A premixed acid system and premixed acid method for lithium extraction from ore

Abstract

The invention discloses a premixed acid system and a premixed acid method for a lithium extraction process of an ore, and relates to the technical field of lithium extraction by acidification of an ore. The system comprises a prepreg platform, an acid shower, a material pushing device, a material cutting device and a mixing feeding device. The system sprays the material uniformly laid on the prepreg platform, and then pushes the material-acid mixture into the mixing feeding device for further mixing and conveying. Compared with a method of mixing the material and sulfuric acid in an acid mixer, the acid material on the prepreg platform ensures uniform contact between the sulfuric acid and the material, and can appropriately reduce the amount of sulfuric acid used, thereby reducing production costs and acid corrosion to equipment.

Description

Technical Field

[0001] The invention relates to the technical field of ore acidification lithium extraction, and in particular to a premixed acid system and a premixed acid method for ore lithium extraction process. Background Art

[0002] The existing pyrometallurgical process for extracting lithium from ores mainly roasts spodumene twice to complete the transformation and acidification process to obtain soluble lithium sulfate. In the acidification roasting process, the transformed spodumene material and concentrated sulfuric acid are first put into the cavity of the acid mixer in a certain proportion, and the spiral mandrel of the acid mixer is used to mix and stir the mixture and transport it to the roasting kiln for acidification roasting.

[0003] In actual production, it was found that due to the shape of the cavity of the mixing acid machine, the spodumene material was unevenly accumulated at the bottom of the cavity, and the material accumulation process was accompanied by the forward transportation of the material, resulting in a short mixing time between the material and sulfuric acid, and the material and sulfuric acid could not be fully and evenly contacted and mixed. When the theoretical amount of sulfuric acid required for the acidification reaction of spodumene is injected into the mixing acid machine, the spodumene material cannot be fully contacted with the sulfuric acid, resulting in the subsequent spodumene not being able to fully react in the acidification roasting process, reducing the recovery rate of lithium extraction from the ore and causing a waste of lithium resources.

[0004] In actual production, in order to ensure that spodumene is in full contact with sulfuric acid, sulfuric acid at least 1.4-1.5 times the theoretical amount needs to be injected. The above treatment method increases the cost of production raw materials and the cost of sulfuric acid pollutant treatment, and excessive concentrated sulfuric acid will also seriously corrode the spiral mandrel and the inner wall of the acid mixer, reducing the service life of the equipment.

[0005] In addition, the prior art has also optimized the sulfuric acid injection method, such as patent CN211754779U, which changes the single-channel acid injection to a spreading acid injection. Although this technical solution increases the contact area between spodumene and sulfuric acid to a certain extent, it is obviously still unable to effectively solve the problem of insufficient material-acid contact caused by the cavity structure of the acid mixer and the conveying method of the acid mixer, and the above-mentioned spreading method cannot solve the problem of sulfuric acid etching the spiral mandrel and the inner wall of the acid mixer. Summary of the invention

[0006] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a premixed acid system and method for lithium extraction from ore, and the specific technical scheme is as follows:

[0007] A premixed acid system for lithium extraction from ore, comprising a prepreg platform, an acid shower, a material pusher, a material cutter and a mixed material feeding device; the prepreg platform, the material pusher, the material cutter and the mixed material feeding device are connected in sequence;

[0008] The prepreg platform comprises two side baffles, a material placing bottom plate, an outer baffle, two outer edge plates and a support leg; the outer baffle is arranged around the edge of the material placing bottom plate, and the outer baffle is higher than the material placing bottom plate to form a wear-resistant layer space; the two side baffles are arranged parallel and aligned along the long side direction of the material placing bottom plate, and the length of the side baffle is equal to the length of the outer baffle distributed along the long side direction of the material placing bottom plate; the spacing between the two side baffles is equal to the length of the outer baffle distributed along the short side direction of the material placing bottom plate; the outer edge plate is arranged on the side of the side baffle away from the material placing bottom plate, and the support leg is fixedly installed at the bottom of the outer edge plate;

[0009] The pushing device comprises a driving mechanism and a pushing plate, wherein the driving mechanism is installed on a side of the pushing plate that does not contact the material; the pushing plate is arranged between the two side baffles at one end away from the mixing feeding device, and the bottom surface of the pushing plate is flush with the top surface of the outer baffle away from the mixing feeding device, and the width of the pushing plate is equal to the spacing between the two side baffles to form a stacking space;

[0010] The material cutting device comprises a material cutting plate, a threaded screw, a lifting motor and a fixed frame. The threaded screw is installed on both sides of the fixed frame, one end of which is rotatably connected to the top of the fixed frame, and the other end is connected to the lifting motor. The material cutting plate is sleeved on the threaded screw. The material cutting plate is provided with an abutment groove on one side close to the mixing feeding device, and the other side is abutted with the material placing bottom plate, two side baffles and the outer baffle edge; the lifting motor drives the threaded screw to rotate and then drives the material cutting plate to rise and fall;

[0011] The mixing feeding device comprises a movable material receiving plate, three material baffle plates, a cavity, a rotating motor, a material discharge port, a transition cavity, a rotating shaft and a mixing feeding screw; the movable material receiving plate and the three material baffle plates form a material feed port, and the movable material receiving plate is rotatably connected with two adjacent material baffle plates through a rotating shaft; the transition cavity is connected with the cavity, the mixing feeding screw is arranged in the cavity, and the rotating motor is installed at one end of the mixing feeding screw; the movable material receiving plate is in contact with the material cutting plate;

[0012] The acid shower machine is arranged above the prepreg platform, and comprises an acid shower nozzle, a height adjustment device, an acid supply pump and an acid storage tank; the acid shower nozzle, the acid supply pump and the acid storage tank are connected through a conveying pipeline; the height adjustment device adjusts the distance from the acid shower nozzle to the prepreg platform; the spraying area of ​​the acid shower nozzle matches the horizontal cross-sectional profile of the stockpiling space formed by the push plate, the two side baffles and the cut-off plate.

[0013] The first part of the spodumene material is put into the wear-resistant layer space formed by the outer baffle and the material placement bottom plate. The top of the material layer is flush with the top of the outer baffle in the same plane to form a wear-resistant layer, thereby reducing the wear caused by the direct contact between the spodumene material and the material placement bottom plate during transportation. Then the second part of the spodumene material is put into the stacking space formed by the push plate, two side baffles and the cutting plate to form a stacking layer. The movable receiving plate abuts against the abutting groove.

[0014] Lower the height of the acid spray nozzle to the upper surface of the material in the stockpile space, and set the spraying amount of sulfuric acid according to the amount of spodumene material. The acid spray nozzle sprays sulfuric acid at a uniform speed. The acid liquid gradually penetrates from the top of the stockpile layer to the entire stockpile layer and the wear-resistant layer to achieve uniform mixing of the spodumene material and sulfuric acid. After the spraying is completed, let it stand for a while to ensure that the spodumene material is in full contact with the sulfuric acid.

[0015] The height of the cutting plate is lowered, and the movable material receiving plate is pressed against the cutting plate and rotated, approaching the prepreg platform until the movable material receiving plate is pressed against the outer stop edge, and the cutting plate stops descending. In the process of lowering the cutting plate, part of the acid mixture will overflow from the stacking space. Due to the presence of the abutment groove, the movable material receiving plate is always pressed against the cutting plate, ensuring that the overflowed acid mixture will all fall on the movable material receiving plate and slide along the movable material receiving plate into the cavity of the mixing feeding device.

[0016] The pushing device is started, and the pushing plate pushes the remaining materials in the pile layer to slide into the cavity along the movable receiving plate; the mixing feeding device is started, and the mixing feeding screw mixes the acid mixed material in the cavity and transports it to the lower feeding port. The acid mixed material transported to the lower feeding port completes mixing and enters the acidification and roasting equipment along the lower feeding port for the acidification and roasting process.

[0017] Furthermore, the bottom array of the material placement bottom plate is provided with a plurality of acid infiltration holes, through which excess acid slowly seeps out to prevent acid deposition and overflow; a filter is provided inside the acid infiltration holes to prevent the acid mixture from being discharged from the acid infiltration holes during acid infiltration.

[0018] Furthermore, the premixed acid system also includes an acid liquid recovery device, which includes an acid storage tank box, a recovery pump, an upper liquid level sensor, a lower liquid level sensor and a controller; the upper liquid level sensor and the lower liquid level sensor are arranged on the side wall of the acid storage tank box in an upper and lower distribution, and an acid discharge channel is arranged at the bottom of the side wall of the acid storage tank box, and the acid discharge channel, the recovery pump and the acid storage tank are connected by a pipeline.

[0019] Furthermore, the width of the cutting plate is greater than the width of the movable receiving plate and greater than the width of the pushing plate, ensuring that all materials coming out of the prepreg platform fall onto the movable receiving plate, thereby reducing the probability of leakage at the inlet of the mixing feeding device.

[0020] Furthermore, in order to ensure the smoothness and wear resistance of the relative movement between the push plate and the side baffle, wear-resistant ceramic coatings are applied on the contact surface between the push plate and the material, on the contact surface between the side baffle and the material, and on the contact surface between the push plate and the side baffle.

[0021] Furthermore, a plurality of sinking grooves are arranged at the bottom of the material placing bottom plate, and the acid infiltration holes are arranged at the bottom of the side walls of the sinking grooves.

[0022] Furthermore, in order to ensure that the movable material receiving plate does not separate from the outer stop edge during the material pushing process, a moving magnet is provided at the end of the movable material receiving plate, and a static magnet is provided on the outer side of the outer stop edge. When the movable material receiving plate abuts against the outer stop edge, the moving magnet and the static magnet are magnetically attracted to each other. The magnetic attraction force ensures that the movable material receiving plate will not be easily separated due to the external force of the material moving outward.

[0023] After unloading is completed, the cutting plate moves upward to push the movable receiving plate to rotate, so that the movable receiving plate is disengaged from the outer stop edge.

[0024] Furthermore, in order to increase the contact area between the sulfuric acid and the pile layer, the pores between the nozzles of the acid shower nozzle are densely distributed.

[0025] A premixed acid method for lithium extraction from ores, using the above-mentioned premixed acid system to perform mixed acid treatment on roasted materials, the premixed acid method comprising the following steps.

[0026] Step S1. Constructing a wear-resistant layer

[0027] The first part of the spodumene material is put into the wear-resistant layer space formed by the outer baffle and the material placement bottom plate, and the top of the material layer is flush with the top of the outer baffle to form a wear-resistant layer, and the wear-resistant layer reduces the wear caused by the direct contact between the spodumene material and the material placement bottom plate during the transportation process;

[0028] Step S2: Building a stacking layer

[0029] The second part of spodumene material is put into the stacking space formed by the push plate, the two side baffles and the cut-off plate to form a stacking layer; the movable receiving plate is in contact with the contact groove correspondingly;

[0030] Step S3. Spraying sulfuric acid

[0031] The height of the acid spray nozzle is lowered to the upper surface of the material in the stockpile space, and the spraying amount of sulfuric acid is set according to the amount of spodumene material. The acid spray nozzle sprays sulfuric acid at a uniform speed, and the acid liquid gradually infiltrates from the top of the stockpile layer to the entire stockpile layer and the wear-resistant layer, so that the spodumene material and the sulfuric acid are evenly contacted and mixed. After the spraying is completed, it is left to stand for a period of time to ensure that the spodumene material is fully in contact with the sulfuric acid;

[0032] Step S4: Pushing the material to the mixing feeding device

[0033] The height of the cutting plate is lowered, and the cutting plate abuts against the movable material receiving plate during the descending process, so that the movable material receiving plate rotates toward the direction close to the prepreg platform until the end of the movable material receiving plate abuts against the outer stop edge, and the cutting plate stops descending; in the process of lowering the cutting plate, part of the acid mixture will overflow from the stacking space, and because the movable material receiving plate always abuts against the abutment groove on one side of the cutting plate, it is ensured that the overflowed acid mixture will all fall on the movable material receiving plate and slide into the cavity along the movable material receiving plate;

[0034] Start the pushing device to drive the pushing plate to push the remaining materials in the stacking layer to slide into the cavity along the movable receiving plate;

[0035] Step S5. Mixing and conveying the material acid mixture

[0036] The acid mixture in the cavity is mixed and transported to the discharge port by the mixing and feeding screw. The acid mixture transported to the discharge port is mixed and enters the acidification and roasting equipment along the discharge port for the acidification and roasting process.

[0037] Furthermore, the premixed acid method further comprises:

[0038] Step S6. Acid recovery treatment

[0039] Excess acid seeps out through several acid seepage holes at the bottom of the loading base plate and drips into the acid storage tank. When the sulfuric acid stored in the acid storage tank reaches the upper liquid level sensor, the controller starts the recovery pump to extract the sulfuric acid in the acid storage tank from the acid discharge channel and transport it to the acid storage tank. When the sulfuric acid in the acid storage tank is lower than the lower liquid level sensor, the controller turns off the recovery pump to stop the acid discharge.

[0040] Furthermore, in step 3, the material is evenly distributed on the pre-impregnation surface and the acid spraying nozzle sprays evenly and densely, and the spraying amount is set to 1.1 to 1.2 times the theoretical sulfuric acid dosage of spodumene acidification reaction. Compared with the mixed acid treatment in the mixed acid machine, the amount of sulfuric acid can be reduced to a certain extent; the wear-resistant layer material is very thin, and the amount of sulfuric acid is negligible.

[0041] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0042] 1. The present invention discloses a premixed acid system and a premixed acid method for lithium extraction from ores. The system first sprays the material uniformly laid on the prepreg platform, and then pushes the material-acid mixture into a mixing feeding device for further mixing and conveying. Compared with the method of mixing the material and sulfuric acid in an acid mixer, the acid material on the prepreg platform ensures uniform contact between sulfuric acid and the material, which can appropriately reduce the amount of sulfuric acid used, reduce production costs and acid corrosion to equipment;

[0043] The material-acid mixture enters the mixing and feeding device. Compared with directly adding sulfuric acid into the acid mixer, the acidity of the material-acid mixture is much lower than that of concentrated sulfuric acid, which can effectively reduce the acid corrosion of components such as the cavity and the mixing and feeding screw.

[0044] 2. The present invention provides a wear-resistant layer, and the push plate moves relative to the material in the wear-resistant layer when pushing the material in the pile layer into the mixing and feeding device, and does not directly contact the material placement bottom plate, thereby reducing wear on the material placement bottom plate and extending the service life of the device.

[0045] 3. The present invention ensures that part of the acid mixed material overflowing from the material stacking space falls on the movable material receiving plate and slides into the cavity of the mixing feeding device along the movable material receiving plate by abutting the movable material receiving plate against the abutting groove of the material cutting plate during the rotation process, and the width of the movable material receiving plate is greater than the width of the material pushing plate; magnets are provided at the abutting positions of the movable material receiving plate and the outer baffle, and the magnetic attraction ensures that the two will not be easily separated. The above designs can reduce the probability of materials spilling outside the system, reduce accidental material losses, and protect the environment.

[0046] 4. The loading bottom plate of the present invention is provided with acid infiltration holes and filter screens. The acid liquid seeping out from the loading bottom plate is quantitatively recovered and transported to the acid storage tank through the acid liquid recovery device for spraying sulfuric acid on the spodumene material, thereby reducing the amount of sulfuric acid used and preventing excessive acid liquid accumulation on the pre-impregnation platform from overflowing and polluting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the three-dimensional structure of the premixed acid system;

[0048] Figure 2 It is a front view of the premixed acid system;

[0049] Figure 3 It is a structural schematic diagram of the prepreg platform;

[0050] Figure 4 It is a cross-sectional schematic diagram of the material layout of the prepreg platform;

[0051] Figure 5 It is a structural schematic diagram of the material cutting device;

[0052] Figure 6 It is a schematic diagram of the external structure of the mixing feeding device;

[0053] Figure 7 It is a schematic diagram of the internal structure of the mixing feeding device;

[0054] Figure 8 This is a schematic diagram of the position relationship between the movable receiving plate, the cutting plate, the material placement bottom plate and the outer edge under the material storage state:

[0055] Fig. 9 This is a schematic diagram of the position relationship between the movable receiving plate, the cutting plate, the material placement bottom plate and the outer stop edge in the pushing state:

[0056] Fig.10 for Figure 8 A local enlarged view of point A;

[0057] Fig.11 It is a schematic diagram of the magnetic connection between the movable receiving plate and the outer stop edge in the pushing state.

[0058] Among them: 1-acid shower machine; 11-acid shower nozzle; 12-height adjustment device; 13-acid pump; 14-acid storage tank; 2-push device; 21-driving mechanism; 22-push plate; 3-pre-impregnation platform; 31-side baffle; 32-bottom plate; 321-acid infiltration hole; 322-filter screen; 323-sinking trough; 33-outer baffle; 331-static magnet; 34-outer edge plate; 35-support leg; 4-acid recovery device; 41-acid storage tank box; 411-acid discharge channel; 4 2-upper liquid level sensor; 43-recovery pump; 44-lower liquid level sensor; 5-cutting device; 51-cutting plate; 511-butting groove; 52-threaded screw; 53-lifting motor; 54-fixed frame; 6-mixing feeding device; 61-movable receiving plate; 611-moving magnet; 62-blocking plate; 63-cavity; 64-rotating motor; 65-discharging port; 66-transition cavity; 67-rotating shaft; 68-mixing feeding screw; 100-wear-resistant layer; 200-pile layer. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The following is a preferred embodiment of the present invention, which is intended to provide a basic understanding of the present invention, but is not intended to confirm the key or decisive elements of the present invention or to limit the scope of protection.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation manner of the present invention is not limited thereto.

[0062] A premixed acid system for lithium extraction from ore, see the attached Figure 1 , Attachment Figure 2 The premixed acid system includes a prepreg platform 3, an acid shower machine 1, a material pushing device 2, a material cutting device 5 and a mixed material feeding device 6; the prepreg platform 3, the material pushing device 2, the material cutting device 5 and the mixed material feeding device 6 are connected in sequence.

[0063] Please refer to the attached Figure 3 , Attachment Figure 4The prepreg platform 3 includes two side baffles 31, a material placing bottom plate 32, an outer baffle 33, two outer edge plates 34 and a support leg 35; the outer baffle 33 is arranged around the edge of the material placing bottom plate 32, and the outer baffle 33 is higher than the material placing bottom plate 32 to form a wear-resistant layer 100 space; the two side baffles 31 are arranged parallel and aligned along the long side direction of the material placing bottom plate 32, and the length of the side baffle 31 is equal to the length of the outer baffle 33 distributed along the long side direction of the material placing bottom plate 32; the spacing between the two side baffles 31 is equal to the length of the outer baffle 33 distributed along the short side direction of the material placing bottom plate 32; the outer edge plate 34 is arranged on the side of the side baffle 31 away from the material placing bottom plate 32, and the support leg 35 is fixedly installed at the bottom of the outer edge plate 34.

[0064] Please refer to the attached Figure 4 The pushing device 2 includes a driving mechanism 21 and a pushing plate 22. The driving mechanism 21 is installed on the side of the pushing plate 22 that does not contact the material. The pushing plate 22 is arranged between the two side baffles 31 at one end away from the mixing feeding device 6, and the bottom surface of the pushing plate 22 is flush with the top surface of the outer baffle 33 away from the mixing feeding device 6. The width of the pushing plate 22 is equal to the distance between the two side baffles 31 to form a stacking space.

[0065] Please refer to the attached Figure 5 The material cutting device 5 includes a material cutting plate 51, a threaded screw 52, ​​a lifting motor 53 and a fixed frame 54. The threaded screw 52 is installed on both sides of the fixed frame 54, one end of which is rotatably connected to the top of the fixed frame 54, and the other end is connected to the lifting motor 53. The material cutting plate 51 is sleeved on the threaded screw 52. The material cutting plate 51 is provided with an abutment groove 511 on one side close to the mixing feeding device 6, and the other side is abutted with the material placing bottom plate 32, the two side baffles 31 and the outer baffle edge 33; the lifting motor 53 drives the threaded screw 52 to rotate and then drives the material cutting plate 51 to rise and fall.

[0066] Please refer to the attached Figure 6 ~Attached Fig. 9 The mixing feeding device 6 includes a movable material receiving plate 61, three material baffle plates 62, a cavity 63, a rotating motor 64, a feed port 65, a transition cavity 66, a rotating shaft 67 and a mixing feeding screw 68; the movable material receiving plate 61 and the three material baffle plates 62 constitute a feed port, and the movable material receiving plate 61 is rotatably connected to two adjacent material baffle plates 62 through a rotating shaft 67; the transition cavity 66 is communicated with the cavity 63, the mixing feeding screw 68 is arranged in the cavity 63, and the rotating motor 64 is installed at one end of the mixing feeding screw 68; the movable material receiving plate 61 is in contact with the material cutting plate 51.

[0067] Please refer to the attached Figure 1 , Attachment Figure 2The acid shower machine 1 is arranged above the prepreg platform 3, and includes an acid shower nozzle 11, a height adjustment device 12, an acid supply pump 13 and an acid storage tank 14; the acid shower nozzle 11, the acid supply pump 13 and the acid storage tank 14 are connected by a conveying pipeline; the height adjustment device 12 adjusts the distance from the acid shower nozzle 11 to the prepreg platform 3; the spraying area of ​​the acid shower nozzle 11 matches the horizontal cross-sectional profile of the stacking space formed by the push plate 22, the two side baffles 31 and the cut-off plate 51.

[0068] The first part of the spodumene material is put into the wear-resistant layer 100 space formed by the outer baffle 33 and the material loading bottom plate 32, and the top of the material layer is flush with the top of the outer baffle 33 in the same plane to form a wear-resistant layer 100, thereby reducing the wear caused by the direct contact between the spodumene material and the material loading bottom plate 32 during transportation; and then the second part of the spodumene material is put into the stacking space formed by the pushing plate 22, the two side baffles 31 and the cutting plate 51 to form a stacking layer 200; the movable receiving plate 61 abuts against the abutting groove 511.

[0069] The height of the acid spray nozzle 11 is lowered to the upper surface of the material in the stockpile space, and the spraying amount of sulfuric acid is set according to the amount of spodumene material. The acid spray nozzle 11 sprays sulfuric acid at a uniform speed, and the acid liquid gradually penetrates from the top of the stockpile layer 200 to the entire stockpile layer 200 and the wear-resistant layer 100 to achieve uniform mixing of the spodumene material and sulfuric acid. After the spraying is completed, it is allowed to stand for a period of time to ensure that the spodumene material and the sulfuric acid are fully contacted and mixed.

[0070] The height of the cutting plate 51 is lowered. During the lowering process, the cutting plate 51 always abuts against the movable material receiving plate 61 through the abutting groove 511, so as to drive the movable material receiving plate 61 to rotate around the rotation axis 67 toward the direction close to the prepreg platform 3, until the movable material receiving plate 61 abuts against the outer stop 33, at which time the cutting plate 51 stops descending. During the lowering process of the cutting plate 51, part of the acid mixture will overflow from the stacking space. Due to the existence of the abutting groove 511, the movable material receiving plate 61 always abuts against the cutting plate 51 and will not detach. The overflowed acid mixture will all fall on the movable material receiving plate 61 and slide into the cavity 63 along the movable material receiving plate 61.

[0071] Start the pushing device 2, and the pushing plate 22 pushes the remaining material in the stacking layer 200 to slide into the cavity 63 along the movable receiving plate 61; start the mixing feeding device 6, and the mixing feeding screw 68 mixes the acid mixture in the cavity 63 and transports it to the lower feed port 65. The acid mixture transported to the lower feed port 65 completes mixing and enters the acidification and roasting equipment along the lower feed port 65 for the acidification and roasting process.

[0072] Furthermore, a plurality of acid seepage holes 321 are provided at the bottom of the loading bottom plate 32, and excess acid slowly seeps out along the acid seepage holes 321, thereby preventing acid deposition and overflow from corroding the device and extending the life of the device; a filter screen 322 is provided inside the acid seepage hole 321, and the acid mixture is filtered through the filter screen 322 to prevent the acid mixture from being discharged from the acid seepage hole 321 during acid seepage.

[0073] Further, the premixed acid system also includes an acid recovery device 4, which includes an acid storage tank box 41, a recovery pump 43, an upper liquid level sensor 42, a lower liquid level sensor 44 and a controller; the upper liquid level sensor 42 and the lower liquid level sensor 44 are arranged on the side wall of the acid storage tank box 41 in an upper and lower distribution, the upper liquid level sensor 42 corresponds to the high-range liquid level of the acid storage tank box 41, and the lower liquid level sensor 44 corresponds to the low-range liquid level of the acid storage tank box 41. An acid discharge channel 411 is arranged at a position below the lower liquid level sensor 44 at the bottom of the side wall of the acid storage tank box 41, and the acid discharge channel 411, the recovery pump 43, and the acid storage tank 14 are connected in sequence through pipelines.

[0074] Furthermore, the width of the cutting plate 51 is greater than the width of the movable receiving plate 61 and greater than the width of the pushing plate 22, ensuring that the material coming out of the prepreg platform 3 completely falls onto the movable receiving plate 61, thereby reducing the probability of leakage at the inlet of the mixing feeding device 6.

[0075] Furthermore, in order to ensure the smoothness and wear resistance of the relative movement between the push plate 22 and the side baffle 31, wear-resistant ceramic coatings are coated on the surface where the push plate 22 contacts the material, the surface where the side baffle 31 contacts the material, and the contact surface between the push plate 22 and the side baffle 31.

[0076] For further information, see Appendix Fig.10 A plurality of sinking grooves 323 are arranged at the bottom of the material placing bottom plate 32 , and the acid infiltration holes 321 are arranged at the bottom of the side wall of the sinking groove 323 .

[0077] For further information, see Appendix Fig.11 In order to ensure that the movable material receiving plate 61 does not separate from the outer blocking edge 33 during the material pushing process, a moving magnet 611 is provided at the end of the movable material receiving plate 61 close to the material placing bottom plate 32, and a static magnet 331 is provided on the outer side of the outer blocking edge 33 close to the mixing feeding device 6. When the movable material receiving plate 61 abuts against the outer blocking edge 33, the moving magnet 611 and the static magnet 331 are magnetically attracted to each other, and the magnetic attraction force ensures that the movable material receiving plate 61 will not separate from the outer blocking edge 33 due to the external force of the material moving outward.

[0078] After unloading is completed, the threaded screw 52 is rotated to drive the material cutting plate 51 to move upward, thereby pushing the movable material receiving plate 61 to rotate in a direction away from the prepreg platform 3 to overcome the magnetic attraction between the moving magnet 611 and the static magnet 331, so that the movable material receiving plate 61 is separated from the outer stop edge 33.

[0079] Furthermore, in order to ensure the contact area between the sulfuric acid and the material layer 200, the nozzles of the acid shower nozzle 11 are densely distributed.

[0080] A premixed acid method for lithium extraction from ores, using the premixed acid system to perform mixed acid treatment on roasted materials, the premixed acid method comprising the following steps.

[0081] Step S1. Constructing the wear-resistant layer 100

[0082] The first part of the spodumene material is put into the wear-resistant layer 100 space formed by the outer baffle 33 and the material placement bottom plate 32, and the top of the material layer is flush with the top of the outer baffle 33 to form the wear-resistant layer 100. The wear-resistant layer 100 reduces the wear caused by the direct contact between the spodumene material and the material placement bottom plate 32 during the transportation process;

[0083] Step S2: Building a stacking layer 200

[0084] The second part of the spodumene material is put into the stacking space formed by the push plate 22, the two side baffles 31 and the cutting plate 51 to form a stacking layer 200; the movable receiving plate 61 is in contact with the contact groove 511;

[0085] Step S3. Spraying sulfuric acid

[0086] The height of the acid shower nozzle 11 is lowered to the upper surface of the material in the stockpile space, and the spraying amount of sulfuric acid is set according to the amount of spodumene material. The acid shower nozzle 11 sprays sulfuric acid at a uniform speed, and the acid solution gradually infiltrates from the top of the stockpile layer 200 to the entire stockpile layer 200 and the wear-resistant layer 100, so that the spodumene material is uniformly contacted and mixed with sulfuric acid. After the spraying is completed, it is allowed to stand for a period of time to ensure that the spodumene material is fully contacted with sulfuric acid;

[0087] Step S4: Pushing the material to the mixing feeding device

[0088] The height of the material cutting plate 51 is lowered, and the material cutting plate 51 abuts against the movable material receiving plate 61 during the descending process, so that the movable material receiving plate 61 rotates toward the direction close to the prepreg platform 3, until the end of the movable material receiving plate 61 abuts against the outer stop edge 33, and the material cutting plate 51 stops descending; in the process of lowering the material cutting plate 51, part of the acid mixture will overflow from the stacking space, because the movable material receiving plate 61 always abuts against the abutting groove 511 on one side of the material cutting plate 51, it is ensured that the overflowed acid mixture will all fall on the movable material receiving plate 61 and slide into the cavity 63 along the movable material receiving plate 61;

[0089] The pushing device 2 is started to drive the pushing plate 22 to push the remaining materials in the stacking layer 200 to slide along the movable receiving plate 61 into the cavity 63;

[0090] Step S5. Mixing and conveying the material acid mixture

[0091] The acid mixture in the cavity 63 is mixed and transported to the discharge port 65 by the mixing and feeding screw 68 . The acid mixture transported to the discharge port 65 is mixed and enters the acidification and roasting equipment along the discharge port 65 for the acidification and roasting process.

[0092] Furthermore, the method further comprises:

[0093] Step S6. Acid recovery treatment

[0094] Excess acid liquid seeps out through a plurality of acid seepage holes 321 at the bottom of the loading bottom plate 32, and the excess acid liquid drips into the acid storage tank box 41. When the sulfuric acid stored in the acid storage tank box 41 reaches the upper liquid level sensor 42, the controller starts the recovery pump 43 to extract the sulfuric acid in the acid storage tank box 41 from the acid discharge channel 411 and transport it to the acid storage tank 14. When the sulfuric acid in the acid storage tank box 41 is lower than the lower liquid level sensor 44, the controller turns off the recovery pump 43 to stop the acid discharge.

[0095] Further, in step 3, the material is evenly distributed on the prepreg platform 3, the wear-resistant layer 100 material is very thin, the amount of sulfuric acid is negligible, and the acid spraying nozzle 11 sprays sulfuric acid evenly and finely, and the spraying amount is set to 1.1-1.2 times the theoretical amount of sulfuric acid used in the spodumene acidification reaction. Compared with the mixed acid treatment in the traditional acid mixing machine, the present invention can reduce the amount of sulfuric acid to 70%-80% of the amount of sulfuric acid used in the traditional acid mixing machine.

[0096] In this article, the directional words such as front, back, top, and bottom involved are defined by the positions of the parts in the drawings and the positions of the parts relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different ways of use and placement, and the use of the directional words should not limit the scope of protection claimed in this application.

[0097] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A premixed acid system for lithium extraction from ore, characterized in that: It comprises a prepreg platform (3), an acid shower machine (1), a material pushing device (2), a material cutting device (5) and a mixing material feeding device (6); the prepreg platform (3), the material pushing device (2), the material cutting device (5) and the mixing material feeding device (6) are connected in sequence; The prepreg platform (3) comprises two side baffles (31), a material placement bottom plate (32), an outer baffle (33), two outer edge plates (34) and a support leg (35); the outer baffle (33) is arranged around the edge of the material placement bottom plate (32), and the outer baffle (33) is higher than the material placement bottom plate (32) to form a wear-resistant layer space; the two side baffles (31) are arranged parallel and aligned along the long side direction of the material placement bottom plate (32), and the length of the side baffle (31) is equal to the length of the outer baffle (33) distributed along the long side direction of the material placement bottom plate (32); the spacing between the two side baffles (31) is equal to the length of the outer baffle (33) distributed along the short side direction of the material placement bottom plate (32); the outer edge plate (34) is arranged on a side of the side baffle (31) away from the material placement bottom plate (32), and the support leg (35) is fixedly mounted on the bottom of the outer edge plate (34); The pushing device (2) comprises a driving mechanism (21) and a pushing plate (22), wherein the driving mechanism (21) is mounted on a side of the pushing plate (22) that does not contact the material; the pushing plate (22) is arranged between two side baffles (31) at one end away from the mixing and feeding device (6), and the bottom surface of the pushing plate (22) is flush with the top surface of the outer baffle (33) away from the mixing and feeding device (6), and the width of the pushing plate (22) is equal to the distance between the two side baffles (31) to form a material stacking space; The material cutting device (5) comprises a material cutting plate (51), a threaded screw (52), a lifting motor (53) and a fixed frame (54); the threaded screw (52) is mounted on both sides of the fixed frame (54), one end of which is rotatably connected to the top of the fixed frame (54), and the other end of which is connected to the lifting motor (53); the material cutting plate (51) is sleeved on the threaded screw (52); a side of the material cutting plate (51) close to the mixing feeding device (6) is provided with an abutment groove (511), and the other side of the material cutting plate (51) is abutted against the material placing bottom plate (32), two side baffles (31) and an outer baffle edge (33); the lifting motor (53) drives the threaded screw (52) to rotate, thereby driving the material cutting plate (51) to rise and fall; The mixing and feeding device (6) comprises a movable material receiving plate (61), three material baffle plates (62), a cavity (63), a rotating motor (64), a material discharge port (65), a transition cavity (66), a rotating shaft (67) and a mixing and feeding screw (68); the movable material receiving plate (61) and the three material baffle plates (62) form a material feed port, and the movable material receiving plate (61) is rotatably connected to two adjacent material baffle plates (62) via a rotating shaft (67); the transition cavity (66) is communicated with the cavity (63), the mixing and feeding screw (68) is arranged in the cavity (63), and the rotating motor (64) is installed at one end of the mixing and feeding screw (68); the movable material receiving plate (61) is in contact with the material cutting plate (51); The acid shower machine (1) is arranged above the prepreg platform (3), and comprises an acid shower nozzle (11), a height adjustment device (12), an acid supply pump (13) and an acid storage tank (14); the acid shower nozzle (11), the acid supply pump (13) and the acid storage tank (14) are connected via a conveying pipeline; the height adjustment device (12) adjusts the distance between the acid shower nozzle (11) and the prepreg platform (3); the spraying area of ​​the acid shower nozzle (11) matches the horizontal cross-sectional profile of the stockpiling space enclosed by the push plate (22), the two side baffles (31) and the cut-off plate (51).

2. The premixed acid system for lithium extraction from ore according to claim 1, characterized in that: The bottom array of the material placement bottom plate (32) is provided with a plurality of acid seepage holes (321), through which excess acid slowly seeps out, thereby preventing acid from settling and overflowing; a filter screen (322) is provided inside the acid seepage holes (321), and the filter screen (322) is used to prevent the acid mixture from being discharged from the acid seepage holes (321) during acid seepage.

3. The premixed acid system for lithium extraction from ore according to claim 2, characterized in that: The invention also comprises an acid liquid recovery device (4), the acid liquid recovery device (4) comprising an acid storage tank box (41), a recovery pump (43), an upper liquid level sensor (42), a lower liquid level sensor (44) and a controller; the upper liquid level sensor (42) and the lower liquid level sensor (44) are arranged on the side wall of the acid storage tank box (41) in an upper and lower distribution manner; an acid discharge channel (411) is arranged at the bottom of the side wall of the acid storage tank box (41); the acid discharge channel (411), the recovery pump (43) and the acid storage tank (14) are connected by a pipeline.

4. The premixed acid system for lithium extraction from ore according to claim 2, characterized in that: The width of the material cutting plate (51) is greater than the width of the movable material receiving plate (61) and greater than the width of the material pushing plate (22).

5. The premixed acid system for lithium extraction from ore according to claim 1, characterized in that: The surface of the push plate (22) in contact with the material, and the surface of the side baffle (31) in contact with the material are both coated with wear-resistant ceramic coating.

6. The premixed acid system for lithium extraction from ore according to claim 1, characterized in that: A moving magnet (611) is provided at the end of the movable material receiving plate (61) close to the material placing bottom plate (32), and a static magnet (331) is provided on the outer stop edge (33) close to the movable material receiving plate (61). When the movable material receiving plate (61) abuts against the outer stop edge (33), the moving magnet (611) and the static magnet (331) are magnetically attracted to each other.

7. A premixed acid method for lithium extraction from ore, implemented using the premixed acid system according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1. Constructing a wear-resistant layer The first portion of spodumene material is placed into the wear-resistant layer space formed by the outer retaining edge (33) and the material placement bottom plate (32), and the top of the material layer is flush with the top of the outer retaining edge (33) to form a wear-resistant layer (100). The wear-resistant layer (100) reduces the wear caused by the direct contact between the spodumene material and the material placement bottom plate (32) during the transportation process; Step S2: Building a stacking layer The second portion of spodumene material is put into a stacking space formed by the pushing plate (22), the two side baffles (31) and the cutting plate (51) to form a stacking layer (200); the movable receiving plate (61) is in corresponding contact with the contact groove (511); Step S3. Spraying sulfuric acid The height of the acid spray nozzle (11) is lowered to the upper surface of the material in the stockpile space, and the spraying amount of sulfuric acid is set according to the amount of spodumene material. The acid spray nozzle (11) sprays sulfuric acid at a uniform speed, and the acid liquid gradually infiltrates from the upper side of the stockpile layer (200) to the entire stockpile layer (200) and the wear-resistant layer (100), so as to achieve uniform contact and mixing between the spodumene material and the sulfuric acid. After the spraying is completed, the spodumene material is allowed to stand for a period of time to ensure that the spodumene material is fully in contact with the sulfuric acid. Step S4. Pushing the material to the mixing feeding device The height of the cutting plate (51) is lowered, and the cutting plate (51) abuts against the movable material receiving plate (61) during the process of descending, so that the movable material receiving plate (61) rotates in a direction close to the prepreg platform (3), until the end of the movable material receiving plate (61) abuts against the outer stop edge (33), and the cutting plate (51) stops descending; in the process of lowering the cutting plate (51), part of the acid mixture will overflow from the material stacking space, and because the movable material receiving plate (61) always abuts against the abutment groove (511) on one side of the cutting plate (51), it is ensured that the overflowed acid mixture will all fall on the movable material receiving plate (61) and slide along the movable material receiving plate (61) into the cavity (63); The material pushing device (2) is started to drive the material pushing plate (22) to push the remaining material in the material stacking layer (200) to slide along the movable material receiving plate (61) into the cavity (63); Step S5. Mixing and conveying the material acid mixture The acid mixture in the cavity (63) is mixed and transported to the discharge port (65) by the mixing and feeding screw (68). The acid mixture transported to the discharge port (65) is mixed and enters the acidification and roasting equipment along the discharge port (65) to perform the acidification and roasting process.

8. The premixed acid method for extracting lithium from ore according to claim 7, characterized in that: Also includes: Step S6. Acid recovery treatment Excess acid liquid seeps out through a plurality of acid seepage holes (321) at the bottom of the material placement bottom plate (32) and drips into the acid storage tank box (41). When the sulfuric acid stored in the acid storage tank box (41) reaches the upper liquid level sensor (42), the controller starts the recovery pump (43) to extract the sulfuric acid in the acid storage tank box (41) from the acid discharge channel (411) and transport it to the acid storage tank (14). When the sulfuric acid in the acid storage tank box (41) is lower than the lower liquid level sensor (44), the controller turns off the recovery pump (43) to stop acid discharge.

9. The premixed acid method for extracting lithium from ore according to claim 7, characterized in that: In step S3, the material is evenly distributed on the prepreg platform (3), and the acid spraying nozzle (11) sprays sulfuric acid evenly and densely, and the spraying amount is set to 1.1 to 1.2 times the theoretical amount of sulfuric acid used in the spodumene acidification reaction.

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