A wet grinding device and wet grinding method for producing nano calcium carbonate

Abstract

The present invention provides a wet grinding device and a wet grinding method for the production of nano calcium carbonate, and relates to the field of nano calcium carbonate production. The wet grinding device and the wet grinding method for the production of nano calcium carbonate include a wet grinding box, wherein multiple groups of annular baffles are arranged inside the wet grinding box from the inside to the outside, the annular baffles of the inner circle are higher than the annular baffles of the outer circle, and the annular baffles between two adjacent groups of annular baffles and the annular baffles of the innermost circle form a primary wet grinding chamber. The wet grinding device and the wet grinding method for the production of nano calcium carbonate use stirring mechanisms to perform wet grinding in different wet grinding chambers, and the more stirring mechanisms are used, the faster the stirring speed is, so that the raw materials can be fully wet ground in a graded manner, and the wet grinding efficiency can be accelerated. By setting filter plates with different filter diameters, small particles can pass through the filter plates, and the filter plates are backwashed through the inner spray holes to block the surface. Such a setting can improve the efficiency of particulate matter passing through the filter plates to avoid accumulation at the filter plates.

Description

Technical Field

[0001] The invention relates to the field of nano calcium carbonate production, in particular to wet grinding equipment and a wet grinding method for producing nano calcium carbonate. Background Art

[0002] Nano calcium carbonate is a calcium carbonate product with a particle size between 1 and 100 nanometers, which has unique physical and chemical properties, such as quantum size effect, surface effect and macro quantum tunneling effect. This material is widely used in many fields, including plastics, rubber, coatings, inks, medicine, food, etc., due to its high specific surface area, excellent biocompatibility and controllable surface charge.

[0003] Carbonization is the main method used in industry because of its wide range of raw materials, low cost and environmental protection. Different preparation methods will affect the crystal form, particle size and morphology of calcium carbonate, thus determining its performance in different applications. The carbonization method includes calcining limestone to generate calcium oxide, which reacts with water to generate calcium hydroxide, and then crushed into slurry under high shear force. The calcium hydroxide slurry is added to the reactor and carbon dioxide gas is introduced for carbonization reaction to generate nano calcium carbonate.

[0004] Calcium hydroxide needs to be crushed into slurry through wet grinding. Wet grinding can provide high-efficiency grinding effect. Wet grinding also has the characteristics of low noise, fine and uniform grinding particle size, and less pollution to the working environment.

[0005] The existing patent (CN204974134U) is a lime wet grinding system, which involves a grinding system. It includes a feeding device, a mill, a roller screen, a slurry storage tank, and an auger. The feeding device is provided with a feeding port, a water supply port, and a discharge port, wherein the discharge port of the feeding device is connected to the feed port of the mill, the discharge port of the mill is connected to the feed port of the roller screen, the discharge port of the roller screen corresponds to the feed port of the auger, and the slurry storage tank is arranged at the lower end of the roller screen.

[0006] This technical solution can provide a lime wet grinding system with low energy consumption and fine lime particles obtained by grinding, which is more conducive to use in the subsequent desulfurization process. However, the wet grinding method provided by this technical solution is overall grinding. When large particles exist after wet grinding, they need to be returned to the grinding device as a whole for grinding.

[0007] The existing patent (CN113967504B) is a wet grinding equipment for the production of nano calcium carbonate, which includes a crushing box, a crushing roller, a feeding mechanism, a cover body, b feeding mechanism, a transfer box, a base, a support seat, a drum, a feed end cover, a discharge end cover, a guide rack and a water inlet pipe; the crushing box and the base are arranged side by side; the crushing roller is rotatably arranged in the crushing box; the guide rack is tilted in the crushing box; the cover body is arranged on the crushing box; a feeding mechanism is arranged on the cover body; the support seat is arranged on the base; the drum is rotatably arranged on the support seat; the feed end cover and the discharge end cover are respectively arranged at both ends of the drum; a driving mechanism for driving the drum to rotate is arranged on the base; the transfer box is arranged on the base; b feeding mechanism and water inlet pipe are both arranged on the transfer box; the water inlet pipe is arranged on the transfer box.

[0008] Although this technical solution can automatically transport small particles of calcium carbonate and separate large particles from small particles, the remaining large particles are likely to clog the filter plate, resulting in some small particles being unable to pass through the filter plate and be discharged in time, making it impossible to achieve graded wet grinding. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides a wet grinding device and a wet grinding method for producing nano calcium carbonate, which achieves the effect of improving the efficiency of wet grinding calcium hydroxide by graded grinding.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions: A wet grinding device and wet grinding method for the production of nano calcium carbonate include a wet grinding box, wherein a plurality of groups of annular baffles are arranged inside the wet grinding box from the inside to the outside, the annular baffles of the inner circle are higher than the annular baffles of the outer circle, and a first-level wet grinding chamber is formed between two adjacent groups of annular baffles and the annular baffles of the innermost circle, a group of plug-in grooves connecting two adjacent wet grinding chambers are opened on the inner upper side of the annular baffles, a filter plate is plugged into the inside of the plug-in groove, and the aperture of the filter plate gradually decreases from the inner circle to the outer circle, the lower plane of the plug-in groove of the inner circle is located above the lower plane of the plug-in groove of the outer circle, and the outer circle of the annular baffle is slidably connected with a sealing plate, the sealing The plate covers the plug-in slot, an inner spray hole for spraying toward the filter plate is opened on the inner side of the sealing plate, an outer spray hole is opened on the lower outer side of the sealing plate, and a driving unit for driving the sealing plate to slide is arranged on one side of the sealing plate, a baffle is fixedly installed above the wet grinding chamber, a stirring mechanism rotatably connected to the wet grinding chamber is arranged in the middle of the baffle, and the number of stirring mechanisms increases from the inside to the outside, the upper end of the sealing plate is connected and penetrated by a water inlet pipe, and a slide groove sleeved on the outside of the water inlet pipe is opened on the upper surface of the baffle, a plurality of groups of control valves are arranged on the outermost circle of the wet grinding box, and a connecting sleeve is sleeved on the outermost circle of the wet grinding box, and both ends of the control valve are respectively connected to the connecting sleeve and the wet grinding box, and the outer side of the connecting sleeve is connected and penetrated by a discharge pipe.

[0011] Preferably, the stirring mechanism comprises a power source, the power source is fixedly mounted above the baffle, a rotating shaft is fixedly mounted on the output end of the power source, and stirring blades are fixedly mounted on the outer surface of the rotating shaft.

[0012] Preferably, the middle part of the baffle is rotatably connected with a clamping ring, the rotating shaft is rotatably connected to the middle part of the clamping ring, the outer ring of the upper surface of the clamping ring is fixedly installed with a bevel gear ring, the power source is fixedly installed above the clamping ring, the outer ring of the baffle is fixedly installed with a motor, the output end of the motor is fixedly installed with a bevel gear that drives the bevel gear ring to rotate, and the inner and outer rings of the baffle are fixedly connected through a connecting frame arranged above the clamping ring. A power-taking slip ring is fixedly installed at the bottom end of the connecting frame, and a power-taking slider is fixedly installed at the power supply end of the power source, and the power-taking slider contacts the power-taking slip ring.

[0013] Preferably, the bottom end of the rotating shaft is chamfered, and a boss-shaped push piece is fixedly installed at the bottom end of the rotating shaft below the stirring blade.

[0014] Preferably, the power-taking slider includes a support platform, a telescopic sleeve is fixedly installed on the upper surface of the support platform, a conductive friction plate is fixedly installed on the free end of the telescopic sleeve, the conductive friction plate and the support platform are fixedly connected by a compression spring, a conductive sliding sleeve is fixedly installed on the bottom end of the conductive friction plate, the fixed end of the conductive sliding sleeve is fixedly connected to the support platform, the conductive sliding sleeve is connected to the power supply end of the power source, and the support platform and the conductive friction plate are both sleeved inside the power-taking slip ring.

[0015] Preferably, a group of collision plates are fixedly mounted on the outer ring of the wet grinding chamber, the collision plates are arc-shaped, and the arc direction of the collision plates is opposite to the arc direction of the stirring blades.

[0016] Preferably, the outer ring of the annular partition is provided with a limiting groove with a "T"-shaped cross-section, and the inner ring of the sealing plate is fixedly mounted with a limiting block slidably connected to the inside of the limiting groove.

[0017] Preferably, the driving unit includes a fixed electromagnet and a passive magnet, the fixed electromagnet is fixedly mounted on the side wall of the annular partition, the passive magnet is fixedly mounted on the side wall of the sealing plate or the fixed electromagnet is fixedly mounted above the baffle, and the passive magnet is fixedly mounted on the outer surface of the water inlet pipe.

[0018] Preferably, there are two water inlet pipes, which are respectively connected to and communicate with the inner spray hole and the outer spray hole.

[0019] A wet grinding method for producing nano calcium carbonate, characterized in that it comprises the following steps:

[0020] S1, placing particles and water in the central layer wet grinding chamber, and performing primary wet grinding through the stirring mechanism;

[0021] S2, open the sealing plate to discharge the raw materials suspended in the water and with a particle size smaller than the aperture of the filter plate into the outer ring secondary wet grinding chamber, close the sealing plate to recoil the filter plate, and add water to the primary wet grinding chamber to continue wet grinding. The secondary wet grinding chamber continues wet grinding to reduce the particle size of the raw materials;

[0022] S3, opening the sealing plate to discharge the raw materials suspended in the water and with a particle size smaller than the aperture of the filter plate into the outer third-stage wet grinding chamber, and the outer spray hole of the sealing plate outside the first-stage wet grinding chamber sprays water to impact the sediment in the second-stage wet grinding chamber, so that the sediment particles float up and the raw material particles with a particle size smaller than the filter plate pass through the filter plate in time, until the liquid level of the second-stage wet grinding chamber is flush with the liquid level of the third-stage wet grinding chamber, closing the sealing plate to recoil the filter plate, and the third-stage wet grinding chamber continues wet grinding to reduce the particle size of the raw materials;

[0023] S4, setting the number of wet grinding chambers as required, and setting a connecting sleeve and a discharge pipe on the outside to discharge the raw material suspension that meets the requirements;

[0024] S5, the outermost slurry discharge is completed, the sealing plates are opened in turn to the inner side and the particles are accelerated to pass through the filter plate by impacting the sediment through the outer spray holes, and the filter plate is backwashed by the inner spray holes.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The wet grinding equipment and wet grinding method for producing nano calcium carbonate use stirring mechanisms to perform wet grinding in different wet grinding chambers. The more stirring mechanisms are used on the outside, the faster the stirring speed is, so that the raw materials can be fully wet ground in stages, and the wet grinding efficiency can be accelerated. In the case of a suspension, large particles are more likely to settle than small particles. The lower plane of the inner ring plug-in slot is arranged above the lower plane of the outer ring plug-in slot. Through such an arrangement, small particles can be preferentially allowed to pass through the upper filter plate to enter the lower-level materials. Large particles are accompanied by some small particles to form precipitation below the plug-in slot and temporarily do not pass through the filter plate. After passing through the upper part, water is sprayed outward through the outer spray hole at the bottom to impact the precipitation part and raise the liquid level, so that small particles in the precipitation can also pass through the filter plate. The filter plate is backwashed through the inner spray hole to block the surface. Through such an arrangement, the efficiency of particles passing through the filter plate can be improved to avoid accumulation at the filter plate.

[0027] 2. The wet grinding equipment and wet grinding method for the production of nano calcium carbonate have a rotating stirring blade and a clamping ring to support the power source. The clamping ring can be driven to rotate by a motor, so that the material in the wet grinding chamber can be fully stirred, so that the particles can be accelerated to collide with each other to achieve a smaller particle size. At the same time, a group of collision plates with a direction opposite to the arc direction of the stirring blade are arranged on the inner outer ring of the wet grinding chamber. Large particles move outward under the rotation of the stirring blade and collide with the collision plate, so that the large particles can be crushed more quickly.

[0028] 3. The wet grinding equipment and wet grinding method for the production of nano calcium carbonate, the power-taking slider includes a support platform, a telescopic sleeve is fixedly installed on the upper surface of the support platform, a conductive friction plate is fixedly installed on the free end of the telescopic sleeve, the conductive friction plate and the support platform are fixedly connected by a compression spring, a conductive sliding sleeve is fixedly installed on the bottom end of the conductive friction plate, the fixed end of the conductive sliding sleeve is fixedly connected to the support platform, the conductive sliding sleeve is connected to the power supply end of the power source, the support platform and the conductive friction plate are both sleeved inside the power-taking slip ring, and such an arrangement can ensure that the power-taking slider can always be in contact with the power-taking slip ring.

[0029] 4. The wet grinding equipment and wet grinding method for the production of nano calcium carbonate have a group of collision plates fixedly installed on the outer ring of the wet grinding chamber. The collision plates are arc-shaped, and the arc direction of the collision plates is opposite to the arc direction of the stirring blades. The stirring and collision generate centrifugal force, and large particles of raw materials are thrown to the collision plates and collide with the collision plates to reduce the particle size. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 It is a half-section schematic diagram of the wet grinding box of the present invention;

[0032] Figure 3 It is a schematic diagram of the filter plate of the present invention;

[0033] Figure 4 It is a schematic diagram of the sealing plate of the present invention;

[0034] Figure 5 It is a schematic diagram of the annular partition of the present invention;

[0035] Figure 6 This is a schematic diagram of the baffle connection of the present invention;

[0036] Figure 7 This is a schematic diagram of the connection of the clamping ring of the present invention;

[0037] Figure 8 This is a schematic diagram of the connection of the rotating shaft of the present invention;

[0038] Fig. 9 This is a schematic diagram of the power-taking slider of the present invention;

[0039] Fig.10 This is a schematic diagram of the collision plate connection of the present invention.

[0040] In the figure: 1, wet grinding box; 2, annular partition; 3, power source; 4, wet grinding chamber; 5, plug-in slot; 6, filter plate; 7, sealing plate; 8, inner spray hole; 9, outer spray hole; 17, drive unit; 10, baffle; 11, stirring mechanism; 12, control valve; 13, connecting sleeve; 14, discharge pipe; 15, water inlet pipe; 16, slide slot; 18, rotating shaft; 19, stirring blade; 20, clamping ring; 21, bevel gear ring; 22, motor; 23, bevel gear; 24, connecting frame; 25, power-taking slip ring; 26, power-taking slider; 27, push piece; 261, support platform; 262, telescopic sleeve; 263, conductive friction plate; 264, compression spring; 265, conductive sliding sleeve; 28, collision plate; 29, limit slot; 30, limit block; 171, fixed electromagnet; 172, passive magnet. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0043] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0045] like Figure 1-10 As shown, a wet grinding device for the production of nano calcium carbonate comprises a wet grinding box 1, wherein a plurality of groups of annular baffles 2 are arranged inside the wet grinding box 1 from the inside to the outside, wherein the annular baffles 2 of the inner ring are higher than the annular baffles 2 of the outer ring, and a first-stage wet grinding chamber 4 is formed between two adjacent groups of annular baffles 2 and the annular baffles 2 of the innermost ring, and a group of plug-in grooves 5 for connecting two adjacent wet grinding chambers 4 are opened on the inner upper side of the annular baffles 2, and a filter plate 6 is inserted in the plug-in grooves 5, and the aperture of the filter plate 6 gradually decreases from the inner ring to the outer ring, and the lower plane of the plug-in grooves 5 of the inner ring is located above the lower plane of the plug-in grooves 5 of the outer ring, and the plug-in grooves 5 of the inner ring are higher than the plug-in grooves 5 of the outer ring and have a height difference, and a sealing plate 7 is slidably connected to the outer ring of the annular baffle 2, and the sealing plate 7 covers the plug-in grooves 5, and the connection of the two-stage wet grinding chamber 4 is realized by sliding the sealing plate 7, and an inner spray hole 8 for spraying toward the filter plate 6 is opened on the inner side of the sealing plate 7, and the inner spray hole 8 The sprayed liquid has a recoil effect on the filter plate 6, an outer spray hole 9 is provided at the lower outer side of the sealing plate 7, a driving unit 17 for driving the sealing plate 7 to slide is provided on one side of the sealing plate 7, a baffle 10 is fixedly installed above the wet grinding chamber 4, the baffle 10 is located above the primary wet grinding chamber 4 and a feed port is provided, a stirring mechanism 11 rotatably connected to the wet grinding chamber 4 is provided in the middle of the baffle 10, the stirring mechanisms 11 in different wet grinding chambers 4 have different lengths, and the number of stirring mechanisms 11 increases from the inside to the outside, the upper end of the sealing plate 7 is connected and penetrated by a water inlet pipe 15, a slide groove 16 sleeved on the outside of the water inlet pipe 15 is provided on the upper surface of the baffle 10, a plurality of control valves 12 are provided on the outermost circle of the wet grinding box 1, a connecting sleeve 13 is sleeved on the outermost circle of the wet grinding box 1, both ends of the control valve 12 are respectively connected to the connecting sleeve 13 and the wet grinding box 1, and a discharge pipe 14 is connected and penetrated on the outside of the connecting sleeve 13.

[0046] The stirring mechanism 11 includes a power source 3, which is fixedly mounted above the baffle 10. A rotating shaft 18 is fixedly mounted on the output end of the power source 3, and a stirring blade 19 is fixedly mounted on the outer surface of the rotating shaft 18. The stirring mechanism 11 accelerates the collision between the raw materials.

[0047] The middle part of the baffle 10 is rotatably connected with a clamping ring 20, the rotating shaft 18 is rotatably connected with the middle part of the clamping ring 20, the outer ring of the upper surface of the clamping ring 20 is fixedly installed with a bevel gear ring 21, the power source 3 is fixedly installed above the clamping ring 20, the outer ring of the baffle 10 is fixedly installed with a motor 22, the output end of the motor 22 is fixedly installed with a bevel gear 23 that drives the bevel gear ring 21 to rotate, and the inner and outer rings of the baffle 10 are fixedly connected through a connecting frame 24 arranged above the clamping ring 20. A power-taking slip ring 25 is fixedly installed at the bottom end of the connecting frame 24, and a power-taking slider 26 is fixedly installed at the power supply end of the power source 3, and the power-taking slider 26 is in contact with the power-taking slip ring 25. By such a setting, the stirring mechanism 11 can not only realize self-rotation, but also realize revolution, and thus can fully collide with the raw material.

[0048] The bottom end of the rotating shaft 18 is chamfered, which can make the bottom end of the rotating shaft 18 form a hemispherical shape for easy movement. The bottom end of the rotating shaft 18 is located below the stirring blade 19 and is fixedly installed with a boss-shaped push piece 27. The boss-shaped push piece 27 can raise the sediment below upward to participate in the stirring collision.

[0049] The power-taking slider 26 includes a support platform 261, a telescopic sleeve 262 is fixedly installed on the upper surface of the support platform 261, a conductive friction plate 263 is fixedly installed on the free end of the telescopic sleeve 262, the conductive friction plate 263 and the support platform 261 are fixedly connected by a compression spring 264, a conductive sliding sleeve 265 is fixedly installed on the bottom end of the conductive friction plate 263, the fixed end of the conductive sliding sleeve 265 is fixedly connected to the support platform 261, the conductive sliding sleeve 265 is connected to the power supply end of the power source 3, the support platform 261 and the conductive friction plate 263 are both sleeved inside the power-taking slip ring 25, and such an arrangement enables the power-taking slider 26 to always be in contact with the power-taking slip ring 25.

[0050] A group of collision plates 28 are fixedly installed on the outer ring of the wet grinding chamber 4. The collision plates 28 are arc-shaped, and the arc direction of the collision plates 28 is opposite to the arc direction of the stirring blades 19. The stirring collision generates centrifugal force, and large particles of raw materials are thrown to the collision plates 28 and collide with the collision plates 28 to reduce the particle size.

[0051] The outer ring of the annular partition 2 is provided with a limiting groove 29 with a "T"-shaped cross-section, and the inner ring of the sealing plate 7 is fixedly installed with a limiting block 30 slidably connected to the inside of the limiting groove 29. This arrangement can prevent the sealing plate 7 from falling off and keep it tightly attached to the annular partition 2 to maintain a seal.

[0052] The driving unit 17 includes a fixed electromagnet 171 and a passive magnet 172. The fixed electromagnet 171 is fixedly installed on the side wall of the annular partition 2, and the passive magnet 172 is fixedly installed on the side wall of the sealing plate 7 or the fixed electromagnet 171 is fixedly installed above the baffle 10, and the passive magnet 172 is fixedly installed on the outer surface of the water inlet pipe 15. The function of this part is to drive the sealing plate 7 to move, and this part can be replaced with existing technology.

[0053] There are two water inlet pipes 15, which are respectively connected to and penetrate the inner spray hole 8 and the outer spray hole 9. By providing a separate water inlet pipe 15 connected to the inner spray hole 8 and the outer spray hole 9, it is possible to avoid providing a control device for switching the water flow direction inside, thereby reducing the cost of the device.

[0054] A wet grinding method for producing nano calcium carbonate comprises the following steps:

[0055] S1, placing particles and water in the central layer wet grinding chamber 4, and performing primary wet grinding through the stirring mechanism 11;

[0056] S2, open the sealing plate 7 to discharge the raw materials suspended in the water and with a particle size smaller than the aperture of the filter plate 6 into the outer ring secondary wet grinding chamber 4, close the sealing plate 7 to recoil the filter plate 6, and add water to the primary wet grinding chamber 4 to continue wet grinding, and the secondary wet grinding chamber 4 continues wet grinding to reduce the particle size of the raw materials;

[0057] S3, opening the sealing plate 7 to discharge the raw materials suspended in the water and having a particle size smaller than the aperture of the filter plate 6 into the outer ring three-stage wet grinding chamber 4, the outer spray hole 9 of the sealing plate 7 outside the first-stage wet grinding chamber 4 sprays water to impact the precipitate in the second-stage wet grinding chamber 4, so that the precipitated particles float up and the raw material particles with a particle size smaller than the filter plate 6 pass through the filter plate 6 in time, until the liquid level of the second-stage wet grinding chamber 4 is flush with the liquid level of the third-stage wet grinding chamber 4, closing the sealing plate 7 to recoil the filter plate 6, and the third-stage wet grinding chamber 4 continues wet grinding to reduce the particle size of the raw materials;

[0058] S4, setting the number of wet grinding chambers 4 as required, and setting a connecting sleeve 13 and a discharge pipe 14 on the outside to discharge the raw material suspension that meets the requirements;

[0059] S5, the outermost slurry discharge is completed, the sealing plates 7 are opened in turn to the inner side, and the particles are impacted and precipitated through the outer spray holes 9 to accelerate the particles to pass through the filter plate 6, and the inner spray holes 8 backwash the filter plate 6.

[0060] When in use, by using the stirring mechanism 11 to perform wet grinding in different wet grinding chambers 4, the more stirring mechanisms 11 are used on the outer sides, the faster the stirring speed is, and the raw materials can be fully wet ground in stages, which can accelerate the wet grinding efficiency. In the case of a suspension, large particles are easier to precipitate than small particles. By setting the lower plane of the inner ring plug-in groove 5 to be above the lower plane of the outer ring plug-in groove 5, such a setting can preferentially allow small particles to pass through the upper filter plate 6 to enter the lower-level material, and large particles accompanied by some small particles form precipitation below the plug-in groove 5 and temporarily do not pass through the filter plate 6. After passing through the upper part, water is sprayed outwards through the outer spray hole 9 at the bottom to impact the precipitation part and raise the liquid level, so that small particles in the precipitation can also pass through the filter plate 6, and the filter plate 6 is backwashed through the inner spray hole 8 to block the surface. Such a setting can improve the efficiency of particles passing through the filter plate 6 to avoid accumulation at the filter plate 6.

[0061] The stirring mechanism 11 is configured to have a stirring blade 19 driven to rotate by a power source 3, and is provided with a clamping ring 20 to support the power source 3, and the clamping ring 20 is driven to rotate by a motor 22, so that the material in the wet grinding chamber 4 can be fully stirred, so that the particles can accelerate the collision to achieve a smaller particle size, and at the same time, a group of collision plates 28 with a direction opposite to the arc direction of the stirring blade 19 are provided on the inner outer ring of the wet grinding chamber 4, and large particles move outward under the rotation of the stirring blade 19 and collide with the collision plate 28, so that the large particle size can be crushed more quickly;

[0062] When it is necessary to discharge the slurry, first discharge the slurry formed inside the outer wet grinding chamber 4 through the control valve 12, and then close the control valve 12, and open the sealing plate 7 of the upper wet grinding chamber 4. At this time, the liquid level of the upper level is higher than the liquid level of this level, and the slurry of the upper level can enter this level through the filter plate 6, and the liquid is back-flushed through the external spray hole 9 so that the liquid level of this level and the liquid level of the upper level are both located at the lower edge of the plug-in slot 5, close the sealing plate 7 and back-flush, and similarly open the upper-upper-level sealing plate 7 through a series of operations such as slurry, so that the upper-level liquid level and the upper-upper-level liquid level are both located at the lower edge of the plug-in slot 5, and repeat the action until the slurry is completely discharged.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0064] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wet grinding device for producing nano calcium carbonate, comprising a wet grinding box (1), characterized in that: The wet grinding box (1) is provided with a plurality of groups of annular baffles (2) from the inside to the outside, the inner annular baffles (2) are higher than the outer annular baffles (2), and a primary wet grinding chamber (4) is formed between two adjacent groups of annular baffles (2) and the innermost annular baffles (2); A group of plug-in grooves (5) for connecting two adjacent wet grinding chambers (4) are provided on the inner upper side of the annular partition plate (2), and a filter plate (6) is plugged into the plug-in groove (5). The aperture of the filter plate (6) gradually decreases from the inner ring to the outer ring, and the lower plane of the plug-in groove (5) of the inner ring is located above the lower plane of the plug-in groove (5) of the outer ring; The outer ring of the annular partition plate (2) is slidably connected to a sealing plate (7), the sealing plate (7) covers the plug-in slot (5), an inner side of the sealing plate (7) is provided with an inner spray hole (8) for spraying toward the filter plate (6), an outer side of the sealing plate (7) is provided with an outer spray hole (9) at the lower side, and a driving unit (17) for driving the sealing plate (7) to slide is provided on one side of the sealing plate (7); A baffle (10) is fixedly mounted above the wet grinding chamber (4), a stirring mechanism (11) rotatably connected to the wet grinding chamber (4) is disposed in the middle of the baffle (10), the number of stirring mechanisms (11) increasing from the inside to the outside, the upper end of the sealing plate (7) is connected to and penetrates a water inlet pipe (15), the upper surface of the baffle (10) is provided with a slide groove (16) sleeved on the outside of the water inlet pipe (15), the stirring mechanism (11) comprises a power source (3), the power source (3) is fixedly mounted above the baffle (10), a rotating shaft (18) is fixedly mounted on the output end of the power source (3), a stirring blade (19) is fixedly mounted on the outer surface of the rotating shaft (18), and a group of collision plates (28) are fixedly mounted on the outer ring of the wet grinding chamber (4), the collision plates (28) are arc-shaped, and the arc direction of the collision plates (28) is opposite to the arc direction of the stirring blade (19); The outermost ring of the wet grinding box (1) is provided with a plurality of control valves (12), the outermost ring of the wet grinding box (1) is sleeved with a connecting sleeve (13), the two ends of the control valve (12) are respectively connected to the connecting sleeve (13) and the wet grinding box (1), and the outer side of the connecting sleeve (13) is connected to and penetrated by a discharge pipe (14).

2. A wet grinding device for nano calcium carbonate production according to claim 1, characterized in that: The middle part of the baffle (10) is rotatably connected to a clamping ring (20), the rotating shaft (18) is rotatably connected to the middle part of the clamping ring (20), a bevel gear ring (21) is fixedly mounted on the outer ring of the upper surface of the clamping ring (20), and the power source (3) is fixedly mounted above the clamping ring (20); A motor (22) is fixedly mounted on the outer ring of the baffle (10); a bevel gear (23) for driving the bevel gear ring (21) to rotate is fixedly mounted on the output end of the motor (22); the inner ring and the outer ring of the baffle (10) are fixedly connected via a connecting frame (24) arranged above the clamping ring (20); a power-taking slip ring (25) is fixedly mounted on the bottom end of the connecting frame (24); a power-taking slider (26) is fixedly mounted on the power supply end of the power source (3); and the power-taking slider (26) is in contact with the power-taking slip ring (25).

3. A wet grinding device for the production of nano calcium carbonate according to claim 2, characterized in that: The bottom end of the rotating shaft (18) is chamfered, and a boss-shaped push piece (27) is fixedly mounted on the bottom end of the rotating shaft (18) below the stirring blade (19).

4. A wet grinding device for the production of nano calcium carbonate according to claim 2, characterized in that: The power extraction slider (26) comprises a support platform (261), a telescopic sleeve (262) is fixedly mounted on the upper surface of the support platform (261), a conductive friction plate (263) is fixedly mounted on the free end of the telescopic sleeve (262), the conductive friction plate (263) and the support platform (261) are fixedly connected via a compression spring (264), a conductive sliding sleeve (265) is fixedly mounted on the bottom end of the conductive friction plate (263), the fixed end of the conductive sliding sleeve (265) is fixedly connected to the support platform (261), the conductive sliding sleeve (265) is connected to the power supply end of the power source (3), and the support platform (261) and the conductive friction plate (263) are both sleeved inside the power extraction slip ring (25).

5. A wet grinding device for producing nano calcium carbonate according to claim 4, characterized in that: The outer ring of the annular partition plate (2) is provided with a limiting groove (29) having a "T"-shaped cross-section, and the inner ring of the sealing plate (7) is fixedly mounted with a limiting block (30) slidably connected to the inside of the limiting groove (29).

6. A wet grinding device for the production of nano calcium carbonate according to claim 5, characterized in that: The driving unit (17) comprises a fixed electromagnet (171) and a passive magnet (172); the fixed electromagnet (171) is fixedly mounted on the side wall of the annular partition (2); the passive magnet (172) is fixedly mounted on the side wall of the sealing plate (7); or the fixed electromagnet (171) is fixedly mounted above the baffle (10); and the passive magnet (172) is fixedly mounted on the outer surface of the water inlet pipe (15).

7. A wet grinding device for the production of nano calcium carbonate according to claim 6, characterized in that: There are two water inlet pipes (15), and the two water inlet pipes (15) are respectively connected to and communicate with the inner spray hole (8) and the outer spray hole (9).

8. A method for using a wet grinding device for producing nano calcium carbonate according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, placing particles and water in a central layer wet grinding chamber (4), and performing primary wet grinding through a stirring mechanism (11); S2, opening the sealing plate (7) to discharge the raw material suspended in the water and having a particle size smaller than the aperture of the filter plate (6) into the outer ring secondary wet grinding chamber (4), closing the sealing plate (7) to backwash the filter plate (6), and adding water to the primary wet grinding chamber (4) to continue wet grinding. The secondary wet grinding chamber (4) continues to wet grind to reduce the particle size of the raw material; S3, opening the sealing plate (7) to discharge the raw materials suspended in the water and having a particle size smaller than the aperture of the filter plate (6) into the outer third-stage wet grinding chamber (4), spraying water from the outer spray hole (9) of the sealing plate (7) outside the first-stage wet grinding chamber (4) to impact the precipitate in the second-stage wet grinding chamber (4), so that the precipitate particles float up and the raw material particles with a particle size smaller than the filter plate (6) pass through the filter plate (6) in time, until the liquid level of the second-stage wet grinding chamber (4) is flush with the liquid level of the third-stage wet grinding chamber (4), closing the sealing plate (7) to backwash the filter plate (6), and the third-stage wet grinding chamber (4) continues to wet grind to reduce the particle size of the raw materials; S4, setting the number of wet grinding chambers (4) as required, and arranging a connecting sleeve (13) and a discharge pipe (14) on the outside to discharge the raw material suspension that meets the requirements; S5, the outermost slurry discharge is completed, the sealing plates (7) are opened in turn toward the inner side, and the particles are impacted and precipitated through the outer spray holes (9) to accelerate the particles to pass through the filter plate (6), and the inner spray holes (8) are used to backwash the filter plate (6).

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