Lithium extraction process from impurity removal plate frame slag of spodumene and lithium extraction equipment

Abstract

The application provides a lithium extraction process from lithium aluminosilicate impurity removal plate frame slag and a lithium extraction device, and relates to the field of metal material recycling. The lithium extraction process from lithium aluminosilicate impurity removal plate frame slag comprises the following steps: S1, drying and ball milling: a predetermined amount of impurity removal plate frame slag with a predetermined moisture content is placed in an oven for drying at 80-100 DEG C for 12 hours, and the dried impurity removal plate frame slag is placed in a ball mill for grinding treatment; S2, water leaching of lithium: a predetermined amount of ground impurity removal plate frame slag is weighed, and a predetermined amount of deionized water is added. The lithium extraction process from lithium aluminosilicate impurity removal plate frame slag provided by the application can reduce the lithium content in the lithium aluminosilicate impurity removal plate frame slag from 5.8% to below 0.4% by using the dispersant sodium polyacrylate selected by the application and the optimized process steps. The lithium extraction efficiency is as high as 93% or more, which is much higher than the efficiency of the traditional lithium extraction process, and can provide reliable protection for the sustainable and high-value utilization of lithium resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metal material recycling, in particular to a lithium extraction process from lithium feldspar impurity removal frame slag and a lithium extraction equipment. BACKGROUND

[0002] Lithium feldspar impurity removal frame slag is an industrial waste produced in the process of preparing lithium carbonate from lithium feldspar ore. In the process of purifying and removing impurities (Mg 2+ , Ca 2+ , etc.), the filter residue formed after filtration is screened to form impurity removal frame slag. It is rich in high-value lithium (Li + ), and about 8-12 t of frame slag is produced per ton of battery-grade lithium carbonate. Under the dual background of high lithium price and strict environmental protection, lithium feldspar impurity removal frame slag has changed from "solid waste" to "urban mine" key raw material. However, it is inevitable that magnesium (Mg 2+ ), calcium (Ca 2+ ) and anions (OH - , CO3 2- , SO4 2- ) also exist in lithium feldspar impurity removal frame slag. Direct water immersion can easily lead to co-leaching of impurities, reducing the recovery rate of lithium.

[0003] In the prior art, the existing lithium extraction technology for frame slag has certain limitations. The back-solution-lithium precipitation method uses 15-25 % dilute sulfuric acid to back-solubilize the frame slag at 60-80 ℃, and the filtrate is directly returned to the lithium precipitation section of the main system. The process is short in time but can only recover the soluble lithium in the slag, still leaving 0.15-0.25 % Li2O, and the treatment effect is poor.

[0004] The acid circulation-membrane separation method first removes Ca and Mg using acid-resistant nanofiltration membrane (NF), and then MVR concentrates and precipitates lithium. This method has high Ca and Mg removal rate, but the use cost of the membrane system is about 1.2-1.5 million yuan·t -1 slag).

[0005] The low-temperature alkali activation-acid leaching method activates the slag with a small amount of NaOH (3-5 %) at 120-150 ℃ for 30-60 min, and then leaches it with dilute acid. This method can destroy the gypsum lattice and release the wrapped lithium, but it will introduce sodium salt, and the mother liquor needs to be evaporated to remove sodium, increasing the salt treatment cost.

[0006] Therefore, it is necessary to provide a lithium extraction process from lithium feldspar impurity removal frame slag and a lithium extraction equipment to solve the above technical problems. SUMMARY

[0007] The application provides a lithium extraction process from impurity-removed plate frame slag of spodumene, and solves the problems of excessive residue after lithium extraction and introduction of new impurities in the prior art lithium extraction process from impurity-removed plate frame slag of spodumene.

[0008] To solve the above technical problems, the lithium extraction process from impurity-removed plate frame slag of spodumene provided by the application comprises the following steps:

[0009] S1, dry ball milling: a predetermined amount of wet impurity-removed plate frame slag is weighed and placed in an oven for drying at 80-100 DEG C for 12 hours, and the dried impurity-removed plate frame slag is ground in a ball mill;

[0010] S2, water leaching of lithium: a predetermined amount of ground impurity-removed plate frame slag is weighed, a predetermined amount of deionized water is added, and the mixture is uniformly mixed, then 0.5-2% of sodium polyacrylate is added according to the mass ratio, and the reaction is continued for 50 minutes, after the reaction, a first washing solution and a first washing residue are obtained by filtration; the first washing residue is subjected to the same operation to obtain a second washing solution and a second washing residue, and the second washing residue is subjected to the same operation to obtain a third washing solution and a third washing residue;

[0011] S3, purification and impurity removal: a predetermined amount of the third washing solution is heated to 68-70 DEG C in a water bath, a predetermined amount of sodium hydroxide is added, the pH of the solution is adjusted to 11.5-12.5, and the solution is stirred and kept for 20 minutes, then a predetermined amount of sodium carbonate is added, the solution is stirred and kept for 40 minutes, after the reaction, a purified solution and a filter residue are obtained by filtration, and the purified solution is subjected to ion exchange resin to obtain a resin qualified solution;

[0012] S4, evaporation and concentration: the resin qualified solution is subjected to evaporation and concentration, and the lithium content is controlled to be 20-50 g / L, after the concentration is completed, a pre-lithium precipitation solution is obtained;

[0013] S5, alkali solution lithium precipitation: a saturated sodium phosphate alkali solution of a predetermined concentration is prepared, and the saturated sodium phosphate alkali solution and the pre-lithium precipitation solution are both heated and stirred in a water bath; the pre-lithium precipitation solution is slowly added to the saturated sodium phosphate alkali solution by using a peristaltic pump, after the pre-lithium precipitation solution is added, the stirring is continued for 45 minutes; then the solution after lithium precipitation is filtered while hot, and the lithium precipitation crude lithium and the lithium precipitation waste solution are separated;

[0014] S6, washing and drying: the lithium precipitation crude lithium is taken, pure water is added according to a predetermined solid-liquid ratio for stirring and cleaning, the solution is heated to a predetermined temperature, and after stirring for 10-20 minutes, the solution is filtered while hot, the operation is repeated three times, the lithium phosphate is obtained by weighing and placing in an oven for drying at 200-300 DEG C.

[0015] Preferably, in S1, the dried impurity-removed plate frame slag is ground in the ball mill for not less than 6 minutes.

[0016] The application also provides a device for lithium extraction from impurity-removed plate frame slag of spodumene, which is used in the lithium extraction process from impurity-removed plate frame slag of spodumene and comprises:

[0017] A support frame;

[0018] A reaction cylinder, which comprises a cylinder body, an annular cover and a heater, the cylinder body is mounted on the support frame, the annular cover is mounted outside the cylinder body and forms a heating cavity with the cylinder body, the heater is mounted on the annular cover and the output end of the heater is located in the heating cavity, and a liquid supplement pipe is connected to the annular cover;

[0019] A mixing assembly for stirring the material in the reaction cylinder;

[0020] A liquid discharge pipe, which is connected to the liquid outlet pipe at the bottom end of the cylinder body, and a filter structure is mounted in the liquid discharge pipe;

[0021] A collection structure, which comprises a collection cylinder, the collection cylinder is detachably mounted at the bottom end of the liquid outlet pipe through a connecting piece;

[0022] A valve, which comprises a lifting cylinder and a valve plate, the lifting cylinder is mounted at the bottom of the collection cylinder, and the valve plate is mounted at the output end of the lifting cylinder and seals the bottom end of the cylinder body.

[0023] Preferably, the mixing assembly comprises a lifting cylinder, a lifting frame and a stirring device, the lifting cylinder is mounted on the support frame, one end of the lifting frame is mounted at the output end of the lifting cylinder, and the other end is suspended above the cylinder body, and the stirring device is mounted on the lifting frame.

[0024] Preferably, the mixing assembly further comprises a plurality of slide rods, and the slide rods are mounted on the support frame at intervals, and one end of the lifting frame is sleeved on the slide rods.

[0025] Preferably, the connecting piece comprises a connecting cover and a locking plate, the connecting cover is sleeved and mounted at the bottom end of the liquid outlet pipe, the locking plate is mounted at the bottom end of the connecting cover, and a plurality of insertion holes are formed in the bottom of the connecting cover.

[0026] The collection structure further comprises a locking structure and a plurality of supporting blocks, the supporting blocks are mounted at intervals on the top of the collection cylinder and located in the connecting cover, the locking structure is mounted on the collection cylinder, and the locking structure is clamped with the clamping hole on the locking plate.

[0027] Preferably, the locking structure comprises a mounting shell, a connecting rod, a clamping shaft, an elastic member and a driving frame, the mounting shell is mounted in the inside of the collection cylinder, one end of the clamping shaft is slidably connected in the mounting shell and connected with the mounting shell through the elastic member, the other end sequentially penetrates the mounting shell, the collection cylinder and the clamping hole, and the driving frame is connected with the clamping shaft through the connecting rod.

[0028] The valve further comprises a pushing block, the pushing block is installed at the bottom of the valve plate, the bottom of the pushing block is provided as an inclined surface and is aligned with the end of the driving frame away from the connecting rod.

[0029] Preferably, the filtering structure comprises a driving member, a mounting ring, a rotating shaft and a filter screen, the mounting ring is rotatably installed inside the liquid discharge pipe through the rotating shaft, the filter screen is installed in the mounting ring, and the driving member is used to drive the rotating shaft to rotate.

[0030] Preferably, the driving member is a one-way gear, the one-way gear is installed on the rotating shaft and located outside the liquid discharge pipe, a toothed plate is installed on the collecting cylinder, and the toothed plate is provided at a preset angle with the driving member.

[0031] Preferably, two limiting grooves are symmetrically formed at the top and bottom of the mounting ring, the valve further comprises a limiting arm, the limiting arm is installed on one side of the valve plate, the bottom end of the limiting arm sequentially penetrates through the two limiting grooves, and the top end of the limiting arm is embedded with the bottom of the inner wall of the cylinder.

[0032] Compared with the related art, the process for extracting lithium from the impurity-removed plate frame slag of spodumene has the following beneficial effects:

[0033] The application provides a process for extracting lithium from impurity-removed plate frame slag of spodumene and an equipment for extracting lithium,

[0034] By adopting the dispersant sodium polyacrylate and the optimized process steps, the process for extracting lithium can reduce the lithium content in the impurity-removed plate frame slag of spodumene from 5.8% to below 0.4%, and the extraction efficiency is as high as 93% or above, which is much higher than the efficiency of the traditional extraction process, and can provide reliable guarantee for the sustainable and high-value utilization of lithium resources.

[0035] The dispersant sodium polyacrylate is a common and relatively inexpensive chemical reagent, which is widely available and has controllable comprehensive cost, and no expensive equipment and frequent replacement of consumables are needed in the whole process, so that the use cost of equipment is reduced compared with the traditional extraction process, thereby effectively reducing the extraction cost.

[0036] Environment-friendly: the dispersant used in the process for extracting lithium of the application does not cause additional burden to the environment, and no other harmful substances that cause adverse effects on the environment are introduced in the whole process, which meets the development concept of green environmental protection.

[0037] High adaptability: In view of the complex composition of spodumene impurity removal plate and frame slag, the process of this invention can effectively reduce the interference of other metal ions and impurities in the slag on the lithium extraction effect through pretreatment drying and fine grinding, as well as the synergistic effect of dispersant and various components in the water leaching lithium extraction stage. It has good adaptability to spodumene impurity removal plate and frame slag from different sources and with different compositions, and can ensure the stability and reliability of the process. Attached Figure Description

[0038] Figure 1 This is a flowchart of the process for extracting lithium from spodumene impurity removal plate frame slag provided by the present invention.

[0039] Figure 2 This is a schematic diagram of the equipment for extracting lithium from spodumene impurity plate frame slag provided by the present invention;

[0040] Figure 3 This is a partial cross-sectional view of the equipment for extracting lithium from spodumene impurity plate frame slag provided by the present invention;

[0041] Figure 4 This is a partial bottom view of the equipment for extracting lithium from spodumene impurity removal plate frame slag provided by the present invention;

[0042] Figure 5 for Figure 3 The enlarged schematic diagram of part A shown below;

[0043] Figure 6 This is a schematic diagram showing the assembly state of the collection tube and the connecting cover provided by the present invention, wherein... Figure 6 (a) is a schematic diagram showing that the top support block of the collecting cylinder is misaligned with the slot of the connecting cover. Figure 6 (b) is a schematic diagram showing the alignment of the top support block of the collection cylinder with the slot of the connecting cover;

[0044] Figure 7 for Figure 3 The enlarged schematic diagram of section B is shown below;

[0045] Figure 8 This is a partial schematic diagram of the filter structure provided by the present invention;

[0046] Figure 9 This is a schematic diagram of the working state of the equipment for extracting lithium from spodumene impurity plate frame slag provided by the present invention, wherein... Figure 9 Image (a) shows a schematic diagram of the valve plate descending to the bottom of the filter structure for filtration. Figure 9 (b) is a schematic diagram showing the state in which the valve plate drives the crude lithium to descend into the collection cylinder;

[0047] Figure 10 This is a schematic diagram showing the assembly state of the collection tube and the connecting cover provided by the present invention, wherein... Figure 10 Image (a) is a schematic diagram of the assembly of the collecting cylinder and the connecting cover.Figure 10 Fig. 3 is a schematic view of the separation of the collecting cylinder from the connecting cover.

[0048] Reference numerals in the drawings:

[0049] 1, support;

[0050] 2, reaction cylinder; 21, cylinder body; 22, annular cover; 23, heater; 201, liquid outlet pipe;

[0051] 3, mixing assembly; 31, lifting cylinder; 32, lifting frame; 33, stirring device; 34, sliding rod; 331, motor; 332, stirring rod; 333, stirring blade;

[0052] 4, collecting structure; 41, collecting cylinder; 42, supporting block; 43, clamping structure;

[0053] 431, mounting shell; 432, connecting rod; 433, clamping shaft; 434, elastic member; 435, driving frame;

[0054] 5, connecting piece; 51, connecting cover; 52, clamping plate; 511, insertion hole; 521, clamping hole;

[0055] 6, valve; 61, lifting cylinder; 62, valve plate; 63, pushing block; 64, limiting arm;

[0056] 7, liquid discharge pipe;

[0057] 8, filtering structure; 81, driving member; 82, mounting ring; 83, filter screen; 84, rotating shaft; 821, limiting groove;

[0058] 9, toothed plate. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0060] The present application provides a process for extracting lithium from impurity-removed plate frame slag of spodumene.

[0061] Please refer to Figure 1 In an embodiment of the present application, the process for extracting lithium from impurity-removed plate frame slag of spodumene comprises the following steps:

[0062] S1, dry ball milling: a predetermined amount of wet impurity-removed plate frame slag is placed in an oven at 80-100°C for drying for 12 hours, and the dried impurity-removed plate frame slag is ground in a ball mill.

[0063] S2, water leaching lithium: a predetermined amount of ground impurity removal plate frame slag is taken, a predetermined amount of deionized water is added, and it is mixed uniformly, then 0.5-2% of sodium polyacrylate is added according to the mass ratio and the reaction is continued for 50 min, after the reaction is completed, a washing liquid and a washing residue are obtained by filtering; the washing residue is operated in the same way to obtain a second washing liquid and a second washing residue, and the second washing residue is operated in the same way to obtain a third washing liquid and a third washing residue;

[0064] S3, purification and impurity removal: a predetermined amount of the third washing liquid is heated to 68-70 DEG C in a water bath, a predetermined amount of sodium hydroxide is added, the pH of the solution is adjusted to 11.5-12.5, and stirring and heat preservation are carried out for 20 min, then a predetermined amount of sodium carbonate is added, stirring and heat preservation are carried out for 40 min, after the reaction is completed, a purified liquid and a filter residue are obtained by filtering, and the purified liquid is passed through an ion exchange resin to obtain a resin qualified liquid;

[0065] S4, evaporation and concentration: the resin qualified liquid is evaporated and concentrated, the lithium content is controlled to be 20-50 g / L, and after the concentration is completed, a pre-lithium precipitation liquid is obtained;

[0066] S5, alkali lithium precipitation: a saturated sodium phosphate alkali solution of a predetermined concentration is prepared, and the saturated sodium phosphate alkali solution and the pre-lithium precipitation liquid are heated and stirred in a water bath; the pre-lithium precipitation liquid is slowly added to the saturated sodium phosphate alkali solution using a peristaltic pump, after the pre-lithium precipitation liquid is added, stirring is continued for 45 min; then the post-lithium precipitation solution is filtered while hot, and the post-lithium precipitation crude lithium and the post-lithium precipitation waste liquid are separated;

[0067] S6, washing and drying: the post-lithium precipitation crude lithium is taken, pure water is added according to a predetermined solid-liquid ratio, stirring and cleaning are carried out, heating is carried out to a predetermined temperature, after stirring for 10-20 min, hot filtration is carried out, the operation is repeated three times, after weighing, the post-lithium precipitation crude lithium is placed in an oven for drying at 200-300 DEG C, and lithium phosphate is prepared.

[0068] In S1, the dried impurity removal plate frame slag is ground in a ball mill for not less than 6 min.

[0069] By adopting the dispersant sodium polyacrylate and the optimized process steps, the lithium extraction process can reduce the lithium content in the lithium spodumene impurity removal plate frame slag from 5.8% to below 0.4%, and the lithium extraction efficiency is as high as 93% or more, which is much higher than the efficiency of the traditional lithium extraction process, and can provide reliable protection for the sustainable and high-value utilization of lithium resources;

[0070] The dispersant sodium polyacrylate is a common and relatively low-cost chemical reagent, which is widely available and has controllable comprehensive cost, and the entire process does not require the use of expensive equipment and frequent replacement of consumables, compared with the traditional lithium extraction process, the use cost of equipment is reduced, thereby effectively reducing the lithium extraction cost;

[0071] Environment-friendly: the lithium extraction process of the application does not cause additional burden to the environment during the reaction process, and no other harmful substances that will adversely affect the environment are introduced during the entire process, which meets the development concept of green environmental protection.

[0072] Strong adaptability: in view of the complex composition of the lithium aluminosilicate deslagging frame slag, the process of the application can effectively reduce the interference of other metal ions and impurities in the slag on the lithium extraction effect through pretreatment drying, fine grinding, and the synergistic effect of dispersants and various components in the water leaching lithium stage, and has good adaptability to lithium aluminosilicate deslagging frame slags of different sources and compositions, which can ensure the stability and reliability of the process.

[0073] The lithium extraction process from lithium aluminosilicate deslagging frame slag specifically includes the following embodiments: Example 1:

[0074] Pretreatment: take 200 g of lithium aluminosilicate deslagging frame slag (wet slag contains water), dry the wet slag in an oven at 80℃ for 12h, cool it down, and then grind it in a ball mill for 6 min;

[0075] Water leaching lithium: (1) one washing and filtering, take 40 g of deslagging frame slag, add 250 mL of deionized water, ultrasonic for 10 min, then add 0.2 g of polyacrylic acid sodium and continue to react for 50 min, the solution pH is 11.5, after the reaction is completed, filter to obtain one washing solution and one washing residue; (2) two washing and filtering, take 35 g of one washing residue, add 220 mL of deionized water, ultrasonic for 10 min, then add 0.175 g of polyacrylic acid sodium and continue to react for 30 min, the solution pH is 11.8, after the reaction is completed, filter to obtain two washing solution and two washing residue; (3) three washing and filtering, take 26.25 g of two washing residue, add 160 mL of deionized water, ultrasonic for 10 min, then add 0.1313 g of polyacrylic acid sodium and continue to react for 20 min, the solution pH is 11.9, after the reaction is completed, filter to obtain three washing solution and three washing residue;

[0076] Purification and impurity removal: take 150 mL of three washing solution, heat it to 68℃ in a water bath, add 0.5 g of sodium hydroxide, stir and keep warm for 20 min, then take a uniform sample without filtration, add 0.37 g of sodium carbonate, stir and keep warm for 40 min, after the stirring is completed, filter to obtain a purified solution and a filter residue, pass the purified solution through an ion exchange resin, and after the purified solution is completely passed through the resin, take a sample of the qualified liquid from the resin and send it for inspection;

[0077] Concentration: evaporate and concentrate the qualified liquid, control the lithium content to be about 35 g / L; after the concentration is completed, obtain a pre-lithium precipitation solution;

[0078] Lithium precipitation: After preparing saturated sodium phosphate lye, heat the lye and the pre-lithium precipitation solution to above 95°C in a water bath, and start stirring when the temperature reaches the set point; slowly add the pre-lithium precipitation solution into the saturated sodium phosphate lye using a peristaltic pump; after the pre-lithium precipitation solution is added, continue stirring for 45 min. After stirring, filter the post-lithium precipitation solution while it is still hot, separate the crude lithium and the post-lithium precipitation waste liquid; take an appropriate amount of crude lithium, add pure water and stir to clean, heat to about 95°C, and stir for 15 min; after stirring, filter while it is still hot, repeat three times, and dry the wet lithium in an oven at 260°C to obtain lithium phosphate.

[0079] Detection and adjustment: The lithium extraction process can reduce the lithium content in the lithium spodumene impurity removal frame slag from 5.8% to below 0.4%, with an extraction efficiency of above 93%, meeting the expected standard.

[0080] Example Two:

[0081] Pretreatment: Take 180 g of lithium spodumene impurity removal frame slag (wet slag contains water), dry the wet slag in an oven at 80°C for 12 h, cool it, and then grind it in a ball mill for 8 min;

[0082] Water leaching of lithium: (1) First washing and filtration: take 50 g of impurity removal frame slag, add 300 mL of deionized water, ultrasonic for 10 min, then add 0.25 g of sodium polyacrylate and continue to react for 50 min, the solution pH is 11.4, after the reaction is completed, filter to obtain the first washing solution and the first washing residue; (2) Second washing and filtration: take 43.75 g of the first washing residue, add 260 mL of deionized water, ultrasonic for 10 min, then add 0.22 g of sodium polyacrylate and continue to react for 30 min, the solution pH is 11.6, after the reaction is completed, filter to obtain the second washing solution and the second washing residue; (3) Third washing and filtration: take 38.35 g of the second washing residue, add 230 mL of deionized water, ultrasonic for 10 min, then add 0.19 g of sodium polyacrylate and continue to react for 20 min, the solution pH is 11.8, after the reaction is completed, filter to obtain the third washing solution and the third washing residue;

[0083] Purification and impurity removal: take 200 mL of the third washing solution, heat to 68°C in a water bath, add 0.6 g of sodium hydroxide, stir and keep warm for 20 min, take a uniform sample without filtration, then add 0.45 g of sodium carbonate, stir and keep warm for 40 min, after stirring is completed, filter to obtain the purified solution and the filter residue, pass the purified solution through ion exchange resin, take a sample of the resin-qualified solution for detection;

[0084] Concentration: evaporate and concentrate the qualified solution, control the lithium content to be about 40 g / L, after concentration is completed, obtain the pre-lithium precipitation solution;

[0085] Lithium precipitation: after preparing saturated sodium phosphate lye, the lye and the lithium precipitation pre-liquid are heated to above 95 DEG C in water bath, and the stirring is started when the temperature reaches; the lithium precipitation pre-liquid is slowly added into the saturated sodium phosphate lye by using a peristaltic pump; after the lithium precipitation pre-liquid is added, the stirring is continued for 45 min; after the stirring is completed, the lithium precipitation post-solution is filtered while hot, and the lithium precipitation crude lithium and the lithium precipitation waste liquid are separated; the lithium precipitation crude lithium is taken, pure water is added for stirring and cleaning, and the temperature is heated to about 95 DEG C; after the stirring is completed, the filter is passed while hot, and the process is repeated for three times; the wet lithium is placed into an oven for drying at 260 DEG C, and lithium phosphate is prepared.

[0086] Detection and adjustment: the lithium extraction process can reduce the lithium content in the lithium spodumene impurity removal frame slag from 4.5% to below 0.3%, and the lithium extraction efficiency is as high as 93% or above, reaching the expected standard.

[0087] The application further provides a device for extracting lithium from lithium spodumene impurity removal frame slag.

[0088] Please refer to Figure 2 and Figure 3 , a device for extracting lithium from lithium spodumene impurity removal frame slag, which is used in the lithium extraction process from lithium spodumene impurity removal frame slag and is particularly used in step S5, and comprises:

[0089] a support 1;

[0090] a reaction cylinder 2, which comprises a cylinder body 21, an annular cover 22 and a heater 23; the cylinder body 21 is installed on the support 1; the annular cover 22 is installed outside the cylinder body 21 and forms a heating cavity with the cylinder body 21; the heater 23 is installed on the annular cover 22, and the output end of the heater 23 is located in the heating cavity; and a liquid supplementing pipe is connected to the annular cover 22;

[0091] a mixing assembly 3, which is used for stirring the material in the reaction cylinder 2;

[0092] a liquid discharging pipe 7, which is connected to a liquid outlet pipe 201 at the bottom end of the cylinder body 21, and the inside of the liquid discharging pipe 7 is installed with a filter structure 8;

[0093] a collecting structure 4, which comprises a collecting cylinder 41, and the collecting cylinder 41 is detachably installed at the bottom end of the liquid outlet pipe 201 through a connecting piece 5;

[0094] a valve piece 6, which comprises a lifting cylinder 61 and a valve plate 62; the lifting cylinder 61 is installed at the bottom of the collecting cylinder 41, and the valve plate 62 is installed at the output end of the lifting cylinder 61 and seals the bottom end of the cylinder body 21.

[0095] The equipment for extracting lithium from the impurity plate frame slag of spodumene in the embodiment is mainly used in the laboratory, wherein the liquid supplementing pipe is connected with a water source through a pipeline to add clean water into the heating cavity, the clean water is heated through the metal heating end of the heater 23 to realize the function of water bath heating; the valve plate 62 blocks the position where the bottom end of the cylinder 21 is connected with the liquid outlet pipe 201, and the blocking position is higher than the liquid discharge pipe 7.

[0096] The saturated sodium phosphate lye and the lithium precipitation liquid are heated and stirred through water bath heating using corresponding equipment, then the lithium precipitation liquid is slowly added into the cylinder 21 containing the saturated sodium phosphate lye through the peristaltic pump, and the stirring is continued for a preset time, when the reaction is completed, the valve plate 62 is lowered by the lifting cylinder 61 to be lower than the liquid discharge pipe 7 when the solid-liquid filtration is performed, at this time, the material in the cylinder 21 is lowered, the lithium precipitation waste liquid is discharged through the liquid discharge pipe 7 after passing through the filtering structure 8, and the lithium precipitation crude lithium is filtered by the filtering structure 8, when the lithium precipitation waste liquid is completely discharged, the valve plate 62 is lifted again by the lifting cylinder 61, and the lithium precipitation crude lithium on the valve plate 62 enters into the cylinder 21 again, then the pure water is added into the cylinder 21, the stirring is performed by the mixing assembly 3, and the temperature is heated to a preset temperature, and the stirring is performed for 10-20 min; the subsequent solid-liquid separation is performed in the same way.

[0097] When the cleaning is completed, the valve plate 62 is lowered by the lifting cylinder 61 to enter into the inside of the collecting cylinder 41, at this time, the lithium precipitation crude lithium enters into the collecting cylinder 41, and the discharging of the crude lithium is completed by disassembling the collecting cylinder 41, which is convenient to use.

[0098] Therefore, the device can realize the functions of water bath heating and mixing reaction, cleaning, solid-liquid separation and collecting and discharging of the crude lithium, which is convenient to use.

[0099] Preferably, the circumferential side of the valve plate 62 is provided with a rubber ring, which is attached to the inner wall of the collecting cylinder 41 and the inner wall bottom end of the cylinder 21 to ensure the sealing performance.

[0100] Preferably, the connection part of the bottom end of the cylinder 21 and the liquid outlet pipe 201 is provided in a circular truncated cone shape, so as to guide the material in the cylinder 21 to the liquid outlet pipe 201.

[0101] In an embodiment, the liquid discharge pipe 7 can be connected with the input end of a water circulation vacuum pump through a pipeline, and the output end of the water circulation vacuum pump is connected with a container, so as to realize the function of suction filtration through the water circulation vacuum pump, and the lithium precipitation waste liquid can be discharged more quickly and completely.

[0102] In another embodiment, a collecting container can be arranged below the liquid discharge pipe 7, and the lithium precipitation waste liquid and the like can flow into the collecting container through the gravity.

[0103] Please refer to Figure 2 and Figure 3In the embodiment, the mixing assembly 3 comprises a lifting cylinder 31, a lifting frame 32 and a stirring device 33. The lifting cylinder 31 is installed on the support 1. One end of the lifting frame 32 is installed on the output end of the lifting cylinder 31, and the other end is suspended above the barrel 21. The stirring device 33 is installed on the lifting frame 32.

[0104] By arranging the lifting cylinder 31, the stirring device 33 can be lifted, so that the stirring device 33 can be lifted to facilitate cleaning of the stirring device 33 and the barrel 21, and during the mixing reaction, the position of the stirring device 33 can be adjusted to stir and mix at different height positions in the barrel 21, thereby improving reaction efficiency and the like.

[0105] In the embodiment, the lifting cylinder 31 and the barrel 21 are arranged adjacent to and parallel to each other.

[0106] In the embodiment, the lifting cylinder 31 and the lifting cylinder 61 can be hydraulic cylinders or air cylinders or electric push cylinders.

[0107] In the embodiment, the stirring device 33 comprises a motor 331, a stirring rod 332 and two stirring blades 333. The motor 331 is installed on the lifting frame 32. The top end of the stirring rod 332 is installed on the output end of the motor 331, and the bottom end extends into the interior of the barrel 21. The two stirring blades 333 are symmetrically installed on the bottom end of the stirring rod 332.

[0108] Of course, in other embodiments, only the stirring device 33 can be arranged. The motor 331 is installed on the support 1 through the mounting plate and is suspended above the barrel 21.

[0109] Please refer to Figure 2 As a preferred way of the embodiment, the mixing assembly 3 further comprises a plurality of slide rods 34. The plurality of slide rods 34 are installed on the support 1 at intervals. One end of the lifting frame 32 is sleeved on the slide rod 34.

[0110] By arranging the slide rod 34, the lifting frame 32 is sleeved on the slide rod 34 to form a sliding connection. The slide rod 34 can limit the lifting frame 32 in the horizontal direction, so that the lifting frame 32 can more stably drive the stirring device 33 to lift.

[0111] The number of slide rods 34 is not less than two. In the embodiment, the number of slide rods 34 is two.

[0112] Please refer to Figure 3 and Figure 4 As an optional way of the embodiment, the connecting piece 5 comprises a connecting cover 51 and a locking plate 52. The connecting cover 51 is sleeved and installed at the bottom end of the liquid outlet pipe 201. The locking plate 52 is installed at the bottom end of the connecting cover. The bottom of the connecting cover 51 is provided with a plurality of insertion holes 511.

[0113] The collecting structure 4 further comprises a locking structure 43 and a plurality of supporting blocks 42, the plurality of supporting blocks 42 are spaced apart and installed on the top of the collecting cylinder 41 and located in the connecting cover 51, and the locking structure 43 is installed on the collecting cylinder 41 and is locked with the clamping hole 521 on the locking plate 52.

[0114] The spacing between the bottom of the connecting cover 51 and the liquid outlet pipe 201 is not less than the thickness of the wall of the collecting cylinder 41.

[0115] When the collecting cylinder 41 needs to be separated from the liquid outlet pipe 201, first, the locking structure 43 is unlocked from the clamping hole 521 on the locking plate 52, then the collecting cylinder 41 is rotated clockwise by a preset angle, the supporting block 42 is aligned with the insertion hole 511, as shown in Figure 6 (b), then the collecting cylinder 41 can be moved downward, so that the top end of the collecting cylinder 41 is separated from the connecting cover 51, and then the worker can take out the collecting cylinder 41.

[0116] When the collecting cylinder 41 needs to be separated from the liquid outlet pipe 201, first, the locking structure 43 is unlocked from the clamping hole 521 on the locking plate 52, then the collecting cylinder 41 is rotated clockwise by a preset angle, the supporting block 42 is aligned with the insertion hole 511, as shown in Figure 6 (a), the collecting cylinder 41 is supported by the supporting block 42 and the connecting cover 51, and the locking structure 43 is aligned with the clamping hole 521 on the locking plate 52, then the locking structure 43 is locked with the clamping hole 521 on the locking plate 52, so as to realize the connection of the collecting cylinder 41.

[0117] The number of supporting blocks 42 is not less than two, and in this embodiment, the number is four, and the insertion hole 511 is correspondingly provided with the number of supporting blocks 42.

[0118] The top of the collecting cylinder 41 or the bottom of the liquid outlet pipe 201 is provided with a sealing ring, so as to ensure the sealing of the connection between the liquid outlet pipe 201 and the collecting cylinder 41.

[0119] As another optional way of this embodiment, the connecting part 5 comprises a connecting cover 51 and a plurality of bolts, the connecting cover 51 is sleeved and installed on the liquid outlet pipe 201, and a plurality of mounting holes are formed on the connecting cover 51; a plurality of nuts are provided on the top of the side wall of the collecting cylinder 41, and the bolts are threadedly connected with the nuts after passing through the mounting holes, so as to realize the detachable connection of the collecting cylinder 41 and the cylinder body 21.

[0120] Please refer to Figure 3 and Figure 5As an optional mode of the embodiment, the clamping structure 43 comprises a mounting shell 431, a connecting rod 432, a clamping shaft 433, an elastic member 434 and a driving frame 435. The mounting shell 431 is mounted in the interior of the collecting cylinder 41. One end of the clamping shaft 433 is connected in the mounting shell 431 and connected with the mounting shell 431 through the elastic member 434. The other end of the clamping shaft 433 penetrates the mounting shell 431, the collecting cylinder 41 and the clamping hole 521 in sequence. The driving frame 435 is connected with the clamping shaft 433 through the connecting rod 432.

[0121] The valve piece 6 further comprises a pushing block 63 mounted at the bottom of the valve plate 62. The bottom of the pushing block 63 is provided with a slope surface and aligned with one end of the driving frame 435 away from the connecting rod 432.

[0122] When the cleaning of the lithium-sinking crude lithium is completed, the lifting cylinder 61 lowers the valve plate 62 so that the valve plate 62 enters the interior of the collecting cylinder 41. At this time, the lithium-sinking crude lithium enters the collecting cylinder 41. The valve plate 62 continues to be lowered so that the pushing block 63 at the bottom of the valve plate 62 acts on the driving frame 435. The slope surface at the bottom of the pushing block 63 acts on the driving frame 435 to push the driving frame 435 towards the lifting cylinder 61. The driving frame 435 drives the clamping shaft 433 to move out of the clamping hole 521 and into the collecting cylinder 41 through the connecting rod 432. At the same time, the clamping shaft 433 compresses the elastic member 434, as shown in Figure 9 (a) and Figure 9 (b);

[0123] Thus, the unlocking of the clamping structure 43 and the clamping plate 52 can be realized.

[0124] When the collecting cylinder 41 is mounted with the liquid outlet pipe 201 again, the supporting block 42 is assembled into the connecting sleeve 51 and offset from the jack 511. The clamping shaft 433 is aligned with the clamping hole 521. The lifting cylinder 61 lifts the valve plate 62 so that the valve plate 62 seals the bottom end of the cylinder body 21 again. The valve plate 62 drives the pushing block 63 to move upwards and separate from the driving frame 435. At this time, the elastic member 434 is elastically stretched to push the clamping shaft 433 to insert into the clamping hole 521 again to realize the clamping with the clamping plate 52.

[0125] Thus, the valve piece 6 can realize the unlocking of the connecting piece 5 and the clamping structure 43 to realize the unlocking of the collecting cylinder 41 and the liquid outlet pipe 201 without additional unlocking operation, which is convenient to use.

[0126] The elastic member 434 is a spring or a spring leaf.

[0127] As another optional mode of the embodiment, the card locking structure 43 can also be installed outside the collecting cylinder 41 through a U-shaped frame, the U-shaped frame is sleeved at the bottom end of the card locking plate 52, the card shaft 433 of the card locking structure 43 is aligned with the card hole 521 on the card locking plate 52;

[0128] When subsequently unlocked, the driving frame 435 is pulled manually, so that the card shaft 433 is separated from the card hole 521 on the card locking plate 52.

[0129] Please refer to Figure 7 As a preferred mode of the embodiment, the filter structure 8 comprises a driving member 81, a mounting ring 82, a rotating shaft 84 and a filter screen 83, the mounting ring 82 is rotatably installed inside the liquid discharge pipe 7 through the rotating shaft 84, the filter screen 83 is installed in the mounting ring 82, and the driving member 81 is used to drive the rotating shaft 84 to rotate.

[0130] By setting the mounting ring 82 to be rotatable, after each lithium precipitation and rough lithium cleaning is completed, after discharging and cleaning the cylinder body 21, the rotating shaft 84 can be rotated by the driving member 81, the rotating shaft 84 rotates the mounting ring 82, and the filter screen 83 can be rotated by one hundred and eighty degrees to realize overturning, so that clean water can be added into the cylinder body 21 subsequently, the clean water can backwash the filter screen 83, the filter screen 83 is prevented from being attached with too many impurities on the filtering side, the passability of the filter screen 83 is affected, and the service life of the filter screen 83 is prolonged through backwashing.

[0131] The mounting ring 82 is installed at one end of the liquid discharge pipe 7 connected with the liquid outlet pipe 201, and the number of the filter screens 83 can be one or two. In the embodiment, the number of the filter screens 83 is two, which are installed on both sides of the mounting ring 82, so that the filter screens 83 are closer to the end of the liquid outlet pipe 201, and the material remaining between the liquid outlet pipe 201 and the filter screens 83 during the filtration stage is greatly reduced.

[0132] And the positions between the end of the liquid outlet pipe 201 and the filter screens 83 and the side of the mounting ring 82 are all set as inclined surfaces, so that a small amount of residual material can fall into the collecting cylinder 41 subsequently.

[0133] The rotating shaft 84 is detachably connected with the liquid discharge pipe 7, both ends of the rotating shaft 84 penetrate the liquid discharge pipe 7, a sealing ring is arranged at the penetration position of the rotating shaft 84 to ensure the sealing property of the penetration position, and both ends of the rotating shaft 84 are threadedly connected with nuts located on both sides of the liquid discharge pipe 7 to limit the rotating shaft 84 (not shown in the figure). Subsequently, the nut at one end can be detached, and then the rotating shaft 84 can be removed. Subsequently, the mounting ring 82 is removed, so that the filter screen 83 can be replaced.

[0134] As another optional mode of the embodiment, only the mounting ring 82 and the filter screen 83 can be arranged, the mounting ring 82 is installed in the liquid discharge pipe 7, and the filter screen 83 is detachably installed in the mounting ring 82.

[0135] Please refer to Figure 1 and Figure 10 As an optional mode of the embodiment, the driving member 81 is a one-way gear, which is installed on the rotating shaft 84 and located outside the liquid discharge pipe 7, and the toothed plate 9 is installed on the collecting cylinder 41 and arranged at a preset angle with the driving member 81.

[0136] In the embodiment, the one-way gear includes a one-way bearing and a gear, the one-way bearing is installed on the rotating shaft 84, and the gear is installed on the one-way bearing.

[0137] When the clamping structure 43 is separated from the clamping hole 521 on the clamping plate 52, the collecting cylinder 41 is rotated clockwise by a preset angle, so that the supporting block 42 is aligned with the insertion hole 511. At this time, the toothed plate 9 is rotated by a preset angle with the collecting cylinder 41, so that the teeth on the toothed plate 9 are suspended above the driving member 81 (one-way gear). In the subsequent process of moving the collecting cylinder 41 downward to separate the top of the collecting cylinder 41 from the connecting cover 51, the teeth on the toothed plate 9 are driven by the driving member 81 (one-way gear), thereby driving the rotating shaft 84 to rotate. When the uppermost teeth on the toothed plate 9 are engaged with the driving member 81 (one-way gear), the driving member 81 (one-way gear) drives the rotating shaft 84 to rotate one hundred and eighty degrees, thereby realizing the overturning of the filter screen 83.

[0138] When the top of the collecting cylinder 41 is inserted into the connecting cover 51 to be connected with the liquid outlet pipe 201, the toothed plate 9 is again driven by the driving member 81, but the driving member 81 does not drive the rotating shaft 84 to rotate.

[0139] Preferably, an installation pipe (not shown in the figure) is sleeved on the surface of the rotating shaft 84, and the installation pipe is installed on the liquid discharge pipe 7. A rubber pad is connected between the inside of the liquid discharge pipe 7 and the rotating shaft 84, so as to increase the friction between the rotating shaft 84 and the installation pipe, and make the whole filter structure 8 not easy to rotate under the action of external force.

[0140] As another embodiment of the embodiment, the driving member 81 is a knob, which is connected with the rotating shaft 84, and the filter screen 83 is overturned by manually rotating the knob.

[0141] As still another embodiment of the embodiment, the driving member 81 includes a bracket 1 and a rotating motor, the rotating motor is installed on the liquid discharge pipe 7 through the bracket 1, the rotating shaft 84 is connected with the output end of the rotating motor, and the rotating motor is used to drive the rotating shaft 84 to rotate, thereby overturning the filter screen 83.

[0142] When the driving member 81 is a one-way gear or a knob;

[0143] Please refer to Figure 7 and Figure 8As a preferred mode of the embodiment, the top and bottom of the mounting ring 82 are symmetrically provided with two limiting grooves 821, the valve piece 6 further comprises a limiting arm 64, the limiting arm 64 is installed on one side of the valve plate 62, the bottom end of the limiting arm 64 sequentially penetrates the two limiting grooves 821, and the top end of the limiting arm 64 is embedded with the inner wall bottom of the cylinder body 21.

[0144] By providing the limiting grooves 821 on the top and bottom of the two sides of the mounting ring 82, when the valve plate 62 blocks the discharge end of the cylinder body 21, the lower end of the limiting arm 64 is inserted into the limiting grooves 821 on the top and bottom of one side of the mounting ring 82, so that the axial limiting of the mounting ring 82 can be realized, and the deflection of the filter screen 83 is avoided.

[0145] When the valve plate 62 moves downward and the valve plate 62 is aligned with the bottom of the mounting ring 82, as shown in the state of (a) in the figure, the upper end of the limiting arm 64 is inserted into the limiting grooves 821 (not shown in the figure) on the top and bottom of one side of the mounting ring 82, so that the axial limiting of the filter structure 8 can still be realized, and the rotation of the filter structure 8 caused by the gravity of the water flow or the material during the filtration is avoided. Figure 9 Subsequently, when the material is taken out, the valve plate 62 continues to descend, the limiting arm 64 is separated from the limiting grooves 821, the filter structure 8 is unlocked, and the subsequent rotation of the filter screen 83 by the driving piece 81 is realized, when the filter screen 83 is turned over, the limiting grooves 821 on the other side of the top and bottom of the mounting ring 82 are aligned with the limiting arm 64.

[0146] Therefore, in the process of switching the function of the valve piece 6 from blocking the bottom end of the cylinder body 21 and adjusting the position of the material to enable the filtration of the material by the filter structure 8 to the function of automatically unlocking the collection cylinder 41 and the liquid outlet pipe 201, the axial unlocking function of the filter structure 8 can be realized, and the filter screen 83 is prepared for subsequent turning over.

[0147] The inner wall of the collection cylinder 41 is provided with an embedding groove corresponding to the position of the limiting arm 64, so that when the valve plate 62 enters the inside of the collection cylinder 41, the limiting arm 64 can enter the embedding groove.

[0148] In the embodiment, after the filtration and cleaning of the material, the valve plate 62 descends to the bottom of the filter screen 83, and the inner wall of the cylinder body 21 can be cleaned by pure water, so that the solid material attached to the cylinder wall can enter above the valve plate 62 along with the water flow, and the waste is reduced.

[0149] The working principle of the equipment for extracting lithium from the impurity plate frame slag of spodumene is as follows:

[0150]

[0151] ​Both the saturated sodium phosphate alkaline solution and the pre-precipitation lithium solution are heated and stirred in a water bath using corresponding equipment. Then, the pre-precipitation lithium solution is slowly added to the cylinder 21 containing the saturated sodium phosphate alkaline solution using a peristaltic pump. Stirring continues for a preset time. When the reaction is complete, solid-liquid filtration is performed. The lifting cylinder 61 lowers the valve plate 62 so that it is below the drain pipe 7. At this time, the material in the cylinder 21 follows and falls. The lithium precipitation waste liquid is discharged through the drain pipe 7 after passing through the filter structure 8. The crude lithium precipitation is filtered down by the filter structure 8. After the lithium precipitation waste liquid is discharged, the lifting cylinder 61 raises the valve plate 62 again. At the same time, the valve plate 62 drives the crude lithium precipitation on it to re-enter the cylinder 21. Subsequently, pure water is added to the cylinder 21, and the mixing component 3 is used for stirring and cleaning. The mixture is heated to a preset temperature and stirred for 10-20 minutes. The solid-liquid separation is then performed in the same way.

[0152] After the cleaning is completed, the lifting cylinder 61 lowers the valve plate 62 so that the valve plate 62 enters the inside of the collecting cylinder 41. At this time, the crude lithium enters the collecting cylinder 41. The crude lithium can then be discharged by disassembling the collecting cylinder 41. It is convenient to use.

[0153] Specifically, when it is necessary to separate the collection cylinder 41 from the outlet pipe 201, firstly, the locking structure 43 is unlocked from the locking hole 521 on the locking plate 52. The lifting cylinder 61 lowers the valve plate 62 so that the valve plate 62 enters the interior of the collection cylinder 41. At this time, the lithium deposited crude lithium enters the collection cylinder 41. The valve plate 62 continues to descend, causing the pushing block 63 at the bottom of the valve plate 62 to act with the driving frame 435. The inclined surface at the bottom of the pushing block 63 acts with the driving frame 435, pushing the driving frame 435 in the direction of the lifting cylinder 61. The driving frame 435 drives the locking shaft 433 to move out of the locking hole 521 and into the collection cylinder 41 through the connecting rod 432. At the same time, the locking shaft 433 compresses the elastic element 434, such as... Figure 9 (a) and Figure 9 (b); thus, the locking structure 43 and the locking plate 52 can be unlocked;

[0154] Then rotate the collecting cylinder 41 clockwise by a preset angle until the support block 42 aligns with the insertion hole 511, as shown. Figure 6 (b) Then the collection tube 41 can be moved downwards to separate the top of the collection tube 41 from the connecting cover 51, and then the staff can take out the collection tube 41;

[0155] During subsequent installation, insert the support block 42 on the top side wall of the collecting cylinder 41 into the connecting cover 51 through the insertion hole 511. At this time, the top end of the collecting cylinder 41 abuts against the bottom end of the outlet pipe 201. Then rotate the collecting cylinder 41 to displace the support block 42 from the insertion hole 511. Figure 6 In (a), the collection cylinder 41 is supported by the action of the support block 42 and the connecting cover 51, and the locking structure 43 is aligned with the locking hole 521 of the locking plate 52;

[0156] The lifting cylinder 61 lifts the valve plate 62, and the valve plate 62 seals the bottom end of the cylinder 21 again; the valve plate 62 drives the pushing block 63 to move upwards and separates from the frame 435, and the elastic member 434 is elastically stretched to drive the clamping shaft 433 to be inserted into the clamping hole 521 again to realize the clamping of the clamping plate 52;

[0157] When the valve plate 62 moves downwards and the valve plate 62 is aligned with the bottom of the mounting ring 82, as shown in the state of (a) in the middle, the upper end of the limiting arm 64 is inserted into the limiting groove 821 (not shown in the figure) on the top and the bottom of one side of the mounting ring 82, so that the filter structure 8 can still be axially limited, and the water flow or the gravity of the material can not make the filter structure 8 rotate to filter the material. Figure 9

[0158] When the material is taken out subsequently, the valve plate 62 continues to descend, the limiting arm 64 is separated from the limiting groove 821, the filter structure 8 is unlocked, the filter screen 83 can be subsequently turned over by the driving member 81, and subsequently, clean water can be added to the inside of the cylinder 21, the clean water can backwash the filter screen 83, avoid the filter screen 83 from being attached to more impurities on the filtering side, affect the passability of the filter screen 83, and prolong the service life of the filter screen 83 by backwashing; after the filter screen 83 is turned over, the limiting groove 821 on the other side of the top and the bottom of the mounting ring 82 is aligned with the limiting arm 64.

[0159] Therefore, in the process of switching the function of the valve 6 from blocking the bottom end of the cylinder 21 and adjusting the position of the material to make it pass through the filter structure 8 for filtration to the function of automatically unlocking the collection cylinder 41 and the liquid outlet pipe 201, the axial unlocking function of the filter structure 8 can be realized to prepare for the subsequent turning over of the filter screen 83.

[0160] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent flow transformation made by using the content of the specification and the drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.​

Claims

1. An apparatus for extracting lithium from a lithium-beryllium-silicate- containing off-specification sheet casting slag, characterized by, The utility model relates to a reaction device for preparing nucleic acid, which comprises: a support; a reaction cylinder, which comprises a cylinder body, an annular cover and a heater, the cylinder body is installed on the support, the annular cover is installed outside the cylinder body and forms a heating cavity with the cylinder body, the heater is installed on the annular cover, and the output end of the heater is located in the heating cavity, a liquid supplementing pipe is connected to the annular cover; a mixing assembly for stirring the material in the reaction cylinder; a liquid discharging pipe, which is connected to a liquid outlet pipe at the bottom end of the cylinder body, and a filter structure is installed inside the liquid discharging pipe; a collecting structure, which comprises a collecting cylinder, a locking structure and a plurality of supporting blocks, the collecting cylinder is detachably installed at the bottom end of the liquid outlet pipe through a connecting piece; a valve, which comprises a lifting cylinder, a valve plate and a pushing block, the lifting cylinder is installed at the bottom of the collecting cylinder, the valve plate is installed at the output end of the lifting cylinder and seals the bottom end of the cylinder body; the connecting piece comprises a connecting cover and a locking plate, the connecting cover is sleeved and installed at the bottom end of the liquid outlet pipe, the locking plate is installed at the bottom end of the connecting cover, a plurality of insertion holes are formed at the bottom of the connecting cover; a plurality of supporting blocks are installed at the top of the collecting cylinder at intervals and are located in the connecting cover, the locking structure is installed on the collecting cylinder, and the locking structure is clamped with the clamping hole on the locking plate; the locking structure comprises a mounting shell, a connecting rod, a clamping shaft, an elastic member and a driving frame, the mounting shell is installed inside the collecting cylinder, one end of the clamping shaft is slidably connected in the mounting shell and is connected with the mounting shell through the elastic member, the other end penetrates the mounting shell, the collecting cylinder and the clamping hole in sequence, and the driving frame is connected with the clamping shaft through the connecting rod; the pushing block is installed at the bottom of the valve plate, the bottom of the pushing block is provided as an inclined surface and is aligned with the end of the driving frame away from the connecting rod; wherein the lifting cylinder lowers the valve plate so that the valve plate enters the inside of the collecting cylinder, the valve plate continues to descend, the pushing block at the bottom end of the valve plate acts on the driving frame, the inclined surface at the bottom of the pushing block acts on the driving frame, the driving frame is pushed in the direction of the lifting cylinder, the driving frame drives the clamping shaft to move out of the clamping hole and into the collecting cylinder through the connecting rod, and the clamping shaft compresses the elastic member, so that the locking structure is unlocked with the locking plate.

2. The apparatus for extracting lithium from the impurity removal plate frame sludge of spodumene according to claim 1, characterized in that, the mixing assembly comprises a lifting cylinder, a lifting frame and a stirring device, the lifting cylinder is installed on the support, one end of the lifting frame is installed at the output end of the lifting cylinder, and the other end is suspended above the cylinder body, and the stirring device is installed on the lifting frame.

3. The apparatus for extracting lithium from the impurity removal plate frame sludge of spodumene according to claim 2, characterized in that, the mixing assembly further comprises a plurality of sliding rods, and the lifting frame is sleeved on the sliding rods at one end.

4. The apparatus for extracting lithium from a spodumene impurity removal filter cake according to claim 2, characterized by, the filter structure comprises a driving member, a mounting ring, a rotating shaft and a filter screen, the mounting ring is rotatably installed inside the liquid discharging pipe through the rotating shaft, the filter screen is installed in the mounting ring, and the driving member is used to drive the rotating shaft to rotate.

5. The apparatus for extracting lithium from a spodumene impurity removal filter cake according to claim 4, characterized by, the driving member is a one-way gear, the one-way gear is installed on the rotating shaft and located outside the liquid discharging pipe, a toothed plate is installed on the collecting cylinder, and the toothed plate is provided at a preset angle with the driving member.

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