KR20030097537A - Method for desulfurization of molten steel having slag of high oxygen potential - Google Patents
Method for desulfurization of molten steel having slag of high oxygen potential Download PDFInfo
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Abstract
본 발명은 산소포텐셜이 높은 슬래그를 가진 용선의 탈황처리 방법에 관한 것으로서, 석회계 탈황제를 80∼120㎏/분의 속도로 취입하고 랜스 침적깊이비는 0.35∼0.45로 유지하는 단계; 석회계 탈황제와 탄산나트륨 소오다회 각각을 50∼70㎏/분의 속도로 취입하여 후혼합하고 랜스 침적깊이비는 0.75∼0.85로 유지하는 단계; 및 탄산나트륨 소오다회를 50∼70㎏/분의 속도로 취입하고 랜스 침적깊이비는 0.85∼0.95로 유지하는 단계를 포함하여 이루어짐을 특징으로 하며, 이러한 방법에 의해 산소포텐셜이 높은 슬래그의 영향을 받지 않고 용선 중 황의 제거효율을 높여 일련의 제강공정에서 용강의 청정성을 높일 수 있다.The present invention relates to a method for desulfurization of molten iron having a high slag of oxygen potential, comprising: blowing lime-based desulfurizing agent at a rate of 80 to 120 kg / min and maintaining a lance deposition depth ratio of 0.35 to 0.45; Blowing each of the lime-based desulfurizing agent and sodium carbonate soda ash at a rate of 50 to 70 kg / min to post-mix and maintain the lance deposition depth ratio at 0.75 to 0.85; And injecting sodium carbonate soda ash at a rate of 50 to 70 kg / min and maintaining the lance deposition depth ratio at 0.85 to 0.95. In this way, the effect of slag with high oxygen potential is affected. It can improve the cleanliness of molten steel in a series of steelmaking processes by increasing the removal efficiency of sulfur in molten iron.
Description
본 발명은 산소포텐셜이 높은 슬래그를 가진 용선의 탈황처리 방법에 관한 것으로, 더욱 상세하게는, 용선예비처리 전에 산화철을 사용한 탈규처리로 인해 산소포텐셜이 높은 슬래그를 가진 용선을 탈황처리하는데 있어서, 탈황반응 구간별 취입하는 탈황제를 달리하고 이의 취입속도 또한 달리함으로써, 산소포텐셜이 높은 슬래그의 영향을 받지 않고 용선 중 황의 제거효율을 높여 일련의 제강공정에서 용강의 청정성을 높일 수 있는 산소포텐셜이 높은 슬래그를 가진 용선의 탈황처리 방법에 관한 것이다.The present invention relates to a method for desulfurization of molten iron having a high oxygen potential slag, and more particularly, in the desulfurization treatment of molten iron having a high oxygen potential due to the desulfurization treatment using iron oxide before the molten iron preliminary treatment. By varying the desulfurization agent blown by reaction section and the blowing speed, the slag with high oxygen potential to improve the cleanliness of molten steel in a series of steelmaking processes by increasing the removal efficiency of sulfur in molten iron without being affected by slag with high oxygen potential. It relates to a desulfurization treatment method of molten iron having a.
일반적으로, 고로에서 생산된 용선을 대상으로 하는 탈황방법 중 가장 널리 사용되는 방법은 용선에 생석회계 탈황제, 칼슘카바이드계 탈황제 또는 탄산나트륨을 괴상태나 분체 상태로 투입하여 용선중의 황과 결합시켜 슬래그로 제거하는 방법으로서, 이때 용선중에서의 반응식은 다음과 같이 나타내어진다.In general, the most widely used desulfurization method for the molten iron produced in the blast furnace is slag by adding a quicklime desulfurizing agent, calcium carbide desulfurizing agent or sodium carbonate in the form of a lump or powder in combination with the sulfur in the molten iron slag In this case, the reaction formula in the molten iron is represented as follows.
탈황제의 종류와 괴상 또는 분상의 선택조건은 용선에 교반력을 부여하는 장치 즉, 탈황제를 용선에 투입하는 방법에 따라 다르고, 후공정에서 요구하는 황의 농도에 따라서도 다르다.The type of desulfurization agent and the selection conditions of the bulk or powder phase depend on the apparatus for imparting agitation force to the molten iron, that is, the method of adding the desulfurization agent to the molten iron, and also depends on the concentration of sulfur required in the post process.
일반적으로, 종래의 용선 중 탈황방법에서는 용선에 교반력을 부여하는 장치로서 임펠러를 용선안으로 넣어 회전시키는 KR(kanvara reactor)식이 이용되어 왔다. 이는 괴상의 탈황제를 상부에서 투입하는 방법으로, 교반력 자체는 커서 반응효율은 뛰어나지만 별도의 처리용기가 필요하다는 점과 설비의 유지 보수비용이 많이 소요되는 단점이 있다.In general, in the conventional desulfurization method of molten iron, KR (kanvara reactor) formula that rotates the impeller into the molten iron as a device for imparting agitation force to the molten iron. This is a method of injecting the bulk desulfurization agent from the top, the stirring force itself is large, the reaction efficiency is excellent, but there is a disadvantage that a separate treatment container is required and the maintenance cost of the facility is high.
또 다른 방법으로서 랜스(lance)를 통하여 질소나 공기와 같은 기체로 교반력을 부여하는 방법이 이용되어 왔는데, 이러한 방식에서는 분상태의 탈황제를 사용해 용선 중에 함유된 황을 제거하는 방법이 이용되었다. 그러나, 이러한 방식은 용선 운반용기에서 처리한다는 장점은 있으나, 용선안에서 교반력이 약하여 반응효율은 상대적으로 KR방식보다 떨어지는 문제점이 있다.As another method, a method of imparting agitation force with a gas such as nitrogen or air through a lance has been used. In this method, a method of removing sulfur contained in molten iron using a powdered desulfurization agent has been used. However, this method has the advantage that it is treated in the molten iron vessel, there is a problem that the reaction efficiency is relatively lower than the KR method because the stirring force is weak in the molten iron.
이하, 종래기술의 문제점에 대해서 보다 상세하게 설명을 한다.Hereinafter, the problem of the prior art will be described in more detail.
종래기술의 탈황방법은 각각의 탈황제가 반응하는 특성도 달라 이들 중 석회계 탈황제와 칼슘카바이드 탈황제는 탄산나트륨에 비하여 저렴하여 널리 사용되고 있으며, 반응특성은 환원반응으로 온도가 높고 슬래그의 염기도가 높을수록 탈황반응이 잘 일어나며, 특히 탈황효율이 용선 및 슬래그의 산소포텐셜과 슬래그의 염기도에 의해 크게 영향을 받기 때문에, 고로에서 탈규처리를 한 용선일 경우는 탈황효율이 매우 나빠진다. 이 경우 통상적인 수준의 탈황율을 얻기 위해서 탈황제의 소요량이 과다하게 증가하고 처리시간이 길어져 후공정에 용선을 제때 공급하지 못해 생산성이 저하되는 문제점을 야기할 수 있다.The desulfurization method of the prior art also has the characteristics that each desulfurization agent reacts among them, lime-based desulfurization agent and calcium carbide desulfurization agent is widely used inexpensive compared to sodium carbonate. The reaction occurs well, and the desulfurization efficiency is very poor in the case of molten iron subjected to de-silification in the blast furnace because the desulfurization efficiency is greatly affected by the molten iron and the oxygen potential of the slag and the basicity of the slag. In this case, the amount of desulfurization agent is excessively increased in order to obtain the normal level of desulfurization rate, and the processing time is long, which may cause a problem that productivity cannot be reduced due to the inability to supply molten iron to the post-process on time.
한편, 탄산나트륨은 용선온도와 슬래그의 산소포텐셜 및 슬래그의 염기도에 의한 영향도는 크지 않으나, 하기의 반응식 4 내지 6에서 보는 바와 같이 투입된탄산나트륨이 [S]성분 외에 용선 중 [C] 또는 [P]성분에 사용되어져 탈황효율이 급격하게 저하하는 문제점이 있어 탈인처리가 완료된 용선에만 적용해야 하는 문제점이 있다. 또한, 나트륨의 기화 증발온도가 낮아 하기 반응식 4와 같이 기화하여 손실되는 양은 투입된 양의 30% 수준으로 알려져 있으며, 투입되는 속도가 커질수록 그 손실율은 커지기 때문에 경제성이 떨어지게 되는 또다른 문제점이 있다.On the other hand, sodium carbonate is not affected by the molten iron temperature, the oxygen potential of the slag and the basicity of the slag, but sodium carbonate added as shown in the reaction schemes 4 to 6 in addition to the [S] component in the molten iron [C] or [P] There is a problem that the desulfurization efficiency is drastically reduced because it is used in the component, and there is a problem that should be applied only to the molten iron which has been dephosphorized. In addition, since the evaporation temperature of sodium is lowered by the evaporation temperature as shown in Scheme 4 below, the amount lost by vaporization is known as 30% of the injected amount.
이에, 본 발명은 상기와 같은 문제점을 더욱 효율적으로 해결하기 위하여 제공된 것으로서, 그 목적은 탈황처리를 실시하기 전에 산화철을 이용하여 탈규작업을 하여 슬래그의 산소포텐셜이 높아졌고 염기도가 낮아져 종래의 방법으로 탈황처리가 곤란한 용선조건에서도 탈황효율이 우수하여 일련의 제강공정에서 용강의 청정성을 높일 수 있는 용선의 탈황처리 방법을 제공하고자 하는 것이다.Thus, the present invention is provided to solve the above problems more efficiently, the object of the desulfurization operation using iron oxide before the desulfurization treatment to increase the oxygen potential of slag and lower the basicity in the conventional method It is to provide a method for desulfurization of molten iron which can improve the cleanliness of molten steel in a series of steelmaking processes due to excellent desulfurization efficiency even in molten iron which is difficult to desulfurize.
도 1은 용선운송용기인 토페도카에서의 탈황공정을 설명하는 개략도이다.1 is a schematic diagram illustrating a desulfurization process in a torpedo car, which is a chartered transport container.
도 2a는 일반적인 탈황처리 패턴을 나타내는 설명도이다.2A is an explanatory diagram showing a general desulfurization treatment pattern.
도 2b는 본 발명에 따른 탈황처리 패턴을 나타내는 설명도이다.2B is an explanatory diagram showing a desulfurization treatment pattern according to the present invention.
도 3은 일반적인 탈황패턴과 본 발명에 의한 탈황효과를 비교한 설명도이다.3 is an explanatory view comparing the desulfurization effect according to the present invention with a general desulfurization pattern.
* 도면의 주요부호에 대한 설명 *Explanation of the main symbols in the drawings
1a, 1b : 탈황제 저장장치(hopper)1a, 1b: Desulfurization hopper
2a, 2b : 기체로 가압하여 압력을 부여하는 장치(dispenser)2a, 2b: Dispenser to pressurize with gas to give pressure
3a, 3b : 탈황제가 반송되는 배관3a, 3b: Pipe to which desulfurization agent is returned
4: 탈황제를 용선 안으로 취입하는 랜스(injection lance)4: injection lance with blowing desulfurizer into the molten iron
5 : 용선운송용기인 토페도(torpedo)5: topedo, charter vessel
상기한 목적을 달성하기 위하여 본 발명에 따른 산소포텐셜이 높은 슬래그를가진 용선의 탈황처리 방법은 산소포텐셜이 높은 슬래그를 가진 통상의 용선 탈황처리 방법에 있어서, 석회계 탈황제를 80∼120㎏/분의 속도로 취입하고 랜스 침적깊이비는 0.35∼0.45로 유지하는 단계; 석회계 탈황제와 탄산나트륨 소오다회 각각을 50∼70㎏/분의 속도로 취입하여 후혼합하고 랜스 침적깊이비는 0.75∼0.85로 유지하는 단계; 및 탄산나트륨 소오다회를 50∼70㎏/분의 속도로 취입하고 랜스 침적깊이비는 0.85∼0.95로 유지하는 단계를 포함하여 이루어짐을 특징으로 한다.In order to achieve the above object, the method of desulfurization of molten iron having a high oxygen potential slag according to the present invention is a conventional molten iron desulfurization treatment method having a high oxygen potential slag, the lime-based desulfurizing agent is 80 ~ 120kg / min Blowing at a rate of and maintaining the lance deposition depth ratio at 0.35 to 0.45; Blowing each of the lime-based desulfurizing agent and sodium carbonate soda ash at a rate of 50 to 70 kg / min to post-mix and maintain the lance deposition depth ratio at 0.75 to 0.85; And blowing sodium carbonate soda ash at a rate of 50 to 70 kg / min and maintaining the lance deposition depth ratio at 0.85 to 0.95.
이하, 도면을 들어 본 발명에 대하여 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the drawings.
도 1은 용선운송용기인 토페도카에서의 탈황공정을 설명하는 개략도로서 호퍼(1a, 1b)에 저장된 각 탈황제는 별도의 디스펜서(2a, 2b)에 공급된 후 배관(3a, 3b)으로 반송되어 취입랜스(4) 부위에서 후혼합되게 된다.1 is a schematic view illustrating a desulfurization process in a torpedo car, a chartered transport container, wherein each desulfurization agent stored in the hoppers 1a and 1b is supplied to separate dispensers 2a and 2b and then returned to the pipes 3a and 3b. Then, the mixture is post-mixed at the blowing lance 4.
도 2a는 용선 탈황처리 작업의 일반적인 패턴을 나타낸 것이다. 취입속도는 분당 탈황제가 취입되는 양을 ㎏단위로 나타낸 것으로, 일반적인 탈황처리 패턴에서는 탈황제의 양과 처리시간을 고려하여 탈류처리 시작부터 종료까지 일정한 속도를 유지하는데, 그 이유는 취입속도를 변환시키기 위해서는 관내 탈황제와 탈황제 반송기체의 비율을 변경시키는 데 따르는 처리시간의 지연을 방지하기 위해서다. 한편, 랜스 침적깊이비는 용기내 용선의 깊이에 대한 랜스 침적깊이를 나타낸 것인데, 일례로 용선의 깊이가 2,000㎜이고, 랜스의 침적깊이가 1,000㎜일 경우 랜스 침적깊이비는 0.5로 나타낸다. 일반적인 탈황처리에서는 랜스 침적깊이를 일정하게 유지한다.Figure 2a shows a general pattern of the molten iron desulfurization operation. Blowing speed is the amount of blowing desulfurizer per minute in kg unit. In general desulfurization treatment pattern, the desulfurizing agent is maintained at a constant speed from the start of the desulfurization treatment to the end of the desulfurization treatment. This is to prevent the delay of processing time caused by changing the ratio of the desulfurization agent and the desulfurization carrier gas in the pipe. On the other hand, the lance deposition depth ratio represents the lance deposition depth to the depth of the molten iron in the container, for example, the depth of the molten iron is 2,000 mm, the lance deposition depth ratio is represented as 0.5 when the lance depth is 1,000 mm. In general desulfurization treatment, the lance deposition depth is kept constant.
도 2b는 본 발명에 의한 탈황처리 작업의 패턴을 나타낸 것이다. 탈황시작부터 종료까지의 반응특성을 3단계로 구분하여 구간별 취입패턴을 달리하였다. 1단계에서는 탈황제로서 석회계 탈황제만을 사용하고, 그 취입속도는 80∼120㎏/분으로 하며, 랜스 침적깊이비는 0.35∼0.45로 유지한다. 2단계에서는 탈황제로서 석회계 탈황제와 탄산나트륨 소오다회를 사용하며, 이들 각 탈황제의 취입속도는 50∼70㎏/분으로 하고, 랜스 침적깊이비는 0.75∼0.85로 유지한다.Figure 2b shows a pattern of the desulfurization operation according to the present invention. The blowing pattern for each section was changed by dividing the reaction characteristics from the start of desulfurization to the end in three stages. In the first stage, only the lime-based desulfurization agent is used as the desulfurization agent, the blowing speed is 80 to 120 kg / min, and the lance deposition depth ratio is maintained at 0.35 to 0.45. In the second stage, lime-based desulfurization agent and sodium carbonate soda ash are used as the desulfurization agent. The blowing rate of each desulfurization agent is 50 to 70 kg / min, and the lance deposition depth ratio is maintained at 0.75 to 0.85.
상기 1단계에서는 석회계 탈황제를 단독으로 원단위 2.0∼3.0㎏/t.p의 양으로 취입하는데, 이때 투입된 석회계 탈황제는 용선의 온도를 낮추고 슬래그의 염기도(통상적으로 슬래그에 포함되어 있는 CaO/SiO2를 나타냄)를 향상시켜 이후의 탈황반응에 적합한 조건을 조성하는 역할을 하는 것일 뿐, 본격적인 탈황반응은 일어나지 않는다. 한편, 취입속도는 탈류처리 시간의 단축과 조업시 설비 및 작업자의 안정성을 고려하여 조절되어야 하는 것으로, 취입속도가 클수록 전체적인 처리시간을 단축할 수 있어서 좋으나, 120㎏/분을 초과할 경우 용기내의 교반력이 너무 커져서 스플래시(splash; 용기입구로 용선과 슬래그가 튀어 오르는 현상)가 발생하기 쉬우므로, 취입속도는 분당 80∼120㎏/분으로 제한하는 것이 바람직하다. 한편, 랜스 침적깊이비는 낮게 유지할 경우 투입된 석회계 탈황제가 슬래그층에 도달시간을 짧게 하는 것이 가능하여 슬래그의 염기도를 향상시키는 속도를 빨리함은 물론 스플래시(splash) 발생을 방지할 수 있으므로, 0.35∼0.45로 유지하는 것이 바람직하다.In the first step, the lime-based desulfurization agent alone is blown in an amount of 2.0 to 3.0 kg / tp per unit unit, and the lime-based desulfurizing agent lowers the temperature of the molten iron and changes the basicity of the slag (usually CaO / SiO 2 contained in the slag). It only serves to create a condition suitable for the subsequent desulfurization reaction, it does not occur in earnest desulfurization reaction. On the other hand, the blowing speed should be adjusted in consideration of the shortening of the dewatering treatment time and the stability of equipment and workers during operation, and the larger the blowing speed can be shortened the overall treatment time, but if it exceeds 120kg / min Since the agitation force becomes so large that splashing (protrusion of molten iron and slag into the container entrance) easily occurs, the blowing speed is preferably limited to 80 to 120 kg / min. On the other hand, if the lance deposition depth ratio is kept low, the lime-based desulfurization agent can shorten the time to reach the slag layer, thereby improving the basicity of the slag and preventing the occurrence of splash. It is preferable to keep it at -0.45.
2단계에서는 탈황제로서 석회계 탈황제와 탄산나트륨 소오다회를 동시에 취입하는데, 취입방법으로서는 상기 두 종류의 탈황제가 각각의 저장용기인 호퍼와 공급장치인 디스펜서에서 나오고, 가압되어 별도의 배관으로 반송되어져 취입랜스 부위에서 혼합되는 후혼합방식(post mix method)을 이용할 수 있다. 이때 투입된 석회계 탈황제는 탈황반응뿐만 아니라 슬래그의 염기도 증가 및 슬래그 층을 두껍게 만들어 탄산나트륨 소오다회에서 기화된 나트륨증기가 슬래그 층을 쉽게 빠져 나가지 못하도록 하여 탈황효율을 증대시키는 효과가 있다. 이러한 2단계에서부터 탈류반응이 본격적으로 일어나므로 이 단계에서의 취입속도 조정은 매우 중요하게 된다. 투입된 석회계 탈황제와 탄산나트륨 소오다회는 노즐부위에서 용선으로 취입되는 순간부터 슬래그층으로 부상하는 동안에 [S]성분과 결합하는 동적반응(transitory reaction)에 의존도가 크기 때문에 취입속도를 너무 크게 할 경우 용선중에 체류하는 시간이 짧아져 탈류효율이 저하되며, 이에 반하여 취입속도를 너무 작게 할 경우 디스펜서의 밸브 콘트롤이 어렵게 되어 일정한 취입속도를 유지할 수가 없고, 랜스내 반송용 기체와 탈황제의 공급이 순간적으로 끊기는 맥동현상에 의해 랜스의 선단부로 용선이 침입하여 랜스에 막힘현상이 발생하게 되어 탈류작업 자체가 불가능한 경우가 발생할 염려가 있으므로, 상기 탈황제 각각의 취입속도는 50∼70㎏/분으로 제한하는 것이 바람직하다. 또한, 체류시간을 길게 유지하기 위하여 랜스 침적깊이비는 0.75∼0.85로 유지하는 것이 바람직하다.In the second stage, lime-based desulfurizing agent and sodium carbonate soda ash are simultaneously blown as a desulfurizing agent.As a blowing method, the two kinds of desulfurizing agents are discharged from the hopper and the dispenser, which are storage containers, and pressurized and returned to a separate pipe. It is possible to use a post mix method of mixing at the lance site. At this time, the lime-based desulfurization agent has an effect of increasing the desulfurization efficiency by increasing the basicity of slag and thickening the slag layer as well as the desulfurization reaction so that sodium vaporized in sodium carbonate does not easily escape the slag layer. Since the deflow reaction takes place in earnest from these two stages, it is very important to adjust the blowing rate in this stage. The added lime-based desulfurizing agent and sodium carbonate soda ash are too dependent on the transitory reaction that combines with the [S] component from the moment of blowing into the slag layer from the moment of blowing into the molten iron in the nozzle area, so the blowing rate is too high. As the time to stay in the molten iron is shortened, the degassing efficiency is lowered. On the other hand, if the blowing speed is too small, the valve control of the dispenser becomes difficult to maintain a constant blowing speed. There is a possibility that the molten iron penetrates into the front end of the lance due to the pulsating rupture, which may cause clogging in the lance and make it impossible to perform the desulfurization operation itself. desirable. In addition, in order to keep the residence time long, it is preferable to keep the lance deposition depth ratio at 0.75 to 0.85.
한편, 3단계는 탈황반응이 최고조에 달하는 구간으로서 탈황제로서 탄산나트륨 소오다회만을 취입한다. 이미 1단계와 2단계에서 탈황반응에 유리한 분위기가 형성되었으므로 이 구간에서는 투입된 탄산나트륨 소오다회가 얼마나 용선안에서오래 체류하느냐가 탈황효율을 결정짓는 중요한 요소로 작용하게 된다. 이때, 취입속도가 너무 크면 소오다회의 기화 증발에 의한 손실이 커지므로 효율면에서 악영향을 초래하는 문제점이 있으며, 너무 낮을 경우 역시 밸브 콘트롤이 곤란하며, 취입랜스 선단에서 용선중으로 침입하는 동력이 작아져 반응구역이 작아지는 단점이 있으므로, 취입속도는 50∼70㎏/분으로 제한하는 것이 바람직하다. 한편, 상기한 3단계에서의 효율을 더욱 높이기 위하여 랜스 침적깊이비는 0.85∼0.95로 유지하는 것이 바람직하다.On the other hand, the third step is a section in which the desulfurization reaction peaks, blowing only sodium carbonate soda ash as the desulfurization agent. Since the favorable atmosphere for the desulfurization reaction has already been formed in the first and second stages, how long the sodium carbonate soda ash stays in the molten iron is an important factor in desulfurization efficiency. At this time, if the blowing speed is too large, the loss caused by evaporation of soda ash increases, which causes a bad effect in terms of efficiency. If too low, the valve control is difficult, too, and the power penetrating into the molten iron from the tip of the blowing lance is small. Because of the disadvantage that the reaction zone becomes small, the blowing rate is preferably limited to 50 ~ 70kg / min. On the other hand, in order to further increase the efficiency in the above three steps, it is preferable to maintain the lance deposition depth ratio at 0.85 to 0.95.
이하, 본 발명의 산소포텐셜이 높은 슬래그를 가진 용선의 탈황처리 방법을 실시예 및 비교예를 들어 보다 구체적으로 설명하지만 본 발명이 이들예로만 한정되는 것은 아니다.Hereinafter, the desulfurization treatment method for molten iron having a high slag of oxygen potential of the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these examples.
[실시예 1]Example 1
중량%로 3.5~4.0% C, 0.05~0.2% Si, 0.08~0.1% Mn, 0.08~0.09% P, 0.85~0.95% S인 탈규처리를 한 통상의 용선을 용선 운반용기인 토페도카(Torpedo Ladle Car)에 담고, 하기 표 1 및 표 2에 나타낸 바와 같은 조성을 갖는 석회계 탈황제와 탄산나트륨 소오다회를 사용하여, 취입속도 및 랜스 침적깊이비를 상술한 본 발명의 적정범위내에서 조절하면서 3단계 탈황처리과정을 행하였다. 이러한 과정 중 소오다회는 전체 탈황제 중 37∼55중량%의 범위를 갖도록 변경하면서 취입하였다.Torpedo Ladle, which is a molten iron container, is used for degreasing treatment of 3.5% to 4.0% C, 0.05% to 0.2% Si, 0.08% to 0.1% Mn, 0.08% to 0.09% P, and 0.85% to 0.95% S by weight. Car), using a lime-based desulfurization agent and sodium carbonate soda ash having a composition as shown in Table 1 and Table 2, three steps while adjusting the blowing rate and lance deposition depth ratio within the appropriate range of the present invention described above The desulfurization treatment process was performed. During this process, soda ash was blown while changing to have a range of 37 to 55% by weight of the total desulfurization agent.
[비교예 1]Comparative Example 1
탈황제로서 석회계 탈황제만을 사용한 종래의 1단계 방법에 따라 용선예비처리 전에 산화철을 사용한 탈규처리로 인해 산소포텐셜이 높은 슬래그를 가진 용선의 탈황처리를 행하였다.Desulfurization of molten iron having a high oxygen potential due to desulfurization using iron oxide was carried out according to the conventional one-step method using only lime-based desulfurization agent as the desulfurization agent.
하기 반응식 6에 따라 상기한 실시예 및 비교예의 탈황처리된 용선의 탈황효율 및 탈황처리시간 등을 측정한 결과를 하기 표 3에 나타내었다.According to Scheme 6 below, the results of measuring the desulfurization efficiency and desulfurization treatment time of the desulfurized molten iron of Examples and Comparative Examples are shown in Table 3 below.
상기 표 3에서 알 수 있는 바와 같이, 비교예의 석회계 탈황제 3,130㎏을 사용하여 얻어진 탈황반응정수(K′)는 0.20이고, 탈황작업에 소요되는 시간은 29분으로 반응효율이 매우 나쁘고 탈황작업에 소요되는 시간이 길며 탈황제 소요량 또한 크게 나타났다. 이는 탈규처리시 주로 산화철로 구성된 탈규제를 사용하기 때문에용선슬래그의 산소포텐셜이 높아지고 생성된 산화규소로 인해 슬래그의 염기도가 낮아져 CaO의 반응효율이 저하하는데 기인한다. 이에 반하여 실시예에서는 반응효율이 크게 향상되었으며 탈황작업에 소요되는 시간 또한 단축되었다.As can be seen in Table 3, the desulfurization reaction constant (K ′) obtained using 3,130 kg of lime-based desulfurization agent of Comparative Example is 0.20, and the time required for desulfurization is 29 minutes. The time required was long and the desulfurization requirement was also high. This is due to the high oxygen potential of molten iron slag and the low basicity of slag due to the produced silicon oxide, which lowers the reaction efficiency of CaO. On the contrary, in the embodiment, the reaction efficiency was greatly improved, and the time required for the desulfurization operation was also shortened.
이상에서 알 수 있는 바와 같이, 본 발명의 산소포텐셜이 높은 슬래그를 가진 용선의 탈황처리 방법에 따르면 우수한 탈류효율을 나타내며, 탈황처리시간을 단축하여 생산성을 높이고 탈황제 원단위를 줄여 비용을 절감함은 물론, 탈황처리 후의 용선 [S]수준을 종래보다 0.0018% 낮출 수 있어 극저류강 생산에 매우 적합하게 유용할 수 있는 장점이 있다.As can be seen from the above, according to the desulfurization treatment method of molten iron having a high slag of oxygen potential of the present invention shows excellent degassing efficiency, shorten the desulfurization treatment time to increase productivity and reduce the unit of desulfurization agent to reduce costs , Since the molten iron [S] level after the desulfurization treatment can be lowered by 0.0018% than the conventional one, there is an advantage that it can be very useful for the production of ultra-low flow steel.
이상에서 본 발명은 기재된 실시예에 대해서만 상세히 설명되었지만 본 발명의 기술사상 범위 내에서 다양한 변형 및 수정이 가능함은 당업자에게 있어서 명백한 것이며, 이러한 변형 및 수정이 첨부된 특허청구범위에 속함은 당연한 것이다.Although the present invention has been described in detail only with respect to the embodiments described, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims.
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| KR101321850B1 (en) * | 2011-12-12 | 2013-10-22 | 주식회사 포스코 | Producting method of steel |
| KR101353208B1 (en) * | 2011-12-15 | 2014-01-20 | 주식회사 포스코 | Refining method of phosphorus and sulfur in molten steel |
| KR101366304B1 (en) * | 2011-12-12 | 2014-02-21 | 주식회사 포스코 | Molten iron |
| KR101423593B1 (en) * | 2012-12-27 | 2014-07-25 | 주식회사 포스코 | Briquette-Type Desulfurizing Agent for Molten Iron |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3359969B2 (en) * | 1994-01-07 | 2002-12-24 | 新日本製鐵株式会社 | Hot metal desulfurization method |
| JPH08104911A (en) * | 1994-10-03 | 1996-04-23 | Nippon Steel Corp | Manufacturing method of phosphorus-containing steel |
| KR20000042510A (en) * | 1998-12-26 | 2000-07-15 | 이구택 | Method for refining electric furnace |
| KR100391904B1 (en) * | 1999-07-13 | 2003-07-16 | 주식회사 포스코 | Process of refining a molten steel having superior desulfurization ratio |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101012837B1 (en) * | 2003-07-08 | 2011-02-08 | 주식회사 포스코 | Charter treatment method for desulfurization |
| KR101321850B1 (en) * | 2011-12-12 | 2013-10-22 | 주식회사 포스코 | Producting method of steel |
| KR101366304B1 (en) * | 2011-12-12 | 2014-02-21 | 주식회사 포스코 | Molten iron |
| KR101353208B1 (en) * | 2011-12-15 | 2014-01-20 | 주식회사 포스코 | Refining method of phosphorus and sulfur in molten steel |
| KR101423593B1 (en) * | 2012-12-27 | 2014-07-25 | 주식회사 포스코 | Briquette-Type Desulfurizing Agent for Molten Iron |
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| Publication number | Publication date |
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| KR100862032B1 (en) | 2008-10-07 |
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