KR100319978B1 - Recovery of aluminum separation from waste steel cans - Google Patents
Recovery of aluminum separation from waste steel cans Download PDFInfo
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- KR100319978B1 KR100319978B1 KR1019980054751A KR19980054751A KR100319978B1 KR 100319978 B1 KR100319978 B1 KR 100319978B1 KR 1019980054751 A KR1019980054751 A KR 1019980054751A KR 19980054751 A KR19980054751 A KR 19980054751A KR 100319978 B1 KR100319978 B1 KR 100319978B1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
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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
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- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
본 발명은 폐 음료용 스틸캔에 커버나 탭의 형태로 포함된 알루미늄합금을 완전 용융시키지 않고 용융온도 직전의 온도로 가열하므로써 스틸캔으로부터 분리, 이를 회수할 수 있도록 한 것이다.The present invention is to be separated from the steel can and recover it by heating to the temperature just before the melting temperature without completely melting the aluminum alloy contained in the form of a cover or tab in the waste can steel can.
따라서 고부가가치소재인 알루미늄분말을 저렴한 가격에 얻을 수 있고, 외국으로부터 전량 수입에 의존하고 있는 알루미늄을 대체하므로써 국가적인 낭비를 줄일 수 있고, 환경을 오염시키던 폐자원을 재활용하므로써 환경보호 등의 일석이조의 효과를 거둘 수 있는 매우 유용한 발명인 것이다.Therefore, high value-added aluminum powder can be obtained at a low price, and national waste can be reduced by replacing aluminum, which relies on imports from foreign countries, and by recycling waste resources that pollute the environment. It is a very useful invention that can be effective.
Description
본 발명은 음료용 폐 스틸캔으로 알루미늄을 분리회수하기 위한 방법에 관한 것으로, 특히 폐 음료용 스틸캔에 커버나 탭의 형태로 포함된 알루미늄합금을 폐 음료용 스틸캔에 커버나 탭의 형태로 포함된 알루미늄합금을 완전 용융시키지 않고 스틸캔으로부터 분리회수하기 위한 방법에 관한 것이다.The present invention relates to a method for separating and recovering aluminum into a waste steel can for beverage, and more particularly, an aluminum alloy contained in the form of a cover or a tab in a waste steel can for waste beverage in the form of a cover or a tab in a steel can for waste beverage. A method for separating and recovering an alloy from a steel can without completely melting the alloy.
지금 우리가 살고 있는 시대는 물질문명의 발달과 산업사회의 고도화에 따라 폐기물은 종류가 다양해지고 그 양은 폭발적으로 증가되어 마침내 환경오염의 주범으로써 심각한 사회문제를 야기하고 있는 실정이다.The age we live in now is due to the development of material civilization and the advancement of industrial society, and the kinds of waste are exploding and the amount is explosively increasing, finally causing serious social problems as the main cause of environmental pollution.
특히 금속폐기물 중 폐 음료용 스틸캔은 알루미늄캔과는 달리 한가지 성분으로만 이루어진 것이 아니므로 이를 재활용하기가 곤란한 것이었다. 즉 몸체는 스틸 재질이고, 커버(cover)와 탭(tap)은 알루미늄재질이며, 캔 표면에 피복된 도료에는 Ti, Sn, Ni 및 Cr산화물과 같은 불순물이 상당량 포함되어 있어 용해하여 고철로 사용한다고 해도 이는 재처리비용이 더욱 부담이 되는 폐단을 갖는 것이다.Particularly, steel cans for waste beverages among metal wastes were difficult to recycle because they are not composed of only one component, unlike aluminum cans. That is, the body is made of steel, the cover and the tap are made of aluminum, and the paint coated on the surface of the can contains a considerable amount of impurities such as Ti, Sn, Ni, and Cr oxides, so that it is dissolved and used as scrap iron. Even if this is the end of the reprocessing costs are more burdened.
따라서 본 발명은 이종의 소재로 제조되어 있고, 피복된 도료중 많은 불순물을 포함하고 있어 재활용되지 못하고 대부분이 일반쓰레기와 함께 폐기되거나 매립 방치되어 폐기되던 스틸캔으로부터 고부가소재인 알루미늄소재를 회수하기 위하여 스틸과 알루미늄의 용융점의 차이를 이용하여 분리시키되, 알루미늄을 완전히 용해시키지 않고 용융온도 직전의 온도로 일정시간 가열하고 진동을 가하므로써 스틸캔으로부터 분리한 뒤 , 이를 회수할 수 있도록 한 것이다.Therefore, the present invention is made of a different material, and contains a lot of impurities in the coated paint, so that most of the steel can be recovered from steel cans that cannot be recycled and are mostly discarded or disposed of with landfills. By using the difference between the melting point of the aluminum and aluminum, the aluminum is not completely dissolved by heating it to a temperature just before the melting temperature for a period of time and by applying a vibration, so that it can be recovered after separation from the steel can.
이처럼 폐 음료용 스틸캔으로루터 알루미늄을 분리해서 회수하는 방법은 현재까지 국내외적으로 발명된 바가 없다.As such, the method of separating and recovering the luther aluminum into the steel can for waste beverage has not been invented at home and abroad.
이하 본 발명의 제조방법을 단계별로 설명하면 다음과 같다.Hereinafter, the manufacturing method of the present invention will be described step by step.
본 발명은 먼저 폐 스틸캔을 수거하여 가열로에 투입하기 용이하도록 절단하는 제 1공정과, 절단된 스틸캔을 400℃∼630℃의 온도를 유지하고 있는 가열로에 투입하는 제 2공정과, 상기 스틸캔을 25∼35분 정도 가열하여 도료층과 스틸소재의 캔몸체로부터 알루미늄합금 커버 및 탭이 분리되도록 하는 제 3공정으로 이루어진 것이다.The present invention firstly collects the waste steel cans and cuts them to be easily put into a heating furnace, a second process of putting the cut steel cans into a heating furnace maintaining a temperature of 400 ° C to 630 ° C, and the steel cans. 3 to 35 minutes to heat the aluminum alloy cover and the tab from the can body of the paint layer and steel material.
상기 각 공정을 좀더 상세히 설명하면 다음과 같다.Each process is described in more detail as follows.
상기 제 1공정은 시중에 방치된 폐 스틸캔을 수거하여 가열로에 투입하기 용이하도록 적당한 크기로 절단 또는 분리하기 위한 것이다.The first step is to collect or separate the waste steel cans left in the market to be cut or separated into a suitable size so as to be easily put into a heating furnace.
대개 수거전문업체에 의해 수거된 스틸캔은 프레스로 압착된 형태(450×300 ×200mm)로 폐 스틸캔으로부터 알루미늄을 회수하기 위한 공장에 전달되어진다. 이때 폐 스틸캔은 주로 음료용 2-피스(piece) 또는 3-피스(piece) 스틸캔이 주류를이룬다. 따라서 상기 압착물을 해체한 다음, 가열로에 투입하기 적당한 크기로 절단장치에 의해 절단하여야 한다. 이때 가열로의 크기에 따라 낱개의 캔은 절단하지 않아도 된다.The steel cans, usually collected by a collection specialist, are delivered to the plant to recover aluminum from the waste steel cans in press-pressed form (450 x 300 x 200 mm). At this time, the waste steel cans are mainly made up of two-piece or three-piece steel cans for beverages. Therefore, the compacted material must be dismantled and then cut by a cutting device to a size suitable for feeding into a furnace. At this time, it is not necessary to cut individual cans according to the size of the furnace.
다음 제 2공정은 절단된 2-피스(piece) 및 3-피스(piece)스틸캔을 400℃∼630℃의 온도를 유지하고 있는 가열로에 투입하는 공정이다. 이때 가열로의 온도를 400℃∼630℃로 유지하여야 하는 이유는 2-피스 스틸캔 내면의 도료층은 400℃이하에서 부터 수지층이 분해되기 시작하여 온도가 상승함에 따라 캔으로부터 완전박리되도록 하기 위한 것이고, 575℃는 알루미늄재질인 커버와 탭이 용융되기 시작하는 온도이고, 630℃는 알루미늄이 산화되지 직전의 온도로 가장 좋은 알루미늄을 얻을 수 있기 때문이다.Next, the second step is a step of inserting the cut two-piece and three-piece steel cans into a heating furnace maintaining a temperature of 400 ° C to 630 ° C. At this time, the temperature of the furnace should be maintained at 400 to 630 ° C. The reason why the paint layer on the inner surface of the two-piece steel can is that the resin layer starts to decompose from 400 ° C. or lower so that it can be completely peeled from the can as the temperature rises. 575 ° C is the temperature at which the cover and tab, which is made of aluminum, starts to melt, and 630 ° C is the best aluminum at the temperature just before the aluminum is oxidized.
제 3공정은 400℃∼630℃의 온도를 유지하고 있는 가열로에 절단된 스틸캔을 넣고 약 25∼35분정도 유지하여 알루미늄커버와 탭만 용융되어 스틸캔으로부터 분리되도록 하기 위한 것이다.The third step is to put the cut steel can into a heating furnace maintaining a temperature of 400 ℃ to 630 ℃ to hold for about 25 to 35 minutes to melt only the aluminum cover and the tab to be separated from the steel can.
이때 스틸캔의 몸통에 ASTM 5000계열의 Al-Mg합금인 알루미늄 커버 및 탭부분은 기계적으로 압접되어 소성된 상태이고, 스틸(Fe)과 알루미늄(Al)의 용융온도는 그 차가 매우 크기 때문에 쉽게 분리시킬 수 있다. 즉 알루미늄합금 커버와 탭은 스틸캔 몸통과 마찬가지로 두께가 양고 쉽게 산화피막을 형성하기 때문에 용융점의 온도에 약간 못미치는 온도로 가열되더라도 스틸캔 몸체와의 젖음성은 크지 않아 각각 575℃ 및 600℃에서 용해가 시작되어 각각 615℃ 및 630℃에서 액상으로 변하게 되어 몸통으로부터 분리되어지고, 알루미늄합금의 고액공존구간인 630℃이상의 온도에서는 급격히 산화가 진행되었다.At this time, the aluminum cover and the tab part of the Al-Mg alloy of ASTM 5000 series to the body of the steel can are mechanically pressed and fired, and the melting temperature of steel (Fe) and aluminum (Al) is easily separated because the difference is very large. Can be. In other words, the aluminum alloy cover and tab are thick and easy to form an oxide film like the steel can body, so even when heated to a temperature slightly below the melting point temperature, the wettability with the steel can body is not so great that melting starts at 575 ℃ and 600 ℃, respectively. The liquid crystals were converted into liquid phases at 615 ° C. and 630 ° C., respectively, and separated from the body. The oxidation proceeded rapidly at a temperature of 630 ° C. or more, which is a solid-liquid coexisting section of the aluminum alloy.
즉 빠른 용융을 위해 순알루미늄의 용융온도인 660℃이상으로 가열로의 온도를 올릴 경우 ASTM 5000계열의 Al-Mg합금으로 제조된 알루미늄커버 및 탭은 급격히 산화가 진행되어 품질이 떨어지는 폐단을 갖는 것이다. 따라서 스틸캔으로 부터 알루미늄 커버와 탭을 분리하는데 가장 적정한 온도는 순알루미늄의 용융온도인 660℃보다 낮고, 적당한 용융으로 인해 스틸캔으로부터 분리가 용이하며, 불순물의 함량도 적은 630℃가 가장 바람직하였다.That is, when the temperature of the heating furnace is raised to 660 ° C or higher, which is the melting temperature of pure aluminum, the aluminum cover and tab made of Al-Mg alloy of ASTM 5000 series rapidly undergo oxidation and have a closed end of poor quality. . Therefore, the most suitable temperature for separating the aluminum cover and the tab from the steel can is lower than 660 ° C., which is the melting temperature of pure aluminum, and is easy to be separated from the steel can due to proper melting.
이때 용융된 알루미늄 커버와 탭이 스틸캔의 몸통으로부터 분리되는 것을 도와주기 위해 바이브레이터나 충격장치를 사용해 진동과 충격을 가하므로써 분리를 촉진시킬 수도 있다.At this time, the molten aluminum cover and the tab may be separated by vibrating or impacting device using a vibrator or an impact device to help separate from the body of the steel can.
현재 거의 전량 수입에 의존하고 있는 고가의 알루미늄분말원료를 본 발명은 폐 음료용 스틸캔으로 분리회수한 알루미늄으로 대신함으로써 상당한 수입대체 효과가 있으며, 방치되어 환경을 오염시키던 폐자원을 재활용하므로써 환경보호 등의 효과를 거둘 수 있을 뿐만 아니라, 알루미늄소재를 저렴한 가격으로 생산할 수 있는 효과를 갖는 발명인 것이다.The present invention has a significant import substitution effect by replacing the expensive aluminum powder raw material, which is almost entirely dependent on imports, with aluminum recovered and separated into waste can steel cans, and by recycling waste resources that have been left to pollute the environment. As well as to achieve the effect, it is an invention having the effect of producing an aluminum material at a low price.
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| KR1019980054751A KR100319978B1 (en) | 1998-12-11 | 1998-12-11 | Recovery of aluminum separation from waste steel cans |
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| KR1019980054751A KR100319978B1 (en) | 1998-12-11 | 1998-12-11 | Recovery of aluminum separation from waste steel cans |
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| KR200452929Y1 (en) * | 2010-01-11 | 2011-03-31 | 주식회사 영창 | Device for recollecting nonferrous metals |
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| KR100648386B1 (en) * | 2005-01-08 | 2006-11-24 | (주)디에스리퀴드 | Recovering method of aluminium metal from Waste Aluminium Can |
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| KR200452929Y1 (en) * | 2010-01-11 | 2011-03-31 | 주식회사 영창 | Device for recollecting nonferrous metals |
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