Method for treating object to be treated containing blocky copper wire scraps

Abstract

Provided is a processing method capable of suppressing the retention of a block-shaped object to be processed included in the object to be processed. A processing method for processing an object to be processed including a rod-shaped object to be processed and a block-shaped object to be processed, the processing method including: screening the object to be processed using a vibrating screen having a plurality of screens arranged in a conveyance direction while conveying the object to be processed; each screen has a plate-shaped flat portion and a comb-shaped comb-shaped portion, and a plurality of openings are formed by overlapping the comb-shaped portion of each screen with a portion of the flat portion of an adjacent screen located downstream in the conveying direction, except for the screen located most downstream in the conveying direction, and the comb-shaped portion of each screen overlaps with a portion of the flat portion of the adjacent screen located downstream in the conveying direction. When the diameter of the opening is D and the length of the flat part in the conveying direction is L1, the relationship of 2 * D < = L1 < = 10 * D is satisfied, and when the gap between the comb-shaped part and the flat part of the two screens forming the opening is H, the relationship of 0.2 * D < = H < = 0.5 * D is satisfied, and when the screen is used, the gap between the comb-shaped part and the flat part of the two screens forming the opening is H, and when the gap between the comb-shaped part and the flat part is H, the gap between the comb-shaped part and the flat part is H, the gap between the comb-shaped part and the flat part is H, the gap between the comb-shaped part and the flat part is H. Block-shaped objects to be processed among the objects to be processed are collected on a sieve.

Description

Technical Field

[0001] The present invention relates to a method for treating an object to be treated containing massive copper wire chips. Background Art

[0002] In recent years, from the viewpoint of resource conservation, the recovery of valuable metals from waste electrical and electronic equipment components such as waste home appliances / PCs and mobile phones has become increasingly popular, and efficient recovery methods have been studied and proposed.

[0003] For example, in Japanese Patent Laid-Open No. 9-78151 (Patent Document 1), a recycling method for valuable metals from waste materials is disclosed. In this method, waste materials containing valuable metals are charged into a flash smelting furnace for copper ore smelting from the top of the shaft, and the valuable metals are recovered as matte remaining in the furnace. According to the configuration of Patent Document 1, waste treatment is combined with copper smelting using a flash smelting furnace for copper smelting. Therefore, valuable metals can be recovered at low cost even from waste materials with a low valuable metal content rate.

[0004] It has also been proposed to reduce the volume of electronic / electrical equipment component chips by pulverizing them before treating them using a copper smelting flash smelting furnace. For example, in Japanese Patent Laid-Open No. 2015-123418 (Patent Document 2), it is described that electronic / electrical equipment component chips containing copper are incinerated and then pulverized to a size below a specified size, and the pulverized electronic / electrical equipment component chips are treated using a copper smelting furnace.

[0005] In addition, as a type of electronic / electrical equipment component chips containing copper, coated copper wire chips are known. Among these coated copper wire chips, materials with a stable shape and good condition are used as objects for recycling and recovery treatment, and materials with difficult-to-treat shapes and conditions are exported overseas as valuable substances. However, in recent years, difficult-to-treat coated copper wire chips have continued to remain in the country, so there is a need to propose a new method for efficiently treating these difficult-to-treat coated copper wire chips and recovering valuable substances.

[0006] In Japanese Patent Laid-Open No. 2010-236718 (Patent Document 3), an operation method of a gasification melting furnace is disclosed. The method is characterized in that industrial waste charged into a fluidized bed type gasification furnace forms a fluidized bed by air blown in from the lower side, whereby a part of the industrial waste is gasified by thermal decomposition, incombustibles containing valuable metals are recovered, and a part of the thermal decomposition gas generated in the gasification furnace and the incombustibles transported by the thermal decomposition gas are treated using a melting furnace to generate slag. In the operation method of the gasification melting furnace, a residue containing calcium is slurried and blown into the melting furnace.

[0007] As an apparatus for melting industrial waste such as Automobile Shredder Residue (hereinafter also referred to as "ASR") and home appliance shredder residue, which contains metals such as aluminum, iron, copper, zinc, and lead and a chlorine source such as vinyl chloride, a melting treatment facility for industrial waste equipped with a fluidized bed gasifier is known. For example, there is a melting treatment facility disclosed in Japanese Patent Laid-Open No. 11-302748 (Patent Document 4).

[0008] The purpose of the fluidized bed gasifier disclosed in Patent Document 3 is to recover valuable metals contained in the above-mentioned industrial waste.

[0009] Prior Art Documents

[0010] Patent Documents

[0011] Patent Document 1: Japanese Patent Laid-Open No. 9-78151

[0012] Patent Document 2: Japanese Patent Laid-Open No. 2015-123418

[0013] Patent Document 3: Japanese Patent Laid-Open No. 2010-236718

[0014] Patent Document 4: Japanese Patent Laid-Open No. 11-302748 Summary of the Invention

[0015] Problems to be Solved by the Invention

[0016] In a fluidized bed gasifier, the "sand" which is a granular material as a heat medium and is introduced from a heat medium inlet located above it forms a fluidized bed by the air blown upward from air blowing holes provided at the bottom of the furnace. And the sand as a heat medium and the incombustibles (hereinafter also referred to as "gasifier metals") in the waste introduced from above the bottom of the furnace are discharged from the furnace through a discharge chute extending downward from the bottom of the furnace. The discharged gasifier metals and sand are screened by a screening machine, and the sand is re-introduced into the furnace from above the bottom of the furnace again through a circulation path. On the other hand, the gasifier metals are separated by a magnetic separator into large iron filings (gasifier iron metals) and other substances (gasifier non-iron metals), and the gasifier non-iron metals are further screened, thereby being separated into gasifier gold-silver slag containing copper and precious metals under the sieve and gasifier mixed metals containing stainless steel filings and aluminum filings on the sieve. In addition, the sand is pulverized by a pulverizer, and fine iron is recovered in the form of sand iron by a magnetic separator.

[0017] Among the non-ferrous metals of the gasifier after magnetic separation, in addition to aluminum chips, stainless steel chips are also contained. The contents of Cr, Ni, and Al, which are components that impede copper smelting, are high in the stainless steel chips and aluminum chips. Therefore, it is desired to remove them before feeding them into the copper smelting process. Compared with the gasifier gold-silver slag, larger stainless steel chips and aluminum chips are contained in large quantities in the raw materials. Therefore, it is not easy to reduce the size during crushing. Therefore, sieving can be carried out using the holes of perforated metal, etc. It is considered that the reason is that the stainless steel chips and aluminum chips remain on the sieve, and other fine component chips containing copper and precious metals, which are contained in large quantities in the gasifier gold-silver slag; the sand is under the sieve. Thus, stainless steel chips, aluminum chips, etc. from which the sand has been removed can be separated and recovered. It should be noted that in the copper smelting flash smelting furnace, the gasifier gold-silver slag mixed with sand can be accepted.

[0018] Furthermore, most of the copper contained in the gasifier gold-silver slag is recovered in the form of copper wire chips. In these copper wire chips, there are thin linear copper wire chips and block-shaped copper wire chips in which the copper wire chips are wound around each other to form a shape like steel wool. If the block-shaped copper wire chips are hooked on the sieve and remain, then they will be wound around other objects to be processed, clogging the mesh, and the separation accuracy will deteriorate. Therefore, it is necessary to interrupt the sieving process and remove them. Therefore, in order to reduce the interruption of processing and improve productivity, a method for efficiently separating block-shaped copper wire chips is required. In addition, although the above is an example related to copper wire chips, it is not limited to copper wire chips, and there are also such separation problems in objects to be processed containing block-shaped wire chips.

[0019] The present invention has been completed in view of the above problems. In one embodiment, the object is to provide a processing method that can suppress the retention of block-shaped objects to be processed, particularly block-shaped wire chips, contained in the object to be processed. In a preferred embodiment of the present invention, the object is to provide a processing method that can suppress the retention of block-shaped copper wire chips, which is a form of block-shaped wire chips.

[0020] Solutions for solving the problems

[0021] The present inventors conducted in-depth research and as a result, focused on the fact that the shape of the object to be processed has an impact on the retention of block-shaped wire chips. Specifically, it is known that the objects to be processed are roughly linear, plate-shaped, rod-shaped, and block-shaped. In sieving using the holes of perforated metal, etc., the objects to be processed are retained by hooking on the holes. Especially if block-shaped and rod-shaped objects to be processed are hooked on the holes, they also become the cause of the retention of other objects to be processed.

[0022] Therefore, for the purpose of eliminating the cause of the retention of block-shaped objects to be processed, the present inventors focused on a sieve having a structure to which block-shaped objects to be processed are not easily hooked. However, in the case where rod-shaped objects to be processed are also contained in addition to block-shaped objects to be processed, sometimes the rod-shaped objects to be processed stand upright perpendicular or inclined to the holes, causing the block-shaped objects to be processed to be retained.

[0023] Therefore, as described later, it has been found that by making the length of the flat portion of the sieve where there are no openings longer than that of the prior art and setting the gap between the comb-shaped portion adjacent to two sieves and the flat portion within a certain range, the retention of the block-shaped processing object caused by the rod-shaped processing object can be effectively suppressed. The present invention has been completed based on the above insights, and examples are shown below.

[0024] [1] A processing method, characterized in that it is a method for processing a processing object containing a rod-shaped processing object and a block-shaped processing object, and the processing method includes: while conveying the processing object, performing screening using a vibrating sieve having a plurality of sieves arranged in the conveying direction; each sieve has a plate-shaped flat portion and a comb-shaped comb-shaped portion, except for the case of the sieve located at the most downstream in the conveying direction, a plurality of openings are formed by overlapping a part of the comb-shaped portion of each sieve with the flat portion of the adjacent sieve located downstream in the conveying direction. When the aperture of the opening is set as D and the length of the flat portion in the conveying direction is set as L1, the relationship of 2×D ≤ L1 ≤ 10×D is satisfied. When the gap between the comb-shaped portion and the flat portion of the two sieves forming the opening is set as H, the relationship of 0.2×D ≤ H ≤ 0.5×D is satisfied. Through the screening, the block-shaped processing object in the processing object is captured on the sieve.

[0025] [2] The processing method according to [1], wherein the aperture D of the opening is 8 to 20 mm.

[0026] [3] The processing method according to [1] or [2], wherein each sieve further has a lower pendulum portion extending from the flat portion and extending downward toward the opening. When the length of the lower pendulum portion is set as L2, the relationship of 1×D ≤ L2 ≤ 5×D is satisfied.

[0027] [4] The processing method according to any one of [1] to [3], wherein the opening is horseshoe-shaped, trapezoidal, rectangular or triangular.

[0028] [5] The processing method according to any one of [1] to [4], wherein the processing object further contains a linear and / or plate-shaped processing object, and the method further includes: after the screening, screening the processing object on the sieve using a comb-shaped vibrating sieve having a plurality of tooth forks.

[0029] [6] The processing method according to [5], wherein the interval L3 between the plurality of tooth forks is 50 to 150 mm.

[0030] [7] The processing method according to any one of [1] to [6], wherein the raw material of the processing object includes automobile shredding residue, home appliance shredding residue, or electronic / electrical equipment parts scraps.

[0031] [8] The processing method according to [5] or [6], wherein the processing object includes stainless steel chips and / or aluminum chips, and the method includes: recovering the stainless steel chips and / or aluminum chips by screening using the comb-shaped vibrating screen having a plurality of tooth forks.

[0032] [9] A processing method according to any one of [1] to [8], wherein the processing object is automobile crushing residue, home appliance crushing residue, and crushed electronic / electrical equipment parts scraps, which are treated by a gasification melting furnace to remove combustible components such as resin, and then the magnetic material is removed by magnetic separation.

[0033]

[10] The treatment method according to [9], wherein the treatment using the gasification melting furnace is performed under conditions of an air ratio of less than 1 and a temperature of 400 to 600°C.

[0034]

[11] The processing method according to any one of [1] to

[10] , wherein the block-shaped processing object includes block-shaped wire scraps formed by entanglement of wire scraps.

[0035]

[12] The processing method according to any one of [1] to

[11] , wherein the block-shaped processing object includes block-shaped copper wire scraps formed by entanglement of copper wire scraps.

[0036] Effects of the Invention

[0037] According to the present invention, it is possible to provide a processing method capable of suppressing accumulation of bulky processing objects contained in the processing objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structure of the vibration screen in one embodiment of the present invention. Figure 1 (A) is the top view, Figure 1 (B) is a side view.

[0039] Figure 2 This is a schematic diagram of the structure of a comb-shaped vibrating screen having a plurality of tine forks in one embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention is not limited to the following embodiments, and it should be understood that appropriate design changes and improvements can be made based on the general knowledge of those skilled in the art without departing from the gist of the present invention.

[0041] (1. Objects to be processed)

[0042] As the processing object, rod-shaped and block-shaped processing objects are included. In addition, various processing objects including linear and plate-shaped shapes can be used as processing objects. The processing objects of various shapes can be assumed to be metal raw materials, but the specific composition is not limited. In the present embodiment, the block-shaped processing object includes block-shaped wire scraps, especially block-shaped copper wire scraps. In addition, in the present embodiment, the processing object using ASR, household appliance crushing residues or electronic / electrical equipment component scraps as raw materials is described. ASR, household appliance crushing residues, and electronic / electrical equipment component scraps can be processed by gasification melting furnaces, etc. to remove combustible components such as resins after appropriate crushing and sorting, and then magnetic materials such as iron filings can be removed by magnetic sorting, etc. It should be noted that automobiles and household appliances usually contain electronic / electrical equipment, so ASR and household appliance crushing residues may also contain electronic / electrical equipment component scraps. It should be noted that the shapes of the objects to be processed are varied, so there is no strict standard for the above-mentioned rod-shaped and block-shaped shapes. It is generally believed that a rod-shaped shape is hard and not easy to bend, and has an aspect ratio (the ratio of the longest diameter to the shortest diameter measured in three dimensions) of 3 or more, and a block-shaped shape has an aspect ratio of less than 3.

[0043] The object to be processed after the magnetic material is removed may contain stainless steel chips and / or aluminum chips which cannot be completely removed by magnetic separation, and may contain any of Cr, Ni, and Al which are substances that hinder copper smelting. As described later, in some embodiments of the present invention, stainless steel chips and / or aluminum chips can be separated by screening using a comb-shaped vibrating screen having a plurality of teeth.

[0044] In addition, the gasification melting furnace is usually a reducing atmosphere to prevent the rapid combustion of combustible materials, and at the same time, the waste plastics such as resins are thermally decomposed and gasified. In this case, in the internal circulation fluidized bed gasification furnace, the effect of preventing the oxidation of metals such as copper, iron, stainless steel, and aluminum can be expected. Therefore, it can be expected that the separated stainless steel chips and / or aluminum chips are recovered in a state where oxidation is suppressed. The stainless steel chips and / or aluminum chips in a state where oxidation is suppressed are easy to handle, so it is easy to reuse the Fe and Al elements contained therein.

[0045] In this way, it can be expected that oxidation can be suppressed in a reducing atmosphere in a gasification melting furnace. As long as it is a furnace that can perform treatment in a reducing atmosphere, the same effect can be expected. Therefore, the treatment furnace used for gasification treatment of ASR, home appliance crushing residues, and electronic / electrical equipment parts scraps after appropriate crushing and sorting can be any reducing atmosphere, not limited to the gasification melting furnace. The type of reducing atmosphere is also not limited, for example, it can be hydrogen (H2), carbon monoxide (CO), hydrocarbon gas (CH4, C3H8, C4H10 Alternatively, during the gasification process, by setting the air ratio (the ratio of the amount of air theoretically required for complete combustion of the fuel (theoretical air amount) to the amount of air actually fed for combustion) to 1 or less, combustibles such as ASR and household appliance crushing residues are partially burned and thermally decomposed into combustible gas and ash, thereby making the gasifier a highly reducing atmosphere.

[0046] The temperature of the gasification treatment is not particularly limited, but the melting point of aluminum is 660°C, so it is preferably set to 600°C or less, thereby easily suppressing the oxidation of stainless steel chips and / or aluminum chips. However, resin components such as LDPE, HDPE, and PE are generally gasified at 400°C or more, so in order to achieve the purpose of the gasification treatment, the temperature of the gasification treatment is preferably 400°C or more.

[0047] Therefore, in one embodiment of the present invention, the treatment object is a substance that has been subjected to a gasification treatment at an air ratio of 1 or less and a temperature of 400 to 600°C.

[0048] Furthermore, the treatment object may contain valuable metals such as gold, silver, platinum, and palladium in addition to copper.

[0049] Therefore, in one embodiment of the present invention, the processing object includes rod-shaped and block-shaped processing objects, and also includes linear and plate-shaped processing objects. The block-shaped processing object may include block-shaped wire scraps formed by winding wire scraps such as copper wire scraps. In addition, as described later, by using a vibrating screen with multiple screens for screening, the block-shaped processing object is screened onto the screen, and the other linear, rod-shaped, and plate-shaped processing objects are screened onto the screen and under the screen according to the aperture of the screen. In the case where the processing object includes stainless steel scraps and / or aluminum scraps, a large amount of larger stainless steel scraps and / or aluminum scraps are included in the raw material, so the size is not easy to become smaller during crushing, so the stainless steel scraps and aluminum scraps are screened onto the screen together with the block-shaped processing object. In this way, when the processing object on the screen includes stainless steel scraps and / or aluminum scraps, it is further screened by using a comb-shaped vibrating screen with multiple teeth forks, and can be separated into block-shaped processing objects on the screen and stainless steel scraps and / or aluminum scraps under the screen. It should be noted that, in the screening using a vibrating screen, complete separation of the components is impossible, and therefore, in this description, screening of the components does not necessarily mean complete separation.

[0050] (2. Separation of bulk objects)

[0051] As an embodiment of the object to be processed in a block shape, block-shaped wire chips, particularly block-shaped copper wire chips, will be described. Among the copper wire chips, there are thin linear copper wire chips and block-shaped copper wire chips formed by the copper wire chips being wound around each other to form a shape like steel wool. The block-shaped copper wire chips are generally formed by curling linear objects with a thickness of about 0.05 to 0.5 mm into a block shape, and the overall diameter of the block-shaped copper wire chips is larger than the aperture of a normal sieve, and sometimes reaches about 500 mm at most. Therefore, if a normal sieve with multiple openings (for example, perforated metal) is used to screen the object to be processed, the block-shaped copper wire chips will be hooked on the openings of the sieve and stay, and then entangle other objects to be processed. Therefore, it is necessary to interrupt the screening process to remove them.

[0052] As described above, this phenomenon is caused by the rod-shaped object to be processed being hooked on the opening of the sieve and standing upright in the vertical or inclined direction. The rod-shaped object to be processed is typically formed by three-dimensionally curling a metal wire with a thickness of about 0.5 to 2 mm and a length of about 50 to 200 mm. The short diameter of the three-dimensional shape can be about 25 to 100 mm. Therefore, as long as the rod-shaped object to be processed does not enter the opening of the sieve, it will not be hooked on the opening of the sieve. Therefore, a structure in which the rod-shaped object to be processed is not easily inserted into the opening of the sieve is considered. In addition, it is considered that the phenomenon can be improved by using a sieve with a structure in which the rod-shaped object to be processed is not easily hooked. In this embodiment, by using a vibrating sieve with a specific number of sieves for screening the object to be processed, the retention of the block-shaped object to be processed can be effectively suppressed and separation can be carried out.

[0053] Figure 1 Fig. shows a schematic diagram of the structure of the vibrating sieve 1 with a plurality of sieves 11 in an embodiment of the present invention. The sieve 11 has a plate-shaped flat part 111 and a comb-shaped part 112. The plate-shaped flat part 111 is arranged horizontally, and the teeth of the comb-shaped part 112 are arranged in a direction substantially perpendicular to the conveying direction of the object to be processed and extend in the horizontal direction. It should be noted that Figure 1 In Fig., three sieves 11 are shown, but the number of sieves 11 is not limited to this. In addition, in each sieve 11, the number of teeth of the comb-shaped part 112 does not need to be limited to the number shown in the figure.

[0054] For the plurality of sieves 11, except for the case of the sieve 11 located at the most downstream in the conveying direction, a plurality of openings 12 are formed by overlapping a part of the comb-shaped part 112 of each sieve 11 with the flat part 111 of the adjacent sieve 11 located downstream in the conveying direction. Here, the overlap means that in a top view, the comb-shaped part 112 of one sieve 11 is seen to overlap with the flat part of another sieve 11. Through this overlap, the opening 12 is formed.

[0055] It should be noted that although the opening 12 appears as a closed shape in the top view, the comb-shaped portion 112 of one sieve 11 and the flat portion of another sieve 11 do not actually abut (refer to Figure 1 for (B)).

[0056] In the present embodiment, when the length of the flat portion 111 in the conveying direction is set to L1 and the aperture diameter of the opening 12 is set to D, it is important to satisfy the relationship of 2×D ≤ L1 ≤ 10×D. As the reason for the rod-shaped object to be processed to enter the opening of the sieve, it can be considered that during the screening operation, the position of its center of gravity changes, and thus the top end stands up and easily enters the opening of the sieve. If the length L1 of the flat portion 111 is 2×D or more, the change in the position of the center of gravity of the rod-shaped object to be processed is reduced, and it is not easy to enter the opening of the sieve. From this point of view, L1 is preferably 3×D or more, more preferably 4×D or more, and even more preferably 5×D or more.

[0057] On the other hand, if L1 exceeds 10×D, the effect reaches the limit. In order to ensure the length of the flat portion 111, it is necessary to increase the overall size of the device, resulting in an increase in cost. Therefore, the upper limit of L1 is set to 10×D. The upper limit of L1 is preferably 9×D or less, more preferably 8×D or less, and even more preferably 7×D or less.

[0058] It should be noted that the length L1 of the flat portion 111 in the conveying direction refers to the distance in the conveying direction from the upstream end of the flat portion 111 to the upstream end of the comb-shaped portion 112 ( Figure 1 ). When the distance is not fixed, the minimum value thereof is measured as the length L1 of the flat portion 111 in the present embodiment.

[0059] In addition, in the present embodiment, when the aperture diameter of the opening 12 is set to D and the gap between the comb-shaped portion 112 and the flat portion 111 of the two sieves 11 forming the opening 12 is set to H, it is important to satisfy the relationship of 0.2×D ≤ H ≤ 0.5×D. By setting H to 0.2×D or more, the rod-shaped object to be processed is not easily hooked even if it enters the opening 12. As a result, the block-shaped object to be processed is not easily retained. From this point of view, H is preferably 0.25×D or more, more preferably 0.3×D or more.

[0060] On the other hand, when H is greater than 0.5×D, the rod-shaped object to be processed is likely to stand up when entering the opening 12. Therefore, the upper limit of H is set to 0.5×D. The upper limit of H is preferably 0.45×D or less, more preferably 0.4×D or less, and even more preferably 0.35×D or less.

[0061] It should be noted that the aperture diameter D of the opening 12 refers to the diameter of the largest inscribed circle of the opening 12 in the top view. The gap H between the comb-shaped portion 112 and the flat portion 111 of two adjacent sieves 11 refers to the vertical distance between the comb-shaped portion 112 (after removing the thickness of the comb-shaped portion 112 of the sieve 11 on the upstream side) and the flat portion 111 of the sieve 11 on the downstream side( Figure 1 ). It should be noted that when the vertical distance is not fixed, its minimum value is measured as the gap H in this embodiment. In addition, the thickness of the comb-shaped portion 112 of the sieve 11 on the upstream side is not particularly limited as long as it has a thickness sufficient for the weight of the object to be processed.

[0062] The shape of the opening 12 is not particularly limited and may be a horseshoe shape, a trapezoid, a rectangle or a triangle. Here, the shape of the opening 12 refers to the shape surrounded by the contour line of the comb-shaped portion 112 of one sieve 11 and the flat portion 111 of the adjacent sieve 11 downstream in its conveying direction when viewed from the top view. When the contour line of the flat portion 111 is used as the base of the shape, the base is typically a straight line. Here, the horseshoe shape means that the side other than the above base (i.e., the contour line of the comb-shaped portion 112) is an arched curve. When the shape of the opening 12 is set to a trapezoid, a rectangle or a triangle, the shape of the comb-shaped portion 112 can be formed in such a way that they become the chamfered shape.

[0063] It should be noted that as described above, there is a gap H between the comb-shaped portion 112 and the flat portion 111 of two adjacent sieves 11, so the shape of the above opening 12 refers to the projected shape observed from the top view. The aperture diameter D of the opening 12 is also calculated based on the projected shape observed from the top view.

[0064] The aperture diameter D of the opening 12 is preferably 8 to 20 mm. If it is 8 mm or more, the linear object to be processed is likely to fall under the sieve. From this point of view, the aperture diameter D of the opening 12 is more preferably 8 mm or more. If it is 20 mm or less, the block-shaped object to be processed can be captured more efficiently. From this point of view, the aperture diameter D of the opening 12 is more preferably 15 mm or less.

[0065] In a preferred embodiment of the present invention, it is preferred that each sieve 11 further has a lower pendulum portion 113 extending from the flat portion 111 and extending downward toward the opening 12. When the length of the lower pendulum portion 113 is set to L2, the relationship of 1×D≤L2≤5×D is satisfied( Figure 1 of (B)).

[0066] By providing the lower pendulum portion 113 and setting its length L2 to be 1×D or more, even if the rod-shaped object to be processed enters the opening 12, it is not easily hooked, and as a result, the block-shaped object to be processed is not easily retained. On the other hand, when L2 is greater than 5×D, the effect reaches its limit and the device becomes too heavy, so the upper limit of L2 is set to 5×D. The upper limit of L2 is preferably 5×D or less, more preferably 4×D or less, and even more preferably 3×D or less.

[0067] It should be noted that the length L2 of the lower pendulum portion 113 refers to the distance from the upstream end of the lower pendulum portion 113 to the upstream end of the flat portion 111 ( Figure 1 of (B)). When the distance is not fixed, its minimum value is measured as the length L2 of the lower pendulum portion 113 in the present embodiment.

[0068] The angle α between the lower pendulum portion 113 and the extension line of the flat portion 111 is not particularly limited. From the viewpoint of suppressing the hooking of the rod-shaped object to be processed, it is preferably 10° or more. The upper limit of the angle α is not particularly limited and is typically 90° or less.

[0069] In order to screen the object to be processed, during the implementation of the method of the present embodiment, it is necessary to vibrate the vibrating screen 1. The structure for vibrating the screen can be a well-known structure, and the detailed description of the structure and the like is omitted.

[0070] Through the above processing, the hooking of the rod-shaped object to be processed, which is the cause of the retention of the block-shaped object to be processed, is suppressed, and thus the object of the present invention is achieved.

[0071] It should be noted that when the non-ferrous metal of the gasifier is used as the raw material, among the objects to be processed falling from the vibrating screen 1, there are a large amount of stainless steel chips and / or few aluminum chips, and copper and precious metals with few copper smelting hindrance components, so they can be put into copper smelting.

[0072] When the non-ferrous metal of the gasifier is used as the raw material, the object to be processed after separating the stainless steel chips and / or aluminum chips mainly contains sand in addition to copper and precious metals. However, in the copper smelting flash smelting furnace, even if sand is mixed in, it can be accepted, so it can be put into the copper smelting process.

[0073] (3. Separation of rod-shaped or plate-shaped objects to be processed)

[0074] Through the screening of the vibrating screen 1, the object to be processed containing the block-shaped object to be processed remains on the screen, and the linear object to be processed falls below the screen. Among the objects to be processed on the screen, there are also rod-shaped and / or plate-shaped objects to be processed screened according to their sizes. Among these rod-shaped and / or plate-shaped objects to be processed, the content of stainless steel chips and / or aluminum chips is high.

[0075] In order to capture the bulk processing object, especially the bulk copper wire chips containing copper, from the processing objects on the screen and feed them into the copper smelting process, it is necessary to remove the above-mentioned rod-shaped and / or plate-shaped processing objects. Therefore, by using a comb-shaped vibrating screen with multiple tooth forks for screening, the rod-shaped and / or plate-shaped processing objects can be separated.

[0076] Figure 2 Fig. shows a schematic diagram (top view) of the structure of a comb-shaped vibrating screen 2 with multiple tooth forks 21 in an embodiment of the present invention. In this embodiment, the multiple tooth forks 21 are arranged in parallel, with a tapered tip shape, and are oriented in such a way that the long dimension direction is parallel to the conveying direction of the processing object. The cross-sectional shape of the multiple tooth forks 21 in the direction perpendicular to the long dimension direction is not particularly limited and can be any shape including a rectangle, trapezoid, circle, or semi-circle. The interval L3 between the multiple tooth forks 21 is preferably 50 to 150 mm. If it is 50 mm or more, the plate-shaped processing object is likely to fall below the screen. Considering this point, the interval L3 between the multiple tooth forks 21 is more preferably 50 mm or more. If it is 150 mm or less, the bulk copper wire chips can be captured more efficiently. Considering this point, the interval L3 between the multiple tooth forks 21 is not particularly limited and is more preferably 150 mm or less. It should be noted that when the interval L3 between the multiple tooth forks 21 is not fixed, the minimum value of the interval in the direction perpendicular to the conveying direction in the above top view is taken as the interval L3 between the multiple tooth forks 21.

[0077] The length of the multiple tooth forks 21 can be appropriately set according to the conveying speed of the processing object, the required separation accuracy, etc. For example, it can be set to 100 to 300 mm. In addition, if the length of the multiple tooth forks 21 is sufficient, their tips do not need to be connected to each other and can also be open as shown in Figure 2 Fig. In addition, when the tips of the multiple tooth forks 21 are open, in order to maintain the strength, the thickness can be increased, or a reinforcement mechanism (not shown) can be provided below.

[0078] In addition, the comb-shaped vibrating screen 2 with multiple tooth forks 21 can also be arranged directly downstream of the vibrating screen 1 with multiple meshes 11. Thus, the processing object can be processed in a continuous process.

[0079] Regarding the processing object after separating the rod-shaped and / or plate-shaped processing objects, the bulk processing object, especially the bulk copper wire chips containing copper, can be captured, so it can be fed into the copper smelting process.

[0080] It should be noted that the separated stainless steel chips and aluminum chips can be separated and recovered in a state where oxidation is inhibited due to the reducing atmosphere in the gasification treatment.

[0081] Examples

[0082] The present invention will be specifically described below by way of examples, but the description herein is for illustrative purposes only and is not intended to be limiting.

[0083] (Example)

[0084] ASR and home appliance shredder residues are treated in a fluidized bed gasifier, the waste plastics contained are gasified, and the treated objects (gasifier non-ferrous metals) after magnetic separation are used as the treated objects. Figure 1 The vibrating screen 1 shown in the figure is processed. The vibrating screen 1 has 16 screens 11, and the length L1 of the flat part of each screen 11 is 75 mm, the length L2 of the hem 113 is 25 mm, and the angle α is 50°. The screens 11 are arranged in such a way that the gap H between the comb-shaped parts 112 and the flat part 111 of the two screens 11 forming the opening 12 is 4 mm, and the aperture D of the opening 12 is 12 mm. In this embodiment, the shape of the opening 12 is a horseshoe.

[0085] As a result of processing about 10 kg of the processing object, all the block-shaped copper wire scraps were captured on the vibrating screen 1 , and all the linear processing objects fell down without remaining on the vibrating screen 1 .

[0086] Next, the processing object captured on the vibrating screen 1 is processed by Figure 2 The vibrating screen 2 shown in the figure is used for processing. A plurality of tine forks 21 are parallel and spaced 80 to 120 mm apart. Through the processing of the vibrating screen 2, all the blocky copper wire scraps are captured on the vibrating screen 2, and all the rod-shaped and / or plate-shaped processing objects fall down without remaining on the vibrating screen 2.

[0087] It should be noted that, for the vibrating screen 1, the composition of the processing object on the screen and the processing object under the screen is analyzed by the ICP-OES method after alkali dissolution to evaluate the separation rate. Specifically, the processing object other than stainless steel chips contains almost no Cr (usually less than 0.5 weight %), so the total weight of Cr on the screen and under the screen is set to 100%, and the proportion of the Cr weight on the screen is used as the separation rate of stainless steel chips. On the other hand, the processing object other than aluminum chips contains almost no Al, so the total weight of Al on the screen and under the screen is set to 100%, and the proportion of the Al weight on the screen is used as the separation rate of aluminum chips. As a result, the separation rates of stainless steel chips and aluminum chips are more than 90% and more than 40%, respectively.

[0088] In addition, the cut surface of the recycled stainless steel scraps and aluminum scraps was visually checked, and as a result, metallic luster was seen on the fracture surface, confirming that they were almost not oxidized. In addition, Fe and Al elements did not become alloy metals and could be recycled as metals with high resource value.

[0089] (Comparative Example)

[0090] The processing object is set to be the same as that in the embodiment, as a vibrating screen, there are 16 screens 11, the length L1 of the flat part of each screen 11 is 20 mm, the length L2 of the hem part 113 is 50 mm, and the angle α is 37°. The gap H between the comb-shaped parts 112 and the flat part 111 of the two screens 11 forming the opening 12 is 2 mm, and the aperture D of the opening 12 is 18 mm. In this comparative example, the shape of the opening 12 is a horseshoe.

[0091] As a result of the comparative example, a phenomenon occurred in which a part of the rod-shaped processing object was caught in the overlapping portion of the gap H, and the massive copper wire scraps were entangled with the rod-shaped processing object.

[0092] Description of Reference Numerals

[0093] 1: a vibrating screen having a plurality of meshes; 11: a mesh; 111: a flat portion; 112: a comb-shaped portion; 113: a hem portion; 12: an opening; 2: a vibrating screen having a comb-shaped portion having a plurality of tines; 21: a tine.

Claims

1. A processing method, characterized in that, A method for processing an object to be processed including a rod-shaped object to be processed and a block-shaped object to be processed, the processing method includes: while conveying the object to be processed, screening using a vibrating screen having a plurality of sieves arranged in the conveying direction; each sieve has a plate-shaped flat portion and a comb-tooth-shaped portion, except for the sieve located at the most downstream in the conveying direction, a plurality of openings are formed by overlapping the comb-tooth-shaped portion of each sieve with a part of the flat portion of the adjacent sieve located downstream in the conveying direction, when the aperture of the opening is set as D and the length of the flat portion in the conveying direction is set as L1, the relationship of 2×D≤L1≤10×D is satisfied, when the gap between the comb-tooth-shaped portion and the flat portion of the two sieves forming the opening is set as H, the relationship of 0.2×D≤H≤0.5×D is satisfied, through the screening, the block-shaped object to be processed in the object to be processed is trapped on the sieve.

2. The processing method according to claim 1, wherein, the aperture D of the opening is 8 to 20 mm.

3. The processing method according to claim 1 or 2, wherein, each sieve further has a lower pendulum portion extending from the flat portion and extending downward toward the opening, when the length of the lower pendulum portion is set as L2, the relationship of 1×D≤L2≤5×D is satisfied.

4. The processing method according to any one of claims 1 to 3, wherein, the opening is horseshoe-shaped, trapezoidal, rectangular or triangular.

5. The processing method according to any one of claims 1 to 4, wherein, the object to be processed further includes a rod-shaped and / or plate-shaped object to be processed, and the method further includes: after the screening, screening the object to be processed on the sieve using a comb-tooth-shaped vibrating screen having a plurality of tooth forks.

6. The processing method according to claim 5, wherein, the interval L3 of the plurality of tooth forks is 50 to 150 mm.

7. The processing method according to any one of claims 1 to 6, wherein, the raw material of the object to be processed includes automotive shredder residue, household appliance shredder residue or electronic / electrical equipment component chips.

8. The processing method according to claim 5 or 6, wherein, the object to be processed includes stainless steel chips and / or aluminum chips, and the method includes: recovering the stainless steel chips and / or aluminum chips by screening using the comb-tooth-shaped vibrating screen having a plurality of tooth forks.

9. The processing method according to any one of claims 1 to 8, wherein, the object to be processed is a substance obtained by treating automotive shredder residue, household appliance shredder residue, crushed electronic / electrical equipment component chips using a gasification melting furnace to remove combustible components such as resin, and then removing magnetic substances by magnetic separation or the like.

10. The processing method according to claim 9, wherein, the treatment using the gasification melting furnace is carried out under the conditions of an air ratio of 1 or less and a temperature of 400 to 600 °C.

11. The processing method according to any one of claims 1 to 10, wherein, the block-shaped object to be processed includes block-shaped wire chips formed by winding wire chips.

12. The processing method according to any one of claims 1 to 11, wherein the block-shaped object to be processed includes block-shaped copper wire chips formed by winding copper wire chips.

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