Ceramsite production line

Abstract

The ceramsite production line comprises a raw material storage device, a stirring machine, an extrusion pelletizer, a drying machine, a rotary kiln, a cooling machine and a screening machine which are sequentially connected, the raw material storage device comprises a batch hopper and a powder bin, the batch hopper is used for containing sludge, the powder bin is used for containing tailing slag, and the stirring machine is used for stirring the tailing slag. An aging room is connected between the stirrer and the extrusion pelletizer, a smoke treatment device is connected to a smoke outlet of the rotary kiln, and recovered heat of the smoke treatment device and the cooling machine is introduced into the drying machine, so that the technical problem that tailings and sludge cannot be perfectly treated in the prior art can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ceramsite production equipment, in particular to a ceramsite production line. Background Art

[0002] Ceramsite is widely used as an aggregate in the construction and building materials industry due to its advantages, including reasonable particle size distribution, low bulk density, low thermal conductivity, low water absorption, high refractoriness, good thermal insulation, and acid corrosion resistance. Sludge refers to a complex mixture of solid, semi-solid, and liquid waste produced during sewage treatment. New environmental protection policies require sludge to be stabilized, rendered harmless, and disposed of as a resource. As a byproduct of sewage treatment, the amount of sludge that needs to be treated has increased dramatically with the construction of sewage treatment plants. How to safely, effectively, and efficiently treat sludge to avoid secondary pollution has become an important research topic. The existing sludge treatment methods mainly include sanitary landfill, composting and incineration. Sanitary landfill occupies a lot of land, has great safety hazards and poses a great risk of secondary environmental pollution. Composting treatment requires reducing the moisture content of the sludge. Ways to reduce the moisture content include sludge drying and adding materials such as straw and sawdust. These measures reduce sludge treatment efficiency and increase sludge treatment costs. Incineration produces dust and toxic substances (such as dioxins), requires high investment intensity and high technical requirements.

[0003] Tailings are solid wastes discharged from metal or non-metal mines after ore sorting, including tailings and other industrial waste. Because they contain relatively little metal, tailings dams are often constructed by building dams along mountain slopes to block valley openings or enclosing land. A tailings dam collapse not only causes economic losses to the country but also endangers the lives and property of workers and residents downstream. The low recycling value of tailings has led to low public enthusiasm for environmental restoration around mines.

[0004] Tailings and sludge are two types of waste with relatively large output, which cause serious environmental pollution. There is currently no very complete disposal method for these two types of waste. Utility Model Content

[0005] In view of the various deficiencies of the existing technology, a ceramsite production line is proposed to solve the technical problem that the existing technology cannot fully treat tailings and sludge.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A ceramsite production line comprises a raw material storage device, a mixer, an extrusion granulator, a dryer, a rotary kiln, a cooler and a screening machine connected in sequence, wherein the raw material storage device comprises a batching hopper and a powder bin, the batching hopper is used to hold sludge, the powder bin is used to hold tailings, an aging room is connected between the mixer and the extrusion granulator, a flue gas treatment device is connected to the smoke outlet of the rotary kiln, and heat recovered from the flue gas treatment device and the cooler is passed into the dryer.

[0008] The technical solution is further configured such that the raw material storage device further includes a disperser, and the sludge is dispersed by the disperser and then fed into the batching hopper. The mixer is provided with a feed buffer hopper, and the feed buffer hopper is connected to the batching hopper.

[0009] The technical solution is further configured such that a first measuring scale is provided on the mixer, and the powder bin is connected to the first measuring scale.

[0010] The technical solution is further configured such that the mixer is further provided with a second weighing scale, the second weighing scale is connected to a waste bin, and the waste bin is used to hold powdered industrial waste.

[0011] The technical solution is further configured such that a third weighing scale is also provided on the mixer, and the third weighing scale is connected to an external water source.

[0012] The technical solution is further configured as follows: a metering and speed regulating device is provided between the extrusion granulator and the aging room, and a shaping machine is provided between the extrusion granulator and the drying machine.

[0013] The present technical solution is further configured such that the flue gas treatment device includes a desulfurization device, a quench cooler, a flue gas treatment induced draft fan and a desulfurization device connected in sequence, a dust collector is provided between the quench cooler and the desulfurization device and between the quench cooler and the flue gas treatment induced draft fan, the desulfurization device is connected to the clean air outlet, and the hot air outlet of the quench cooler is connected to the dryer.

[0014] The technical solution is further configured as follows: the mixer is a vertical turbulent mixer, the rotary kiln is a waterfall rotary kiln, the desulfurization device is an SNCR desulfurization device, the desulfurization device is a wet desulfurization device, and the dust collector is a bag dust collector.

[0015] The technical solution is further configured such that a hoist is provided between the cooler and the screening machine, and the screening machine is connected to different finished product storages.

[0016] The beneficial effects of the utility model are:

[0017] 1. Using sludge and tailings as raw materials for ceramsite production is widely available and inexpensive, thus achieving green, energy-saving, safe and efficient resource utilization of sludge and tailings.

[0018] 2. The mixture after being stirred by the mixer is sent to the aging room for aging to ensure that the moisture in the mixture has enough time to enter the interior from the surface and be evenly distributed; the mixture is dispersed and plasticized, and the organic matter forms organic colloid substances, which further increases the plasticity of the raw materials, improves the molding performance of the mixture and the performance of the finished product, ensures the stability of the material, and is beneficial to the subsequent process of ball drying.

[0019] 3. The heat source for drying mainly comes from two directions: one is the heat collected by cooling the ceramsite in the cooler; the other is the waste heat of the flue gas generated during the roasting process of the rotary kiln, which not only makes full use of the waste heat of the production line, but also saves the heat source supply of the drying section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a ceramsite production line in an embodiment of the present invention.

[0021] In the attached figure: 1. Blender; 2. Batching hopper; 3. Feed buffer hopper; 4. Powder silo; 5. First weighing scale; 6. Mixer; 7. Second weighing scale; 8. Waste bin; 9. Third weighing scale; 10. External water source; 11. Aging room; 12. Buffer hopper; 13. Measuring and speed regulating device; 14. Extrusion granulator; 15. Shaping machine; 16. Dryer; 17. Rotary kiln; 18. Cooler; 19. Elevator; 20. Screening machine; 21. De-pinning device; 22. First dust collector; 23. Quench cooler; 24. Second dust collector; 25. Flue gas treatment induced draft fan; 26. Desulfurization device; 27. Third dust collector; 28. Drying treatment induced draft fan; 29. ​​Water washing tower. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the following is a clear and complete description of the technical solution of the present invention in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application. In addition, the directional terms mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional terms used are used to illustrate rather than limit the invention.

[0023] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0024] According to the embodiment of the present invention, a ceramsite production line is provided. Figure 1, including a raw material storage device, a mixer 6, an extrusion granulator 14, a dryer 16, a rotary kiln 17, a cooler 18 and a screening machine 20 connected in sequence, the raw material storage device includes a batching hopper 2 and a powder bin 4, the batching hopper 2 is used to hold sludge, and the powder bin 4 is used to hold tailings. An aging room 11 is connected between the mixer 6 and the extrusion granulator 14, and a flue gas treatment device is connected to the smoke outlet of the rotary kiln 17. The recovered heat of the flue gas treatment device and the cooler 18 is passed into the dryer.

[0025] It should be noted that sludge can be red mud, river silt, municipal sludge, etc., with a moisture content of no more than 65%. Tailings can be fly ash, coal gangue, tailings (gold, iron, molybdenum, etc.), gasification slag, construction slag, etc., with a particle size no larger than 200 mesh and a moisture content no more than 3%. Using sludge and tailings as raw materials for ceramsite production is widely available and inexpensive, achieving green, energy-saving, safe, and efficient resource utilization of sludge and tailings.

[0026] In this embodiment of the ceramsite production line, please refer to Figure 1 The raw material storage device also includes a disperser 1. The sludge is dispersed by the disperser 1 and then fed into the batching hopper 2. A feed buffer hopper 3 is provided on the mixer 6. The feed buffer hopper 3 is connected to the batching hopper 2.

[0027] It should be noted that the sludge must be transported to the sludge storage workshop via dedicated conveying equipment for standby use. This process ensures sealed, slightly negative pressure conveying and prevents odor leakage. The sludge in the sludge storage workshop is dispersed by a disperser 1 and then fed into a batching hopper 2. The sludge is then metered and discharged from the batching hopper 2. The sludge is then transported by conveying equipment to the feed buffer hopper 3 on top of the mixer 6 for standby use.

[0028] In this embodiment of the ceramsite production line, please refer to Figure 1 The mixer 6 is provided with a first measuring scale 5 , and the powder bin 4 is connected to the first measuring scale 5 .

[0029] It should be noted that the tailings are transported to the factory via dedicated conveying equipment and pumped to the powder silo 4 for storage, ensuring sealed transportation throughout the entire process without dust leakage. The tailings in the powder silo 4 are fed to the first metering scale 5 via a sealed screw conveyor for controlled measurement.

[0030] In this embodiment of the ceramsite production line, please refer to Figure 1 The mixer 6 is also provided with a second weighing scale 7, which is connected to a waste bin 8 for storing powdered industrial waste. It should be noted that the powdered industrial waste in the waste bin 8 is fed into the second weighing scale 7 by a dedicated conveying device for metering.

[0031] In this embodiment of the ceramsite production line, please refer to Figure 1 The mixer 6 is also provided with a third measuring scale 9 , and the third measuring scale 9 is connected to an external water source 10 .

[0032] It should be noted that sludge, tailings, powdered industrial waste and water are fed into the mixer 6 for mixing according to the system control requirements. After high-speed stirring, the components in the material are fully mixed with water to ensure the homogeneity of the mixture. Preferably, the mixer 6 is a vertical turbulent flow mixer. The mixture after stirring by the mixer 6 is sent to the aging room 11 for aging to ensure that the water in the mixture has enough time to enter the interior from the surface and be evenly distributed; the mixture is dispersed and plasticized, and the organic matter forms an organic colloidal substance, which further increases the plasticity of the raw materials, can improve the molding performance of the mixture and the performance of the finished product, ensure the stability of the material, and is conducive to the ball drying in the later process.

[0033] In this embodiment of the ceramsite production line, please refer to Figure 1 A metering and speed regulating device 13 is provided between the extrusion granulator 14 and the aging room 11 , and a shaping machine 15 is provided between the extrusion granulator 14 and the dryer 16 .

[0034] It should be noted that the aged material is sent to the buffer hopper 12 for temporary storage, and then sent to the extrusion granulator 14 for granulation through the metering and speed regulating device 13 (differentiated granulation equipment is determined according to product market requirements). Preferably, the metering and speed regulating device 13 is the metering and speed regulating belt; the raw material balls after granulation enter the shaping machine 15 for shaping; the shaped raw material balls (whose moisture content is not higher than 20%) enter the dryer 16 for drying, and the dried material balls (whose moisture content is not higher than 2%) are sent to the rotary kiln 17 for roasting.

[0035] In this embodiment of the ceramsite production line, please refer to Figure 1 The flue gas treatment device includes a denitrification device 21, a quencher 23, a flue gas treatment induced draft fan 25 and a desulfurization device 26 connected in sequence. A dust collector is provided between the quencher 23 and the denitrification device 21 and between the quencher 23 and the flue gas treatment induced draft fan 25. The desulfurization device 26 is connected to the clean air outlet, and the hot air outlet of the quencher 23 is connected to the dryer 16.

[0036] It should be noted that in terms of flue gas emissions, the production line is equipped with comprehensive desulfurization, denitrification, and dust removal facilities based on different raw material and fuel composition combinations to meet ultra-low emission environmental protection standards. In treating dioxin-producing solid waste, the production line primarily uses a process combination of "low-temperature drying + high-temperature roasting + rapid quenching" to eliminate the generation and re-synthesis of dioxins. Specifically, the gas temperature entering the dryer 16 through the quencher 23 is 300°C, and the raw material balls are low-temperature dried at 200°C. After drying, the balls enter the rotary kiln 17 and are roasted at temperatures above 1100°C. The temperature at the rotary kiln exhaust port is 850°C, and the temperature at the hot air outlet of the quencher 23 is 320°C.

[0037] At the same time, the production line is equipped with a waste heat recycling pipeline. First, the quench cooler 23 extracts the flue gas heat generated during the roasting process of the rotary kiln and uses it for drying the raw balls, so that the drying section does not require an external heat source; second, the waste heat collected by the cooler 18 for cooling the expanded clay is also recovered. After heat balance calculation, in addition to drying the balls, it can also be used for workshop heating, bathing and other purposes, thus realizing the full and efficient utilization of the production line's thermal energy to the greatest extent.

[0038] Preferably, the rotary kiln 17 is a waterfall-type rotary kiln. Depending on practical circumstances, a secondary combustion chamber may be provided between the rotary kiln 17 and the desulfurization device 21. The desulfurization device 21 is an SNCR desulfurization device, and the desulfurization device 26 is a wet desulfurization device. The dust collectors include a first dust collector 22 and a second dust collector 24, both of which are bag filters. The flue gas temperature entering the second dust collector 24 is below 150°C, and the flue gas temperature entering the desulfurization device 26 is below 120°C. The exhaust gas from the dryer 16 passes through a third dust collector 27, a drying treatment induced draft fan 28, and a water scrubber 29 before meeting emission standards.

[0039] In this embodiment of the ceramsite production line, please refer to Figure 1 An elevator 19 is provided between the cooler 18 and the screening machine 20, and the screening machine 20 is connected to different finished product storages.

[0040] It should be noted that after being fully calcined and melted in the rotary kiln 17, the pellets fall into the cooler 18 for cooling. The gas temperature entering the dryer 16 from the cooler 18 is 320°C. The cooled ceramsite is then fed to the screening machine 20 via the elevator 19. The pellets are then sorted into different sizes based on market demand, packaged, and stored in different finished product warehouses. Furthermore, a dust removal mechanism can be installed at the screening machine 20 to remove dust from the formed ceramsite, preventing dust from being generated during screening and filtration.

[0041] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A ceramsite production line, characterized in that: It includes a raw material storage device, a mixer, an extrusion granulator, a dryer, a rotary kiln, a cooler and a screening machine connected in sequence. The raw material storage device includes a batching hopper and a powder bin. The batching hopper is used to hold sludge, and the powder bin is used to hold tailings. An aging room is connected between the mixer and the extrusion granulator. A flue gas treatment device is connected to the smoke outlet of the rotary kiln. The recovered heat of the flue gas treatment device and the cooler is introduced into the dryer.

2. The ceramsite production line according to claim 1, characterized in that The raw material storage device further comprises a disperser, and the sludge is dispersed by the disperser and then fed into the batching hopper. The mixer is provided with a feed buffer hopper, and the feed buffer hopper is connected to the batching hopper.

3. The ceramsite production line according to claim 1, characterized in that The mixer is provided with a first measuring scale, and the powder bin is connected to the first measuring scale.

4. The ceramsite production line according to claim 1, characterized in that The mixer is also provided with a second weighing scale, which is connected to a waste bin for storing powdered industrial waste.

5. The ceramsite production line according to any one of claims 1 to 4, characterized in that: The mixer is also provided with a third measuring scale, and the third measuring scale is connected to an external water source.

6. The ceramsite production line according to claim 1, characterized in that: A metering and speed regulating device is provided between the extrusion granulator and the aging room, and a shaping machine is provided between the extrusion granulator and the drying machine.

7. The ceramsite production line according to claim 1, characterized in that: The flue gas treatment device includes a desulfurization device, a quencher, a flue gas treatment induced draft fan and a desulfurization device connected in sequence. A dust collector is provided between the quencher and the desulfurization device and between the quencher and the flue gas treatment induced draft fan. The desulfurization device is connected to the clean air outlet, and the hot air outlet of the quencher is connected to the dryer.

8. The ceramsite production line according to claim 7, characterized in that: The mixer is a vertical turbulent mixer, the rotary kiln is a waterfall rotary kiln, the desulfurization device is an SNCR desulfurization device, the desulfurization device is a wet desulfurization device, and the dust collector is a bag dust collector.

9. The ceramsite production line according to claim 1, characterized in that: An elevator is provided between the cooler and the screening machine, and the screening machine is connected to different finished product storages.

Images