KR100399234B1 - Manufacturing of reduction iron in hot rolling mill oily sludge by addition of blast furnace slag - Google Patents
Manufacturing of reduction iron in hot rolling mill oily sludge by addition of blast furnace slag Download PDFInfo
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- KR100399234B1 KR100399234B1 KR10-1999-0059811A KR19990059811A KR100399234B1 KR 100399234 B1 KR100399234 B1 KR 100399234B1 KR 19990059811 A KR19990059811 A KR 19990059811A KR 100399234 B1 KR100399234 B1 KR 100399234B1
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- blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
본 발명은 가열로에서 배출되는 슬라브를 열간압연하는 열연공장에서 발생된 오일 함유 슬러지를 철원으로 활용이 가능하도록 금속 Fe 성분을 회수하는 방법으로써 열연 오일슬러지에 코크스더스트와 환원 촉진제로 고로슬래그를 첨가하고, 바인더를 혼합하여 성형을 한 후 질소분위기의 가열로에서 환원하여 환원철을 제조하는 방법에 관한 것이다.The present invention is a method for recovering the metal Fe component to use the oil-containing sludge generated in the hot rolling mill hot-rolled slab discharged from the furnace as an iron source to add the blast furnace slag as coke dust and reduction accelerator to the hot rolled oil sludge. The present invention relates to a method of manufacturing reduced iron by mixing the binder and shaping the same, followed by reduction in a nitrogen atmosphere heating furnace.
본 발명은 열연공장에서 발생된 오일함유 슬러지를 건조하는 단계; 건조된 열연오일슬러지와 코크스더스트를 중량비로 9-24로 배합한 후 94-98중량%에 고로슬래그를 2-6중량% 혼합하고 바인더를 첨가하여 형상을 제조하는 단계; 1050℃이상의 질소분위기 가열로에서 환원한 후 냉각하는 단계;를 포함하는 고로슬래그 첨가에 의한 열연오일슬러지의 환원철 제조방법을 제공한다.The present invention comprises the steps of drying the oil-containing sludge generated in the hot rolling mill; Blending the dried hot rolled oil sludge with the coke dust at a weight ratio of 9-24, mixing blast furnace slag at 94-98% by weight, and adding a binder to prepare a shape; It provides a method for producing reduced iron of hot rolled oil sludge by the addition of blast furnace slag comprising the step of cooling after reducing in a nitrogen atmosphere heating furnace of 1050 ℃ or more.
상술한 바와 같은 본 발명을 통하여 제조된 환원철은 열연오일 슬러지, 코크스더스트 및 고로슬래그를 이용하므로서, 환경친화적인 제철소내 폐기물의 재활용 차원에서도 바람직하며, 또한, 본 발명에 의한 환원철은 철원으로서 제강의 생산량 증대에도 크게 기여하여 경제적으로 부가가치의 증대로 원가경쟁력이 확보되며, 생산성에도 큰 효과가 있다.The reduced iron produced through the present invention as described above is preferable in terms of recycling wastes in environmentally friendly steelworks, using hot rolled oil sludge, coke dust and blast furnace slag. It greatly contributes to the increase in production, and economic competitiveness is secured by increasing the added value economically, and it has a great effect on productivity.
Description
본 발명은 가열로에서 배출되는 슬라브를 열간압연하는 열연공장에서 발생된 오일 함유 슬러지를 철원으로 활용이 가능하도록 금속 Fe 성분을 회수하는 방법으로써 열연 오일슬러지에 코크스더스트와 환원 촉진제로 고로슬래그를 첨가하고, 바인더를 혼합하여 성형을 한 후 질소분위기의 가열로에서 환원하여 환원철을 제조하는 방법에 관한 것이다.The present invention is a method for recovering the metal Fe component to use the oil-containing sludge generated in the hot rolling mill hot-rolled slab discharged from the furnace as an iron source to add the blast furnace slag as coke dust and reduction accelerator to the hot rolled oil sludge. The present invention relates to a method of manufacturing reduced iron by mixing the binder and shaping the same, followed by reduction in a nitrogen atmosphere heating furnace.
열연공장에서 발생되는 열연오일슬러지는 환경에 악영향을 미치기 때문에 전처리를 통하여 재활용을 하거나 매립을 하여 환경적으로 안정된 상태로 처리함으로써 환경비용이 많이 소요되고 있는 실정이다.Since the hot rolled oil sludge generated in the hot rolled plant has an adverse effect on the environment, the environmental cost is high because it is recycled through landfill or landfilled and treated in an environmentally stable state.
이러한 열연오일슬러지를 처리하는 관련기술로는 물리적으로 유분을 회수하는 기술이 다양하게 개발되고 있으며, 증류탑 등 화성설비에서 유분을 회수하는 시스템기술로는 미국특허 US 4994169호가 알려져 있다. 또한, 화학적 처리방법으로 비이온성 계면활성제를 이용하여 액포를 형성하여 슬러지와 오일간의 분리 처리하는 기술로 미국특허 US 4536324호가 알려져 있다.As a related technology for treating such hot rolled oil sludge, various techniques for recovering oil are developed. A US Pat. No. 4,994,169 is known as a system technology for recovering oil in a chemical conversion facility such as a distillation column. In addition, US Pat. No. 45,36,324 is known as a technique for separating the sludge and oil by forming a vacuole using a nonionic surfactant as a chemical treatment method.
그러나, 상기 방법들은 복잡한 단계를 거쳐 처리되어지고, 최종적으로 얻어지는 것들은 대부분 매립해 버리는 문제가 있다.However, these methods are processed through complicated steps, and most of the final products are buried.
이에 본 발명자들은 보다 효율적으로 열연오일슬러지를 처리하고자 연구와 실험을 거듭한 결과에 근거하여 본 발명을 제안하게 된 것으로, 본 발명은 건조된 열연오일슬러지, 코크스더스트와 고로슬래그를 첨가하여 혼합하고, 바인더를 첨가하여 성형한 후 질소분위기에서 환원하여 제강용 철원으로서 환원철을 제조하는 방법을 제공하는데 그 목적이 있다.The present inventors have proposed the present invention based on the results of repeated studies and experiments to treat the hot rolled oil sludge more efficiently, the present invention is mixed by adding the dried hot rolled oil sludge, coke dust and blast furnace slag It is an object of the present invention to provide a method for producing reduced iron as an iron source for steelmaking by reducing in a nitrogen atmosphere after molding by adding a binder.
제1도 : 본 발명의 제조공정 흐름도1 is a manufacturing process flow chart of the present invention
제2도 : 본 발명의 실시예에 따른 환원철의 금속화율을 나타낸 그래프2 is a graph showing the metallization rate of reduced iron according to an embodiment of the present invention
제3도 : 고로슬래그 첨가에 의한 환원철의 금속화율을 나타낸 그래프3: Graph showing metallization rate of reduced iron by blast furnace slag addition
제4도 : 고로슬래그 첨가시 온도에 따른 환원철의 금속화율을 나타낸 그래프4: Graph showing metallization rate of reduced iron according to temperature when blast furnace slag is added
상기 목적을 달성하기 위한 본 발명은 열연공장에서 발생된 오일함유 슬러지를 건조하는 단계; 건조된 열연오일슬러지에 코크스더스트를 9-24중량%로 배합한 후 그 배합물의 94-98중량%와 고로슬래그 2-6중량%를 혼합하고 바인더를 첨가하여 형상을 제조하는 단계; 1050℃이상의 질소분위기 가열로에서 환원한 후 냉각하는 단계;를 포함하는 고로슬래그 첨가에 의한 열연오일슬러지의 환원철 제조방법을 제공한다.The present invention for achieving the above object is the step of drying the oil-containing sludge generated in the hot rolling mill; Blending 9 to 24% by weight of coke dust with dried hot rolled oil sludge, mixing 94-98% by weight of the blend with 2-6% by weight of blast furnace slag, and adding a binder to prepare a shape; It provides a method for producing reduced iron of hot rolled oil sludge by the addition of blast furnace slag comprising the step of cooling after reducing in a nitrogen atmosphere heating furnace of 1050 ℃ or more.
이하, 본 발명에 따른 바람직한 일 실시예를 상세하게 설명한다.Hereinafter, a preferred embodiment according to the present invention will be described in detail.
본 발명에서는 유분이 포함된 열연오일슬러지를 100℃이상에서 건조하고 실공정에 활용시 로타리킬른을 통과하는데 20분 이내로 처리하는 것이 바람직하며, 상기 시간내에 건조할 수 있는 온도는 200℃이상을 유지해야 된다.In the present invention, the hot rolled oil sludge containing oil is dried at 100 ° C. or higher and processed within 20 minutes to pass through a rotary kiln when used in a practical process, and the temperature that can be dried within the above time is maintained at 200 ° C. or higher. You should.
상기 건조된 열연오일슬러지에 코크스더스트를 9-24중량%로 배합한 후 그 배합물 94-98중량%에 고로슬래그를 2-6중량% 혼합하고 바인더를 사용하여 형상을 제조하게 되는데, 상기 열연오일슬러지, 코크스더스트와 고로슬래그는 본 발명에 적용하기 위해서는 하기 표1과 같은 화학적 조성을 갖는 것이 바람직하다. 다만, 이는 바람직한 예일 뿐이며 본 발명이 여기에 한정되는 것은 아니다. 또한 탄소성분이 84%이상을 함유한 코크스더스트는 코크스제조공정에서 발생되는 부산물을 활용하게 된 것이다.The dried hot rolled oil sludge is blended with coke dust at 9-24% by weight, and the mixture is 94-98% by weight of blast furnace slag 2-6% by weight, and a shape is prepared by using a binder. Sludge, coke dust and blast furnace slag preferably have a chemical composition as shown in Table 1 in order to apply to the present invention. However, this is only a preferred example and the present invention is not limited thereto. In addition, the coke dust containing more than 84% of the carbon component is to utilize the by-products generated in the coke manufacturing process.
상기 코크스더스트는 고로의 연료로 사용하기 위해서 석탄을 건류하여 괴코크스를 제조하는 공정에서 발생되는 분말상의 코크스로 화학성분이 탄소가 주성분으로 되어있다.The coke dust is powdered coke produced in the process of producing coal-coke by distilling coal in order to use it as a fuel of blast furnace.
상기 열연오일스러지와 코크스더스트에 함유된 화학성분중 알카리 성분(Na2O+K2O), SiO2와 Al2O3은 환원반응을 통하여 환원철을 제조할 때 철산화물과반응하여 융점을 저하시키는 화합물로써 열연오일스러지 중에 포함된 산화철의 환원에 기여하게 된다. 저융점화와 고상반응을 유도하여 환원을 촉진시키는 상기 열연오일스러지와 코크스더스트에 고로에서 저융점이 되도록 하여 용선을 제조하고 발생되는 상기 고로슬래그를 사용하여 환원을 촉진시키는 것을 확인하였다. 이때 고로슬래그를 2중량%이하로 혼합할 경우 그다지 환원촉진 효과를 발현하지 못하였고, 6중량%이상에서는 환원 촉진효과가 더이상 나타나지 않았다. 또한 6중량%이상 첨가시에는 총 Fe의 함량이 작아지므로 바람직하지 못하다. 따라서 본 발명에서 고로슬래그 첨가량은 2-6중량% 첨가하는 것이 바람직하다.Alkali components (Na 2 O + K 2 O), SiO 2 and Al 2 O 3 among the chemical components contained in the hot rolled oil sludge and coke dust are reacted with iron oxide when preparing reduced iron through reduction reaction, As a compound to lower, it contributes to the reduction of iron oxide contained in the hot rolled oil sludge. It was confirmed that the molten iron was prepared in the blast furnace in the hot rolled oil sludge and the coke dust to induce low melting point and solid phase reaction to promote reduction, thereby promoting reduction using the blast furnace slag generated. At this time, when the blast furnace slag was mixed at 2% by weight or less, the reduction promoting effect was not expressed, and at least 6% by weight, the reduction promoting effect was no longer shown. In addition, when more than 6% by weight of the total content of Fe becomes small, it is not preferable. Therefore, in the present invention, the blast furnace slag addition amount is preferably added 2-6% by weight.
상기 열연오일슬러지에 코크스더스트를 9-24중량%(열연오일슬러지를 기준으로 했을 때의 무게비로서 예컨대, 코크스더스트가 9-24중량%로 투입된다면 무게비 100을 기준으로 했을 때 열연오일슬러지는 당연히 76-91중량%가 될 것임)로 배합하는데, 이때 중량비가 9보다 작게되면, 즉 투입되는 코크스더스트양이 열연오일슬러지의 양에 비해 반응량보다 적게 되면 환원반응시에 환원되는 양이 부족하여 90%이상의 환원철을 제조하는데 환원 효과를 발휘하지 못하고; 24보다 크게 투입될 경우에는, 즉 투입되는 코크스더스트의 양이 열연오일슬러지의 양에 비해 상대적으로 반응량보다 많게 되면 환원철중에 포함된 불순물의 양이 증대되어 바람직하지 못한 문제점이 있기 때문에 본 발명에서는 열연오일슬러지와 코크스더스트를 중량비로 9-24를 사용하는 것이 바람직하다. 따라서 열연오일슬러지는 적정 환원상태를 유지하기 위하여 코크스더스트와 밀접한 관계를 지니기 때문에 과잉의 코크스더스트가 투입되지 않으면서 환원에 필요한 탄소량이 충족되도록 배합하는 것이 필요하다.9 to 24% by weight of coke dust in the hot rolled oil sludge (as a weight ratio based on hot rolled oil sludge, for example, if 9 to 24% by weight of coke dust is added, the hot rolled oil sludge is naturally based on a weight ratio of 100). 76-91% by weight), if the weight ratio is less than 9, that is, if the amount of coke dust added is less than the amount of the hot rolled oil sludge, the amount reduced during the reduction reaction is insufficient. No reduction effect in the production of more than 90% reduced iron; In the case of more than 24, that is, if the amount of coke dust introduced is more than the reaction amount relative to the amount of hot rolled oil sludge, the amount of impurities contained in the reduced iron is increased, which is undesirable. It is preferable to use hot rolled oil sludge and coke dust in the weight ratio 9-24. Therefore, hot rolled oil sludge has a close relationship with coke dust in order to maintain an appropriate reduction state, so it is necessary to mix it so that the amount of carbon required for reduction is satisfied without introducing excessive coke dust.
또한 상기 수용성 바인더는 형상제조시의 강도를 내기 위해서 사용하는데, 본 발명에서는 폴리비닐알코올, 또는 카복실메칠셀롤로우스의 2%와 물 98%를 혼합한 용액인 수용성 바인더를 사용하였다.In addition, the water-soluble binder is used to give strength at the time of shape manufacturing. In the present invention, a water-soluble binder, which is a solution in which 2% of polyvinyl alcohol or carboxymethyl cellulose is mixed with 98% of water, is used.
본 발명에서는 통상의 방법으로 형상을 제조한 후 질소분위기에서 환원공정을 거치게 된다. 상기 조성의 건조된 열연오일슬러지, 코크스더스트와 고로슬래그를 혼합하여 수용성 바인더를 첨가하여 가압성형을 하거나 펠렛제조기에서 펠렛을 제조하는 방법으로 형상을 제조하고, 질소분위기로 1050℃이상의 가열로에서 환원 후 냉각하여 환원철을 제조하는 것이다.In the present invention, after the shape is manufactured by a conventional method, a reduction process is performed in a nitrogen atmosphere. The dried hot rolled oil sludge of the composition, coke dust and blast furnace slag are mixed to form a shape by adding a water-soluble binder to press molding or to produce pellets in a pellet maker, and reduced in a heating furnace of 1050 ℃ or more in a nitrogen atmosphere. After cooling to produce reduced iron.
상기한 바와 같은 본 발명의 제조공정을 개략적으로 도1에 나타내었다.The manufacturing process of the present invention as described above is schematically shown in FIG.
다음은 실시예를 통하여 본 발명을 보다 상세히 설명한다.The following describes the present invention in more detail by examples.
실시예 1Example 1
본 발명의 환원철제조를 위한 열연오일슬러지와 코크스더스트의 적정 혼합의 함량을 구하기 위한 실시예로 열연오일슬러지와 코크스더스트의 합이 100%가 되도록 하기 표2와 같은 비율로 배합하고, 바인더를 첨가하여 성형하는 방법으로 제 1도의 제조공정에서와 같이 환원철을 제조하였다. 환원시에는 질소분위기의 가열로에서 1100℃의 온도에서 60분간 환원반응 시켰다. 또 본 발명에 사용되는 바인더는 수용성바인더로 폴리비닐알코올을 사용하였다.As an example for obtaining the proper mixing content of hot rolled oil sludge and coke dust for producing reduced iron of the present invention, the mixture of hot rolled oil sludge and coke dust is 100% and the ratio is as shown in Table 2 below, and a binder is added. Reduced iron was produced as in the manufacturing process of FIG. At the time of reduction, the reaction was reduced for 60 minutes at a temperature of 1100 ° C. in a furnace of nitrogen atmosphere. In the binder used in the present invention, polyvinyl alcohol was used as the water-soluble binder.
상기와 같이 제조된 펠렛의 습식화학분석을 통하여 펠렛중의 T-Fe(Fe총량)과 M-Fe(금속 Fe량)을 측정하여 환원이 일어나는 결과를 제강공정에서 실제로 필요한 데이터인 금속화율을 다음식으로 계산하였으며, 그 결과를 도 2에 나타내었다.Through the wet chemical analysis of the pellets prepared as described above, T-Fe (total amount of Fe) and M-Fe (total amount of metal) in the pellets were measured to reduce the metallization rate, which is actually required data in the steelmaking process. Calculated by food, the results are shown in FIG.
도 2에서와 같이 실용화에 필요한 환원철은 금속화율이 90%이상을 규격으로 요구하고 있다. 따라서 도2의 본 발명예 1∼4와 비교예 2에서는 금속화율이 90%이상을 유지하는 반면에 비교예 1에서는 금속화율이 80%정도에도 미치지 못하였는데, 이것은 코크스더스트량의 부족으로 인하여 환원에 필요한 탄소량이 모자라서 오일슬러지중의 산화철성분을 충분히 환원시키지 못한 결과이다.As shown in FIG. 2, the reduced iron required for practical use requires a metallization rate of 90% or more as a standard. Therefore, in Examples 1 to 4 and Comparative Example 2 of FIG. 2, the metallization rate was maintained at 90% or more, while in Comparative Example 1, the metallization rate was less than about 80%, which was reduced due to the lack of coke dust. This is the result of insufficient iron content in the oil sludge due to insufficient amount of carbon.
또한 비교예 2에서는 충분한 금속화율을 나타내고 있지만 과량의 코크스더스트의 함량으로 환원철내의 메탈 Fe에 탄소성분이 그대로 존재하여 상대적인 메탈 Fe의 비율을 떨어뜨리는 결과를 초래하여 바람직하지 못하다.In Comparative Example 2, although a sufficient metallization rate is shown, the carbon content is still present in the metal Fe in the reduced iron with an excessive amount of coke dust, which results in a decrease in the ratio of the relative metal Fe, which is not preferable.
따라서 본 발명에서는 열연오일슬러지 90-96중량%와 코크스더스트 4-10중량%를 배합하는 비율이 적정배합한 것으로 판단되며, 열연오일슬러지와 코크스더스트와 의 중량비가 9-24사이에서 배합이 이루어진다. 또한 본 발명에서는 상기 폴리비닐알콜 수용성바인더를 사용하였으나 카르복실메칠셀롤로우스 등의 바인더를 사용하여도 공정처리상의 문제는 발생되지 않으므로 본 발명의 제한 조건에서 제외하였다.Therefore, in the present invention, it is determined that the ratio of mixing 90-96% by weight of hot rolled oil sludge and 4-10% by weight of coke dust is appropriate, and the weight ratio between hot rolled oil sludge and coke dust is 9-24. . In addition, although the polyvinyl alcohol water-soluble binder is used in the present invention, even a binder such as carboxyl methyl cellulose is excluded from the limitation condition of the present invention because it does not cause a problem in processing.
실시예 2Example 2
본 발명의 고로슬래그 첨가시의 환원효과를 파악하기 위하여 실시예 1과 같은 방법으로 열연오일슬러지와 코크스더스트를 중량비로 15로 하여 혼합한 배합에 고로슬래그를 0,1,2,3,4,5,6,7중량%를 각각 첨가하여 100중량%가 되도록 하였다. 그후의 공정은 실시예 1과 같은 방법으로 실시하였다.In order to grasp the reducing effect of the blast furnace slag of the present invention in the same manner as in Example 1 hot blast furnace sludge and coke dust in a weight ratio of 15, blast furnace slag 0, 1, 2, 3, 4, 5, 6, 7% by weight of each was added to 100% by weight. Subsequent processes were carried out in the same manner as in Example 1.
상기와 같이 제조된 환원철의 금속화율을 도 3에 나타냈으며, 고로슬래그의 무첨가시에는 92%금속화율을 나타내고 있지만 고로슬래그 첨가량이 본 발명의 범위인 2-6%에서 금속화율이 급격히 증가됨을 알 수 있다.The metallization rate of the reduced iron prepared as described above is shown in FIG. 3, and when the blast furnace slag is not added, 92% metallization rate is shown, but the metallization rate is rapidly increased in the blast furnace slag addition amount of 2-6% of the present invention. Can be.
이것은 열연오일슬러지 및 코크스더스트 중의 불순성분이 고로슬래그에 의해서 융점이 낮아져서 환원반응을 촉진시키는 것을 알 수 있으며, 융점이 낮아지면 코크스더스트의 탄소성분과 슬러지중의 산소성분과의 고상반응으로 일산화탄소를 생성하고, 다시 이산화탄소를 형성하여 배출됨으로서 환원을 촉진시키는 것을 알 수 있다. 고로슬래그의 첨가효과는 첨가량 2중량%이상에서 효과를 발휘하고 있으며, 7중량%이상에서는 그 이하인 6중량%와 그다지 차이를 보이지 않고 있으므로 본 발명에서는 오일슬러지와 코크스더스트 배합에 2-6중량%를 첨가하여 환원철을 제조하는 것이 바람직하다고 하겠다.It can be seen that the impurity components in the hot rolled oil sludge and the coke dust are lowered by the blast furnace slag to promote the reduction reaction, and when the melting point becomes lower, carbon monoxide is formed by the solid phase reaction between the carbon component of the coke dust and the oxygen component in the sludge. It can be seen that it promotes the reduction by generating and again discharging by forming carbon dioxide. The effect of the blast furnace slag is effective in the addition amount of 2% by weight or more, and 7% by weight or more in the present invention does not show a difference with less than 6% by weight in the present invention 2-6% by weight in the combination of oil sludge and coke dust. It is said that it is preferable to add reduced iron to prepare.
실시예 3Example 3
본 발명의 환원처리시의 가열로 온도조건을 도출하기 위하여 열연오일슬러지와 코크스더스트를 중량비로 15로하여 혼합한 97중량%에 고로슬래그를 3중량%를 첨가하여 100중량%가 되도록 하여 바인더를 첨가한 후 가압성형으로 펠렛을 제조하고 질소분위기에서 환원반응시의 온도조건을 1000℃, 1050℃, 1100℃, 1150℃, 1200℃에서 각각 60분간 환원반응 후 냉각하여 제조된 펠렛을 제조하였다. 실시예 1에서와 같은 방법으로 금속화율을 계산하여 도 4에 나타내었다.In order to derive the temperature condition of the heating furnace during the reduction treatment of the present invention, 3 wt% of blast furnace slag was added to 97 wt% of the mixture of hot rolled oil sludge and coke dust in a weight ratio of 15 to 100 wt%. After the addition, pellets were prepared by press molding, and pellets prepared by reducing and cooling the temperature conditions of the reduction reaction in a nitrogen atmosphere at 1000 ° C, 1050 ° C, 1100 ° C, 1150 ° C, and 1200 ° C for 60 minutes were cooled. The metallization rate was calculated in the same manner as in Example 1 and shown in FIG. 4.
도 4에 나타난 바와 같이 환원온도에 따라서 금속화율이 증가되는데, 본 실시예에서는 금속화율 90%이상을 유지하기 위해서 온도조건을 1050℃이상에서 환원반응을 실시하는 것이 바람직하다. 고로슬래그 무첨가시에는 금속화율 90%이상을 유지하기 위해서는 1100℃이상에서 열처리를 해야되는 반면에 고로슬래그를 첨가시에는 보다 저온에서 환원반응이 일어나기 때문이다. 따라서 본 발명에서 환원을 위한 가열로의 온도조건을 1050℃이상에서 실시하는 조건으로 한정하였다.As shown in FIG. 4, the metallization rate is increased according to the reduction temperature. In this embodiment, it is preferable to perform the reduction reaction at a temperature condition of 1050 ° C. or higher to maintain the metallization rate of 90% or more. When no blast furnace slag is added, heat treatment must be performed at 1100 ° C. or higher to maintain the metallization rate of 90% or more, whereas when blast furnace slag is added, a reduction reaction occurs at a lower temperature. Therefore, in the present invention, the temperature condition of the heating furnace for reduction was limited to the conditions carried out at 1050 ℃ or more.
상술한 바와 같은 본 발명을 통하여 제조된 환원철은 열연오일 슬러지, 코크스더스트 및 고로슬래그를 이용하므로서, 환경친화적인 제철소내 폐기물의 재활용 차원에서도 바람직하며, 또한, 본 발명에 의한 환원철은 철원으로서 제강의 생산량 증대에도 크게 기여하여 경제적으로 부가가치의 증대로 원가경쟁력이 확보되며, 생산성에도 큰 효과가 있다.The reduced iron produced through the present invention as described above is preferable in terms of recycling wastes in environmentally friendly steelworks, using hot rolled oil sludge, coke dust and blast furnace slag. It greatly contributes to the increase in production, and economic competitiveness is secured by increasing the added value economically, and it has a great effect on productivity.
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| CN115820333B (en) * | 2021-09-17 | 2024-01-26 | 山东大学 | Recycling recycling method of waste lubricating oil sludge |
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| JPS5413409A (en) * | 1977-07-02 | 1979-01-31 | Nippon Steel Corp | Method and equipment for producing steel-making pellets using sludge containing oil and iron |
| JPS556467A (en) * | 1978-06-28 | 1980-01-17 | Nippon Kokan Kk <Nkk> | Treating method of high iron content sludge |
| JPH06212226A (en) * | 1992-07-29 | 1994-08-02 | Kumsan Material Co Ltd | Powdery iron material for use as friction material and method for reduction thereof |
| JPH09310128A (en) * | 1996-05-21 | 1997-12-02 | Nippon Steel Corp | Treatment of sludge containing oil |
| KR20000040935A (en) * | 1998-12-21 | 2000-07-15 | 이구택 | Method for producing substitute of scrap for steel manufacture using hot rolled oil sludge |
| KR20010017294A (en) * | 1999-08-10 | 2001-03-05 | 이구택 | A Method for Manufacturing Scrap-Substitutions for Steel-Making Using Hot Rolled Mill Oily Sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5413409A (en) * | 1977-07-02 | 1979-01-31 | Nippon Steel Corp | Method and equipment for producing steel-making pellets using sludge containing oil and iron |
| JPS556467A (en) * | 1978-06-28 | 1980-01-17 | Nippon Kokan Kk <Nkk> | Treating method of high iron content sludge |
| JPH06212226A (en) * | 1992-07-29 | 1994-08-02 | Kumsan Material Co Ltd | Powdery iron material for use as friction material and method for reduction thereof |
| JPH09310128A (en) * | 1996-05-21 | 1997-12-02 | Nippon Steel Corp | Treatment of sludge containing oil |
| KR20000040935A (en) * | 1998-12-21 | 2000-07-15 | 이구택 | Method for producing substitute of scrap for steel manufacture using hot rolled oil sludge |
| KR20010017294A (en) * | 1999-08-10 | 2001-03-05 | 이구택 | A Method for Manufacturing Scrap-Substitutions for Steel-Making Using Hot Rolled Mill Oily Sludge |
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