Waste treatment system, waste treatment method, and clinker production method

Abstract

To provide a waste treatment system, a waste treatment method, and a clinker production method capable of effectively selecting a chrome-containing object from a waste.SOLUTION: This waste treatment system comprises: a crusher that crushes a waste; a magnetic force selector that separates irons from a crushed object; a selection unit that separates a stainless metal and chrome from a first residue after the separation of the ions from the crushed object; and a heating deionization furnace in which a second residue after the separation of the stainless metal and the chrome from the first residue is heated to generate a deionized object. The selection unit includes a magnetic selector that separates magnetic stainless steel from an object to be selected, and a metal identification selector that separates non-magnetic stainless steel and chrome from the object to be selected. The magnetic selector is configured to feed a treated object after the separation of the stainless steel from the object to be selected to the metal identification selector, or processes the treated object after the separation of the stainless steel and the chrome from the object to be selected by the metal identification selector as the object to be selected.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a waste treatment system, a waste treatment method, and a clinker production method. [Background technology]

[0002] Metals are recovered from waste such as shredder dust, automobile shredder dust, and ordinary waste plastics (here, this refers to ordinary waste plastics other than shredder dust and automobile shredder dust, including, for example, construction waste plastics generated at construction sites and municipal waste), and the plastic materials are used as a thermal energy source in factories and other facilities, thereby reducing the environmental impact and making effective use of the waste. For example, Patent Document 1 discloses a method for recycling shredder dust. In this document, shredder dust may be referred to as "SR" (Shredder Residue). In this document, automobile shredder dust may be referred to as "ASR" (Automobile Shredder Residue). In this document, ordinary waste plastics refer to waste plastics other than SR and ASR (including, for example, construction waste plastics generated at construction sites and municipal waste), and ordinary waste plastics may be referred to as "ordinary waste plastics."

[0003] The recycling method of Patent Document 1 includes heat-treating SR to embrittle it, separating the embrittled SR into small embrittled SR pieces smaller than a predetermined size by sieving or the like, removing magnetic particles from the small embrittled SR using a magnetic separator, and recovering precious metals as heavy products from the small embrittled SR after the magnetic particles have been removed using an air table. After separating the small embrittled SR from the embrittled SR by sieving or the like, the large embrittled SR is separated into metal and residue by a metal separator. The residue is used as a thermal energy source after desalination. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-034143 Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure describes a waste treatment system, a waste treatment method, and a clinker production method that are capable of effectively separating chromium-containing materials from waste. [Means for solving the problem]

[0006] One example of a waste treatment system is a waste treatment system that separates and processes waste to use plastic materials contained in the waste as a thermal energy source, and includes: a crusher configured to crush the waste to produce crushed material; a magnetic separator configured to perform magnetic separation on the crushed material and separate iron from the crushed material; a sorting unit configured to separate stainless metals and chromium from a first residue remaining after the iron from the crushed material has been separated in the magnetic separator; and a thermal desalination furnace configured to heat a second residue remaining after the stainless metals and chromium have been separated from the first residue to produce a desalted material. The sorting unit includes a magnetic separator configured to separate magnetic stainless steel from the stainless metals from the sorting target by magnetic separation or eddy current separation, and a metal identification sorter configured to identify the type of metal from the sorting target and separate non-magnetic stainless steel and chromium from the stainless metals. The magnetic sorting machine is configured to supply the processed product after magnetic stainless steel has been separated from the sorting target to the metal identification sorting machine, or to process the processed product after non-magnetic stainless steel and chromium have been separated from the sorting target by the metal identification sorting machine as the sorting target. [Effects of the Invention]

[0007] According to the waste treatment system, waste treatment method, and clinker production method disclosed herein, it is possible to effectively separate chromium-containing materials from waste. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram schematically illustrating an example of a clinker production facility. [Figure 2] FIG. 2 is a partial cross-sectional view schematically showing an example of a vertical crusher. [Figure 3] FIG. 3 is a diagram showing a schematic diagram of an example of a clinker production facility in which concerns are considered. [Figure 4] FIG. 4 is a table showing an example of the material composition and chromium content of SR and ASR. [Figure 5] FIG. 5 is a graph showing an example of the breakdown of chromium-containing substances in SR and ASR and their chromium contents. [Figure 6] FIG. 6 is a diagram showing an example of the proportion of chromium-containing substances in each sorting step. [Figure 7] FIG. 7 is a diagram schematically illustrating another example of a clinker production facility. [Figure 8] FIG. 8 is a diagram schematically illustrating another example of a clinker production facility. [Figure 9] FIG. 9 is a diagram schematically illustrating another example of a clinker production facility. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the following description, the same elements or elements having the same functions will be designated by the same reference numerals, and redundant explanations will be omitted. Note that in this specification, when referring to the top, bottom, right, and left of a figure, the directions of the reference numerals in the figure will be used as the reference.

[0010] An example of a clinker production facility 1 will be described with reference to Figures 1 and 2. The clinker production facility 1 is part of a cement production facility, and is an apparatus for producing cement clinker W2 (clinker) from cement raw materials W1, as illustrated in Figure 1. The clinker production facility 1 includes a waste treatment system 10 and a kiln facility 2.

[0011] The waste treatment system 10 is configured to process waste W such as SR, ASR, and ordinary waste plastic, recover metals (iron M1, magnetic stainless steel M2 (stainless steel metal), non-magnetic stainless steel M3 (stainless steel metal), and chromium M4) from the waste W, and to sort plastic materials P contained in the waste W. The waste treatment system 10 includes a receiving hopper 11, a vibration sorter 12, a crusher 13, a magnetic sorter 14, a wind sorter 15 (specific gravity difference sorter), a magnetic sorter 16 (sorting section), a metal identification sorter 17 (sorting section), a storage tank 18, a dryer 19, a thermal desalination furnace 20, and a vertical crusher 100.

[0012] The receiving hopper 11 is configured to temporarily store the waste W that has been transported to the clinker production facility 1. The waste W in the receiving hopper 11 is transported to the oscillating sorter 12 by a transport device (e.g., a feeder, a conveyor, etc.) not shown.

[0013] The oscillating sorter 12 is configured to separate the waste W transported from the receiving hopper 11 into light materials D1, heavy materials D2, and fine materials D3. The oscillating sorter 12 may be a so-called ballistic separator that uses characteristics such as differences in shape and specific gravity of the materials contained in the waste W to separate different types of materials by oscillating multiple inclined plates provided inside the main body. The oscillating sorter 12 may also use wind power to sort the waste W. The heavy materials D2 and fine materials D3 separated by the oscillating sorter 12 are each stored separately in storage units not shown. The light materials D1 separated by the oscillating sorter 12 are transported to the crusher 13 by a transport device (e.g., a conveyor) not shown.

[0014] The crusher 13 is configured to crush the lightweight materials D1. The crusher 13 may be, for example, a rotary hammer crusher. In this case, the crusher 13 may be a horizontal type (in which the rotation axis of the hammer extends horizontally) or a vertical type (in which the rotation axis of the hammer extends vertically). The crushed materials D4 crushed in the crusher 13 are transported to the magnetic separator 14 by a transport device (e.g., a conveyor) not shown.

[0015] The magnetic separator 14 is configured to separate the iron particles M1 from the crushed material D4 by magnetic force. The magnetic separator 14 may be a magnetic separator using, for example, a permanent magnet or an electromagnet. The residue D5 remaining after the iron particles M1 have been separated from the crushed material D4 in the magnetic separator 14 is transported to the air separator 15 by a transport device (e.g., a conveyor, etc.) not shown.

[0016] The pneumatic sorter 15 is configured to separate the residue D5 into light products D6 (first residue), foreign matter D7 (heavy products), and large lumps D8 (heavy products). The pneumatic sorter 15 is configured to separate different types of materials by wind power, utilizing characteristics such as differences in specific gravity of the materials contained in the waste W. Various types of pneumatic sorter 15 can be used, such as a blow-up type, a suction type, or a sealed type. After the foreign matter D7 and large lumps D8 have been separated from the residue D5 in the pneumatic sorter 15, the light products D6 are transported to the magnetic sorter 16 by a transport device (e.g., a conveyor) not shown.

[0017] The magnetic separator 16 is configured to separate the magnetic stainless steel M2 from the light products D6. That is, the chromium-containing material contained in the magnetic stainless steel M2 is magnetic. The magnetic separator 16 may be, for example, a magnetic separator configured to perform magnetic separation using a permanent magnet or an electromagnet, or an eddy current separator configured to perform eddy current separation by the action of eddy currents generated in the objects to be separated by electromagnetic induction. The residue D9 remaining after the magnetic stainless steel M2 is separated from the light products D6 in the magnetic separator 16 is transported to the metal identification and sorting machine 17 by a transport device (e.g., a conveyor, etc.) (not shown). When the magnetic separator 16 is a magnetic separator, the magnetic flux density acting on the surface of the objects to be separated by the magnetic separator is set to be greater than the magnetic flux density acting on the surface of the objects to be separated by the magnetic separator 14. When the magnetic separator 16 is an eddy current separator, it can separate not only magnetic stainless steel M2 but also non-magnetic stainless steel M3 and metals such as brass, aluminum, gold, silver, and copper from the separation targets. However, while eddy current separators have the highest separation efficiency for metals such as brass, aluminum, gold, silver, and copper, they tend to have the lowest separation efficiency for non-magnetic stainless steel M3.

[0018] The metal identifying and sorting machine 17 is configured to identify the type of metal from the residue D9 and separate non-magnetic stainless steel M3 and chromium M4 (e.g., chromium-plated items). In other words, chromium-containing materials contained in non-magnetic stainless steel M3 are non-magnetic. The metal identifying and sorting machine 17 may be, for example, a multi-sorter equipped with a magnetic field sensor (such as the "F600" manufactured by EarthTechnica Corporation) or a LIBS sorter that analyzes and sorts the components of the objects using laser-induced breakdown spectroscopy (LIBS). The multi-sorter uses a magnetic field sensor to detect the magnetic field of the objects passing on a belt conveyor, determines their magnetic properties, and then blows compressed air at the objects as they fall from the belt conveyor, scattering them and collecting them into separate containers by type. The LIBS sorter is a solid-state sorting device that continuously irradiates objects passing on a belt conveyor with a laser to generate plasma on the surface of the objects, identifies the type of object by analyzing the optical spectrum emitted from the plasma, and collects the objects into separate containers by type. After non-magnetic stainless steel M3 and chromium M4 are separated from residue D9 in the metal identifying and sorting machine 17, residue D10 (second residue) primarily contains plastic material P and is transported to a storage tank 18 by a transport device (e.g., a conveyor, etc.) (not shown). The metal identifying and sorting machine 17 can also separate magnetic stainless steel M2 from the objects by changing the settings for the target material.

[0019] The storage tank 18 is configured to temporarily store the residue D10. The residue D10 in the storage tank 18 is transported to the dryer 19 by a transport device (for example, a feeder, a conveyor, etc.) not shown.

[0020] The dryer 19 is configured to evaporate the moisture contained in the residue D10 to dry the residue D10. The dryer 19 may completely evaporate the moisture contained in the residue D10, or may evaporate a sufficient amount of moisture to carbonize the residue D10 in the downstream thermal desalination furnace 20. The dryer 19 may employ various methods, such as a method of freeze-drying the target object, a method of drying the target object by blowing hot air onto the target object, or a method of supplying the target object into a processing chamber in a high-temperature atmosphere and drying it. The residue D10 dried by the dryer 19 is transported to the thermal desalination furnace 20 by a transport device (e.g., a conveyor) not shown.

[0021] The thermal desalination furnace 20 is configured to heat the residue D10 in a low-oxygen atmosphere to remove chlorine CL from the residue D10 and soften or embrittle the residue D10 to produce a desalination product D11. The desalination product D11 produced in the thermal desalination furnace 20 mainly contains plastic material P, similar to the residue D10, and is transported to the vertical crusher 100 by a transport device (e.g., a conveyor) not shown. The desalination product D11 may be a carbonized product obtained by completely carbonizing the residue D10, or a semi-carbonized product obtained by partially carbonizing the residue D10 after the reaction has ended while leaving some carbonizable portions (organic matter) remaining.

[0022] The thermal desalination furnace 20 may heat the residue D10 for two hours or more at a temperature of, for example, about 250°C to 450°C. In this case, the plastic material P constituting the residue D10 tends to become sufficiently embrittled, and the desalted matter D11 (plastic material P) tends to be effectively crushed in the downstream vertical crusher 100. The heating temperature of the residue D10 in the thermal desalination furnace 20 may be, for example, about 310°C to 360°C.

[0023] Granular or powdered auxiliary material C may be fed into the thermal desalination furnace 20 together with the residue D10. Examples of auxiliary materials include a combustion improver, a chlorine immobilization agent, a grinding aid, and an anti-fusing agent. Adding an anti-fusing agent to the thermal desalination furnace 20 can prevent melted plastics from fusing together and from adhering to the interior of the furnace. The anti-fusing agent may be, for example, pulverized coal or coal. Adding a chlorine immobilization agent to the thermal desalination furnace 20 can immobilize chlorine CL generated from the chlorine-containing plastic material P.

[0024] The vertical crusher 100 is configured to crush the desalted material D11 into, for example, fine powder to produce crushed material D12. As illustrated in FIG. 2 , the vertical crusher 100 includes power sources 110 and 120, a lower casing 130, an upper casing 140, a rotary table 150, a crushing section 160, and a separator 170.

[0025] The power source 110 includes a motor 111 and a reducer 112. The motor 111 is configured to rotate the rotary table 150 around a vertical axis via the reducer 112. The power source 120 includes a motor 121, a rotary cylinder 122, and a belt 123. The motor 121 is configured to rotate the rotary cylinder 122 around the vertical axis via the belt 123.

[0026] The rotating shell 122 extends vertically. The rotating shell 122 is rotatably attached to a top 142 (described later) of the upper casing 140 via a bearing 142b (described later). A supply pipe 124 extends along the interior of the rotating shell 122. The lower end of the supply pipe 124 is located above the center of the turntable 150. Therefore, the desalted material D11 supplied from the thermal desalination furnace 20 through the supply pipe 124 is discharged to the center of the turntable 150.

[0027] Belt 123 is stretched between a pulley attached to the rotating shaft of motor 121 and a pulley attached to the upper end of rotating barrel 122. In this way, the rotational force of motor 121 is transmitted to rotating barrel 122 by belt 123.

[0028] The lower casing 130 is installed on a foundation 130a such as the ground or an installation stand. The lower casing 130 includes a base portion 131 and a tubular portion 132. The base portion 131 is configured to accommodate, for example, the reducer 112, the lower portion of the grinding portion 160, the duct H1, the discharge pipe H2, and the like.

[0029] The duct H1 is a flow path for introducing heated gas from a gas supply unit (not shown) into the vertical crusher 100. The heated gas introduced from the duct H1 rises through the lower casing 130 and the upper casing 140, and then is discharged from a duct 143 (described later) of the upper casing 140.

[0030] The discharge pipe H2 is a flow path for discharging the desalted material D11 that has not been sufficiently pulverized in the pulverizing section 160 and has fallen from the rotary table 150 to the outside of the vertical crusher 100. The desalted material D11 discharged from the discharge pipe H2 may be discharged again onto the rotary table 150 via the supply pipe 124.

[0031] The cylindrical portion 132 is integrally connected to the upper end of the base portion 131 and has a cylindrical shape. The cylindrical portion 132 is configured to accommodate the rotary table 150, the upper portion of the crushing portion 160, the lower portion of the separator 170, etc.

[0032] The upper casing 140 includes a tubular portion 141, a top portion 142, and a duct 143. The tubular portion 141 is attached to the upper end of the tubular portion 132 and has a tubular shape. The tubular portion 141 is configured to accommodate the upper portion of the separator 170 and the like.

[0033] The top portion 142 is integrally connected to the upper end of the cylindrical portion 141, and closes the upper opening of the cylindrical portion 141. A bearing 142b is provided on the top wall of the top portion 142 so as to extend along the vertical direction.

[0034] Duct 143 extends outward from the side wall or upper portion of top 142 and is cylindrical. Duct 143 is connected to burner 2b of kiln body 2a and / or a burner of the calciner (described later). Duct 143 is a flow path for sending pulverized material D12, which is obtained by pulverizing desalted material D11 in vertical pulverizer 100, and heating gas supplied from the gas supply unit into vertical pulverizer 100, to burner 2b of kiln body 2a and / or a burner of the calciner.

[0035] The rotary table 150 is configured to receive the desalted material D11 discharged from the lower end of the supply pipe 124 and to transfer the desalted material D11 to the outer periphery by centrifugal force generated by the rotation of the rotary table 150.

[0036] The crushing unit 160 is disposed near the outer periphery of the turntable 150. The vertical crusher 100 may include a plurality of crushing units 160. In this case, the plurality of crushing units 160 may be disposed at the outer periphery of the turntable 150 at approximately equal intervals along the outer periphery of the turntable 150.

[0037] The crushing unit 160 includes a crushing roller 161, a holding unit 162, an arm 163, and a hydraulic cylinder 164. The crushing roller 161 is rotatably attached to the holding unit 162. The crushing roller 161 may have, for example, a truncated cone shape. The crushing roller 161 is disposed so that its peripheral surface faces the outer periphery of the turntable 150. The crushing roller 161 rotates in response to the rotation of the turntable 150.

[0038] The crushing roller 161 is configured to apply pressure to the desalted material D11 that has entered the gap between the peripheral surface of the crushing roller 161 and the outer periphery of the rotary table 150, thereby crushing the desalted material D11. The crushed desalted material D11 is dried while being blown up by the heated gas introduced from the duct H1, and after rising through the lower casing 130 and the upper casing 140 along with the heated gas, is introduced into the separator 170. The heated gas accompanying the crushed desalted material D11 is sometimes referred to as a "solid-gas two-phase flow."

[0039] The holder 162 is configured to rotate the crushing roller 161 around an axis that extends horizontally along the tangential direction of the rotary table 150. The arm 163 connects the holder 162 and the hydraulic cylinder 164.

[0040] The hydraulic cylinder 164 is configured to extend and retract a piston rod. An arm 163 is connected to the tip of the piston rod. Therefore, when the hydraulic cylinder 164 extends and retracts the piston rod, the crushing roller 161 swings toward or away from the upper surface of the turntable 150 via the holding portion 162 and the arm 163. This changes the distance between the peripheral surface of the crushing roller 161 and the outer periphery of the turntable 150, changing the pressure applied to the desalted material D11 and adjusting the particle size of the crushed material D12.

[0041] The separator 170 includes a rotating rotor 171, a plurality of fixed blades 172, and a cone 173. The rotating rotor 171 is attached to the rotating barrel 122 and is configured to rotate together with the rotating barrel 122. The rotating rotor 171 includes a plurality of blade members 171a extending in the vertical direction. When viewed from above, the plurality of blade members 171a are arranged in a circular shape at approximately equal intervals around the rotation axis of the rotating rotor 171 (rotating barrel 122). Therefore, slit openings OP1 extending in the vertical direction are formed between the plurality of blade members 171a.

[0042] The pulverized material D12 produced by the pulverization of the desalted material D11 by the pulverizer roller 161 is classified into a predetermined particle size according to the rotation speed of the rotor 171, based on the balance between the centrifugal force of the swirling flow generated around the rotor 171 as the rotor rotates and the airflow attempting to pass through the slit opening OP1. Relatively fine particles of the pulverized material D12 that pass through the slit opening OP1 and enter the interior of the rotor 171 are discharged from the duct 143 accompanied by the heated gas and sent to the burner 2b of the kiln body 2a and / or the burner of the calciner. On the other hand, relatively coarse particles of the pulverized material D12 that cannot pass through the slit opening OP1 are repelled outward by the centrifugal force.

[0043] The plurality of fixed vanes 172 are arranged on the outer periphery of the rotating rotor 171. The plurality of fixed vanes 172 are fixed near the boundary between the tubular portion 141 and the top portion 142 of the upper casing 140 via, for example, an annular (ring-shaped) plate member 174. The plate member 174 is configured to prevent the gas-solid two-phase flow from flowing from the tubular portion 141 to the top portion 142 without passing through the separator 170 (so-called short-path flow).

[0044] When viewed from above, the multiple fixed vanes 172 are arranged in a circle at approximately equal intervals around the rotation axis of the rotating rotor 171 (rotating cylinder 122) while being inclined at a predetermined angle with respect to an imaginary line in the radial direction. Therefore, slit openings OP2 extending in the vertical direction are formed between the multiple fixed vanes 172. The multiple fixed vanes 172 impart a swirl to the gas-solid two-phase flow when the solid-gas two-phase flow passes through the slit openings OP2, thereby forming a swirling flow of the gas-solid two-phase flow.

[0045] The cone 173 has a funnel shape that narrows downward. The upper end of the cone 173 is connected to the lower ends of the multiple fixed blades 172. The cone 173 is positioned so as to surround the lower part of the supply pipe 124 from the outside. Therefore, the relatively coarse particles of the pulverized material D12 that are bounced off the rotating rotor 171 fall through the space between the inner peripheral surface of the cone 173 and the outer peripheral surface of the lower part of the supply pipe 124, and are discharged from the opening at the lower end of the cone 173 to the center of the turntable 150. As a result, the relatively coarse particles of the pulverized material D12 are again subjected to pulverization by the pulverizing roller 161.

[0046] Returning to FIG. 1 , the kiln equipment 2 includes a kiln body 2a and a burner 2b provided in front of the kiln body 2a. The kiln equipment 2 is configured to burn pulverized material D12 supplied to the burner 2b, thereby burning the cement raw material W1 fed from the kiln bottom of the kiln body 2a and producing cement clinker W2. In other words, the pulverized material D12 is used as a thermal energy source for burning the cement raw material W1. In addition, the pulverized material D12 fed into the kiln body 2a via the burner 2b is also used as part of the cement raw material W1. The kiln body 2a may be, for example, a rotary kiln extending horizontally.

[0047] The kiln equipment 2 may further include a suspension preheater (not shown) provided at the end of the kiln body 2a. The suspension preheater is configured to preheat the cement raw materials W1 using heat generated in the kiln body 2a. The kiln equipment 2 may further include a calciner (not shown) disposed between the end of the kiln body 2a and the suspension preheater. The calciner is configured to calcinate the cement raw materials W1 preheated by the suspension preheater. The pulverized material D12 generated in the vertical pulverizer 100 may be supplied to a burner (not shown) of the calciner. That is, the pulverized material D12 may be used as a thermal energy source for calcining the cement raw materials W1.

[0048] [Effect] As mentioned above, efforts to achieve carbon neutrality have been underway to recover metals from waste materials (W), such as SR, ASR, construction waste plastics, and municipal waste, and use the resulting plastic materials (P) as a thermal energy source in factories and other facilities. For example, when plastic materials (P) sorted from waste materials (W) are used in a cement factory (clinker production facility 1), the plastic materials (P) are fed into kiln facility 2 and used as part of the cement raw materials (W1) and also as a thermal energy source for burning the cement raw materials (W1). However, waste materials (W) contain various foreign matter. SR and ASR, in particular, contain large amounts of metals (e.g., iron (M1), magnetic stainless steel (M2), non-magnetic stainless steel (M3), chromium (M4), etc.). Therefore, if foreign matter and metals are not sufficiently recovered from waste materials (W) through sorting processes, the following concerns arise.

[0049] (Concern 1) Chromium-containing materials in the waste W may be brought into the clinker manufacturing facility 1, increasing the chromium content in the cement. This may affect the quality of the cement.

[0050] (Concern 2) According to the "Guidelines for Water-Soluble Hexavalent Chromium Content in Cement" established by the Japan Cement Association, the chromium content in cement must not exceed the specified control standard. Therefore, there is a concern that the amount of SR and ASR that can be used may be restricted when separating plastic material P from SR and ASR and using it as a thermal energy source.

[0051] (Concern 3) If metals are not sufficiently recovered from the waste W, there is a concern that the metals may come into contact with or collide with subsequent structures (e.g., devices, equipment, etc.), causing wear and damage to the subsequent structures and requiring frequent repairs. For example, in the case of the clinker production facility 1, wear and damage are likely to occur inside the vertical pulverizer 100 (e.g., the rotary table 150, the pulverizer roller 161, the blade member 171a, the fixed blade 172, etc.), the injection line from the vertical pulverizer 100 to the burner 2a of the kiln facility 2, the injection line from the vertical pulverizer 100 to the burner of the calciner, etc.

[0052] (Concern 4) Chromium-containing materials can take various forms, such as non-magnetic materials like chrome plating, or non-magnetic or weakly magnetic materials like stainless steel. Therefore, completely eliminating chromium-containing materials typically requires the use of multiple sorting machines, such as magnetic separators, eddy current separators, and electromagnetic induction separators, in multiple stages. Furthermore, magnetic separators require a strong magnetic flux density. This increases the complexity and size of the sorting equipment, raising concerns about increased operating costs.

[0053] (Concern 5) Of the metals recovered from waste W, iron M1 can be sold as a valuable resource. Therefore, it is conceivable to separate the metals contained in waste W into iron M1 and other metals. However, if the magnetic flux density of the magnetic separation for recovering iron M1 is too small, there is a concern that the recovery rate of iron M1 will decrease. On the other hand, if the magnetic flux density of the magnetic separation for recovering iron M1 is too large, there is a concern that not only iron M1 but also metals other than iron M1 and plastic material P bonded to the metals will be recovered.

[0054] The present inventors have conducted extensive research into the above concerns and have discovered factors that lead to insufficient recovery of chromium-containing materials from the waste W. The research conducted by the present inventors will be described below with reference to FIGS. 3 to 6. The research described below was carried out using a clinker production facility 1A illustrated in FIG. 3. The clinker production facility 1A has the same configuration as the clinker production facility 1 illustrated in FIG. 1, except that it does not include a magnetic separator 16 and a metal identifying separator 17.

[0055] (Study 1) Identification of chromium-containing materials brought into the waste treatment system 10 First, using SR and ASR as waste W, a quantitative analysis of the chromium content was carried out on the pulverized material D12 fed into the kiln facility 2. As a result, it was found that the pulverized material D12 contained approximately 100 mg / kg to 1660 mg / kg of chromium.

[0056] Next, the origin of chromium was investigated using SR and ASR as waste W. Specifically, SR (1 sample) and ASR (2 samples) in the light product D6 before treatment in the thermal desalination furnace 20 were sieved (mesh opening: 5 mm). Next, the over-sieved fraction (residue that did not pass through the sieve) was manually separated into the following categories: 1) Metal (stainless steel) 2) Metal (aluminum) 3) Wire 4)Electric wire 5) Hard plastic 6) Soft plastic, rubber pieces, paper 7) Sponge 8) Cloth-like material 9) Hard plastic + plating 10) Dust 11) Other (glass fragments, etc.)

[0057] Next, the chromium content (ratio of chromium content to the weight of the separated material) of each separated material was measured using a handheld XRF (X-ray fluorescence analyzer). The measurement results are shown in Figure 4. Figure 4 shows that chromium was found to be contained in 1) metal (stainless steel), 3) wire, and 9) hard plastic + plating. It was found that chromium was particularly concentrated in 1) metal (stainless steel).

[0058] (Study 2) Identification of chromium-containing substances that contribute significantly to the introduction of chromium into the waste treatment system 10 Using 1) metal (stainless steel) and 2) hard plastic with plating in Study 1, we investigated chromium-containing materials that contribute significantly to the introduction of chromium into the waste treatment system 10. Specifically, SR and ASR samples were collected eight times from the light product D6 after drying in the dryer 19 and before treatment in the thermal desalination furnace 20, yielding samples a–h. The chromium-containing materials from which the chromium originated were identified for each sample a–h, and their chromium content was measured using a handheld XRF (X-ray fluorescence analyzer). The results are shown in Figure 5. Figure 5 reveals that most of the chromium in the light product D6 originated from stainless steel, with magnetic stainless steel contributing significantly. The metal content in the light product D6 after drying ranged from 0.43% to 1.60% by mass.

[0059] (Study 3) Identifying the proportion of chromium-containing substances in each sorting process The proportion of chromium-containing materials in each sorting process was investigated. Specifically, using SR and ASR as waste W, the waste W in the receiving hopper 11, the magnetically separated material after magnetic separation by the magnetic separator 14, the heavy product after air separation by the air separator 15, the light product D6 after drying by the dryer 19, and the mill waste stone discharged from the vertical crusher 100 were each separated into magnetic stainless steel, non-magnetic stainless steel, and chrome plating, and the proportion of each chromium-containing material was calculated. The results are shown in Figure 6.

[0060] According to Figure 6, the waste W in the receiving hopper 11 contained 93% magnetic stainless steel, 6% non-magnetic stainless steel, and 1% chrome-plated steel. The magnetically separated material after magnetic separation by the magnetic separator 14 contained 100% magnetic stainless steel, 0% non-magnetic stainless steel, and 0% chrome-plated steel. The light product D6 after drying by the dryer 19 contained 71% magnetic stainless steel, 28% non-magnetic stainless steel, and 1% chrome-plated steel. The mill waste discharged from the vertical crusher 100 contained 81% magnetic stainless steel, 19% non-magnetic stainless steel, and 0% chrome-plated steel. From the above, it was confirmed that there was magnetic stainless steel that had not been recovered by the magnetic separator 14.

[0061] Furthermore, when the proportion of magnetic stainless steel in the light product D6 after drying in the dryer 19 was compared with the proportion of magnetic stainless steel in the mill waste stone discharged from the vertical crusher 100, it was confirmed that the proportion of magnetic stainless steel had increased in the latter. The detailed mechanism behind this is not entirely clear, but it is thought that the heating in the thermal desalination furnace 20 and / or the pressurization in the vertical crusher 100 may have transformed some of the non-magnetic austenitic stainless steel into magnetic stainless steel (ferritic, martensitic).

[0062] (Summary of the review) As a result of the above studies 1 to 3 by the present inventors, the present inventors have found the following for the first time. -Chromium is mainly derived from metal (stainless steel). -Magnetic stainless steel contributes significantly. - There is magnetic stainless steel that has not been recovered in the magnetic separator 14. There is a possibility that non-magnetic stainless steel may have been transformed into magnetic stainless steel through processing in the thermal desalination furnace 20 and the vertical crusher 100.

[0063] Furthermore, based on the above studies 1 to 3, the inventors have discovered that by separating the residue remaining after iron M1 has been separated from the waste W by the magnetic separator 14 using a magnetic separator 16 and a metal identification separator 17, chromium-containing materials (magnetic stainless steel M2, non-magnetic stainless steel M3, chromium M4) can be effectively separated from the waste W.

[0064] That is, according to the above example, after the iron group M1 is separated from the crushed material D4 by the magnetic separator 14, the stainless steel metals and chromium are separated from the light products D6 and the residue D9 by the magnetic separator 16 and the metal identifying and sorting machine 17, respectively. That is, chromium-containing materials tend to be concentrated in the materials recovered by the magnetic separator 16 and the metal identifying and sorting machine 17. Therefore, the chromium-containing materials can be effectively sorted by the magnetic separator 16 and the metal identifying and sorting machine 17.

[0065] According to the above example, metal waste (iron M1, magnetic stainless steel M2, non-magnetic stainless steel M3, and chromium M4) is sorted in stages, so the sorting process is completed on the same line. In other words, no separate sorting process is required for the iron M1 collected by the magnetic separator 14, the magnetic stainless steel M2 collected by the magnetic separator 16, and the non-magnetic stainless steel M3 and chromium M4 collected by the metal identification separator 17. This makes it possible to simplify the waste treatment system 10 for sorting the waste W. This effect is particularly noticeable when sorting SR and ASR, which are prone to entanglement with metals and plastic materials and can be time-consuming to separate.

[0066] According to the above example, metal waste is collected by the magnetic separator 14, the magnetic separator 16, and the metal identifying and separating machine 17. This makes it difficult for metals to reach subsequent structures (for example, the interior of the vertical crusher 100, the injection line from the vertical crusher 100 to the burner 2b of the kiln body 2a, the injection line from the vertical crusher 100 to the burner of the calciner, etc.). This makes it possible to suppress wear and damage to subsequent structures.

[0067] According to the above example, the light product D6 separated from the residue D5 by the air separator 15 is processed by the magnetic separator 16 and the metal identifying separator 17 to separate the magnetic stainless steel M2, non-magnetic stainless steel M3, and chromium M4 from the light product D6. This prevents the operation of the magnetic separator 16 and the metal identifying separator 17 from being affected by contact or collision with the foreign matter D7 and the large lump D8 (heavy product). Furthermore, the magnetic separator 16 and the metal identifying separator 17 do not need to be large in size in order to separate the magnetic stainless steel M2, non-magnetic stainless steel M3, and chromium M4 contained in the foreign matter D7 and the large lump D8 (heavy product). This allows the magnetic separator 16 and the metal identifying separator 17 to more effectively separate chromium-containing materials.

[0068] [Variations] The disclosure in this specification should be considered to be illustrative in all respects and not restrictive. Various omissions, substitutions, modifications, etc. may be made to the above examples without departing from the scope and spirit of the claims.

[0069] (1) As illustrated in FIG. 7, in a waste treatment system 10, a magnetic separator 16 may be disposed downstream of a metal-identifying separator 17. That is, the metal-identifying separator 17 may separate non-magnetic stainless steel M3 and chromium M4 from light products D6 separated from residue D5 by an air separator 15. The magnetic separator 16 may separate magnetic stainless steel M2 from residue D13 remaining after the non-magnetic stainless steel M3 and chromium M4 have been separated from light products D6 by the metal-identifying separator 17. The residue D14 remaining after the magnetic stainless steel M2 has been separated from residue D13 by the magnetic separator 16 mainly contains plastic material P and is sequentially processed in a storage tank 18, a dryer 19, and a thermal desalination furnace 20. The configuration illustrated in FIG. 7 provides the same effects as the configuration illustrated in FIG. 1.

[0070] (2) In the examples of Figures 1 and 7, the magnetic separator 16 and / or the metal identification separator 17 may be disposed between the magnetic separator 14 and the thermal desalination furnace 20. That is, the magnetic separator 16 and / or the metal identification separator 17 may be disposed between the magnetic separator 14 and the air separator 15, or between the air separator 15 and the thermal desalination furnace 20.

[0071] (3) As illustrated in FIGS. 8 and 9, in the waste treatment system 10, a magnetic separator 16 and a metal identification separator 17 may be disposed downstream of the thermal desalination furnace 20.

[0072] According to the example of Fig. 8, a metal identifying and separating machine 17 is disposed downstream of the magnetic separator 16. That is, the magnetic separator 16 may separate magnetic stainless steel M2 from the desalted material D11 produced in the thermal desalting furnace 20. The metal identifying and separating machine 17 may separate non-magnetic stainless steel M3 and chromium M4 from the residue D15 remaining after the magnetic stainless steel M2 has been separated from the desalted material D11 in the magnetic separator 16. The vertical crusher 100 may crush the residue D16 remaining after the non-magnetic stainless steel M3 and chromium M4 have been separated from the residue D15 in the metal identifying and separating machine 17 to produce crushed material D12.

[0073] According to the example of FIG. 9, a magnetic separator 16 is disposed downstream of the metal identifying and separating machine 17. That is, the metal identifying and separating machine 17 may separate non-magnetic stainless steel M3 and chromium M4 from the desalted material D11 produced in the thermal desalting furnace 20. The magnetic separator 16 may separate magnetic stainless steel M2 from a residue D17 remaining after the non-magnetic stainless steel M3 and chromium M4 have been separated from the desalted material D11 in the metal identifying and separating machine 17. The vertical crusher 100 may crush a residue D18 remaining after the magnetic stainless steel M2 has been separated from the residue D17 in the magnetic separator 16 to produce crushed material D12.

[0074] 8 and 9, after the iron group M1 is separated from the crushed material D4 by the magnetic separator 14, the stainless steel metals and chromium are separated from the desalted material D11 by the magnetic separator 16 and the metal identifying and sorting machine 17, respectively. That is, chromium-containing materials tend to be concentrated in the materials recovered by the magnetic separator 16 and the metal identifying and sorting machine 17. Therefore, the chromium-containing materials can be effectively sorted by the magnetic separator 16 and the metal identifying and sorting machine 17.

[0075] According to the embodiment illustrated in Figures 8 and 9, metal waste (iron M1, magnetic stainless steel M2, non-magnetic stainless steel M3, and chromium M4) is sorted in stages, so the sorting process is completed on the same line. In other words, no separate sorting process is required for the iron M1 collected by the magnetic separator 14, the magnetic stainless steel M2 collected by the magnetic separator 16, and the non-magnetic stainless steel M3 and chromium M4 collected by the metal identification separator 17. This makes it possible to simplify the waste treatment system 10 for sorting the waste W. This effect is particularly noticeable when sorting SR and ASR, which are prone to entanglement with metals and plastic materials and can be time-consuming to separate.

[0076] 8 and 9, the desalted material D11, which has been brittle by heating the light product D6, is subjected to a separation process for stainless metals and chromium using the magnetic separator 16 and the metal identifying and sorting machine 17. This makes it easier to separate stainless metals and chromium from the brittle desalted material D11 in the magnetic separator 16 and the metal identifying and sorting machine 17. This makes it possible to further increase the recovery rate of chromium-containing materials from the waste W.

[0077] 8 and 9, the vertical crusher 100 is disposed downstream of the magnetic separator 16 and the metal identifying separator 17. Therefore, the residues D16 and D18 processed by the vertical crusher 100 contain almost no metals. Therefore, when the residues D16 and D18 are crushed by the vertical crusher 100, it is possible to suppress wear and damage to the vertical crusher 100 due to contact or collision with metals.

[0078] (4) In the examples of Figures 8 and 9, the magnetic separator 16 and / or the metal identification separator 17 may be arranged downstream of the thermal desalination furnace 20. That is, the magnetic separator 16 and / or the metal identification separator 17 may be arranged between the thermal desalination furnace 20 and the vertical crusher 100, or may be arranged downstream of the vertical crusher 100.

[0079] (5) The waste treatment system 10 may employ various sorting methods to sort the waste W. Examples of the various sorting methods include a method that uses magnetic force (magnetic sorter), a method that uses eddy currents (eddy current sorter), a method that uses sieves (sieve sorter), a method that uses differences in specific gravity (wind sorter, shaking sorter), and a method that uses differences in shape (shaking sorter). The order in which these sorting methods are applied to the waste W may be changed as appropriate depending on the purpose of the sorting. The number of times these sorting methods are applied to the waste W may be one or multiple times depending on the purpose of the sorting.

[0080] The air sorter 15 may be arranged, for example, upstream of the magnetic separator 14, or downstream of the magnetic separator 14. The waste treatment system 10 may be equipped with, for example, a plurality of air sorters 15. In this case, one of the plurality of air sorters 15 may be arranged upstream of the magnetic separator 14, and another of the plurality of air sorters 15 may be arranged downstream of the magnetic separator 14.

[0081] [Other examples] Example 1. One example of a waste treatment system is a waste treatment system that separates and processes waste to use plastic materials contained in the waste as a thermal energy source, and includes a crusher configured to crush the waste to produce crushed material, a magnetic separator configured to perform magnetic separation on the crushed material and separate iron from the crushed material, a sorting unit configured to separate stainless metals and chromium from a first residue remaining after the iron from the crushed material has been separated in the magnetic separator, and a thermal desalination furnace configured to heat a second residue remaining after the stainless metals and chromium have been separated from the first residue to produce a desalted material. The sorting unit includes a magnetic separator configured to separate magnetic stainless steel from the stainless metals from the sorting target by magnetic separation or eddy current separation, and a metal identification separator configured to identify the type of metal from the sorting target and separate non-magnetic stainless steel and chromium from the stainless metals. The magnetic sorting machine is configured to supply the processed product after magnetic stainless steel has been separated from the sorting target to the metal identification sorting machine, or to process the processed product after non-magnetic stainless steel and chromium have been separated from the sorting target by the metal identification sorting machine as the sorting target.

[0082] According to Example 1, after the iron elements are separated from the crushed material by the magnetic separator, the stainless steel metals and chromium are separated from the first residue by the sorting unit. That is, chromium-containing materials tend to be concentrated in the recovered material in the sorting unit. Therefore, it becomes possible to effectively sort the chromium-containing materials in the sorting unit.

[0083] According to Example 1, metal waste is separated in stages, so the separation process is completed on the same line. In other words, no separate separation process is required for the iron recovered by the magnetic separator and the stainless steel metals and chromium recovered by the separation unit. This makes it possible to simplify the equipment for separating waste. This effect is particularly noticeable when separating SR and ASR, which are prone to entanglement between metals and plastic materials and can be time-consuming to separate.

[0084] According to Example 1, iron, stainless steel metals, and chromium are respectively recovered by the magnetic separator and the sorting unit. This makes it difficult for metals to reach subsequent structures. This makes it possible to suppress wear and damage to subsequent structures.

[0085] Example 2: The system of Example 1 may further include a gravity difference sorter configured to separate the first residue into heavy and light products by utilizing the difference in specific gravity of the first residue remaining after the iron ore is separated from the crushed material by the magnetic separator, and the sorting unit may be configured to separate stainless steel metals and chromium from the light products separated by the gravity difference sorter. In this case, the sorting unit separates the stainless steel metals and chromium from the light products remaining after the heavy products are separated from the first residue. This prevents the operation of the sorting unit from being affected by contact or collision with the heavy products, and prevents the sorting unit from becoming larger in size due to the need to separate the stainless steel metals and chromium contained in the heavy products. This allows for more effective sorting of chromium-containing materials in the sorting unit.

[0086] Example 3. Another example of a waste treatment system is a waste treatment system that separates and processes waste to use plastic materials contained in the waste as a thermal energy source, and includes a crusher configured to crush the waste to produce crushed material, a magnetic separator configured to perform magnetic separation on the crushed material and separate iron from the crushed material, a thermal desalination furnace configured to heat the residue after the iron has been separated from the crushed material to produce a desalted material, and a sorting unit configured to separate stainless metals and chromium from the desalted material. The sorting unit includes a magnetic separator configured to separate magnetic stainless steel from the stainless metals from the sorting target by magnetic separation or eddy current separation, and a metal identification separator configured to identify the type of metal from the sorting target and separate non-magnetic stainless steel and chromium from the stainless metals. The magnetic sorting machine is configured to supply the processed product after magnetic stainless steel has been separated from the sorting target to the metal identification sorting machine, or to process the processed product after non-magnetic stainless steel and chromium have been separated from the sorting target by the metal identification sorting machine as the sorting target.

[0087] According to Example 3, after the iron elements are separated from the crushed material by the magnetic separator, the stainless steel metals and chromium are separated from the desalted material by the sorting unit. That is, chromium-containing materials tend to be concentrated in the recovered material in the sorting unit. Therefore, it becomes possible to effectively sort the chromium-containing materials in the sorting unit.

[0088] According to Example 3, metal waste is separated in stages, so the separation process is completed on the same line. In other words, no separate separation process is required for the iron recovered by the magnetic separator and the stainless steel and chromium recovered by the separation unit. This makes it possible to simplify the equipment for separating waste. This effect is particularly noticeable when separating SR and ASR, which are prone to entanglement between metals and plastic materials and can be time-consuming to separate.

[0089] According to Example 3, the demineralized material, which has been embrittled by heating the residue, is subjected to a separation process for stainless steel metals and chromium in the separation unit. This makes it easier to separate the stainless steel metals and chromium from the embrittled demineralized material in the separation unit. This makes it possible to further increase the recovery rate of chromium-containing materials from waste.

[0090] Example 4: The system of Example 3 may further include a vertical crusher configured to crush the remaining residue remaining after the stainless steel metals and chromium are separated from the demineralized material by the sorting unit. In this case, iron is separated by the magnetic separator, and stainless steel metals and chromium are separated by the sorting unit, so the remaining residue contains almost no metals. Therefore, when the remaining residue is crushed by the vertical crusher, wear and damage to the vertical crusher due to contact or collision with metals can be suppressed.

[0091] Example 5. One example of a waste treatment method is a method for sorting and treating waste to use plastic materials contained in the waste as a thermal energy source, and includes a first step of crushing the waste to produce crushed material, a second step of magnetically separating the crushed material using a magnetic separator to separate iron from the crushed material, a third step of separating stainless steel metals and chromium from the first residue remaining after the iron has been separated from the crushed material in the magnetic separator using a sorting unit, and a fourth step of heating the second residue remaining after the stainless steel metals and chromium have been separated from the first residue in a thermal desalination furnace to produce a desalination product. The third step includes a first sub-step of separating magnetic stainless steel from the stainless steel metals from the sorting target by magnetic separation or eddy current separation using a magnetic separator, and a second sub-step of identifying the type of metal from the sorting target and separating non-magnetic stainless steel and chromium from the stainless steel metals using a metal identification and sorting machine. The second sub-step is executed after the first sub-step, or the first sub-step is executed after the second sub-step. In this case, the same effects as those of the system of Example 1 can be obtained.

[0092] Example 6: Another example of a waste treatment method is a method for sorting and treating waste to use plastic materials contained in the waste as a thermal energy source. The method includes a first step of crushing the waste to produce crushed material; a second step of magnetically separating the crushed material using a magnetic separator to separate iron from the crushed material; a third step of heating the residue after the iron has been separated from the crushed material in a thermal desalination furnace to produce a desalination product; and a fourth step of separating stainless steel metals and chromium from the desalination product using a sorting unit. The fourth step includes a first substep of separating magnetic stainless steel from the stainless steel metals from the sorting target by magnetic separation or eddy current separation using a magnetic separator; and a second substep of identifying the type of metal from the sorting target and separating non-magnetic stainless steel and chromium from the stainless steel metals using a metal identification and sorting machine. The second substep is performed after the first substep, or the first substep is performed after the second substep. In this case, the same effects as those of the system of Example 3 can be obtained.

[0093] Example 7. An example of a clinker production method involves heating cement raw materials in a kiln using plastic materials separated from waste by the method of Example 5 or Example 6 as a thermal energy source in the kiln. In this case, the same effects as those of the method of Example 5 or Example 6 can be obtained. [Explanation of symbols]

[0094] 1...clinker manufacturing equipment, 2...kiln equipment, 10...waste treatment system, 13...crusher, 14...magnetic separator, 15...wind separator (gravity separator), 16...magnetic separator (separation section), 17...metal identification separator (separation section), 20...thermal desalination furnace, 100...vertical crusher, D4...crushed material, D6...light product (first residue), D7...foreign matter (heavy product), D8...large lump (heavy product), D10...residue (second residue), D11...desalted material, M1...iron, M2...magnetic stainless steel (stainless metal), M3...non-magnetic stainless steel (stainless metal), M4...chromium, P...plastic material, W...waste, W1...cement raw material, W2...cement clinker (clinker).

Claims

1. A waste treatment system for sorting and treating waste so that plastic materials contained in the waste can be used as a thermal energy source, comprising: a shredder configured to shred the waste material to generate shredded material; a magnetic separator configured to perform magnetic separation on the crushed material and separate iron from the crushed material; a sorting unit configured to separate stainless steel metals and chromium from a first residue remaining after the iron types have been separated from the crushed material in the magnetic separator; a heating desalination furnace configured to heat a second residue obtained after the stainless steel metal and chromium have been separated from the first residue to generate a desalination product, The sorting unit is a magnetic sorting machine configured to separate magnetic stainless steel from the stainless steel metals by magnetic sorting or eddy current sorting; a metal identifying and sorting machine configured to identify the type of metal from the object to be sorted and separate non-magnetic stainless steel and chromium from the stainless steel metals, A waste treatment system in which the magnetic sorting machine is configured to supply the processed product after the magnetic stainless steel has been separated from the sorting target to the metal identifying sorting machine, or is configured to treat the processed product after the non-magnetic stainless steel and chromium have been separated from the sorting target by the metal identifying sorting machine as the sorting target.

2. The magnetic separator further includes a specific gravity difference separator configured to separate the first residue into heavy products and light products by utilizing the specific gravity difference of the first residue after the iron group has been separated from the crushed material by the magnetic separator, The system according to claim 1 , wherein the sorting unit is configured to separate the stainless steel metals and chromium from the light products sorted by the gravity difference sorter.

3. A waste treatment system for sorting and treating waste so that plastic materials contained in the waste can be used as a thermal energy source, comprising: a shredder configured to shred the waste material to generate shredded material; a magnetic separator configured to perform magnetic separation on the crushed material and separate iron from the crushed material; a thermal desalination furnace configured to heat a residue obtained after the iron species are separated from the crushed material to generate a desalted material; a sorting unit configured to separate stainless steel metals and chromium from the desalted material, The sorting unit is a magnetic sorting machine configured to separate magnetic stainless steel from the stainless steel metals by magnetic sorting or eddy current sorting; a metal identifying and sorting machine configured to identify the type of metal from the object to be sorted and separate non-magnetic stainless steel and chromium from the stainless steel metals, A waste treatment system in which the magnetic sorting machine is configured to supply the processed product after the magnetic stainless steel has been separated from the sorting target to the metal identifying sorting machine, or is configured to treat the processed product after the non-magnetic stainless steel and chromium have been separated from the sorting target by the metal identifying sorting machine as the sorting target.

4. 4. The system of claim 3, further comprising a vertical crusher configured to crush another residue remaining after the stainless metals and chromium are separated from the demineralized product by the separator.

5. 1. A waste treatment method for sorting and treating waste so that plastic materials contained in the waste can be used as a thermal energy source, comprising: a first step of crushing the waste to produce crushed material; a second step of magnetically separating the crushed material using a magnetic separator to separate iron from the crushed material; a third step of separating stainless steel metals and chromium from a first residue remaining after the iron types have been separated from the crushed material by the magnetic separator, using a sorting unit; a fourth step of heating the second residue obtained after the stainless steel metal and chromium have been separated from the first residue in a thermal desalination furnace to produce a desalination product, The third step is a first sub-step of separating magnetic stainless steel from the stainless-based metals by magnetic sorting or eddy current sorting using a magnetic sorter; a second sub-step of using a metal identification and sorting machine to identify the type of metal from the object to be sorted and separating non-magnetic stainless steel and chromium from the stainless steel-based metals; A waste treatment method, wherein the second sub-step is carried out after the first sub-step, or the first sub-step is carried out after the second sub-step.

6. 1. A waste treatment method for sorting and treating waste so that plastic materials contained in the waste can be used as a thermal energy source, comprising: a first step of crushing the waste to produce crushed material; a second step of magnetically separating the crushed material using a magnetic separator to separate iron from the crushed material; a third step of heating the residue remaining after the iron species have been separated from the crushed material in a thermal desalination furnace to produce a desalted material; and a fourth step of separating stainless steel metals and chromium from the desalted product by a sorting unit, The fourth step is a first sub-step of separating magnetic stainless steel from the stainless-based metals by magnetic sorting or eddy current sorting using a magnetic sorter; a second sub-step of using a metal identification and sorting machine to identify the type of metal from the object to be sorted and separating non-magnetic stainless steel and chromium from the stainless steel-based metals; A waste treatment method, wherein the second sub-step is carried out after the first sub-step, or the first sub-step is carried out after the second sub-step.

7. 7. A method for producing clinker, comprising heating cement raw materials in a kiln system using the plastic material separated from the waste by the method of claim 5 or 6 as a thermal energy source in the kiln system.

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