Mixing device and method for diatomite

Abstract

The invention belongs to the technical field of diatomite acid leaching mixing, and mainly relates to a diatomite mixing device and method.The diatomite mixing device comprises a mixing tank, a discharging hopper is arranged on the mixing tank, a discharging opening is formed in the discharging hopper, and a coaxial reversing mechanism is arranged on the mixing tank; the coaxial reversing mechanism comprises an inner shaft extending into the mixing tank through the feed opening and an outer shaft coaxially sleeved on the inner shaft, the inner shaft and the outer shaft are in transmission connection with a driving part, an upper millstone is assembled on the outer shaft, the inner shaft penetrates through the upper millstone, a lower millstone is fixedly assembled at the lower end part of the inner shaft, and the feed opening clings to the upper side surface of the upper millstone; a grinding space communicated with the discharging opening is formed between the upper grinding disc and the lower grinding disc. When diatomite containing cakes is fed, the diatomite enters the grinding space from the discharging opening, the upper grinding disc and the lower grinding disc rotate in the opposite directions, the cake diatomite located in the grinding space is ground, the ground diatomite can be fully mixed with acid liquor which is fed at the same time, and therefore high-purity diatomite is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of diatomite acid leaching and mixing, and mainly relates to a mixing device and method for diatomite. Background Art

[0002] Diatomaceous earth is a white, light yellow or beige powder, which is the sediment of the remains of ancient diatoms. The density is 1.9~2.35g / cm 3 , there are micropores in the structure, which has good adsorption properties. The main component of natural diatomaceous earth is SiO 2 、Al 2 O 3 , the rest is Fe 2 O 3 , CaO, MgO and some organic matter. Insoluble in water, acid (except HF), dilute alkali, soluble in strong alkali. The common method for preparing high-grade diatomite is acid leaching. First, remove the gravel impurities in the diatomite. Under the condition of continuous stirring, add sulfuric acid or hydrochloric acid at a mass ratio of acid: diatomite = 1:1, and boil for a certain period of time to make the Al in the diatomite 2 O 3 , Fe 2 O 3 , CaO, MgO and other clay mineral impurities react with acid to generate soluble salts, which are then filtered, washed and dried to obtain high-grade high-quality pure diatomite.

[0003] A Chinese patent document with authorization announcement number CN219991682U discloses an acid leaching stirring tank, which includes a stirring barrel, a top cover is arranged on the top of the stirring barrel, a motor is fixed to the top of the top cover, a rotating rod is fixed to the driving end of the motor, a plurality of support frames are fixed to the outside of the rotating rod, a connecting frame is fixed to the back side of the support frame, a plurality of springs are fixed to the back side of the connecting frame, a connecting plate is fixed to the other end of the spring, a brush is fixed to the back side of the connecting plate, and sliding blocks are fixed to the upper and lower ends of the opposite sides of the connecting plate.

[0004] However, diatomite may clump, and when the above acid leaching mixing tank is used for stirring and mixing, the caking diatomite will cause uneven mixing. The caking diatomite has a hard outer shell on the outer surface, and the powdered diatomite inside cannot react with the acid solution, which will cause incomplete mixing.

[0005] Therefore, for the structure of the above-mentioned acid leaching stirring tank, the acid leaching stirring tank cannot be used to treat agglomerated diatomaceous earth. The hard shell of the diatomaceous earth still exists during the stirring and mixing process, which will cause the diatomaceous earth and the acid to be unable to be fully mixed, affecting the acid leaching treatment of the diatomaceous earth. Summary of the invention

[0006] The invention provides a mixing device and method for diatomite, so as to solve the problem in the prior art that diatomite and acid cannot be fully mixed during acid leaching of diatomite.

[0007] To solve the above problems, the present invention adopts the following technical solutions: A mixing device for diatomite comprises a mixing tank, wherein the mixing tank is provided with a lower hopper, the lower hopper is provided with a lower material outlet, the mixing tank is provided with a coaxial reversing mechanism, the coaxial reversing mechanism comprises an inner shaft extending into the mixing tank through the lower material outlet and an outer shaft coaxially sleeved on the inner shaft, the inner shaft and the outer shaft are transmission-connected with a driving member so that the inner shaft and the outer shaft have the same rotation speed and opposite rotation directions, an upper grinding disc is fixedly mounted on the lower end of the outer shaft, the inner shaft passes through the upper grinding disc, a lower grinding disc is fixedly mounted on the lower end of the inner shaft, the upper grinding disc and the lower grinding disc are located in the mixing tank, the lower material outlet is closely attached to the upper side surface of the upper grinding disc, a grinding space connected to the lower material outlet is provided between the upper grinding disc and the lower grinding disc, and the upper grinding disc and the lower grinding disc are used for grinding the diatomite agglomerated in the grinding space.

[0008] The invention has the following beneficial effects: when diatomaceous earth containing agglomerates is fed, the diatomaceous earth enters the grinding space from the feeding port, and the upper grinding disc and the lower grinding disc rotate in opposite directions to grind the agglomerated diatomaceous earth in the grinding space, so that the ground diatomaceous earth can be fully mixed with the acid solution fed at the same time, and it is ensured that the impurities in the diatomaceous earth can fully react with the acid solution, thereby obtaining high-purity diatomaceous earth.

[0009] Furthermore, the upper grinding disc and the lower grinding disc have a plurality of grinding protrusions arranged relatively in the grinding space.

[0010] The invention has the following beneficial effects: the grinding protrusions can grind the agglomerated diatomaceous earth more fully, so as to disperse the agglomerated diatomaceous earth, thereby making the diatomaceous earth fully contact with the acid solution.

[0011] Furthermore, the multiple grinding protrusions on the upper grinding disc and the lower grinding disc are all radially arranged with the inner shaft as the center.

[0012] The invention has the following beneficial effects: the grinding protrusions are radially arranged with the inner shaft as the center, so that when the upper grinding disc and the lower grinding disc grind the diatomaceous earth, it is convenient to discharge the diatomaceous earth.

[0013] Furthermore, the outer shaft is provided with a spiral blade located in the feed opening.

[0014] The invention has the following beneficial effects: the spiral blade can rotate together with the outer shaft, and during the rotation process, the diatomaceous earth and the acid liquid are spirally transported at the same time.

[0015] Furthermore, the upper grinding disc is equipped with a first stirring blade tilted upward, and the lower grinding disc is equipped with a second stirring blade tilted downward.

[0016] The invention has the following beneficial effects: the first stirring blade can rotate together with the upper grinding disc, and the second stirring blade can rotate together with the lower grinding disc, so the first stirring blade and the second stirring blade can stir the mixture of diatomaceous earth and acid liquid, so that the diatomaceous earth and acid liquid are mixed more fully.

[0017] Furthermore, the coaxial reversing mechanism also includes a support frame, which is rotatably connected to the inner shaft and the outer shaft respectively, and the driving member includes a driving motor, and a first bevel gear is transmission-connected to the rotating shaft of the driving motor, and two second bevel gears arranged opposite to each other are coaxially installed on the inner shaft and the outer shaft, and the first bevel gear is respectively meshed with the two second bevel gears to drive the outer shaft and the inner shaft to rotate.

[0018] The invention has the following beneficial effects: a second bevel gear is coaxially mounted on the inner shaft, a second bevel gear is coaxially mounted on the outer shaft, the two second bevel gears are arranged relatively, and the inner shaft and the outer shaft can rotate coaxially in opposite directions by driving the driving motor.

[0019] Furthermore, the coaxial reversing mechanism can move in the up-down direction to drive the upper grinding disc and the lower grinding disc to move; The lower hopper is installed inside the mixing tank, and the lower hopper divides the space inside the mixing tank into an upper space and a lower space. The lower opening is arranged on the lower hopper to connect the upper space with the lower space. A lower opening is provided with a lower pipe located in the lower space, and a follower pipe is guided and slid in the upper and lower directions in the lower pipe, and the follower pipe presses against the upper grinding disc. The outer shaft and the inner shaft pass through the upper space, the feed pipe and the follower pipe in sequence from top to bottom, and extend into the lower space, and the upper grinding disc and the lower grinding disc are located in the lower space; The mixing tank is provided with a feed port connected to the upper space, and the feed port is used for feeding diatomaceous earth and acid solution.

[0020] The invention has the following beneficial effects: the upper grinding disc and the lower grinding disc move in the up-down direction, so that the upper grinding disc and the lower grinding disc can beat the acid liquid and the diatomaceous earth when moving, so that the acid liquid and the diatomaceous earth are mixed more fully.

[0021] Furthermore, a hydraulic cylinder is provided on the mixing tank, and a telescopic shaft of the hydraulic cylinder presses the support frame to allow the upper grinding disc and the lower grinding disc to move in the up and down directions.

[0022] Furthermore, the feed port is divided into a first inlet for diatomite feeding and a second inlet for acid liquid feeding. A feed check valve is provided at the first inlet, a feeding pipe is provided on the feed check valve, an inclined pipe for diatomite feeding is connected to the feeding pipe, a lifting motor is installed on the feeding pipe, a piston driven by the lifting motor to achieve up and down lifting is installed in the feeding pipe, a gas check valve is provided on the piston, and a liquid valve for acid liquid feeding is installed at the second inlet.

[0023] A mixing method for diatomaceous earth, using the mixing device for diatomaceous earth, comprises the following steps: S1: Start the driving member to make the inner shaft and the outer shaft rotate coaxially in opposite directions at the same speed; S2: pouring diatomaceous earth and acid solution into the lower hopper; S3: Let diatomaceous earth and acid enter the grinding space through the discharge port; S4: The rotating upper and lower grinding plates grind the agglomerated diatomaceous earth into powder, so that the diatomaceous earth and the acid solution can be fully mixed.

[0024] The invention has the following beneficial effects: when diatomaceous earth containing agglomerates is fed, the diatomaceous earth enters the grinding space from the feeding port, and the upper grinding disc and the lower grinding disc rotate in opposite directions to grind the agglomerated diatomaceous earth in the grinding space, so that the ground diatomaceous earth can be fully mixed with the acid solution fed at the same time, and it is ensured that the impurities in the diatomaceous earth can fully react with the acid solution, thereby obtaining high-purity diatomaceous earth. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a left side view of the present invention; Figure 3 for Figure 2 Sectional view along AA direction; Figure 4 It is a structural schematic diagram of the coaxial reversal mechanism from the first perspective; Figure 5 It is a structural diagram of the coaxial reversal mechanism from the second perspective (with the follower tube shown); Figure 6 It is a structural schematic diagram of the outer shaft and the upper grinding disc in the first-person perspective of the assembled state; Figure 7 It is a structural schematic diagram of the outer shaft and the upper grinding disc in the second viewing angle of the assembled state; Figure 8 It is a structural schematic diagram of the inner shaft and the lower grinding disc in the assembled state; Fig. 9 A schematic diagram of the structure of the support frame.

[0026] Description of reference numerals: 1. Bracket; 2. Mixing tank; 3. Outer shaft; 4. Inner shaft; 5. Support frame; 6. Drive motor; 7. First bevel gear; 8. Second bevel gear; 9. Inclined tube; 10. Hydraulic cylinder; 11. Lifting motor; 12. Piston; 13. Liquid valve; 14. Air pressure balance valve; 15. Discharge pipe; 16. Feed check valve; 17. Feed pipe; 18. Upper grinding disc; 19. Lower grinding disc; 20. Spiral blade; 21. Lower hopper; 22. Upper space; 23. Lower space; 24. Lower pipe; 25. Follow-up pipe; 26. Second stirring blade; 27. First inlet; 28. Second inlet; 29. ​​Through hole; 30. First stirring blade; 31. Dropping hole; 32. Grinding protrusion. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] Various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0029] Example 1 of a mixing device for diatomaceous earth like Figure 1 As shown, a mixing device for diatomite includes a mixing tank 2, which is supported on the ground by a bracket 1. A discharge pipe 15 for discharging diatomite and acid liquid is provided at the lower outer side of the mixing tank 2. A mixing space for mixing diatomite and acid liquid is provided in the mixing tank 2. A lower hopper 21 is provided on the mixing tank 2. A discharge port is provided on the lower hopper 21. Diatomite and acid liquid enter the mixing tank 2 from the discharge port at the same time.

[0030] like Figure 2-Figure 5As shown, the mixing tank 2 is provided with a coaxial reversing mechanism, which in this embodiment comprises an inner shaft 4 extending into the mixing space in the mixing tank 2 and an outer shaft 3 coaxially sleeved on the inner shaft 4, and the inner shaft 4 and the outer shaft 3 are connected by a driving member so that the inner shaft 4 and the outer shaft 3 rotate at the same speed and in opposite directions. Figure 4 , Figure 5 , Fig. 9 As shown, the coaxial reversing mechanism in this embodiment also includes a support frame 5, which is respectively connected to the inner shaft 4 and the outer shaft 3 for rotation. The driving member in this embodiment only includes a driving motor 6, and the first bevel gear 7 is connected to the rotating shaft of the driving motor 6 for transmission. Two second bevel gears 8 arranged oppositely are coaxially mounted on the inner shaft 4 and the outer shaft 3, and the first bevel gear 7 is respectively meshed with the two second bevel gears 8 to drive the outer shaft 3 and the inner shaft 4 to rotate. That is, a second bevel gear 8 is coaxially mounted on the inner shaft 4, and a second bevel gear 8 is coaxially mounted on the outer shaft 3. The two second bevel gears 8 are arranged oppositely, and the position of the second bevel gear 8 on the inner shaft 4 is higher than the position of the second bevel gear 8 on the outer shaft 3. In the up and down direction, the first bevel gear 7 is located between the two second bevel gears 8 arranged oppositely. Through the drive of the driving motor 6, the transmission of the first bevel gear 7 and the two second bevel gears 8, the coaxial reverse rotation of the inner shaft 4 and the outer shaft 3 is realized.

[0031] An upper grinding disc 18 is fixedly mounted on the lower end of the outer shaft 3, and a through hole 29 is provided in the middle portion of the upper grinding disc 18. A lower grinding disc 19 is fixedly mounted on the lower end of the inner shaft 4, and the inner shaft 4 penetrates the upper grinding disc 18 through the through hole 29. Both the upper grinding disc 18 and the lower grinding disc 19 are located in the mixing space of the mixing tank 2, and a grinding space is provided between the lower side surface of the upper grinding disc 18 and the lower side surface of the lower grinding disc 19. A plurality of drop holes 31 are arranged circumferentially around the center of the through hole 29 on the upper grinding disc 18, and the drop opening is tightly attached to the upper side surface of the upper grinding disc 18, so that the grinding space is connected to the drop opening through the plurality of drop holes 31. When dropping materials, diatomaceous earth and acid liquid can directly enter the grinding space through the drop opening instead of directly entering the mixing tank 2. The upper grinding disc 18 and the lower grinding disc 19 are used to grind the diatomaceous earth agglomerated in the grinding space.

[0032] When diatomite containing agglomerates is fed in, the diatomite passes through the feed port and the feed hole 31 in sequence, and then enters the grinding space. Under the drive of the driving member, the upper grinding disc 18 and the lower grinding disc 19 rotate in opposite directions to grind the agglomerated diatomite in the grinding space, so that the ground diatomite can be fully mixed with the acid solution fed at the same time, ensuring that the impurities in the diatomite can fully react with the acid solution, thereby obtaining high-purity diatomite.

[0033] like Figure 6-Figure 8As shown, the lower side of the upper grinding disc 18 has a plurality of grinding protrusions 32, and the upper side of the lower grinding disc 19 also has a plurality of the same grinding protrusions 32. The grinding protrusions 32 on the upper grinding disc 18 and the grinding protrusions 32 on the lower grinding disc 19 are arranged relative to each other. The arranged grinding protrusions 32 can more fully grind the agglomerated diatomaceous earth, so that the agglomerated diatomaceous earth is dispersed, so that the diatomaceous earth can be fully contacted with the acid solution. At the same time, the grinding protrusions 32 in this embodiment are radially centered on the inner shaft 4, that is, the grinding protrusions 32 are radially centered on the through hole 29, so that when the upper grinding disc 18 and the lower grinding disc 19 grind the diatomaceous earth, it is convenient for the discharge of the diatomaceous earth, and the grinding protrusions 32 can also give the agglomerated diatomaceous earth more sufficient grinding.

[0034] In this embodiment, the outer shaft 3 is provided with a spiral blade 20 located in the feeding port. The spiral blade 20 can rotate with the outer shaft 3, and during the rotation, the diatomaceous earth and the acid solution are spirally transported at the same time.

[0035] In this embodiment, the upper grinding disc 18 is equipped with an upwardly tilted first stirring blade 30, and the lower grinding disc 19 is equipped with a downwardly tilted second stirring blade 26. The first stirring blade 30 can rotate together with the upper grinding disc 18, and the second stirring blade 26 can rotate together with the lower grinding disc 19, so the first stirring blade 30 and the second stirring blade 26 can stir the mixed mixture of diatomaceous earth and acid solution, so that the diatomaceous earth and the acid solution are more fully mixed and contacted.

[0036] like Figure 1-Figure 3As shown, a lifting member is provided on the mixing tank 2, and the lifting member can drive the coaxial reversing mechanism to move in the up-down direction, thereby driving the upper grinding disc 18 and the lower grinding disc 19 to move. The lower hopper 21 in this embodiment is assembled inside the mixing tank 2, and the lower hopper 21 divides the mixing space in the mixing tank 2 into an upper space 22 and a lower space 23. The lowering port is arranged on the lower hopper 21, so that the upper space 22 and the lower space 23 are connected through the lowering port. A lowering pipe 24 located in the lower space 23 is arranged at the lowering port, and a follower pipe 25 is guided and slidable in the lowering pipe 24 along the up-down direction. The follower pipe 25 presses against the upper side of the upper grinding disc 18, and multiple drop holes 31 are all located in the follower pipe 25 to prevent diatomaceous earth and acid liquid from directly entering the lower space 23 without first entering the grinding space. The outer shaft 3 and the inner shaft 4 pass through the upper space 22, the feed pipe 24, and the follower pipe 25 from top to bottom, and then extend into the lower space 23, where the upper grinding disc 18 and the lower grinding disc 19 are located. A feed port connected to the upper space 22 is arranged on the mixing tank 2, and the feed port is used for feeding diatomite and acid solution, that is, the diatomite and acid solution enter from the feed port, fall into the feed hopper 21 in the upper space 22, and then slide into the feed port, and then the diatomite and acid solution pass through the feed pipe 24 and the follower pipe 25 in turn, and at the same time, are transported by the spiral blade 20, and enter the grinding space from the feed hole 31, and the grinding protrusions 32 in the grinding space grind the agglomerated diatomite, and finally the diatomite and acid solution pass through the gap between two adjacent grinding protrusions 32 and flow into the lower part of the mixing tank 2. The upper grinding disc 18 and the lower grinding disc 19 move in the up-down direction, so that the upper grinding disc 18 and the lower grinding disc 19 can beat the acid liquid and the diatomaceous earth when moving, so that the acid liquid and the diatomaceous earth are mixed more fully.

[0037] The lifting member in this embodiment is a hydraulic cylinder 10, which is mounted on the mixing tank 2. The telescopic shaft of the hydraulic cylinder 10 extends in the up-down direction, and the telescopic shaft of the hydraulic cylinder 10 presses the support frame 5 to allow the upper grinding disc 18 and the lower grinding disc 19 to move in the up-down direction, thereby driving the upper grinding disc 18 and the lower grinding disc 19 to move in the up-down direction. In other embodiments, the lifting member may be a cylinder or an electric push rod.

[0038] like Figure 3As shown, the feed port is divided into a first inlet 27 for diatomite feeding and a second inlet 28 for acid liquid feeding. A feed check valve 16 is provided at the first inlet 27, and a feed pipe 17 is provided on the feed check valve 16. The feed pipe 17 is connected with an inclined pipe 9 for diatomite feeding. A lifting motor 11 is installed on the feed pipe 17. A piston 12 driven by the lifting motor 11 is installed in the feed pipe 17 to achieve up and down lifting. A gas check valve is provided on the piston 12. Normally, the piston 12 is located at the upper position of the feed pipe 17, and the diatomite enters the feed pipe 17 from the inclined pipe 9. When a certain amount is accumulated, the piston 12 will push the diatomite into the mixing tank 2. When the piston 12 pushes the diatomite to move, the gas check valve is closed, and when the piston 12 returns, the gas check valve is opened. A liquid valve 13 for acid liquid feeding is installed at the second inlet 28. The mixing tank 2 is provided with an air pressure balancing valve 14 for balancing the air pressure inside and outside the tank.

[0039] The working process of the present invention is as follows: Diatomaceous earth enters the upper space 22 from the first inlet 27, and acid enters the upper space 22 from the second inlet 28. Both diatomaceous earth and acid fall into the lower hopper 21, and then fall from the lower material port at the same time and enter the lower material pipe 24. Under the conveyance of the spiral blade 20, they enter the grinding space from the lower material port. At this time, the inner shaft 4 and the outer shaft 3 rotate coaxially and in opposite directions at the same speed, driving the upper grinding disc 18 and the lower grinding disc 19 to rotate coaxially and in opposite directions. The grinding protrusions 32 in the grinding space grind the agglomerated diatomaceous earth so that the acid and diatomaceous earth can be more fully mixed. Finally, the diatomaceous earth and acid pass through the gap between two adjacent grinding protrusions 32 and flow into the lower part of the mixing tank 2.

[0040] During grinding, the hydraulic cylinder 10 lifts up the coaxial reversing mechanism, thereby driving the upper grinding disc 18 and the lower grinding disc 19 to move in the up and down directions, so that the upper grinding disc 18 and the lower grinding disc 19 beat the acid and diatomaceous earth while moving, so that the acid and diatomaceous earth are more fully mixed.

[0041] Example 2 of a mixing device for diatomaceous earth The difference between this embodiment and embodiment 1 is that the driving member in this embodiment includes two driving motors 6, and the rotating shafts of the two driving motors 6 are both transmission-connected with first bevel gears 7. The two driving motors 6 drive the corresponding second bevel gears 8 on the inner shaft 4 and the outer shaft 3 through a first bevel gear 7, that is, one driving motor 6 drives the inner shaft 4 to rotate, and the other driving motor 6 drives the outer shaft 3 to rotate. The rotation directions of the two driving motors 6 are opposite, so that the rotation directions of the inner shaft 4 and the outer shaft 3 are opposite, thereby driving the upper grinding disc 18 and the lower grinding disc 19 to rotate in opposite directions.

[0042] Example of Mixing Method for Diatomaceous Earth A mixing method for diatomaceous earth, the specific steps are as follows: S1, start the driving motor 6, so that the inner shaft 4 and the outer shaft 3 rotate coaxially in opposite directions at the same speed, driving the upper grinding disc 18 and the lower grinding disc 19 to rotate coaxially in opposite directions; S2, diatomaceous earth enters the upper space 22 from the first inlet 27, and the acid liquid enters the upper space 22 from the second inlet 28, and the diatomaceous earth and the acid liquid both fall into the lower hopper 21; S3, after that, the diatomite and the acid solution fall from the discharge port at the same time, enter the discharge pipe 24, and enter the grinding space from the discharge port under the conveyance of the spiral blade 20; S4. At this time, the grinding protrusions 32 in the grinding space grind the agglomerated diatomaceous earth so that the acid liquid and the diatomaceous earth can be more fully mixed. Finally, the diatomaceous earth and the acid liquid pass through the gap between two adjacent grinding protrusions 32 and flow into the lower part of the mixing tank 2. While grinding, the hydraulic cylinder 10 lifts up the coaxial reversing mechanism, thereby driving the upper grinding disc 18 and the lower grinding disc 19 to move in the up and down direction, so that the upper grinding disc 18 and the lower grinding disc 19 beat the acid liquid and the diatomaceous earth when moving, so that the acid liquid and the diatomaceous earth are more fully mixed.

[0043] When diatomite containing agglomerates is fed into the grinding space from the feed port, the upper grinding disc 18 and the lower grinding disc 19 rotate in opposite directions to grind the agglomerated diatomite in the grinding space, so that the ground diatomite can be fully mixed with the acid solution fed at the same time, ensuring that the impurities in the diatomite can fully react with the acid solution, thereby obtaining high-purity diatomite.

Claims

1. A mixing device for diatomaceous earth, comprising a mixing tank, characterized in that: The mixing tank is provided with a lower hopper, which is provided with a lower feeding port. The mixing tank is provided with a coaxial reversing mechanism, which includes an inner shaft extending into the mixing tank through the lower feeding port and an outer shaft coaxially sleeved on the inner shaft. The inner shaft and the outer shaft are connected with a driving member so that the rotation speeds of the inner shaft and the outer shaft are the same and the rotation directions are opposite. The lower end of the outer shaft is fixedly equipped with an upper grinding disc, the inner shaft passes through the upper grinding disc, and the lower end of the inner shaft is fixedly equipped with a lower grinding disc. The upper grinding disc and the lower grinding disc are located in the mixing tank, the lower feeding port is close to the upper side of the upper grinding disc, and a grinding space connected to the lower feeding port is provided between the upper grinding disc and the lower grinding disc, and the upper grinding disc and the lower grinding disc are used to grind the diatomaceous earth agglomerated in the grinding space.

2. A mixing device for diatomaceous earth according to claim 1, characterized in that: The upper grinding disc and the lower grinding disc are provided with a plurality of grinding protrusions which are arranged relatively in the grinding space.

3. A mixing device for diatomaceous earth according to claim 2, characterized in that: The multiple grinding protrusions on the upper grinding disc and the lower grinding disc are all radially centered on the inner shaft.

4. A mixing device for diatomaceous earth according to claim 3, characterized in that: The outer shaft is provided with a spiral blade located in the feeding port.

5. A mixing device for diatomaceous earth according to claim 4, characterized in that: The upper grinding disc is equipped with a first stirring blade tilted upward, and the lower grinding disc is equipped with a second stirring blade tilted downward.

6. A mixing device for diatomaceous earth according to claim 5, characterized in that: The coaxial reversing mechanism also includes a support frame, which is rotatably connected to the inner shaft and the outer shaft respectively. The driving member includes a driving motor. The rotating shaft of the driving motor is transmission-connected with a first bevel gear. Two second bevel gears arranged opposite to each other are coaxially mounted on the inner shaft and the outer shaft. The first bevel gear is respectively meshed with the two second bevel gears to drive the outer shaft and the inner shaft to rotate.

7. A mixing device for diatomaceous earth according to claim 6, characterized in that: The coaxial reversing mechanism can move in the up and down directions to drive the upper grinding disc and the lower grinding disc to move; The lower hopper is installed inside the mixing tank, and the lower hopper divides the space inside the mixing tank into an upper space and a lower space. The lower opening is arranged on the lower hopper to connect the upper space with the lower space. A lower opening is provided with a lower pipe located in the lower space, and a follower pipe is guided and slid in the upper and lower directions in the lower pipe, and the follower pipe presses against the upper grinding disc. The outer shaft and the inner shaft pass through the upper space, the feed pipe and the follower pipe in sequence from top to bottom, and extend into the lower space, and the upper grinding disc and the lower grinding disc are located in the lower space; The mixing tank is provided with a feed port connected to the upper space, and the feed port is used for feeding diatomaceous earth and acid solution.

8. A mixing device for diatomaceous earth according to claim 7, characterized in that: The mixing tank is provided with a hydraulic cylinder, and the telescopic shaft of the hydraulic cylinder presses the support frame to allow the upper grinding disc and the lower grinding disc to move in the up and down directions.

9. A mixing device for diatomaceous earth according to claim 8, characterized in that: The feed port is divided into a first inlet for diatomite feeding and a second inlet for acid liquid feeding. A feed check valve is provided at the first inlet, a feed pipe is provided on the feed check valve, an inclined pipe for diatomite feeding is connected to the feed pipe, a lifting motor is installed on the feed pipe, a piston driven by the lifting motor to achieve up and down lifting is installed in the feed pipe, a gas check valve is provided on the piston, and a liquid valve for acid liquid feeding is installed at the second inlet.

10. A mixing method for diatomaceous earth, characterized in that: Using the mixing device for diatomaceous earth according to any one of claims 1 to 9 comprises the following steps: S1: Start the driving member to make the inner shaft and the outer shaft rotate coaxially in opposite directions at the same speed; S2: pouring diatomaceous earth and acid solution into the lower hopper; S3: Let diatomaceous earth and acid enter the grinding space through the discharge port; S4: The rotating upper and lower grinding plates grind the agglomerated diatomaceous earth into powder, so that the diatomaceous earth and the acid solution can be fully mixed.

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