A high specific surface area nano-strontium carbonate washing and screening device and method

Abstract

This invention discloses a high specific surface area nano-strontium carbonate washing and sieving device, which includes a stirring mechanism, a sedimentation mechanism, and a drying mechanism. The stirring mechanism is mounted on a base and located above a stirring tank. A water inlet is provided on one side of the upper part of the stirring tank, and the stirring tank is connected to a first filter through an upper liquid outlet pipe. A hopper and a conveying mechanism are installed above the upper liquid outlet pipe. The sedimentation mechanism is sequentially connected to a lower liquid outlet pipe, a throttling valve, a second filter, and a first filter. A water outlet and a hot air blower are respectively provided on the upper and lower parts of one side of the sedimentation mechanism. The drying mechanism is mounted on one side of the base and has a powder hopper at the bottom. Compared with the prior art, this invention has a compact structure, stable operation, simple operation, and can achieve long-term stable operation.

Description

Technical Field

[0001] This invention relates to the field of strontium carbonate preparation technology, specifically to a high specific surface area nano-strontium carbonate washing and sieving device and method. Background Technology

[0002] Strontium carbonate is a white powder or granules, odorless and tasteless. It is mainly used in glass shells, magnetic materials, metal smelting, strontium salt preparation, electronic components, and fireworks. It is used in the manufacture of color TV cathode ray tubes, electromagnets, strontium ferrites, fireworks, fluorescent glass, signal flares, etc., and is also a raw material for the production of other strontium salts. It is used as a basic powder in the production of specialized PTC thermistor elements (for switching, demagnetizing, current limiting protection, constant temperature heating, etc.) and is a fundamental raw material for the production of strontium salts. It can also be used as a carrier for palladium in hydrogenation. Currently, strontium carbonate production processes are divided into two main categories: chemical synthesis methods yield strontium carbonate with high impurity content and poor activity, making it unsuitable for direct use in the production of electronic fine ceramic strontium titanate and difficult to use as an electronic-grade product; other methods, such as biological preparation, are complex, cannot be continuously produced, require high environmental temperatures, and consume large amounts of resources. Therefore, a method for preparing nano-strontium carbonate with low impurity content, low cost, simple operation, and continuous production has been developed, which has significant economic and social value.

[0003] Therefore, it is necessary to provide a high specific surface area nano-strontium carbonate washing and sieving device and method to solve the problems mentioned in the background art. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high specific surface area nano-strontium carbonate washing and sieving device, characterized in that it includes a stirring mechanism, a sedimentation mechanism, and a drying mechanism; the stirring mechanism is mounted on a base and located above a stirring tank; a water inlet is provided on one side of the upper part of the stirring tank, and the stirring tank is connected to a first filter through an upper liquid outlet pipe, with a hopper and a conveying mechanism installed above the upper liquid outlet pipe; the sedimentation mechanism is sequentially connected to a lower liquid outlet pipe, a throttling valve, a second filter, and a first filter, and a water outlet and a hot air blower are respectively provided above and below one side of the sedimentation mechanism; the drying mechanism is mounted on one side of the base and has a powder hopper at its bottom.

[0005] The stirring mechanism includes a motor, a rotating shaft, and blades; the motor is located above the stirring tank and the rotating shaft is fixed thereon; the rotating shaft is located inside the stirring tank and is equipped with two or more blades.

[0006] The liquid inlet of the upper outlet pipe is located at the bottom of the mixing tank, and part of the pipe is vertically fixed inside the mixing tank.

[0007] The No. 1 filter has a No. 1 filter element installed inside it, and the No. 2 filter has a No. 2 filter element installed inside it.

[0008] The sedimentation mechanism includes a sedimentation shell, inside which a mesh partition is provided. A gap is provided between the bottom of the mesh partition and the bottom of the sedimentation shell, and a discharge port is provided on one side of the bottom of the sedimentation shell.

[0009] The sedimentation shell is equipped with a partition plate that divides the internal space of the sedimentation shell into left and right parts, and the two parts are connected on the side away from the lower liquid outlet pipe.

[0010] The bottom of the two parts of the sedimentation shell is respectively set as an inclined bottom plate one and a bottom plate two, with the lowest point of the bottom plate one set at the highest point of the bottom plate two, and heating plates are provided on the lower side of both the bottom plate one and the bottom plate two.

[0011] A vibration motor and a vibration rod are provided on one side of the sedimentation shell. The vibration motor shaft is fixed with a rotating body. The vibration rod is slidably fixed on the sedimentation shell and a spring is provided between the two. A wire mesh is fixed at the bottom end of the vibration rod, which is located below the mesh partition.

[0012] The drying mechanism includes an exhaust pipe, a housing, and a heating pipe. The exhaust pipe is installed above the housing, and the heating pipe is installed below the interior space of the housing. The exhaust pipe outlet length is greater than 50% of the housing length, and the exhaust pipe has multiple right-angle bends.

[0013] A method for washing and sieving high specific surface area nano-strontium carbonate includes the following steps:

[0014] S1. Mixing and stirring: Using a stirring mechanism, crude strontium carbonate and water are mixed and stirred to form a suspension;

[0015] S2. Filtration: The suspension flowing out of the stirring mechanism is filtered using filters No. 1 and No. 2 to obtain a colloidal solution containing only nano-strontium carbonate; S3. Precipitation and transfer: The filtered colloidal solution is heated to precipitate using a precipitation mechanism, and a hot air blower blows the concentrated solution containing nano-strontium carbonate into the drying mechanism, while water containing heavy metal ions is discharged from the outlet;

[0016] S4. Drying and Collection: The water in the concentrated strontium carbonate solution is evaporated using a drying mechanism, and the dried nano-strontium carbonate falls into the powder hopper for collection.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The stirring and filtering mechanism of the present invention can effectively remove impurities and heavy metal ions from crude strontium carbonate, and is simple to operate and has significant effects; The precipitation mechanism can rapidly precipitate and transfer strontium carbonate, which is highly efficient, compact in structure, and occupies little space. The injection of strontium carbonate colloidal solution and the collection of strontium carbonate and discharge of wastewater can be carried out simultaneously, reducing operation steps, saving time, and improving production efficiency; When removing water from high-concentration strontium carbonate solution, the drying mechanism uses hot air to blow the water into the drying mechanism, and then heats and evaporates the water in the strontium carbonate solution in a suspended state, which can effectively prevent the strontium carbonate powder from caking. The collected strontium carbonate powder can be used directly without further processing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a high specific surface area nano-strontium carbonate washing and sieving device.

[0019] Figure 2 A top view of a high specific surface area nano-strontium carbonate washing and sieving device;

[0020] Figure 3 A schematic diagram of the cross-sectional structure of a high specific surface area nano-strontium carbonate washing and screening device;

[0021] Figure 4 This is a schematic cross-sectional view of the sedimentation mechanism.

[0022] Figure 5 This is a partially enlarged view of the cross-sectional structural schematic diagram of the sedimentation mechanism;

[0023] Figure 6 This is a schematic cross-sectional view of the sedimentation and drying mechanisms.

[0024] Figure 7 This is a partially enlarged view of the cross-sectional structural schematic diagram of the sedimentation mechanism and the drying mechanism;

[0025] Figure 8 This is a schematic cross-sectional view of the drying mechanism;

[0026] In the diagram: 1. Stirring mechanism; 2. Inlet; 3. Upper outlet pipe; 4. Stirring tank; 5. Base; 6. Hopper; 7. Conveying mechanism; 8. Filter No. 1; 9. Filter No. 2; 10. Throttling valve; 11. Lower outlet pipe; 12. Sedimentation mechanism; 13. Outlet; 14. Hot air blower; 15. Drying mechanism; 16. Powder hopper; 101. Motor; 102. Rotating shaft; 103. Blades; 81. Filter element 91; Filter element 2; Sedimentation shell; Mesh partition; Heating plate; Foot; Vibration motor; Rotating body; Vibration rod; Spring; Wire mesh; Bottom plate 1; Partition plate; Bottom plate 2; Discharge port; Exhaust pipe; Outer shell; Heating tube. Detailed Implementation

[0027] Please see Figures 1-8 In this embodiment of the invention, a high specific surface area nano-strontium carbonate washing and sieving device is characterized by comprising a stirring mechanism 1, a sedimentation mechanism 12, and a drying mechanism 15; the stirring mechanism 1 is mounted on a base 5 and located above a stirring tank 4; a water inlet 2 is provided on one side of the upper part of the stirring tank 4, and the stirring tank 4 is connected to a first filter 8 through an upper liquid outlet pipe 3, and a hopper 6 and a conveying mechanism 7 are installed above the upper liquid outlet pipe 3; the sedimentation mechanism 12 is sequentially connected to a lower liquid outlet pipe 11, a throttle valve 10, a second filter 9, and a first filter 8, and a water outlet 13 and a hot air blower 14 are respectively provided above and below one side of the sedimentation mechanism 12; the drying mechanism 15 is mounted on one side of the base 5 and a powder hopper 16 is provided at the bottom.

[0028] In the preparation of nano-strontium carbonate, crude strontium carbonate powder is filled into hopper 6 and the equipment is started. Simultaneously, the conveying mechanism 7 feeds strontium carbonate powder into the mixing tank 4, while water is injected into the mixing tank 4 through inlet 2. It is necessary to ensure that the mass of the strontium carbonate powder being fed is 7% to 14% of the mass of the water being fed through inlet 2, so that the suspension formed by stirring contains a large amount of strontium carbonate colloid. The suspension flows out from the upper outlet pipe 3 and passes through filter 8 and filter 9 to remove impurities, obtaining a nano-strontium carbonate colloidal solution. As the colloidal solution enters the precipitation mechanism 12 and is heated, the colloidal solution aggregates, and the aggregated strontium carbonate... The strontium carbonate solution settles to the bottom of the settling mechanism 12 and flows out from the outlet 133. Then, the hot air blower 14 blows high-speed, high-pressure hot air to blow the concentrated strontium carbonate solution into the drying mechanism 15. The outlet 133 has a curved feature before the outlet of the hot air blower 14 to prevent the solution from flowing back into the hot air blower 14. The remaining water in the settling mechanism 12 will flow out from the water outlet 13 located above the mesh partition 122, without reducing the subsequent settling rate of the settling mechanism 12, while removing heavy metal ions from the strontium carbonate. After the concentrated strontium carbonate solution enters the drying mechanism 15, it is heated and the water evaporates, thus obtaining nano-strontium carbonate that falls into the powder hopper 16.

[0029] In this embodiment of the invention, the stirring mechanism 1 includes a motor 101, a rotating shaft 102, and blades 103; the motor 101 is disposed above the stirring tank 4 and the rotating shaft 102 is fixed thereon; the rotating shaft 102 is located inside the stirring tank 4 and is equipped with two or more blades 103.

[0030] The crude strontium carbonate powder and water are stirred by blade 103 to form a suspension containing strontium carbonate colloid. The blade 103 is kept tilted to generate eddies in the suspension, so that the larger strontium carbonate particles collide with the blade 103 under the action of the eddies, and the size becomes smaller, thus forming a strontium carbonate colloidal solution.

[0031] In this embodiment of the invention, the liquid inlet of the upper liquid outlet pipe 3 is located at the bottom of the stirring tank 4, and part of the pipe body is vertically fixed inside the stirring tank 4.

[0032] The stirred strontium carbonate colloidal solution enters the next mechanism from the upper outlet pipe 3. However, the large strontium carbonate particles it carries will slow down and fall in the vertical tube of the upper outlet pipe 3, and be stirred again, thereby reducing the load on the filtration mechanism and improving the output efficiency of the device.

[0033] In this embodiment of the invention, a first filter element 81 is installed inside the first filter 8, and a second filter element 91 is installed inside the second filter 9.

[0034] The selected filter element 81 has a pore size of 1μm, and the filter element 91 has a pore size of 0.1μm. After filtration, the suspension is obtained as a strontium carbonate colloidal solution containing only particles with a diameter of less than 0.1μm. The use of staged filtration reduces the load on individual filtration units and improves the filtration efficiency of the entire unit.

[0035] In this embodiment of the invention, the sedimentation mechanism 12 includes a sedimentation shell 121, a mesh partition 122 is provided inside the sedimentation shell 121, a gap is provided between the bottom of the mesh partition 122 and the bottom of the sedimentation shell 121, and a discharge port 133 is provided on one side of the bottom of the sedimentation shell 121.

[0036] After the strontium carbonate colloidal solution flows into the precipitation shell 121, the strontium carbonate in the solution will precipitate to the bottom of the precipitation shell 121 and flow to the outlet 133 through the gap between the mesh partition 122 and the precipitation shell 121.

[0037] In this embodiment of the invention, a partition plate 131 is provided inside the sedimentation shell 121. The partition plate 131 divides the internal space of the sedimentation shell 121 into left and right parts, and the two parts are connected on the side away from the lower liquid outlet pipe 11.

[0038] During the precipitation and flow of strontium carbonate in the precipitation shell 121, the obstruction of the partition plate 131 causes it to flow through a longer path, thereby prolonging the precipitation time and improving the precipitation effect.

[0039] In this embodiment of the invention, the bottom of the two parts of the sedimentation shell 121 is respectively set as an inclined bottom plate 130 and a bottom plate 132. The lowest point of the bottom plate 130 is set at the highest point of the bottom plate 132. A heating plate 123 is provided on the lower side of both the bottom plate 130 and the bottom plate 132.

[0040] The solution inside the precipitation shell 121 is heated to 80°C by the heating plate 123. The strontium carbonate colloidal particles in the solution will aggregate due to the heat and then precipitate to the upper side of the bottom plate 130 and the bottom plate 2 132. Then, the strontium carbonate precipitate slides to the lowest point of the inclined bottom plate 2 132 under the action of gravity.

[0041] In this embodiment of the invention, a vibration motor 125 and a vibration rod 127 are provided on one side of the sedimentation shell 121. The rotating shaft of the vibration motor 125 is fixed with a rotating body 126. The vibration rod 127 is slidably fixed on the sedimentation shell 121 and a spring 128 is provided between the two. A wire mesh 129 is fixed at the bottom end of the vibration rod 127, which is located below the mesh partition 122.

[0042] The vibration motor 125 is started with a period of 15 minutes, driving the rotating body 126 to apply a periodic force to the vibration rod 127, causing the fixed wire mesh 129 to vibrate and remove the strontium carbonate attached to the bottom plate 130 and bottom plate 2 132. At the same time, the interaction force between the vibration rod 127 and the precipitation shell 121 causes the precipitation shell 121 and its fixed mesh partition 122 to vibrate, thereby removing the air bubbles attached to them.

[0043] In this embodiment of the invention, the drying mechanism 15 includes an exhaust pipe 151, a housing 152, and a heating pipe 153. The exhaust pipe 151 is installed above the housing 152, and the heating pipe 153 is installed below the interior space of the housing 152. The outlet length of the exhaust pipe 151 is greater than 50% of the length of the housing 152, and the exhaust pipe 151 has multiple right-angle bends.

[0044] The strontium carbonate gas-liquid mixture blown into the drying unit 15 by the hot air blower 14 is heated by the heating tube 153 below it. The water evaporates and rises and is discharged from the exhaust pipe 151, while the nano-strontium carbonate falls and is dried and collected. The exhaust pipe 151 has a long outlet length and a large cross-sectional area, which facilitates the discharge of gas and reduces its speed. The nano-strontium carbonate carried by the gas due to rapid evaporation has its speed reduced to below 0.1 m / s after passing through the right-angle bend of the exhaust pipe 151 multiple times, thereby causing the nano-strontium carbonate carried by the gas to fall into the powder hopper 16.

[0045] A method for washing and sieving high specific surface area nano-strontium carbonate includes the following steps:

[0046] S1. Mixing and stirring: Use stirring mechanism 1 to mix and stir crude strontium carbonate and water to form a suspension.

[0047] S2. Filtration: The suspension flowing out of the stirring mechanism 1 is filtered using filter 8 and filter 9 to obtain a colloidal solution containing only nano-strontium carbonate. S3. Precipitation and transfer: The filtered colloidal solution is heated and precipitated using the precipitation mechanism 12. The concentrated solution containing nano-strontium carbonate is blown into the drying mechanism 15 by the hot air blower 14, while water containing heavy metal ions is discharged from the outlet 13.

[0048] S4. Drying and collection: The water in the concentrated strontium carbonate solution is evaporated using the drying mechanism 15, and the dried nano-strontium carbonate falls into the powder hopper 16 for collection.

[0049] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. This invention discloses a high specific surface area nano-strontium carbonate washing and sieving device, characterized in that, It includes a stirring mechanism (1), a sedimentation mechanism (12), and a drying mechanism (15); the stirring mechanism (1) is installed on the base (5) and located above the stirring tank (4); an inlet (2) is provided on one side above the stirring tank (4), and the stirring tank (4) is connected to the first filter (8) through the upper outlet pipe (3), and a hopper (6) and a conveying mechanism (7) are installed above the upper outlet pipe (3); the sedimentation mechanism (12) is connected in sequence to the lower outlet pipe (11), the throttle valve (10), the second filter (9), and the first filter (8), and an outlet (13) and a hot air blower (14) are respectively provided above and below one side of the sedimentation mechanism (12); the drying mechanism (15) is installed on one side of the base (5) and a powder hopper (16) is provided at the bottom.

2. The high specific surface area nano-strontium carbonate washing and sieving device according to claim 1, characterized in that, The stirring mechanism (1) includes a motor (101), a rotating shaft (102) and blades (103); the motor (101) is located above the stirring tank (4) and the rotating shaft (102) is fixed thereon; the rotating shaft (102) is located inside the stirring tank (4) and is equipped with two or more blades (103).

3. The high specific surface area nano-strontium carbonate washing and sieving device according to claim 1, characterized in that, The inlet of the upper outlet pipe (3) is located at the bottom of the mixing tank (4), and part of the pipe is vertically fixed inside the mixing tank (4).

4. The high specific surface area nano-strontium carbonate washing and sieving device according to claim 1, characterized in that, The first filter (8) has a first filter element (81) installed inside, and the second filter (9) has a second filter element (91) installed inside.

5. The high specific surface area nano-strontium carbonate washing and sieving device according to claim 1, characterized in that, The sedimentation mechanism (12) includes a sedimentation shell (121), a mesh partition (122) is provided inside the sedimentation shell (121), a gap is provided between the bottom of the mesh partition (122) and the bottom of the sedimentation shell (121), and a discharge port (133) is provided on one side of the bottom of the sedimentation shell (121).

6. The high specific surface area nano-strontium carbonate washing and sieving device according to claim 5, characterized in that, The sedimentation shell (121) is provided with a partition plate (131), which divides the internal space of the sedimentation shell (121) into two parts, left and right, and the two parts are connected on the side away from the lower liquid outlet pipe (11).

7. The high specific surface area nano-strontium carbonate washing and sieving device according to claim 6, characterized in that, The bottom of the two parts of the sedimentation shell (121) is respectively set as an inclined bottom plate one (130) and a bottom plate two (132). The lowest point of the bottom plate one (130) is set at the highest point of the bottom plate two (132). A heating plate (123) is provided on the lower side of both the bottom plate one (130) and the bottom plate two (132).

8. The high specific surface area nano-strontium carbonate washing and sieving device according to claim 5, characterized in that, A vibration motor (125) and a vibration rod (127) are provided on one side of the sedimentation shell (121). The vibration motor (125) has a rotating body (126) fixed on its shaft. The vibration rod (127) is slidably fixed on the sedimentation shell (121) and a spring (128) is provided between them. A wire mesh (129) is fixed at the bottom end of the vibration rod (127). The wire mesh (129) is located below the mesh partition (122).

9. The high specific surface area nano-strontium carbonate washing and sieving device according to claim 1, characterized in that, The drying mechanism (15) includes an exhaust pipe (151), a housing (152) and a heating pipe (153). The exhaust pipe (151) is installed above the housing (152), and the heating pipe (153) is installed below the interior space of the housing (152). The outlet length of the exhaust pipe (151) is greater than 50% of the length of the housing (152), and the exhaust pipe (151) has multiple right-angle bends.

10. A method for washing and sieving high specific surface area nano-strontium carbonate, using the high specific surface area nano-strontium carbonate washing and sieving device described in claim 1, characterized in that, include: S1. Mixing and stirring: using a stirring mechanism (1) to mix and stir crude strontium carbonate and water to form a suspension; S2. Filtration: The suspension flowing out of the stirring mechanism (1) is filtered using filter No. 1 (8) and filter No. 2 (9) to obtain a colloidal solution containing only nano-strontium carbonate; S3. Precipitation transfer: The filtered colloidal solution is heated to precipitate using the precipitation mechanism (12), and the concentrated solution containing nano-strontium carbonate is blown into the drying mechanism (15) by the hot air blower (14), while water containing heavy metal ions can be discharged from the outlet (13); S4. Drying and collecting: The water in the strontium carbonate concentrate is evaporated using the drying mechanism (15), and the dried nano-strontium carbonate falls into the powder hopper (16) to complete the collection.

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