Apparatus and method for producing cement raw material, and apparatus and method for producing cement clinker

Abstract

To provide a method for manufacturing a cement raw material, capable of sufficiently reducing a load on manufacturing equipment by selecting a metal from a waste with high accuracy.SOLUTION: An apparatus 100 for manufacturing a cement raw material using a raw material containing a waste containing a metal includes: a vertical mill 50 for crushing the raw material and separating it into a first crushed material containing the cement raw material and a second crushed material having a size larger than the first crushed material; a derivation part 60 for obtaining the cement raw material from the first crushed material; a first sorting part 10 that sorts the second crushed material by eddy current separation into a sorted raw material 15 containing a metal content lower than that of the second crushed material, a first metal-containing material having a higher magnetic metal content than the first metal-containing material, and a second metal-containing material having a higher non-magnetic metal content than both the sorted raw material A and the first metal-containing material; a third sorting part 16 that sorts the second crushed material by a metal sorting device into a sorted raw material 17 containing a non-metal and a metal-containing material containing a magnetic metal; and a supply part 40 that supplies the sorted raw materials 15 and 17 to the vertical mill 50.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an apparatus and method for producing a cement raw material, an apparatus and method for producing cement clinker, and a method for producing a cement raw material intermediate. [Background technology]

[0002] In cement clinker manufacturing equipment, waste is used as part of the raw materials. If metals contained in the waste are directly supplied to the cement clinker manufacturing equipment, there is a concern that they may cause wear and damage to the equipment. For this reason, technologies for removing metals from waste are being studied.

[0003] For example, Patent Document 1 proposes a technology in which pulverized waste is separated into suitable waste of a size suitable for use as cement raw material or fuel and other waste, and metals are detected and recovered from the other waste using a magnetic field sensor. Patent Document 2 proposes a technology in which a vibration detection unit is provided to detect vibrations in the vertical mill, and when the vibrations reach a threshold value or higher, the system switches to sorting in the metals sorting unit, thereby reducing the burden on the vertical mill and downstream equipment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-153053 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-28477 Summary of the Invention [Problem to be solved by the invention]

[0005] Waste materials used as cement raw materials may include incineration ash and construction sludge. Incineration ash may contain metal fragments derived from municipal waste, such as water bottles, bicycle parts, dumbbells, and manhole covers. Construction sludge may contain metal fragments derived from rebar, pipes, and bolts that have been buried in landfills. The amount of metal contamination in waste has been increasing in recent years, and this trend is not expected to change significantly in the future.

[0006] Therefore, the present disclosure provides an apparatus and method for manufacturing a cement raw material, and an apparatus and method for manufacturing cement clinker, which can sufficiently reduce the load on manufacturing facilities by separating metals from waste with high accuracy, and also provides a method for manufacturing a cement raw material intermediate, which can sufficiently reduce the load on manufacturing facilities by separating metals from waste with high accuracy. [Means for solving the problem]

[0007] In one aspect, the present disclosure provides an apparatus for manufacturing a cement raw material using a raw material including waste containing metals, the apparatus comprising: a vertical mill that crushes the raw material and separates it into a first crushed material containing the cement raw material and a second crushed material having a size larger than the first crushed material; an outlet section that obtains the cement raw material from the first crushed material; a first sorting section that obtains, from the second crushed material, a sorted raw material having a lower metal content than the second crushed material by eddy current sorting; and a supply section that supplies the sorted raw material to the vertical mill.

[0008] The manufacturing apparatus includes a first sorting section that uses eddy current sorting to obtain a sorted raw material with a lower metal content than the second pulverized material from the second pulverized material separated in a vertical mill that pulverizes raw materials containing waste. The first sorting section uses eddy current sorting, which can sort metals with high accuracy, so that a sorted raw material with a reduced metal content can be obtained even if the waste contains not only magnetic metals such as iron but also non-magnetic metals such as aluminum, copper, and zinc. This allows for sufficient reduction of the metals contained in the sorted raw material supplied from the supply section to the vertical mill. This, in turn, allows for sufficient reduction of the load on the vertical mill and on downstream manufacturing equipment.

[0009] In the cement raw material manufacturing apparatus described above, the waste may contain magnetic metals and non-magnetic metals, and the first sorting unit may be configured to sort the second pulverized material by eddy current sorting into a sorted raw material, a first metal-containing material having a higher magnetic metal content than the sorted raw material, and a second metal-containing material having a higher non-magnetic metal content than the sorted raw material and the first metal-containing material. By sorting into the first metal-containing material and the second metal-containing material in this way, these can be recycled and effectively utilized, such as for resource recycling.

[0010] The cement raw material manufacturing apparatus may include a separation unit that separates cement raw material-containing deposits that adhere to metal flakes contained in at least one of the first metal-containing material and the second metal-containing material from the metal flakes to obtain a separated material containing the cement raw material. This allows for effective use of the cement raw material that adheres to the metal flakes contained in the first metal-containing material and the second metal-containing material, while increasing the metal content of the magnetic metal and non-magnetic metal, thereby increasing the added value of these as recycled raw materials.

[0011] The cement raw material manufacturing apparatus may include a second sorting section that removes at least some of the metals contained in waste, including at least one of municipal waste incineration ash and construction sludge, to reduce the metal content in the waste, and a raw material blending section that blends the waste with reduced metal content with non-waste to prepare a raw material. Municipal waste incineration ash and construction sludge may have a high metal content and contain large metal pieces. Therefore, the inclusion of the second sorting section can significantly reduce the load on manufacturing equipment, such as a vertical mill.

[0012] The discharge section may include a cyclone that recovers the first pulverized material contained in the gas flow from the vertical mill, and a bag filter that captures solids contained in the exhaust gas discharged from the cyclone. Since the first pulverized material has a reduced content of metals, including non-magnetic metals, wear and damage to the cyclone and bag filter can be sufficiently suppressed. Furthermore, the inclusion of the bag filter can sufficiently increase the recovery rate of the cement raw materials. The discharge section may also be composed of only the bag filter.

[0013] In one aspect, the present disclosure provides a cement clinker manufacturing apparatus including any one of the above-described cement raw material manufacturing apparatuses, a kiln, and an introduction section for introducing the cement raw material into the kiln. Because the cement clinker manufacturing apparatus includes any one of the above-described cement raw material manufacturing apparatuses, the load on the manufacturing facility can be sufficiently reduced.

[0014] In one aspect, the present disclosure provides a method for producing a cement raw material using a raw material containing metal-containing waste, the method comprising: a crushing and sorting step of crushing the raw material and sorting it into a first crushed material containing the cement raw material and a second crushed material having a size larger than the first crushed material; a extraction step of obtaining a cement raw material from the first crushed material; a sorting step of obtaining a sorted raw material having a lower metal content than the second crushed material by eddy current sorting from the second crushed material; and a circulation step of using the sorted raw material as part of the raw material for the crushing and sorting step.

[0015] In the manufacturing method described above, a second pulverized material is separated in a crushing and sorting process, which crushes raw materials containing waste. The second pulverized material is then sorted by eddy current sorting in the sorting process to obtain a sorted raw material with a lower metal content than the second pulverized material. Because the sorting process uses eddy current sorting, which can sort metals with high accuracy, a sorted raw material with a reduced metal content can be obtained even if the waste contains not only magnetic metals such as iron but also non-magnetic metals such as aluminum, copper, and zinc. Therefore, by using this sorted raw material as part of the raw material for the crushing and sorting process in the circulation process, the metal content of the raw material used in the crushing and sorting process can be sufficiently reduced. This significantly reduces the load on the manufacturing equipment.

[0016] In one aspect, the present disclosure provides a method for producing cement clinker, which includes a calcination step of introducing the cement raw material produced by the above-described method into a kiln and calcining it to obtain cement clinker. This production method uses the cement raw material produced by the above-described method for producing a cement raw material, and therefore can sufficiently reduce the load on the production equipment.

[0017] In one aspect, the present disclosure provides a method for producing a cement raw material intermediate for obtaining a cement raw material using a raw material including metal-containing waste, the method comprising: a step of sorting a raw material containing magnetic metals, non-magnetic metals, and non-metals derived from the waste by eddy current sorting into a cement raw material intermediate containing a cement raw material, a first metal-containing material having a higher magnetic metal content than the cement raw material intermediate, and a second metal-containing material having a higher non-magnetic metal content than the cement raw material intermediate and the first metal-containing material.

[0018] In the above-described manufacturing method, raw materials derived from waste are separated into a cement raw material intermediate, a first metal-containing material, and a second metal-containing material by eddy current sorting. The cement raw material intermediates obtained in this manner have reduced amounts of not only magnetic metals such as iron but also non-magnetic metals such as aluminum, copper, and zinc compared to the raw materials. Because the cement raw material intermediates obtained in this manner have a sufficiently reduced metal content, the load on the manufacturing equipment that crushes or refines the cement raw material intermediates to obtain cement raw materials can be significantly reduced. [Effects of the Invention]

[0019] The present disclosure can provide an apparatus and method for manufacturing a cement raw material, and an apparatus and method for manufacturing cement clinker, which can sufficiently reduce the load on manufacturing facilities by separating metals from waste with high accuracy. Also, the present disclosure can provide a method for manufacturing a cement raw material intermediate, which can sufficiently reduce the load on manufacturing facilities by separating metals from waste with high accuracy. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a diagram schematically illustrating an apparatus for producing cement raw materials and an apparatus for producing cement clinker according to an embodiment. FIG. [Figure 2] FIG. 1 is a diagram schematically illustrating an example of a cement clinker manufacturing apparatus. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings as needed. However, the following embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content.

[0022] Fig. 1 is a diagram showing a schematic diagram of a cement raw material manufacturing apparatus and a cement clinker manufacturing apparatus. The cement clinker manufacturing apparatus 200 in Fig. 1 includes a cement raw material manufacturing apparatus 100 and a calcination apparatus 150 that calcines the cement raw material obtained thereby to produce cement clinker.

[0023] The cement raw material manufacturing apparatus 100 is an apparatus for producing cement raw materials using raw materials containing metal-containing waste. The type of waste is not particularly limited, and examples include municipal waste incineration ash, coal ash bottom ash, fly ash; sludge such as construction sludge, sewage sludge, and inorganic sludge; landfill soil; concrete debris, foundry waste; slag such as slag, annealed slag, blast furnace slag, converter slag, electric furnace slag, and copper slag; iron oxide; ready-mix concrete sludge; sludge such as paper sludge; waste glass; waste clay; spent catalyst from a fluid catalytic cracker (FCC); and titanium neutralizer. Because the cement raw material manufacturing apparatus 100 can accurately separate metals from waste, it can also be used as raw materials for municipal waste incineration ash and construction sludge, which have relatively high metal contents. The metals contained in the waste may be metal pieces such as water bottles, bicycle parts, dumbbells, and manhole covers. The raw materials may include, as non-waste materials, raw cement material including limestone and silica stone.

[0024] The cement raw material manufacturing apparatus 100 includes a sorting unit 20 (second sorting unit) that removes at least some of the metals contained in the waste to reduce the metal content in the waste, and a raw material blending unit 30 that blends the waste with reduced metal content and cement raw ore to prepare raw materials for producing cement raw materials. The sorting unit 20 may be, for example, a metal sorting device equipped with a magnetic field sensor. Such a metal sorting device may be a commercially available multi-sorter (such as the "F600" manufactured by EarthTechnica Corporation). A multi-sorter is a device that determines the magnetic properties of objects (waste) passing through a belt conveyor by detecting the magnetic field of the objects (waste) and then uses compressed air to blow the objects (waste) off the belt conveyor to separate them into metals and non-metals. The sorting unit 20 may remove large pieces of metal from the waste.

[0025] The waste material whose metal content has been reduced in the sorting section 20 and non-waste material such as raw cement material ore are transported by a belt conveyor 22. During transport, metals such as iron pieces may be separated and removed from the raw materials using a commercially available magnetic separator. The waste material and raw cement material ore transported by the belt conveyor 22 are introduced into a raw material blending section 30 (raw material tank) and blended. Raw material 24 obtained by blending the waste material and raw cement material ore in the raw material blending section 30 is transported to a vertical mill 50 by a belt feeder 41 provided in a supplying section 40.

[0026] The vertical mill 50 pulverizes the raw material 24 supplied by the supply unit 40 and separates it into a first pulverized material containing cement raw material and a second pulverized material having a size larger than the first pulverized material. The second pulverized material also contains cement raw material, but the cement raw material content may be lower than that of the first pulverized material. The vertical mill 50 may be a known type equipped with a pulverizing section having pulverizing rollers and a pulverizing table, and a classifying section that classifies the pulverized material using an ascending gas flow. The first pulverized material obtained by the vertical mill 50 is fine, so it is discharged from the vertical mill 50 entrained by the ascending gas flow, flows through the discharge pipe 51, and is introduced into the outlet unit 60.

[0027] Meanwhile, larger pulverized material that is not entrained in the ascending gas flow is discharged as second pulverized material (discarded stone) from discharge section 52 at the bottom of vertical mill 50. The second pulverized material is larger in size than the first pulverized material and contains a large amount of metals, including magnetic and non-magnetic metals. The second pulverized material discharged from discharge section 52 is transported by belt conveyor 45, which transports the second pulverized material in a substantially horizontal direction, and bucket elevator 46, which transports the second pulverized material transported by belt conveyor 45 upward. The transported second pulverized material is introduced into sorting section 10 (first sorting section 10) and sorting section 16 (third sorting section).

[0028] The sorting unit 10 includes an eddy current sorter. An eddy current sorter is a sorting device that can separate materials into magnetic metals, non-magnetic metals, and non-metals by utilizing the repulsive force generated between eddy currents induced in metals when an AC magnetic field is applied to the metal and the AC magnetic field. Eddy current sorters are also preferable because they have superior processing capacity per unit time compared to conventional multi-sorters. The processing volume of the second pulverized material by the eddy current sorter may be, for example, 10 tons / hour or more. This allows the second pulverized material to be sorted with sufficiently high accuracy even when using a vertical mill 50 that discharges 10 tons / hour or more of the second pulverized material.

[0029] The sorting section 10 uses eddy current sorting to separate the second pulverized material into a sorted raw material 15 containing non-metals such as plastics and rubber, a first metal-containing material 11 having a higher magnetic metal content than the sorted raw material 15, and a second metal-containing material 12 having a higher non-magnetic metal content than the sorted raw material 15 and the first metal-containing material 11. Of the three sorted materials (sorted raw material 15, first metal-containing material 11, and second metal-containing material 12), sorted raw material 15 has the lowest metal content. Therefore, it contains the largest amount of components suitable for cement raw materials. Therefore, sorted raw material 15 can be introduced into raw material blending section 30 and used as a raw material. In other words, at least a portion of the second pulverized material is circulated and reused as a raw material. In this way, waste can be effectively utilized.

[0030] The first metal-containing material 11 has the highest content of magnetic metals, such as iron, of the three sorted materials. Because the first metal-containing material 11 was sorted by eddy current sorting, the proportion of magnetic metals is sufficiently high. This gives it high added value as a recyclable raw material, allowing for smooth recycling. The second metal-containing material 12 has the highest content of non-magnetic metals, such as aluminum, copper, and zinc, of the three sorted materials. Because the second metal-containing material 12 was also sorted by eddy current sorting, the proportion of non-magnetic metals is sufficiently high. This gives it high added value as a recyclable raw material, allowing for smooth recycling.

[0031] The separation unit 80 separates at least a portion of the deposits adhering to the non-magnetic metal pieces contained in the second metal-containing material 12 from the second metal-containing material 12 by vibration to obtain a separated material containing the cement raw material. This further increases the proportion of non-magnetic metals in the second metal-containing material 12. For example, a vibrating feeder may be used for separation by vibration. Since the separated material contains the cement raw material, it may be introduced into the raw material blending unit 30. Furthermore, if the separated material is fine, it may be introduced into the discharge unit 60 and merged with the first pulverized material. The provision of the separation unit 80 not only enables the cement raw material to be effectively utilized, but also further increases the content of non-magnetic metals contained in the second metal-containing material 12. This further increases the added value of the second metal-containing material 12 as a recycled raw material. In a modified example, the separation unit 80 may further include, in addition to the vibrating feeder, a device for separating the deposits adhering to the metal pieces from the second metal-containing material 12 by water washing and / or wind power to obtain the separated material. In another modification, the separator 80 may not be provided.

[0032] In yet another variation, a separation section 80 may be added, and, similar to the second metal-containing material 12, at least a portion of the deposits adhering to the magnetic metal pieces contained in the first metal-containing material 11 may be separated by vibration to obtain a separated material. Since this separated material also contains cement raw material, it may be introduced into the raw material blending section 30, or, if it is fine, it may be introduced into the discharge section 60 and merged with the first pulverized material. This not only enables the cement raw material to be effectively utilized, but also further increases the content of magnetic metal contained in the first metal-containing material 11. This further increases the added value of the first metal-containing material 11 as a recycled raw material.

[0033] The cement raw material manufacturing apparatus 100 is equipped with a sorting section 10 having an eddy current separator, and separates the second pulverized material into three sorted materials (sorted raw material 15, first metal-containing material 11, and second metal-containing material 12). This allows for a sufficient reduction in non-magnetic metals contained in the cement raw material compared to using a magnetic separator that can only separate magnetic materials and other materials. Furthermore, the eddy current separator can separate magnetic metals, non-magnetic metals, and non-metals with sufficiently high accuracy. Therefore, even if the amount of metal contained in the waste increases, it is possible to sufficiently reduce both magnetic and non-magnetic metals contained in the cement raw material.

[0034] In addition to the sorting unit 10, the cement raw material manufacturing apparatus 100 is equipped with a sorting unit 16 (third sorting unit) that sorts the second pulverized material into sorted raw materials 17 containing non-metals and metal-containing materials containing magnetic metals. The sorting unit 16 may be a metal sorting device equipped with a magnetic field sensor. An example of such a metal sorting device is a commercially available multi-sorter (such as the "F600" manufactured by EarthTechnica Corporation). The multi-sorter may be similar to the one described above. The provision of such a sorting unit 16 can improve the production capacity of the cement raw material manufacturing apparatus 100. The sorted raw materials 17 containing non-metals sorted in the sorting unit 16 may contain non-magnetic metals. The sorted raw materials 17 are introduced into the raw material blending unit 30 together with the sorted raw materials 15 sorted in the sorting unit 10, and become raw materials 24. Larger non-magnetic metal pieces may be crushed in the vertical mill 50 and included in the first crushed material, or may be discharged again from the discharge section 52 as the second crushed material and circulated to the sorting section 10 and the sorting section 16. In the sorting section 10, the non-magnetic metals circulated in this manner can be sorted as second metal-containing materials 12.

[0035] In a modified example of the cement raw material manufacturing apparatus 100, the sorting unit 16 may not be provided. In this case, the second pulverized material is separated in the sorting unit 10. Even when both the sorting unit 10 and the sorting unit 16 are provided, the apparatus may switch between a mode in which both the sorting unit 10 and the sorting unit 16 are operated and a mode in which only the sorting unit 10 is operated, depending on the proportion of non-magnetic metals in the waste or the processing volume. Furthermore, the apparatus may have multiple sorting units 10 and / or multiple sorting units 16.

[0036] In the raw material blending section 30, the waste and raw cement material ore from the belt conveyor 22, the sorted raw material 15 from the sorting section 10, and the sorted raw material 17 from the sorting section 16 are blended. These are introduced as raw materials into the vertical mill 50. The first pulverized material separated in the vertical mill 50 flows through the discharge pipe 51 and is introduced into the discharge section 60.

[0037] The discharge section 60 includes a cyclone 62 that recovers the first pulverized material contained in the gas flow from the vertical mill 50, and a bag filter 64 downstream of the cyclone 62 that captures solids (fine particles) contained in the exhaust gas discharged from the cyclone 62. The solids captured by the bag filter 64 may be blended with the cement raw materials or cement clinker. This can sufficiently increase the recovery rate of the cement raw materials and the yield of cement clinker. Since the first pulverized material has a particularly reduced content of non-magnetic metals, wear and damage to the cyclone 62 and the bag filter 64 can be sufficiently suppressed. The means for recovering the first pulverized material from the exhaust gas is not particularly limited. For example, an electrostatic precipitator may be used instead of the bag filter 64. However, from the viewpoint of increasing the recovery rate of the cement raw materials, it is preferable to provide the bag filter 64. This can also suppress wear on the exhaust gas flue downstream of the bag filter 64.

[0038] The first pulverized material obtained in this manner in the outlet section 60 can be used as a cement raw material. The cement raw material obtained in the cement raw material manufacturing apparatus 100 is introduced into the calcination apparatus 150.

[0039] Fig. 2 is a schematic diagram showing an example of a cement raw material burning device provided in a cement clinker manufacturing apparatus. The burning device 150 in Fig. 2 includes an introduction section 151 into which the cement raw material is introduced and preheated and calcined, a kiln 152 that burns the preheated and calcined cement raw material to obtain cement clinker, and a clinker cooler 153 that cools the cement clinker obtained in the kiln 152. The introduction section 151 has four cyclones C1, C2, C3, and C4 (preheaters) and a calciner 112.

[0040] The kiln end 122 of the kiln 152 and the calciner 112 in the introduction section 151 are connected by a rising duct 114. A probe 142 is connected to the rising duct 114, which extracts the exhaust gas in the rising duct 114 and introduces the extracted gas into the chlorine bypass 140.

[0041] The chlorine bypass 140 has, in this order from the probe 142 side, a cooling section 143 that cools the bleed gas, a chamber 145, a heat exchanger 146, a dust collector 147, and a suction fan 148. The bleed gas is cooled to a temperature below the melting point of the volatile alkali salt in the cooling section 143 and the heat exchanger 146. Chlorine bypass dust contained in the bleed gas that precipitates as the gas is cooled is collected in the dust collector 147. The exhaust gas discharged from the suction fan 148 may be introduced into a clinker cooler 153, for example, as a cooling gas for cement clinker. By providing the chlorine bypass 140, the volatile components in the calciner 150 can be reduced.

[0042] The cement raw material introduced from the connection between cyclones C1 and C2 in the introduction section 151 flows through cyclones C1, C2, C3, the rising duct 114, the calciner 112, and C4 before reaching the kiln end 122 of the kiln 152. In the kiln 152, the preheated and calcined cement raw material is heated by combustion in a burner 124 provided at the rear end of the main body 126 to form cement clinker. The resulting cement clinker is cooled in the clinker cooler 153. After being cooled in the clinker cooler 153, cement clinker is obtained. Since the calcination device 150 uses cement raw material with a reduced metal content, wear on the equipment can be suppressed. This can sufficiently reduce the load on the production equipment. Furthermore, the metal content in the resulting cement clinker can be sufficiently reduced. The kiln exhaust gas discharged from the cyclone C1 may be introduced as hot air into a vertical mill 50 as shown in FIG. 1, and used to separate the first pulverized material from the second pulverized material.

[0043] A method for producing a cement raw material according to one embodiment includes a sorting step (second sorting step) for reducing the metal content of the waste, a raw material blending step for blending the waste with a cement raw material ore to prepare a raw material for producing a cement raw material, a crushing and sorting step for crushing the prepared raw material and separating it into a first crushed material containing the cement raw material and a second crushed material larger in size than the first crushed material, a extraction step for obtaining a cement raw material from the first crushed material, a sorting step (first sorting step) for obtaining a sorted raw material having a lower metal content than the second crushed material by eddy current sorting from the second crushed material, and a circulation step for using the sorted raw material as part of the raw material for the crushing and sorting step. This production method may be performed using the cement raw material production apparatus 100 described above or a variation thereof.

[0044] The second sorting step can be performed using the second sorting section 20. The raw material blending step can be performed using the raw material blending section 30. The crushing and sorting step can be performed using the vertical mill 50. The discharge step can be performed using the discharge section 60. The first sorting step can be performed using the first sorting section 10. As with the cement raw material manufacturing apparatus 100, a third sorting step using the third sorting section 16 may be performed in parallel with the second sorting step. The circulation step may be performed by introducing the sorted raw material 15 obtained in the first sorting step into the raw material blending section 30, or by introducing both the sorted raw material 15 and the sorted raw material 17 obtained in the third sorting step into the raw material blending section 30. In this case, the sorted raw material 15, or the sorted raw material 15 and the sorted raw material 17, are introduced as part of the raw material 24 to be crushed in the vertical mill 50. As such, each of the above-mentioned steps can be performed based on the description of the cement raw material manufacturing apparatus 100. Therefore, the description of the cement raw material manufacturing apparatus 100 also applies to the cement raw material manufacturing method of this embodiment.

[0045] According to the manufacturing method of this embodiment, a sorted raw material with a low metal content is obtained by eddy current sorting in the first sorting step from the second pulverized material separated in the crushing and sorting step, which crushes raw material 24 containing waste. Because eddy current sorting is used in the first sorting step, when the waste contains not only magnetic metals such as iron but also non-magnetic metals such as aluminum, copper, and zinc, a sorted raw material with a reduced content of non-magnetic metals can be obtained. By using this sorted raw material 15 (17) as part of the raw material for the crushing and sorting step in the circulation step, the metal content of raw material 24 used in the crushing and sorting step can be sufficiently reduced. Therefore, the load on the manufacturing equipment can be sufficiently reduced. The first metal-containing material 11 containing magnetic metals and the second metal-containing material 12 containing non-magnetic metals obtained in the first sorting step have high added value as recycled raw materials.

[0046] A method for producing cement clinker according to one embodiment includes a calcination step in which the cement raw material produced by the above-described method is introduced into a kiln and calcined to obtain cement clinker. This production method may be performed using the cement clinker production apparatus 200 shown in FIG. 1 or a modified example thereof. The calcination step may also be performed using the calcination apparatus 150 shown in FIG. 2 or a modified example thereof. Therefore, the description of the cement clinker production apparatus 200 and the calcination apparatus 150 also applies to the method for producing cement raw material according to this embodiment.

[0047] In the above-described method for producing cement clinker, a cement raw material with a reduced metal content is used, thereby suppressing equipment wear. Therefore, the load on the production equipment can be sufficiently reduced. Furthermore, cement clinker with a sufficiently reduced metal content can be produced. By blending such cement clinker with gypsum or other raw materials, a cement composition with a sufficiently reduced metal content can be produced. Furthermore, magnetic metals and non-magnetic metals can be recovered from waste with high precision, resulting in high-value-added recycled raw materials.

[0048] In one embodiment, a method for producing a cement raw material intermediate uses raw materials containing metal-containing waste to produce a cement raw material intermediate for obtaining a cement raw material. The cement raw material intermediate is used to produce a cement raw material to be introduced into a kiln, and may contain crushed cement raw material ore, as well as crushed waste-derived components such as plastics, combustible materials, magnetic metals, and non-magnetic metals derived from the waste. The method for producing a cement raw material intermediate may be performed using the sorting unit 10 in the cement raw material production apparatus 100 shown in FIG. 1 described above.

[0049] When the sorting unit 10 is used, the second pulverized material (waste rock) obtained in the vertical mill 50 is used as a raw material in the method for producing a cement raw material intermediate. The second pulverized material contains magnetic metals and non-magnetic metals in addition to the cement raw material. This second pulverized material is sorted into a cement raw material intermediate containing the cement raw material, a first metal-containing material having a higher magnetic metal content than the cement raw material intermediate, and a second metal-containing material having a higher non-magnetic metal content than the cement raw material intermediate and the first metal-containing material. This process allows the production of a cement intermediate with reduced contents of both magnetic and non-magnetic metals. The cement raw material intermediate obtained by this production method can be used to produce cement raw materials, cement clinker, and cement compositions with sufficiently reduced metal contents. Furthermore, magnetic and non-magnetic metals can be recovered with high precision from waste and used as high-value-added recycled raw materials.

[0050] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. [Explanation of symbols]

[0051] 10...Sorting section (first sorting section), 11...First metal-containing material, 12...Second metal-containing material, 15, 17...Sorted raw material, 16...Sorting section (third sorting section), 20...Sorting section (second sorting section), 22...Belt conveyor, 24...Raw material, 30...Raw material blending section, 40...Supply section, 41...Belt feeder, 45...Belt conveyor, 46...Bucket elevator, 50...Vertical mill, 51...Discharge pipe, 52...Discharge section, 60...Outlet section, 62...Cyclone, 64...Bag filter 146...heat exchanger, 147...dust collector, 148...suction fan, 150...calciner, 151...introduction section, 152...kiln, 153...clinker cooler, 200...cement clinker manufacturing apparatus.

Claims

1. An apparatus for manufacturing a cement raw material using a raw material containing metal-containing waste, a vertical mill that pulverizes the raw material and separates the raw material into a first pulverized material containing the cement raw material and a second pulverized material having a size larger than that of the first pulverized material; an outlet section for obtaining the cement raw material from the first pulverized material; a first sorting unit that sorts the second pulverized material by eddy current sorting into a sorted raw material A having a lower metal content than the second pulverized material, a first metal-containing material having a higher magnetic metal content than the sorted raw material A, and a second metal-containing material having a higher non-magnetic metal content than the sorted raw material A and the first metal-containing material; a third sorting unit that sorts the second pulverized material into a sorted raw material B containing non-metals and a metal-containing material containing magnetic metals using a metal sorting device; a supply unit that supplies the selected raw material A, or the selected raw material A and the selected raw material B, to the vertical mill; a mode in which both the first sorting unit and the third sorting unit are operated; a mode in which only the first sorting section is operated among the first sorting section and the third sorting section, and

2. 2. The cement raw material manufacturing apparatus according to claim 1, further comprising a separation unit that separates deposits containing the cement raw material that adhere to metal pieces contained in at least one of the first metal inclusion and the second metal inclusion from the metal pieces to obtain a separated material containing the cement raw material.

3. The cement raw material manufacturing apparatus according to claim 2 , wherein the separating unit includes a vibrating feeder.

4. a second sorting unit that removes at least a portion of the metals contained in the waste, which includes at least one of municipal waste incineration ash and construction sludge, to reduce the content of the metals in the waste; 4. The cement raw material manufacturing apparatus according to claim 1, further comprising: a raw material blending section that prepares the raw material by blending the waste material with a reduced metal content and non-waste material.

5. 5. The cement raw material manufacturing apparatus according to claim 1, wherein the outlet section comprises: a cyclone that recovers the first pulverized material contained in the gas flow from the vertical mill; and a bag filter that captures solids contained in the exhaust gas discharged from the cyclone.

6. The cement raw material manufacturing apparatus according to any one of claims 1 to 5, Kiln and an introduction section that introduces the cement raw material into the kiln.

7. A method for producing a cement raw material using a raw material containing metal-containing waste, a crushing and sorting step of crushing the raw material and sorting it into a first crushed material containing the cement raw material and a second crushed material having a size larger than that of the first crushed material; a extraction step of obtaining the cement raw material from the first pulverized material; a first sorting step of sorting the second pulverized material by eddy current sorting into a sorted material A having a lower content of the metal than the second pulverized material, a first metal-containing material having a higher content of magnetic metal than the sorted material A, and a second metal-containing material having a higher content of the non-magnetic metal than the sorted material A and the first metal-containing material; a second sorting step in which the second pulverized material is sorted into a sorted raw material B containing non-metals and a metal-containing material containing magnetic metals using a metal sorting device; a circulation process in which the selected raw material A, or the selected raw material A and the selected raw material B, are used as part of the raw material in the pulverization and separation process, a mode in which the first sorting step and the second sorting step are performed in parallel; a mode in which only the first sorting step is performed among the first sorting step and the second sorting step.

8. A method for producing cement clinker, comprising a calcining step of introducing the cement raw material produced by the method according to claim 7 into a kiln and calcining it to obtain cement clinker.

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