Alumina ash sintering system for corundum production

Abstract

The utility model discloses an aluminum ash sintering system for corundum production, and its technical scheme is: tail gas conveying pipe, sintering kiln one side is linked together with tail gas conveying pipe, the even heat plate is set up in the outside wall of tail gas conveying pipe, the heat collecting pipe is set up in the inside of tail gas conveying pipe, the heat collecting pipe is by pipe body and contact piece, the pipe body is helical, and the radial of helical is same with the radial of tail gas conveying pipe, the contact piece is helical, the contact piece sets up in the outside wall of pipe body, and the radial of contact piece is same with the radial of tail gas conveying pipe, the heat exchange pipe, tail gas conveying pipe sets up in the inside of heat exchange pipe, and heat exchange pipe is linked together with outside water circulation equipment, the utility model discloses when using, can be good to utilize the heat in tail gas.

Description

Technical Field

[0001] This utility model relates to the technical field of aluminum ash sintering equipment, and in particular to an aluminum ash sintering system for corundum production. Background Technology

[0002] Aluminum slag is a solid substance containing metallic aluminum and other components generated during the production, use, and recycling of electrolytic aluminum, cast aluminum, or other aluminum industries. Previously, aluminum slag was treated as waste and dumped, which not only wasted aluminum resources but also caused environmental problems. Therefore, finding economical and effective methods to utilize and manage aluminum slag will not only improve the economic efficiency of the aluminum industry and achieve effective resource recycling, but will also have a significant impact on achieving sustainable economic and social development.

[0003] The existing aluminum ash is usually sintered in a kiln during processing. Through high-temperature treatment, the aluminum ash is transformed into high-value corundum material. Aluminum ash replaces high-alumina bauxite raw materials, alleviates resource shortages, and reduces the production cost of corundum by more than 30%. Since its sintering temperature is usually between 1100-1300℃, a large amount of high-temperature exhaust gas is generated. However, the existing sintering equipment cannot make good use of the high-temperature exhaust gas, which leads to energy waste. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide an aluminum ash sintering system for corundum production, so as to solve the problem mentioned in the background art that existing sintering devices cannot make good use of high-temperature exhaust gas.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A sintering system for aluminum ash in corundum production includes a sintering kiln and further includes:

[0007] A tail gas conveying pipe is connected to one side of the sintering kiln.

[0008] A heat spreader plate is disposed on the outer wall of the exhaust gas delivery pipe;

[0009] A heat collection tube is disposed inside the exhaust gas conveying pipe. The heat collection tube consists of a tube body and a contact plate. The tube body is spiral-shaped, and the radial direction of the spiral is the same as the radial direction of the exhaust gas conveying pipe. The contact plate is spiral-shaped and disposed on the outer wall of the tube body. The radial direction of the contact plate is the same as the radial direction of the exhaust gas conveying pipe.

[0010] The heat exchange tube is provided inside the exhaust gas delivery pipe and is connected to an external water circulation device.

[0011] Optionally, the system also includes a scrubbing tower, with the exhaust gas delivery pipe connected to the scrubbing tower.

[0012] Optionally, a filter plate is fixedly installed inside the washing tower, and a water outlet pipe is fixedly installed below the filter plate. Multiple nozzles are fixedly installed below the water outlet pipe.

[0013] Optionally, a water collection tank is also provided at the bottom of the washing tower corresponding to the nozzle;

[0014] Optionally, it also includes an electrostatic precipitator tower, which is connected to the washing tower.

[0015] Optionally, the exhaust end of the electrostatic precipitator is provided with a first branch pipe and a second branch pipe.

[0016] Optionally, the first branch pipe is connected to the sintering kiln.

[0017] Optionally, it also includes an exhaust gas tower, with the second branch pipe connected to the exhaust gas tower.

[0018] Optionally, both the first branch pipe and the second branch pipe are equipped with valves.

[0019] Optionally, the exhaust gas delivery pipe, the pipe body, and the contact piece are all made of copper.

[0020] In summary, the present invention has the following beneficial effects: A heat collection tube is installed inside the exhaust gas delivery pipe. The heat collection tube is spiral-shaped with contact plates on its outer side to increase the contact surface with the exhaust gas. Cold water flows through the tube. When the high-temperature exhaust gas contacts the heat collection tube, the heat is transferred to the cold water, heating it and ensuring full utilization of the heat in the exhaust gas. Furthermore, a heat spreader is installed on the outer wall of the exhaust gas delivery pipe, which is located inside the heat exchange tube. After the high-temperature exhaust gas enters the exhaust gas delivery pipe, some of its heat is transferred to the tube and then to the cold water between the exhaust gas delivery pipe and the heat exchange tube, further enhancing the utilization of the exhaust gas. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a schematic diagram of the structure of the air pipe connection device in an embodiment of this utility model.

[0024] Reference numerals in the attached drawings: 1. Sintering kiln; 2. Tail gas conveying pipe; 3. Heat soaking plate; 4. Heat collecting pipe; 401. Pipe body; 402. Contact plate; 5. Heat exchange pipe; 6. Scrubbing tower; 7. Filter plate; 8. Water outlet pipe; 9. Nozzle; 10. Water collection tank; 11. Electrostatic dust removal tower; 12. First branch pipe; 13. Second branch pipe; 14. Tail gas emission tower. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0026] In the description of this utility model, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments; furthermore, all embodiments may be used in combination with each other.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] This utility model provides an aluminum ash sintering system for corundum production, including a sintering kiln 1, and further comprising: a tail gas conveying pipe 2, one side of the sintering kiln 1 being connected to the tail gas conveying pipe 2; a heat spreader plate 3, the heat spreader plate 3 being disposed on the outer wall of the tail gas conveying pipe 2; a heat collector pipe 4, the heat collector pipe 4 being disposed inside the tail gas conveying pipe 2, the heat collector pipe 4 being composed of a pipe body 401 and a contact piece 402, the pipe body 401 being spiral-shaped, and the radial direction of the spiral being the same as the radial direction of the tail gas conveying pipe 2, the contact piece 402 being spiral-shaped, the contact piece being disposed on the outer wall of the pipe body 401, and the radial direction of the contact piece 402 being the same as the radial direction of the tail gas conveying pipe 2; and a heat exchange pipe 5, the tail gas conveying pipe 2 being disposed inside the heat exchange pipe 5, the heat exchange pipe 5 being connected to an external water circulation device.

[0031] In this invention, a heat collection pipe 4 is installed inside the exhaust gas delivery pipe 2. The pipe body 401 is spiral-shaped, and contact plates are installed on the outside of the pipe body 401 to increase the contact surface with the exhaust gas. Cold water flows through the pipe body. When the high-temperature exhaust gas enters the exhaust gas delivery pipe 2 and contacts the heat collection pipe 4, the heat is conducted to the cold water inside the pipe to heat the cold water, so that the heat in the exhaust gas can be fully utilized. In addition, a heat spreader 3 is also provided on the outer wall of the exhaust gas delivery pipe 2. The exhaust gas delivery pipe 2 is located inside the heat exchange pipe 5. After the high-temperature exhaust gas enters the exhaust gas delivery pipe, some of the heat is conducted to the exhaust gas delivery pipe 2, and then to the cold water between the exhaust gas delivery pipe 2 and the heat exchange pipe 5, further improving the utilization of the exhaust gas. The exhaust gas delivery pipe 2 and the heat collection pipe 4 can heat the cold water of the external water-using equipment, making full use of the heat in the exhaust gas and preventing heat loss and waste.

[0032] Aluminum ash is sintered in sintering kiln 1. Auxiliary materials such as coke (reducing agent), iron filings (to promote the reduction and separation of impurities), and limestone (for solidifying fluorine) are added and mixed with aluminum ash in a certain proportion (aluminum ash: coke: iron filings ≈ 100:34:813 (smelting method)). Through high-temperature treatment (usually at 1100-1300℃), aluminum ash is transformed into high-value-added corundum material. Aluminum ash replaces high-alumina bauxite raw material, alleviating resource shortages and reducing corundum production costs by more than 30%.

[0033] In one embodiment of this utility model, a scrubbing tower 6 is also included. The exhaust gas conveying pipe 2 is connected to the scrubbing tower 6. A filter plate 7 is fixedly installed inside the scrubbing tower 6. A water outlet pipe 8 is fixedly installed below the filter plate 7 in the scrubbing tower 6. A plurality of nozzles 9 are fixedly installed below the water outlet pipe 8. A water collection tank 10 is also provided at the bottom of the scrubbing tower 6 corresponding to the nozzles 9.

[0034] Through the above technical solution, the scrubbing tower 5 can chemically treat the exhaust gas and remove some of the pollutants in the exhaust gas.

[0035] In one embodiment of this utility model, an electrostatic dust removal tower 11 is also included, which is connected to the washing tower 6.

[0036] Through the above technical solution, the exhaust gas treated by the scrubbing tower enters the electrostatic precipitator 11 for further purification.

[0037] In one embodiment of the present invention, the exhaust end of the electrostatic dust removal tower 11 is provided with a first branch pipe 12 and a second branch pipe 13. The first branch pipe 12 is connected to the sintering kiln 1. The tower also includes a tail gas emission tower 14. The second branch pipe 13 is connected to the tail gas emission tower 14. Both the first branch pipe 12 and the second branch pipe 13 are provided with valves.

[0038] Through the above technical solution, the exhaust gas after being treated by the electrostatic precipitator 11 still has some heat. However, the temperature of the exhaust gas is already low at this time. When there is no subsequent production, it can be discharged into the exhaust gas emission tower 14. If production is still required, the exhaust gas can also be connected to the sintering kiln 1 to preheat the aluminum ash and further improve the utilization of the exhaust gas.

[0039] In one embodiment of this utility model, the exhaust gas delivery pipe 2, the pipe body 401, and the contact piece 402 are all made of copper.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An aluminum ash sintering system for corundum production, comprising a sintering kiln (1), characterized in that, Also includes: The tail gas conveying pipe (2) is connected to one side of the sintering kiln (1); Heat spreader (3), the heat spreader (3) is disposed on the outer side wall of the exhaust gas conveying pipe (2); A heat collection tube (4) is disposed inside the exhaust gas conveying pipe (2). The heat collection tube (4) consists of a tube body (401) and a contact piece (402). The tube body (401) is spiral in shape, and the radial direction of the spiral is the same as the radial direction of the exhaust gas conveying pipe (2). The contact piece (402) is spiral in shape and is disposed on the outer wall of the tube body (401). The radial direction of the contact piece (402) is the same as the radial direction of the exhaust gas conveying pipe (2). The heat exchange tube (5) is located inside the exhaust gas delivery pipe (2), and the heat exchange tube (5) is connected to an external water circulation device.

2. The aluminum ash sintering system for corundum production according to claim 1, characterized in that, It also includes a scrubbing tower (6), and the exhaust gas delivery pipe (2) is connected to the scrubbing tower (6).

3. The aluminum ash sintering system for corundum production according to claim 2, characterized in that, The washing tower (6) is fixedly equipped with a filter plate (7), and a water outlet pipe (8) is fixedly installed at the position below the filter plate (7). Multiple nozzles (9) are fixedly installed below the water outlet pipe (8).

4. The aluminum ash sintering system for corundum production according to claim 3, characterized in that, A water collection tank (10) is also provided at the bottom of the washing tower (6) corresponding to the nozzle (9).

5. The aluminum ash sintering system for corundum production according to claim 2, characterized in that, It also includes an electrostatic precipitator (11), which is connected to the washing tower (6).

6. The aluminum ash sintering system for corundum production according to claim 5, characterized in that: The exhaust end of the electrostatic dust removal tower (11) is provided with a first branch pipe (12) and a second branch pipe (13).

7. The aluminum ash sintering system for corundum production according to claim 6, characterized in that: The first branch pipe (12) is connected to the sintering kiln (1).

8. The aluminum ash sintering system for corundum production according to claim 7, characterized in that: It also includes an exhaust gas tower (14), and the second branch pipe (13) is connected to the exhaust gas tower (14).

9. The aluminum ash sintering system for corundum production according to claim 6, characterized in that: Both the first branch pipe (12) and the second branch pipe (13) are equipped with valves.

10. The aluminum ash sintering system for corundum production according to claim 1, characterized in that: The exhaust gas delivery pipe (2), the pipe body (401), and the contact piece (402) are all made of copper.

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