Manufacturing apparatus for hydraulic cement composition

Abstract

To make it possible to continuously produce a hydraulic cement composition, employing an acidic material and a basic material as raw materials, wherein CO2 released from energy necessary in manufacturing and CO2 discharged from the raw materials are reduced.SOLUTION: A manufacturing apparatus 10 for a hydraulic cement composition uses, as raw materials, an acidic material containing blast-furnace slag or electric-furnace slag which is an acidic steelmaking slag, and a basic material containing converter slag which is a basic steelmaking slag or limestone which is a basic material, and has an apparatus A that continuously produces a molten mixture 12 by mixing raw materials in which at least one of the acidic material and the basic material is a slag in a molten state, and an apparatus B that produces a clinker 52 by continuously rapid-cooling the molten mixture 12 obtained from the apparatus A.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an apparatus for producing a hydraulic cement composition. [Background technology]

[0002] Japan's crude steel production volume in 2020 was 83 million tons, of which 62 million tons was produced using the blast furnace method. Assuming that carbon dioxide (CO2) emissions associated with the production of 1 ton of crude steel using the blast furnace method are 2.0 tons, the CO2 emissions from the production of 62 million tons of crude steel would be 124 million tons. This corresponds to 10% of the country's total CO2 emissions, approximately 1.2 billion tons. At the same time, as by-products of crude steel production using the blast furnace method, 20 million tons of blast furnace slag and 9.5 million tons of converter slag were generated in 2020. Various efforts are underway to address these burdens, including the shift from the blast furnace method to the electric furnace method and the development of steelmaking methods with less CO2 emissions. Various efforts are also underway to utilize blast furnace slag and converter slag.

[0003] Blast furnace slag is almost entirely used as a cement raw material, cement admixture, road material, etc. However, it cannot be said that the added value of any of these is sufficiently high, and there is a demand for technologies to utilize it in ways that offer even greater value. There have been attempts to use converter slag in a variety of ways, such as as road material, civil engineering material, fertilizer, and seaweed bed formation material, but compared to blast furnace slag, its development into established uses is limited. There is a demand for technologies to utilize both blast furnace slag and converter slag in ways that offer even greater added value than the current situation.

[0004] Meanwhile, Japan's cement production volume in 2020 was 56 million tons, and assuming CO2 emissions per ton of cement are 0.75 tons, this means that 42 million tons of CO2 were emitted. This is equivalent to approximately 3.5% of the country's total CO2 emissions and roughly one-third of the emissions from steel production, which is a considerable amount of CO2. As a result, various efforts are being made to reduce CO2 emissions associated with cement production.

[0005] Regarding CO2 reduction during cement production, there remains untapped technology for utilizing blast furnace slag and converter slag. Because both blast furnace slag and converter slag are produced in a molten state, if cement compositions could be produced from the molten state, the energy required for current cement production, which involves heating raw materials to 1450°C using a rotary kiln, would be almost unnecessary. Furthermore, because both blast furnace slag and converter slag are already decarbonated materials, there is a possibility that CO2 emissions from the raw materials would be almost zero. In other words, there is the possibility of developing environmentally friendly cement that emits almost no CO2 from energy or raw materials.

[0006] As a technology related to the present invention, for example, in a method for producing hydraulic cement using electric furnace reduced slag produced in a steelmaking process using an electric furnace as an acidic material and quicklime as a basic material, molten electric furnace reduced slag and powdered quicklime are charged into an electric furnace and melted, and nitrogen gas is blown in and mixed to produce a molten mixture, which is then rapidly cooled and solidified to produce hydraulic cement (see Patent Document 1). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2000-313907 Summary of the Invention [Problem to be solved by the invention]

[0008] However, although the method described in Patent Document 1 is an example that shows that a hydraulic cement composition can be obtained using molten slag, it is a batch-type production method using an electric furnace, and has not yet been adapted for continuous, efficient production.

[0009] As mentioned above, conventional methods use molten slag as a raw material, but the production is carried out in a batch manner using an electric furnace, and it is thought that sufficient production efficiency cannot be achieved.

[0010] The present invention aims to enable the continuous production of a hydraulic cement composition using an acidic material and a basic material as raw materials, with reduced CO2 emitted from the energy required for production and reduced CO2 emitted from the raw materials. [Means for solving the problem]

[0011] The apparatus for producing a hydraulic cement composition according to a first aspect includes an apparatus A that continuously produces a molten mixture by mixing raw materials including an acidic material containing blast furnace slag or electric furnace slag, which is an acidic steel slag, and a basic material containing converter slag, which is a basic steel slag, or limestone, which is a basic material, and at least one of the acidic material and the basic material is molten slag; and an apparatus B that continuously quenches the molten mixture obtained from the apparatus A to produce clinker.

[0012] In a second aspect, the hydraulic cement composition manufacturing apparatus according to the first aspect further includes an apparatus C for continuously adding gypsum and a grinding aid to the clinker obtained from the apparatus B and grinding the clinker to continuously manufacture a cement composition.

[0013] In a third aspect, in the apparatus for producing a hydraulic cement composition according to the first or second aspect, the apparatus A is a steel cylinder with firebricks attached to its inner surface, openings at both axial ends, the axis of which is installed at a downward gradient of 1 to 6% from the horizontal toward the downstream side, and which is driven to rotate about its axis, and a heating burner is provided in at least the downstream opening.

[0014] In a fourth aspect, in the apparatus for producing a hydraulic cement composition according to any one of the first to third aspects, a hydraulic cement composition having an average density of 3.5 g / cm is provided in at least a part of the upstream side inside the apparatus A. 3 The above heat-resistant balls are provided.

[0015] In a fifth aspect, in the apparatus for producing a hydraulic cement composition according to the fourth aspect, a partition ring covered with firebricks is provided inside the apparatus A to limit the range of movement of the heat-resistant ball to a part of the upstream side inside the apparatus A.

[0016] In a sixth aspect, in the apparatus for producing a hydraulic cement composition according to any one of the first to fifth aspects, a plurality of protrusions or depressions covered with firebricks are provided on at least a part of the upstream side of the inner surface of the apparatus A.

[0017] In a seventh aspect, in the apparatus for producing a hydraulic cement composition according to any one of the first to sixth aspects, a nitrogen gas blowing part is provided inside the apparatus A.

[0018] In an eighth aspect, in the hydraulic cement composition manufacturing apparatus according to any one of the first to seventh aspects, an auxiliary device A1 is provided upstream of the device A to mix the raw materials prior to the device A.

[0019] In a ninth aspect, in the hydraulic cement composition manufacturing apparatus according to the eighth aspect, a component adjuster is supplied upstream of the auxiliary device A1.

[0020] In a tenth aspect, in the apparatus for producing a hydraulic cement composition according to the eighth aspect, the auxiliary device A1 is a continuous mixing device using a mechanical screw made of a heat-resistant material.

[0021] In an eleventh aspect, in the apparatus for manufacturing a hydraulic cement composition according to the ninth aspect, the auxiliary device A1 is provided with a gas jet generator that sprays a gas jet against the flowing state of the raw materials or the flowing state of the raw materials and the component adjuster.

[0022] In a twelfth aspect, in the apparatus for producing a hydraulic cement composition according to any one of the first to eleventh aspects, a device A2 is provided that supplies to the device A a powder that is at least one of a component adjuster powder that is either CaO, CaO and Al2O3, or CaO and SiO2, or a raw material powder that is iron and steel slag powder or limestone powder.

[0023] In a thirteenth aspect, in the apparatus for manufacturing a hydraulic cement composition according to the twelfth aspect, the device A2 has a storage mechanism for storing the powder, a mixing and supply mechanism for measuring and mixing the powder, and a preheating mechanism for heating the powder while utilizing waste heat from the device A and the device B.

[0024] In a fourteenth aspect, in the apparatus for producing a hydraulic cement composition according to the thirteenth aspect, the preheating mechanism is a continuous preheating device having one to five multistage cyclones.

[0025] In a fifteenth aspect, in the apparatus for producing a hydraulic cement composition according to the thirteenth aspect, the preheating mechanism is a continuous preheating device having a fluidized bed type heating mechanism.

[0026] In a sixteenth aspect, in the apparatus for producing a hydraulic cement composition according to any one of the first to fifteenth aspects, the apparatus B receives the granulated material of the molten mixture supplied from the apparatus A on a movable mesh panel, and while the granulated material is moving, blows air onto the granulated material from a plurality of points below the mesh panel to rapidly cool the granulated material and continuously produce clinker.

[0027] In a seventeenth aspect, in the apparatus for manufacturing a hydraulic cement composition according to any one of the first to fifteenth aspects, the apparatus B is configured to have a lower movable mesh that receives the granulated molten mixture from the apparatus A, and an upper movable mesh provided above the lower movable mesh, and air is blown onto the granulated material from a plurality of points below the lower movable mesh to rapidly cool the granulated material and produce clinker.

[0028] In an eighteenth aspect, in the apparatus for producing a hydraulic cement composition according to the sixteenth or seventeenth aspect, the air used in the device B is an air jet or a low-temperature air jet using cooled air.

[0029] In a nineteenth aspect, in the apparatus for producing a hydraulic cement composition according to any one of the first to eighteenth aspects, a slow-cooling zone is provided at the downstream end of the device A.

[0030] In a twentieth aspect, in the apparatus for manufacturing a hydraulic cement composition according to any one of the first to nineteenth aspects, a steel cylinder B1 is provided between the apparatus A and the apparatus B, and a blower for blowing air into the steel cylinder B1 is provided at an outlet portion on the downstream side of the steel cylinder B1.

[0031] In a 21st aspect, in the apparatus for producing a hydraulic cement composition according to any one of the first to 20th aspects, the apparatus B sprays a flux of air jets onto the molten mixture in a flowing state supplied from the apparatus A, granulating the molten mixture and simultaneously quenching it to continuously produce clinker.

[0032] In a 22nd aspect, in the apparatus for producing a hydraulic cement composition according to the 21st aspect, multiple stages of room temperature air jets using room temperature air, multiple stages of low temperature air jets using cooled air, or multiple stages of a combination of the room temperature air jets and the low temperature air jets are used as the air jets.

[0033] In a 23rd aspect, in the apparatus for producing a hydraulic cement composition according to the second aspect, the apparatus C is a ball mill or a rod mill having a mechanism for adding gypsum and a grinding aid to the clinker supplied from the apparatus B, and continuously grinds the clinker.

[0034] In a 24th aspect, in the apparatus for producing a hydraulic cement composition according to the second aspect, the apparatus C has a mechanism for adding a grinding aid near at least the inlet side and a dispersant near the outlet side. [Effects of the Invention]

[0035] According to the present invention, a hydraulic cement composition can be continuously produced using an acidic material and a basic material as raw materials, with reduced CO2 emitted from the energy required for production and reduced CO2 emitted from the raw materials. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a block diagram showing an apparatus for producing a hydraulic cement composition according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing the device A. [Figure 3] 1 is an axial cross-sectional view showing a device A in which a heat-resistant ball and a partition ring are provided inside. [Figure 4] 1 is a radial cross-sectional view showing a device A having protrusions on its inner surface. [Figure 5] FIG. 2 is a radial cross-sectional view showing the device A provided with a nitrogen gas blowing section. [Figure 6] FIG. 2 is a cross-sectional view showing an auxiliary device A1 and a device A. [Figure 7] FIG. 2 is a cross-sectional view showing an auxiliary device A1 and a device A. [Figure 8] FIG. 2 is a cross-sectional view showing an auxiliary device A1. [Figure 9] FIG. 10 is a cross-sectional view showing a modified example of the auxiliary device A1. [Figure 10] FIG. 1 is a block diagram showing an apparatus for producing a hydraulic cement composition having an apparatus A2. [Figure 11] FIG. 10 is a front view schematically showing the device B. [Figure 12] FIG. 10 is a front view schematically showing a modified example of the device B. [Figure 13] 1 is a cross-sectional view showing device A, steel cylinder B1, and device B. [Figure 14] 1 is a cross-sectional view showing device A, a steel cylinder B1, and device B. FIG. [Figure 15] 1 is a cross-sectional view showing a modified example of the device A, a steel cylinder B1, and the device B. FIG. [Figure 16] FIG. 10 is a cross-sectional view showing the device C. DETAILED DESCRIPTION OF THE INVENTION

[0037] In the present disclosure, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the lower and upper limits.

[0038] In the numerical ranges described in stages in this disclosure, the upper or lower limit value described in one numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Furthermore, in the numerical ranges described in this disclosure, the upper or lower limit value of that numerical range may be replaced with a value shown in the examples.

[0039] In the drawings of this disclosure, components indicated by the same reference numerals are the same components. The dimensions in the drawings do not necessarily represent the actual dimensions, and may be enlarged or reduced as necessary.

[0040] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [First embodiment] 1 to 9, the hydraulic cement composition manufacturing apparatus 10 according to this embodiment includes an apparatus A and an apparatus B. The manufacturing apparatus 10 may further include an apparatus C.

[0041] [Device A] The apparatus A is an apparatus for continuously producing a molten mixture 12 (see FIG. 5, etc.) by mixing raw materials in which at least one of an acidic material and a basic material is molten slag. The acidic material includes blast furnace slag or electric furnace slag, which are acidic steel slag. The basic material includes converter slag, which is basic steel slag, or limestone, which is a basic material.

[0042] In FIG. 2, device A is, for example, a cylindrical body 14 made of steel, which is driven to rotate around its axis. The cylindrical body 14 is, for example, a cylinder, and firebricks 16 are attached to the inner surface of the cylindrical body 14. Openings (an upstream opening 14A and a downstream opening 14B) are provided at both ends of the axial direction of the cylindrical body 14. The cylindrical body 14 is installed, for example, so that its axis slopes downward from the horizontal direction by 1 to 6% toward the downstream side. At least the downstream opening 14B of device A is provided with a heating burner 18. An additional burner may be provided at the upstream opening 14A.

[0043] Basic refractory bricks, which have excellent heat resistance and mechanical properties, are desirable as the refractory bricks 16. Chromium-free refractory bricks such as magnesia spinel, magnesia calcium, and magnesia dolomite are suitable.

[0044] The raw materials are fed into the cylinder 14 (device A) from an opening 14A on the upstream side. A composition adjuster may also be fed into the cylinder 14A together with the raw materials. A molten mixture 12 is produced from the raw materials, or the raw materials and the composition adjuster, by the rotational mixing force of the cylinder 14 and heating by the burner 18. At the same time, the rotational force and gradient of the cylinder 14 gradually move the molten mixture 12 to the opening 14B on the downstream side and discharge it, thereby continuously producing the molten mixture 12.

[0045] As shown in FIG. 3, at least a part of the upstream side of the inside of the cylindrical body 14 is filled with a granular material having an average density of 3.5 g / cm 3 3 A plurality of the above heat-resistant balls 20 may be provided. The average density of the heat-resistant balls 20 is set as described above to prevent the heat-resistant balls 20 from floating in the molten mixture 12. Suitable metal materials for the heat-resistant balls 20 include mild steel, titanium, molybdenum, etc., and suitable ceramic materials include refractory brick materials such as magnesia-spinel, magnesia-calcium, and magnesia-dolomite. By combining a ceramic material and a metal material and using one as the surface layer and the other as the interior, it is possible to achieve a balance between heat resistance, mechanical properties, and density.

[0046] Furthermore, a partition ring 22 covered with refractory bricks 16 may be provided inside the cylindrical body 14 (device A) to limit the range of movement of the heat-resistant ball 20 to a part of the upstream side inside the device A. In this case, the position of the heat-resistant ball 20 is limited between the upstream end of the cylindrical body 14 and the partition ring 22.

[0047] The rotation of the cylindrical body 14 moves the heat-resistant balls 20, thereby enhancing the mixing power of the raw materials or the mixing action of the raw materials and the composition adjuster (powder). In particular, by limiting the range of movement of the heat-resistant balls 20 to a portion on the upstream side using the partition ring 22, the effect of enhancing the mixing action of the heat-resistant balls 20 to the raw materials, etc. can be further enhanced.

[0048] 4, a plurality of protrusions 24 or recesses (not shown) covered with refractory bricks 16 may be provided on at least a portion of the upstream side of the inner surface of the cylindrical body 14 (device A). These protrusions 24 or recesses can also enhance the mixing force of the raw materials or the mixing action of the raw materials and the composition adjuster (powder).

[0049] 5, a nitrogen gas blowing section 26 may be provided inside the cylindrical body 14 (apparatus A). The nitrogen gas blowing section 26 extends downward from the center of the cylindrical body 14, for example, and is capable of blowing nitrogen gas, which is an inert gas, into the inside of the molten mixture 12. This also makes it possible to enhance the mixing power of the raw materials or the mixing action of the raw materials and the composition adjuster (powder).

[0050] In Fig. 6, an auxiliary device A1 may be provided upstream of device A to mix the raw materials prior to device A. In this example, a raw material in the form of slag in which at least one of the acidic material and the basic material is in a molten state is supplied upstream of auxiliary device A1. Similar to device A, auxiliary device A1 may be a cylindrical body 30 having firebricks 28 attached to its inner surface and driven to rotate about its axis. The cylindrical body 30 is installed so that its axis has a downward slope of 1 to 6% toward the downstream side relative to the horizontal, for example.

[0051] The unmixed raw materials contain a mixture of acidic and basic materials, and it is desirable to balance the basicity and acidity of the refractory bricks 28. Therefore, it is desirable to use alumina-based or silica-based materials rather than magnesia-based materials for the refractory bricks 28.

[0052] The raw materials are fed into the cylinder 30 (auxiliary device A1) from the upstream opening 30A of the cylinder 30, and a molten mixture 12 is produced by the rotational mixing force of the cylinder 30. At the same time, the rotational force and gradient of the cylinder 30 gradually move the molten mixture 12 to the downstream opening 30B and discharge it.

[0053] The composition adjuster is supplied upstream of the auxiliary device A1, specifically between device A and auxiliary device A1. In other words, the molten mixture 12, which has been melt-mixed in advance in auxiliary device A1, has the composition adjuster added, and is then heated and mixed in cylinder 14 (device A). The molten mixture 12 can be produced more efficiently by mixing the raw materials in cylinder 30 (auxiliary device A1) prior to the cylinder 14 (device A) rather than melt-mixing the raw materials and composition adjuster only in cylinder 14 (device A). When producing the molten mixture 12, the liquid and powder are mixed, and a cement-producing reaction occurs.

[0054] As shown in Fig. 7, the raw materials and the composition adjuster may be supplied upstream of the auxiliary device A1. As shown in Fig. 8, the auxiliary device A1 may be a continuous mixer using a mechanical screw 32 made of a heat-resistant material. The mechanical screw 32 may be provided inside a non-rotating housing 34.

[0055] As shown in FIG. 9, auxiliary device A1 may be provided with a gas jet generator 36 that blows a gas jet against the flowing raw materials or the flowing raw materials and composition adjuster inside a housing 34. For example, nitrogen, an inert gas, can be used as the gas. A compressor 38 is connected to the gas jet generator 36. The gas is compressed by the compressor 38 and blown from the gas jet generator 36 toward the raw materials, etc. The resulting mixed molten mixture 12 is recovered in a recovery section 40, discharged from auxiliary device A1, and sent to device A.

[0056] 10, a device A2 may be provided to supply at least one of a composition adjuster powder, which is either CaO, CaO and Al2O3, or CaO and SiO2, or a raw material powder, which is steel slag powder or limestone powder, to the device A. The device A2 may include, for example, a storage mechanism 42 that stores at least one of the raw material powder and the composition adjuster powder, a mixing and supply mechanism 44 that measures and mixes the powder, and a preheating mechanism 46 that heats the powder while utilizing waste heat from the device A and the device B. Note that the term "powder" also includes granules.

[0057] The storage mechanism 42 has, for example, a raw material powder tank 42A and composition-adjusted powder tanks 42B, 42C, and 42D. The mixing and supply mechanism 44 is a lightweight mixer that measures and mixes each powder to a desired ratio. The preheating mechanism 46 may be a continuous preheating device having, for example, one to five multi-stage cyclones 46A. The multi-stage cyclone 46A is configured to receive waste heat from device A and device B. The multi-stage cyclone 46A may also be provided with a heating furnace 46B.

[0058] The preheating mechanism 46 may be a continuous preheating device having a fluidized bed type heating mechanism.

[0059] [Device B] 11, apparatus B is an apparatus that continuously quenches the molten mixture 12 obtained from apparatus A to produce clinker 52. As an example, apparatus B is an apparatus that receives granulated material 50 of the molten mixture 12 supplied from apparatus A on a movable mesh panel 48, and quenches the granulated material 50 by blowing air onto the granulated material 50 from multiple points below the mesh panel while the granulated material 50 is moving, thereby continuously producing clinker 52, such as an air quenching cooler.

[0060] As shown in Fig. 12, the apparatus B may be configured to include a lower movable mesh 54 that receives the granulated material 50 of the molten mixture 12 from the apparatus A, and an upper movable mesh 56 provided above the lower movable mesh 54. In this configuration, air compressed by a compressor 58 is blown onto the granulated material 50 from multiple points below the lower movable mesh 54 to rapidly cool the granulated material 50 and produce clinker 52. The upper movable mesh 56 prevents the granulated material 50 from separating from the lower movable mesh 54, allowing for efficient production of clinker 52.

[0061] In the examples shown in Figures 11 and 12, the air used in device B may be an air jet or a cold air jet using cooled air.

[0062] As shown in FIG. 13, a steel cylinder B1 may be provided between apparatus A and apparatus B, and a blower 60 for blowing air into the steel cylinder B1 may be provided at an outlet B1B on the downstream side of the steel cylinder B1. Refractory bricks 62 are attached to the inner surface of the steel cylinder B1. The molten mixture 12 discharged from apparatus A is supplied into the steel cylinder B1 from an opening B1A on the upstream side of the steel cylinder B1. The molten mixture 12 is slowly cooled by the blower 60, thereby increasing the viscosity of the molten mixture 12 and enabling the continuous production of granules 50. This is efficient because it is not necessary to perform slow cooling in apparatus A that produces the molten mixture 12.

[0063] Instead of the steel cylinder B1, a slow cooling zone may be provided at the downstream end of the device A. In this case, granules 50 of the molten mixture 12 produced in the device A can be supplied to the device B.

[0064] As shown in Fig. 14, the device B may be configured to blow an air jet flux onto the molten mixture 12 in a flowing state supplied from the device A, granulating the molten mixture 12 and simultaneously quenching it to continuously produce clinker 52. The air jet is compressed by a compressor 64 and blown onto the molten mixture 12 from an air jet generator 66. The clinker 52 formed in this way is recovered in a recovery section 68.

[0065] 15, multiple stages of room temperature air jets using room temperature air, multiple stages of low temperature air jets using cooled air, or multiple stages of a combination of room temperature air jets and low temperature air jets may be used. This enhances the quenching effect and enables efficient production of clinker 52 from the molten mixture 12.

[0066] [Device C] 1 and 16, apparatus C is an apparatus for continuously adding gypsum and a grinding aid to clinker 52 obtained from apparatus B and grinding the clinker 52 to continuously produce a cement composition. Apparatus C is a ball mill or a rod mill having a mechanism for adding gypsum and a grinding aid to clinker 52 supplied from apparatus B, and may be an apparatus for continuously grinding clinker 52.

[0067] As an example, the device C is a rotating steel cylinder, and a partition ring 72 is provided, for example, closer to the inlet 70A than the axial center. A large number of steel balls 74A are provided on the inlet 70A side of the partition ring 72. Furthermore, a large number of steel balls 74B, which are smaller than the steel balls 74A, are provided on the outlet 70B side of the partition ring 72. The clinker 52 is first roughly crushed by the steel balls 74A, and then finely crushed by the relatively small steel balls 74B to form cement.

[0068] Clinker 52 and gypsum are supplied to the device C from an inlet 70A. A grinding aid is supplied at least to the inlet 70A side of the partition ring 72. In addition, a dispersant may be supplied to the outlet 70B side of the partition ring 72. The dispersant is easily altered by the high temperature and impact force inside the device C, so it is added on the outlet side.

[0069] The partition ring 72 has the function of scooping up the cement that has been roughly crushed by the steel balls 74A and moving it to the side where the steel balls 74B are located. Near the outlet 70B inside the device C, a discharge mechanism 76 is provided to scoop up and discharge the finely crushed cement.

[0070] Gypsum is added to prevent the cement from hardening instantly when it comes into contact with water, ensuring sufficient fluidity for application. Grinding aids coat the surface of the crushed clinker 52 powder and inhibit the powder from agglomerating, thereby reducing the crushing time and energy required and improving the efficiency of crushing. Effective grinding aids include diethylene glycol, triethanolamine, and triisopropanolamine. As dispersants, polycarboxylic acid dispersants and lignin sulfonic acid dispersants are effective in improving the fluidity of cement.

[0071] As described above, according to this embodiment, a hydraulic cement composition can be continuously produced using an acidic material and a basic material as raw materials, with reduced CO2 emitted from the energy required for production and reduced CO2 emitted from the raw materials. This makes it possible to provide an improved hydraulic cement composition production device.

[0072] [Other embodiments] The above describes one example of an embodiment of the present invention, but the embodiment of the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0073] 10 Hydraulic cement composition manufacturing apparatus 12 Molten mixture 14 Cylinder 14A Upstream opening 14B Downstream opening 16 Firebrick 18 Burner 20 Heat-resistant bowls 22 Divider ring 24 Protrusion 26 Nitrogen gas outlet 28 Firebrick 32 Mechanical screw 36 Gas Jet Generator 42 Storage Mechanism 44 Mixing feed mechanism 46 Preheating mechanism 46A Multi-stage Cyclone 48 mesh panels 50 Granulated materials 52 Clinker 54 Lower movable mesh 56 Upper moving mesh 60 Blower 70A entrance A device A1 Assistive Device A2 equipment B equipment B1 Steel cylinder C equipment

Claims

1. an apparatus A for continuously producing a molten mixture by mixing raw materials including an acidic material containing blast furnace slag or electric furnace slag, which is an acidic steel slag, and a basic material containing converter slag, which is a basic steel slag, or limestone, which is a basic material, wherein at least one of the acidic material and the basic material is molten slag; an apparatus B for continuously quenching the molten mixture obtained from the apparatus A to produce clinker; An apparatus for producing a hydraulic cement composition comprising:

2. 2. The apparatus for producing a hydraulic cement composition according to claim 1, further comprising an apparatus C for continuously adding gypsum and a grinding aid to the clinker obtained from the apparatus B and grinding the clinker to continuously produce a cement composition.

3. The device A is a steel cylinder having firebricks attached to its inner surface, openings at both ends in the axial direction, its axis being installed at a downward gradient of 1 to 6% toward the downstream side relative to the horizontal, and which is driven to rotate about its axis; 2. The apparatus for producing a hydraulic cement composition according to claim 1, wherein a heating burner is provided at least in the downstream opening.

4. The device A has an average density of 3.5 g / cm at least in a part on the upstream side thereof. ３ 2. The apparatus for producing a hydraulic cement composition according to claim 1, wherein the apparatus is provided with the above heat-resistant balls.

5. 5. The apparatus for producing a hydraulic cement composition according to claim 4, wherein a partition ring covered with a firebrick is provided inside the apparatus A to limit the range of movement of the heat-resistant ball to a portion of the upstream side inside the apparatus A.

6. 2. The apparatus for producing a hydraulic cement composition according to claim 1, wherein a plurality of protrusions or depressions covered with firebricks are provided on at least a portion of the upstream side of the inner surface of said apparatus A.

7. 2. The apparatus for producing a hydraulic cement composition according to claim 1, wherein the apparatus A is provided with a nitrogen gas blowing section inside.

8. 2. The apparatus for producing a hydraulic cement composition according to claim 1, further comprising an auxiliary device A1 provided upstream of said device A for mixing said raw materials prior to said device A.

9. 9. The apparatus for producing a hydraulic cement composition according to claim 8, wherein a component adjuster is supplied upstream of the auxiliary device A1.

10. 9. The hydraulic cement composition manufacturing apparatus according to claim 8, wherein the auxiliary device A1 is a continuous mixing device using a mechanical screw made of a heat-resistant material.

11. 10. The hydraulic cement composition manufacturing apparatus according to claim 9, wherein the auxiliary device A1 is provided with a gas jet generator that sprays a gas jet against the flowing down state of the raw materials or the flowing down state of the raw materials and the component adjuster.

12. CaO, CaO and Al ２ O ３ , or CaO and SiO ２ 2. The hydraulic cement composition manufacturing apparatus according to claim 1, further comprising a device A2 for supplying to the device A at least one powder selected from the group consisting of a component adjuster powder of any one of the above, and a raw material powder of iron and steel slag powder or limestone powder.

13. 13. The apparatus for manufacturing a hydraulic cement composition according to claim 12, wherein the apparatus A2 comprises a storage mechanism for storing the powder, a mixing and supply mechanism for metering and mixing the powder, and a preheating mechanism for heating the powder while utilizing waste heat from the apparatus A and the apparatus B.

14. 14. The apparatus for producing a hydraulic cement composition according to claim 13, wherein the preheating mechanism is a continuous preheating device having one to five multistage cyclones.

15. 14. The apparatus for producing a hydraulic cement composition according to claim 13, wherein the preheating mechanism is a continuous preheating device having a fluidized bed type heating mechanism.

16. 2. The apparatus for manufacturing a hydraulic cement composition according to claim 1, wherein the apparatus B receives the granulated material of the molten mixture supplied from the apparatus A on a movable mesh panel, and while the granulated material is moving, blows air onto the granulated material from a plurality of points below the mesh panel to rapidly cool the granulated material and continuously manufacture clinker.

17. 2. The apparatus for manufacturing a hydraulic cement composition according to claim 1, wherein the apparatus B is configured to include a lower movable mesh that receives the granulated molten mixture from the apparatus A, and an upper movable mesh that is provided above the lower movable mesh, and the apparatus B blows air onto the granulated mixture from a plurality of points below the lower movable mesh to rapidly cool the granulated mixture and produce clinker.

18. 18. The apparatus for producing a hydraulic cement composition according to claim 16 or 17, wherein the air used in the apparatus B is an air jet or a low-temperature air jet using cooled air.

19. 2. The apparatus for producing a hydraulic cement composition according to claim 1, wherein a slow cooling zone is provided at the downstream end of said apparatus A.

20. A steel cylinder B1 is provided between the device A and the device B, 2. The hydraulic cement composition manufacturing apparatus according to claim 1, wherein a blower for blowing air into the interior of said steel cylinder B1 is provided at an outlet portion on the downstream side of said steel cylinder B1.

21. 2. The apparatus for producing a hydraulic cement composition according to claim 1, wherein the apparatus B sprays a flux of air jets onto the molten mixture in a flowing state supplied from the apparatus A, thereby granulating the molten mixture and simultaneously quenching it to continuously produce clinker.

22. 22. The apparatus for manufacturing a hydraulic cement composition according to claim 21, wherein the air jets are a plurality of stages of room temperature air jets using room temperature air, a plurality of stages of low temperature air jets using cooled air, or a plurality of stages combining the room temperature air jets and the low temperature air jets.

23. 3. The apparatus for producing a hydraulic cement composition according to claim 2, wherein the apparatus C is a ball mill or a rod mill having a mechanism for adding gypsum and a grinding aid to the clinker supplied from the apparatus B, and continuously grinds the clinker.

24. 3. The apparatus for producing a hydraulic cement composition according to claim 2, further comprising a mechanism for adding a grinding aid near at least the inlet side of said device C and a dispersant near the outlet side thereof.

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