System for melting aluminum and recycling black dross

Abstract

System for melting aluminium and recycling black dross, comprising: an aluminium melting furnace (2) for melting aluminium parts into molten aluminium and a black dross recycling device for recycling black dross generated when the aluminium parts are melted into molten aluminium, wherein the aluminium melting furnace (2) comprises: a heating chamber (10) provided with heating units for heating the molten aluminium (M); a flux force application chamber (30) for applying a flux force to the molten aluminium (M); a melting chamber (20) provided with a vortex unit (21) for generating a vortex that spirally descends in the molten aluminium (M), a flux supply unit for introducing a flux into the vortex (V), and a raw material supply unit for introducing the aluminium parts into the vortex (V); and a flux passage (34) formed in such a manner as tothat it passes through a wall separating the flux force application chamber (30) and the melting chamber (20), and which transfers the molten aluminium (M), onto which the flux force is applied by an accelerator unit, into the melting chamber (20), wherein the aluminium parts comprise at least aluminium parts from used beverage cans, and the flux comprises 93 to 97 parts by weight of a mixture in which sodium chloride and potassium chloride are mixed in equal parts by weight, and 3 to 7 parts by weight of a cryolite, wherein the vortex unit (21) is attached to a side of the melting chamber (20) where it is not positioned in a straight line with the flux passage (34), and wherein, in the vortex unit (21), black dross, which is formed when inclusions contained in the molten aluminium (M) are bound by the flux, repeatedly sinks and rises in the molten aluminium (M) through the vortex.so that the black scabies accumulates into a spherical shape to form a spherical black scabies, and the black scabies recycling device (3) serves to recycle the spherical black scabies.

Description

[Technical field]

[0001] The present invention relates to a system for melting aluminium and recycling black dross and a method for melting aluminium and recycling black dross, wherein the system and the method are used to carry out a process for melting aluminium parts and a process for recycling black dross.

[0002] This application claims the benefit of Korean patent application No. 10-2015-0177933, which was filed with the Korean Patent Office on December 14, 2015, the disclosure of which is incorporated herein by reference. [General state of the art]

[0003] Various aluminum parts used in motor vehicles, household appliances, and building materials are manufactured using an aluminum melting device. An aluminum melting furnace serves to supply molten aluminum to the aluminum casting apparatus. The aluminum melting furnace is a device for melting molten aluminum parts of a specific size at a high temperature.

[0004] A conventional aluminum melting furnace has a temperature increase chamber equipped with a burner for heating the molten aluminum, a chamber for stirring the molten metal equipped with a molten metal pump to pump molten aluminum that is discharged from the temperature increase chamber, and a charging chamber for feeding a compressed aluminum chip mass into molten aluminum that is discharged from the chamber for stirring the molten metal.

[0005] Here, compressed aluminum shavings, also called aluminum ingots, are obtained by compressing a large number of aluminum chips generated during the production or processing of aluminum products. This compression process creates voids, resulting in a large number of cavities within the compressed aluminum shavings. Consequently, in a conventional aluminum melting furnace, heat is not sufficiently transferred to the central section of the compressed aluminum shavings introduced into the molten aluminum, thus reducing melting efficiency. The compressed aluminum shavings can also float on the surface of the molten aluminum, potentially leading to contact with the atmosphere and the formation of aluminum oxide.

[0006] To address the problems described above, which arise from the use of the conventional aluminum melting furnace, a method is also employed for adding a compressed aluminum chip mass to the molten aluminum. This chip mass is pumped from a chamber for stirring the molten metal and then transferred to the charging chamber. However, even in this case, due to the low specific gravity of the compressed aluminum chip mass, the melting process occurs in a state where the compressed aluminum chip mass is suspended in the molten aluminum. Therefore, when the conventional aluminum melting furnace is used, the melting efficiency is reduced, the amount of aluminum oxide produced is increased, and consequently, the yield of pure aluminum is decreased.

[0007] Since aluminum is a metal with highly oxidizing properties, aluminum oxide is produced during the process of melting it into molten aluminum. Increasing the amount of aluminum oxide produced reduces the aluminum recovery rate. Furthermore, the aluminum added to the molten aluminum generally contains color and other inclusions. Increasing the amount of such inclusions reduces the purity of the aluminum.

[0008] To solve the problems caused by such aluminum oxide and inclusions, molten aluminum is treated with a flux that prevents aluminum oxidation and binds inclusions. The dross produced when molten aluminum is treated with a flux is called black dross.

[0009] No method has yet been proposed for effectively recycling black scum, meaning that materials contained in black scum, such as aluminum, aluminum oxide, fluxes, and the like, cannot be recycled according to the application. Therefore, the generated black scum is disposed of. Disposal involves burying black scum in the ground, leading to environmental pollution and resource waste. [Disclosure][Technical Problem]

[0010] Therefore, the present invention was conceived with regard to the above problems, and it is an object of the present invention to provide a system for melting aluminium and recycling black dross, wherein the system has an improved design that increases the efficiency of melting aluminium parts.

[0011] Another object of the present invention is to provide a system for melting aluminium and recycling black dross, wherein the system has an improved design that reduces the amount of aluminium oxide produced.

[0012] Another object of the present invention is to provide a system for melting aluminium and recycling black dross, wherein the system has an improved design that increases the recovery rate of molten pure aluminium.

[0013] Another object of the present invention is to provide a system for melting aluminium and recycling black dross, wherein the system has an improved design that facilitates the recycling of compositions contained in the black dross. [Technical solution]

[0014] According to one aspect of the present invention, a system for melting aluminium and recycling black dross is provided, comprising an aluminium melting furnace for melting aluminium parts to molten aluminium and a black dross recycling device for recycling black dross that is generated when the aluminium parts are melted to molten aluminium. wherein the aluminum melting furnace comprises a heating chamber equipped with heating units for heating the molten aluminum; and a melting chamber equipped with a vortex unit for generating a vortex which spirally descends in the molten aluminum, a flux supply unit for introducing a flux into the vortex, and a raw material supply unit for introducing the aluminum parts into the vortex, wherein in the vortex unit black dross, which is formed when inclusions contained in the molten aluminum are bound by the flux, repeatedly descends and rises through the vortex in the molten aluminum, so that the black dross accumulates into a spherical shape to form spherical black dross, and the black dross recycling device is for recycling the spherical black dross.

[0015] Preferably, the black scabies recycling device comprises a crushing / grinding unit for crushing and grinding the spherical black scabies in order to separate the spherical black scabies into aluminum granules and scabies particle powder; a water decomposition unit for reacting the scabies particle powder with water to decompose the scabies particle powder into soluble solids and insoluble solids; and a precipitation unit for distilling an aqueous solution that is produced when the soluble solids are dissolved in the water, so that the soluble solids are precipitated from the aqueous solution.

[0016] Preferably, the black scabies recycling device further comprises a storage unit for soluble solids for drying and storing the soluble solids that were precipitated in the precipitation unit; an aluminum granule storage unit for storing the aluminum granules; and a storage unit for insoluble solids for drying and storing the insoluble solids.

[0017] Preferably, the comminution / grinding unit comprises a crusher for crushing the spherical black scabies in order to separate the spherical black scabies into aluminium granules and scabies particle powder; and a mill for grinding the scabies powder in order to separate the scabies powder into aluminium granules and the scabies particle powder.

[0018] Preferably, the comminution / grinding unit further comprises a first separation element arranged between the crusher and the mill to separate the aluminum granules and the dross powder from each other, to transfer the aluminum granules to the aluminum granule storage unit, and to transfer the dross powder to the mill; and a second separation element arranged between the mill and the water decomposition unit to separate the aluminum granules and the dross particle powder from each other, to transfer the aluminum granules to the aluminum granule storage unit, and to transfer the dross particle powder to the water decomposition unit.

[0019] Preferably, the aluminium parts comprise at least aluminium parts from used beverage cans, and the flux comprises 93 to 97 parts by weight of a mixture in which sodium chloride (NaCl) and potassium chloride (KCl) are mixed in equal parts by weight, and 3 to 7 parts by weight of a cryolite (potassium cryolite).

[0020] Preferably, the water decomposition unit comprises a reactor for stirring the dross particle powder with water; and a first centrifugal separator for centrifugal separation of the aqueous solution and the insoluble solids.

[0021] Preferably, the precipitation unit comprises a vacuum distillation unit for vacuum distilling the aqueous solution at a predetermined vacuum distillation temperature and pressure to precipitate the soluble solids; and a second centrifugal separator for centrifugal separation of the soluble solids precipitated in the vacuum distillation unit and the aqueous solution.

[0022] Preferably, in the first centrifugal separator, the insoluble solids separated from the aqueous solution by centrifugation are washed with the distilled water produced by vacuum distillation.

[0023] Preferably, the water decomposition unit further comprises a gas collector for collecting the hydrolysis gas that is generated when the dross particle powder is reacted with water.

[0024] Preferably, the black scab recycling device further comprises a gas storage unit for storing the hydrolysis gas that is collected in the gas collector.

[0025] According to another aspect of the present invention, a method for melting aluminium and recycling black dross is provided, comprising a step (A) in which aluminium parts and a flux are added to a vortex formed in molten aluminium to melt the aluminium parts into molten aluminium and black dross, which is formed when inclusions contained in the molten aluminium are bound by the flux, repeatedly sinking and rising through the vortex in the molten aluminium so that the black dross accumulates into a spherical shape to form spherical black dross; (B) a step for crushing and grinding the spherical black dross to separate the spherical black dross into aluminium granules and dross particle powder;(C) a water decomposition step wherein the dross particle powder is decomposed in the presence of water such that the dross particle powder is decomposed into hydrolysis gas, soluble solids and insoluble solids; and (D) a step for treating at least one type of the aluminium granules, the hydrolysis gas, the soluble solids and the insoluble solids so that they are recyclable.

[0026] Step (B) preferably comprises (B1) a step for comminuting the spherical black dung; (B2) a step for separating the aluminium granules and the dung powder into comminuted products of the spherical black dung; and (B3) a step for separating the aluminium granules and the dung particle powder into ground products of the spherical black dung; Step (D) preferably comprises (D1) a step for melting the aluminium granules in the molten aluminium for recycling.

[0027] Preferably, the aluminium parts comprise at least aluminium parts from used beverage cans, and the flux comprises 93 to 97 parts by weight of a mixture in which sodium chloride (NaCl) and potassium chloride (KCl) are mixed in equal parts by weight, and 3 to 7 parts by weight of a cryolite (potassium cryolite).

[0028] Step (D) preferably comprises (D2) a step for collecting and separating the hydrolysis gas; and (D3) a step for separating an aqueous solution generated when the soluble solids are dissolved in the water from the insoluble solids.

[0029] Step (D) preferably further comprises (D4) a step for treating the hydrolysis gas so that it is recyclable, wherein step (D4) comprises a step (D4a) for removing moisture contained in the hydrolysis gas; (D4b) a step for separating and purifying the hydrolysis gas; and (D4c) a step for storing the hydrolysis gas.

[0030] Step (D) preferably further comprises (D5) a step for treating the soluble solids so that they are recyclable, wherein step (D5) comprises a step (D5a) for vacuum distilling the aqueous solution at a predetermined vacuum distillation temperature and a predetermined vacuum distillation pressure to precipitate the soluble solids from the aqueous solution; (D5b) a step for centrifugal separation of the soluble solids and the aqueous solution; (D5c) a step for drying the soluble solids; and (D5d) a step for storing the soluble solids.

[0031] Step (D5) preferably further comprises (D5e) a step for condensing water vapor generated when the aqueous solution is vacuum distilled in step (D5a) to produce distilled water, wherein step (D3) comprises a step (D3a) for centrifugal separation of the insoluble solids and the aqueous solution; (D3b) a step for washing the insoluble solids with the distilled water; and (D3c) a step for centrifugal separation of the insoluble solids and the distilled water.

[0032] Step (D) preferably further comprises (D6) a step for treating the insoluble solids so that they are recyclable, wherein step (D6) comprises a step (D6a) for drying the insoluble solids; (D6b) a step for burning the insoluble solids to convert hydrates contained in the insoluble solids into oxides; and (D6c) a step for storing the insoluble solids. [Beneficial effects]

[0033] The system for melting aluminium and recycling black dross, and the method for melting aluminium and recycling black dross according to the present invention have the following effects.

[0034] First, according to the system and method of the present invention, a flux selectively binds non-metallic inclusions to produce black dross, and the black dross produced is accumulated into a spherical shape by a vortex to form spherical black dross. In this way, the amount of aluminum metal contained in the black dross can be reduced, and consequently, the recovery rate of molten pure aluminum can be increased.

[0035] Secondly, according to the system and method of the present invention, compositions of economic value contained in the spherical black dross can be recycled, thereby improving economic efficiency.

[0036] Thirdly, according to the system and method of the present invention, the compositions contained in the spherical black dross can be recycled into aluminum granules, soluble solids, insoluble solids, and hydrolysis gas. Furthermore, the proportion of compositions contained in the spherical black dross that are disposed of without recycling can be minimized, thereby further improving economic efficiency. List of characters Fig. Figure 1 is a block diagram schematically showing the system for melting aluminium and recycling black dross according to a preferred embodiment of the present invention. Fig. 2 is a schematic view showing the Fig. 1 specified aluminum melting furnace shown. Fig. Figure 3 is a cross-sectional view of the melting chamber and the flux force application chamber, which is located in Fig. 2 is shown. Fig. 4 is a schematic view showing a process in which spherical black dross is formed in the melting chamber, which is in Fig. 2 is shown. Fig. 5 is an image of the spherical black scabies mite found in the Fig. The melting chamber shown in section 2 is formed. Fig. 6 is a top view of the Fig. Figure 2 shows the melting chamber and shows a state in which the spherical black dross floats on the surface of molten aluminium contained in the melting chamber. Fig. 7 is a schematic view showing the Fig. Figure 1 shows a specified black scabies recycling device. Fig. Figure 8 is an image of the powder obtained by grinding scabies. Fig. Figure 9 shows the precipitated and dried soluble solids. Fig.10 is a SEM-EDS diagram showing the results of the qualitative analysis of the data in Fig. 9 shown soluble solids. Fig. 11 is a diagram showing the composition ratio of the in Fig. 9 shown soluble solids. Fig. Figure 12 is a picture of dried insoluble solids. Fig. 13 is an image of burned insoluble solids. Fig. 14 is a SEM-EDS diagram showing the results of the qualitative analysis of the data in Fig. 13 shown are incinerated solids. Fig. 15 is a diagram showing the composition ratio of the in Fig. 13 shown are incinerated solids. Fig. Figure 16 is a flowchart that schematically illustrates the process for melting aluminium and recycling dross according to another preferred embodiment of the present invention. Fig. Figure 17 is a flowchart to explain the step to melt aluminum and the step to crush and grind spherical black dross, which is in Fig. 16 will be specified in detail. Fig. Figure 18 is a flowchart to explain the step of decomposing scabies powder with water and the step of recycling water-decomposed products, which are in Fig. 16 will be specified in detail. [Best way]

[0037] The terms or words used herein are not intended to be limited to ordinary or dictionary definitions and have meanings that correspond to technical aspects of the embodiments of the present invention, in order to express these embodiments in the most suitable way. Accordingly, the constructions of examples and drawings disclosed in this description are only preferred embodiments of the present invention and do not represent the complete inventive concept. Therefore, it should be understood that at the filing date of this application, various equivalents and amendments may exist.

[0038] Elements may be exaggerated, omitted, or schematically illustrated in the following drawings for practical reasons and to clarify their size, and the sizes of elements do not fully reflect their actual size. Detailed descriptions of known functions and configurations included herein are omitted if they obscure the subject matter of the present invention.

[0039] Fig. Figure 1 is a block diagram schematically showing the system for melting aluminium and recycling black dross according to a preferred embodiment of the present invention.

[0040] Referring to Fig. 1 contains a system for melting aluminum and recycling black dross 1 according to a preferred embodiment of the present invention, an aluminium melting furnace 2for melting aluminium parts in flux-treated molten aluminium; and a black dross recycling device. 3 For recycling black dross, which forms when inclusions present in the molten aluminum are bound in the flux during the melting of the aluminum parts. The system for melting aluminum and recycling black dross. 1 is designed to melt aluminium parts in flux-treated molten aluminium to obtain molten aluminium for the production of aluminium castings, and is also designed to treat black dross in such a way that components contained in the black dross are recycled.

[0041] For the sake of a practical explanation, the aluminum melting furnace will be described first. 2 described and then the black scabies recycling device3 described.

[0042] Fig. 2 is a schematic view of the in Fig. 1 specified aluminum melting furnace.

[0043] Referring to Fig. The aluminium melting furnace contains 2 2 a heating chamber 10 for heating the molten aluminium M, a melting chamber 20 , in which aluminium parts A and a flux F are added to the molten aluminium M, and a flux force application chamber 30 to apply flux force to the molten aluminium M.

[0044] As in Fig. Shown in section 2 is the aluminum melting furnace. 2 It is equipped with several rooms defined by walls made of fire-resistant material. The heating chamber 10 , the melting chamber 20 and the flux force impingement chamber 30 are each in one of the several rooms of the aluminum melting furnace 2They are arranged and separated from other rooms.

[0045] The heating chamber 10 is a room for heating the molten aluminum M to a predetermined temperature.

[0046] The heating chamber 10 is with a second river crossing 29 the melting chamber 20 connected, which will be described later, so that the molten aluminum M from the melting chamber 20 into the heating chamber 10 is transferred. The heating chamber 10 features a sealing structure in which the remaining sections, except for those sections that have a first river passage, are enclosed. 16 , which will be described later, and the second river crossing 29 are connected and shielded from the environment, thus minimizing heat loss.

[0047] As in Fig. Shown in section 2, the heating chamber contains 10 Heating units 12for heating the molten aluminum M, tapping holes 14 to remove the molten aluminum M to an area outside the aluminum melting furnace 2 , and the first river crossing 16 to transfer the molten aluminum M, which is in the heating chamber 10 It includes the flux force application chamber 30 .

[0048] The heating units 12 These are devices for heating molten aluminum M to a predetermined temperature.

[0049] As in Fig. 2 shown, the heating units 12 These are burners that are mounted in walls that contain the heating chamber. 10 The temperature to which the molten aluminum M is heated is not particularly limited. The temperature of the molten aluminum M can be measured by a temperature sensor (not shown) located in the heating chamber. 10This is planned. Information on the temperature of the molten aluminum M is transmitted from the temperature sensor to the heating units. 12 transmitted, and based on this information the heating units 12 Heat the molten aluminum M to a predetermined heating temperature.

[0050] The tapping holes 14 These are outlets for removing the molten aluminum M that is in the heating chamber 10 was heated, into an area outside the aluminum melting furnace 2 .

[0051] The tapping holes 14 They can be connected to an aluminum casting device for the production of aluminum castings or to a transfer vessel for molten metal for transferring the molten aluminum M. Opening / closing valves 18 for selectively opening and closing the tapping holes 14 can in the tapping holes 14 appropriate.

[0052] The first river crossing 16 is a passage through which the molten aluminum M, which is in the heating chamber 10 is contained in the flux force application chamber 30 is transferred.

[0053] As in Fig. As shown in 2, this is the first river crossing. 16 formed in such a way that it passes through a wall that forms the heating chamber 10 and separates the flux force application chamber 30. The molten aluminum M enters the flux force application chamber 30 through the first flux passage. 16 introduced.

[0054] Fig. Figure 3 is a cross-sectional view of the melting chamber and the flux force application chamber, which is located in Fig. 2 will be shown, Fig. Figure 4 shows a process in which spherical black scabies forms in the Fig. The melting chamber shown in section 2 is formed, and Fig. 5 is an image of the spherical black scabies mite, which is found in the Fig.The melting chamber shown in section 2 is formed.

[0055] The melting chamber 20 is a space in which the flux F and the aluminum parts A are added to the molten aluminum M.

[0056] The melting chamber 20 is with a third river crossing 34 the river power impingement chamber 30 , which will be described later, are connected in such a way that the molten aluminum M is separated from the flux force application chamber 30 into the melting chamber 20 is transferred. The melting chamber 20 is configured in such a way that it has a structure in which at least part of the top of the melting chamber 20 The melting chamber is open to allow the addition of flux F and aluminum particles A to the molten aluminum M. 20 has a relatively smaller volume than the heating chamber 10 That is, the melting chamber 20has an open design in which the aluminum parts A are placed in the melting chamber 20 It is provided to carry out the melting process and has a volume that is smaller than that of the heating chamber. 10 , in order to reduce heat loss.

[0057] As in Fig. 2 and Fig. Shown in section 3, the melting chamber is included. 20 a vortex unit 21 A flux supply unit is used to generate a vortex V that spirals down in the molten aluminum M. 23 for adding the flux F to the vortex V, a raw material feed unit 25 to add the aluminum parts A to the vortex V and the second flow passage 29 to transfer the molten aluminum M, which is in the melting chamber 20 is contained in the heating chamber 10 .

[0058] The spinal unit 21is an element for generating the vortex V, which in the molten aluminum M that is in the melting chamber 20 It is contained and sinks in a spiral shape.

[0059] The spinal unit 21 is in the melting chamber 20 arranged such that at least one section of the vortex unit 21 is immersed in the molten aluminum M. When the vortex unit 21 generated vortex V and the flow of molten aluminum M, which passes through the third flow passage 34 into the melting chamber 20 When introduced, if the elements are directly opposite each other, the flow of the molten aluminum M can be disrupted. To prevent this, the vortex unit is used. 21 , as in Fig. 2 shown, preferably on one side of the melting chamber 20 attached where it is not in a straight line with the third river crossing 34 is positioned without being limited to it.

[0060] As in Fig. Shown in section 3, the vortex unit contains 21 a rotating shaft 21a , in which a lower end is immersed in the molten aluminum M and an upper end extends outside the molten aluminum M to be axially coupled to a drive motor (not shown), and a stirring blade 21b , which is connected to the lower end of the rotating shaft 21a is axially coupled. When the drive motor is driven, as in Fig. As shown in 3, the stirring paddle 21b around the rotating shaft 21a rotated and as a result the vortex V, which spirals around the rotating shaft 21a sinks in the molten aluminum M that is in the melting chamber 20 is contained, generated.

[0061] The flux supply unit 23is an apparatus for adding the flux F, which is supplied from an external flux source (not shown) to the molten aluminium M which is in the melting chamber 20 is contained, is supplied.

[0062] The flux F is a mixed salt with a lower specific gravity than aluminum and is a material with a high affinity for inclusions. As in Fig. As shown in section 3, the flux supply unit is shown. 23 the flux F to the vortex V, which is created by the vortex unit 21 is generated. Then the flux F is rapidly immersed through the vortex V and melted in the molten aluminum M and then evenly distributed in the melting chamber. 20 distributed. However, the present invention is not limited to this procedure and the flux supply unit 23 can introduce the flux F into a section other than the vortex V.

[0063] The addition time of flux F is not particularly limited. For example, the flux supply unit 23 Add the flux F to the vortex V before the raw material feed unit 25The aluminum particles A are added to the vortex V. Then, the flux F is immersed and melted in the molten aluminum M as it swirls downwards through the vortex V. Since the flux F has a lower specific gravity than aluminum, the flux F melted in the molten aluminum M floats on the surface of the molten aluminum M, forming a molten flux layer, i.e., a molten salt layer, on the surface of the molten aluminum M. Such a molten flux layer prevents the molten aluminum M and the aluminum particles A added to the molten aluminum M from coming into contact with oxygen in the atmosphere, thus reducing the amount of aluminum oxide produced.

[0064] The flux F has a composition that can selectively bind inclusions and form a molten flux layer. Preferably, the flux F may contain 93 to 97 parts by weight of a mixture in which sodium chloride (NaCl) and potassium chloride (KCl) are mixed in equal parts by weight, and 3 to 7 parts by weight of a cryolite (potassium cryolite). More preferably, the flux F may contain 47.5 parts by weight of sodium chloride (NaCl), 47.5 parts by weight of potassium chloride (KCl), and 5 parts by weight of potassium aluminum fluoride (KAlF4).

[0065] When the addition of the aluminum parts A is carried out by the raw material feed unit 25 , which will be described later, when the flux supply unit is started 23 The flux F is introduced into the vortex V simultaneously with the operation of the raw material feed unit. 25or inject it at a different time. This means that even after the addition of the aluminum parts A has started, the flux F can be supplied continuously or discontinuously, depending on the quantity of aluminum parts A being added.

[0066] The flux F is preferably supplied in an amount equal to, but not limited to, the amount of inclusions to be captured. Therefore, the amount of flux F supplied can be adjusted depending on the amount of aluminum parts A supplied and their properties. This means that the amount of flux F supplied can be increased when aluminum parts A containing a large amount of color or other inclusions are supplied. Conversely, the amount of flux F supplied can be decreased when aluminum parts A with high purity are supplied.

[0067] The raw material feeding unit 25is an apparatus for adding the aluminium parts A, which are supplied from an external raw material source (not shown) to the molten aluminium M in the melting chamber 20 is contained, to be supplied.

[0068] As in Fig. As shown in section 3, the raw material feeding unit serves this purpose. 25 the addition of the aluminum parts A to the vortex V, which is from the vortex unit 21 is generated. Then the aluminum parts A can be quickly immersed and melted in the molten aluminum M as they swirl downwards through the vortex V. Accordingly, the contact between the aluminum parts A, immersed in the molten aluminum M, and the atmosphere can be more effectively blocked, so that the amount of aluminum oxide produced can be further reduced.

[0069] The addition time for the aluminum parts A is not particularly limited. For example, the addition of the aluminum parts A from the raw material feeding unit can be25 The process can be initiated after a molten flux layer has formed on the surface of the molten aluminum M. The aluminum parts A can then be immersed in the molten aluminum M, forming a molten flux layer on its surface. This effectively blocks contact between the immersed aluminum parts A and the atmosphere, further reducing the amount of aluminum oxide produced.

[0070] If the diameter of the aluminum parts A is large, the heat transfer rate may be reduced. Therefore, it is preferable to use aluminum parts A with a diameter of 5 cm or less. The composition of the aluminum parts A is not particularly restricted. For example, the aluminum parts A can be aluminum parts from used beverage cans (UBCs, Series 3XXX A and Series 5XXXX A), which mainly contain aluminum, magnesium, and aluminum alloys. The chemical composition of such aluminum parts from used beverage cans is shown in Table 1 below. [Table 1] Part Al alloy series Chemical composition (%) Si Fe Cu Mn Zn Mg Body A 3004 <0,3 <0,70 <0,25 1,0 - 1,5 <0,25 0,8 - 1,3 Lid A 5052 <0,25 <0,40 <0,10 <0,10 <0,10 2,2 - 2,8 tab A 5182 <0,2 <0,35 <0,15 0,2 - 0,5 <0,25 4,0 - 5,0

[0071] Furthermore, inclusions contained within the aluminum particles A have the property of aggregating with the molten aluminum when the aluminum particles A are introduced into the molten aluminum M and melted. A molten flux layer, i.e., the flux F, weakens the cohesive force between the inclusions and the molten aluminum, causing the inclusions and the molten aluminum to dissociate, and selectively binds the inclusions that have dissociated from the molten aluminum to form black dross B1. Due to the volume increase during the dross formation process described above, the black dross B1 has a specific gravity lower than that of the molten aluminum, causing it to float on the surface of the molten aluminum M.

[0072] As in Fig. 3 and Fig.As shown in Figure 4, the black dross B1 is also drawn downwards through the vortex V and is then separated from the vortex V when it reaches the bottom of the vortex V. After being driven to the surface of the molten aluminum M, the black dross B1 is then drawn back into the vortex V by its suction force. Through this process, the black dross B1 merges with the other black dross B1 that is generated on the surface of the molten aluminum M. When this process is repeated, as in Figure 4, the black dross B1 is further divided into two parts. Fig. As shown in Figure 5, several black scabies B1 cluster together in a spherical shape to form spherical black scabies B2. That is, the black scabies B1 is formed by the one in the vertebral unit. 21The generated vortices V repeatedly sink and rise, causing several of the black scabs B1 to clump together into a spherical shape to form the spherical black scab B2. The chemical composition of the spherical black scab B2 is not particularly restricted. For example, as described above, if the aluminum parts A are aluminum parts from used beverage cans (UBC parts) and the flux F contains 47.5 parts by weight of sodium chloride (NaCl), 47.5 parts by weight of potassium chloride (KCl), and 5 parts by weight of potassium aluminum fluoride (KAlF4), the chemical composition of the spherical black scab B2 is shown in Table 2. [Table 2] Chemical substances Chemical composition (%) Al 5-10 Al2O3 25-35 Mg 5-10 MgO 5-10 NaCl 20-30 KCl 20-30

[0073] Since the spherical black dross B2 forms gradually as black dross B1 repeatedly sinks and rises in the molten aluminum M, compared to typical black dross formed without this repeated sinking and rising process, the spherical black dross B2 exhibits an excellent inclusion removal capability. Therefore, the aluminum content in the dross can be further reduced during the formation of the spherical black dross B2 compared to typical black dross formation. For example, typical black dross formed by treating white dross with a flux in a typical process for melting used aluminum beverage cans has an aluminum content of about 50% or more, whereas the spherical black dross B2 has an aluminum content of about 10% or less.Therefore, the formation of spherical black dross B2 can improve the recovery rate of molten pure aluminum. Furthermore, the formation of spherical black dross B2 makes it possible to avoid a dross pressing process, in which dross is pressed out using an exothermic flux and a plunger to recover aluminum bound within the dross, thus reducing the costs associated with dross pressing.

[0074] The second river crossing 29 is a passage for transferring the molten aluminum M, in which the aluminum parts A are melted, into the heating chamber 10 .

[0075] As in Fig. As shown in 2, this is the second river crossing. 29 formed in such a way that it passes through a wall that forms the melting chamber 20 and the heating chamber 10 separates. The molten aluminum M is placed in the heating chamber. 10through the second river crossing 29 introduced.

[0076] The river power impingement chamber 30 is a space for applying flux force to the molten aluminum M such that the molten aluminum M is between the heating chamber 10 and the melting chamber 20 circulates.

[0077] The river power impingement chamber 30 is with the first river crossing 16 the heating chamber 10 connected in such a way that the molten aluminum M is drawn from the heating chamber 10 into the river power impingement chamber 30 is transferred.

[0078] As in Fig. Shown in section 2 is the flux force application chamber. 30 preferably between the first river crossing 16 the heating chamber 10 and the melting chamber 20provided. However, the present invention is not limited to such a configuration and the flux force application chamber 30 can between the second river crossing 29 the melting chamber 20 and the heating chamber 10 be provided for.

[0079] As in Fig. 2 and Fig. Shown in section 3, it contains the flux force application chamber. 30 an acceleration unit 32 to apply flux force to the molten aluminium M in order to accelerate the molten aluminium M, and the third flux pass 34 serves to transfer the molten aluminum M, subjected to flux force, into the melting chamber 20 .

[0080] The acceleration unit 32 is in the river power impingement chamber 30 arranged such that at least one section of the acceleration unit 32immersed in the molten aluminum M. As in Fig. As shown in section 3, the acceleration unit can 32 for example, a pump for molten metal that pumps the molten aluminum M that is in the flux force application chamber 30 contained within, can circulate by receiving a driving force from a drive motor (not shown) located outside the flux force application chamber 30 is arranged.

[0081] The third river crossing 34 is a passage for transferring the molten aluminum M, which passes through the acceleration unit 32 is equipped with flux force, into the flux force application chamber 30 .

[0082] As in Fig. 2 and Fig. As shown in 3, this is the third river crossing. 34 formed in such a way that it passes through the lower part of a wall that forms the flux force application chamber 30 and the melting chamber20 separates in such a way that the third river crossing 34 opposite the wing of the acceleration unit 32 The molten aluminum M is placed in the melting chamber. 20 through the third river crossing 34 introduced.

[0083] In the present description, the flux force application chamber 30 , which is connected to the acceleration unit 32 is equipped between the heating chamber 10 and the melting chamber 20 arranged. However, the present invention is not limited to this arrangement. That is to say, the vortex unit 21 the melting chamber 20 forms the vortex V in order to subject the molten aluminum M to such flux force that the molten aluminum M in the aluminum melting furnace 2 It circulates when the molten aluminum M moves up and down. Accordingly, the flux force can be applied to the flux force chamber. 30and the acceleration unit intended for it 32 can be dispensed with.

[0084] Fig. Figure 6 shows a state where spherical black dross floats on the surface of molten aluminum, which is in the Fig. The melting chamber shown in section 2 is included.

[0085] When a large number of spherical black spores B2 are densely packed in the vortex V, the downward and upward movement of the spherical black spores B2, which is due to the vortex V, is weakened, which can reduce the efficient formation of the spherical black spores B2. Therefore, the spherical black spores B2, which have grown to a predetermined reference diameter, are preferably deposited from the vortex V in order to adjust the density of the spherical black spores B2 located in the vortex V to a suitable level.

[0086] The reference diameter of the spherical black scour B2 is not particularly limited. For example, if the aluminum parts A are aluminum parts from used beverage cans (UBC parts) and the flux F contains 47.5 parts by weight sodium chloride (NaCl), 47.5 parts by weight potassium chloride (KCl), and 5 parts by weight potassium aluminum fluoride (KAlF4), the spherical black scour B2 will have a reference diameter of 2 to 5 cm.

[0087] To separate the spherical black crocus B2, which has grown to the reference diameter, from the vortex V, the melting chamber can 20 as such, furthermore a separation unit 27 exhibiting the spherical black scabies B2 secreted from the vertebra V.

[0088] As in Fig. Shown in section 3, the separation unit contains 27 a separator plate 27awith a shape that can pull the spherical black dross B2, which floats on the surface of the molten aluminium M, away from the vortex V, and a connecting rod 27b for connecting a drive device (not shown) and the separator plate 27a In this case, the drive device is preferably a work vehicle located outside the melting chamber. 20 is intended, without being limited to it.

[0089] If the separation unit 27 As described above, the spherical black dross B2, which has a predetermined reference diameter, can be separated from the vortex V using the separator plate. 27aare pulled away to be separated from the vortex V. Therefore, a reduction in the formation efficiency of the spherical black scabies B2, which can be caused by the compaction of the spherical black scabies B2, can be prevented. In this process, the separation unit can 27 also act to load the spherical black scab B2 from the molten aluminum M and to carry the spherical black scab B2 outwards.

[0090] When the spherical black scabies B2 passes through the separating unit from the vortex V 27 is moved away, as in Fig. Figure 6 also shows the surface of the molten aluminum M, which is in the melting chamber. 20 is contained, covered with the spherical black dross B2, which is separated from the vortex V. Therefore, the molten aluminum M, which is in the melting chamber 20is contained, cut off from the atmosphere by the spherical black dross B2, which covers the molten aluminium M, and the spherical black dross B2 has the effect of cutting off the molten aluminium M, which is in the melting chamber 20 to keep it warm. Since heat loss from the molten aluminum M is minimized by the spherical black dross B2, the temperature of the molten aluminum M is therefore higher than that of molten aluminum that is not covered with spherical black dross.

[0091] In a conventional aluminum melting furnace, the temperature of the molten aluminum contained in a melting chamber is generally 700 °C or below. On the other hand, in an aluminum melting furnace 2 the temperature of the molten aluminum M in the melting chamber 20The temperature contained within is 730 °C or higher. Compared to a conventional aluminum melting furnace, the aluminum melting furnace can 2 Therefore, the efficient melting of the aluminum parts A can be further improved.

[0092] Fig. 7 is a schematic view showing the Fig. Figure 1 shows a specified black scabies recycling device.

[0093] If the aluminum parts A are melted using the aluminum melting furnace described above 2When melted, the black dross B1 clumps together in a spherical shape to form spherical black dross B2. Compared to typical black dross, spherical black dross B2 has a relatively low aluminum content but contains a predetermined amount of compositions with economic value, such as aluminum oxide and the flux F, as well as aluminum. Therefore, if spherical black dross B2 is disposed of by landfill without a pressing process, the compositions it contains will not be recycled, resulting in poor economic efficiency and environmental pollution.

[0094] To solve these problems, the system includes a mechanism for melting aluminum and recycling black dross. 1 the black scabies recycling device3 for processing the spherical black scabies B2, so that compositions contained in the spherical black scabies B2 can be recycled.

[0095] As in Fig. As shown in Figure 7, the black scabies recycling device can be used. 3 a shredding / grinding unit 40 for crushing and grinding the spherical black mange B2 in order to separate the spherical black mange B2 into aluminium granules N and mange particle powder P2; a water decomposition unit 50 , in which the scabies particle powder P2 is reacted with water to decompose into soluble solids S, insoluble solids I and hydrolysis gas G; a precipitation unit 60 for distilling an aqueous solution Q in which the soluble solids S are dissolved, so that the soluble solids S are precipitated; a storage unit for soluble solids 70for drying and storing soluble solids S; an aluminum granule storage unit 80 for storing aluminium granules N; a storage unit for insoluble solids 90 for drying, burning and storing the insoluble solids I; and a gas storage unit 100 for storing the hydrolysis gas G.

[0096] First, there is the crushing / grinding unit. 40 an apparatus for crushing and grinding the spherical black scabies B2.

[0097] The crushing / grinding unit 40 can be a breaker 41 to crush the spherical black dung beetles B2, containing a first separation element 42 for separating the aluminium granules N and the scabies powder P1 into the crushed products of the spherical black scabies B2, a mill 43 for grinding the scabies powder P1, and a second separating element 44for separating the aluminium granules N and the dross particle powder P2, which is from the mill 43 The ground products of the scabies powder P1 were ground into the ground products.

[0098] The Breaker 41 is an apparatus for crushing the spherical black scabies B2 and for separating the spherical black scabies B2 into the aluminium granules N and the scabies powder P1.

[0099] Aluminum particles and aluminum alloy particles with relatively large particle diameters from the aluminum particles and aluminum alloy particles contained in the spherical black dross B2 are agglomerated into aluminum granules and aluminum alloy granules, respectively, due to the heat generated when the spherical black dross B2 is crushed. Conversely, aluminum particles and aluminum alloy particles with relatively small particle diameters from the aluminum particles and aluminum alloy particles contained in the spherical black dross B2 are not agglomerated and become aluminum powder and aluminum alloy powder, respectively. For the sake of clarity, the aluminum granules N and the aluminum alloy granules will henceforth be referred to collectively as aluminum granules N.

[0100] Using the characteristics of aluminium particles, the crusher 41 crushes the spherical black dross B2 that comes from the aluminium melting furnace. 2 is supplied, and separates the spherical black scabies B2 into the aluminum granules N and the scabies powder P1. The scabies powder P1 is a powder form of compositions that are not aluminum particles, which have relatively large particle diameters, from the compositions of the spherical black scabies B2.

[0101] The first separating element 42 is an element for separating the aluminium granules N and the scabies powder P1 into the crushed products of the spherical black scabies B2.

[0102] The structure of the first separation element 42 is not particularly limited. For example, the first separating element can 42The apparatus consists of a shaking sieve with a predetermined first reference particle diameter. The first reference particle diameter is preferably about 10 mm, but is not limited to this.

[0103] The first separating element 42 separates the aluminum granules N and the scabies powder P1 and then transfers the aluminum granules N into an aluminum storage unit 80 and transfers the scabies powder P1 into the mill 43 .

[0104] The mill 43 is an apparatus for grinding the scabies powder P1 in order to separate the scabies powder P1 into the aluminium granules N and the scabies particle powder P2.

[0105] The insoluble solids I contained in the scabies powder P1, such as aluminum oxide and magnesium oxide, are preferably processed into fine particles for easy recycling. The mill is designed accordingly. 43Intended for grinding scabies powder P1 and for processing scabies powder P1 into fine particles.

[0106] If the scabies powder P1 is used with the mill 43 When the material is ground, some of the aluminum particles contained in the scabies powder P1 may agglomerate to form aluminum granules N. The mill grinds accordingly. 43 the scabies powder P1, which comes from the first separation element 42 was transferred, and separates the scabies powder P1 into the aluminium granules N and the ground scabies particle powder P2.

[0107] The second separating element 44 is an element for separating the aluminium granules N and the scabies particle powder P2 into the ground products of the scabies powder P1.

[0108] The structure of the second separation element 44 is not particularly limited. For example, the second separating element can 44The sieve consists of a drum sieve with a predetermined second reference particle diameter. The reference particle diameter is preferably 0.5 mm, but is not limited to this.

[0109] The second separating element 44 separates the aluminium granules N and the dross particle powder P2, which comes from the mill 43 was transferred, and then transfers aluminum granules N into the aluminum granule storage unit. 80 and transfers the scabies particle powder P2 into the water decomposition unit 50 .

[0110] Fig. Figure 8 is an image of the scabies particle powder.

[0111] The water decomposition unit 50 is an apparatus for decomposing the scabies particle powder P2, which is separated by the second separation element 44 was transported by water.

[0112] As in Fig.As shown in Figure 8, the scabies particle powder P2 contains compositions with various physicochemical properties, such as salt flux, aluminum, aluminum-magnesium alloys, magnesium and oxides, and is in the form of a dark grey powder.

[0113] To recycle the compositions contained in the scabies particle powder P2, these compositions are preferably converted and decomposed to facilitate recycling. Therefore, the water decomposition unit is used for this purpose. 50 , which can decompose the scabies particle powder P2 with water, is provided.

[0114] The water decomposition unit 50 can a reactor 52for stirring the scabies particle powder P2 with water to facilitate a decomposition reaction with water in which the scabies particle powder P2 is decomposed into the soluble solids S, the insoluble solids I and the hydrolysis gas G; a gas collector 54 for collecting the hydrolysis gas G; and a first centrifugal separator 56 for centrifugal separation of the aqueous solution Q and the insoluble solids I.

[0115] The reactor 52 is an apparatus for stirring the scabies particle powder P2 and the water in order to promote the hydrolysis of the scabies particle powder P2.

[0116] The reactor 52 It can be a conventional reactor capable of stirring gas, liquid, and solid materials. In the reactor 52The scabies particle powder P2, which is mixed with water in a predetermined ratio, is stirred in such a way that the scabies particle powder P2 is decomposed with the water. The mixing ratio of scabies particle powder P2 to water is preferably 1:2, but is not limited to this.

[0117] The following describes physicochemical phenomena that occur when the scabies particle powder P2 is stirred with water, depending on the properties of the compositions contained in the scabies particle powder P2.

[0118] First, the water-soluble solids S from the compositions contained in the scabies particle powder P2 are dissolved in water. This creates the aqueous solution Q, which contains the soluble solids S as a solution product and water as a solvent. The soluble solids S mainly consist of chloride salts contained in the flux F, such as sodium chloride (NaCl) and potassium chloride (KCl). When the mixing ratio of scabies particle powder P2 to water 1 If : 2, the concentration of chloride salts in the aqueous solution Q is approximately 20%.

[0119] Next, the water-insoluble solids I from the compositions contained in the scabies particle powder P2 are dispersed or precipitated in the aqueous solution Q. The insoluble solids I mainly contain aluminum, aluminum-magnesium alloys, magnesium, aluminum oxide (Al₂O₃), magnesium oxide (MgO), and a spinel oxide (MgAl₂O₄).

[0120] Next, reactants containing the compositions in the dross particle powder P2, which are hydrolyzed in the presence of water, are hydrolyzed by water. This hydrolysis reaction produces hydrolysis solids, hydrolysis gas G, and heat of reaction. The reactants mainly contain metals and metal compounds found in the spherical black dross B2, such as aluminum (Al), magnesium (Mg), and aluminum carbide (Al4C3). Aluminum carbide (Al4C3) is not a primary component present in aluminum can waste, but rather a byproduct generated in a process for manufacturing aluminum parts from used beverage cans.

[0121] As shown in reaction equations 1 to 3, when reactants are hydrolyzed in the presence of water, aluminum oxide and hydrogen are produced as a result of the hydrolysis of aluminum; magnesium oxide and hydrogen are produced as a result of the hydrolysis of magnesium; and aluminum oxide and methane are produced as a result of the hydrolysis of aluminum carbide. In particular, when aluminum or an aluminum alloy is brought into contact with water, the hydrolysis reaction is vigorous, and the temperature of the water rises to 90 °C or above, so that the aforementioned hydrolysis reaction can be further promoted by such a temperature increase. 2Al + 3H2O → Al2O3 + 3H2 + heat<Reaktionsgleichung 1> Mg + H2O → MgO + H2 + heat<Reaktionsgleichung 2> Al4C3 + 6H2O → 2Al2O3 + 3CH4 + heat<Reaktionsgleichung 3>

[0122] Since the hydrolysis solids produced by this hydrolysis reaction mainly consist of insoluble solids, such as aluminum oxide, magnesium oxide, aluminum oxide alloys, and carbon components, these solids are dispersed or precipitated in the aqueous solution Q. Therefore, the insoluble solids I already present in the spherical black scour B2 and the insoluble solids produced by the hydrolysis are dispersed or precipitated in the aqueous solution Q. For the sake of clarity, the insoluble solids I already present in the spherical black scour B2 and the insoluble solids produced by the hydrolysis will henceforth be referred to collectively as the insoluble solids I.

[0123] In addition to the aluminum, magnesium, and aluminum carbide described above, a small amount of reactants contained in the dross particle powder P2 is hydrolyzed to produce the various types of hydrolysis gas G. The composition ratio of the hydrolysis gas G is shown in Table 3 below. [Table 3] classification Gas components (%) hydrogen methane Ethan ethene propane Propen hydrogen sulfide Early Collection (Large Quantity) 48,14 51,55 0,020 0,009 0,009 0,012 0,0047 Late collection (small quantity) 92,13 7,58 0,003 0,001 0,001 0,001 0,0020

[0124] As shown in Table 3, the hydrolysis gas G mainly contains methane (CH4) and hydrogen (H2). Methane and hydrogen constitute approximately 99% of the hydrolysis gas G. In the initial stage of a hydrolysis process, the hydrolysis mainly involves aluminum, aluminum alloys, and aluminum carbide, producing primarily hydrogen and methane. In the later stage of the hydrolysis process, after a predetermined time has elapsed since the start of the process, the hydrolysis mainly involves aluminum and aluminum alloys, producing primarily hydrogen. The analysis of the components of the hydrolysis gas G is preferably, but not limited to, gas chromatographic analysis according to ASTM D1945-03.

[0125] Furthermore, a method for measuring the quantity of hydrolysis gas G is not particularly limited. For example, the quantity of hydrolysis gas G produced can be measured by the following procedure. First, the spherical black dross B2, with a diameter of 2 to 5 cm, is crushed and ground. Next, ground product, large enough to pass through a 0.5 cm (500 µm) hole in the spherical black dross B2, is obtained as a reaction sample. Then, 100 g of the reaction sample and 1 l of distilled water are placed in a closed glass flask with a capacity of 2 l. Next, the reaction sample and the distilled water are stirred at 100 to 200 rpm using a reactor placed inside the glass flask, and the reaction sample is decomposed with the distilled water.The hydrolysis gas G, produced by decomposing the reaction sample with distilled water, is then collected from the distilled water in a graduated cylinder using a water substitution procedure. When 100 g of the reaction sample are decomposed using this procedure, 8 to 12 liters of hydrolysis gas G can be collected.

[0126] The gas collector 54 is an apparatus for collecting the hydrolysis gas G, which is in the reactor 52 is generated.

[0127] The structure of the gas collector 54 It is not particularly limited, and it can be a conventional gas collector capable of collecting gas from an aqueous solution. The gas collector 54 works to extract the hydrolysis gas G from the aqueous solution Q, which is in the reactor 52 is contained, to collect and transfer the hydrolysis gas G into the gas storage unit 100.

[0128] As in Fig.As shown in Figure 7, in order to increase the purity of actually recyclable gas in the hydrolysis gas G or to separate a specific gas suitable for recycling from other gases in the hydrolysis gas G, the gas collector can be used. 54 with a gas separation and gas purification unit 54a It must be equipped with a unit that separates and purifies the gas contained in the hydrolysis gas G. The separation and purification process, which is carried out in the gas separation and purification unit, 54a Its application is not particularly limited. For example, gas contained in the hydrolysis gas G can be used in the gas separation and gas purification unit. 54a The gases are separated and purified using a pressure swing adsorption process. Furthermore, the gas separation and purification unit can also be used. 54a, Methane gas, which has been separated and purified from the hydrolysis gas G, is reformed by steam methane reforming and converted into hydrogen gas.

[0129] Since the hydrolysis gas G is produced by a vigorous hydrolysis reaction, it may also contain a very small amount of moisture. To solve these problems, the gas collector can be used. 54 furthermore, at least one moisture absorber unit 54b , a moisture removal unit (not shown) and a desulfurization unit (not shown). As shown in Fig. Figure 7 shows the moisture absorber unit. 54b , the moisture removal unit and the desulfurization unit preferably upstream of the gas separation and gas purification unit 54a arranged, without being limited to that.

[0130] The first centrifugal separator 56is an apparatus for centrifugal separation of the aqueous solution Q and the insoluble solids I.

[0131] The first centrifugal separator 56 The first centrifugal separator 56 is preferably, but not limited to, a BSP centrifugal separator. It may include a first filter with a predetermined third reference particle diameter suitable for separating the aqueous solution Q and the insoluble solids I. The first filter is preferably a nonwoven filter, and the third reference particle diameter is preferably, but not limited to, 7 to 15 µm.

[0132] In the first centrifugal separator 56 The aqueous solution Q and the insoluble solids I are separated using the first filter. Then the aqueous solution Q is transferred to the precipitation unit. 60 transferred and the insoluble solids I are placed in the storage unit for insoluble solids 90transferred.

[0133] When the insoluble solids I and the aqueous solution Q enter the first centrifugal separator 56 While some of the aqueous solution Q cannot be separated and is adsorbed into the insoluble solids I. However, since the aqueous solution Q contains the soluble solids S, products manufactured by recycling the insoluble solids I can be corroded by chlorides contained in the soluble solids S. Furthermore, if the insoluble solids I are dried and incinerated, sodium oxide (Na₂O) and potassium oxide (K₂O) are generated from chlorides contained in the soluble solids S. The shelf life of a product manufactured by recycling the insoluble solids I can be reduced due to the presence of sodium oxide and potassium oxide.

[0134] To prevent this, the first centrifugal separator can be used. 56 The insoluble solids I, into which the aqueous solution Q is absorbed, are washed using distilled water such that the chlorine concentration contained in the insoluble solids I is equal to or lower than a predetermined reference chlorine concentration. Then, the insoluble solids I and the distilled water used to wash the insoluble solids can be centrifuged. The process of washing the insoluble solids I with distilled water can be repeated until the chlorine concentration contained in the insoluble solids I is lower than the reference chlorine concentration. The reference chlorine concentration is preferably 300 ppm, but is not limited to this. In this case, the first centrifugal separator is used 56the insoluble solids I are preferably washed with distilled water D, which is produced by condensing water vapor T from a vacuum distillation apparatus 62 through the capacitor 64 the precipitation unit 60 is evaporated, which will be described later, without being limited to that.

[0135] The precipitation unit 60 is an apparatus for distilling the aqueous solution Q such that the soluble solids S are precipitated from the aqueous solution Q.

[0136] The precipitation unit 60 Can a vacuum distillation plant 62 for vacuum distillation of the aqueous solution Q at a predetermined temperature and pressure in order to precipitate the soluble solids S; the condenser 64to produce the distilled water D by condensing the water vapor T produced by evaporating water contained in the aqueous solution Q through the vacuum distillation apparatus 62 is produced; and a second centrifugal separator 66 for the centrifugal separation of the soluble solids S, which are carried out by the vacuum distillation system 62 precipitate, and the aqueous solution Q.

[0137] The vacuum distillation plant 62 is an apparatus for vacuum distillation of the aqueous solution Q at a predetermined vacuum distillation temperature and a predetermined vacuum distillation pressure in order to precipitate the soluble solids S.

[0138] The vacuum distillation plant 62 This could be a conventional vacuum distillation apparatus used to precipitate a solution product from a water-based solvent. In the vacuum distillation apparatus 62The vacuum distillation temperature and pressure are adjusted taking into account the sensitivity of the crystal growth of the soluble solids S. Since the soluble solids S mainly contain chloride salts present in the flux F, such as sodium chloride (NaCl) and potassium chloride (KCl), the vacuum distillation temperature is preferably set to 40 to 70 °C, and the vacuum distillation pressure is preferably set to 12 to 40 kPa, but this is not the only possible range.

[0139] When aqueous solution Q is vacuum distilled under a specific temperature and pressure, the concentration of soluble solids S increases as the water contained in the aqueous solution Q evaporates. Once the concentration of soluble solids S reaches saturation, the soluble solids S precipitate from the aqueous solution Q and begin to crystallize. The saturation concentration is not particularly limited. For example, if vacuum distillation is carried out at a vacuum distillation temperature of approximately 65 °C and a vacuum distillation pressure of approximately 27 kPa, the saturation concentration of an aqueous solution Q1 is between 27 and 30%.

[0140] When the aqueous solution Q is vacuum distilled, the aqueous solution Q is separated into the water vapor T, which is evaporated by vacuum distillation, the soluble solids S, which precipitate and crystallize from the aqueous solution Q, and the aqueous solution Q1, in which the non-precipitated soluble solids S are dissolved. In the vacuum distillation apparatus 62 The water vapor T enters the condenser. 64 transferred, and the aqueous solution Q1, in which the precipitated and crystallized soluble solids S are dispersed and precipitated, is transferred to the second centrifugal separator. 66 transferred.

[0141] The capacitor 64 is an apparatus for condensing moisture to produce distilled water D.

[0142] The capacitor 64 Condensed moisture from the vacuum distillation system 62is transferred to produce the distilled water D. The distilled water D is preferably transferred from the condenser. 64 into the first centrifugal separator 56 transferred so that the insoluble solids I are washed separately from the aqueous solution Q with the distilled water D in the first centrifugal separator 56, without being limited thereto.

[0143] The second centrifugal separator 66 is an apparatus for centrifugal separation of the soluble solids S or the aqueous solution Q1, which comes from the vacuum distillation system 62 was convicted.

[0144] The second centrifugal separator 66 preferably a Conturbex centrifuge, but not limited to that. The second centrifugal separator 66The system may include a second filter having a predetermined fourth reference particle diameter, such that the soluble solids S and the aqueous solution Q1 are separated from each other. The second filter is preferably a wire mesh filter, and the fourth reference particle diameter is preferably, but not limited to, 0.05 to 0.3 mm.

[0145] In the second centrifugal separator 66 The soluble solids S and the aqueous solution Q1 are separated centrifugally using the second filter, and then the soluble solids S are transferred to the soluble solids storage unit. 70 transferred and the aqueous solution Q1 is returned to the vacuum distillation system 62 transferred.

[0146] In the vacuum distillation plant 62 The aqueous solution Q1, which is from the second centrifugal separator, will be 66The residue, once transferred back to the source, was subjected again to vacuum distillation at a predetermined temperature and pressure. The vacuum distillation and centrifugal separation processes can be repeated several times. For this purpose, multiple vacuum distillation units can be used. 62 , which have different vacuum distillation temperatures and pressures, are provided and, depending on the process flow, the soluble solids S can be extracted using one of the vacuum distillation systems 62 will be selectively precipitated again.

[0147] This description presents a method for the reprecipitation of soluble solids S from aqueous solution Q1 using the vacuum distillation apparatus. 62 described, but the present invention is not limited thereto. For example, the precipitation unit can 60Furthermore, it contains at least one salt field exposed to sunlight and one salt field with forced evaporation to reprecipitate the soluble solids S from the aqueous solution Q1. Both the sun-exposed salt field and the salt field with forced evaporation can precipitate the soluble solids S from the aqueous solution Q1, which are removed by the second centrifugal separator. 66 was transferred, and the soluble solids S can be placed in the storage unit for soluble solids 70 transfer.

[0148] Fig. Figure 9 is an image showing precipitated and dried soluble solids. Fig. Figure 10 is a SEM-EDS diagram showing the results of the qualitative analysis of the data in Fig. 9 shown soluble solids, and Fig. 11 is a diagram showing the composition ratio of the in Fig. 9 shown soluble solids.

[0149] Next is the storage unit for soluble solids. 70 an apparatus for drying and storing the soluble solids S, which are separated from the second centrifugal separator 66 were transferred.

[0150] The design of the storage unit for soluble solids 70 is not particularly limited. For example, the storage unit for soluble solids 70 a dryer for soluble solids 72 for drying the soluble solids S, and a storage chamber for soluble solids 74 for storing the soluble solids S1, which are in the dryer for soluble solids 72 were dried.

[0151] The dryer for soluble solids 72 is an apparatus for drying the soluble solids S that are separated from the aqueous solution Q1 in the second centrifugal separator 66 were separated.

[0152] The soluble solids S and the aqueous solution Q1 are separated in the second centrifugal separator. 66 Some of the aqueous solution Q1 is separated, but some can be absorbed onto the surfaces of the soluble solids S without being deposited by them. Therefore, the soluble solids S that are separated from the aqueous solution Q1 in the second centrifugal separator are 66 The soluble solids S were separated due to the aqueous solution Q1 absorbed on their surfaces, resulting in a slurry state. However, when the soluble solids S are in a slurry state, they are not easily recycled. To solve this problem, the soluble solids dryer is used. 72 planned.

[0153] In the dryer for soluble solids 72 will be extracted from the second centrifugal separator 66The removed soluble solids S are dried such that they have a moisture content equal to or less than a predetermined reference moisture content. The reference moisture content is preferably about 0.3%, but is not limited to this.

[0154] As in Fig. 9 and Fig. As shown in Figure 10, the dried soluble solids S1 are present in the form of a white powder and mainly contain chloride salts, such as NaCl and KCl. In the soluble solids dryer 72 The dried soluble solids S1 are placed in the storage chamber for soluble solids. 74 transferred.

[0155] The storage chamber for soluble solids 74 is an apparatus for storing the soluble solids S1, from which in the dryer for soluble solids 72 Moisture was removed.

[0156] The storage chamber for soluble solids 74 It can be a conventional storage chamber that can store a storage item. The soluble solids S1, from which the moisture in the soluble solids dryer 72 Once removed, they are placed in the storage chamber for soluble solids. 74 transferred and stored in isolation from the environment. As in Fig. 10 and Fig. Shown in 11, the soluble solids contained in the storage chamber 74 The stored soluble solids S1 mainly consist of chloride salts contained in the flux F and are therefore preferably recycled as the flux F. However, the present invention is not limited to this, and the soluble solids S1 can be recycled in various fields that require mixed salts.

[0157] Next is the aluminum granule storage unit. 80an apparatus for storing the aluminium granulate N, which comes from the crushing / grinding unit 40 is taken away.

[0158] The structure of the aluminum granule storage unit 80 is not particularly limited. For example, as in Fig. 7 shown, the aluminum granule storage unit 80 an aluminum granulate storage chamber 82 containing the aluminium granules N that can be stored in the first separation element 42 and the second separation element 44 was separated and taken away from it.

[0159] Next is the storage unit for insoluble solids. 90 an apparatus for drying and burning the insoluble solids I, which are separated from the first centrifugal separator 56 were transferred, and for storage.

[0160] The design of the storage unit for insoluble solids 90is not particularly limited. For example, the storage unit for insoluble solids 90 a dryer for insoluble solids 92 for drying the insoluble solids I, a combustion furnace for insoluble solids 94 for burning the insoluble solids I1, which are in the dryer for insoluble solids 92 were dried, and a storage chamber for insoluble solids 96 for storing the insoluble solids I2, which are in the incineration furnace for insoluble solids 94 were burned.

[0161] Fig. Figure 12 is an image showing dried insoluble solids.

[0162] The dryer for insoluble solids 92 is an apparatus for drying the insoluble solids I that are separated from the aqueous solution Q in the first centrifugal separator 56 were separated.

[0163] In the first centrifugal separator56 The insoluble solids I are separated by the distilled water D, but some of the distilled water D can be adsorbed onto the surfaces of the insoluble solids I without being separated from them. Consequently, the insoluble solids I that are separated by the first centrifugal separator contain 56 30 to 40% moisture is removed and the solids are present in a slurry state. However, when the insoluble solids are present in a slurry state, transferring and recycling them is not easy. To solve these problems, the dryer for insoluble solids is used. 92 planned.

[0164] In the dryer for insoluble solids 92 will be those from the first centrifugal separator 56The removed insoluble solids S are dried in such a way that the insoluble solids S have a moisture content that is equal to or less than a predetermined reference moisture content.

[0165] The reference moisture content is not particularly limited and is preferably set differently depending on the purpose of recycling the insoluble solids I. For example, if the insoluble solids I are recycled as raw material for cement, the reference moisture content is approximately 40%. If, for example, the insoluble solids I are recycled as refractory brick or ceramic material, the reference moisture content is approximately 0.5%. A relatively low moisture content is required when recycling the insoluble solids I as refractory brick or ceramic material compared to the case of recycling the insoluble solids I as raw material for cement, because a material that burns at approximately 1,200 °C is required.

[0166] As in Fig. As shown in 12, the insoluble solids I1 are in the dryer for insoluble solids 92They were dried and, due to carbon components absorbed onto their surface, are present in the form of a dark gray powder. The insoluble solids I1 are placed in the incinerator for insoluble solids. 94 transferred.

[0167] Fig. 13 is an image showing insoluble solids that have been burned. Fig. Figure 14 is a SEM-EDS diagram showing the results of the qualitative analysis of the data in Fig. 13 shown burnt insoluble solids, and Fig. 15 is a diagram showing the composition ratio of the in Fig. 13 shown are incinerated solids.

[0168] The incinerator for insoluble solids 94 is an apparatus for burning the insoluble solids I1, which is located in the dryer for insoluble solids 92 were dried.

[0169] When aluminum, magnesium, and aluminum alloys in the form of fine powders contained in the dross particle powder P2 are hydrolyzed, aluminum hydroxide, magnesium hydroxide, and aluminum alloy hydrates (hereinafter referred to as 'hydrates') can be produced. Since these hydrates are the insoluble solids I, they are removed from the aqueous solution Q in the first centrifugal separator. 56 separated and placed in the dryer for insoluble solids 92 Since the hydrates are unstable compared to aluminium oxide, magnesium oxide and aluminium alloy oxides (hereinafter referred to as 'oxides'), the insoluble solids I containing the hydrates are not suitable for recycling.

[0170] To solve these problems, it contains, as in Fig. Figure 7 shows the storage unit for insoluble solids. 90 the incineration furnace for insoluble solids 94, in which the insoluble solids I1, which are in the dryer for insoluble solids 92 have been dried, are burned, and hydrates contained in the insoluble solids I1 are converted into oxides.

[0171] In the incineration furnace for insoluble solids 94 The insoluble solids I1 are heated to approximately 800 °C or above, so that the combustion reaction of the hydrates is carried out. The combustion of the hydrates is then continued, so that the hydrates are converted into the oxides. Simultaneously, carbon components adsorbed on the surfaces of the insoluble solids I1 are combusted. As in Fig. 13 shows the insoluble solids I2, which are in the combustion furnace for insoluble solids. 94 It is burned to a light yellow powder. The incinerator for insoluble solids 94transfers the insoluble solids I2 to the storage chamber for insoluble solids 96 .

[0172] Furthermore, the dryer for insoluble solids described above can be dispensed with if the incineration furnace for insoluble solids 94 has a structure that can continuously perform a drying process and a combustion process, such as a microwave combustion oven.

[0173] The storage chamber for insoluble solids 96 is an apparatus for storing the insoluble solids I2, which is used in the incineration furnace for insoluble solids 94 were burned.

[0174] The storage chamber for insoluble solids 96 It can be a conventional storage chamber that can store a storage item. The insoluble solids I2 are incinerated by the insoluble solids combustion furnace. 94 into the storage chamber for insoluble solids96 transferred and stored in isolation from the environment. As in Fig. 14 and Fig. As shown in Figure 15, since the insoluble solids I2 mainly consist of aluminum oxide, magnesium oxide, and aluminum oxide alloys, they are preferably recycled as ceramic material, refractory material, or cement material after an additional recycling process. The additional recycling process for the insoluble solids I2 is not particularly limited. For example, the additional recycling process may include a spinel manufacturing process in which aluminum oxide and magnesium oxide are burned at approximately 2,000 °C and converted into spinel (MgAl2O4).

[0175] Next is the gas storage unit 100 an apparatus for storing the hydrolysis gas G, which is in the gas collector 54 is collected.

[0176] The gas storage unit 100It can be a gas storage chamber, which is generally used to store gas. As in Fig. As shown in section 7, the gas storage unit is located 100 the hydrolysis gas G, which is collected from the gas collector 54 was convicted.

[0177] A general stamp is used to extract the contents of common black mange by applying an exothermic flux, such as sodium nitrate (NaNO3). When the extracted common black mange is decomposed with water, ammonia gas (NH3) and silane gas (SiH4), which are toxic to humans, are produced from the aluminum nitride and aluminum silicate contained in the common black mange. Therefore, it is difficult to recycle the gas produced when the extracted common black mange is decomposed with water.

[0178] On the other hand, the hydrolysis gas G, which is produced when the spherical black scabies B2 is in the black scabies recycling device, contains 3 The gases processed are hydrogen, methane, ethane, ethene, propane, and propene. These gases can be used as energy sources and are non-toxic, unlike the ammonia and silane gas described above, making them easy to recycle. Furthermore, since the majority of the hydrolysis gas G is hydrogen and methane, which have excellent properties as energy sources, the hydrolysis gas G has a very high recycling value.

[0179] The hydrolysis gas G is preferably used as an energy source to drive the system for melting aluminum and recycling black dross. 1According to the present invention, the recycling purpose is not limited to this, however, and the hydrolysis gas G can be transferred to the outside via a gas transfer system and can be recycled as an energy source used in various industrial sectors, such as heating and power generation.

[0180] Furthermore, the black scabies recycling device 3 The above-described spherical black scabies B2 is preferably processed in such a way that it is recyclable, without being limited to recyclability. That is to say, in the black scabies recycling device 3 Can a general black scabies, which is formed in a different way than the spherical black scabies B2, be processed to become recyclable?

[0181] Fig.Figure 16 is a flowchart schematically illustrating the process for melting aluminium and recycling dross according to another preferred embodiment of the present invention. Fig. Figure 17 is a flowchart specifically explaining the step to melt aluminum and the step to crush and grind spherical black dross, which is described in Fig. 16 is specified, and Fig. Figure 18 is a flowchart specifically explaining the step of decomposing scabies powder with water and the step of recycling water-decomposed products, which are in Fig. 16 are specified.

[0182] Referring to Fig.16 comprises the process for melting aluminium and recycling dross according to a preferred embodiment of the present invention (S 100) a step for melting aluminium, (S 200) a step for crushing and grinding the spherical black dross B2 produced when aluminium is melted, (S 300) a step for water decomposing the dross particle powder P2 formed when the spherical black dross B2 is crushed and ground, and (S 400) a step for treating at least one of the water-decomposed products of the dross particle powder P2 so that they are recyclable.

[0183] As in Fig.Figure 17 shows a first step (S 100) for melting aluminum, (S 110) a step for generating the vortex V in the molten aluminum M, (S 120) a step for adding the flux F to the vortex V so that a molten flux layer is formed on the surface of the molten aluminum M, (S 130) a step for adding the aluminum parts A to the vortex V so that the aluminum parts A pass through the molten flux layer, and (S 140) a step for recovering the molten aluminum M in which the aluminum parts A are melted, and the spherical black dross B2 is produced when the aluminum parts A are melted in the molten aluminum M.

[0184] Step (S 110), in which the vortex V is generated in the molten aluminium M, can be carried out by swirling the molten aluminium M using the vortex unit described above. 21is stirred, which can rotate to create the vortex V that spirals down into the molten aluminum M.

[0185] Step (S 120), in which the flux F is added to the vortex V, can be carried out by adding the predetermined flux F to the vortex V that is generated in step (S 110) in the molten aluminum M. Preferably, the flux F can contain 93 to 97 parts by weight of a mixture in which sodium chloride (NaCl) and potassium chloride (KCl) are mixed in equal parts by weight, and 3 to 7 parts by weight of a cryolite (potassium cryolite). More preferably, the flux F can contain 47.5 parts by weight of sodium chloride (NaCl), 47.5 parts by weight of potassium chloride (KCl), and 5 parts by weight of potassium aluminum fluoride (KAlF4). When the flux F is added to the vortex V, the flux F is melted, and the molten flux F floats on the surface of the molten aluminum M to form a molten flux layer, i.e., a molten salt layer.

[0186] Step (S 130), in which the aluminum parts A are added to the vortex V, can be carried out by adding the predetermined aluminum parts A to the vortex V formed in the molten aluminum M, so that the aluminum parts A pass through the molten flux layer formed in step (S 120). Preferably, the aluminum parts A can be aluminum parts from used beverage cans (UBCs, Series 3XXX A and Series 5XXXX A) containing mainly aluminum, magnesium, and aluminum alloys. The aluminum parts A added to the vortex V are melted in the molten aluminum M. Simultaneously, inclusions contained in the molten aluminum M are bound in the molten flux layer, i.e., the flux F, to form the black dross B1.The black scab B1 repeatedly sinks and rises through the vortex V in the molten aluminum M, so that the black scab B1 accumulates into a spherical shape to form the spherical black scab B2.

[0187] Step (S 140), in which the molten aluminium M and the spherical black dross B2 are recovered, can be carried out by passing the molten aluminium M, in which the aluminium parts A have been melted, through the outlets of the aluminium melting furnace described above. 2 is removed, and by removing the spherical black dross B2, which floats on the surface of the molten aluminium M, from the molten aluminium M using the deposition unit described above. 27 is deducted.

[0188] Next, step (S 200), in which the spherical black dross B2 is crushed and ground, includes (S 210) a step for crushing the spherical black dross B2 recovered from the molten aluminium M, (S 220) a step for separating the aluminium granules N and the dross powder P1, (S 230) a step for grinding the dross powder P1, and (S 240) a step for separating the aluminium granules N and the dross particle powder P2.

[0189] Step (S 210), in which the spherical black mange B2 is crushed, can be carried out by crushing the spherical black mange B2 recovered in step (S 140) using the crusher described above. 41 be performed.

[0190] Step (S 220), in which the aluminium granules N and the scabies powder P1 are separated, can be separated by separating the aluminium granules N and the scabies powder P1 into the comminuted products of the spherical black scabies B2 formed in step (S 210) using the first separation element described above. 42 This can be carried out. For example, the first separation element can be 42 a shaking sieve with a particle diameter of approximately 10 mm.

[0191] Step (S 230), in which the scabies powder P1 is ground, can be carried out by grinding the scabies powder P1, which was separated from the aluminium granules N in step (S 220), using the mill 43 be performed.

[0192] Step (S 240), in which the aluminium granules N and the scabies particle powder P2 are separated, can be separated by separating the aluminium granules N and the scabies particle powder P2 into the ground products of the scabies powder P1 formed in step (S 230) using the second separation element described above. 44 This can be carried out. For example, the second separation element can be 44 a drum sieve with a particle diameter of approximately 0.5 mm.

[0193] Furthermore, step (S 200), in which the spherical black dross B2 is crushed and ground, may also include (S 250) a step for recycling the aluminum granules N that were separated from the dross powder P1 and the dross particle powder P2 in steps (S 220) and (S 240). For example, step (S 250), in which the aluminum granules N are recycled, may be carried out by adding the aluminum granules N to the vortex V formed in the molten aluminum M described above.

[0194] Next, step (S 300), in which the scabies particle powder P2 is decomposed with water, can be carried out by decomposing the scabies particle powder P2 with water, which in turn is separated from the aluminium granules N in step (S 240), using the reactor. 52 to be carried out. Preferably in the reactor 52A mixture of scabies particle powder P2 and water, mixed in a 1:2 ratio, is stirred in such a way that the scabies particle powder P2 decomposes with the water. When the scabies particle powder P2 decomposes with water, it breaks down into water-decomposed products containing the hydrolysis gas G, the soluble solids S, and the insoluble solids I.

[0195] Next, as in Fig.Figure 18 shows a step (S 400) in which at least one of the water-decomposed products of the dross particle powder P2 is treated to make it recyclable, (S 410) a step for collecting and separating the hydrolysis gas G from the aqueous solution Q which is generated when the soluble solids S are dissolved in water, (S 420) a step for separating the insoluble solids I and the aqueous solution Q, (S 430) a step for treating the hydrolysis gas G to make it recyclable, (S 440) a step for treating the soluble solids S to make them recyclable, and (S 450) a step for treating the insoluble solids I to make them recyclable.

[0196] Step (S 410), in which the hydrolysis gas G is collected and separated from the aqueous solution Q, can be carried out by collecting the hydrolysis gas G from the aqueous solution Q in the reactor described above. 52is included, using the gas collector 54 is carried out.

[0197] As in Fig. Figure 18 shows step (S 420) in which the insoluble solids I and the aqueous solution Q are separated from each other, (S 421) a step for centrifugal separation of the aqueous solution Q and the insoluble solids I, (S 422) a step for washing the insoluble solids I with distilled water and (S 423) a step for centrifugal separation of the insoluble solids I and the distilled water.

[0198] Step (S 421), in which the insoluble solids I and the aqueous solution Q are separated centrifugally, can be carried out by centrifugal separation of the insoluble solids I and the aqueous solution Q, which is separated from the hydrolysis gas G in step (S 410), using the first centrifugal separator described above. 56 be performed.

[0199] Step (S 422), in which the insoluble solids I are washed with distilled water, can be carried out by washing the insoluble solids I using distilled water in such a way that chlorine, which was absorbed into the insoluble solids I in step (S 421), is deposited from the insoluble solids I. Even after the insoluble solids I and the aqueous solution Q have been deposited in step (S 421), some of the aqueous solution Q may remain undeposited and adsorbed into the insoluble solids I. In this aqueous solution Q, the soluble solids S, which contain chloride salts, are liquefied. Accordingly, to remove chloride salts that have been absorbed into the insoluble solids I, the insoluble solids I are washed with distilled water.Step (S 422), in which the insoluble solids I are washed with distilled water, is preferably carried out using the distilled water D produced in step (S 445), which is described later, but is not limited to it.

[0200] Step (S 423), in which the insoluble solids I and the distilled water are separated centrifugally, can be carried out by centrifugal separation of the insoluble solids I and the distilled water D using the first centrifugal separator described above. 56 to be carried out after step (p. 422).

[0201] Additionally, steps (S 422) and (S 423) can be repeated until the concentration of chloride salts absorbed into the insoluble solids I is less than or equal to a predetermined reference concentration. The reference concentration is preferably about 300 ppm, but is not limited to this.

[0202] As in Fig. Figure 18 shows a step (S 430) in which the hydrolysis gas G is treated to make it recyclable, (S 431) a step for removing the moisture contained in the hydrolysis gas G, (S 432) a step for separating and purifying the hydrolysis gas G from which the moisture has been removed, and (S 433) a step for storing the separated and purified hydrolysis gas G.

[0203] Step (S 431), in which the moisture contained in the hydrolysis gas G is removed, can be carried out by removing moisture contained in the hydrolysis gas G from the gas collector. 54 is collected in step (S 410) using the moisture absorber unit described above. 54b , the moisture removal unit (not shown) and the desulfurization unit (not shown).

[0204] Step (S 432), in which the hydrolysis gas G is separated and purified, can be carried out by separating and purifying the hydrolysis gas G using the gas separation and gas purification unit described above. 54a such that the purity of actually recyclable gas in the hydrolysis gas G, from which moisture was removed in step (S 431), is increased, or specific gas suitable for recycling is separated from other gases in the hydrolysis gas G.

[0205] Step (S 433), in which the hydrolysis gas G is stored, can be replaced by storing the hydrolysis gas G, which was separated and purified in step (S 432), in the gas storage unit described above. 100 be performed.

[0206] As in Fig.Figure 18 includes step (S 440) in which the soluble solids S are treated to make them recyclable, (S 441) a step for vacuum distillation of the aqueous solution Q at a predetermined temperature and pressure to precipitate the soluble solids S from the aqueous solution Q, (S 442) a step for centrifugal separation of the soluble solids S and the aqueous solution Q1, (S 443) a step for drying the soluble solids S, and (S 444) a step for storing the soluble solids S1.

[0207] Step (S 441), in which the aqueous solution Q is vacuum distilled to precipitate the soluble solids S, can be carried out by vacuum distilling the aqueous solution that was centrifugally separated from the insoluble solids I in step (S 421) at a predetermined vacuum distillation temperature and pressure using the vacuum distillation apparatus described above. 62 The vacuum distillation process is preferably carried out at a temperature of 40 to 70 °C and preferably at a vacuum distillation pressure of 12 to 40 kPa, but this is not limited to these values.

[0208] Step (S 442), in which the soluble solids S and the aqueous solution Q1 are centrifugally separated, can be carried out by centrifugally separating the soluble solids S precipitated from the aqueous solution Q in step (S 441) and the aqueous solution Q1 remaining after the soluble solids S were precipitated, using the second centrifugal separator described above. 66 be performed.

[0209] Step (S 443), in which the soluble solids S are dried, can be carried out by drying the soluble solids S, which were centrifugally separated from the aqueous solution Q1 in step (S 442), using the soluble solids dryer described above. 72 Step (S 443) is preferably carried out until the moisture content of the soluble solids S is less than 0.3%, without being limited thereto.

[0210] Step (S 444), in which the soluble solids S1 are stored, can be replaced by storing the soluble solids S1, which were dried in step (S 443), using the soluble solids storage chamber described above. 74 be performed.

[0211] Additionally, step (S 440), in which the soluble solids S are treated to make them recyclable, may also include step (S 445) for condensing the water vapor T generated when the aqueous solution Q is vacuum distilled in step (S 441) to produce the distilled water D. Step (S 445), in which the distilled water D is produced, may be carried out by condensing the water vapor T generated in step (S 441) using the condenser described above. 64 The distilled water D, produced in step (S 445), can be transferred to the first centrifugal separator described above. 56transferred and used when the insoluble solids I are washed in step (S422).

[0212] Additionally, step (S 440), in which the aqueous solution Q is vacuum distilled to precipitate the soluble solids S, can be carried out by vacuum distillation of either the aqueous solution Q, which is centrifugally separated from the insoluble solids I in step (S 421), or the aqueous solution Q1, which is centrifugally separated from the soluble solids S in step (S 442). That is, the aqueous solution Q1 is again transferred to the vacuum distillation apparatus 62 described above (S 446), and a vacuum distillation is carried out again to precipitate the soluble solids S, which have melted in the aqueous solution Q1, for recycling.

[0213] As in Fig.Figure 18 shows step (S 450) in which the insoluble solids I are treated to make them recyclable, step (S 451) for drying the insoluble solids I, step (S 452) for burning the insoluble solids I1 and step (S 453) for storing the insoluble solids I2.

[0214] Step (S 451), in which the insoluble solids I are dried, can be carried out by evaporating moisture that is absorbed into the insoluble solids I without being separated from them in step (S 420), using the insoluble solids dryer described above. 92The following steps are carried out: If the insoluble solids I are recycled as raw material for cement, step (S 451) for drying the insoluble solids I is preferably carried out until the moisture content of the insoluble solids I is less than 40%. If the insoluble solids I are also recycled as raw material for refractory brick or ceramic material, step (S 451) for drying the insoluble solids I is preferably carried out until the moisture content of the insoluble solids I is less than 0.5%, without being limited thereto.

[0215] Step (S 452), in which the combustion of the insoluble solids I1 is carried out, can be replaced by the combustion of the insoluble solids I1, which were dried in step (S 451), using the insoluble solids combustion furnace described above. 94The insoluble solids I1 can contain unstable hydroxides, such as aluminum hydroxide, magnesium hydroxide, and aluminum alloy hydrates. Accordingly, the combustion of the insoluble solids I1 is carried out in such a way that the hydroxides are converted into aluminum oxide, magnesium oxide, and aluminum alloy oxides, which exhibit relatively stable properties.

[0216] Step (S 453), in which the insoluble solids I2 are stored, can be carried out by storing the insoluble solids I2, which are burned in step (S 452), in the storage chamber for insoluble solids described above. 96 be stored.

[0217] Although the present invention has been described by means of the limited examples and figures, it is not intended to be limited by these examples. Those skilled in the art will understand that various modifications, additions, and substitutions are possible without departing from the scope of protection of the invention or from the inventive concept. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 1020150177933

[0002]

Claims

[1] System for melting aluminium and recycling black dross, comprising: an aluminum melting furnace for melting aluminum parts into molten aluminum and a black dross recycling device for recycling black dross that is produced when the aluminum parts are melted into molten aluminum, the aluminium melting furnace includes: a heating chamber equipped with heating units for heating the molten aluminum; and a melting chamber equipped with a vortex unit for generating a vortex that spirals down in the molten aluminum, a flux supply unit for introducing a flux into the vortex, and a raw material supply unit for introducing the aluminum parts into the vortex, wherein, in the vortex unit, black dross, which is formed when inclusions contained in the molten aluminium are bound by the flux, repeatedly sinks and rises through the vortex in the molten aluminium, so that the black dross accumulates into a spherical shape to form a spherical black dross, and The black scabies recycling device is used to recycle the spherical black scabies. [2] System according to claim 1, wherein the black scabies recycling device comprises: a crushing / grinding unit for crushing and grinding the spherical black mange in order to separate the spherical black mange into aluminium granules and mange particle powder; a water decomposition unit for reacting the scabies particle powder with water to decompose the scabies particle powder into soluble solids and insoluble solids; and A precipitation unit for distilling an aqueous solution, which is produced when the soluble solids are dissolved in the water, so that the soluble solids are precipitated from the aqueous solution. [3] System according to claim 2, wherein the black scabies recycling device further comprises: a storage unit for soluble solids for drying and storing the soluble solids that were precipitated in the precipitation unit; an aluminum granulate storage unit for storing the aluminum granules; and a storage unit for insoluble solids for drying and storing the insoluble solids. [4] System according to claim 2, wherein the comminution / grinding unit comprises: a crusher for crushing the spherical black scabies in order to separate the spherical black scabies into aluminium granules and scabies particle powder; and a mill for grinding the scabies powder in order to separate the scabies powder into aluminium granules and the scabies particle powder. [5] System according to claim 4, wherein the comminution / grinding unit further comprises: a first separation element arranged between the crusher and the mill to separate the aluminum granules and the dross powder from each other, to transfer the aluminum granules to the aluminum granule storage unit, and to transfer the dross powder to the mill; and a second separation element, arranged between the mill and the water decomposition unit, to separate the aluminium granules and the dross particle powder from each other, to transfer the aluminium granules to the aluminium granule storage unit, and to transfer the dross particle powder to the water decomposition unit. [6] System according to claim 2, wherein the aluminium parts comprise at least aluminium parts from used beverage cans, and the flux comprises 93 to 97 parts by weight of a mixture in which sodium chloride (NaCl) and potassium chloride (KCl) are mixed in equal parts by weight, and 3 to 7 parts by weight of a cryolite (potassium cryolite). [7] System according to claim 2, wherein the water decomposition unit comprises: a reactor for stirring the scabies particle powder with water; and a first centrifugal separator for centrifugal separation of the aqueous solution and the insoluble solids. [8] System according to claim 7, wherein the precipitation unit comprises: a vacuum distillation apparatus for vacuum distilling the aqueous solution at a predetermined vacuum distillation temperature and a predetermined vacuum distillation pressure in order to precipitate the soluble solids; and a second centrifugal separator for centrifugal separation of the soluble solids precipitated in the vacuum distillation system and the aqueous solution. [9] System according to claim 8, wherein in the first centrifugal separator the insoluble solids separated from the aqueous solution by centrifugation are washed with the distilled water produced by vacuum distillation. [10] System according to claim 2, wherein the water decomposition unit further comprises a gas collector for collecting hydrolysis gas generated when the ragweed particle powder is reacted with water. [11] System according to claim 10, wherein the black scabies recycling device further comprises a gas storage unit for storing the hydrolysis gas which is collected in the gas collector. [12] Methods for melting aluminium and recycling black dross, comprising: (A) a step in which aluminium parts and a flux are added to a vortex formed in molten aluminium to melt the aluminium parts into molten aluminium, and black dross is formed when inclusions contained in the molten aluminium are bound by the flux, repeatedly sinking and rising through the vortex in the molten aluminium, so that the black dross accumulates into a spherical shape to form a spherical black dross; (B) a step to crush and grind the spherical black scabies in order to separate the spherical black scabies into aluminium granules and scabies particle powder; (C) a water decomposition step wherein the scabies particle powder is decomposed in the presence of water, such that the scabies particle powder is decomposed into hydrolysis gas, soluble solids and insoluble solids; and (D) a step to treat at least one type of aluminium granules, hydrolysis gas, soluble solids and insoluble solids so that they are recyclable. [13] The method of claim 12, wherein step (B) comprises: (B1) a step towards crushing the spherical black scabies; (B2) a step to separate the aluminium granules and the scabies powder into crushed products of the spherical black scabies; (B3) a step to grind the scabies powder; and (B4) a step to separate the aluminium granules and the scabies particle powder into ground products of the spherical black scabies. [14] Method according to claim 13, wherein step (D) comprises (D1) a step to melt the aluminium granules to the molten aluminium for recycling. [15] Method according to claim 12, wherein the aluminium parts comprise at least aluminium parts from used beverage cans, and the flux comprises 93 to 97 parts by weight of a mixture in which sodium chloride (NaCl) and potassium chloride (KCl) are mixed in equal parts by weight, and 3 to 7 parts by weight of a cryolite (potassium cryolite). [16] The method of claim 15, wherein step (D) comprises: (D2) a step for collecting and separating the hydrolysis gas; and (D3) a step to separate an aqueous solution which is produced when the soluble solids are dissolved in the water and the insoluble solids. [17] Method according to claim 16, wherein step (D) further comprises (D4) a step for treating the hydrolysis gas so that it is recyclable, where step (D4) includes: (D4a) a step to remove moisture contained in the hydrolysis gas; (D4b) a step for separating and purifying the hydrolysis gas; and (D4c) a step towards storing the hydrolysis gas. [18] Method according to claim 16, wherein step (D) further comprises (D5) a step for treating the soluble solids so that they are recyclable, where step (D5) includes: (D5a) a step to vacuum distill the aqueous solution at a predetermined vacuum distillation temperature and a predetermined vacuum distillation pressure in order to precipitate the soluble solids from the aqueous solution; (D5b) a step to centrifugal separation of the soluble solids and the aqueous solution; (D5c) a step to dry the soluble solids; and (D5d) a step to store the soluble solids. [19] Method according to claim 18, wherein step (D5) further comprises (D5e) a step for condensing water vapor generated when the aqueous solution in step (D5a) is vacuum distilled to produce distilled water, where step (D3) includes: (D3a) a step to centrifugal separation of the insoluble solids and the aqueous solution; (D3b) a step to wash the insoluble solids with the distilled water; and (D3) a step to centrifugal separation of the insoluble solids and the distilled water. [20] Method according to claim 16, wherein step (D) further comprises (D6) a step for treating the insoluble solids so that they are recyclable, where step (D6) includes: (D6a) a step to dry the insoluble solids; (D6b) a step to burn the insoluble solids in order to convert hydrates contained in the insoluble solids into oxides; and (D6c) a step to store the insoluble solids.