Lithium slag building material comprehensive utilization system

Abstract

The utility model discloses a lithium slag building material comprehensive utilization system which comprises a pretreatment structure, the pretreatment structure is composed of a desulfurization pretreatment module, an activity excitation module and a drying module, the drying module feeds dried lithium slag into a ball milling module for grinding, and the lithium slag passes through a sorting module after being ground by the ball milling module. The lithium slag meeting the fineness requirement is collected into the storage tank, the remaining lithium slag obtained after sorting enters the recycling module, the lithium slag, other solid waste and materials in the storage tank are compounded through the weighing and compounding module, and the compounded lithium slag cementing material is bagged through the bagging and transporting module. According to the lithium slag building comprehensive utilization system, the lithium slag can be subjected to desulfurization and activation treatment, and the activity of the lithium slag and the performance of the lithium slag mixed with concrete are improved; and meanwhile, through the structural design of the drying module, lithium slag attached to the inner wall of the drying cylinder can be conveniently cleaned, and waste caused by attachment of the raw materials is avoided.

Description

Technical Field

[0001] This utility model relates to the field of comprehensive utilization technology of lithium slag, specifically a comprehensive utilization system for lithium slag in building materials. Background Technology

[0002] With the rapid promotion of new energy vehicles, the lithium battery industry has also developed rapidly. Consequently, the amount of metallurgical solid waste—lithium slag—is increasing, leading to growing environmental pollution problems. Therefore, the harmless and resource-based treatment of lithium slag is urgently needed. The chemical composition of lithium slag is mainly SiO2 and Al2O3, with a content exceeding 70%. It exists primarily in an amorphous form and exhibits good pozzolanic activity. If lithium slag were used to replace cement and other building binders in concrete preparation, given the huge market size of building materials, it could not only absorb large amounts of stockpiled lithium slag and reduce construction costs, but also reduce carbon emissions, helping the construction industry achieve carbon peaking and carbon neutrality. However, existing publicly available treatment technologies lack key steps in the lithium slag treatment process and have not formed a complete system, which to some extent limits its application in the building materials field.

[0003] For example, a comprehensive treatment device and method for recycling waste lithium slag, disclosed in patent CN115654879A, includes a fixed platform, a drying mechanism, and a mixing mechanism. The fixed platform has the mixing and drying mechanisms arranged from bottom to top, which can efficiently complete the pretreatment of lithium slag. However, it also has the following problems: 1) Lack of a desulfurization pretreatment module. The sulfuric acid process is currently the mainstream process for processing spodumene to produce lithium carbonate. Therefore, the SO3 content in lithium slag is usually high, mainly in the form of gypsum and sodium sulfate. Excessive SO3 content can lead to stability issues, thus requiring a desulfurization module. 2) Lack of a cleaning module. Existing comprehensive treatment devices are not convenient for cleaning lithium slag adhering to the inner wall of the dryer during drying, leading to waste as lithium slag easily adheres to the inner wall. 3) Lack of a complete system. This patent only focuses on the treatment process of lithium slag and does not form a complete system for resource recycling, thus having certain limitations.

[0004] Therefore, we propose a comprehensive utilization system for lithium slag building materials to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide a comprehensive utilization system for lithium slag building materials, in order to solve the problems mentioned in the background art, such as the lack of desulfurization pretreatment mechanism, lack of cleaning module, and lack of a complete resource utilization system in lithium slag comprehensive utilization and treatment devices.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a comprehensive utilization system for lithium slag building materials, comprising a pretreatment structure, which consists of a desulfurization pretreatment module, an activation module, and a drying module. The drying module feeds the desulfurized, activated, and dried lithium slag into a ball mill module for grinding. After grinding by the ball mill module, the lithium slag that meets the required fineness is collected into a storage tank by a sorting module. The remaining lithium slag after sorting enters a recycling module. The lithium slag, other solid waste, and materials in the storage tank are compounded by a weighing and compounding module. The compounded lithium slag cementitious material is bagged by a bagging and transportation module.

[0007] Preferably, the lithium slag cementitious material compounded by the weighing and compounding module can be bagged by the bagging and transportation module, or it can be directly processed into concrete by the concrete mixing plant.

[0008] By adopting the above technical solutions, lithium slag can be conveniently utilized in different forms through the installation of transport modules and concrete mixing plants.

[0009] Preferably, the drying module includes a drying drum, one end of which is fitted with an end cap, and the other end of which is fixedly fitted with a servo motor. A first gear is fitted at the output end of the servo motor, a second gear is meshed with the lower part of the first gear, and a material-turning component is fitted at the middle of the second gear.

[0010] By adopting the above technical solution, the rotation of the first gear can drive the material turning component to rotate synchronously through the meshing connection of the second gear.

[0011] Preferably, the material turning component includes a central rod, and a branch rod is installed in the middle of the central rod. The branch rod is connected to a storage cavity opened in the middle of the central rod. A small electric telescopic rod is fixedly installed inside the central rod. A piston plate is fixedly installed at the telescopic end of the small electric telescopic rod. A moving rod is inserted inside the branch rod. A scraper is fixed at the end of the moving rod away from the central rod. An extension rod is fixed on the side of the scraper. The extension rod is connected to the central rod through an auxiliary spring. A mixing rod is fixedly installed on the scraper. A stirring frame is installed on the mixing rod.

[0012] By adopting the above technical solution, the lithium slag adhering to the inner wall of the drying drum can be cleaned by setting up scrapers.

[0013] Preferably, the piston plate is circumferentially connected to the storage chamber via a fixed sealing ring to form a seamless sliding connection structure, and the airflow inside the storage chamber can enter the interior of the branch rod.

[0014] By adopting the above technical solution, the sealing performance of the piston plate can be improved when it moves inside the storage chamber by using a sealing ring that is circumferentially fixed to the piston plate.

[0015] Preferably, the movable rod is slidable on the branch rod, and the longitudinal section of the scraper fixed at the outer end of the movable rod is set as an isosceles triangle structure.

[0016] By adopting the above technical solution, the scraper at the end of the moving rod can come into contact with the inner wall of the drying drum by moving the moving rod on the branch rod.

[0017] Preferably, the mixing racks are evenly distributed at equal intervals on the mixing rods, and the mixing rods are symmetrically arranged about the vertical central axis of the scraper.

[0018] By adopting the above technical solution, the stirring rack on the mixing rod can improve the turning effect of lithium slag inside the drying drum.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. Equipped with a desulfurization pretreatment unit: The sulfuric acid process is currently the mainstream technology for processing spodumene to produce lithium carbonate. The lithium slag, a byproduct of the sulfuric acid process, typically has a high SO3 content (up to 8.5%), mainly in the form of gypsum and sodium sulfate. When utilizing lithium slag for building material resource recovery, such as preparing active admixtures for use in cement concrete, excessively high SO3 content can lead to stability issues. The industry standard "Lithium Slag Powder for Cement and Concrete" (YB / T 4230) stipulates that the SO3 content of lithium slag should not exceed 8%. This invention incorporates a desulfurization pretreatment module into the pretreatment unit, effectively reducing the sulfur content to below 8%, improving its safety and environmental performance as an active admixture, and complying with the relevant provisions of the YB / T 4230 standard.

[0021] 2. It is equipped with a multi-functional module: (1) It is equipped with a ball mill module. After grinding, the lithium slag that meets the fineness requirements is collected and stored in the storage tank through the sorting module. The lithium slag that does not meet the fineness requirements is returned to the ball mill for further grinding and sorting. Then, the lithium slag, cement, other solid waste and activator in the storage tank are weighed and mixed in a certain proportion. The compounded lithium slag cementitious material can be bagged and transported to the market for sale, or it can be directly sent to a commercial concrete mixing plant to make commercial concrete and transported to the construction site for pouring, thereby improving the comprehensive utilization rate of lithium slag; (2) A mixing rod is provided, and the rotation of the central rod can drive the scraper and the mixing rod to rotate synchronously. The rotation of the scraper and the mixing rod can effectively turn over the lithium slag inside the drying barrel, thereby improving the drying effect of the lithium slag inside the drying barrel; (3) A scraper is provided, and the movement of the piston plate in the storage chamber inside the central rod can squeeze the airflow inside the storage chamber into the interior of the branch rod. After the airflow inside the branch rod increases, it will push the scraper to contact the inner wall of the drying barrel. Then, when the central rod rotates, the scraper can be used to scrape and clean the lithium slag attached to the barrel wall.

[0022] 3. Establishing a complete resource recycling system: Since the resource utilization of lithium slag in building materials is still in its early stages, currently available technologies only relate to the pretreatment of lithium slag. How to integrate the pretreatment stage with the production process to form a complete production system is a pressing technical challenge. This invention addresses the desulfurization and cleaning challenges in the pretreatment process while also integrating pretreatment, crushing, ball milling, sorting, storage, weighing and compounding, bagging and transportation, and use in concrete mixing plants to form a complete production system. This system is both scientific and practical, offering valuable reference for both lithium slag cementitious material manufacturers and solid waste-based cementitious concrete manufacturers. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the system flow of this utility model;

[0024] Figure 2 This is a schematic diagram of the first and second gears of this utility model;

[0025] Figure 3 This is a schematic diagram of the central rod and branch rod structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the moving rod and scraper structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the small electric telescopic pole of this utility model;

[0028] Figure 6 This utility model Figure 5 Enlarged structural diagram at point A in the middle.

[0029] In the diagram: 101, Desulfurization pretreatment module; 102, Activation module; 103, Drying module; 2, Crushing module; 3, Ball milling module; 4, Sorting module; 5, Storage tank; 6, Weighing and compounding module; 7, Bagging and transporting module; 8, Concrete mixing plant; 9, Drying drum; 10, End cap; 11, Servo motor; 12, First gear; 13, Second gear; 14, Center rod; 141, Branch rod; 142, Storage chamber; 143, Small electric telescopic rod; 144, Piston plate; 145, Moving rod; 146, Scraper; 147, Extension rod; 148, Auxiliary spring; 149, Mixing rod; 1410, Mixing rack. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1: Please refer to Figures 1-6 This embodiment discloses a comprehensive utilization system for lithium slag building materials, which includes a pretreatment structure consisting of a desulfurization pretreatment module 101, an activation module 102, and a drying module 103.

[0032] After the lithium slag enters the desulfurization pretreatment module 101 via the conveying system, it is treated by a wet desulfurization process. Specifically, the module is equipped with a desulfurization reaction tank, into which a desulfurizing agent is added and mixed under stirring conditions. After passing through aging and water washing processes, it is then conveyed to the activation module 102.

[0033] The activation module 102 is equipped with a high-temperature heating furnace and a spraying device. After the lithium slag is heated, the temperature inside the furnace rises to 1100℃. After calcination for 1 hour, heating is stopped, and the spraying device is turned on for rapid cooling. When the temperature of the lithium slag drops to room temperature, the activation process ends, and the lithium slag is sent to the drying module 103.

[0034] See the structural reference for drying module 103. Figures 2-6After opening end cap 10 and placing lithium slag into drying drum 9, close end cap 10. The heating element on drying drum 9 dries the lithium slag inside. During drying, servo motor 11 is activated. Activation of servo motor 11 causes the center rod 14 to rotate via the first gear 12 and the meshing second gear 13. Rotation of center rod 14 causes the moving rod 145 and extension rod 147 to rotate synchronously. Rotation of extension rod 147 drives scraper 146 to rotate, which in turn agitates the lithium slag inside drying drum 9. When further processing of the lithium slag inside drying drum 9 is required, small electric telescopic rod 143 is activated. The opening of the electric telescopic rod 143 allows the piston plate 144 to move inside the storage chamber 142. After the piston plate 144 moves, it forces the airflow inside the storage chamber 142 into the branch rod 141. The increased airflow inside the branch rod 141 pushes the moving rod 145 and the scraper 146 to move, causing the end of the scraper 146 to contact the inner wall of the drying drum 9. Then, the central rod 14 drives the scraper 146 to rotate, allowing the scraper 146 to clean the lithium residue adhering to the inner wall of the drying drum 9. It should be noted that the central rod 14 does not cause the scraper 146 to be thrown outwards due to centrifugal force during rotation. This adjustable scraper 146 prevents it from constantly contacting the inner wall of the drying drum 9 during rotation, extending its service life.

[0035] The dried lithium slag is fed into crushing module 2 for crushing. After crushing large pieces of lithium slag, it is sent to ball mill module 3 for grinding. It should be noted that if the dried lithium slag particles are small, they may not need to be crushed and can be directly fed into ball mill module 3 for grinding. The lithium slag ground in ball mill module 3 is then sorted by sorting module 4. Lithium slag that meets the fineness requirement is collected in storage tank 5, while lithium slag that does not meet the fineness requirement is ground again in ball mill module 3 and then sent to storage tank 5 after passing through sorting module 4. The lithium slag, other solid waste, and materials in storage tank 5 are then compounded by weighing and compounding module 6 to form lithium slag cementitious material. This material can then be bagged by bagging and transport module 7 or directly sent to concrete mixing plant 8 to be made into concrete.

[0036] Example 2: The technical content disclosed in this example is a further improvement on the basis of Example 1 above. The following content is disclosed in this example: a mixing rod 149 is fixedly installed on the scraper 146, and a stirring frame 1410 is installed on the mixing rod 149. Multiple stirring frames 1410 are evenly distributed at equal intervals on the mixing rod 149, and the mixing rod 149 is symmetrically arranged about the vertical central axis of the scraper 146.

[0037] When the lithium slag is dried inside the drying drum 9, the scraper 146 rotates with the central rod 14. The rotation of the scraper 146 can drive the mixing rod 149 to rotate synchronously. When the mixing rod 149 rotates, it can cause the stirring rack 1410 on it to rotate synchronously. The rotation of the mixing rod 149 and the stirring rack 1410 can improve the turning effect of the lithium slag inside the drying drum 9, so that the lithium slag can be dried evenly.

[0038] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0039] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A comprehensive utilization system for lithium slag building material, comprising a pretreatment structure composed of a desulfurization pretreatment module (101), an active activation module (102) and a drying module (103), characterized in that: The drying module (103) sends the desulfurized, activated and dried lithium slag into the ball mill module (3) for grinding, the ball mill module (3) is ground through the sorting module (4), and the lithium slag meeting the fineness is collected into the storage tank (5), the remaining lithium slag after sorting enters the recycling module, and the lithium slag in the storage tank (5), other solid wastes and materials are compounded by the weighing and compounding module (6), and the lithium slag cementing material compounded by the weighing and compounding module (6) is bagged by the bagging and transporting module (7).

2. The system for comprehensive utilization of lithium slag building materials according to claim 1, characterized in that: The lithium slag cementing material compounded by the weighing and compounding module (6) can be bagged by the bagging and transporting module (7), or directly made into concrete by the concrete mixing station (8).

3. The system for comprehensive utilization of lithium slag building materials according to claim 1, characterized in that: The drying module (103) comprises a drying barrel (9), one end of the drying barrel (9) is provided with an end cover (10), the other end of the drying barrel (9) is fixedly provided with a servo motor (11), the output end of the servo motor (11) is provided with a first gear (12), the lower portion of the first gear (12) is connected with a second gear (13) in a meshing mode, and the middle portion of the second gear (13) is provided with a material turning component.

4. The system for comprehensive utilization of lithium slag building materials according to claim 3, characterized in that: The material turning component comprises a center rod (14), a branch rod (141) is arranged on the middle portion of the center rod (14), the branch rod (141) is in communication with a storage cavity (142) formed in the middle portion of the center rod (14), a small electric telescopic rod (143) is fixedly arranged in the center rod (14), the telescopic end of the small electric telescopic rod (143) is fixedly provided with a piston plate (144), a moving rod (145) is inserted into the branch rod (141), the end of the moving rod (145) away from the center rod (14) is fixedly provided with a scraper (146), the side of the scraper (146) is fixedly provided with an extension rod (147), the extension rod (147) is connected with the center rod (14) through an auxiliary spring (148), the scraper (146) is fixedly provided with a mixing rod (149), and the mixing rod (149) is provided with a stirring frame (1410).

5. The system for comprehensive utilization of lithium slag building materials according to claim 4, characterized in that: The circumferential direction of the piston plate (144) is connected with the storage cavity (142) in a seamless sliding connection mode through a fixed sealing ring, and the airflow in the storage cavity (142) can enter the inside of the branch rod (141).

6. The system for comprehensive utilization of lithium slag building materials according to claim 4, characterized in that: The moving rod (145) can slide on the branch rod (141), and the scraper (146) fixedly arranged at the outer end of the moving rod (145) is arranged in an isosceles triangle structure in longitudinal section.

7. The system for comprehensive utilization of lithium slag building materials according to claim 4, characterized in that: The stirring frame (1410) is uniformly distributed on the mixing rod (149) at equal intervals, and the mixing rod (149) is symmetrically arranged about the vertical central axis of the scraper (146).

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