KR20050064743A - Al-fe base deoxidation agent for use in deoxidation of molten iron - Google Patents
Al-fe base deoxidation agent for use in deoxidation of molten iron Download PDFInfo
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- KR20050064743A KR20050064743A KR1020030096332A KR20030096332A KR20050064743A KR 20050064743 A KR20050064743 A KR 20050064743A KR 1020030096332 A KR1020030096332 A KR 1020030096332A KR 20030096332 A KR20030096332 A KR 20030096332A KR 20050064743 A KR20050064743 A KR 20050064743A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/0025—Charging or loading melting furnaces with material in the solid state
- F27D3/0026—Introducing additives into the melt
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Abstract
본 발명은 제강공정 중의 용강 탈산공정에 사용되는 탈산제에 관한 것으로, 알루미늄 칩(chip)에 스틸 볼을 첨가하여 프레스로 성형하고, 상기 알루미늄 칩에 첨가되는 스틸 볼의 직경이 1～10mm 것을 사용하며, 알루미늄 칩에 첨가되는 스틸 볼의 첨가 비는 알루미늄 칩에 대하여 20～70wt%로 하는 탈산제에 관한 것이며, 특히 알루미늄 칩에 스틸 볼을 첨가하여 그 비중을 3.5～6.0 범위로 하여 만든 용강의 탈산공정에 사용되는 알루미늄-스틸계 탈산제를 제공한다.The present invention relates to a deoxidizer used in a molten steel deoxidation process in a steelmaking process, wherein a steel ball is added to an aluminum chip and formed into a press, and the diameter of the steel ball added to the aluminum chip is 1 to 10 mm. The addition ratio of the steel balls added to the aluminum chips is related to the deoxidizer which is 20 to 70 wt% with respect to the aluminum chips. In particular, the deoxidation process of molten steel made by adding the steel balls to the aluminum chips so that the specific gravity thereof is in the range of 3.5 to 6.0. It provides an aluminum-steel deoxidizer used in the.
이러한 본 발명의 탈산제는 제조비용이 저렴하면서 탈산효과가 뛰어난 특징이 있다.The deoxidizer of the present invention is characterized by excellent deoxidation effect while low manufacturing cost.
Description
본 발명은 제강공정 중의 용강 탈산공정에 사용되는 탈산제에 관한 것으로, 보다 상세하게는 알루미늄 칩(chip)에 스틸 볼을 첨가하여 프레스로 성형하고, 상기 알루미늄 칩에 첨가되는 스틸 볼의 직경이 1～10mm 것을 사용하며, 알루미늄 칩에 첨가되는 스틸 볼의 첨가 비는 알루미늄 칩에 대하여 20～70wt%로 하는 탈산제에 관한 것이며, 특히 알루미늄 칩에 스틸 볼을 첨가하여 그 비중을 3.5～6.0 범위로 하여 만든 용강의 탈산공정에 사용되는 알루미늄-스틸계 탈산제에 관한 것이다.The present invention relates to a deoxidizer used in the molten steel deoxidation step in the steelmaking step, and more particularly, by adding a steel ball to the aluminum chip (molding), forming by a press, the diameter of the steel ball added to the aluminum chip 1 ~ The addition ratio of the steel ball added to the aluminum chip, which is 10mm, is related to the deoxidizer which is 20 to 70 wt% with respect to the aluminum chip. In particular, the steel ball is added to the aluminum chip to make the specific gravity within the range of 3.5 to 6.0. The present invention relates to an aluminum-steel deoxidizer used in the deoxidation process of molten steel.
철을 생산하기 위해서는 제선과정과 제강과정을 거치게 되는데, 도1과 같이 우선 고로에서 선철을 생산하고 이어서 제강과정을 거쳐 철을 생산하게 된다. 제강과정 중에는 고로에 서 생산된 선철이 내부에 탄소가 많이 함유되어 있기 때문에 산소를 투입하여 용강 중의 탄소를 제거하는 탈탄작업을 한다. 탈탄작업이 완료된 용강은 용강 내에 산소를 포함하고 있는 가스 또는 슬래그와 접촉하여 일정량의 산소가 불가피하게 용존해 있게 된다. 이와 같이 용강 중에 용존산소가 존재하게 되면 이들 용존산소는 용강의 응고과정에서 기포 또는 산화물을 생성하여 제품의 품질을 떨어트리는 원인이 된다. 따라서 제강공정에서는 용존산소의 양을 일정량 이하로 감소시키는 탈산작업이 필요하게 되는 것이다.In order to produce iron go through the steelmaking process and steelmaking process, as shown in Figure 1 to produce pig iron first in the blast furnace and then to produce iron through the steelmaking process. During the steelmaking process, pig iron produced in the blast furnace contains a lot of carbon inside, so oxygen is added to decarburize the molten steel. After the decarburization is completed, the molten steel is inevitably dissolved in a certain amount of oxygen in contact with a gas or slag containing oxygen in the molten steel. As such, when dissolved oxygen is present in molten steel, these dissolved oxygen may cause bubbles or oxides in the solidification process of the molten steel to cause deterioration of product quality. Therefore, in the steelmaking process, it is necessary to perform deoxidation to reduce the amount of dissolved oxygen below a certain amount.
제강공정에서는 이러한 탈산작업을 위하여 산소와 친화력이 우수한 금속을 첨가하며, 이를 위한 금속 탈산제로는 알루미늄이 주로 사용되고 있다. 그러나 알루미늄은 용강 및 슬래그의 비중보다 비중이 낮기 때문에 용강에 투입된 알루미늄이 용강중에서 완전히 용해되기 이전에 슬래그층 또는 용강표면으로 부상하는 단점이 있다. 또한 투입된 알루미늄은 용강표면에 형성된 용강의 응고피막 때문에 용강과 직접 접촉하기도 전에 용강표면으로 부상할 수도 있고, 슬래그층에 용해되어 대기중의 산소와 반응하여 쉽게 산화될 수도 있다. 실제 조업 중에 용강이 담긴 래들에 알루미늄을 첨가하여 탈산할 경우 그 탈산율은 30～50%에 지나지 않는 것으로 보고되고 있다.In the steelmaking process, a metal having excellent affinity with oxygen is added for such a deoxidation operation, and aluminum is mainly used as a metal deoxidizer. However, since aluminum has a specific gravity lower than that of molten steel and slag, aluminum injected into molten steel has a disadvantage of rising as a slag layer or molten steel surface before completely dissolving in molten steel. In addition, the injected aluminum may rise to the molten steel surface even before directly contacting the molten steel due to the coagulation film of the molten steel formed on the molten steel surface, or may be dissolved in the slag layer and react with oxygen in the atmosphere to be easily oxidized. It is reported that the deoxidation rate is only 30-50% when aluminum is added to the ladle containing molten steel during actual operation.
이와 같이 알루미늄을 탈산제로 사용할 경우 투입된 알루미늄의 손실율이 높고 알루미늄에 의한 탈산 생성물인 알루미나가 많이 생성되어 용강의 정련조업에 많은 지장을 초래하고 있다. As such, when aluminum is used as a deoxidizer, a high loss rate of the injected aluminum is generated, and alumina, which is a deoxidation product of aluminum, is generated, causing a lot of problems in the refining operation of molten steel.
그러나 지금까지의 방법은 알루미늄의 비중을 높이기 위해서 Fe의 용탕에 알루미늄을 첨가하는 방법이 시도된 바 있으나, Fe-Al이 금속간화합물을 형성하여 이것이 용융되는 온도가 1400～1500℃로 높아 탈산에 문제가 되며, 특히 제조원가가 비싸다는 문제점이 있다. 또 다른 방법은 알루미늄 용탕에 스틸 볼을 넣어서 주조하여 사용하는 것이 제안된 바 있으나, 주조시 알루미늄과 스틸 볼의 비중차이에 의해서 스틸 볼이 알루미늄 용탕 밑에 가라앉아서 스틸 볼이 알루미늄에 균일하게 분포된 탈산제의 제조가 어려운 문제점이 있으며, 용해 및 주조 작업을 해야 하기 때문에 공해 및 오염물질의 발생이 불가피하다는 문제점이 있다.However, in the past, the method of adding aluminum to the molten metal of Fe has been attempted to increase the specific gravity of aluminum. However, Fe-Al forms an intermetallic compound, and the melting temperature thereof is 1400 to 1500 ° C. There is a problem, especially the manufacturing cost is expensive. Another method has been proposed to cast steel balls in aluminum molten metal and cast them. However, due to the difference in specific gravity between aluminum and steel balls, the steel balls settle under the aluminum molten metal so that the steel balls are uniformly distributed in aluminum. There is a problem that is difficult to manufacture, there is a problem that the generation of pollution and pollutants are inevitable because it must be dissolved and cast.
본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 발명된 것으로, 종래의 주조법에 의해 제조되는 탈산제는 알루미늄과 스틸과의 비중 차에 의해서 스틸이 아래쪽에 가라앉기 때문에 균일하게 혼합하기가 곤란하였는 바, 본 발명에서는 프레스에 의한 압축방법을 이용하여 성능은 그대로 유지하면서 제조비용이 저렴하고, 탈산제 내부에 스틸 볼이 균일하게 분포한, 비중이 높고 탈산효과가 뛰어난 알루미늄-스틸계 탈산제를 제공하려는 것이다.The present invention has been invented to solve the above conventional problems, the deoxidizer produced by the conventional casting method was difficult to mix uniformly because the steel sinks to the bottom due to the difference in specific gravity between aluminum and steel. In the present invention, it is to provide an aluminum-steel deoxidizer having a high specific gravity and excellent deoxidizing effect, in which manufacturing cost is low and steel balls are uniformly distributed in the deoxidizer while maintaining performance as it is by using a compression method by a press. .
상기와 같은 목적을 달성하기 위하여, 본 발명은 용강의 탈산공정에 사용하는 탈산제를 구성함에 있어서, 알루미늄 칩에 스틸 볼을 입자상태로 첨가하여 프레스로 압축성형한 알루미늄-스틸계 탈산제를 제공한다.In order to achieve the above object, the present invention provides an aluminum-steel deoxidizer, which is formed by pressing a steel ball in the form of particles to an aluminum chip in the form of a deoxidizer used in the deoxidation process of molten steel.
본 발명에 의한 알루미늄-스틸계 탈산제를 구성함에 있어서는 알루미늄 칩에 첨가되는 스틸 볼의 입도범위를 1～10mm로 하고, 알루미늄 칩에 첨가되는 스틸 볼의 첨가 비는 알루미늄 칩에 대하여 20～70wt%로 한다. 이와 같이하여 제조된 알루미늄-스틸계 탈산제는 그 비중이 2.9～6.0의 범위내에 있다.In constructing the aluminum-steel deoxidizer according to the present invention, the particle size range of the steel balls added to the aluminum chips is 1 to 10 mm, and the addition ratio of the steel balls added to the aluminum chips is 20 to 70 wt% based on the aluminum chips. do. The aluminum-based deoxidizer thus produced has a specific gravity in the range of 2.9 to 6.0.
이하 본 발명에 의한 알루미늄-스틸계 탈산제와 그 제조 방법에 더욱 대하여 상세히 설명한다.Hereinafter, an aluminum-steel deoxidizer and a manufacturing method thereof according to the present invention will be described in detail.
본 발명에 따른 알루미늄-스틸계 탈산제는 알루미늄 칩에 스틸 볼(ball)을 20～70wt%의 비율로 첨가한 다음 일정한 틀에 넣고 프레스로 압축성형한 것이다. 이때 첨가되는 스틸 볼의 입자 크기는 1～10mm 범위이다.The aluminum-based acid deoxidizer according to the present invention is a steel ball added to an aluminum chip at a rate of 20 to 70 wt%, and then put into a predetermined mold and compression molded by a press. The particle size of the steel ball added at this time is in the range of 1 ~ 10mm.
스틸 볼을 알루미늄 칩에 대하여 20wt%이하로 첨가하는 경우에는 제조된 탈산제의 비중이 3.5이하로 되어 이러한 조성을 갖는 탈산제를 용강에 투입할 경우 슬래그의 비중보다 낮아 용강으로 침투가 잘 되지 않아 투입된 알루미늄의 실수율이 낮게 된다. 그리고 스틸 볼을 알루미늄 칩에 대하여 70wt%이상 첨가하는 경우에는 투입된 알루미늄의 실수율은 좋으나 알루미늄의 함량이 너무 낮아 탈산제의 투입량이 많아지게 된다. 따라서 알루미늄 용탕에 첨가되는 스틸 볼의 첨가량은 알루미늄 칩에 대하여 20-70wt%가 바람직하다.When the steel ball is added at 20wt% or less with respect to the aluminum chip, the specific deoxidizer has a specific gravity of 3.5 or less. When the deoxidizer having such a composition is added to molten steel, the specific gravity of the slag is less than that of the slag, so that it does not penetrate into the molten steel. The error rate is low. And when the steel ball is added more than 70wt% with respect to the aluminum chip, the error rate of the added aluminum is good, but the amount of aluminum is too low, so the amount of deoxidizer is increased. Therefore, the amount of steel balls added to the molten aluminum is preferably 20 to 70 wt% based on the aluminum chip.
알루미늄 칩에 첨가되는 스틸 볼은 프레스 성형 후 각 탈산제간의 성분 편차가 적어야 한다. 각 탈산제 간의 성분편차를 최소화하기 위하여 알루미늄 칩은 1mm이하의 크기로, 이 알루미늄 칩에 첨가되는 스틸 볼은 1-10mm정도크기의 입자상태로 첨가하는 것이 바람직하다. Steel balls added to aluminum chips should have less component variation between the deoxidizers after press molding. In order to minimize the component deviation between the deoxidizers, the aluminum chip is preferably 1 mm or less in size, and the steel balls added to the aluminum chip are preferably added in a particle size of 1-10 mm.
본 발명에 의해 제조된 알루미늄-스틸계 탈산제는 그 비중이 3.5-6정도가 되도록 제조하는 것이 바람직하다. 이러한 비중을 갖는 탈산제는 종래의 알루미늄 탈산제에 비하여 비중이 2배정도 크고 슬래그의 비중보다 크기 때문에 용강에 투입할 경우 슬래그 층을 지나 용강 속으로 쉽게 침투할 수 있다.The aluminum-steel deoxidizer prepared by the present invention is preferably prepared so that its specific gravity is about 3.5-6. The deoxidizer having such a specific gravity can easily penetrate into the molten steel through the slag layer when it is added to molten steel because the specific gravity is about 2 times larger than that of the conventional aluminum deoxidizer and larger than the specific gravity of the slag.
본 발명에 따른 알루미늄-스틸계 탈산제의 제조 방법은 먼저 1mm 이하의 알루미늄 칩과 앞에서 설명한 크기범위의 입자상태의 스틸 볼을 첨가하여 혼합기에서 균일하게 혼합한 다음 50mm 직경을 갖는 원통형의 금형내에 성형물을 충진한 후, 프레스로 압축 성형하여 펠렛으로 제조하는 것이다.In the method for producing an aluminum-steel deoxidizer according to the present invention, an aluminum chip of 1 mm or less and steel balls in the granular state of the size range described above are added first, and then uniformly mixed in a mixer, and then the molding is formed into a cylindrical mold having a diameter of 50 mm. After filling, it is compression molded by a press to produce pellets.
이와같이 제조된 본 발명에 따른 알루미늄-스틸계 탈산제를 용강의 탈산조업에 사용할 경우 약 1500℃이상인 용강 내에 탈산제를 직접 투입하여 탈산작업을 하게 된다.When the aluminum-based deoxidizer prepared according to the present invention is used in the deoxidation operation of molten steel, the deoxidizer is directly added to the deoxidizer in molten steel of about 1500 ° C. or more.
용강에 투입된 본 발명의 알루미늄-스틸계 탈산제는 각 구성성분 금속간의 용융점 차이에 의해 알루미늄이 먼저 용해되면서 1차로 탈산작용을 하고, 탈산제는 알루미늄 함유량이 줄어듬에 따라 비중이 점차 증가하여 용강 내부로 깊숙이 침투하면서 용해되어 2차로 탈산작용하게 된다. 따라서 본 발명에 따른 알루미늄-스틸계 탈산제는 용강의 탈산력이 높고 알루미늄의 실수율이 종래의 알루미늄 탈산제보다 높다.The aluminum-steel deoxidizer of the present invention put into molten steel deoxidizes firstly by dissolving aluminum first due to the difference in melting point of each component metal, and the deoxidizing agent gradually increases its specific gravity as the aluminum content decreases to deep inside the molten steel. As it penetrates, it dissolves and deoxidizes secondly. Therefore, the aluminum-steel deoxidizer according to the present invention has a higher deoxidizing power of molten steel and a higher real rate of aluminum than that of a conventional aluminum deoxidizer.
( 실시예 )(Example)
알루미늄-스틸계 탈산제를 제조하기 위하여 크기 1mm이하인 알루미늄 칩 100Kg을 준비하고, 직경 10mm인 스틸 볼 100Kg을 일정 비율로 혼합하여 비중이 3.5～6.0이 되도록 혼합하였다. 이것을 직경 50mm인 프레스 금형에 충진한 후 250톤 용량의 프레스로 성형하여 탈산제를 제조하였다. 알루미늄 칩에 투입되는 스틸 볼은 Fe의 함유량이 99%이었다. 투입된 스틸 볼은 혼합기를 이용하여 균일하게 알루미늄 칩과 스틸 볼이 혼합되도록 30분간 혼합하였다. 혼합된 탈산제용 중간 생성물을 직경 50mm인 원통형의 금형내부에 충진 시킨 후, 250톤 용량의 프레스로 3분간 가압 성형하여 직경50mm 높이 50mm인 탈산제를 제조 하였다. 이와 같이 제조된 탈산제는 도 2에 나타낸 종래의 주조법에 의해 제조된 탈산제와 같이 탈산제의 단면에 알루미늄(10)과 스틸볼(20)의 비중 차에 의해 스틸(20)이 알루미늄(10)용탕의 아래쪽에 가라 앉아 응고된 것과는 달리, 도 3에서처럼 알루미늄 모재(1) 내에 스틸 볼(2)이 균일하게 분산되어 있는 탈산제를 제조할 수가 있었다. In order to prepare an aluminum-steel deoxidizer, 100 Kg of aluminum chips having a size of 1 mm or less were prepared, and 100 Kg of steel balls having a diameter of 10 mm were mixed at a constant ratio and mixed so as to have a specific gravity of 3.5 to 6.0. This was filled into a 50 mm diameter press mold and then molded into a 250 ton press to prepare a deoxidizer. The steel ball added to the aluminum chip had 99% Fe content. The injected steel ball was mixed for 30 minutes to uniformly mix the aluminum chip and the steel ball by using a mixer. After mixing the intermediate product for the deoxidizer was filled into a cylindrical mold having a diameter of 50mm, a deoxidizer having a diameter of 50mm and a height of 50mm was prepared by press molding for 3 minutes with a 250-ton press. The deoxidizer thus prepared is the same as the deoxidizer produced by the conventional casting method shown in FIG. 2, so that the steel 20 is formed by the difference in specific gravity between the aluminum 10 and the steel ball 20 in the cross section of the deoxidizer. Unlike sinking and solidifying at the bottom, it was possible to produce a deoxidizer in which the steel balls 2 were uniformly dispersed in the aluminum base material 1 as shown in FIG.
상술한 바와 같이 본 발명은 알루미늄 칩에 입도가 1～10mm 범위의 스틸 볼을 20%내지 70%까지 첨가하여 알루미늄-스틸계 탈산제를 제조함으로써 상온에서 탈산제를 제조할 수 있고 주조법에 의한 것보다 탈산제의 내부에 스틸 볼이 균일하게 분산되어 있는 양호한 탈산제를 제조할 수 있고, 주조법에 의한 것보다 제조비용이 저렴한 것등의 특징이 있다. As described above, in the present invention, by adding a steel ball having a particle size in the range of 1 to 10 mm to 20% to 70% to prepare an aluminum-steel deoxidizer, the deoxidizer can be prepared at room temperature, and deoxidizer than the casting method. It is possible to produce a good deoxidizer in which steel balls are uniformly dispersed in the interior thereof, and the manufacturing cost is lower than that of the casting method.
도1은 일반적인 제철공정 순서도,1 is a general steelmaking process flow chart,
도2는 종래의 방법으로 제조된 탈산제의 도식적인 단면도,2 is a schematic cross-sectional view of a deoxidizer prepared by a conventional method;
도3은 본 발명에 의해 제조된 탈산제의 도식적인 단면도. Figure 3 is a schematic cross-sectional view of the deoxidizer produced by the present invention.
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on main parts of drawing
1 : 알루미늄모재 2 : 스틸 볼(steel ball)1: Aluminum base material 2: Steel ball
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6025916B1 (en) * | 2015-06-03 | 2016-11-16 | 株式会社山源 | Aluminum briquette and manufacturing method thereof |
| CN111455279A (en) * | 2020-02-28 | 2020-07-28 | 深圳市新星轻合金材料股份有限公司 | Iron-aluminum alloy and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6025916B1 (en) * | 2015-06-03 | 2016-11-16 | 株式会社山源 | Aluminum briquette and manufacturing method thereof |
| CN111455279A (en) * | 2020-02-28 | 2020-07-28 | 深圳市新星轻合金材料股份有限公司 | Iron-aluminum alloy and preparation method thereof |
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