Apparatus and method for manufacturing cement raw material, and apparatus and method for manufacturing 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 manufacturing cement raw materials, an apparatus and method for manufacturing cement clinker, and a method for manufacturing cement raw material intermediates.

Background Art

[0002] In an apparatus for manufacturing cement clinker, waste is used as part of the raw materials. If the metals contained in the waste are directly supplied to the manufacturing equipment for cement clinker, there is a concern that wear and damage of the equipment may occur. For such reasons, technologies for removing metals from waste have been studied.

[0003] For example, in Patent Document 1, a technology has been proposed in which crushed waste is sorted into suitable waste having a size suitable for cement raw materials or fuel and other separate waste, and metals are detected and recovered from the separate waste using a magnetic field sensor. In Patent Document 2, a technology has been proposed in which a vibration detection unit for detecting the vibration of a vertical mill is provided, and when the vibration exceeds a threshold value, the selection is switched to be performed by a metal sorting unit, thereby reducing the burden on the vertical mill and the downstream equipment thereof.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Wastes used as cement raw materials may include incineration ash and construction sludge. Among these, incineration ash may contain metal pieces derived from municipal waste such as water cylinders, bicycle parts, dumbbells, and manhole covers. Also, construction sludge may contain metal pieces derived from, for example, reinforcing bars, pipes, and bolts that were buried. In recent years, the amount of metal mixed in waste has been on an increasing trend, and this trend is not likely to change significantly in the future.

[0006] Therefore, the present disclosure provides a cement raw material manufacturing apparatus and a manufacturing method capable of sufficiently reducing the load on manufacturing equipment by highly accurately separating metal from waste, and a cement clinker manufacturing apparatus and a manufacturing method. Also, a manufacturing method of a cement raw material intermediate capable of sufficiently reducing the load on manufacturing equipment by highly accurately separating metal from waste is provided.

Means for Solving the Problems

[0007] In one aspect, the present disclosure is a cement raw material manufacturing apparatus using a raw material containing waste containing metal, comprising: a vertical mill that pulverizes the raw material and separates it into a first pulverized material containing a cement raw material and a second pulverized material having a size larger than that of the first pulverized material; a derivation unit that obtains a cement raw material from the first pulverized material; a first separation unit that obtains a separated raw material having a lower metal content than the second pulverized material from the second pulverized material by eddy current separation; and a supply unit that supplies the separated raw material to the vertical mill.

[0008] The above manufacturing apparatus includes a first separation unit that obtains a separated raw material with a lower metal content than the second pulverized material from the second pulverized material separated in a vertical mill that pulverizes a raw material containing waste by eddy current separation. In the first separation unit, since eddy current separation capable of separating metals with high precision is used, even if the waste contains not only ferromagnetic metals such as iron but also non-ferromagnetic metals such as aluminum, copper, and zinc, a separated raw material with a reduced metal content can be obtained. Therefore, the metals contained in the separated raw material supplied from the supply unit to the vertical mill can be sufficiently reduced. Accordingly, the loads on the vertical mill and the manufacturing equipment on its downstream side can be sufficiently reduced.

[0009] In the above cement raw material manufacturing apparatus, the waste contains ferromagnetic and non-ferromagnetic metals, and the first separation unit may be configured to separate the second pulverized material by eddy current separation into a separated raw material, a first metal inclusion with a higher ferromagnetic metal content than the separated raw material, and a second metal inclusion with a higher non-ferromagnetic metal content than the separated raw material and the first metal inclusion. In this way, by separating into the first metal inclusion and the second metal inclusion, they can be recycled respectively for effective utilization such as recycling.

[0010] The above cement raw material manufacturing apparatus may include a separation unit that separates an adherent containing a cement raw material adhering to metal pieces included in at least one of the first metal inclusion and the second metal inclusion from the metal pieces to obtain a separated product containing the cement raw material. Thereby, while aiming at effective utilization of the cement raw material adhering to the metal pieces included in the first metal inclusion and the second metal inclusion, the metal contents of the ferromagnetic and non-ferromagnetic metals can be increased, and the added value as recycled raw materials for these can be enhanced.

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

[0012] The above-derived unit may include a cyclone that recovers the first pulverized material contained in the gas flow from the vertical mill from the gas flow, and a bag filter that captures the solid content contained in the exhaust gas discharged from the cyclone. In the first pulverized material, since the content of the metal including the non-magnetic metal is reduced, wear and damage of the cyclone and the bag filter can be sufficiently suppressed. Further, by having a bag filter, the recovery rate of the cement raw material can be made sufficiently high. Note that the derived unit may be composed of only a bag filter.

[0013] In one aspect, the present disclosure provides a cement clinker manufacturing apparatus including any of the above cement raw material manufacturing apparatuses, a kiln, and an introduction unit that introduces the cement raw material into the kiln. Since this cement clinker manufacturing apparatus includes any of the above cement raw material manufacturing apparatuses, the load on the manufacturing equipment can be sufficiently reduced.

[0014] In one aspect, the present disclosure provides a method for manufacturing a cement raw material using a raw material containing waste containing metal, the method including a pulverizing and sorting step of pulverizing the raw material and separating it 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, a deriving step of obtaining the cement raw material from the first pulverized material, a sorting step of obtaining a sorted raw material having a lower metal content than the second pulverized material from the second pulverized material by eddy current sorting, and a circulating step of using the sorted raw material as a part of the raw material in the pulverizing and sorting step.

[0015] In the above manufacturing method, in the pulverization and separation step of pulverizing the raw material containing waste, a separated raw material for sorting is obtained from the second pulverized material separated in the sorting step by eddy current sorting, and the metal content is lower than that of the second pulverized material. In this way, in the sorting step, since eddy current sorting capable of sorting metals with high precision is used, even if 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 metal content can be obtained. Therefore, by using this sorted raw material as part of the raw material for the pulverization and separation step in the circulation step, the metal contained in the raw material used in the pulverization and separation step can be sufficiently reduced. Accordingly, the load on the manufacturing equipment can be sufficiently reduced.

[0016] In one aspect, the present disclosure provides a method for manufacturing cement clinker, which has a firing step of introducing the cement raw material manufactured by the above manufacturing method into a kiln and firing it to obtain cement clinker. Since this manufacturing method uses the cement raw material manufactured by the above manufacturing method for cement raw materials, the load on the manufacturing equipment can be sufficiently reduced.

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

[0018] The above manufacturing method sorts raw materials derived from waste into a cement raw material intermediate, a first metal inclusion, and a second metal inclusion by eddy current separation. The cement raw material intermediate thus obtained has a reduced content not only of magnetic metals such as iron but also of non-magnetic metals such as aluminum, copper, and zinc, compared to the raw materials. Since the metal content of the cement raw material intermediate thus obtained is sufficiently reduced, the load on the manufacturing equipment for obtaining the cement raw material by pulverizing or purifying the cement raw material intermediate can be sufficiently reduced.

Effects of the Invention

[0019] The present disclosure can provide a manufacturing apparatus and a manufacturing method for a cement raw material, and a manufacturing apparatus and a manufacturing method for a cement clinker, which can sufficiently reduce the load on the manufacturing equipment by accurately sorting metals from waste. Further, a manufacturing method for a cement raw material intermediate capable of sufficiently reducing the load on the manufacturing equipment by accurately sorting metals from waste can be provided.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. However, the following embodiments are examples for explaining the present invention and are not intended to limit the present invention to the following contents.

[0022] FIG. 1 is a diagram schematically showing a cement raw material production apparatus and a cement clinker production apparatus. The cement clinker production apparatus 200 in FIG. 1 includes a cement raw material production apparatus 100 and a firing apparatus 150 that fires the cement raw material obtained thereby to produce cement clinker.

[0023] The cement raw material production apparatus 100 is an apparatus that produces a cement raw material using a raw material containing waste containing metal. The type of waste is not particularly limited. For example, municipal waste incineration ash, main ash of coal ash (bottom ash), fly ash; sludge such as construction sludge, sewage sludge, and inorganic sludge; landfill soil; concrete scraps, foundry scraps; slag such as water granulated slag, chilled slag, blast furnace slag, converter slag, electric furnace slag, and copper slag; iron oxide; raw sludge; sludge such as paper sludge; waste glass; waste clay; used catalyst of a fluid catalytic cracking unit (FCC); and a Ti neutralizer. Since the cement raw material production apparatus 100 can accurately separate metal from waste, among the above, municipal waste incineration ash and construction sludge having a relatively high metal content can also be used as raw materials without problems. The metal contained in the waste may be metal pieces such as a water cylinder, bicycle parts, dumbbells, and manhole covers. The raw material may include, as non-waste, a cement raw material raw stone containing limestone and silica.

[0024] The cement raw material manufacturing apparatus 100 includes a sorting section 20 (second sorting section) that removes at least a part of the metals contained in the waste to reduce the metal content in the waste, and a raw material blending section 30 that blends the waste with the reduced metal content with cement raw material ore to prepare a raw material for manufacturing a cement raw material. The sorting section 20 may be, for example, a metal sorting device equipped with a magnetic field sensor. As such a metal sorting device, a commercially available multi-sorter (such as "F600" manufactured by EarthTechnica Corporation) may be used. Note that the multi-sorter is a device that determines magnetism by detecting the magnetic field of objects (waste) passing on a belt conveyor, and further blows the objects (waste) blown off the belt conveyor with compressed air to separate metals and non-metals. The sorting section 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 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 transported by the belt conveyor 22 are introduced into a raw material blending section 30 (raw material tank) and blended. The raw material 24 obtained by blending the waste material and raw cement material 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 the cement raw material and a second pulverized material having a size larger than that of the first pulverized material. The second pulverized material also contains the cement raw material, but the content of the cement raw material may be lower than that of the first pulverized material. The vertical mill 50 may be a known one having a pulverizing section having a pulverizing roller and a pulverizing table, and a classifying section that classifies the pulverized material by 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 accompanied by the ascending gas flow, and is introduced into the discharge unit 60 through the discharge pipe 51.

[0027] On the one hand, large-sized pulverized materials that are not entrained by the upward gas flow are discharged as second pulverized materials (discharged stones) from the discharge section 52 at the lower part of the vertical mill 50. The second pulverized materials are larger in size than the first pulverized materials and contain more metals including magnetic metals and non-magnetic metals. The second pulverized materials discharged from the discharge section 52 are conveyed by a belt conveyor 45 that conveys the second pulverized materials in a substantially horizontal direction and a bucket elevator 46 that conveys the second pulverized materials conveyed by the belt conveyor 45 upward. The conveyed second pulverized materials are introduced into a sorting section 10 (first sorting section 10) and a sorting section 16 (third sorting section).

[0028] The sorting section 10 is equipped with an eddy current separator. An eddy current separator is a sorting device that can sort objects to be sorted into magnetic metals, non-magnetic metals, and non-metals by utilizing the repulsive force generated between the eddy current induced in a metal when an alternating magnetic field is applied to the metal and the alternating magnetic field. The eddy current separator is also preferable in that it has an excellent processing capacity per unit time compared to the conventionally used multi-sorter. The processing amount of the second pulverized materials by the eddy current separator may be, for example, 10 tons / hour or more. Thereby, even when using a vertical mill 50 that discharges second pulverized materials at 10 tons / hour or more, the second pulverized materials can be sorted with sufficiently high accuracy.

[0029] The sorting section 10 sorts the second pulverized materials into a sorting raw material 15 containing non-metals such as plastics and rubber by eddy current sorting, a first metal inclusion 11 having a higher content of magnetic metal than the sorting raw material 15, and a second metal inclusion 12 having a higher content of non-magnetic metal than the sorting raw material 15 and the first metal inclusion 11. The sorting raw material 15 has the lowest metal content among the three sorted materials (sorting raw material 15, first metal inclusion 11, and second metal inclusion 12). Therefore, it contains the most components suitable as a cement raw material. Thus, the sorting raw material 15 can be introduced into the raw material blending section 30 and used as a raw material. That is, at least a part of the second pulverized materials is recycled and reused as a raw material. In this way, effective utilization of waste can be achieved.

[0030] The first metal inclusion 11 has the highest content of magnetic metals such as iron among the three separated materials. Since the first metal inclusion 11 is separated by eddy current separation, the proportion of magnetic metals is sufficiently high. Therefore, the added value as a recycling raw material is high, and recycling can be carried out smoothly. The second metal inclusion 12 has the highest content of non-magnetic metals such as aluminum, copper, and zinc among the three separated materials. Since the second metal inclusion 12 is also separated by eddy current separation, the proportion of non-magnetic metals is sufficiently high. Therefore, the added value as a recycling raw material is high, and recycling can be carried out smoothly.

[0031] The separation unit 80 separates at least a part of the deposits adhering to the metal pieces of the non-magnetic metals contained in the second metal inclusion 12 from the second metal inclusion 12 by vibration to obtain a separated material containing a cement raw material. Thereby, the proportion of non-magnetic metals in the second metal inclusion 12 can be further increased. For separation by vibration, for example, a vibrating feeder may be used. Since the separated material contains a cement raw material, it may be introduced into the raw material blending unit 30. Also, when the separated material is fine particles, it may be introduced into the discharge unit 60 and merged with the first pulverized material. By providing the separation unit 80, not only can the cement raw material be effectively utilized, but also the content of non-magnetic metals contained in the second metal inclusion 12 can be further increased. Thereby, the added value of the second metal inclusion 12 as a recycling raw material can be further increased. In a modified example, the separation unit 80 may further include a device that separates deposits adhering to metal pieces from the second metal inclusion 12 by water washing and / or wind power in addition to the vibrating feeder to obtain a separated material. In another modified example, the separation unit 80 may not be provided.

[0032] In yet another modification, a separation unit 80 may be additionally provided to separate at least a part of the deposits adhering to the metal pieces of the magnetic metal contained in the first metal inclusion 11 by vibration in the same manner as the second metal inclusion 12 to obtain a separated product. Since this separated product also contains a cement raw material, it may be introduced into the raw material blending unit 30, or if it is fine particles, it may be introduced into the discharge unit 60 and merged with the first pulverized product. As a result, not only can the cement raw material be effectively utilized, but also the content of the magnetic metal contained in the first metal inclusion 11 can be further increased. Thereby, the added value of the first metal inclusion 11 as a recycled raw material can be further increased.

[0033] The cement raw material manufacturing apparatus 100 includes a sorting unit 10 having an eddy current separator, and thereby sorts the second pulverized product into three sorted products (sorted raw material 15, first metal inclusion 11, and second metal inclusion 12). As a result, the non-magnetic metal contained in the cement raw material can be sufficiently reduced as compared with the case of using a magnetic separator that can only separate into a magnetic material and the other two. In addition, the eddy current separator can separate magnetic metals, non-magnetic metals, and non-metals with sufficiently high accuracy. Therefore, even when the amount of metal contained in the waste increases, both the magnetic metal and the non-magnetic metal contained in the cement raw material can be sufficiently reduced.

[0034] The cement raw material manufacturing apparatus 100 includes, in addition to the sorting section 10, a sorting section 16 (third sorting section) that sorts the second pulverized material into sorted raw materials 17 containing nonmetals and metal-containing materials containing magnetic metals. The sorting section 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 "F600" manufactured by EarthTechnica Corporation). The multi-sorter may be the same as the one described above. By including such a sorting section 16, the manufacturing capacity of the cement raw material manufacturing apparatus 100 can be improved. The sorted raw materials 17 containing nonmetals sorted in the sorting section 16 may contain nonmagnetic metals. The sorted raw materials 17 are introduced into the raw material blending section 30 together with the sorted raw materials 15 sorted in the sorting section 10, and become raw materials 24. Larger non-magnetic metal pieces may be pulverized in the vertical mill 50 and included in the first pulverized material, or may be discharged again from the discharge section 52 as the second pulverized material and circulated to the sorting section 10 and the sorting section 16. In the sorting section 10, the non-magnetic metal circulated in this manner can be sorted as the second metal-containing material 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 amount of waste to be processed. Also, 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 extraction unit 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 that captures the solid content (fine particles) contained in the exhaust gas discharged from the cyclone 62 on the downstream side of the cyclone 62. The solid content captured by such a bag filter 64 may be blended into the cement raw material or the cement clinker. Thereby, the recovery rate of the cement raw material and the yield of the cement clinker can be made sufficiently high. Since the content of non-magnetic metal in the first pulverized material is particularly reduced, wear and damage of 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 material, it is preferable to provide the bag filter 64. Thereby, wear of the flue of the exhaust gas on the downstream side of the bag filter 64 can also be suppressed.

[0038] The first pulverized material obtained by the extraction unit 60 in this way can be used as a cement raw material. The cement raw material obtained by the cement raw material production apparatus 100 is introduced into the firing apparatus 150.

[0039] FIG. 2 is a diagram schematically showing an example of a firing apparatus for a cement raw material provided in a cement clinker production apparatus. The firing apparatus 150 in FIG. 2 includes an introduction unit 151 into which a cement raw material is introduced and preheated and calcined, a kiln 152 that fires the preheated and calcined cement raw material to obtain a cement clinker, and a clinker cooler 153 that cools the cement clinker obtained in the kiln 152. The introduction unit 151 has four cyclones C1, C2, C3, C4 (preheater) and a calcining furnace 112.

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

[0041] The chlorine bypass 140 has, in this order from the probe 142 side, a cooling section 143 for cooling the extraction gas, a chamber 145, a heat exchanger 146, a dust collector 147, and a suction fan 148. The extraction 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. The chlorine bypass dust contained in the extraction gas, which precipitates upon cooling, is collected by the dust collector 147. The exhaust gas discharged from the suction fan 148 may be introduced into the clinker cooler 153 as, for example, the cooling gas for the cement clinker. By providing the chlorine bypass 140, the volatile components in the firing apparatus 150 can be reduced.

[0042] The cement raw material introduced from the connection part between the cyclone C1 and the cyclone C2 of the introduction part 151 flows through the cyclone C1, the cyclone C2, the cyclone C3, the rising duct 114, the precalciner 112, and the cyclone C4 and reaches the kiln end 122 of the kiln 152. In the kiln 152, the preheated and precalcined cement raw material is heated by the combustion of the burner 124 provided on the rear end side of the main body part 126 to become cement clinker. The obtained cement clinker is cooled by the clinker cooler 153. After being cooled by the clinker cooler 153, cement clinker is obtained. In the firing apparatus 150, since a cement raw material with a reduced metal content is used, wear of the equipment can be suppressed. Therefore, the load on the manufacturing equipment can be sufficiently reduced. Also, the metal content contained in the obtained cement clinker can be sufficiently reduced. The kiln exhaust gas discharged from the cyclone C1 may be introduced as hot air into the vertical mill 50 as shown in FIG. 1 and used for separating the first pulverized material and the second pulverized material.

[0043] The manufacturing method of cement raw materials according to one embodiment includes a sorting step (second sorting step) for reducing the metal content in waste, a raw material blending step for blending the waste with a reduced metal content and cement raw material rough stones to prepare a raw material for manufacturing cement raw materials, a grinding and separation step for grinding the prepared raw material and separating it into a first ground product containing cement raw materials and a second ground product having a size larger than that of the first ground product, a derivation step for obtaining cement raw materials from the first ground product, a sorting step (first sorting step) for obtaining a sorted raw material with a lower metal content than the second ground product from the second ground product by eddy current sorting, and a circulation step for using the sorted raw material as part of the raw material in the grinding and separation step. This manufacturing method may be carried out using the above-described cement raw material manufacturing apparatus 100 or a modified example thereof.

[0044] The second sorting step can be carried out using the second sorting unit 20. The raw material blending step can be carried out using the raw material blending unit 30. The grinding and separation step can be carried out using the vertical mill 50. The derivation step can be carried out using the derivation unit 60. The first sorting step can be carried out using the first sorting unit 10. Similar to the cement raw material manufacturing apparatus 100, a third sorting step using the third sorting unit 16 may be carried out in parallel with the second sorting step. The circulation step may be carried out by introducing the sorted raw material 15 obtained in the first sorting step into the raw material blending unit 30, or both the sorted raw material 15 and the sorted raw material 17 obtained in the third sorting step may be introduced into the raw material blending unit 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 ground by the vertical mill 50. Thus, each of the above steps can be carried out based on the description content in the cement raw material manufacturing apparatus 100. Therefore, the description content in the cement raw material manufacturing apparatus 100 is also applicable to the manufacturing method of cement raw materials in this embodiment.

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

[0046] The manufacturing method of cement clinker according to one embodiment has a firing step of introducing the cement raw material manufactured by the above-described manufacturing method into a kiln and firing it to obtain cement clinker. This manufacturing method may be carried out using the cement clinker manufacturing apparatus 200 shown in FIG. 1 above or a modified example thereof. Further, the firing step may be carried out using the firing apparatus 150 shown in FIG. 2 or a modified example thereof. Therefore, the description content of the cement clinker manufacturing apparatus 200 and the firing apparatus 150 is also applicable to the manufacturing method of the cement raw material of this embodiment.

[0047] In the above-described manufacturing method of cement clinker, since a cement raw material with a reduced metal content is used, wear of the equipment can be suppressed. Therefore, the load on the manufacturing equipment can be sufficiently reduced. Further, cement clinker with a sufficiently reduced metal content can be manufactured. Such cement clinker can be blended with gypsum or other raw materials to manufacture a cement composition with a sufficiently reduced metal content. Also, ferromagnetic and non-ferromagnetic metals can be recovered from waste with high precision, and recycled raw materials with high added value can be obtained.

[0048] A method for manufacturing a cement raw material intermediate according to an embodiment manufactures a cement raw material intermediate for obtaining a cement raw material using a raw material containing waste containing metal. The cement raw material intermediate is used for manufacturing a cement raw material to be introduced into a kiln, and may contain crushed materials of cement raw material original stones, as well as crushed materials of waste-derived components such as plastics, combustibles, magnetic metals, and non-magnetic metals derived from waste. The method for manufacturing the cement raw material intermediate may be performed using the sorting unit 10 in the cement raw material manufacturing apparatus 100 shown in FIG. 1 above.

[0049] When using the sorting unit 10, the second crushed material (rejected stones) obtained by the vertical mill 50 is used as a raw material for the method of manufacturing the cement raw material intermediate. The second crushed material contains magnetic metal and non-magnetic metal in addition to the cement raw material. This second crushed material is sorted into a cement raw material intermediate containing a cement raw material, a first metal-containing material having a higher content of magnetic metal than the cement raw material intermediate, and a second metal-containing material having a higher content of non-magnetic metal than the cement raw material intermediate and the first metal-containing material. By such a process, a cement intermediate with reduced contents of both magnetic metal and non-magnetic metal can be manufactured. By using the cement raw material intermediate obtained by this manufacturing method, a cement raw material, a cement clinker, and a cement composition with a sufficiently reduced metal content can be manufactured. Also, magnetic metal and non-magnetic metal can be recovered from waste with high precision and used as recycled raw materials with high added value.

[0050] As described above, the embodiments of the present invention have been explained, but the present invention is not limited to the above embodiments in any way.

Explanation of Reference Numerals

[0051] 10... Sorting section (first sorting section), 11... First metal inclusion, 12... Second metal inclusion, 15, 17... Sorting raw materials, 16... Sorting section (third sorting section), 20... Sorting section (second sorting section), 22... Belt conveyor, 24... Raw material, 30... Raw material blending section, 40... Feeding section, 41... Belt feeder, 45... Belt conveyor, 46... Bucket elevator, 50... Vertical mill, 51... Discharge pipe, 52... Discharge section, 60... Leading-out section, 62... Cyclone, 64... Bag filter, 80... Separation section, 100... Cement raw material manufacturing apparatus, 112... Calciner, 114... Rising duct, 122... Kiln end, 124... Burner, 126... Main body section, 140... Chlorine bypass, 142... Probe, 143... Cooling section, 145... Chamber, 146... Heat exchanger, 147... Dust collector, 148... Suction fan, 150... Firing apparatus, 151... Introduction section, 152... Kiln, 153... Clinker cooler, 200... Cement clinker manufacturing apparatus.

Claims

1. An apparatus for producing a cement raw material using a raw material containing waste material containing metal, 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 section 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 section for sorting the second pulverized material into a sorted raw material B containing non-metals and a metal-containing material containing magnetic metals by 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 apparatus for manufacturing a cement raw material according to claim 1, further comprising a separation section that separates a deposit containing the cement raw material that adheres to a metal piece contained in at least one of the first metal inclusion and the second metal inclusion from the metal piece to obtain a separated material containing the cement raw material.

3. The apparatus for producing a cement raw material according to claim 2 , wherein the separating section includes a vibrating feeder.

4. a second sorting unit that removes at least a portion of 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 apparatus for manufacturing a cement raw material according to claim 1, further comprising: a raw material blending section that blends the waste material having a reduced metal content with non-waste material to prepare the raw material.

5. 5. The apparatus for manufacturing a cement raw material 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 from the gas flow; 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 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 a metal-containing waste material, comprising: a crushing and separating step of crushing the raw material and separating the raw material 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 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 raw material A having a lower content of the metal than the second pulverized material, a first metal-containing material having a higher content of the magnetic metal than the sorted raw material A, and a second metal-containing material having a higher content of the non-magnetic metal than the sorted raw 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 by 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.

Images