Treatment device for spodumene acidification roasting tail gas
By designing a spodumene acidified and calcined exhaust gas treatment device including a secondary cyclone preheater, an integrated dust-nitrifying removal device and a desulfurization device, the problem of high energy consumption of spodumene exhaust gas treatment in the prior art is solved, efficient dust removal, denitrification and waste heat recovery are achieved, and total energy consumption is reduced.
Patent Information
- Application Number
- CN202421088816.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-17
AI Technical Summary
The existing spodumene exhaust gas treatment process has problems such as high energy consumption, equipment blockage and increased operating costs, and the high-temperature bagging process and the elution acid process of SCR sodium hydroxide solution consume a lot of energy.
A treatment device for acidified and calcined exhaust gas of spodumene is designed, including a secondary cyclone preheater, an integrated dust-nitrification device and a desulfurization device. Through the combination of high-temperature dust removal and SCR reactor, efficient dust removal and denitrification of flue gas is achieved, and energy consumption is reduced by using waste heat recovery device.
The device can effectively treat spodumene acidified roasted exhaust gas under low energy consumption, avoid blockage problems caused by the settlement of deacid agents in low temperature environments, save device materials and land occupation, and further reduce energy consumption through waste heat recovery.
Smart Images
Figure CN222658219U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of industrial tail gas treatment devices, in particular to a device for treating tail gas from acidification and roasting of spodumene. Background Art
[0002] As a rare metal element, lithium is widely used in many fields such as glass, petroleum, chemicals, batteries, refrigeration equipment and military supplies. With the development of new energy vehicles, the demand for lithium batteries has grown rapidly, and the demand for lithium salts has also continued to increase. As the main lithium salt, spodumene has the advantages of fast production capacity release, no weather influence, and good product quality, which makes it widely used.
[0003] At present, the existing methods for extracting lithium from spodumene at home and abroad are mainly sulfuric acid methods, and the core process is the process of acidification and roasting to prepare spodumene acid clinker. In this process, a large amount of acid-containing tail gas will be generated, which needs to be purified to meet the emission standards.
[0004] Common processes for spodumene tail gas treatment: After the high-temperature flue gas at the tail of the kiln passes through the four-stage cyclone preheater, the temperature needs to be reduced to about 200°C. The polymer reagent is easy to settle, resulting in high energy consumption, equipment blockage, increased operating costs and other problems; the tail gas is treated by a high-temperature bag process. The tail gas + SCR sodium hydroxide solution is used to wash the deacidification bag. The sodium hydroxide solution is used to treat the acidic gas. It is not only expensive, but also requires subsequent post-processing such as evaporation and drying, which consumes a lot of energy.
[0005] Therefore, in view of the existing technical problems, a spodumene tail gas treatment device is needed with the two goals of reducing energy consumption and simplifying the process. Utility Model Content
[0006] The main purpose of the utility model is to provide a device for treating tail gas from acidification and roasting of spodumene, so as to solve the problem of high energy consumption in the process of treating tail gas from spodumene in the prior art.
[0007] In order to achieve the above-mentioned purpose, according to the first aspect of the utility model, a treatment device for spodumene acidification roasting tail gas is provided, which comprises: a secondary cyclone preheater, the secondary cyclone preheater having a flue gas outlet for discharging flue gas; an integrated dust and nitrate removal device, the integrated dust and nitrate removal device comprising an integrated high-temperature dust collector and a high-temperature SCR reactor, the high-temperature dust collector is connected to the flue gas outlet through a flue gas output pipe to remove dust and nitrate from the flue gas preheated by the secondary cyclone preheater, and the high-temperature SCR reactor has a dust-free flue gas outlet; and a desulfurization device, which is connected to the dust-free flue gas outlet to desulfurize the dust-free flue gas discharged from the dust-free flue gas outlet.
[0008] Furthermore, a deacidifying agent injection port is provided on the flue gas output pipeline between the secondary cyclone preheater and the integrated dust and nitrate removal device.
[0009] Furthermore, a plurality of high-temperature dust collectors are provided; and the plurality of high-temperature dust collectors are integrally connected to the high-temperature SCR reactor.
[0010] Furthermore, a high-temperature metal fiber filter bag is arranged in the high-temperature dust collector.
[0011] Furthermore, the material of the metal fiber filter bag includes nickel fiber or titanium fiber.
[0012] Furthermore, the high-temperature dust collector is provided with an ash discharge port, which is connected to the fly ash bin through an ash discharge pipe.
[0013] Furthermore, an ammonia spraying grid is arranged between the flue gas output pipeline and the high-temperature dust collector, the dust-removed nitrate flue gas outlet is connected to the inlet of the ammonia evaporator through an ammonia delivery pipe, and the outlet of the ammonia evaporator is connected to the inlet of the ammonia spraying grid through an ammonia delivery pipe.
[0014] Furthermore, the desulfurization device is provided with a desulfurization flue gas outlet, and the desulfurization flue gas outlet is connected to the inlet of the waste heat recovery device to recover the waste heat of the desulfurization flue gas.
[0015] Furthermore, the waste heat recovery device includes a filter, a waste heat boiler and an induced draft fan which are connected in sequence.
[0016] Furthermore, the induced draft fan is provided with an exhaust port, which is connected to the chimney inlet.
[0017] By applying the technical solution of the utility model, the tail gas of spodumene acidification and roasting is treated by the treatment device of the tail gas of spodumene acidification and roasting of the present application, so that the tail gas after the spodumene acidification and roasting reaction can pass through the secondary cyclone preheater and enter the subsequent reactor at a higher temperature (280-320°C), thereby avoiding the blockage of the pipeline caused by the easy sedimentation of the deacidification agent in a low temperature environment in the prior art. And the integrated dust and nitrate removal device can save the preparation materials and land occupation of the device while improving the dust removal and denitrification efficiency. At the same time, the denitrification reaction with a higher reaction temperature is first carried out, and then the desulfurization reaction with a lower reaction temperature requirement is carried out, which can reduce the energy consumption of the device treatment. Therefore, the treatment of the tail gas of spodumene acidification and roasting using the treatment device of the tail gas of spodumene acidification and roasting of the present application can obtain better treatment results with lower energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0019] Figure 1 The figure shows a connection schematic diagram of a device for treating tail gas from acidification and roasting of spodumene according to the utility model;
[0020] The above drawings include the following reference numerals:
[0021] 10. Secondary cyclone preheater; 20. Integrated dust and nitrate removal device; 21. High-temperature dust collector; 22. High-temperature SCR reactor; 23. Ammonia spray grid; 24. Ammonia evaporator; 30. Desulfurization device; 40. Waste heat recovery device; 41. Filter; 42. Waste heat boiler; 43. Induced draft fan; 50. Fly ash bin. DETAILED DESCRIPTION
[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below in conjunction with the embodiments.
[0023] like Figure 1 As shown, an embodiment of the utility model provides a treatment device for spodumene acidification roasting tail gas, the treatment device comprising: a secondary cyclone preheater 10, the secondary cyclone preheater 10 having a flue gas outlet for discharging flue gas; an integrated dust and nitrate removal device 20, the integrated dust and nitrate removal device 20 comprising an integrated high-temperature dust collector 21 and a high-temperature SCR reactor 22, the high-temperature dust collector 21 is connected to the flue gas outlet through a flue gas output pipe to remove dust and nitrate from the flue gas preheated by the secondary cyclone preheater 10, the high-temperature SCR reactor 22 has a dust-free flue gas outlet; and a desulfurization device 30, which is connected to the dust-free flue gas outlet to desulfurize the dust-free flue gas discharged from the dust-free flue gas outlet.
[0024] By applying the technical solution of the present application, the spodumene acidification and roasting tail gas is treated by a spodumene acidification and roasting tail gas treatment device including a secondary cyclone preheater, an integrated dust and nitrate removal device and a desulfurization device, which can reduce the energy consumption in the tail gas treatment process and improve the denitrification and desulfurization reaction efficiency. Among them, the temperature of the flue gas discharged through the secondary cyclone preheater is about 280-320°C, and the added deacidification agent is not easy to settle at this temperature, causing pipeline blockage. And the temperature loss of the flue gas at this high temperature is not large in the integrated dust and nitrate removal device. Therefore, the high temperature reaction temperature in the high temperature dust collector 21 and the high temperature SCR reactor 22 is about 280-320°C.
[0025] Among them, the method of adding the deacidifying agent is not limited, as long as the deacidifying agent can be added to the reaction device for deacidification reaction. In a preferred embodiment, a deacidifying agent injection port is provided on the flue gas output pipeline between the secondary cyclone preheater 10 and the integrated dust removal device 20. During the use of the device, the deacidifying agent, such as baking soda powder, can be sprayed into the device through the deacidifying agent injection port and enter the integrated dust removal device 20. No reaction tower is required. The removal of acidic gases such as SO2 is completed by instantaneous injection and short-term contact with the flue gas, which can ensure efficient desulfurization.
[0026] The number of the high-temperature dust collectors 21 is not limited, as long as the dust removal effect on the flue gas can be achieved. In a preferred embodiment, a plurality of high-temperature dust collectors 21 are provided, and the plurality of high-temperature dust collectors 21 are integrally connected with the high-temperature SCR reactor 22. According to the dust content of the flue gas and the dust removal efficiency of the high-temperature dust collector 21, an appropriate number of high-temperature dust collectors 21 are provided to complete the dust removal of the flue gas.
[0027] Any type of filter material that can achieve dust removal effect contained in the high temperature dust collector 21 is suitable for this application. In a preferred embodiment, a high temperature metal fiber filter bag is provided in the high temperature dust collector 21. The high temperature metal fiber filter bag is resistant to high temperature, has high dust collection efficiency, can be used for a long time, and saves the operating cost of the device. And the above-mentioned sprayed deacidification agent can adhere to the surface of the filter bag to continue to complete the deacidification reaction to improve the deacidification efficiency.
[0028] The material of the metal fiber filter bag in the high temperature metal fiber filter bag is not limited, and any material that can achieve high temperature resistance and dust removal effect is acceptable. In a preferred embodiment, the material of the metal fiber filter bag includes nickel fiber or titanium fiber.
[0029] In order to efficiently remove dust from flue gas, the dust collected in the high-temperature dust collector 21 is discharged from the reactor at the same time. In a preferred embodiment, the high-temperature dust collector 21 is provided with an ash discharge port, which is connected to the fly ash bin 50 through an ash discharge pipe. With the above device structure, the collected dust can be discharged from the high-temperature dust collector 21 in a timely manner, thereby improving the dust removal efficiency.
[0030] In order to efficiently carry out the denitration reaction, the reducing agent in the reaction needs to be fully mixed with the dust-free and denitration flue gas. In a preferred embodiment, an ammonia spraying grid 23 is arranged between the flue gas output pipeline and the high-temperature dust collector 21, and the dust-free and denitration flue gas outlet is connected to the inlet of the ammonia evaporator 24 through an ammonia delivery pipe, and the outlet of the ammonia evaporator 24 is connected to the inlet of the ammonia spraying grid 23 through an ammonia delivery pipe. The ammonia evaporator 24 is a raw material supply device for the reducing agent ammonia water, which evaporates the ammonia water through the ammonia spraying grid 23 and sprays it into the high-temperature dust collector 21 in the form of gas, so that the reducing agent and the dust-free and denitration flue gas can be fully mixed, thereby improving the denitration efficiency.
[0031] The flue gas after desulfurization has a certain amount of heat, which can be recovered and reused. In a preferred embodiment, the desulfurization device 30 is provided with a desulfurization flue gas outlet, which is connected to the inlet of the waste heat recovery device 40 to recover the waste heat of the desulfurization flue gas. The flue gas after desulfurization is recovered through the waste heat recovery device 40 to achieve the technical effect of energy saving and environmental protection in the treatment process.
[0032] Any device capable of recovering waste heat from desulfurized flue gas is applicable to the present application. In a preferred embodiment, the waste heat recovery device 40 comprises a filter 41, a waste heat boiler 42 and an induced draft fan 43 connected in sequence. The filter 41 further removes impurities from the desulfurized flue gas to ensure that the desulfurized flue gas can meet the emission standards.
[0033] After the flue gas reaches the emission standard after the waste heat recovery, it is discharged. In a preferred embodiment, the induced draft fan 43 is provided with an exhaust port, which is connected to the chimney inlet. The flue gas that has undergone a series of treatment processes is finally discharged into the atmosphere through the chimney, completing the entire treatment process.
[0034] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: the spodumene acidification and roasting tail gas treatment device of the present application is used to treat the spodumene acidification and roasting tail gas, which greatly reduces the energy consumption of the device. The tail gas after the spodumene acidification and roasting reaction can pass through the secondary cyclone preheater and enter the subsequent reactor at a higher temperature (280-320°C), avoiding the blockage of the pipeline caused by the easy sedimentation of the deacidification agent in the prior art under low temperature environment. And the integrated dust and nitrate removal device can save the preparation materials and land occupation of the device while improving the dust removal and denitrification efficiency. In addition, the waste heat recovery device recycles and reuses the heat of the flue gas, which greatly saves the energy consumption of the device and is more green and environmentally friendly. Therefore, using the spodumene acidification and roasting tail gas treatment device of the present application to treat the spodumene acidification and roasting tail gas can obtain better treatment results with lower energy consumption.
[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A device for treating tail gas from spodumene acidification roasting, characterized in that: The processing device comprises: A secondary cyclone preheater (10), wherein the secondary cyclone preheater (10) has a flue gas outlet for discharging flue gas; An integrated dust and saltpeter removal device (20), the integrated dust and saltpeter removal device (20) comprising an integrated high-temperature dust collector (21) and a high-temperature SCR reactor (22), the high-temperature dust collector (21) being connected to the flue gas outlet via a flue gas output pipeline to remove dust and saltpeter from the flue gas preheated by the secondary cyclone preheater (10), the high-temperature SCR reactor (22) having a dust and saltpeter removal flue gas outlet; and A desulfurization device (30) is connected to the dust-removed fume outlet to desulfurize the dust-removed fume discharged from the dust-removed fume outlet.
2. The processing device according to claim 1, characterized in that The flue gas output pipeline between the secondary cyclone preheater (10) and the integrated dust and saltpeter removal device (20) is provided with a deacidification agent injection port.
3. The processing device according to claim 1, characterized in that The high-temperature dust collector (21) is provided in plurality; The plurality of high-temperature dust collectors (21) are integrally connected to the high-temperature SCR reactor (22).
4. The processing device according to claim 1 or 3, characterized in that: A high-temperature metal fiber filter bag is arranged in the high-temperature dust collector (21).
5. The processing device according to claim 4, characterized in that The material of the metal fiber filter bag includes nickel fiber or titanium fiber.
6. The processing device according to claim 1, characterized in that The high-temperature dust collector (21) is provided with an ash discharge port, and the ash discharge port is connected to the fly ash bin (50) through an ash discharge pipe.
7. The processing device according to claim 1, characterized in that An ammonia spraying grid (23) is arranged between the flue gas output pipeline and the high-temperature dust collector (21); the dust-removed nitrate flue gas outlet is connected to the inlet of the ammonia evaporator (24) via an ammonia delivery pipe; and the outlet of the ammonia evaporator (24) is connected to the inlet of the ammonia spraying grid (23) via an ammonia delivery pipe.
8. The processing device according to claim 1, characterized in that The desulfurization device (30) is provided with a desulfurization flue gas outlet, and the desulfurization flue gas outlet is connected to the inlet of the waste heat recovery device (40) to recover the waste heat of the desulfurization flue gas.
9. The processing device according to claim 8, characterized in that The waste heat recovery device (40) comprises a filter (41), a waste heat boiler (42) and an induced draft fan (43) which are connected in sequence.
10. The processing device according to claim 9, characterized in that The induced draft fan (43) is provided with an exhaust port, and the exhaust port is connected to the chimney inlet.