JP2014047376A - Desulfurization method for molten pig iron - Google Patents
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 46
- 230000023556 desulfurization Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910000805 Pig iron Inorganic materials 0.000 title abstract 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 21
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 3
- 239000004571 lime Substances 0.000 claims abstract description 3
- 239000011593 sulfur Substances 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 87
- 229910052751 metal Inorganic materials 0.000 claims description 87
- 238000011282 treatment Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 22
- 238000013019 agitation Methods 0.000 abstract 1
- 238000010907 mechanical stirring Methods 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 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
- 238000003672 processing method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
Description
本発明は、溶銑の脱硫処理方法に関し、具体的には、脱硫剤と溶銑との反応効率を安定的に高めることができる溶銑の脱硫処理方法に関するものである。 The present invention relates to a hot metal desulfurization method, and more particularly to a hot metal desulfurization method capable of stably increasing the reaction efficiency between a desulfurizing agent and hot metal.
近年、高強度、高加工性、高疲労特性、高溶接性等、高機能の鋼材に対するニーズの増大に伴って、極低Ｐ、極低Ｓ鋼の比率が徐々に高まってきている。これに対応するため、それらの素材を溶製する製鋼工程には、製造コストやスラグ発生量の増大を招くことなく極低Ｐ、極低Ｓ鋼を溶製することが必要であり、そのためには、脱燐剤や脱硫剤等の精錬剤と、溶銑との反応効率を高めることが不可欠である。加えて、近年の鉄鋼需要の伸びに対応するためには、生産性の向上を図る必要があり、反応速度の向上も重要である。 In recent years, the ratio of ultra-low P and ultra-low S steels has been gradually increased with increasing needs for high-performance steel materials such as high strength, high workability, high fatigue characteristics, and high weldability. In order to cope with this, in the steelmaking process for melting those materials, it is necessary to melt extremely low P and extremely low S steel without incurring an increase in production cost and slag generation amount. It is essential to increase the reaction efficiency between the refining agent such as a dephosphorizing agent and a desulfurizing agent and the molten iron. In addition, in order to cope with the recent increase in steel demand, it is necessary to improve productivity, and it is also important to improve the reaction rate.
斯かる要求に応える技術としては、従来から、機械撹拌を用いた溶銑脱硫方法が広く実用化されている。この技術によれば、回転羽根を溶銑中に浸漬して回転させ、強撹拌することによってＳ：１０数ｍａｓｓｐｐｍ以下の低Ｓ濃度域まで、短時間で処理することが可能である。 Conventionally, hot metal desulfurization methods using mechanical stirring have been widely put into practical use as technologies that meet such requirements. According to this technique, it is possible to perform processing in a short time to a low S concentration region of S: 10 several mass ppm or less by immersing and rotating the rotary blade in the hot metal and rotating it vigorously.
ところで、ＣａＯ系の脱硫剤を用いた機械撹拌式の溶銑脱硫処理は、溶銑湯面に添加された粉状もしくは粒状脱硫剤を、撹絆羽根の回転により形成される溶銑のキャビティ（渦）中に没入し、溶銑との接触界面積を大きくすることによって、脱硫剤の反応効率を高めようとするものである。この際、溶銑は、撹拌羽根の回転により撹拌され、溶銑中の［Ｓ］が反応界面に供給されることによって、脱硫反応が進行する。通常、溶銑を収容する反応容器は断面が円形の鍋型であり、回転羽根はその容器の上方から容器内に収容された溶銑の中心に挿入される。 By the way, the mechanical stirring type hot metal desulfurization treatment using a CaO-based desulfurizing agent is performed in a molten metal cavity (vortex) formed by the rotation of the stirring blades with the powdery or granular desulfurizing agent added to the hot metal surface. It is intended to increase the reaction efficiency of the desulfurizing agent by immersing in the metal and increasing the contact interface area with the hot metal. At this time, the hot metal is stirred by the rotation of the stirring blade, and [S] in the hot metal is supplied to the reaction interface, whereby the desulfurization reaction proceeds. Usually, the reaction vessel for containing the hot metal is a pan-shaped cross section, and the rotary blade is inserted into the center of the hot metal contained in the vessel from above the vessel.
しかし、近年における極低Ｓ鋼に対する要求の高まりに対しては、上記従来技術だけでは対応することが難しくなってきている。そこで、機械撹拌式の溶銑脱硫処理方法において、脱硫剤の反応効率をさらに向上し、かつ、処理速度をより高める技術として、回転羽根のスクリュー化や回転羽根の偏心挿入、反応容器への邪魔板設置などの技術が提案されている。 However, it has become difficult to cope with the recent increase in demand for ultra-low S steel only by the conventional technology. Therefore, in the mechanical stirring type hot metal desulfurization treatment method, as a technique for further improving the reaction efficiency of the desulfurizing agent and increasing the treatment speed, screwing of the rotary blade, eccentric insertion of the rotary blade, baffle plate to the reaction vessel Techniques such as installation have been proposed.
例えば、特許文献１には、溶銑を収容した反応容器底部の内面形状を、容器の中心軸に対して軸対称とはならないように底部に施工する耐火物の厚みに変化を持たせることによって、回転羽根が回転中に形成されるキャビティ（渦）を偏心させ、溶銑中への脱硫剤の巻込みを促進する技術が開示されている。また、特許文献２には、回転羽根の挿入位置を容器の中心から偏心させることによって、同様にキャビティを偏心させ、さらに形成されたキャビティに専用ランスから粉状脱硫剤をキャリアガスとともに吹付けることによって、高い脱硫剤の反応効率を実現する技術が開示されている。また、非特許文献１には、回転羽根を、捻れを加えたスクリュー型形状とし、撹拌・混合を促進する技術が開示されている。
For example, in Patent Document 1, by changing the thickness of the refractory to be applied to the bottom so that the inner surface shape of the reaction vessel containing the hot metal is not axially symmetric with respect to the central axis of the vessel, A technique is disclosed in which a cavity (vortex) formed during rotation of a rotary blade is eccentric, and the entrainment of a desulfurizing agent into hot metal is promoted. Further, in
しかしながら、特許文献１に開示の方法は、容器底部に耐火物の高低差によって設けた高低差が耐火物の損耗によって小さくなり、その効果を長期に亘って維持できないという問題がある。また、高低差を長期間維持するために底部耐火物を厚くすると、溶銑の収容能力が低下してしまう。特に、溶銑容器に冷鉄源を前装入する場合には、底部耐火物の損耗が激しいため、この問題は大きい。また、特許文献２に開示の方法は、反応容器と回転羽根との位置調整が難しく、安定した効果が得られないという問題がある。また、挿入位置がずれた場合には、再処理が必要となるため、溶銑温度の低下や生産性の低下を招くおそれがある。また、非特許文献１に開示のスクリュー型の回転羽根を用いる場合、耐火物製の羽根の寿命が短いという問題がある。
そのため、上記従来技術を適用した場合には、脱硫剤の反応効率向上効果を安定的に享受することができないという問題があった。
However, the method disclosed in Patent Document 1 has a problem that the height difference provided by the height difference of the refractory on the bottom of the container becomes small due to wear of the refractory, and the effect cannot be maintained for a long time. Moreover, if the bottom refractory is made thick in order to maintain the height difference for a long period of time, the hot metal storage capacity will be reduced. In particular, when the cold iron source is pre-charged into the hot metal container, this problem is serious because the refractory material at the bottom is very worn. Moreover, the method disclosed in
Therefore, when the above-described conventional technology is applied, there is a problem that the effect of improving the reaction efficiency of the desulfurizing agent cannot be enjoyed stably.
本発明は、従来技術が抱える上記問題点に鑑みてなされたものであり、その目的は、脱硫剤と溶銑との反応効率を安定的に高めることができる溶銑の脱硫処理方法を提案することにある。 The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to propose a hot metal desulfurization treatment method capable of stably increasing the reaction efficiency between the desulfurizing agent and hot metal. is there.
発明者らは、従来技術が抱える上記問題点を解決するべく鋭意検討を重ねた。その結果、機械撹拌式の溶銑脱硫方法において、溶銑を収容した容器を傾倒させてやることによって、溶銑に形成されるキャビティを偏心させ、脱硫剤と溶銑との反応効率を安定的に高めることができることを見出し、本発明を開発するに至った。 The inventors have intensively studied to solve the above-described problems of the prior art. As a result, in the mechanical stirring type hot metal desulfurization method, by tilting the container containing the hot metal, the cavity formed in the hot metal can be decentered and the reaction efficiency between the desulfurizing agent and the hot metal can be stably increased. The inventors have found that this is possible and have developed the present invention.
すなわち、本発明は、溶銑中に撹拌羽根を浸漬し、回転して撹拌しながら、石灰を主成分とする脱硫剤を添加して溶銑の硫黄濃度を低減する溶銑の脱硫処理方法において、
前記溶銑の撹拌を、溶銑が流出しない範囲で、溶銑を収容した容器を傾倒させて行うことを特徴とする溶銑の脱硫処理方法を提案する。
That is, the present invention is a desulfurization treatment method for hot metal in which a stirring blade is immersed in hot metal, and while rotating and stirring, a desulfurization agent mainly composed of lime is added to reduce the sulfur concentration of the hot metal,
A hot metal desulfurization method is proposed in which the hot metal is stirred by tilting a container containing hot metal within a range in which the hot metal does not flow out.
本発明の溶銑の脱硫処理方法は、上記溶銑を収容した容器を傾倒させる角度αを、１．０度以上とすることを特徴とする。 The hot metal desulfurization processing method of the present invention is characterized in that the angle α for tilting the container containing the hot metal is set to 1.0 ° or more.
本発明によれば、機械撹拌式の溶銑脱硫処理において、溶銑を収容した容器を傾倒させ、回転羽根によって形成されるキャビティを偏心させることによって、脱硫剤の巻き込みを促進することができるので、脱硫剤の反応効率を安定的に高めることが可能となる。したがって、本発明によれば、極低Ｓの鋼を生産性よく製造することができる。 According to the present invention, in the mechanical stirring type hot metal desulfurization treatment, it is possible to promote the entrainment of the desulfurizing agent by tilting the container containing the hot metal and decentering the cavity formed by the rotating blades. The reaction efficiency of the agent can be stably increased. Therefore, according to the present invention, extremely low S steel can be produced with high productivity.
発明者らは、機械撹拌式の溶銑脱硫処理において、溶銑と脱硫剤との反応効率を高める方法について検討を重ねた結果、溶銑を収容した容器を傾倒することによって回転羽根によって形成されるキャビティが偏心し、脱硫剤の反応効率を高めることができるのではないかと考えた。 The inventors of the present invention have studied the method of increasing the reaction efficiency between the hot metal and the desulfurizing agent in the mechanical stirring type hot metal desulfurization treatment, and as a result, the cavity formed by the rotating blades is tilted by tilting the container containing the hot metal. Eccentric and thought that the reaction efficiency of the desulfurization agent could be improved.
図１は、本実験に用いた機械撹拌式の溶銑脱硫装置の概要を示した模式図であり、図１（ａ）は、輸送台車の上に積載した溶銑を収容した鍋（以降、「溶銑鍋」ともいう。）に対して、その上方から回転羽根を溶銑中に挿入した状態を表わしたものであり、また、図２（ｂ）は、上記溶銑鍋の傾倒角α（容器の軸心からの傾き角）と、溶銑中に挿入した回転羽根を回転させたときの溶銑湯面が盛り上がり高さΔＨを説明したものである。また、表１には、図１に示した機械撹拌式溶銑脱硫装置の仕様と、その脱硫装置を用いた脱硫処理条件を示した。 FIG. 1 is a schematic view showing an outline of a mechanical stirring type hot metal desulfurization apparatus used in this experiment. FIG. 1 (a) shows a pan (hereinafter referred to as “hot metal” containing hot metal loaded on a transport carriage. 2), the rotating blades are inserted into the hot metal from above, and FIG. 2 (b) shows the tilt angle α of the hot metal pan (the axis of the container). And the hot metal surface when the rotating blade inserted in the hot metal is rotated explains the height ΔH. Table 1 shows the specifications of the mechanical stirring type hot metal desulfurization apparatus shown in FIG. 1 and the desulfurization treatment conditions using the desulfurization apparatus.
ここで、溶銑鍋中で回転羽根を回転させたときの溶銑湯面の盛り上がり高さΔＨ（ｍ）は、技術文献（永田進治著：「化学装置設計・操作シリーズＮｏ．１ 改定撹拌装置」：化学工業社、Ｓ５４，ｐ．６４−６５）によれば、下記の（１）〜（４）式で求めることができる。
ここで、Ｄ：溶銑鍋径（ｍ）、ｄ：回転羽根径（ｍ）、ｎｐ：羽根枚数（−）、Ｎ：回転数（ｒｐｍ）、ρ：溶銑密度（＝７２００（ｋｇ／ｍ３）、μ：溶銑の動粘性係数（＝６．５×１０３（Ｐａ・ｓ）、ｒｃ：中心円柱状回転部（回転羽根）半径（ｍ）、ｙ：中心円柱状回転部（回転羽根）の容器径に対する割合（−）、ｇ：重力加速度（＝９．８ｍ２／ｓ）、ｂ：回転羽根高さ（ｍ）、ｎ：回転数（１／ｓ）である。
Here, the rising height ΔH (m) of the hot metal surface when the rotating blades are rotated in the hot metal ladle is technical literature (Shinji Nagata: “Chemical equipment design / operation series No. 1 revised stirring equipment”) : Chemical industry, S54, p.64-65), it can be obtained by the following formulas (1) to (4).
Here, D: Hot metal ladle diameter (m), d: Rotary blade diameter (m), n p : Number of blades (−), N: Number of rotations (rpm), ρ: Hot metal density (= 7200 (kg / m 3) ), Μ: Kinematic viscosity coefficient of molten iron (= 6.5 × 10 3 (Pa · s), r c : radius of central cylindrical rotating part (rotating blade) (m), y: central cylindrical rotating part (rotating blade) ) With respect to the container diameter (−), g: gravitational acceleration (= 9.8 m 2 / s), b: rotary blade height (m), n: rotational speed (1 / s).
表１に示した設備仕様および撹拌条件を代入した場合の溶銑湯面の盛り上がり高さΔＨは、上記（１）〜（４）式から、約０．３１ｍと推定される。ここで、溶銑鍋を溶銑鍋ｔ中心線から５度傾倒させたときには、見かけ上、溶銑湯面は傾倒させた側に最大でＤ・ｔａｎα上昇する。例えば、表１の場合、傾倒角が５度の場合、Ｄ・ｔａｎα＝０．３５ｍｍとなる。したがって、溶銑鍋を５度傾倒させて回転羽根を表１の条件で回転させた場合の、見かけ上の湯面の盛り上がり高さΔＨは０．６６ｍとなる。同様にして、傾倒角αが１０度のときの見かけ上の盛り上がり高さΔＨは１．０１となる。 From the above formulas (1) to (4), it is estimated that the rising height ΔH of the hot metal surface when the equipment specifications and stirring conditions shown in Table 1 are substituted is about 0.31 m. Here, when the hot metal pan is tilted 5 degrees from the center line of the hot metal pan t, apparently, the hot metal surface rises by a maximum of D · tan α to the tilted side. For example, in the case of Table 1, when the tilt angle is 5 degrees, D · tan α = 0.35 mm. Therefore, when the hot metal pan is tilted by 5 degrees and the rotary blade is rotated under the conditions shown in Table 1, the apparent rise height ΔH of the hot water surface is 0.66 m. Similarly, the apparent rising height ΔH when the tilt angle α is 10 degrees is 1.01.
通常、溶銑脱硫操業に用いられる溶銑鍋におけるフリーボード高さ（溶銑鍋を傾倒させない状態における湯面から鍋上端までの高さ）は１．１〜１．２ｍであるので、傾倒角αが１０°までの範囲であれば溶銑の流出は起きないことが推定される。そこで、表１に示した設備仕様および撹拌条件において、溶銑鍋の傾倒角αを０〜１０度の範囲内で種々に変更して脱硫処理を行い、その際の脱硫率の変化を調査した。なお、上記脱硫率は、下記式；
脱硫率（％）＝（処理前［ｍａｓｓ％Ｓ］−処理後［ｍａｓｓ％Ｓ］）／処理前［ｍａｓｓ％Ｓ］
で定義され、同一の脱硫剤原単位、即ち、単位溶銑トン当たりの脱硫剤の投入量が同じ条件においては、脱硫率が高いほど脱硫剤と溶銑との反応効率が高いことを意味する。
Usually, the freeboard height in the hot metal ladle used in the hot metal desulfurization operation (height from the hot water surface to the upper end of the pan when the hot metal pan is not tilted) is 1.1 to 1.2 m, so the tilt angle α is 10 It is estimated that hot metal does not flow out in the range up to ° C. Therefore, in the equipment specifications and stirring conditions shown in Table 1, desulfurization treatment was performed by changing the tilt angle α of the hot metal ladle within a range of 0 to 10 degrees, and changes in the desulfurization rate at that time were investigated. In addition, the said desulfurization rate is the following formula;
Desulfurization rate (%) = (before treatment [mass% S] −after treatment [mass% S]) / before treatment [mass% S]
This means that the higher the desulfurization rate, the higher the reaction efficiency between the desulfurizing agent and the hot metal under the same desulfurizing agent basic unit, that is, the same amount of desulfurizing agent input per ton of molten iron.
図２は、溶銑鍋の傾倒角と脱硫率との関係を示したものである。この図から、傾倒角αが大きくなるのに伴い、脱硫剤の反応効率が向上し、３度以上で脱硫率を９０％以上、６度以上で脱硫率を９５％以上にできることがわかる。なお、処理中に形成されるキャビティの目視観察からも、傾倒角αが大きくなると、撹拌羽根の周囲に形成されるキャビティが中心より偏心し、添加された脱硫剤の溶銑中への巻込みが促進していることが確認された。それと同時に、傾倒角αの増加に伴い、撹拌羽根の回転数を一定に維持するためのモータ負荷は大きくなる傾向が認められた。これは、キャビティが偏心し、脱硫剤の巻込みを促進するために必要な動力が増加したためと考えられる。
上記図２の結果から、本発明では、溶銑を収容した容器の傾倒角αを好ましくは１．０度以上、より好ましくは２．５度以上とする。また、傾倒角αの上限は、容器の傾動時に溶銑が流出しなければ大きいほど好ましいが、１０度を超えると、図２からわかるように、脱硫効果も飽和するようになるので、上限は１０度程度とする。
FIG. 2 shows the relationship between the tilt angle of the hot metal ladle and the desulfurization rate. From this figure, it can be seen that as the tilt angle α increases, the reaction efficiency of the desulfurizing agent improves, and the desulfurization rate can be 90% or more at 3 ° or more, and the desulfurization rate can be 95% or more at 6 ° or more. In addition, also from the visual observation of the cavities formed during the treatment, when the tilt angle α increases, the cavities formed around the stirring blades are decentered from the center, and the added desulfurizing agent is caught in the hot metal. It was confirmed that it was promoting. At the same time, as the tilt angle α increased, the motor load for keeping the rotation speed of the stirring blade constant was observed to increase. This is presumably because the cavities are decentered and the power required to promote the desulfurization agent is increased.
From the results shown in FIG. 2, in the present invention, the tilt angle α of the container containing the molten iron is preferably 1.0 degree or more, more preferably 2.5 degrees or more. Further, the upper limit of the tilt angle α is preferably as long as the hot metal does not flow out when the container is tilted. However, if it exceeds 10 degrees, the desulfurization effect becomes saturated as can be seen from FIG. About degrees.
上記基礎実験の結果に基き、傾倒角αを５度とし、他の処理条件は表１の通りとした条件で、処理数を拡大して工程的な実験を行った。
表２は、上記工程実験の結果を、溶銑鍋を傾倒させない（傾倒角α＝０度）と比較して示したものである。溶銑装入鍋を傾倒した場合には、従来の溶銑装入鍋を傾倒しない（傾倒角０°）の場合に比較して、脱硫率の平均値は大幅に向上している。
Based on the results of the basic experiment, a stepwise experiment was performed with the tilt angle α set to 5 degrees and the other processing conditions as shown in Table 1, with the number of treatments increased.
Table 2 shows the results of the above-described process experiment in comparison with not tilting the hot metal ladle (tilt angle α = 0 degree). When the hot metal charging pan is tilted, the average value of the desulfurization rate is greatly improved as compared with the case where the conventional hot metal charging pan is not tilted (
以上の結果から、本発明においては、溶銑を収容した鍋を傾倒させて機械撹拌式の脱硫処理を施す場合には、溶銑が容器から流出しない範囲で傾倒角αを適宜調整することで、脱硫剤と溶銑との反応効率を安定的に高めることとした。 From the above results, in the present invention, when the ladle containing hot metal is tilted and subjected to mechanical stirring type desulfurization treatment, desulfurization is performed by appropriately adjusting the tilt angle α in a range in which hot metal does not flow out of the container. The reaction efficiency between the agent and the hot metal was stably increased.
図１および表１に示した機械撹拌式溶銑脱硫装置、脱硫処理条件で、溶銑鍋を傾倒させない従来の条件（比較例）と、傾倒角αを１度、５度および１０度の３水準に変化させた条件（発明例１〜３）の合計４条件において、各百数十チャージの溶銑脱硫処理実験を行い、脱硫処理前後のＳ濃度を測定し、その結果を表３にまとめて示した。 In the mechanical stirring type hot metal desulfurization apparatus shown in FIG. 1 and Table 1, the conventional conditions (comparative example) in which the hot metal ladle is not tilted, and the tilt angle α are set to three levels of 1 degree, 5 degrees and 10 degrees. Under a total of four conditions (Invention Examples 1 to 3) changed, hot metal desulfurization treatment experiments with hundreds of tens of charges were performed, S concentrations before and after the desulfurization treatment were measured, and the results are summarized in Table 3. .
表３から、溶銑を収容した容器を傾倒する本発明を適用することにより、脱硫率を大幅に向上することができ、その結果、Ｓ≦０．００１０ｍａｓｓ％の極低Ｓ鋼を安定して製造できることがわかる。 From Table 3, the desulfurization rate can be greatly improved by applying the present invention for tilting the container containing the hot metal, and as a result, S ≦ 0.0010 mass% of extremely low S steel can be produced stably. I understand that I can do it.
本発明の技術は、液体中に固体を分散・混合する撹拌装置にも適用することができる。 The technology of the present invention can also be applied to a stirring device that disperses and mixes solids in a liquid.
Claims (2)
前記溶銑の撹拌を、溶銑が流出しない範囲で、溶銑を収容した容器を傾倒させて行うことを特徴とする溶銑の脱硫処理方法。 In the hot metal desulfurization method of adding a desulfurizing agent mainly composed of lime to reduce the sulfur concentration of the hot metal while immersing the stirring blade in the hot metal and rotating and stirring,
The hot metal desulfurization treatment method is characterized in that the hot metal is stirred by tilting the container containing the hot metal within a range in which the hot metal does not flow out.
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| KR20160028780A (en) | 2014-09-04 | 2016-03-14 | 주식회사 포스코 | Container and the Processing apparatus for molten metal having it |
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