Waste sorting system and waste sorting method

Abstract

To prevent non-combustible materials from being transported together with flammable materials. [Solution] The waste sorting system comprises a first crusher for crushing waste, a first magnetic separator for recovering iron from the waste crushed by the first crusher, a first air separator for separating combustible materials from the waste from which iron has been removed by the first magnetic separator, a second crusher for further crushing the waste from which iron has been recovered by the first magnetic separator and combustible materials have been removed by the first air separator, and a second magnetic separator for recovering iron from the waste crushed by the second crusher. The system comprises: a machine; a second air separator for separating combustible materials attached to iron recovered by the second magnetic separator; a particle size separator for recovering waste with a predetermined particle size or smaller from the waste from which iron has been removed by the second magnetic separator; a non-ferrous metal separator for recovering non-ferrous metals from waste not recovered by the particle size separator; a third air separator for separating combustible materials attached to the recovered non-ferrous metals; and a fourth air separator for separating combustible materials from the recovered waste with a predetermined particle size or smaller.

Description

Technical Field

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[0001] The present invention relates to a garbage sorting system and a garbage sorting method.

Background Art

[0002] As an invention for sorting crushed garbage, there is, for example, a garbage sorting apparatus disclosed in Patent Document 1. This garbage sorting apparatus crushes the bulky garbage stored in the bulky garbage pit with a first crusher. Next, iron is recovered from the garbage crushed by the first crusher with a first magnetic separator, and aluminum is recovered from the garbage from which iron has been removed by the first magnetic separator with a first aluminum separator. The garbage from which aluminum has been removed by the first aluminum separator is conveyed to an incinerator pit as combustible waste. The iron recovered by the first magnetic separator and the aluminum recovered by the first aluminum separator are crushed by a second crusher. Next, iron is recovered from the iron and aluminum crushed by the second crusher with a second magnetic separator, incombustibles are recovered from the garbage from which iron has been removed by the second magnetic separator with a particle size separator, and aluminum is recovered from the garbage from which the incombustibles have been recovered with a second aluminum separator. The garbage from which aluminum has been removed by the first and second aluminum separators is conveyed to an incinerator pit as combustible waste.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the garbage sorting apparatus disclosed in Patent Document 1, the garbage input to the first crusher may contain incombustibles such as glass, sand, and substrates of electrical products. Since these incombustibles are not recovered by the first magnetic separator and the first aluminum separator, they are conveyed to the incinerator pit together with the combustibles.

[0005] The present invention has been made in view of the above, and aims to reduce the amount of non-combustible material transported together with combustible material. [Means for solving the problem]

[0006] A waste sorting system according to one aspect of the present invention comprises: a first crusher for crushing the waste that is input; a first magnetic separator for separating and recovering iron from the waste crushed by the first crusher using magnetic force; a first air separator for separating combustible materials from the waste from which iron has been removed by the first magnetic separator using air force; a second crusher for crushing the iron recovered by the first magnetic separator and the waste from which combustible materials have been removed by the first air separator into finer pieces than the first crusher; and a second magnetic separator for separating and recovering iron from the waste crushed by the second crusher using magnetic force. The system comprises: a second air separator for separating combustible materials attached to iron recovered by the second magnetic separator using air power; a particle size separator for recovering waste with a predetermined particle size or smaller from the waste from which iron has been removed by the second magnetic separator; a non-ferrous metal separator for recovering non-ferrous metals from the waste from which waste with a predetermined particle size or smaller has been removed by the particle size separator; a third air separator for separating combustible materials attached to non-ferrous metals recovered by the non-ferrous metal separator using air power; and a fourth air separator for separating combustible materials with a predetermined particle size or smaller from the waste recovered by the particle size separator using air power.

[0007] Furthermore, a waste sorting system according to one aspect of the present invention includes: a first crusher for crushing the input waste; a first magnetic separator for separating and recovering iron from the waste crushed by the first crusher using magnetic force; a first air separator for separating combustible materials from the waste from which iron has been removed by the first magnetic separator using air force; a second crusher for further crushing the iron recovered by the first magnetic separator and the waste from which combustible materials have been removed by the first air separator into finer pieces than the first crusher; and waste crushed by the second crusher. The system comprises: a second magnetic separator for separating and recovering iron by magnetic force; a second air separator for separating combustible materials attached to the iron recovered by the second magnetic separator by air force; a non-ferrous metal separator for recovering non-ferrous metals from the waste from which iron has been removed by the second magnetic separator; a third air separator for separating combustible materials attached to the non-ferrous metals recovered by the non-ferrous metal separator by air force; and a fourth air separator for separating combustible materials from the waste from which non-ferrous metals have been removed by the non-ferrous metal separator by air force.

[0008] The waste sorting method according to the present invention comprises: a first crushing step of crushing the input waste; a first magnetic separation step of separating and recovering iron from the waste crushed in the first crushing step using magnetic force; a first air separation step of separating combustible materials from the waste from which iron has been removed in the first magnetic separation step using air force; a second crushing step of crushing the iron recovered in the first magnetic separation step and the waste from which combustible materials have been removed in the first air separation step into finer pieces than in the first crushing step; and a second magnetic separation step of separating and recovering iron from the waste crushed in the second crushing step using magnetic force. The system comprises: a second wind separation step for separating combustible materials attached to iron recovered in the second magnetic separation step using wind power; a particle size separation step for recovering waste of a predetermined particle size or smaller from the waste from which iron has been removed in the second magnetic separation step; a non-ferrous metal separation step for recovering non-ferrous metals from the waste from which waste of a predetermined particle size or smaller has been removed in the particle size separation step; a third wind separation step for separating combustible materials attached to non-ferrous metals recovered in the non-ferrous metal separation step using wind power; and a fourth wind separation step for separating combustible materials from the waste of a predetermined particle size or smaller recovered in the particle size separation step.

[0009] The waste sorting method according to the present invention comprises: a first crushing step of crushing the input waste; a first magnetic separation step of separating and recovering iron from the waste crushed in the first crushing step using magnetic force; a first air separation step of separating combustible materials from the waste from which iron has been removed in the first magnetic separation step using air force; a second crushing step of crushing the iron recovered in the first magnetic separation step and the waste from which combustible materials have been removed in the first air separation step into finer pieces than in the first crushing step; and the iron from the waste crushed in the second crushing step. The system comprises: a second magnetic separation step for separating and recovering iron by magnetic force; a second wind separation step for separating combustible materials attached to the iron recovered in the second magnetic separation step by wind power; a non-ferrous metal separation step for recovering non-ferrous metals from the waste from which iron has been removed in the second magnetic separation step; a third wind separation step for separating combustible materials attached to the non-ferrous metals recovered in the non-ferrous metal separation step by wind power; and a fourth wind separation step for separating combustible materials from the waste from which non-ferrous metals have been removed in the non-ferrous metal separation step by wind power. [Effects of the Invention]

[0010] According to the present invention, it is possible to reduce the amount of non-combustible material transported together with combustible material. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 shows the flow of waste sorting and processing in the first embodiment. [Figure 2] Figure 2 shows the configuration of the waste sorting system according to the first embodiment. [Figure 3] Figure 3 shows the flow of waste sorting and processing in the second embodiment. [Figure 4A] Figure 4A shows an example of the proportions of iron, aluminum, combustible materials, and noncombustible materials in the receiving hopper. [Figure 4B] Figure 4B shows the proportion of waste in each of the following storage hopper sections after sorting in the waste sorting system: the combustible waste pit, the aluminum storage hopper, the non-combustible waste storage hopper, and the iron storage hopper. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below. Furthermore, in the drawings, the same or corresponding elements are denoted by the same reference numerals as appropriate.

[0013] Figure 1 shows the flow of waste sorting in the first embodiment of the present invention. The receiving hopper 10 is a hopper into which bulky waste and non-combustible waste are fed. The waste fed into the receiving hopper 10 includes non-ferrous metals such as iron and aluminum, non-combustible materials such as glass and sand, and combustible materials such as wood. The waste fed into the receiving hopper 10 is sent to a twin-shaft shredder 20, which is an example of a first shredder.

[0014] The twin-shaft shredder 20 is a device that coarsely shreds waste using blades attached to two rotating, parallel shafts. The twin-shaft shredder 20 coarsely shreds combustible and non-combustible bulky waste to a size of, for example, 400 mm or less. The blade width of the twin-shaft shredder 20 is, for example, about 100 mm. The twin-shaft shredder 20 also plays a role in releasing the gas from cassette gas canisters when they are fed into the waste. The waste shredded by the twin-shaft shredder 20 is sent to the first magnetic separator 30.

[0015] The first magnetic separator 30 is a device that separates and recovers iron and other metals contained in the crushed waste using magnetic force. The iron and other metals recovered by the first magnetic separator 30 are sent to the vertical crusher 21. At this point, any combustible materials attached to the iron and other metals are also sent to the vertical crusher 21 along with the recovered iron and other metals. After the iron and other metals have been recovered by the first magnetic separator 30, the waste is sent to the first air separator 41.

[0016] The first wind separator 41 is a device that uses wind power to separate and recover lightweight combustible materials from the waste from which iron has been removed. The combustible materials recovered by the first wind separator 41 are sent to the combustible material pit 80. The waste from which the combustible materials have been removed by the first wind separator 41 is sent to the vertical crusher 21, which is an example of a second crusher.

[0017] The vertical crusher 21 is a device that roughly crushes garbage with a high-speed rotating breaker and finely crushes garbage with multiple stages of grinders. The vertical crusher 21 crushes the input garbage to, for example, 150 mm or less. The garbage crushed by the vertical crusher 21 is sent to the second magnetic separator 31.

[0018] The second magnetic separator 31 is a device that separates and recovers iron contained in the crushed garbage by magnetism. The iron recovered by the second magnetic separator 31 is sent to the second air separator 42. Here, the combustibles adhering to the iron are also sent to the second air separator 42 together with the recovered iron. The garbage from which iron has been removed by the second magnetic separator 31 is sent to the particle size separator 50.

[0019] The particle size separator 50 is a rotary separator that separates the input garbage into garbage exceeding a predetermined particle size and garbage below the predetermined particle size, for example, by a sieve on a rotating drum. The garbage exceeding the predetermined particle size separated by the particle size separator 50 is sent to the non-ferrous metal separator 51. The garbage below the predetermined particle size separated by the particle size separator 50 is incombustible and is sent to the fourth air separator 44.

[0020] The non-ferrous metal separator 51 is a device that separates non-ferrous metals that are good conductors such as aluminum, copper, brass, and magnesium, and is an example of the non-ferrous metal separator according to the present invention. The non-ferrous metal separator 51 rotates a permanent magnet at high speed inside a drum and supplies garbage to the drum surface by a belt conveyor. An alternating magnetic field is generated on the drum surface due to the high-speed rotation of the permanent magnet. When non-ferrous metal passes through the drum surface, eddy currents are generated and the non-ferrous metal repels and jumps out, and the non-ferrous metal is separated. The garbage from which non-ferrous metal has been removed by the non-ferrous metal separator 51 is combustible and is sent to the combustible pit 80. The non-ferrous metal separated and recovered by the non-ferrous metal separator 51 is sent to the third air separator 43. Here, the combustibles adhering to the recovered non-ferrous metal are also sent to the third air separator 43 together with the recovered non-ferrous metal.

[0021] The second air classifier 42 is a device that separates and recovers combustible materials adhering to the waste conveyed from the second magnetic separator 31 by air. The combustible materials recovered by the second air classifier 42 are sent to the combustible material pit 80. The waste from which the combustible materials have been removed by the second air classifier 42 is ferrous materials and is sent to the ferrous materials storage hopper 62.

[0022] The third air classifier 43 is a device that separates and recovers combustible materials from the input waste by air. The third air classifier 43 separates and recovers the combustible materials adhering to the input non-ferrous metals. The combustible materials recovered by the third air classifier 43 are sent to the combustible material pit 80. The waste from which the combustible materials have been removed by the third air classifier 43 is waste containing non-ferrous metals such as aluminum, copper, brass, and magnesium, and is sent to the aluminum storage hopper 60.

[0023] The fourth air classifier 44 is a device that separates and recovers combustible materials from the non-combustible materials with combustible materials attached, which are recovered by the particle size classifier 50, by air. The combustible materials recovered by the fourth air classifier 44 are sent to the combustible material pit 80. The waste from which the combustible materials have been removed by the fourth air classifier 44 is non-combustible waste such as glass and sand, and is sent to the non-combustible waste storage hopper 61.

[0024] FIG. 2 is a diagram showing the configuration of the waste separation system 1 according to an embodiment of the present invention. The bulky waste and non-combustible waste stored in the storage yard 200 are put into the receiving hopper 10 by the transport vehicle 201. Instead of the storage yard 200, the bulky waste and non-combustible waste may be put into the receiving hopper 10 from a storage pit that stores the bulky waste and non-combustible waste. The waste put into the receiving hopper 10 is conveyed to the twin-shaft crusher 20 by the first conveyor 11. In the vicinity of the receiving hopper 10, a dust collection hood 90 is arranged. The dust collection hood 90 is connected to the connection point B by a duct not shown in the figure. The connection point B is connected to the bag filter 71, and the air and dust near the first conveyor 11 are sucked by the exhaust fan 72 through the dust collection hood 91, the duct, and the bag filter 71.

[0025] The twin-shaft shredder 20 roughly crushes the waste transported by the first conveyor 11 to pieces of, for example, 400 mm or less. The waste crushed by the twin-shaft shredder 20 is transported to the first magnetic separator 30 by the second conveyor 12. A dust collection hood 91 is positioned near the second conveyor 12. The dust collection hood 91 is connected to connection point B by a duct (not shown). Air and dust near the second conveyor 12 are drawn in by the exhaust fan 72 via the dust collection hood 91, the duct, and the bag filter 71.

[0026] The first magnetic separator 30 separates and recovers iron from the waste transported by the second conveyor 12. The iron recovered by the first magnetic separator 30 is sent to the vertical crusher 21 by the third conveyor 13. The waste from which the iron has been removed by the first magnetic separator 30 is sent to the first air separator 41.

[0027] The first air separator 41 separates and collects lightweight combustible materials using airflow. The discharge section 100 of the first air separator 41 is connected to connection point A by a duct (not shown). Connection point A is connected to a separator 70 which is connected to a bag filter 71, and the combustible materials collected by the first air separator 41 are sucked to the separator 70 via the discharge section 100, the duct, and connection point A. The waste from which combustible materials have been removed by the first air separator 41 is sent to the vertical crusher 21 by the third conveyor 13.

[0028] The vertical crusher 21 crushes the iron recovered by the first magnetic separator 30 and the waste from which combustible materials have been removed by the first air separator 41. The vertical crusher 21 crushes the input waste more finely than the twin-shaft crusher 20, separating the iron and non-ferrous metals that are entangled with combustible materials. As the iron and non-ferrous metals are finely crushed and the entangled combustible materials are separated, the recovery rate of iron in the second magnetic separator 31, which is installed downstream of the vertical crusher 21 in the waste transport direction, and the recovery rate of non-ferrous metals in the non-ferrous metal separator 51 are improved. Furthermore, non-iron waste fed into the vertical crusher 21 has its combustible materials separated by the first air separator 41, reducing the amount of combustible materials that would accelerate wear on the grinder of the vertical crusher 21. This also helps to suppress wear on the grinder of the vertical crusher 21. Additionally, because the amount of combustible materials fed into the vertical crusher 21 is reduced, even if an explosion or fire occurs in the vertical crusher 21 due to a cassette gas cylinder or lithium-ion battery, the spread of fire can be suppressed.

[0029] The waste crushed by the vertical crusher 21 is transported to the second magnetic separator 31 by the fourth conveyor 14 and the fifth conveyor 15. Dust collection hoods 92 and 93 are positioned near the fourth conveyor 14. The dust collection hoods 92 and 93 are connected to connection point B by ducts (not shown). Air and dust near the fourth conveyor 14 are drawn in by the exhaust fan 72 via the dust collection hoods 92 and 93, the ducts, and the bag filter 71.

[0030] The second magnetic separator 31 separates and recovers iron from the waste transported by the fifth conveyor 15. The iron recovered by the second magnetic separator 31 is sent to the second air separator 42. The second air separator 42 separates and recovers lightweight combustible materials attached to the iron using air power. The combustible materials recovered by the second air separator 42 are sent to the separator 70. The iron from which the combustible materials have been removed by the second air separator 42 is sent to the iron storage hopper 62 and recovered by truck T.

[0031] The waste from which iron has been removed by the second magnetic separator 31 is separated by the particle size separator 50 into waste exceeding a predetermined particle size and waste below a predetermined particle size. The waste below the predetermined particle size separated by the particle size separator 50 is non-combustible material such as glass and sand, and is sent to the fourth air separator 44. The fourth air separator 44 separates and recovers lightweight combustible material attached to the non-combustible material using air power. The combustible material recovered by the fourth air separator 44 is sucked into the separator 70. The non-combustible material from which the combustible material has been removed by the fourth air separator 44 is sent to the non-combustible material storage hopper 61 and recovered by truck T.

[0032] Waste exceeding a predetermined particle size, separated by the particle size sorter 50, is sent to the non-ferrous metal sorter 51. The non-ferrous metal sorter 51 sorts non-ferrous metals such as aluminum, and the recovered non-ferrous metals are sent to the third air sorter 43. The third air sorter 43 sorts and recovers lightweight combustible materials attached to the non-ferrous metals transported from the non-ferrous metal sorter 51 using air power. The combustible materials recovered by the third air sorter 43 are sucked into the separator 70. The non-ferrous metals from which the combustible materials have been removed by the third air sorter 43 are sent to the aluminum storage hopper 60 and collected by truck T. The waste from which the non-ferrous metals have been removed by the non-ferrous metal sorter 51 is combustible material and is transported to the combustible material pit 80 by the sixth conveyor 16. Furthermore, the combustible material from which non-ferrous metals have been removed by the non-ferrous metal separator 51 may be sent to a storage hopper and recovered by truck T.

[0033] The separator 70 is connected to the exhaust fan 72 via a bag filter 71. The combustible materials separated by the first air separator 41, second air separator 42, third air separator 43, and fourth air separator 44, which are connected to the separator 70, are drawn into the separator 70 along with the air when the exhaust fan 72 draws in air from the bag filter 71 side. The separator 70 separates the combustible materials from the drawn-in air. The combustible materials separated by the separator 70 are sent from connection point C1 to connection point C2 via a conveyor (not shown), and from connection point C2 to the combustible material pit 80 via a sixth conveyor 16. The combustible materials stored in the combustible material pit 80 are processed in an incinerator.

[0034] After the combustible material has been separated by the separator 70, the air flows to the bag filter 71 through the air intake of the exhaust fan 72. The bag filter 71 removes dust from the incoming air. The air that has been filtered by the bag filter 71 is then discharged outdoors from the exhaust fan 72 through the silencer 73, which acts as a muffler.

[0035] According to this embodiment, combustible materials are separated by the first air separator 41 and sent to the combustible material pit 80, and the combustible materials are separated from the non-combustible materials that are sent to the vertical crusher 21, thereby reducing the amount of non-combustible materials that are transported together with the combustible materials.

[0036] In the first embodiment described above, the waste sorting system 1 is equipped with a particle size separator 50, but it may also be configured without a particle size separator 50. Figure 3 is a diagram showing the flow of waste sorting in the waste sorting system 1A according to the second embodiment of the present invention. In this modified example, the waste from which iron has been removed by the second magnetic separator 31 is sent to the non-ferrous metal separator 51. The non-ferrous metals separated and recovered by the non-ferrous metal separator 51 are sent to the third air separator 43. The waste from which non-ferrous metals have been removed by the non-ferrous metal separator 51 consists of combustible and non-combustible materials, and is sent to the fourth air separator 44. The fourth air separator 44 separates and recovers the combustible materials attached to the input waste. The combustible materials recovered by the fourth air separator 44 are sent to the combustible material pit 80. The waste from which combustible materials have been removed by the fourth wind separator 44 is non-combustible waste and is sent to the non-combustible waste storage hopper 61.

[0037] Figure 4A shows an example of the proportions of iron, aluminum (non-ferrous metals), combustible materials, and non-combustible materials in the receiving hopper 10. Figure 4B shows the proportions of waste in the iron storage hopper 62, aluminum storage hopper 60, combustible material pit 80, and non-combustible material storage hopper 61 when the waste in the receiving hopper 10 is separated by the waste separation systems 1 and 1A according to the proportions shown in Figure 4A. The first comparative example in Figure 4B is the proportion of waste in the iron yard, aluminum yard, and non-combustible material yard in the first embodiment of Patent Document 1, and the second comparative example is the proportion of waste in the iron yard, aluminum yard, non-combustible material yard, and incinerator pit in the second embodiment of Patent Document 1. In the first and second embodiments, compared to the first and second comparative examples, there is a larger amount of non-combustible material in the non-combustible material storage hopper 61, and it is clear that the amount of non-combustible material transported together with combustible material is reduced. [Explanation of Symbols]

[0038] 1. 1A Waste sorting system 20 Twin-shaft shredder 21 Vertical crusher 30. First Magnetic Separator 31. Second Magnetic Separator 41. First Wind Separator 42. Second wind-powered sorting machine 43. Third Wind Separator 44. Fourth Wind Separator 50 particle size sorter 51 Non-ferrous metal sorting machine

Claims

1. The first crusher crushes the waste that is fed in, A first magnetic separator that separates and recovers iron from the waste crushed by the first crusher using magnetic force, A first air separator separates combustible materials from the waste from which iron has been removed by the first magnetic separator, A second crusher further crushes the iron and other materials recovered by the first magnetic separator and the waste from which combustible materials have been removed by the first air separator into finer pieces than the first crusher. A second magnetic separator for separating and recovering iron from the waste crushed by the second crusher using magnetic force, A second wind separator separates combustible materials attached to iron recovered by the second magnetic separator using wind power, A particle size separator that recovers waste with a particle size of a predetermined size or smaller from the waste from which iron has been removed by the second magnetic separator, A non-ferrous metal separator that recovers non-ferrous metals from waste from which waste with a predetermined particle size or smaller has been removed by the aforementioned particle size separator, A third wind separator that separates combustible materials attached to non-ferrous metals recovered by the aforementioned non-ferrous metal separator using wind power, A fourth air separator separates combustible materials from waste with a predetermined particle size or smaller collected by the aforementioned particle size separator using air power, A waste sorting system equipped with the following features.

2. The first crusher crushes the waste that is fed in, A first magnetic separator that separates and recovers iron from the waste crushed by the first crusher using magnetic force, A first air separator separates combustible materials from the waste from which iron has been removed by the first magnetic separator, A second crusher further crushes the iron and other materials recovered by the first magnetic separator and the waste from which combustible materials have been removed by the first air separator into finer pieces than the first crusher. A second magnetic separator for separating and recovering iron from the waste crushed by the second crusher using magnetic force, A second wind separator separates combustible materials attached to iron recovered by the second magnetic separator using wind power, A non-ferrous metal separator for recovering non-ferrous metals from waste from which iron has been removed by the second magnetic separator, A third wind separator that separates combustible materials attached to non-ferrous metals recovered by the aforementioned non-ferrous metal separator using wind power, A fourth wind separator separates combustible materials from the waste from which non-ferrous metals have been removed by the aforementioned non-ferrous metal separator, A waste sorting system equipped with the following features.

3. The first crushing process crushes the waste that is fed in, A first magnetic separation step in which iron is separated and recovered from the waste crushed in the first crushing step by magnetic force, A first air separation step in which combustible materials are separated by air power from the waste from which iron has been removed in the first magnetic separation step, A second crushing step further crushes the iron recovered in the first magnetic separation step and the waste from which combustible materials have been removed in the first air separation step into a finer crushing step than the first crushing step, A second magnetic separation step is performed to separate and recover iron from the waste crushed in the second crushing step using magnetic force, A second wind separation step in which combustible materials attached to iron recovered in the second magnetic separation step are separated by wind power, A particle size sorting step is performed to recover waste with a particle size of a predetermined size or smaller from the waste from which iron has been removed in the second magnetic sorting step, A non-ferrous metal sorting step is performed to recover non-ferrous metals from the waste from which waste with a predetermined particle size or smaller has been removed in the particle size sorting step, A third wind separation step in which combustible materials attached to non-ferrous metals recovered in the aforementioned non-ferrous metal separation step are separated by wind power, A fourth air separation step for separating combustible materials from waste with a predetermined particle size or smaller recovered in the particle size separation step, A waste sorting method that includes the following features.

4. The first crushing process crushes the waste that is fed in, A first magnetic separation step in which iron is separated and recovered from the waste crushed in the first crushing step by magnetic force, A first air separation step in which combustible materials are separated by air power from the waste from which iron has been removed in the first magnetic separation step, A second crushing step further crushes the iron recovered in the first magnetic separation step and the waste from which combustible materials have been removed in the first air separation step into a finer crushing step than the first crushing step, A second magnetic separation step is performed to separate and recover iron from the waste crushed in the second crushing step using magnetic force, A second wind separation step in which combustible materials attached to iron recovered in the second magnetic separation step are separated by wind power, A non-ferrous metal separation process for recovering non-ferrous metals from the waste from which iron has been removed in the second magnetic separation process, A third wind separation step in which combustible materials attached to non-ferrous metals recovered in the aforementioned non-ferrous metal separation step are separated by wind power, A fourth wind separation step in which combustible materials are separated by wind power from the waste from which non-ferrous metals have been removed in the aforementioned non-ferrous metal separation step, A waste sorting method that includes the following features.

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