, it goes without saying that the present invention can also be applied to ordinary steel hot metal.
第１図は実施例に使用した精錬容器の断面図。
第２図は本発明での原単位設定方法のフローを示す図で
ある。
１・・精錬容器
インジェク
ショ
ン用のノズル。
溶銑。
測温管。
第
図FIG. 1 is a sectional view of the refining vessel used in the example. FIG. 2 is a diagram showing the flow of the basic unit setting method according to the present invention. 1. Nozzle for refining vessel injection. Hot metal. Temperature tube. Diagram
Claims (4)
を気体酸素と共にインジェクションすることを特徴とす
る溶銑の同時脱珪脱硫法。(1) A method for simultaneous desiliconization and desulfurization of hot metal, which is characterized by injecting a powdered desulfurization agent together with gaseous oxygen into hot metal containing silicon and sulfur.
０から８０重量％の範囲で含有した粉体である請求項１
に記載の溶銑の同時脱珪脱硫法。(2) Powdered desulfurization agent consists of 1 part each of limestone powder and quicklime powder.
Claim 1: The powder contains 0 to 80% by weight.
The method for simultaneous desiliconization and desulfurization of hot metal described in .
載の溶銑の同時脱珪脱硫法。(3) The method for simultaneous desiliconization and desulfurization of hot metal according to claim 1 or 2, wherein the hot metal is chromium-containing hot metal.
けられた単管ノズルを用いて行われる請求項１、２また
は３に記載の溶銑の同時脱珪脱硫法。(4) The method for simultaneous desiliconization and desulfurization of hot metal according to claim 1, 2 or 3, wherein the injection is performed using a single tube nozzle provided at the bottom or side wall of the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20480890A JPH0499112A (en) | 1990-08-01 | 1990-08-01 | Method for desiliconizing and desulfurizing molten iron at the same time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20480890A JPH0499112A (en) | 1990-08-01 | 1990-08-01 | Method for desiliconizing and desulfurizing molten iron at the same time |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0499112A true JPH0499112A (en) | 1992-03-31 |
Family
ID=16496711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20480890A Pending JPH0499112A (en) | 1990-08-01 | 1990-08-01 | Method for desiliconizing and desulfurizing molten iron at the same time |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0499112A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017031437A (en) * | 2015-07-28 | 2017-02-09 | 日新製鋼株式会社 | Desulfurization method of molten pig iron |
-
1990
- 1990-08-01 JP JP20480890A patent/JPH0499112A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017031437A (en) * | 2015-07-28 | 2017-02-09 | 日新製鋼株式会社 | Desulfurization method of molten pig iron |
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