Preparation method of sulfate-resistant lithium slag-based cementing material and detoxification treatment device

Abstract

The invention provides a preparation method of a sulfate-resistant lithium slag-based cementing material and a detoxification treatment device. Relates to the field of maritime work cement, in particular to a preparation method of a sulfate-resistant lithium slag-based cementing material, which is characterized by comprising the following steps: S1, directly adding deionized water according to a liquid-solid ratio of 1: 2-1: 3 into lithium smelting slag without drying, adding Na2S according to a mass ratio of 0.05-0.1% of the mass of the lithium slag, stirring for 1 hour at normal temperature in a reaction kettle, and then adding sodium sulfate according to a mass ratio of 1: 2-1: 3; and performing plate-frame pressure filtration and solid-liquid separation to obtain detoxified and pre-activated lithium slag. According to the preparation method of the sulfate-resistant lithium slag-based cementing material and the detoxification treatment device provided by the invention, through integrated treatment of detoxification and activation of the lithium slag, the use safety and activity of the lithium slag are ensured, and meanwhile, the sulfate-resistant performance of the lithium slag-based cementing material is remarkable; the problem of safe, large-scale and high-value utilization of the lithium smelting slag, which troubles the industry for many years, is fundamentally solved, and a support is provided for green development of the industry of extracting lithium from lithium ore.

Description

Technical Field

[0001] This invention relates to the field of marine cement, and in particular to a method for preparing and a detoxification treatment device for a lithium sulfate-resistant slag-based cementitious material. Background Technology

[0002] Lithium carbonate is a core raw material for power batteries and energy storage batteries. Its green and stable supply is the key to the sustainable development of the industry. However, my country's dependence on foreign lithium resources has long been higher than 60%. Lithium mica, as a unique resource accounting for 40% of the country's lithium oxide reserves, has become a strategic cornerstone for ensuring the security of my country's lithium industry chain.

[0003] The existing lithium mica produces a large amount of lithium slag in the traditional lithium extraction process, thus facing a severe challenge in solid waste disposal. Due to the limitation of ore grade, 30-50 tons of lithium slag are generated for every ton of lithium carbonate production, resulting in tens of millions of tons of lithium mica smelting slag every year. This has become a major bottleneck restricting the sustainable development of the national lithium battery industry. A large amount of solid waste from lithium smelting slag cannot be recycled and reused, leading to the problem of lithium slag disposal.

[0004] Therefore, it is necessary to provide a method for preparing resistant lithium sulfate slag-based cementitious materials and a detoxification treatment device to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a method for preparing sulfate-resistant lithium slag-based cementitious materials and a detoxification treatment device, which solves the problems of lithium smelting slag not being able to be utilized at high value and the difficulty in disposing of lithium slag.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for preparing a lithium sulfate-resistant slag-based cementitious material, comprising the following steps:

[0007] S1: Lithium smelting slag does not need to be dried. Add deionized water directly at a liquid-to-solid ratio of 1:2-1:3, and add water at a mass ratio of 0.05-0.1% of the lithium slag. After stirring at room temperature for 1 hour in a reactor, the detoxified and pre-activated lithium slag was obtained by solid-liquid separation by plate and frame filter press.

[0008] S2: Dry lithium slag, blast furnace granulated slag and silicate clinker to a moisture content of <0.5%, and then grind them to form a particle size distribution;

[0009] S3: Grinded lithium slag powder, slag powder, clinker powder, fly ash, gypsum, quicklime, and aluminum-based additives are thoroughly mixed and homogenized in a certain proportion to obtain lithium slag-based sulfate-resistant cementitious material.

[0010] Preferably, in S3, the proportions of each raw material in the lithium slag-based sulfate-resistant cementitious material are: 20%-40% lithium slag powder, 25%-45% slag powder, 5%-15% clinker powder, 1%-8% fly ash, 5%-10% gypsum, 5%-10% quicklime, and 0.1%-3% aluminum additives.

[0011] Preferably, in step S1, the toxic elements such as fluorine, beryllium, and thallium in the lithium slag can be significantly reduced in toxicity after detoxification treatment, and The solution is alkaline, and during the detoxification process of lithium slag, the Al-O bonds can be opened, enhancing the hydration activity of the lithium slag. In step S2, the specific surface area of ​​the lithium slag is ground to 500-700 m². 2 / kg, the specific surface area of ​​granulated blast furnace slag is ground to 600-800m² 2 / kg, the specific surface area of ​​silicate clinker is ground to 300-500m² 2 / kg.

[0012] A detoxification treatment device includes: a reaction vessel, the top of which is connected to a feed inlet, and the bottom of which is connected to a drain pipe;

[0013] A spiral feeding mechanism is provided, which is connected to the top of the reactor. The spiral feeding mechanism includes a spiral feeding box and a discharge funnel. The discharge funnel is connected to the top of the reactor. The spiral feeding box is mounted on the ground via a bracket. Two spiral feeders are rotatably mounted on the inner wall of the spiral feeding box. The two spiral feeders are fitted together. One end of each spiral feeder is fixedly mounted with an extension shaft. One end of each extension shaft passes through the inner wall of the spiral feeding box and extends to the outside. The two extension shafts are connected by a belt drive. One end of one of the extension shafts is fixedly connected to a feeding motor. The feeding motor is fixedly mounted on one side of the spiral feeding box via a support plate. The top of the spiral feeding box is connected to the inlet funnel, and the bottom of the spiral feeding box is connected to the top of the reactor via the discharge funnel.

[0014] A deionized water supply mechanism is provided for supplying deionized water to the reactor.

[0015] Preferably, the deionized water mechanism is connected to the top of the reactor. The deionized water mechanism includes a deionized water pipe and a deionized water tank. The deionized water pipe is connected to the top of the reactor, the deionized water tank is located on the ground, and a deionized water pump is fixedly installed on the top of the deionized water tank. The end of the deionized water pipe is connected to the outlet of the deionized water pump, and the pumping end of the deionized water pump is connected to the interior of the deionized water tank through a pumping pipe.

[0016] Preferably, the end of the drain pipe is connected to a extraction mechanism, the extraction mechanism includes an extraction pipe, one end of the extraction pipe is connected to the end of the drain pipe, the other end of the extraction pipe is connected to an extraction pump, the extraction pump is installed on the ground, and the output end of the extraction pump is connected to a connecting pipe.

[0017] Preferably, the top end of the connecting pipe is connected to a plate and frame filter press, the bottom of the plate and frame filter press is provided with a lithium slag box, the outlet end of the plate and frame filter press is provided with a waste liquid box, and both the lithium slag box and the waste liquid box are located on the ground.

[0018] Preferably, a stirring mechanism is fixedly installed on the top of the inner wall of the reactor. The stirring mechanism includes a stirring motor, which is fixedly installed on the top of the inner wall of the reactor. The output shaft of the stirring motor is fixedly connected to a stirring shaft, and a plurality of stirring blades are fixedly installed on the surface of the stirring shaft by a fixing ring.

[0019] Preferably, an electromagnet controller is fixedly mounted on the surface of the output shaft of the stirring motor. The outer wall of the electromagnet controller is fixedly mounted to the inner wall of the reactor by four magnetic strips. Four side wall scrapers are fixedly mounted on one end of each of the stirring blades, and the four side wall scrapers are adapted to the inner wall of the reactor.

[0020] Preferably, a scraper mechanism is provided between every two magnetic strips, and four scraper mechanisms are provided. Each scraper mechanism includes a first magnetic plate and a second magnetic plate. The first magnetic plate and the second magnetic plate are attracted to two magnetic strips respectively. A first scraper is fixedly installed at the bottom of the first magnetic plate. A second scraper is fixedly connected to one side of the first scraper through a connecting plate. The top of the second scraper is fixedly installed to the bottom of the second magnetic plate. A float ball is fixedly installed at the bottom of the connecting plate through a support column. The first scraper and the second scraper are adapted to the stirring blade.

[0021] Compared with related technologies, the preparation method of the sulfate-resistant lithium slag-based cementitious material provided by the present invention has the following beneficial effects:

[0022] This invention provides a method for preparing sulfate-resistant lithium slag-based cementitious materials. Through integrated detoxification and activation treatment of lithium slag, the safety and activity of lithium slag are ensured. The lithium slag-based cementitious materials meet the requirements of the general silicate cement GB 42.5 standard and can be widely used in the highway and construction fields. At the same time, the lithium slag-based cementitious materials have significant sulfate resistance and can be used in special scenarios such as underground tunnels, near-shore engineering that meet marine cement standards, and wastewater soil improvement. This fundamentally solves the problem of safe, large-scale, and high-value utilization of lithium smelting slag that has plagued the industry for many years, and provides support for the green development of the lithium ore extraction industry. Attached Figure Description

[0023] Figure 1 SEM image of the sulfate-resistant lithium slag-based cementitious material provided by this invention;

[0024] Figure 2 This is a schematic diagram of a preferred embodiment of a detoxification treatment device provided by the present invention;

[0025] Figure 3 This is another structural schematic diagram of a preferred embodiment of a detoxification treatment device provided by the present invention;

[0026] Figure 4 for Figure 2 The diagram shown is a structural schematic of the screw feeding mechanism.

[0027] Figure 5 for Figure 2 The diagram shown is a structural schematic of the deionized water mechanism.

[0028] Figure 6 A schematic diagram of a second embodiment of a detoxification treatment device;

[0029] Figure 7 Another structural schematic diagram of a second embodiment of a detoxification treatment device;

[0030] Figure 8 for Figure 7 The diagram shows the structure of the extraction mechanism;

[0031] Figure 9 for Figure 7 The diagram shows the installation of the side wall scraper;

[0032] Figure 10 for Figure 9 The diagram shows the installation of the magnetic strip;

[0033] Figure 11 for Figure 9 The diagram shows the structure of the stirring mechanism.

[0034] Figure 12 for Figure 10 The diagram shows the installation of the electromagnet controller.

[0035] Figure 13 for Figure 12 The diagram shows the structure of the scraper mechanism.

[0036] Numbered in the diagram: 1. Reactor; 2. Screw feeder; 201. Screw feeder box; 202. Screw feeder; 203. Extension shaft; 204. Belt; 205. Feed motor; 206. Feed hopper; 207. Discharge hopper; 3. Deionized water system; 301. Deionized water tank; 302. Deionized water pump; 303. Deionized water pipe; 4. Feed inlet; 5. Drain pipe; 6. Extraction mechanism; 601. Extraction pipe; 60 2. Extraction pump; 603. Connecting pipe; 7. Plate and frame filter press; 8. Stirring mechanism; 801. Stirring motor; 802. Stirring shaft; 803. Stirring blade; 9. Scraper mechanism; 901. First magnetic plate; 902. First scraper; 903. Connecting plate; 904. Second scraper; 905. Second magnetic plate; 906. Float; 10. Side wall scraper; 11. Electromagnet controller; 12. Magnetic strip; 13. Lithium slag box; 14. Waste liquid box. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] A method for preparing a lithium sulfate slag-resistant cementitious material

[0039]

[0040] Table 1: Physical and mechanical properties of sulfate-resistant lithium slag-based cementitious materials

[0041]

[0042] Table 2: Sulfate Resistance Properties of Sulfate-Resistant Lithium Slag-Based Cementitious Materials

[0043] Please refer to the following: Figure 1 Tables 1 and 2. A method for preparing a lithium sulfate-resistant slag-based cementitious material includes the following steps:

[0044] S1: Lithium smelting slag does not need to be dried. Add deionized water directly at a liquid-to-solid ratio of 1:2-1:3, and add water at a mass ratio of 0.05-0.1% of the lithium slag. After stirring at room temperature for 1 hour in a reactor, the detoxified and pre-activated lithium slag was obtained by solid-liquid separation by plate and frame filter press.

[0045] S2: Dry lithium slag, blast furnace granulated slag and silicate clinker to a moisture content of <0.5%, and then grind them to form a particle size distribution;

[0046] S3: Grinded lithium slag powder, slag powder, clinker powder, fly ash, gypsum, quicklime, and aluminum-based additives are thoroughly mixed and homogenized in a certain proportion to obtain lithium slag-based sulfate-resistant cementitious material.

[0047] In S3, the proportions of each raw material in the lithium slag-based sulfate-resistant cementitious material are as follows: 20%-40% lithium slag powder, 25%-45% slag powder, 5%-15% clinker powder, 1%-8% fly ash, 5%-10% gypsum, 5%-10% quicklime, and 0.1%-3% aluminum additives.

[0048] In step S1, the toxic elements such as fluorine, beryllium, and thallium in the lithium slag can be significantly reduced in toxicity after detoxification treatment. The solution is alkaline, and during the detoxification process of lithium slag, the Al-O bonds can be opened, enhancing the hydration activity of the lithium slag. In step S2, the specific surface area of ​​the lithium slag is ground to 500-700 m². 2 / kg, the specific surface area of ​​granulated blast furnace slag is ground to 600-800m² 2 / kg, the specific surface area of ​​silicate clinker is ground to 300-500m² 2 / kg.

[0049] Compressive strength test

[0050] The lithium slag-based sulfate-resistant cementitious material has a 3-day compressive strength of 19.9 MPa and a 28-day compressive strength of 44.3 MPa, which meets the requirements of the general-purpose silicate cement standard GB 42.5.

[0051] Mortar test blocks prepared from lithium slag-based sulfate-resistant cementitious materials were subjected to sulfate erosion resistance tests according to GB / T 50082 standard. After solution erosion, the strength of the cementitious mortar specimen was higher than that before erosion, showing a significant resistance to sulfate erosion. The main mechanism by which lithium slag-based cementitious materials have strong resistance to sulfate erosion is that after the lithium slag is detoxified and activated, the Al-O bonds are opened in advance. During the hydration process, the cementitious material first forms a large amount of ettringite to provide early strength. Later strength is supported by the stable three-dimensional structure formed by the coating and filling of ettringite with hydrated calcium silicate. Therefore, after the formation of a stable three-dimensional structure, the specimen's resistance to sulfate corrosion will be greatly improved.

[0052] Compared with related technologies, the preparation method of the sulfate-resistant lithium slag-based cementitious material provided by the present invention has the following beneficial effects:

[0053] By integrating lithium slag detoxification and activation, the safety and activity of lithium slag are ensured. The lithium slag-based cementitious material meets the requirements of the general silicate cement GB 42.5 standard and can be widely used in the highway and construction fields. At the same time, the lithium slag-based cementitious material has significant sulfate resistance and can be used in special scenarios such as underground tunnels, near-shore engineering that meet marine cement standards, and sewage soil improvement. This fundamentally solves the problem of safe, large-scale, and high-value utilization of lithium smelting slag that has plagued the industry for many years, and provides support for the green development of the lithium ore extraction industry.

[0054] A detoxification treatment device

[0055] First Embodiment

[0056] Please refer to the following: Figures 2-5 A detoxification treatment device includes: a reaction vessel 1, the top of which is connected to a feed inlet 4, and the bottom of which is connected to a drain pipe 5;

[0057] A spiral feeding mechanism 2 is connected to the top of the reactor 1. The spiral feeding mechanism 2 includes a spiral feeding box 201 and a discharge funnel 207. The discharge funnel 207 is connected to the top of the reactor 1. The spiral feeding box 201 is mounted on the ground via a bracket. Two spiral feeders 202 are rotatably mounted on the inner wall of the spiral feeding box 201. The two spiral feeders 202 are fitted together, and an extension shaft 203 is fixedly mounted at one end of each spiral feeder 202. One end of each of the extension shafts 203 penetrates the inner wall of the screw feed box 201 and extends to the outside. The two extension shafts 203 are connected by a belt 204. One end of one of the extension shafts 203 is fixedly connected to a feeding motor 205. The feeding motor 205 is fixedly installed on one side of the screw feed box 201 by a support plate. The top of the screw feed box 201 is connected to a feed funnel 206, and the bottom of the screw feed box 201 is connected to the top of the reactor 1 through a discharge funnel 207.

[0058] Deionized water mechanism 3 is used to supply deionized water to the reactor 1.

[0059] The deionized water mechanism 3 is connected to the top of the reactor 1. The deionized water mechanism 3 includes a deionized water pipe 303 and a deionized water tank 301. The deionized water pipe 303 is connected to the top of the reactor 1. The deionized water tank 301 is set on the ground. A deionized water pump 302 is fixedly installed on the top of the deionized water tank 301. The end of the deionized water pipe 303 is connected to the outlet end of the deionized water pump 302. The pumping end of the deionized water pump 302 is connected to the inside of the deionized water tank 301 through a pumping pipe.

[0060] In actual use, both the feed inlet 4 and the drain pipe 5 are opened manually.

[0061] The working principle of the detoxification treatment device provided by this invention is as follows:

[0062] First, lithium smelting slag is fed into the screw feeder box 201 through the feed hopper 206. The feed motor 205 is started to drive the extension shaft 203 to rotate. The two extension shafts 203 are connected by a belt 204. The two extension shafts 203 drive the two screw feeders 202 to rotate, crushing the lithium smelting slag into small pieces and conveying the lithium slag to the discharge hopper 207. The lithium slag falls into the interior of the reactor 1 through the discharge hopper 207.

[0063] Then, the deionized water pump 302 is started to draw deionized water from inside the deionized water tank 301 and discharge it into the reactor 1 through the deionized water pipe 303. The deionized water is then manually added through the feed inlet 4. To the inside of reactor 1.

[0064] Finally, after reacting for a period of time, toxic elements such as fluorine, beryllium, and thallium in the lithium slag are removed. After detoxification treatment, the toxicity can be greatly reduced, and the mixed slurry is discharged by opening the drain pipe 5.

[0065] Compared with related technologies, the detoxification treatment device provided by the present invention has the following beneficial effects:

[0066] By setting the feeding motor 205 to drive two screw feeders 202, which have both crushing and conveying functions, large pieces of smelting slag are crushed into uniform small pieces to increase the contact area for subsequent reactions. At the same time, closed conveying is achieved to reduce dust emission and the risk of human contact. Deionized water is introduced through the deionized water pump 302 and fed into the feed inlet 4. Lithium slag, as a detoxifying agent, reduces toxicity, which helps optimize reaction conditions, improves treatment efficiency, and meets environmental emission and resource utilization standards.

[0067] Second Embodiment

[0068] Please refer to the following: Figures 6-13 Based on the detoxification treatment apparatus provided in the first embodiment of this application, the second embodiment of this application proposes another detoxification treatment apparatus. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0069] Specifically, the detoxification treatment device provided in the second embodiment of this application differs in that the end of the drain pipe 5 is connected to an extraction mechanism 6, the extraction mechanism 6 includes an extraction pipe 601, one end of the extraction pipe 601 is connected to the end of the drain pipe 5, the other end of the extraction pipe 601 is connected to an extraction pump 602, the extraction pump 602 is disposed on the ground, and the output end of the extraction pump 602 is connected to a connecting pipe 603.

[0070] The top end of the connecting pipe 603 is connected to a plate and frame filter press 7. A lithium slag box 13 is provided at the bottom of the plate and frame filter press 7. A waste liquid box 14 is provided at the outlet end of the plate and frame filter press 7. Both the lithium slag box 13 and the waste liquid box 14 are located on the ground.

[0071] A stirring mechanism 8 is fixedly installed on the top of the inner wall of the reactor 1. The stirring mechanism 8 includes a stirring motor 801, which is fixedly installed on the top of the inner wall of the reactor 1. The output shaft of the stirring motor 801 is fixedly connected to a stirring shaft 802, and a plurality of stirring blades 803 are fixedly installed on the surface of the stirring shaft 802 by a fixing ring.

[0072] An electromagnet controller 11 is fixedly mounted on the surface of the output shaft of the stirring motor 801. The outer wall of the electromagnet controller 11 is fixedly mounted on the inner wall of the reactor 1 by four magnetic strips 12. Four side wall scrapers 10 are fixedly mounted on one end of each of the stirring blades 803. The four side wall scrapers 10 are adapted to the inner wall of the reactor 1.

[0073] A scraper mechanism 9 is provided between each pair of magnetic strips 12. There are four scraper mechanisms 9. Each scraper mechanism 9 includes a first magnetic plate 901 and a second magnetic plate 905. The first magnetic plate 901 and the second magnetic plate 905 are attracted to the two magnetic strips 12 respectively. A first scraper 902 is fixedly installed at the bottom of the first magnetic plate 901. A second scraper 904 is fixedly connected to one side of the first scraper 902 through a connecting plate 903. The top of the second scraper 904 is fixedly installed to the bottom of the second magnetic plate 905. A float ball 906 is fixedly installed at the bottom of the connecting plate 903 through a support column. The first scraper 902 and the second scraper 904 are adapted to be installed with the stirring blade 803.

[0074] In actual use, the magnetic strip 12 is attracted to the first magnetic plate 901 and the second magnetic plate 905; the electromagnet controller 11 drives the cutting coil to generate current through the stirring motor 801, so that the magnetic strip 12 is energized and generates magnetic force; the magnetic strip 12 is an electromagnet.

[0075] The working principle of the detoxification treatment device provided in this embodiment is as follows:

[0076] First, when deionized water and After being added to the interior of the reactor 1, the stirring motor 801 is started and the stirring blades 803 are driven to work through the stirring shaft 802. Several stirring blades 803 continuously stir the mixed slurry inside the reactor 1. The stirring blades 803 drive the side wall scraper 10 to scrape off the slurry on the inner wall of the reactor 1 to achieve mixing without dead corners, while avoiding splashed slurry from adhering to the inner wall.

[0077] Then, as the stirring shaft 802 continues to mix, the rotation of the stirring shaft 802 drives the electromagnet controller 11 to generate current to continuously attract the first magnetic plate 901 and the second magnetic plate 905 to the magnetic strip 12. When the mixing is completed, the electromagnet controller 11 stops supplying power to the magnetic strip 12. As a result, the first magnetic plate 901 and the second magnetic plate 905 move downward under gravity. The float 906 contacts the surface of the mixed slurry. The first scraper 902 and the second scraper 904 scrape off the mixed slurry attached to the stirring blades 803. During the process of the extraction pump 602 extracting the mixed slurry, the liquid level of the mixed slurry gradually decreases. The float 906 drives the first scraper 902 and the second scraper 904 to gradually decrease with the liquid level, scraping off all the stirring blades 803. At the same time, as the float 906 falls, the first magnetic plate 901 and the second magnetic plate 905 clamp the previous set of stirring blades 803 to limit the movement, ensuring that the first scraper 902 and the second scraper 904 fall vertically during the falling process.

[0078] Then, after all the mixed slurry is extracted, the float 906 also falls to the bottom, completing the extraction of the mixed slurry while cleaning all the stirring blades 803. During the next detoxification process, the float 906 drives the first scraper 902 and the second scraper 904 to rise and reach the magnetic strip 12. The float 906 detaches from the stirring blades 803, and the stirring motor 801 is restarted to supply power to the magnetic strip 12 through the electromagnet controller 11 to complete the adsorption.

[0079] Finally, the mixed slurry is extracted by the extraction pump 602 and the extraction pipe 601, and then enters the plate and frame filter press 7 through the connecting pipe 603. After solid-liquid separation by the plate and frame filter press 7, detoxified and pre-activated lithium slag is obtained. The detoxified and pre-activated lithium slag is recovered through the lithium slag box 13, and the waste liquid is recovered and transferred through the waste liquid box 14.

[0080] Compared with related technologies, the detoxification treatment device provided in this embodiment has the following beneficial effects:

[0081] The stirring blade 803, in conjunction with the side wall scraper 10, simultaneously scrapes away the adhering material on the inner wall during the stirring process, ensuring the removal of lithium slag, deionized water, and other contaminants during the reaction. Comprehensive and uniform contact is achieved, avoiding uneven concentrations or dead zones, thus improving the detoxification reaction rate and thoroughness. A stirring motor 801 drives an electromagnet controller 11 to magnetically attract the first magnetic plate 901 and the second magnetic plate 905 onto the magnetic strip 12. A float 906 lowers the liquid level, causing the first scraper 902 and the second scraper 904 to scrape away the slurry adhering to the stirring blades 803. This achieves simultaneous and automatic cleaning of the stirring blades 803 during the discharge process, significantly improving equipment utilization and avoiding downtime. The float 906, as the liquid level decreases, moves the first scraper 902 and the second scraper 904 downwards, ensuring they remain in constant contact with the surface of the stirring blades 803. Simultaneously, the first magnetic plate 901 and the second magnetic plate 905 are positioned to maintain their position. The first scraper 902 and the second scraper 904 move vertically to avoid jamming and cleaning omissions. The magnetic strip 12 powered by the electromagnet controller 11 only adsorbs the scraper mechanism 9 during stirring. The power comes from the kinetic energy of the stirring shaft 802. The energy-saving system automatically starts and stops. After each detoxification, the stirring blades 803 are automatically scraped clean to prevent residual slurry from drying and scaling, which would affect the next batch of detoxification reaction and ensure product consistency. At the same time, it reduces the accumulation of hard scale and extends the service life. Solid-liquid separation is achieved through the plate and frame filter press 7 to obtain detoxified and pre-activated lithium slag. The cleaning action is linked to the discharge liquid level. The cleaning is completed when the discharge is finished. During the next operation, the float 906 automatically resets as the liquid level rises and the magnetic force is re-fixed, achieving automatic reset without human intervention.

[0082] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing a lithium sulfate-resistant slag-based cementitious material, characterized in that, Includes the following steps: S1: Lithium smelting slag does not need to be dried. Add deionized water directly at a liquid-to-solid ratio of 1:2-1:3, and add water at a mass ratio of 0.05-0.1% of the lithium slag. After stirring at room temperature for 1 hour in a reactor, the detoxified and pre-activated lithium slag was obtained by solid-liquid separation by plate and frame filter press. S2: Dry lithium slag, blast furnace granulated slag and silicate clinker to a moisture content of <0.5%, and then grind them to form a particle size distribution; S3: Grinded lithium slag powder, slag powder, clinker powder, fly ash, gypsum, quicklime, and aluminum-based additives are thoroughly mixed and homogenized in a certain proportion to obtain lithium slag-based sulfate-resistant cementitious material.

2. The method for preparing a lithium sulfate-resistant slag-based cementitious material according to claim 1, characterized in that, In S3, the proportions of each raw material in the lithium slag-based sulfate-resistant cementitious material are as follows: 20%-40% lithium slag powder, 25%-45% slag powder, 5%-15% clinker powder, 1%-8% fly ash, 5%-10% gypsum, 5%-10% quicklime, and 0.1%-3% aluminum additives.

3. The method for preparing a lithium sulfate-resistant slag-based cementitious material according to claim 1, characterized in that, In step S1, the toxic elements such as fluorine, beryllium, and thallium in the lithium slag can be significantly reduced in toxicity after detoxification treatment. The solution is alkaline, and during the detoxification process of the lithium slag, the Al-O bonds can be opened, enhancing the hydration activity of the lithium slag. In step S2, the specific surface area of ​​the lithium slag is ground to 500-700 m². 2 / kg, the specific surface area of ​​granulated blast furnace slag is ground to 600-800m² 2 / kg, the specific surface area of ​​silicate clinker is ground to 300-500m² 2 / kg.

4. A detoxification treatment device, requiring the use of a preparation method for a lithium sulfate-resistant slag-based cementitious material as described in any one of claims 1-3, characterized in that, Includes: a reaction vessel, the top of which is connected to a feed inlet, and the bottom of which is connected to a drain pipe; A spiral feeding mechanism is provided, which is connected to the top of the reactor. The spiral feeding mechanism includes a spiral feeding box and a discharge funnel. The discharge funnel is connected to the top of the reactor. The spiral feeding box is mounted on the ground via a bracket. Two spiral feeders are rotatably mounted on the inner wall of the spiral feeding box. The two spiral feeders are fitted together. One end of each spiral feeder is fixedly mounted with an extension shaft. One end of each extension shaft passes through the inner wall of the spiral feeding box and extends to the outside. The two extension shafts are connected by a belt drive. One end of one of the extension shafts is fixedly connected to a feeding motor. The feeding motor is fixedly mounted on one side of the spiral feeding box via a support plate. The top of the spiral feeding box is connected to the inlet funnel, and the bottom of the spiral feeding box is connected to the top of the reactor via the discharge funnel. A deionized water supply mechanism is provided for supplying deionized water to the reactor.

5. The detoxification treatment device according to claim 4, characterized in that, The deionized water mechanism is connected to the top of the reactor. The deionized water mechanism includes a deionized water pipe and a deionized water tank. The deionized water pipe is connected to the top of the reactor, and the deionized water tank is located on the ground. A deionized water pump is fixedly installed on the top of the deionized water tank. The end of the deionized water pipe is connected to the outlet of the deionized water pump, and the pumping end of the deionized water pump is connected to the inside of the deionized water tank through a pumping pipe.

6. The detoxification treatment device according to claim 4, characterized in that, The drain pipe is connected to a pumping mechanism at its end. The pumping mechanism includes a pumping pipe, one end of which is connected to the end of the drain pipe, and the other end of which is connected to a pumping pump. The pumping pump is located on the ground, and the output end of the pumping pump is connected to a connecting pipe.

7. The detoxification treatment device according to claim 6, characterized in that, The top of the connecting pipe is connected to a plate and frame filter press, the bottom of the plate and frame filter press is equipped with a lithium slag box, and the outlet end of the plate and frame filter press is equipped with a waste liquid box. Both the lithium slag box and the waste liquid box are located on the ground.

8. The detoxification treatment device according to claim 4, characterized in that, A stirring mechanism is fixedly installed on the top of the inner wall of the reactor. The stirring mechanism includes a stirring motor, which is fixedly installed on the top of the inner wall of the reactor. The output shaft of the stirring motor is fixedly connected to a stirring shaft, and several stirring blades are fixedly installed on the surface of the stirring shaft by a fixing ring.

9. The detoxification treatment device according to claim 8, characterized in that, An electromagnet controller is fixedly mounted on the surface of the output shaft of the stirring motor. The outer wall of the electromagnet controller is fixedly mounted to the inner wall of the reactor by four magnetic strips. Four side wall scrapers are fixedly mounted on one end of each of the stirring blades. The four side wall scrapers are adapted to the inner wall of the reactor.

10. A detoxification treatment device according to claim 9, characterized in that, A scraper mechanism is provided between each pair of magnetic strips. There are four scraper mechanisms, each including a first magnetic plate and a second magnetic plate. The first magnetic plate and the second magnetic plate are attracted to the two magnetic strips respectively. A first scraper is fixedly installed at the bottom of the first magnetic plate. A second scraper is fixedly connected to one side of the first scraper through a connecting plate. The top of the second scraper is fixedly installed to the bottom of the second magnetic plate. A float ball is fixedly installed at the bottom of the connecting plate through a support column. The first scraper and the second scraper are adapted to the stirring blade.

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