KR20080071740A - The method of recycling of lsp slag - Google Patents
The method of recycling of lsp slag Download PDFInfo
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- KR20080071740A KR20080071740A KR20070010000A KR20070010000A KR20080071740A KR 20080071740 A KR20080071740 A KR 20080071740A KR 20070010000 A KR20070010000 A KR 20070010000A KR 20070010000 A KR20070010000 A KR 20070010000A KR 20080071740 A KR20080071740 A KR 20080071740A
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- slag
- lsp
- quicklime
- recycling
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- 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
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
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Abstract
Description
본 발명은 제강 공정 중에 발생하는 LSP 슬래그를 공냉처리하여 이를 생석회로 재활용하는 방법에 관한 것이다.The present invention relates to a method of air-cooling LSP slag generated during the steelmaking process and recycling it to quicklime.
일상생활에 우리들이 철이라고 부르는 금속은 일반적으로 강(steel)을 말한다. 이 강은 고로에서 만들어진 용선(액체상태의 선철)에서 불순물인 탄소, 규소, 망간, 인, 유황을 제거하고 여기에 강의 사용용도에 EK라 특수원소를 첨가하여 강을 만드는 일련의 작업이 제강공정이다. 이러한 불순물을 제거하는 작업에서는 다량의 생석회가 사용된다. The metal we call iron in our daily lives is usually steel. This steel is a process of making steel by removing impurities carbon, silicon, manganese, phosphorus and sulfur from molten iron (liquid pig iron) made from blast furnaces and adding special elements such as EK to steel usage. to be. Large amounts of quicklime are used to remove these impurities.
이러한 제강공정은 전로에서 정련을 함으로써 이루어지게 된다. 전로는 마치 장독같이 생겼으며 구동장치에 의하여 360도 회전하게 되어 있어 전로라 한다. 전로는 먼저 소량의 고철(0~30%)을 장입하고, 이어서 고로에서 운반하여 온 용선을 래들에 담아 기중기로 들어올려 이동 운반하여 대기하고 있는 전로를 경동하여 노구로 용선을 부어 전로를 직립하여 다량의 생석회(CaO)를 넣고 산소를 불어 넣는 다. 산소는 용선중의 탄소를 태우고 규소, 망간, 인, 유황 등과 급격히 반응하여 고열(산화열)을 발생하여 연소된다. 이 산화 연소로 생긴 산화물이나 인, 유황 등 불순물은 생석회와 화합하여 슬래그화하여 불순물을 부상분리시킨다. This steelmaking process is accomplished by refining in the converter. The converter looks like a poison, and it is called a converter because it is rotated 360 degrees by the driving device. The converter first loads a small amount of scrap metal (0 ~ 30%), and then loads the charter from the blast furnace into a ladle, lifts it with a crane and pours it into the furnace to pour the charter into the furnace. Add a large amount of quicklime (CaO) and blow oxygen. Oxygen burns carbon in molten iron and reacts rapidly with silicon, manganese, phosphorus, and sulfur to generate high heat (heat of oxidation) and is burned. Impurities such as oxides, phosphorus, and sulfur produced by this oxidative combustion are slag into the lime and combine with the quicklime to separate the impurities.
화학반응식은 아래와 같다The chemical reaction is shown below.
탈류반응 : CaO(생석회탈류제) +S +C →CaS + CODehydration reaction: CaO (lime dehydrating agent) + S + C → Ca + H
CaC2(카이트) + S →CaS +2CCaC 2 (Kite) + S → CaS + 2C
탈린반응 : 2P + 5O →P2O5 Tallinn reaction: 2P + 5O → P 2 O 5
전로용 반응식은 아래와 같다.The reaction scheme for converter is as follows.
탈린로 반응식 : 2P + 5/2O2 + 4CaO → 4CaO.P2O5 Tallinn Reaction Scheme: 2P + 5 / 2O 2 + 4CaO → 4CaO.P 2 O 5
탈류 반응식 : CaO(탈류제) + S(용선중) →CaS -----> 슬래그화 부상Desulfurization reaction formula: CaO (dehydrating agent) + S (molding) → CaS -----> slag flotation
↑ ↑
형석 + Al-Dross 촉진 Fluorite + Al-Dross Promotion
상기와 같은 반응식에 의하여 발생된 LSP슬래그는 포집시 철과 다량 결합하게 된다. LSP slag generated by the reaction scheme as described above is combined with a large amount of iron during collection.
그러므로 LSP 슬래그 내부의 철을 재활용하기 위하여 일정 크기 이상의 슬래그는 그대로 고철원으로 재활용하게 된다.Therefore, in order to recycle the iron inside the LSP slag, slag of a certain size or more is recycled to the scrap metal source as it is.
그러나 일정 크기 이하의 LSP 슬래그는 그대로 고철로 재활용하기에는 경제성이 떨어지게 되므로 이를 처리하기 위한 방법이 요구된다. However, LSP slag of a certain size or less is less economical to recycle as scrap, so a method for treating this is required.
이러한 방법으로써 단광으로 제조하는 방법이 알려져 있으며, 이에 대하여는 대한민국 등록특허 제10-046005호 제강슬래그 중 분철의 단광제조방법과 대한민국 등록특허 제10-0354831호 제강슬래그 중 분정광의 단광제조방법이 있으나, 여전히 그 재활용은 활발하지 못한 실정이다.In this way, there is known a method of manufacturing briquettes, and there is a method of producing briquettes of powdered iron in steelmaking slag of Korea Patent Registration No. 10-046005 and a method of producing briquettes of steelmaking slag in Korean Patent Registration No. 10-0354831. Still, the recycling is not active.
또한 상기 종래의 재활용방식은 슬래그 회수 후 수냉식으로 처리하게 되므로 물이 슬래그 내에 있는 산화칼슘과 결합하여 수화하여 정련능력을 상실하여 생석회로 재활용이 불가능하다는 문제점이 있어 왔다. 이 과정은 다음과 같다.In addition, since the conventional recycling method is treated with water cooling after slag recovery, water has combined with calcium oxide in the slag to hydrate and lose refining ability, thus making it impossible to recycle the quicklime. This process is as follows.
CaO + H2O -> Ca(OH)2 CaO + H 2 O-> Ca (OH) 2
또한, 처리시 물을 사용하므로 환경오염의 문제가 아울러 발생하게 된다.In addition, since water is used in the treatment, environmental pollution also occurs.
이와 같이 종래의 전로 제강법은 용선 중에 있는 불순물인 탄소, 규소, 망간, 인, 유황을 한 공정에서 제거함으로 제강시간이 길고 인, 유황 제거에 한계를 보여와 사전에 이러한 불순물을 제거하는 공정(이하 탈린로라 한다)을 거쳐 전로에서 다시 정련하는 LSP(Less Slag Process)가 개발되었다. 이에 본 발명은 LSP 슬래그를 공냉식으로 처리하여 기존 재활용 방법에서 불가능하였던, 슬래그 내의 생석회를 LSP 슬래그의 경우 전로 생석회로 재활용하는 방법을 제공함에 그 목적이 있 다.As such, the conventional converter steelmaking method removes impurities such as carbon, silicon, manganese, phosphorus, and sulfur in molten iron in one process, and shows a long steelmaking time and shows a limitation in removing phosphorus and sulfur, thereby removing such impurities in advance. The LSP (Less Slag Process) has been developed to re-refine the converter in the converter. Accordingly, an object of the present invention is to provide a method for recycling the quicklime in the slag to the converter quicklime in the case of the LSP slag, which was impossible in the conventional recycling method by treating the LSP slag by air cooling.
상기한 본 발명의 목적은 전로에서 제강 조업 중 발생하는 LSP 슬래그를 슬래그배재장에서 공냉방식으로 냉각시킨 후 스크린을 거쳐 선별된 입도 40mm 이하의 슬래그를 회수하여 이를 LSP 슬래그의 전로 생석회로 재활용하는 방법에 의하여 달성된다.The above object of the present invention is to cool the LSP slag generated during steelmaking operation in the converter in the slag distribution plant by air cooling method to recover the slag having a particle size of 40mm or less through the screen and recycle it to the converter quicklime of the LSP slag Is achieved.
재사용하는 슬래그의 입도를 40mm이하로 제한하는 이유는 입도가 너무 클 경우에는 투입되는 슬래그의 반응계면적이 적어 작업효율이 떨어지기 때문이다. The particle size of the slag to be reused is limited to 40 mm or less because when the particle size is too large, the reaction surface area of the injected slag is small and the working efficiency is reduced.
기계교반 탈항설비(KR)에서 유황을 제거하고, 탈린로에서 인을 제거하는 과정에 발생된 Slag와 전로에서 발생된 슬래그를 통칭하여 LSP 슬래그라한다. 이 때 불순물(유황과 인)을 제거하기 위하여 다량의 생석회가 투입되나 모두 반응되는 것이 아니고 일부는 인과 유황을 제거하는데 사용되지 못하고 미반응의 상태로 슬래그로 배출되게 된다.LSP slag is collectively known as slag generated in the process of removing sulfur from the mechanical stirring desalination plant (KR) and phosphorus from the Tallinn furnace and slag generated in the converter. At this time, a large amount of quicklime is added to remove impurities (sulfur and phosphorus), but not all are reacted, and some are not used to remove phosphorus and sulfur and are discharged into slag as unreacted.
그 이유는 생석회 투입시 생석회가 서로 응집되어 생석회의 반응계 면적이 줄어들기 때문이다. 이렇게 응집된 슬래그는 냉각과정에서 열충격에 의해 다시 분해되며, 이러한 LSP슬래그의 미반응 계면을 이용하여 재차 생석회 대용으로 재활용이 가능하게 되는 것이다. This is because the quicklime is agglomerated with each other and the area of the reaction system is reduced. This aggregated slag is decomposed again by thermal shock during the cooling process, and can be recycled as a substitute for quicklime again by using the unreacted interface of the LSP slag.
이렇게 생성된 LSP 슬래그를 공냉처리장에서 냉각시킨다. 공냉방식이므로 별다른 온도제한 없이 실온에서 냉각시키면 되나, 다만 비나 눈의 영향을 받지 않기 위하여 지붕이 설치된 별도의 공냉처리장에서 냉각시킨다. 냉각된 LSP슬래그를 스크린을 이용하여 40mm이하의 슬래그만 포집한다. The LSP slag thus produced is cooled in an air cooling plant. Because it is an air cooling method, it can be cooled at room temperature without any temperature limitation, but it is cooled in a separate air cooling treatment plant equipped with a roof so as not to be affected by rain or snow. The cooled LSP slag is collected only by slag of less than 40mm using the screen.
이렇게 포집된 LSP 슬래그는 그 크기가 작아 철원으로 바로 재활용할 수 없다. 그러나 상기에서 밝힌 바와 같이 다량의 생석회를 함유하고 있으므로, 이를 바로 생석회 대용으로 사용한다.The collected LSP slag is so small that it cannot be directly recycled to iron sources. However, since it contains a large amount of quicklime as described above, it is used as a quicklime substitute.
이렇게 처리한 LSP 슬래그를 다시 탈린 탈황 조업시 투입하게 되면, 슬래그 재활용 사용량만큼 생석회를 사용하지 않아도 된다.If the LSP slag treated in this way is put in the desulfurization operation again, it is not necessary to use the quicklime as much as the slag recycling amount.
슬래그를 공냉식으로 처리하여, 수화과정을 방지하여 생석회로 재활용할 수 있는 방법을 제공하여 슬래그의 재활용성을 높이고 생석회의 사용량을 절감하여 비용을 절감할 수 있고, 공냉식의 특성상 물을 사용하지 않아 환경오염을 방지할 수 있다.By treating the slag with air cooling, it can prevent the hydration process and recycle it into quicklime, thereby improving the recyclability of slag and reducing the cost of using quicklime, and reducing the cost. Contamination can be prevented.
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KR101460194B1 (en) * | 2013-04-04 | 2014-11-10 | 주식회사 포스코 | A manufacturing method of steel and recycling slag thereof |
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KR101460194B1 (en) * | 2013-04-04 | 2014-11-10 | 주식회사 포스코 | A manufacturing method of steel and recycling slag thereof |
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