A device and method for preparing a silico-aluminous cement

Abstract

The present application relates to solid waste recycling technical field, disclose a kind of silicon-aluminum cementing material preparation device and method, including pretreatment area, desulfurization gypsum storehouse, coarse powder storehouse, ball mill, fine powder storehouse, double-shaft forced mixer and finished product storehouse, each area is connected by conveyor belt and / or bucket elevator and is fed;Multifunctional air supply system is provided on the bucket elevator, and the multifunctional air supply system includes air supply structural member arranged at the bottom of the bucket elevator and air outlet located at the top of the bucket elevator;The bottom of the bucket elevator is also provided with a cleaning port, and the air supply structural member is located at the cleaning port, and can cover and close the cleaning port.To solve the problem that the elevator is easy to adhere, agglomerate and not easy to clean when transporting materials with high moisture content.

Description

Technical Field

[0001] This invention relates to the field of solid waste recycling technology, specifically to an apparatus and method for preparing aluminosilicate cementitious materials. Background Technology

[0002] Cementitious materials are the core basic materials for engineering construction. Ordinary silicate cement, as a traditional cementitious material, has problems such as high-temperature calcination, high carbon emissions, and large consumption of natural mineral resources in its production process. Moreover, its production raw materials are highly dependent on non-renewable resources such as limestone, which does not meet the current requirements for green and environmentally friendly development.

[0003] At the same time, the industrial production process generates a large amount of silicon-aluminum solid waste such as desulfurization gypsum, fly ash, carbide slag, and mineral powder, with a low disposal rate. The large amount of solid waste stockpiling not only occupies land resources, but also easily causes environmental problems such as dust and leachate pollution. The resource utilization of solid waste has become an important issue for the green development of industry.

[0004] In existing technologies, the preparation of cementitious materials using industrial solid waste includes: Step 1, pretreatment; Step 2, coarse material storage; Step 3, grinding; Step 4, fine material storage; and Step 5, batching. This process involves the conveying and ball milling of various raw materials, which presents the following problems: 1. Desulfurized gypsum has a high moisture content and requires pretreatment for dehydration. During the conveying process before drying, the high moisture content makes it extremely viscous, easily adhering and clumping in conveying equipment such as silos and bucket elevators, making it difficult to clean. 2. In actual production, to save equipment costs, a single elevator is used to lift and transport different materials. Although this is done in batches, residues inevitably remain at the bottom of the elevator. When a large amount of residue accumulates at the bottom, mixing problems easily occur, greatly affecting the accuracy of subsequent batching. Summary of the Invention

[0005] The present invention aims to provide an apparatus and method for preparing aluminosilicate cementitious materials, in order to solve the problem that the elevator is prone to adhesion, clumping and difficulty in cleaning when transporting raw materials with high moisture content.

[0006] To achieve the above objectives, the present invention provides a device for preparing aluminosilicate cementitious materials: including a pretreatment zone, a desulfurized gypsum silo, a coarse powder silo, a ball mill, a fine powder silo, a twin-shaft forced mixer, and a finished product silo. Each zone is connected and fed by a conveyor belt and / or a bucket elevator. The bucket elevator is equipped with a multi-functional air supply system, which includes an air supply structure at the bottom of the bucket elevator and an air outlet at the top of the bucket elevator. The bottom of the bucket elevator is also provided with a cleaning port, and the air supply structure is located at the cleaning port and can cover and close the cleaning port.

[0007] Preferably, as an improvement, the air supply structure includes a door panel, a fastener, a transfer box, and an air supply duct. One end of the door panel is rotatably connected to the housing, and the other end of the door panel has an extension. The fastener is located on the extension for locking and fixing the door panel. The transfer box is fixed to the door panel, and one side of the transfer box is connected to the air supply duct, on which an air pump is installed. The interior of the transfer box is connected to the interior of the housing through an inclined air guide duct, and the air guide duct is located on the door panel.

[0008] Preferably, as an improvement, an exhaust fan is installed on the air outlet duct, and a mesh or inclined air guide vane is installed at one end of the air guide duct near the inside of the casing.

[0009] Preferably, as an improvement, a storage hopper connected to its feed inlet is provided on one side of the bucket elevator, and a valve plate is provided inside the storage hopper; a sensor is provided near the feed inlet area, and when the hopper is transported to below the feed inlet, the PLC controller receives the signal from the sensor and controls the valve plate to open.

[0010] Preferably, as an improvement, a shroud is provided at the ball mill drive unit, through which the air duct is connected.

[0011] Preferably, as an improvement, the adapter box is also connected to a normal temperature air inlet pipe with a valve.

[0012] Preferably, as an improvement, an air guide plate is provided on the inner wall of the outer casing, and the air guide plate is located on the upper side of the outlet end of the air duct.

[0013] Preferably, as an improvement, the bucket elevator is also equipped with an auxiliary material rod on the bucket, and strip-shaped slots are provided on both sides of the bucket. A connecting column is slidably connected in the strip-shaped slot, and an elastic element is passed through the connecting column. The auxiliary material rod has a U-shaped structure, and the upper end of the auxiliary material rod is rotatably connected to the connecting column located below the limiting platform.

[0014] This technology also discloses a method for preparing aluminosilicate cementitious material, including the following steps: Step 1: Raw material pretreatment Step 2, grind separately After pretreatment, each raw material is metered by its own metering system and then fed into a ball mill for individual grinding. During the grinding process, 0.03%-0.05% grinding aid may be added. Step 3: Store separately After grinding, each raw material that meets the required fineness is sent to a dedicated storage bin corresponding to the fine powder bin for classified storage. Step 4, Ingredients for silica-alumina cementitious material: fly ash 30-47%; mineral powder 15-26%; ultrafine ash 5-12%; carbide slag 11-18%; desulfurized gypsum 6-8%; cement 4-15%; silica fume 0-4%; Step 5: Mix and stir All the metered raw materials are fed into a twin-shaft forced mixer via a closed conveyor and mixed.

[0015] Beneficial effects: 1. This cementitious material uses desulfurized gypsum, fly ash, ultrafine ash, mineral powder, and carbide slag as the main industrial solid waste raw materials, combined with a small amount of cement and silica powder. It is prepared through the synergistic effect of calcium-based alkali activation and sulfate activation, which maximizes the activation of multi-source siliceous aluminous solid waste, achieves a high solid waste content of more than 70%, and significantly reduces carbon emissions and production costs.

[0016] 2. This technology's bucket elevator is equipped with a multi-functional air supply system. When used for conveying coarse materials with high moisture content, the air pump can pump waste heat air from high-heat areas in the plant to the bucket elevator for waste heat utilization. The waste heat enters from the bottom and exits from the top, achieving a drying effect on the buckets, especially facilitating the shaking off of residual material to prevent sticking and reduce residue. Additionally, when the exhaust fan starts, the top air outlet can handle internal dust, and a normal-temperature air inlet pipe at the bottom of the casing allows some airflow to enter from the bottom, further facilitating dust collection and discharge. This technology can be used in multiple scenarios and has high applicability.

[0017] 3. The air supply duct is installed on the door panel of the cleaning port, which facilitates the cleaning of materials at the bottom of the machine casing and also facilitates the repair of structures such as the air guide duct and air pipe. The direction of the air guide duct can be set as needed. When it faces the bottom of the machine casing, it can assist in cleaning the bottom residue while drying.

[0018] 4. The auxiliary feeding rod can effectively shake the material out of the hopper, further preventing the accumulation of residual material inside. Furthermore, the auxiliary feeding rod is rotatable, and when it reaches the bottom, it can loosen the material. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the layout of each region in Embodiment 1 of the present invention.

[0020] Figure 2 This is a cross-sectional view of the bucket elevator in Example 1.

[0021] Figure 3 for Figure 2 A magnified view of part A in the image.

[0022] Figure 4 for Figure 2 A schematic diagram of a structure with air guide vanes installed in the central airflow duct.

[0023] Figure 5 This is a schematic diagram of the structure for installing a normal temperature air inlet duct in Example 2.

[0024] Figure 6 This is a schematic diagram of the air guide plate in Example 3.

[0025] Figure 7 This is a schematic diagram of the structure in Example 4, showing the air duct being positioned towards the discharge area of ​​the bucket elevator.

[0026] Figure 8 This is a perspective view of the hopper in Example 5.

[0027] The reference numerals in the accompanying drawings of the instruction manual include: housing 1, inlet 11, outlet 12, circulating conveyor chain 2, chain roller 3, hopper 4, auxiliary material rod 41, strip groove 42, connecting column 43, spring 44, limiting platform 45, storage hopper 5, valve plate 51, sensor 52, air supply structure 6, door panel 61, air guide duct 611, air guide plate 6112, mesh 6113, air guide plate 6114, fastener 62, adapter box 63, normal temperature air inlet pipe 631, air supply pipe 64, fastening plate 65, air outlet duct 7, and fan cover 8. Detailed Implementation

[0028] Example 1 As attached Figure 1 , Figure 2 , Figure 3 As shown, an apparatus for preparing a silica-alumina cementitious material includes a pretreatment zone, a desulfurized gypsum silo, a coarse powder silo, a ball mill, a fine powder silo, a twin-shaft forced mixer, and a finished product silo. A gypsum conveyor belt is installed between the desulfurized gypsum silo and the ball mill, and a coarse powder conveyor belt is installed between the coarse powder silo and the ball mill. A bucket elevator is installed at the feed end of the ball mill to convey the raw materials on the gypsum / coarse powder conveyor belt into the ball mill. A bucket elevator is also installed at the discharge end of the ball mill to lift and convey the ball-milled raw materials to the fine powder silo. A closed conveyor is installed below the fine powder silo; in this embodiment, it is specifically a closed belt conveyor. A bucket elevator is installed at the discharge end of the fine powder conveyor belt to feed the metered raw materials into the twin-shaft forced mixer.

[0029] The coarse material silos include fly ash silos, mineral powder silos, and carbide slag silos; the fine material silos include desulfurized gypsum fine material silos, fly ash fine material silos, mineral powder fine material silos, cement silos, silica fume silos, and ultrafine ash silos. Each silo has a valve at its bottom discharge port. This technology can be used to produce multi-grade silica-alumina cementitious materials synergistically blended with multiple solid wastes. These cementitious materials use desulfurized gypsum, fly ash, ultrafine ash, mineral powder, and carbide slag as the main industrial solid waste raw materials, combined with a small amount of cement and silica fume, and are prepared through the synergistic effect of calcium-based alkali activation and sulfate activation. A pretreatment area is set up before the desulfurized gypsum silo, and a bucket elevator is installed in the pretreatment area to connect the various processes.

[0030] The bucket elevator includes a casing 1 and a circulating conveyor chain 2 located inside the casing 1. Chain rollers 3 are installed at both the upper and lower parts of the casing 1, and gears are installed at the chain rollers 3 to mesh with the circulating conveyor chain 2. A drive motor is connected to the main chain roller 3 to drive the chain roller 3 to rotate, thereby driving the circulating conveyor chain 2. Buckets 4 are installed on the circulating conveyor chain 2. A feed inlet 11 is located on the lower left side of the casing 1, and a discharge outlet 12 is located on the upper right side of the casing 1. A storage hopper 5 is located on one side of the casing 1, communicating with the feed inlet 11. A valve plate 51 is installed inside the storage hopper 5, and a rotating shaft is located in the middle of the valve plate 51, rotatably connected to the wall of the storage hopper 5. A motor is connected to the rotating shaft, and the motor drives the valve plate 51 to rotate, thereby achieving feeding. A sensor 52 (e.g., an infrared sensor 52 or a Hall sensor 52) is installed near the feed inlet 11 on the casing 1. In this embodiment, it is specifically installed on the inner side of the casing 1, not on the same side as the feed inlet 11, but offset from it on an adjacent side. When the hopper 4 is transported to below the feed inlet 11, the sensor 52 senses the hopper 4. The PLC controller receives the signal from the sensor 52 and controls the valve plate 51 to open for a preset time, allowing the raw material in the storage hopper 5 to slide into the hopper 4. The preset time is pre-calibrated based on the raw material and the size of the hopper. Through intelligent linkage, the feeding is precisely controlled. Fixed supports are provided on both the storage hopper 5 and the bottom of the casing to improve stability and support strength.

[0031] The housing 1 is also equipped with a multi-functional air supply system, which includes an air supply structure 6 located at the bottom of the housing 1 and an air outlet duct 7 located at the top of the housing 1. The air supply structure 6 includes a door panel 61, a locking element 62, an adapter box 63, and an air supply pipe 64. A cleaning port is provided at the bottom of the housing 1. One end of the door panel 61 is rotatably connected to the housing 1, and the other end of the door panel 61 has an extension. A threaded latch plate 65 is welded to the bottom of the extension on the housing 1. The locking element 62 passes through the extension and is fixed to the latch plate 65, thereby fixing the door panel 61. In this embodiment, the locking element 62 is a bolt. The inner side of the door panel 61 protrudes into the cleaning port and is flush with the inner wall of the housing 1. In other embodiments besides this one, a sealing ring is provided on the inner side of the door panel 61 to further ensure the sealing performance of the door panel 61 when closed.

[0032] The adapter box 63 is welded and fixed to the door panel 61. One side of the adapter box 63 is connected to the air supply pipe 64, and an air pump is installed on the air supply pipe 64. The interior of the adapter box 63 is connected to the interior of the housing 1 through an inclined guide air duct 611, which is located on the door panel 61. The housing 1 is also equipped with a pressure relief valve. In other embodiments besides this one, an exhaust fan can also be installed on the air outlet duct 7 to enhance the airflow and form a preset flow path. In other embodiments besides this one, a mesh 6113 is provided at one end of the guide air duct 611 near the interior of the housing 1 to prevent large particles from entering the air duct; or as... Figure 4As shown, an inclined air guide vane 6112 is provided at one end of the air guide duct 611 near the inside of the housing 1. This not only prevents large particles from rolling into the air duct, but also guides the airflow towards the bottom of the housing 1. The air guide duct 611 is arranged in a long strip along the bottom of the housing 1 to cover the bottom thickness direction as much as possible.

[0033] A fan hood 8 is installed at each motor location in the factory, and the air duct 64 is connected to the fan hood 8 to realize waste heat utilization. For example, a fan hood 8 is installed at the ball mill motor. The fan hood 8 can be a trumpet-shaped structure or a box structure. When it is a box structure, at least one side wall of the box is a mesh structure. The heat from the ball mill is sent into the casing 1 by the exhaust fan to realize waste heat utilization. Especially when the elevator is used to transport raw materials with high moisture content, the heat can circulate in the casing 1 to dry the raw materials. In particular, after the material in the hopper 4 is tilted, the remaining sticky material inside is dried, which makes it easier for the material to shake and fall when the hopper 4 moves downward.

[0034] Example 2 The difference between this embodiment and Embodiment 1 is that, as Figure 5 As shown, the adapter box 63 is also connected to a normal temperature air inlet pipe 631 with a valve, which connects to the outside. This allows the bucket elevator to have a new usage mode. When the transported product generates a lot of dust and hot air is not required, the air supply pipe 64 can be closed in advance and the normal temperature air inlet pipe 631 can be opened. The exhaust fan starts, and the air outlet 7 at the top can handle the internal dust. Moreover, the normal temperature air inlet pipe 631 at the bottom of the casing 1 allows some airflow to enter from the bottom, which is more conducive to the collection and discharge of dust.

[0035] Example 3 The difference between this embodiment and Embodiment 2 is that, as Figure 6 As shown, an air guide plate 6114 is provided on the inner wall of the outer casing. The air guide plate 6114 is located on the upper side of the outlet end of the air guide duct 611, which further realizes the purpose of blowing air to the bottom of the casing 1 and reducing the deposition of raw materials at the bottom.

[0036] Example 4 The difference between this embodiment and Embodiment 1 is that, as Figure 7 As shown, the air guide duct 611 is arranged towards the discharge area of ​​the bucket elevator to enhance the air heating effect on the empty hopper 4. In other embodiments besides this one, two air guide ducts 611 can also be provided, one to send air towards the bottom of the casing 1 and the other to send air towards the discharge port 12 of the casing 1.

[0037] Example 5 The difference between this embodiment and embodiments 1 or 4 is that, as Figure 8As shown, the hopper 4 is also equipped with an auxiliary material rod 41. Strip-shaped slots 42 are provided on both side walls of the hopper 4, and connecting columns 43 are slidably connected within these slots. A spring 44 passes through the connecting column 43. The top of the connecting column 43 is a large end, and a limiting platform 45 is provided within the strip-shaped slot 42. The spring 44 is located between the large end and the limiting platform 45. The auxiliary material rod 41 has a U-shaped structure, and its upper end is rotatably connected to the connecting column 43 located below the limiting platform 45. In use, when raw materials enter the hopper 4, they press the auxiliary material rod 41 downwards. When the raw materials are ejected, the auxiliary material rod 41 can shake off any remaining material in the hopper 4. When the hopper 4 is transported to the other side and flipped downwards, the auxiliary material rod 41 will flip downwards out of the hopper 4 under its own weight, further shaking off any remaining material in the hopper 4. When the auxiliary material rod 41 falls to the bottom, it can loosen the material at the bottom of the machine casing 1.

[0038] Example 6 A method for preparing a silica-alumina cementitious material includes the following steps: Step 1: Raw material pretreatment Desulfurized gypsum: aged for ≥3 months, moisture content controlled ≤2%, remove stones and hardened impurities; Carbide slag: Dry to a moisture content of ≤1.5%, crush to a particle size of ≤5mm, remove hard lumps and impurities, and store separately to prevent moisture; Fly ash, ultrafine ash, mineral powder, and silica fume: ensure no caking, moisture content ≤1%, silica fume should be stored separately in a sealed, moisture-proof container; Cement: P・O42.5 ordinary Portland cement is used. After passing the incoming inspection, it is stored separately to avoid moisture absorption when stored with solid waste. During the above pretreatment process, the bucket elevator used in Examples 1-3 can be used for feeding. For example, to control costs, the purchased desulfurized gypsum has a moisture content of less than 15%. Using the bucket elevator in Examples 1-3 during aging can reduce residual material adhesion. The pretreated raw materials are then fed into the coarse powder silo and the desulfurized gypsum silo.

[0039] Step 2, grind separately After pretreatment, each raw material is metered by its own metering system and then fed into a ball mill for individual grinding. During the grinding process, 0.03%-0.05% grinding aid can be added to ensure grinding efficiency.

[0040] Step 3: Store separately After grinding, the raw materials that meet the required fineness are sent to the corresponding special storage bins for classified storage. Cement and silica powder are stored in sealed bins to prevent moisture and clumping.

[0041] Step 4: Precise ingredient mixing Based on the target raw material formula, precise parameters are input into the automated batching control system. High-precision electronic scales are used to independently measure various raw materials. Trace amounts of raw materials are accompanied by high-precision micro-scale scales, ensuring a batching measurement error of ≤±0.5%. After measurement, the conveying equipment automatically stops. The measuring equipment is calibrated and maintained periodically. Silica-alumina cementitious material batching: fly ash 30-47%; mineral powder 15-26%; ultrafine ash 5-12%; calcium carbide slag 11-18%; desulfurized gypsum 6-8%; cement 4-15%; silica fume 0-4%. Specific raw material proportions are as follows: SC22.5 low grade: fly ash 47%, mineral powder 15%, ultrafine ash 8%, carbide slag 18%, desulfurized gypsum 8%, cement 4%; SC32.5 standard: fly ash 40%, mineral powder 20%, ultrafine ash 8%, carbide slag 14%, desulfurized gypsum 7%, cement 9%, silica fume 2%; SC42.5 High Grade: 30% fly ash, 26% mineral powder, 8% ultrafine ash, 11% carbide slag, 6% desulfurized gypsum, 15% cement, and 4% silica fume.

[0042] Step 5: Mix and stir All the metered raw materials are fed into a twin-shaft forced mixer via a closed conveyor and mixed at a set speed for 120-180 seconds to ensure that the materials are evenly distributed at the microscopic level.

[0043] Step 6: Finished Product Storage and Homogenization The mixed material is sent into the finished product silo, which is equipped with a partitioned air-filling unloading device at the bottom to ensure uniform product composition and avoid performance fluctuations.

[0044] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An apparatus for preparing aluminosilicate cementitious material, characterized in that: It includes a pretreatment area, a desulfurized gypsum silo, a coarse powder silo, a ball mill, a fine powder silo, a twin-shaft forced mixer, and a finished product silo. Each area is connected and fed by a conveyor belt and / or a bucket elevator. The bucket elevator is equipped with a multi-functional air supply system, which includes an air supply structure at the bottom of the bucket elevator and an air outlet at the top of the bucket elevator. The bottom of the bucket elevator is also equipped with a cleaning port, and the air supply structure is located at the cleaning port and can cover and close the cleaning port.

2. The apparatus for preparing aluminosilicate cementitious material according to claim 1, characterized in that: The air supply structure includes a door panel, a locking fastener, a transfer box, and an air supply duct. One end of the door panel is rotatably connected to the housing, and the other end of the door panel has an extension. The locking fastener is located on the extension and is used to lock and fix the door panel. The transfer box is fixed to the door panel, and one side of the transfer box is connected to the air supply duct. An air pump is installed on the air supply duct. The interior of the transfer box is connected to the interior of the housing through an inclined air guide duct, and the air guide duct is located on the door panel.

3. The apparatus for preparing aluminosilicate cementitious material according to claim 2, characterized in that: An exhaust fan is installed on the air outlet duct, and a mesh or inclined air guide vane is installed at one end of the air duct near the inside of the casing.

4. The apparatus for preparing aluminosilicate cementitious material according to claim 3, characterized in that: A storage hopper connected to its feed inlet is installed on one side of the bucket elevator, and a valve plate is installed inside the storage hopper; a sensor is installed near the feed inlet area. When the hopper is transported to below the feed inlet, the PLC controller receives the signal from the sensor and controls the valve plate to open.

5. The apparatus for preparing aluminosilicate cementitious material according to claim 4, characterized in that: A hood is installed at the drive unit of the ball mill, and the air duct is connected to the hood.

6. The apparatus for preparing aluminosilicate cementitious material according to claim 5, characterized in that: The junction box is also connected to a normal temperature air inlet pipe with a valve.

7. The apparatus for preparing aluminosilicate cementitious material according to claim 6, characterized in that: An air guide plate is provided on the inner wall of the outer casing, and the air guide plate is located on the upper side of the outlet end of the air duct.

8. The apparatus for preparing aluminosilicate cementitious material according to claim 7, characterized in that: The bucket elevator is also equipped with an auxiliary material rod on the bucket. The two side walls of the bucket are provided with strip-shaped slots, and a connecting column is slidably connected in the strip-shaped slots. An elastic element is installed on the connecting column. The auxiliary material rod has a U-shaped structure, and the upper end of the auxiliary material rod is rotatably connected to the connecting column located below the limiting platform.

9. A method for preparing a silica-alumina cementitious material, characterized in that, Includes the following steps: Step 1: Raw material pretreatment Step 2, grind separately After pretreatment, each raw material is metered by its own metering system and then fed into a ball mill for individual grinding. During the grinding process, 0.03%-0.05% grinding aid may be added. Step 3: Store separately After grinding, each raw material that meets the required fineness is sent to a dedicated storage bin corresponding to the fine powder bin for classified storage. Step 4, Ingredients for silica-alumina cementitious material: fly ash 30-47%; mineral powder 15-26%; ultrafine ash 5-12%; carbide slag 11-18%; desulfurized gypsum 6-8%; cement 4-15%; silica fume 0-4%; Step 5: Mix and stir All the metered raw materials are fed into a twin-shaft forced mixer via a closed conveyor and mixed.

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