Barium sulfate drying device

Abstract

The barium sulfate drying device comprises a closed cylindrical shell, a drying cavity and a dispersing cavity are sequentially formed in the shell from top to bottom, a receiving groove is formed in the position, corresponding to a feeding port, in the drying cavity, a conical material distributing head is arranged in the middle of the interior of the receiving groove, and a plurality of first spray heads are embedded in the bottom of the material distributing head; the first spray head is connected to an air heater located outside the shell through an air supply pipe; the bottom of the drying cavity shrinks and is connected with the dispersing cavity, and a spiral dispersing channel is arranged in the dispersing cavity. According to the invention, drying and dispersion of materials can be completed through one device, the process flow is reduced, the device is simplified, and the cost can be reduced while the production efficiency is improved. Wet materials are driven by high-pressure hot air to rotate and move upwards along the receiving groove, the wet materials are dried by the hot air and are rubbed with the inner wall of the receiving groove at the same time, finally, small-particle powder is formed and leaves the receiving groove, the granularity and dryness uniformity of a barium sulfate finished product are improved, and the quality of the barium sulfate finished product is correspondingly improved.

Description

Technical Field

[0001] The invention relates to the technical field of barium sulfate production equipment, in particular to a barium sulfate drying device. Background Art

[0002] Barium sulfate is a common raw material in modern industry, and is widely used in paints, coatings, plastics, rubber, papermaking and medicine. The mineral of barium sulfate is called barite. It is a white amorphous powder. It is stable and difficult to dissolve in water, acid, alkali or organic solvents. Barium sulfate is used in radiological examinations, mainly because it can absorb X-rays in the gastrointestinal tract and develop images, so it is mainly used as a gastrointestinal contrast agent. It can also be used as a weighting agent for oil and gas drilling mud, and is also an important mineral raw material for extracting metallic barium and preparing various barium compounds.

[0003] The production methods of barium sulfate mainly include physical method and chemical method. The physical method is to directly process and refine barite ore. Usually, high-grade barite powder is melted in molten salt (CaCl2·NaOH), and then treated with water to obtain pure barium sulfate. Barite powder can also be dissolved in fuming sulfuric acid, and then diluted with water to precipitate barium sulfate. The chemical method for preparing barium sulfate is generally the Glauber's salt black ash method. The principle of the Glauber's salt black ash method is to mix barite powder and coal powder in a certain proportion for reduction, roasting to obtain black ash, at which time the barium sulfate in the barite powder is converted into barium sulfide, and then the black ash is leached with water, the barium sulfide is dissolved by water, and filtered to obtain an aqueous solution of barium sulfide, and then sodium sulfate is mixed with the barium sulfide solution to undergo a replacement reaction, generating barium sulfate precipitate and sodium sulfide solution, respectively, and filtering to obtain a precipitated barium sulfate product.

[0004] Whether it is a physical method or a chemical method, the prepared barium sulfate product is a wet material at the beginning, and it needs to be dried and dehydrated to form a dispersed and loose powder in the drying process. The current drying equipment is generally a rotary drum dryer, which adopts hot air drying or drum wall heating drying. In the process of drying with this dryer, the uniformity of the wet barium sulfate is difficult to control, and the barium sulfate that will be caused in the drying process will be hardened, so that the larger volume of the bonded barium sulfate inside has not been completely dried, and the smaller or finely broken barium sulfate has been dried, resulting in poor particle size and dryness uniformity of the finished barium sulfate, and the quality of the finished barium sulfate is difficult to control. In addition, if the powder of barium sulfate after production contains more hardened block materials, it is necessary to carry out additional crushing and grinding processing, which undoubtedly increases the production steps and is not conducive to improving production efficiency. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a barium sulfate drying device, which solves the problems in the prior art that the particle size and dryness uniformity of the finished barium sulfate product are poor, the quality of the finished barium sulfate product is difficult to control, and the additional crushing process increases the production steps, which is not conducive to improving production efficiency.

[0006] According to an embodiment of the present invention, a barium sulfate drying device comprises a closed cylindrical shell, wherein a drying chamber and a dispersion chamber are sequentially arranged inside the shell from top to bottom, a feed port is opened in the middle of the top of the drying chamber, a receiving groove is arranged in the drying chamber at a position below the feed port, the receiving groove is a conical groove body with a diameter decreasing from top to bottom, an upwardly protruding material distributor is arranged at the center of the receiving groove, the material distributor is a cone structure with a tip facing upward, a plurality of first nozzles are buried at the bottom of the material distributor in the direction corresponding to the inner wall of the receiving groove, the first nozzles are evenly distributed at equal intervals and arranged upwardly tilted, and the first nozzles are connected to a hot air blower located outside the shell through an air supply pipe;

[0007] The bottom of the drying chamber is contracted and connected to the dispersion chamber. The dispersion chamber is a vertical cylindrical structure. A spiral dispersion channel is arranged inside the dispersion chamber. The spiral dispersion channel includes a vertical partition net and a spiral blade arranged inside the partition net. The partition net is a cylindrical structure with a diameter smaller than the inner diameter of the dispersion chamber. The spiral blade is an integrated structure and is arranged in the partition net from top to bottom, so that the material descends in a spiral shape along the spiral blade. A discharge port is opened at the bottom of the drying chamber.

[0008] Furthermore, a positioning cylinder is provided at the bottom of the feed port. The positioning cylinder is a vertical cylinder structure that is thick at the top and thin at the bottom. Both ends of the positioning cylinder are open, the top end is connected to the feed port, and the bottom end is just facing the center position of the receiving groove.

[0009] Furthermore, a dispersion net is also provided at the bottom end of the positioning cylinder.

[0010] Furthermore, a plurality of second nozzles are arranged around the top edge of the positioning cylinder, the second nozzles are closely attached to the inner wall of the positioning cylinder and face downward along the inner wall of the positioning cylinder where they are located, the outer end of the positioning cylinder is connected to a circulating air pipe, the other end of the circulating air pipe extends from the outside of the shell to the bottom position of the corresponding receiving groove, and then penetrates into the shell, so that the air inlet end of the circulating air pipe is just at the bottom of the receiving groove, and an air pump is also provided on the circulating air pipe.

[0011] Furthermore, the receiving groove is a semi-ellipsoidal shell structure, and its surface is an outwardly convex arc surface. A plurality of friction lines are also arranged on the inner wall of the receiving groove. The friction lines are outwardly convex lines and are inclined arc structures.

[0012] Furthermore, the first nozzle is arranged to be inclined upward toward the inner wall of the receiving groove in the vertical direction, and is arranged to be inclined away from the radial direction of the receiving groove in the horizontal direction, so that the gas sprayed by the first nozzle forms a spiral upward airflow around the inner wall of the receiving groove inside the receiving groove.

[0013] Furthermore, a branch air pipe is buried at a position corresponding to the first nozzle inside the distribution head. The branch air pipe is a star-shaped scattering structure, and its center position corresponds to the central axis of the distribution head, and then is scatteredly connected to each first nozzle. The air supply pipe extends through the shell to the center position of the bottom of the receiving groove, and then extends upward through the receiving groove into the distribution head and is connected to the center position of the branch air pipe.

[0014] Furthermore, a resistance wire is arranged in the separation net so that the separation net can be electrically heated.

[0015] Furthermore, a disperser is provided at the bottom of the spiral dispersion channel, and the disperser includes a rotating shaft coaxially arranged at the bottom end of the dividing net, and horizontal dispersing blades are arranged on the rotating shaft. A motor is provided outside the shell to drive the rotating shaft to rotate, so that the dispersing blades rotate to disperse the materials passing by when falling.

[0016] Furthermore, a closed shaft sleeve is provided on the outside of the rotating shaft, and both ends of the rotating shaft extend out of the shaft sleeve and are connected to the scattering blades. A protective sleeve is vertically connected to the middle of the shaft sleeve, and the protective sleeve is connected to the inside of the dispersion chamber to fix the rotating shaft. A transmission rod is rotatably arranged inside the protective sleeve, one end of the transmission rod extends into the inside of the shaft sleeve, and the other end extends to the outside of the shell corresponding to the dispersion chamber. Both ends of the transmission rod are respectively connected to the motor and the rotating shaft, so that the motor drives the rotation of the rotating shaft and the scattering blades.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention is provided with a drying chamber and a dispersion chamber distributed up and down in the shell, wherein the drying chamber first dries the added barium sulfate wet material, and then places the dried material into the dispersion chamber, so that the material can be dried and dispersed by one device without additional grinding and crushing processing, thus reducing the process flow, streamlining the equipment, improving production efficiency and reducing costs;

[0019] 2. In the present invention, the drying chamber has a receiving groove with a conical groove structure, and a distributor protruding upward is arranged at the center of the receiving groove. After the wet barium sulfate material is added, it is evenly dispersed into the receiving groove through the distributor, and then the first nozzle at the bottom of the distributor sprays high-pressure hot air to drive the barium sulfate to rotate upward along the receiving groove. The material is dried by the hot air while rubbing against the inner wall of the receiving groove, thereby reducing the probability of its agglomeration, and finally forming small particles of powder and leaving from the edge of the receiving groove, which greatly improves the particle size and dryness uniformity of the finished barium sulfate product, and correspondingly improves the quality of the finished barium sulfate product;

[0020] 3. The dispersion chamber of the present invention has a spiral dispersion channel, which has spiral blades, so that the incoming barium sulfate powder moves downward in a spiral descent manner. During the spiral descent, the materials squeeze and rub against each other due to centrifugal force, thereby achieving dispersion of large pieces of material. The spiral dispersion channel also includes a partition net, so the dispersed powdery small particle material is discharged through the partition net and leaves directly, and the remaining large particle material continues to spirally descend and rub against each other inside, making it easier to disperse and crush, forming a small particle powder product with more uniform texture. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the internal structure of an embodiment of the present invention.

[0023] Figure 3 for Figure 2 Enlarged schematic diagram of part A.

[0024] Figure 4 Schematic diagram of top view of the first nozzle distribution in an embodiment of the present invention.

[0025] Figure 5 It is a structural diagram of a receiving groove according to an embodiment of the present invention.

[0026] Figure 6 Schematic diagram of the specific structure of the disperser according to an embodiment of the present invention.

[0027] In the above drawings: 1. drying chamber; 2. dispersion chamber; 3. receiving groove; 4. distribution head; 5. positioning cylinder; 6. spiral blade; 7. separation net; 8. disperser; 11. feeding funnel; 31. friction pattern; 41. first nozzle; 42. branch air pipe; 43. air supply pipe; 51. dispersion net; 52. second nozzle; 53. circulation air pipe; 54. air pump; 81. rotating shaft; 82. dispersion blade; 83. bushing; 84. transmission rod; 85. protective cover; 86. motor. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] like Figure 1 As shown, an embodiment of the present invention proposes a barium sulfate drying device, including a closed cylindrical shell, in which a drying chamber 1 and a dispersion chamber 2 are arranged in sequence from top to bottom, wherein the drying chamber 1 and the dispersion chamber 2 are both vertical cylindrical in shape, and the bottom of the drying chamber 1 is conically contracted and connected to the dispersion chamber 2, so that the diameter of the dispersion chamber 2 is smaller than that of the drying chamber 1.

[0030] like Figure 2 As shown, a feed port is provided in the middle of the top of the drying chamber 1, and a feed hopper 11 is installed corresponding to the feed port in this embodiment. A receiving groove 3 is provided in the drying chamber 1 at a position corresponding to the lower part of the feed port, and the receiving groove 3 is a conical groove body with a diameter decreasing from top to bottom. A material distributor 4 protruding upward is provided at the center of the receiving groove 3, and the material distributor 4 is a cone structure with a tip facing upward. A plurality of first nozzles 41 are buried at the bottom of the material distributor 4 in the direction corresponding to the inner wall of the receiving groove 3. The first nozzles 41 are evenly distributed at equal intervals and tilted upward, and the first nozzles 41 are connected to the hot air blower located outside the shell through an air supply pipe 43.

[0031] like Figure 3 , Figure 4 As shown, in this embodiment, a branch air pipe 42 is buried at a position corresponding to the first nozzle 41 inside the distributor 4. The branch air pipe 42 is a star-shaped scattering structure, and its center position corresponds to the central axis of the distributor 4, and then is scatteringly connected to each first nozzle 41. The air supply pipe 43 passes through the shell and extends to the center position of the bottom of the receiving groove 3, and then passes through the receiving groove 3 upward to extend into the distributor 4 and connect to the center position of the branch air pipe 42. Preferably, the first nozzle 41 is tilted upward toward the inner wall of the receiving groove 3 in the vertical direction, and is tilted away from the radial direction of the receiving groove 3 in the horizontal direction, so that the gas ejected from the first nozzle 41 forms a spiral upward airflow around the inner wall of the receiving groove 3 inside the receiving groove 3.

[0032] Obviously, the high-temperature hot air sprayed by the first nozzle 41 drives the barium sulfate wet material to move spirally inside the receiving tank 3, so that the material is dried by the hot air while rubbing against the inner wall of the receiving tank 3 during the spiral movement, making it difficult for the wet material to form a block. Figure 5As shown, as a preferred embodiment, the receiving groove 3 is a semi-ellipsoidal shell structure, and its surface is an outward convex arc surface. The inner wall of the receiving groove 3 is also provided with a plurality of friction lines 31, and the friction lines 31 are outward convex lines and are inclined arc structures. In this way, the material will contact the protruding friction lines 31 during the rotation process. Because it is in a high-speed rotating movement process, even if there are some large particles in agglomeration, they will be crushed due to the collision and friction with the friction lines 31. The material gradually forms dry small particles inside the receiving groove 3. After the weight becomes lighter, it can leave from the top edge of the receiving groove 3 under the action of centrifugal force, and then fall into the dispersion chamber 2.

[0033] In the preferred solution, a positioning cylinder 5 is provided at the bottom of the feed port. The positioning cylinder 5 is a vertical cylinder structure with a thick top and a thin bottom. Both ends of the positioning cylinder 5 are open, and its top end is connected to the feed port, and its bottom end is just facing the center of the receiving tank 3. A dispersion net 51 is also provided at the bottom of the positioning cylinder 5. After the material enters the positioning cylinder 5 through the feed port, it moves downward along the positioning cylinder 5 so that it is aligned with the material distributor 4 at the center of the receiving tank 3. At the same time, it is first impacted and broken up in the process of passing through the dispersion net 51 to avoid the accumulation of large wet materials in blocks, so that it can be more accurately and evenly dispersed and fall to the middle of the receiving tank 3.

[0034] Further, a plurality of second nozzles 52 are arranged around the top edge of the positioning cylinder 5, and the second nozzles 52 are close to the inner wall of the positioning cylinder 5 and face downward along the inner wall of the positioning cylinder 5 where they are located. A circulating air pipe 53 is connected to the outer end of the positioning cylinder 5, and the other end of the circulating air pipe 53 extends from the outer side of the shell to the corresponding bottom position of the receiving groove 3, and then penetrates and extends into the shell, so that the air inlet end of the circulating air pipe 53 is just at the bottom of the receiving groove 3, and an air pump 54 is also arranged on the circulating air pipe 53. The hot air inside the drying chamber 1 can be introduced into the positioning cylinder 5 through the circulating air pipe 53 and the air pump 54, and a downward hot air flow is formed inside the positioning cylinder 5, which can not only assist the entry of the wet barium sulfate material to prevent it from adhering to the inner wall of the positioning cylinder 5, but also use the hot air to preheat the wet material preliminarily, thereby improving the energy utilization rate. In addition, the starting end of the circulating air pipe 53 is arranged at the bottom of the receiving groove 3, which can also prevent the dried barium sulfate powder from entering the circulating air pipe 53 and causing blockage.

[0035] In the embodiment of the present invention, the dispersion chamber 2 is a vertical cylindrical structure, and a spiral dispersion channel is arranged inside the dispersion chamber 2. The spiral dispersion channel includes a vertical partition net 7 and a spiral blade 6 arranged inside the partition net 7. The partition net 7 is a cylindrical structure with a diameter smaller than the inner diameter of the dispersion chamber 2. The spiral blade 6 is an integrated structure and is arranged from top to bottom around the partition net 7, so that the material descends in a spiral along the spiral blade 6. A discharge port is provided at the bottom of the drying chamber 1. The dried barium sulfate powder moves downward in a spiral descent. During the spiral descent, the materials squeeze and rub against each other due to centrifugal force, thereby achieving the dispersion of bulk materials. The drying chamber 1 includes a partition net 7, so the dispersed powdery small particle materials are discharged through the partition net 7 and leave directly, and the remaining large particle materials continue to spirally descend and rub against each other inside, making it easier to disperse and crush, forming a small particle powder product with more uniform texture. Preferably, a resistance wire is arranged in the partition net 7, so that the partition net 7 can be electrically heated, so that part of the barium sulfate powder that has not been completely dried can be further dried to avoid the wet material from adhering to the partition net 7.

[0036] like Figure 6 As shown, in a further solution of this embodiment, a disperser 8 is also provided at the bottom of the spiral dispersion channel, and the disperser 8 includes a rotating shaft 81 coaxially arranged at the bottom end of the separation net 7, and a horizontal scattering blade is arranged on the rotating shaft 81. A motor 86 is arranged outside the shell to drive the rotating shaft 81 to rotate, so that the scattering blade rotates to scatter the materials passing by when falling. Further, a closed shaft sleeve 83 is arranged outside the rotating shaft 81, and the two ends of the rotating shaft 81 extend out of the shaft sleeve 83 and are connected to the scattering blades. A protective sleeve 85 is vertically connected to the middle of the shaft sleeve 83, and the protective sleeve 85 is linked to the inside of the dispersion chamber 2 to fix the rotating shaft 81. A transmission rod 84 is rotatably arranged inside the protective sleeve 85, and one end of the transmission rod 84 extends into the inside of the shaft sleeve 83, and the other end extends to the outside of the shell corresponding to the dispersion chamber 2. The two ends of the transmission rod 84 are respectively connected to the motor 86 and the rotating shaft 81 by bevel gear transmission, so that the motor 86 drives the rotation of the rotating shaft 81 and the scattering blades. In this way, the shaft 81, the transmission shaft and their connection positions can be isolated by the shaft sleeve 83 and the protective sleeve 85 to prevent the barium sulfate powder from entering the rotating parts and affecting their operation.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A barium sulfate drying device, characterized in that: It comprises a closed cylindrical shell, wherein a drying chamber and a dispersing chamber are sequentially arranged inside the shell from top to bottom, a feed port is opened in the middle of the top of the drying chamber, a receiving groove is arranged in the drying chamber at a position below the feed port, the receiving groove is a conical groove body with a diameter decreasing from top to bottom, an upwardly protruding material distributor is arranged at the center of the receiving groove, the material distributor is a cone structure with a tip facing upward, a plurality of first nozzles are buried at the bottom of the material distributor in the direction corresponding to the inner wall of the receiving groove, the first nozzles are evenly distributed at equal intervals and arranged to be tilted upward, and the first nozzles are connected to a hot air blower located outside the shell through an air supply pipe; The bottom of the drying chamber is contracted and connected to the dispersion chamber. The dispersion chamber is a vertical cylindrical structure. A spiral dispersion channel is arranged inside the dispersion chamber. The spiral dispersion channel includes a vertical partition net and a spiral blade arranged inside the partition net. The partition net is a cylindrical structure with a diameter smaller than the inner diameter of the dispersion chamber. The spiral blade is an integrated structure and is arranged in the partition net from top to bottom, so that the material descends in a spiral shape along the spiral blade. A discharge port is opened at the bottom of the drying chamber.

2. A barium sulfate drying device as claimed in claim 1, characterized in that: A positioning cylinder is arranged at the bottom of the feed port. The positioning cylinder is a vertical cylinder structure which is thick at the top and thin at the bottom. Both ends of the positioning cylinder are open, the top end is connected to the feed port, and the bottom end is just toward the center position of the receiving groove.

3. A barium sulfate drying device as claimed in claim 2, characterized in that: The bottom end of the positioning cylinder is also provided with a dispersion net.

4. A barium sulfate drying device as claimed in claim 3, characterized in that: A plurality of second nozzles are arranged around the top edge of the positioning cylinder, the second nozzles are closely attached to the inner wall of the positioning cylinder and face downward along the inner wall of the positioning cylinder where they are located, the outer end of the positioning cylinder is connected to a circulating air pipe, the other end of the circulating air pipe extends from the outside of the shell to the bottom position of the corresponding receiving groove, and then penetrates into the shell so that the air inlet end of the circulating air pipe is just at the bottom of the receiving groove, and an air pump is also provided on the circulating air pipe.

5. A barium sulfate drying device as claimed in claim 1, characterized in that: The receiving groove is a semi-ellipsoidal shell structure, and its surface is an outwardly convex arc surface. A plurality of friction lines are also arranged on the inner wall of the receiving groove. The friction lines are outwardly convex lines and are inclined arc structures.

6. A barium sulfate drying device as claimed in claim 1, characterized in that: The first nozzle is arranged to be tilted upward toward the inner wall of the receiving groove in the vertical direction, and tilted away from the radial direction of the receiving groove in the horizontal direction, so that the gas sprayed by the first nozzle forms a spiral upward airflow around the inner wall of the receiving groove inside the receiving groove.

7. A barium sulfate drying device as claimed in claim 1, characterized in that: A branch air pipe is buried at a position corresponding to the first nozzle inside the distribution head. The branch air pipe is a star-shaped scattering structure, and its center position corresponds to the central axis of the distribution head, and then is scatteredly connected to each first nozzle. The air supply pipe extends through the shell to the center position of the bottom of the receiving groove, and then extends upward through the receiving groove into the distribution head and is connected to the center position of the branch air pipe.

8. A barium sulfate drying device as claimed in claim 1, characterized in that: The separation net is provided with a resistance wire so that the separation net can be electrically heated.

9. A barium sulfate drying device as claimed in claim 1, characterized in that: A disperser is also provided at the bottom of the spiral dispersion channel, and the disperser includes a rotating shaft coaxially arranged at the bottom end of the dividing net, and horizontal scattering blades are arranged on the rotating shaft. A motor is provided outside the shell to drive the rotating shaft to rotate, so that the scattering blades rotate to scatter the materials passing by when falling.

10. A barium sulfate drying device as claimed in claim 9, characterized in that: A closed shaft sleeve is arranged on the outside of the rotating shaft, and both ends of the rotating shaft extend out of the shaft sleeve and are connected to the scattering blades. A protective sleeve is vertically connected to the middle of the shaft sleeve, and the protective sleeve is linked to the inside of the dispersion chamber to fix the rotating shaft. A transmission rod is rotatably arranged inside the protective sleeve, one end of the transmission rod extends into the inside of the shaft sleeve, and the other end extends to the outside of the shell corresponding to the dispersion chamber. Both ends of the transmission rod are respectively connected to the motor and the rotating shaft, so that the motor drives the rotation of the rotating shaft and the scattering blades.

Images