Vertical recycled aluminum material manufacturing apparatus

Abstract

To provide an apparatus for producing a recycled aluminum material capable of efficiently and inexpensively producing the recycled aluminum material containing little impurities by using a waste tire and a scrap material containing aluminum as main resources.SOLUTION: Dry-distilled gas is generated by using waste tires 08 in a first boiler 01 and a second boiler 02 which are dry-distilled gasification furnaces, the dry-distilled gas is ignited in a first firing furnace (metal melting furnace) 04, a charged scrap material 11 of aluminum with iron is heated by the generated high-temperature gas and separated from iron, and only molten aluminum is made to flow into a second firing furnace (metal melting furnace) 05 through an outflow hole 12. In the second firing furnace 05, the dry-distilled gas made to flow in from the second boiler 02 is ignited, the charged scrap material 15 of pure aluminum and the molten aluminum made to flow in from the first firing furnace 04 are heated by the generated high-temperature gas, and the molten or reheated aluminum is made to flow out of the second firing furnace 05 to produce a recycled aluminum material.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a light metal melting facility that uses waste tires and aluminum-containing scrap materials as its main resources, and is capable of efficiently and low-costly producing recycled aluminum material with few impurities while minimizing aluminum loss during the recycling stage. [Background technology]

[0002] SDGs stands for "Sustainable Development Goals," and are shared global goals unanimously adopted by member states at the United Nations Summit in September 2015. Target 5 of SDG 12 states, "By 2030, significantly reduce waste generation through prevention, reduction, recycling and reuse." Examples of recycling and reuse include melting metal products such as iron and aluminum to create new products from the recycled metals, and pelletizing plastic products to use in toys and other products. There are also a wide variety of ways to achieve this, such as generating energy from waste materials, as described in Patent Document 1, which describes "extracting carbonization gas from waste tires in a carbonization gasification furnace and combusting the carbonization gas in a light metal melting furnace."

[0003] The invention described in Patent Document 1 mentioned above is a device that uses energy generated from waste materials (waste tires) to melt metals and produce recycled metals. However, when melting scrap aluminum containing iron and extracting the aluminum that reaches its melting point first due to the difference in melting points between iron and aluminum to produce recycled aluminum, impurities contained in the recycled aluminum cannot be sufficiently removed in a single melting process. In order to increase the aluminum content to a level that allows it to be distributed as recycled material, the recycled aluminum must be heated in the same process to remove the impurities, which doubles the effort and cost.

[0004] Next, in order to raise the aluminum content of the iron-containing aluminum scrap material to a level that allows it to be distributed as recycled material, it is possible to provide a first and second melting process in a single metal recycling device. The invention in Patent Document 2 relates to a method for melting iron-containing material in which "the first melting process, the second melting process, and the tapping process constitute one melting process cycle, and this melting process is repeatedly carried out." However, when recycled aluminum is produced using this method, since this invention is merely a process for tapping molten iron, if the iron-containing material is charged into a melting furnace in the second melting process, it is not possible to remove the impurities contained in the recycled aluminum, and the purpose of this invention is to shorten the cycle time, which is different from the purpose of removing impurities.

[0005] The applicant also considered a method of melting aluminum scrap containing iron in the upper furnace, guiding the molten aluminum flowing out of the scrap through a hole connecting the two furnaces to the lower furnace, and reheating the molten aluminum in the lower furnace. However, the molten aluminum heated in the lower furnace flowed in little by little from the upper furnace, which made it more likely to vaporize as it continued to heat, resulting in a loss of recyclable aluminum. While aluminum has a lower melting point than other metals and is therefore easier to recycle, for example, when melting aluminum can scrap or aluminum engine scrap to produce recyclable materials, placing these scraps in a furnace and heating them typically results in a loss of about 20% to 30% of the aluminum. This method is inefficient, and currently, there are more businesses exporting aluminum-containing scrap than businesses recycling aluminum domestically, making it difficult to expand the domestic recycling business. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2006-343002 A [Patent Document 2] Patent No. 7311771 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, the objective of the present invention is to provide a recycled aluminum material production device that uses waste tires and scrap materials containing aluminum as the main resources, and can efficiently and low-costly produce recycled aluminum material with few impurities while minimizing the loss of aluminum during the recycling stage. [Means for solving the problem]

[0008] In order to solve the above problems, the recycled aluminum production device according to the present invention comprises a first boiler (a dry distillation gasification furnace) for generating dry distillation gas using waste tires, a first calcination furnace (a metal melting furnace) connected to the first boiler through a flue, a second boiler for generating dry distillation gas using waste tires, a second calcination furnace (a metal melting furnace) connected to the second boiler through a flue and stacked below the first calcination furnace, an exhaust flue for gas generated in the first calcination furnace, and an exhaust pipe to which the exhaust flue for gas generated in the second calcination furnace is connected and which leads to a chimney, and the first calcination furnace has an inlet for aluminum scrap material with iron and a flue on the bottom. The second firing furnace has an inlet for pure aluminum scrap and an aluminum inlet on its top surface, the aluminum outlet port of the first firing furnace and the aluminum inlet port of the second firing furnace are connected, the dry distillation gas generated from the first boiler is ignited in the first firing furnace, and the aluminum in the iron-containing aluminum scrap is melted by the heat, and the molten aluminum flows into the second firing furnace through the aluminum outlet port, and the dry distillation gas generated from the second boiler is ignited in the second firing furnace, and the pure aluminum scrap and the molten aluminum that has flowed in from the first firing furnace are simultaneously heated by the heat, thereby producing recycled aluminum. In addition to the above features, a water-cooled structure is provided on the outer periphery of the first boiler or the second boiler, and the water-cooled structure has a flow path that contacts the outer surface of the first boiler or the second boiler, and the flow path cools the first boiler or the second boiler by passing cooling water through it, and the cooling water after cooling is discharged as hot water, and the discharged hot water can be used as hot water for heating in greenhouse cultivation or underfloor heating in homes, or as hot water for drying wood, etc. Furthermore, in order to solve the above-mentioned problems, the method for producing recycled aluminum according to the present invention generates dry distillation gas using waste tires in a first boiler, and feeds iron-containing aluminum scrap into a first calcination furnace connected to the first boiler through a flue. In the first calcination furnace, the dry distillation gas flowing in from the first boiler is ignited, and the generated high-temperature gas of 1000 to 1100°C heats the iron-containing aluminum scrap, separates it from the iron, and only the molten aluminum is fed into a second calcination furnace. In the second boiler, dry distillation gas is generated using waste tires. The dry distillation gas is then sent to a second calcination furnace connected via a flue, and in the second calcination furnace, the molten aluminum that has flowed in from the first calcination furnace and is stored in the second calcination furnace is heated by the dry distillation gas that has flowed in from the second boiler and the generated high-temperature gas of 650 to 800°C. Furthermore, pure aluminum scrap is introduced into the stored molten aluminum and heated simultaneously, and the aluminum melted from the pure aluminum scrap and the reheated molten aluminum that has flowed in from the first calcination furnace are discharged out of the second calcination furnace, producing recycled aluminum. [Effects of the Invention]

[0009] The system utilizes combustible gases generated from waste tires as a heat source for heating scrap materials in the first and second kilns. The combustible gases are introduced into the kilns, ignited, and generate high-temperature gases that melt aluminum materials with iron or high aluminum content. This structure has the advantages of reducing fuel costs and eliminating the need for complex temperature control. Furthermore, by maintaining the temperature in the first kiln at 1000-1100°C, it is possible to prevent the emission of harmful and toxic substances such as dioxins, gases, and odors. Scrap aluminum containing iron is heated in the first firing furnace, and the molten aluminum extracted is then poured into the second firing furnace where it is heated again, significantly reducing the impurities contained in the recycled aluminum produced from the molten aluminum in the second firing furnace. By adding pure aluminum scrap to the molten aluminum that flows from the first furnace to the second furnace and heating it simultaneously in the second furnace, it is possible to prevent the loss of pure aluminum scrap during melting and the vaporization of the molten aluminum that flows in, and to produce a large amount of recycled aluminum with few impurities. The structure of the present invention, which completes the entire process from feeding in waste tires to producing recycled aluminum in an integrated device, simplifies labor-intensive work and management, and also achieves operational efficiency. The hot water discharged after cooling each boiler can be used for heating purposes such as greenhouse cultivation and underfloor heating in homes, or for drying wood, making it possible to efficiently utilize the energy generated throughout the entire process, from the input of waste tires to the production of recycled aluminum. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a side cross-sectional view of a recycled aluminum material generating apparatus according to the present invention. [Figure 2] This is a diagram showing the flow of molten aluminum based on Figure 1. [Figure 3] FIG. 2 is a flow chart showing the operation of the recycled aluminum material generating device of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the recycled aluminum material generating apparatus of the present invention will be described below with reference to the accompanying drawings. As shown in the side cross-sectional view of Figure 1, the recycled aluminum production device of the present invention is composed of a first boiler (pyrolysis gasification furnace) 01 for generating dry distillation gas using waste tires, a second boiler (pyrolysis gasification furnace) 02 stacked below the first boiler for also generating dry distillation gas using waste tires, a first calcination furnace (metal melting furnace) 04 for heating iron-containing aluminum scrap material and connected to the first boiler 01 through a flue 03a, a second calcination furnace (metal melting furnace) 05 stacked below the first calcination furnace 01 and connected to the second boiler 02 through a flue 03b for heating pure aluminum scrap material, and an exhaust flue 06a through which gas and steam generated in the first calcination furnace 04 flows out and an exhaust flue 06b through which gas and steam generated in the second calcination furnace 05 flows out, and an exhaust pipe 07 connected to the exhaust flue 06a and the second calcination furnace 05 for

[0012] The first boiler 01 and the second boiler 02 are provided with dry distillation gasification furnaces each having a waste tire inlet 09 for storing waste tires 08 inside the first boiler 01 and the second boiler 02, and dry distill the waste tires 08 that have been introduced into the first boiler 01 and the second boiler 02 to generate dry distillation gas. The introduced waste tires 08 can be sufficiently gasified without the need for work such as crushing and compression. Although not shown, the dry distillation gasification furnaces may be equipped with various functions, such as removing the ash from the waste tires 08 after dry distillation through an ash outlet door, or providing a water-cooling structure on the outer periphery to cool the furnaces of the first boiler 01 and the second boiler 02 after incineration.

[0013] The first firing furnace 04 is a metal melting furnace connected to the first boiler 01 via a flue 03a. Iron-containing aluminum scrap 11 is introduced into the first firing furnace 04 through an inlet 10 for the iron-containing aluminum scrap. The dry distillation gas from the first boiler, which is introduced through the flue 03a, is ignited, and the temperature of the generated high-temperature gas is maintained at 1000°C to 1100°C to heat the iron-containing aluminum scrap 11. Because the melting point of iron in the iron-containing aluminum scrap 11 is 1536°C and that of aluminum is approximately 660°C, the aluminum melts first and flows out to the bottom. The bottom of the first firing furnace 04 is provided with an outlet 12 for the molten aluminum, allowing only the molten aluminum to flow out of the first firing furnace through the outlet 12, thereby separating the iron and aluminum. By inclining the bottom surface of the first firing furnace 04 and providing the outlet hole 12 at the lowest part, the molten aluminum flowing out from the iron-containing aluminum scrap material 11 can be efficiently collected in the outlet hole 12.

[0014] The second firing furnace 05 is a metal melting furnace connected to the second boiler 02 through a flue 03b. An inlet (not shown) connected to the outlet 12 at the bottom of the first firing furnace 04 is provided on the top of the second firing furnace 05. The second firing furnace 05 ignites the dry distillation gas introduced through the flue 03b and dry distilled in the second boiler 02, keeps the temperature of the generated high-temperature gas at 650°C to 800°C, and heats the molten aluminum 13 flowing in through the outlet 12 connecting the first firing furnace 04 and the second firing furnace 05 to produce pure aluminum slag. Pure aluminum scrap 15 is introduced through a scrap material inlet 14, and the molten aluminum 13 and the pure aluminum scrap 15 are heated simultaneously. A molten aluminum outlet 16 is provided at the bottom of the second firing furnace 05. The molten aluminum, consisting of aluminum melted from the iron-containing aluminum scrap 11, which has been heated twice to remove impurities, and aluminum melted from the pure aluminum scrap 15 introduced into the second firing furnace 05, can be discharged through the outlet 16 out of the second firing furnace 05. In this case, it is desirable to introduce the pure aluminum scrap 15 when a certain amount of molten aluminum flowing from the outlet 12 has accumulated in the second firing furnace. This is because the pure aluminum scrap 15 is heated so that it dissolves in the molten aluminum, significantly reducing loss due to vaporization. This method allows for the production of more recycled aluminum than direct heating in a furnace. As with the first firing furnace 04, the bottom surface of the second firing furnace 05 is inclined and an outlet hole 16 is provided at the lowest part of the inclination, so that the molten aluminum can be efficiently discharged from the outlet hole 16.

[0015] The pure aluminum scrap material 15 fed into the second baking furnace 05 can be various, such as scrap aluminum window frames and sashes, or scrap frying pans and pots. However, since soft aluminum materials such as scrap aluminum drink cans lose a large amount of weight even when compressed and fed into the furnace, it is preferable to use scrap aluminum such as frying pans and pots that are formed by stretching the aluminum, but this is not a limitation.

[0016] The exhaust pipe 07 is a cylindrical pipe connecting an exhaust flue 06a through which gas and steam generated in the first kiln flows out and an exhaust flue 06b through which gas and steam generated in the second kiln flows out, and the exhaust pipe 07 is connected to a chimney 17 exposed to the outside of the building, and discharges post-combustion gas and steam outside the building. The vertical recycled aluminum production device according to the present invention can prevent the emission of harmful / toxic gases and odors by increasing the temperature of the gas inside the kiln, but additional functions such as installing an exhaust gas analyzer between the exhaust flue 06a and 06b and the exhaust pipe 07 to further consider the environment may also be added.

[0017] This system utilizes combustible gases generated from waste tires as a heat source for heating scrap materials in the first and second kilns. The combustible gases are introduced into the kilns, ignited, and generate high-temperature gases that melt aluminum with iron and pure aluminum with a high aluminum content. This configuration has the advantages of reducing fuel costs and eliminating the need for complex temperature control. Furthermore, maintaining the temperature in the first kiln at 1000-1100°C prevents the emission of harmful and toxic substances such as dioxins, gases, and odors. Next, by incorporating a process within the equipment in which scrap aluminum containing iron is heated in the first firing furnace, and the molten aluminum extracted is then flowed into the second firing furnace where it is heated again, it is possible to significantly reduce the impurities contained in the recycled aluminum produced from the molten aluminum in the second firing furnace. Then, pure aluminum scrap is added to the molten aluminum that flows from the first firing furnace to the second firing furnace, and is heated simultaneously in the second firing furnace. This prevents the pure aluminum scrap from being lost during melting and the molten aluminum that flows in from vaporizing, making it possible to produce a large amount of recycled aluminum with fewer impurities. Furthermore, the structure of the present invention, which completes the entire process from the input of waste tires to the production of recycled aluminum in an integrated device, simplifies manual work and management, and also realizes operational efficiency.In addition, by using the hot water discharged after cooling from each boiler as hot water for heating greenhouses, floor heating in homes, etc., or for drying wood, etc., the energy generated in the entire process from the input of waste tires to the production of recycled aluminum can also be used efficiently.

[0018] Next, the operation of the vertical recycled aluminum production apparatus of the present invention will be described below with reference to the flow chart of FIG. In the dry distillation gas generation process, waste tires 08 are fed into the first boiler (dry distillation gasification furnace) 01 and the second boiler (dry distillation gasification furnace) 02 shown in Figures 1 and 2 through waste tire feed ports 09a and 09b on the sides of each boiler. Then, the first boiler and the second boiler are ignited and operated, and the waste tires 08 in the furnaces are dry distilled to generate dry distillation gas. In the high-temperature gas melting process, iron-bearing aluminum scrap material 11 is fed into the first firing furnace 04 through a feed port 10, the dry distillation gas generated in the first boiler is flowed into the first firing furnace, the dry distillation gas is ignited, and the temperature of the generated high-temperature gas is maintained at 1000°C to 1100°C to heat the iron-bearing aluminum scrap material 11 in the first firing furnace. The aluminum melts first from the iron-bearing aluminum scrap material 11, and then flows down the bottom of the first firing furnace 04 to a molten aluminum outlet hole 12 provided on the bottom. In the medium-to-high temperature gas melting process, the dry distillation gas generated in the second boiler is flowed into the second firing furnace 05, the dry distillation gas is ignited, the temperature of the generated high-temperature gas is maintained between 650°C and 800°C, and the molten aluminum 13 flowing in from the outlet 12 of the first firing furnace is stored in the second firing furnace 05. In the molten aluminum mixing process, the temperature of the generated high-temperature gas is maintained between 650°C and 800°C, and pure aluminum scrap material 15 (scrap aluminum frying pans and pots) is fed into molten aluminum 13 stored in the second baking furnace through a feed port 14. Then, the pure aluminum scrap material 15 and the molten aluminum that has flowed in from the first baking furnace 04 through an outlet 12 are heated simultaneously. In the recycled aluminum production process, the molten aluminum heated in the second firing furnace 05 flows down the bottom of the second firing furnace 05 and into the molten aluminum outlet 15 located at the bottom of the second firing furnace. A recycled aluminum mold 18 is placed at the outlet of the outlet 15, and the molten aluminum is poured into the mold 18 to produce recycled aluminum material. The scrap aluminum material 11 containing iron heated in the first calcination furnace 04 becomes iron material remaining in the furnace after the aluminum flows out, and the waste tires become ash and other waste after dry distillation in the first and second boilers, so they are removed from each device. The first and second boilers, which are dry distillation gasification furnaces, are equipped with water-cooling structures such as water pipes on their outer peripheries to cool the furnaces. The water used to cool the furnaces is discharged as hot water, which can be used for a variety of purposes, including providing hot water to swimming pools, using it for greenhouse cultivation in greenhouses and for underfloor heating in homes, drying wood and wild vegetables, using it in hot spring facilities, and as an energy source for power generation. [Explanation of symbols]

[0019] 01 No. 1 boiler (dry distillation gasification furnace) 02 No. 2 boiler (dry distillation gasification furnace) 03 Flue 03a Flue connecting the first boiler and the first kiln 03b Flue connecting the second boiler and the second kiln 04 No. 1 firing furnace (metal melting furnace) 05 Second firing furnace (metal melting furnace) 06 Exhaust flue 06a Exhaust flue for gas and steam after combustion in the first kiln 06b Exhaust flue for gas and steam after combustion in the second kiln 07 Exhaust pipe 08 Waste tires 09 Waste tire slot 09a Waste tire inlet for the first boiler 09b Waste tire inlet for the second boiler 10. Aluminum scrap material inlet with iron 11 Aluminum scrap with iron 12. Molten aluminum outlet port of first firing furnace 13 Molten aluminum flowing in from the first baking furnace 14 Pure aluminum scrap material inlet 15 Pure aluminum scrap material 16. Molten aluminum outlet port of second firing furnace 17 Chimney 18 Recycled aluminum mold 19 Direction of movement of molten aluminum

Claims

1. a first boiler for generating dry distillation gas using waste tires; a first calciner connected to the first boiler through a flue; a second boiler for generating dry distillation gas using waste tires; a second calciner connected to the second boiler through a flue and stacked below the first calciner; an exhaust flue for the gas generated in the first calcination furnace and an exhaust pipe connecting the exhaust flue for the gas generated in the second calcination furnace and leading to a chimney; The first firing furnace has an inlet for feeding aluminum scrap containing iron and an aluminum outlet hole on the bottom surface, The second firing furnace has an inlet for pure aluminum scrap material and an aluminum inlet hole on the top surface, the aluminum outlet hole of the first firing furnace and the aluminum inlet hole of the second firing furnace are connected to each other; In the first firing furnace, the dry distillation gas generated from the first boiler is ignited, and the heat is used to melt the aluminum in the aluminum scrap material containing iron, The molten aluminum flows out through the aluminum outflow hole into a second firing furnace, In the second calcination furnace, the dry distillation gas generated from the second boiler is ignited, and the resulting heat is used to simultaneously heat the pure aluminum scrap material and the molten aluminum flowing in from the first calcination furnace, Characterized by producing recycled aluminum Recycled aluminum production equipment

2. a water-cooling structure is provided on the outer periphery of the first boiler or the second boiler; the water-cooling structure has a flow path in contact with an outer surface of the first boiler or the second boiler, the flow path allows cooling water to pass through to cool the first boiler and / or the second boiler; The cooling water after the cooling is discharged as hot water, The discharged hot water can be used as hot water for heating greenhouse cultivation, floor heating in homes, etc., or for drying wood, etc. The recycled aluminum producing apparatus according to claim 1

3. The first boiler uses waste tires to generate dry distillation gas. Feed scrap aluminum containing iron into a first baking furnace connected to the first boiler through a flue; In the first firing furnace, the dry distillation gas flowing in from the first boiler is ignited, and the generated high-temperature gas of 1000°C to 1100°C heats the aluminum scrap material with iron, separates it from the iron, and flows only the molten aluminum into a second firing furnace; In the second boiler, dry distillation gas is generated using waste tires, and the dry distillation gas is sent to a second calciner connected to the second boiler through a flue; In the second firing furnace, the molten aluminum that has flowed in from the first firing furnace and is stored in the second firing furnace is heated by the high-temperature gas of 650°C to 800°C that is generated by igniting the dry distillation gas that has flowed in from the second boiler, and further, pure aluminum scrap material is introduced into the stored molten aluminum and heated at the same time. The pure aluminum scrap material is melted and the reheated molten aluminum that flows from the first firing furnace is discharged out of the second firing furnace, Characterized by producing recycled aluminum Recycled aluminum production method

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