Method for preparing anhydrous sodium sulphate through acid bath evaporation

Abstract

The invention discloses a method for preparing anhydrous sodium sulphate by acid bath evaporation, which is used for evaporative crystallization of acid bath, and comprises a crystallization barrel, the outer wall of the crystallization barrel is fixedly sleeved with a bracket, a feed port is arranged in the left barrel body of the crystallization barrel, an exhaust pipe is communicated in the right barrel body of the crystallization barrel, and a circular plate is fixed on the inner wall of the crystallization barrel. A filter plate is arranged below the circular plate; the device further comprises a driving assembly; a synchronization component; and a collision assembly. According to the crystal crushing device, to-be-discharged crystals are crushed through rotation of the driving shaft and rotation of the crushing blades, the driving shaft rotates to drive a columnar block on the outer ring of the driving shaft to rotate, and a roller swings in a channel in the columnar block, so that swinging of a long plate is adjusted, and a polished rod fixedly sleeved with the long plate is driven to synchronously rotate in a reciprocating mode; the flapping block flaps the extension plate at the bottom of the filter plate, and the plates collide with one another to generate vibration, so that the crystals which are crushed above the filter plate and meet the discharging requirement are discharged through the leakage holes of the filter plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of preparing sodium sulfate, in particular to a method for preparing sodium sulfate by acid bath evaporation. BACKGROUND

[0002] Sodium sulfate, commonly known as sodium sulfate, is an important industrial raw material, which is stable in chemical properties and widely distributed in nature. In the production process of viscose fiber, the recovery of acid bath includes acid bath evaporation and acid bath crystallization. In the spinning process, due to the continuous increase of water and sodium sulfate, the volume of acid bath is continuously expanded. Therefore, the excess water must be removed by evaporation, and the excess sodium sulfate must be separated by crystallization to maintain the balance of the acid bath. There are many chemical fiber factories in China. At present, only a few viscose factories recover acid bath. For a viscose factory with an annual output of 10,000 tons, about 35m 3 of acid bath is discharged every day. The acid bath contains about 25% (w%) sodium sulfate and 8% sulfuric acid. In order to protect the environment, sodium sulfate in the acid bath pretreatment liquid needs to be recovered. Direct preparation of sodium sulfate from acid bath is to evaporate and crystallize the acid bath, so that the sodium sulfate in the acid bath is in a supersaturated state, and the saturated solution of sodium sulfate precipitates sodium sulfate crystals-sodium sulfate.

[0003] The existing evaporation and crystallization device is relatively simple in the method of treating the precipitated crystals. The precipitated crystals are directly taken out. However, the crystals at this time may be in block shape and have large volume, which occupies a certain space for storage. Therefore, the crystals after discharge still need to be treated secondly, which leads to relatively complicated steps of the whole crystal treatment and relatively high consumption of energy.

[0004] Therefore, it is necessary to invent a method for preparing sodium sulfate by acid bath evaporation to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a method for preparing sodium sulfate by acid bath evaporation, so as to solve the problems of the existing evaporation and crystallization device in the method of treating the precipitated crystals, which are relatively simple, directly taking out the precipitated crystals, but the crystals at this time may be in block shape and have large volume, which occupies a certain space for storage, so that the crystals after discharge still need to be treated secondly, which leads to relatively complicated steps of the whole crystal treatment and relatively high consumption of energy.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme: a method for preparing sodium sulfate by acid bath evaporation, which is used for evaporation and crystallization of acid bath, and includes a crystallization barrel, a support is fixedly sleeved with the outer wall of the crystallization barrel, an inlet is arranged in the left barrel body of the crystallization barrel, an exhaust pipe is communicated with the right barrel body of the crystallization barrel, a circular plate is fixedly arranged on the inner wall of the crystallization barrel, and a filter plate is arranged below the circular plate, and the method further includes:

[0007] A driving assembly, a motor is fixedly connected to the top wall of the crystallization barrel, an output shaft of the motor is drivingly connected with a driving shaft, a linkage shaft is arranged beside the driving shaft, and stirring blades I are fixedly sleeved on the outer circle of the driving shaft and the linkage shaft;

[0008] A synchronous assembly, gears are fixedly sleeved on the outer walls of the driving shaft and the linkage shaft, the gears are meshingly connected with a tooth ring, the tooth ring is movably arranged in an annular groove in the crystallization barrel, and a scraper is fixedly connected to the bottom of the tooth ring;

[0009] A collision assembly, a columnar block is fixedly sleeved on the outer wall of the driving shaft, a channel is formed in the columnar block, a roller is slidingly connected in the channel, a short rod is fixedly sleeved in the inner circle of the roller, a long plate is movably sleeved on the outer wall of the short rod, a light rod is fixedly sleeved in the long plate, and a beating block is fixedly sleeved on the outer circle of the light rod;

[0010] The method specifically comprises the following steps:

[0011] Step one, the pretreated acid bath solution is added into the crystallization barrel through the feeding port, and then the feeding port is closed;

[0012] Step two, the crystallization is stirred, the crystallization barrel is heated, then the motor is started to drive the driving shaft to rotate, and then the stirring blades I fixedly sleeved on the outer circle of the driving shaft are driven to rotate to stir the material, and the stirring blades I fixedly sleeved on the outer circle of the linkage shaft are driven to rotate to stir the material under the driving of the plurality of gears;

[0013] Step three, the separated crystals fall on the filter plate through the discharge valve embedded in the circular plate, the rotation of the driving shaft drives the rotation of the crushing blade to crush the crystals to be discharged on the filter plate, the driving shaft synchronously drives the rotation of the columnar block, the columnar block drives the rotation of the beating block fixedly sleeved on the outer circle of the light rod to beat the extension plate, the collision between the plates generates vibration, and the crystals which are crushed and meet the discharge requirements on the filter plate are discharged through the leakage hole of the filter plate.

[0014] Preferably, the number of the linkage shafts is two, the two linkage shafts are symmetrically distributed on the two sides of the driving shaft with the driving shaft as the symmetry axis, and the top end portions of the linkage shafts are rotatably connected with the top wall of the crystallization barrel through bearings.

[0015] Preferably, the number of the gears is three, the three gears are completely same, the three gears are fixedly sleeved on the outer circle of the driving shaft and the two linkage shafts, the gears fixedly sleeved on the outer wall of the driving shaft and the gears fixedly sleeved on the outer circle of the two linkage shafts are meshingly connected, and the gears fixedly sleeved on the outer walls of the two linkage shafts are meshingly connected with the tooth blocks in the inner wall of the tooth ring.

[0016] The scraper is provided in two pieces, and the two pieces are symmetrically arranged, one side wall of each of the two pieces is in contact with the inner wall of the crystallizing barrel, the end of the scraper in contact with the inner wall of the crystallizing barrel is in a sharp corner shape, and the scraper is made of high-temperature-resistant silica gel.

[0017] The three groups of stirring blades are distributed in a staggered manner.

[0018] Preferably, the circular plate is internally provided with two groups of symmetric through holes, and the through holes are internally provided with discharge valves.

[0019] The circular plate is internally rotatably connected with the driving shaft and the linkage shaft through bearings.

[0020] Preferably, the cylindrical block is fixedly sleeved on the shaft body outside the driving shaft below the filter plate, the groove in the cylindrical block is annular, the difference between the fluctuation degrees of the upper and lower ends of the groove is less than the height of the radius of the roller, the outer wall of the roller is in abutment with and slidably connected with the inner wall of the groove.

[0021] Preferably, the short rod is rotatably connected with the long plate at the end away from the roller through a bearing.

[0022] Preferably, the two ends of the polished rod are rotatably connected with the inner wall of the crystallizing barrel through bearings.

[0023] The upper end of the beating block is in contact with the fixed extension plate at the lower end of the filter plate.

[0024] In the above technical solution, the present application has the following technical effects and advantages:

[0025] 1. The motor drives the driving shaft to rotate, the gear fixedly sleeved on the outer ring of the driving shaft is in meshing connection with the gear fixedly sleeved on the outer ring of the linkage shaft, thereby driving the linkage shaft to rotate, at this time, the linkage shaft and the stirring blade I fixedly sleeved on the outer ring of the driving shaft rotate in different directions synchronously to stir the materials in the crystallizing barrel, facilitating crystallization, and in the rotating process of the gear on the outer ring of the linkage shaft, the gear ring in meshing connection with the gear on the outer ring of the linkage shaft is driven to rotate, and in the rotating process of the gear ring, the scraper fixedly connected to the lower end of the gear ring scrapes the crystals on the inner wall of the crystallizing barrel.

[0026] 2, drive shaft rotation, drive shaft fixed outside the crushing blade to the discharge of the crystal, drive shaft rotation drive shaft outside the columnar block rotation, the roller in the columnar block inside the channel swing, and then mobilize the swing of the long plate, drive the long plate fixed sleeve light pole synchronous reciprocating rotation, light pole outside the circle block synchronous swing hit the filter plate bottom fixed extension plate, plate and plate between the collision produces vibration, so that the filter plate above the crushing completed and meet the discharge requirements of the crystal through the filter plate leakage hole discharge, the whole process is completed through the rotation of the drive shaft, and the first time the crystal is crushed and discharged at the same time with the second material crystallization process can be synchronized, so as to save energy and improve the overall work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0028] Figure 1 is the overall structure of the present application;

[0029] Figure 2 is the first perspective view of the crystallization barrel (partially cut state) of the present application;

[0030] Figure 3 is the second perspective view of the crystallization barrel (partially cut state) of the present application;

[0031] Figure 4 is an explosion view of the columnar block and the roller of the present application;

[0032] Figure 5 is an explosion view of the synchronous assembly and the crystallization barrel of the present application.

[0033] Explanation of reference signs:

[0034] 1, crystallization barrel; 2, support; 3, inlet; 4, exhaust pipe; 5, round plate; 51, discharge valve; 6, drive assembly; 61, motor; 62, drive shaft; 63, linkage shaft; 64, synchronous assembly; 641, gear; 642, gear ring; 643, annular groove; 644, scraper; 65, stirring blade one; 7, filter plate; 8, stirring blade two; 9, crushing blade; 10, collision assembly; 101, columnar block; 102, channel; 103, roller; 104, short rod; 105, long plate; 106, light pole; 107, hitting block; 108, extension plate. DETAILED DESCRIPTION

[0035] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0036] The present application provides a method for preparing guanidium sulfate as shown in Figures 1-5 The present application provides a method for preparing guanidium sulfate as shown in

[0037] The driving assembly 6 is fixedly connected with the motor 61 on the top wall of the crystallization barrel 1, and the output shaft of the motor 61 is drivingly connected with the driving shaft 62, and the driving shaft 62 is provided with the linkage shaft 63 on the side thereof, and the outer circle of the driving shaft 62 and the linkage shaft 63 is fixedly sleeved with the stirring blade one 65;

[0038] The synchronous assembly 64 is fixedly sleeved with the gear 641 on the outer wall of the driving shaft 62 and the linkage shaft 63, and the gear 641 is meshingly connected with the tooth ring 642, the tooth ring 642 is movably arranged in the annular groove 643 inside the crystallization barrel 1, and the bottom of the tooth ring 642 is fixedly connected with the scraper 644;

[0039] The collision assembly 10 is fixedly sleeved with the columnar block 101 on the outer wall of the driving shaft 62, and the columnar block 101 is provided with the channel 102 inside, and the roller 103 is slidingly connected in the channel 102, the inner circle of the roller 103 is fixedly sleeved with the short rod 104, the outer wall of the short rod 104 is movably sleeved with the long plate 105, and the inner part of the long plate 105 is fixedly sleeved with the light rod 106, and the outer circle of the light rod 106 is fixedly sleeved with the beating block 107;

[0040] The method is as follows:

[0041] Step one, the pretreated acid bath solution is added into the crystallization barrel 1 through the feeding port 3, and then the feeding port 3 is closed;

[0042] Step two, stirring crystallization, the crystallization barrel 1 is heated, and then the motor 61 is started to drive the driving shaft 62 to rotate, thereby driving the stirring blade one 65 fixedly sleeved on the outer circle of the driving shaft 62 to rotate and stir the material, and under the driving action of the plurality of gears 641, the stirring blade one 65 fixedly sleeved on the outer circle of the linkage shaft 63 is driven to stir the material;

[0043] Step three, the precipitated crystals fall on the filter plate 7 through the discharge valve 51 embedded in the inside of the circular plate 5, the rotation of the driving shaft 62 drives the rotation of the crushing blade 9 to crush the crystals to be discharged on the filter plate 7, at the same time, the driving shaft 62 synchronously drives the rotation of the cylindrical block 101, the cylindrical block 101 drives the rotation of the beating block 107 fixed on the outer circle of the light rod 106, and the beating block 107 beats the extension plate 108, the collision between the plates produces vibration, so that the crystals on the filter plate 7 which are crushed and meet the discharge requirements are discharged through the leakage hole of the filter plate 7.

[0044] The number of linkage shafts 63 is two, and the two linkage shafts 63 are symmetrically distributed on the two sides of the driving shaft 62 with the driving shaft 62 as the axis of symmetry, and the top end of the linkage shaft 63 is rotatably connected with the top wall of the crystallization barrel 1 through a bearing.

[0045] The number of gears 641 is three, the three gears 641 are completely the same, and the three gears 641 are fixedly sleeved on the outer circles of the driving shaft 62 and the two linkage shafts 63, and the gears 641 fixedly sleeved on the outer walls of the driving shaft 62 and the two linkage shafts 63 are all meshingly connected, the gears 641 fixedly sleeved on the outer walls of the two linkage shafts 63 are meshingly connected with the tooth blocks on the inner wall of the tooth ring 642, the rotation of the driving shaft 62 drives the rotation of the gears 641 fixedly sleeved on the outer circle of the driving shaft 62, the gears 641 fixedly sleeved on the outer circles of the two linkage shafts 63 are meshingly connected, and then synchronously drive the different directions of the two linkage shafts 63 to rotate;

[0046] The number of scrapers 644 is two, and the two scrapers 644 are symmetrically arranged, and the two scrapers 644 are both in contact with the inner wall of the crystallization barrel 1, and the end of the scraper 644 in contact with the inner wall of the crystallization barrel 1 is in the form of an acute angle, the scraper 644 is made of high-temperature-resistant silica gel, the gears 641 fixedly sleeved on the outer circles of the linkage shafts 63 are meshingly connected with the tooth ring 642 to drive the rotation of the tooth ring 642, and then drive the rotation of the two groups of scrapers 644 to scrape the crystals in the inner wall of the crystallization barrel 1;

[0047] The number of stirring blades one 65 is three, and the three stirring blades one 65 are fixedly sleeved on the outer walls of the driving shaft 62 and the linkage shaft 63, and the three stirring blades one 65 are staggered to facilitate the synchronous rotation of the three stirring blades one 65 in different directions to stir the materials in the crystallization barrel 1.

[0048] Two groups of symmetrical through holes are formed in the inside of the circular plate 5, and the through holes are both installed with discharge valves 51 to facilitate the falling of the precipitated crystals on the filter plate 7, and then the secondary treatment is convenient for subsequent final discharge;

[0049] The inside of the circular plate 5 is rotatably connected with the driving shaft 62 and the linkage shaft 63 through bearings.

[0050] The cylindrical block 101 is fixedly sleeved on the shaft body outer wall of the drive shaft 62 below the filter plate 7, and the groove 102 in the cylindrical block 101 is annular, and the difference between the up and down end portions of the groove 102 is less than the radius height of the roller 103, the outer wall of the roller 103 is attached to the inner wall of the groove 102 and is in sliding connection.

[0051] The short rod 104 is rotatably connected with the long plate 105 through a bearing at the end portion away from the roller 103.

[0052] Both end portions of the light rod 106 are rotatably connected with the inner wall of the crystallization barrel 1 through bearings;

[0053] The upper end portion of the beating block 107 is in contact with the extension plate 108 fixedly connected with the lower end portion of the filter plate 7, in the process of synchronous rotation of the cylindrical block 101 with the drive shaft 62, the roller 103 swings along the annular groove 102 with certain undulations in the cylindrical block 101, and then the swing of the long plate 105 is adjusted, and the light rod 106 is synchronously rotated, and the beating block 107 fixedly sleeved on the outer ring of the light rod 106 swings in the process of rotation of the light rod 106, and beats the extension plate 108 fixedly connected with the bottom of the filter plate 7.

[0054] Working principle: first, start the motor 61 to drive the drive shaft 62 connected with the output shaft of the motor 61 to rotate, the stirring blade one 65 fixedly sleeved on the outer ring of the drive shaft 62 is synchronously rotated to stir the materials in the crystallization barrel 1, the gear 641 fixedly sleeved on the outer ring of the drive shaft 62 is in meshing connection with the gear 641 fixedly sleeved on the outer ring of the two linkage shafts 63, and then the linkage shafts 63 are driven to rotate, at this time, the stirring blade one 65 fixedly sleeved on the outer ring of the linkage shafts 63 is synchronously rotated, and the three stirring blades one 65 are synchronously rotated to fully stir the materials in the crystallization barrel 1, at the same time, the gear 641 on the outer ring of the linkage shaft 63 is in meshing connection with the tooth ring 642, the rotation of the gear 641 on the outer ring of the linkage shaft 63 drives the rotation of the tooth ring 642, and the two scraping plates 644 fixedly connected with the bottom of the tooth ring 642 are rotated to scrape the crystals generated on the inner wall of the crystallization barrel 1;

[0055] After the crystallization is fully generated, the two discharge valves 51 inside the circular plate 5 are opened, at this time the crystal is dropped on the filter plate 7 through the discharge valve 51, with the continuous rotation of the driving shaft 62, the crushing blade 9 fixedly sleeved on the outer circle of the driving shaft 62 is rotated to crush the crystal dropped on the filter plate 7, which is convenient for the subsequent reprocessing of the crystal, and at the same time, the crystal meeting the discharge requirement is discharged through the leakage hole of the filter plate 7, in the process of discharging the crystal, the rotation of the driving shaft 62 drives the rotation of the cylindrical block 101 fixedly sleeved on the outer circle of the driving shaft 62, in the process of rotation of the cylindrical block 101, the roller 103 slidingly connected inside the cylindrical block 101 swings along the annular groove 102 inside the cylindrical block 101, which has a certain fluctuation, and then the swing of the long plate 105 is mobilized, the light rod 106 is fixedly sleeved in the end portion of the long plate 105 away from the cylindrical block 101 at this time, the light rod 106 is synchronously reciprocatingly rotated, the beating block 107 fixedly sleeved on the outer circle of the light rod 106 beats the extension plate 108 fixedly arranged at the bottom of the filter plate 7 in the process of swinging along with the rotation of the light rod 106, the collision between the plates produces vibration, so that the crystal meeting the discharge requirement on the filter plate 7 is discharged through the leakage hole of the filter plate 7, in the process of rotation of the driving shaft 62, the linkage shaft 63 is always rotating, the stirring blade two 8 fixedly arranged at the lower end of the linkage shaft 63 stirs the crystal in the process of crushing to be discharged, which is convenient for the rapid crushing of the crystal and the subsequent discharge.

[0056] The foregoing merely describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the foregoing drawings and descriptions are illustrative in nature, and should not be construed as limiting the scope of protection of the claims of the present application.

Claims

1. A method for preparing sodium sulfate by acid bath evaporation, which is used for acid bath evaporation crystallization, comprising a crystallization barrel (1), characterized in that: The outer wall of the crystallization barrel (1) is fixedly sleeved with a bracket (2), a feed port (3) is provided in the barrel body on the left side of the crystallization barrel (1), an exhaust pipe (4) is connected to the barrel body on the right side of the crystallization barrel (1), a circular plate (5) is fixed on the inner wall of the crystallization barrel (1), and a filter plate (7) is provided below the circular plate (5), and further comprises: A drive assembly (6), wherein the top wall of the crystallization barrel (1) is fixedly connected to a motor (61), and the output shaft of the motor (61) is transmission-connected to a drive shaft (62), and a linkage shaft (63) is arranged on the side of the drive shaft (62), and the outer rings of the drive shaft (62) and the linkage shaft (63) are both fixedly sleeved with a stirring blade (65); Synchronous component (64), the outer walls of the driving shaft (62) and the linkage shaft (63) are fixedly sleeved with a gear (641), and the gear (641) is meshed with a gear ring (642), the gear ring (642) moves in an annular groove (643) inside the crystallization barrel (1), and a scraper (644) is fixedly connected to the bottom of the gear ring (642); The collision assembly (10) comprises a columnar block (101) fixedly sleeved on the outer wall of the driving shaft (62), a groove (102) being provided in the columnar block (101), a roller (103) being slidably connected in the groove (102), a short rod (104) being fixedly sleeved on the inner ring of the roller (103), a long plate (105) being movably sleeved on the outer wall of the short rod (104), a polished rod (106) being fixedly sleeved in the inner ring of the long plate (105), and a slapping block (107) being fixedly sleeved on the outer ring of the polished rod (106); The method is as follows: Step 1: Add the pretreated acid bath solution into the crystallization barrel (1) through the feed port (3), and then close the feed port (3); Step 2: stirring crystallization. The crystallization barrel (1) is heated, and then the motor (61) is started to drive the driving shaft (62) to rotate, thereby driving the stirring blade (65) fixedly sleeved on the outer ring of the driving shaft (62) to rotate to stir the material. Under the transmission action of multiple sets of gears (641), the stirring blade (65) fixedly sleeved on the outer ring of the linkage shaft (63) is driven to stir the material. Step three, the precipitated crystals fall onto the filter plate (7) through the discharge valve (51) embedded inside the circular plate (5), and the driving shaft (62) drives the rotation of the crushing blade (9) to crush the crystals to be discharged on the filter plate (7). At the same time, the driving shaft (62) synchronously drives the columnar block (101) to rotate, and the columnar block (101) drives the beating block (107) fixedly sleeved on the outer ring of the light rod (106) to beat the extension plate (108). The collision between the plates generates vibration, so that the crystals above the filter plate (7) that have been crushed and meet the discharge requirements are discharged through the leakage hole of the filter plate (7).

2. The method for preparing sodium sulfate by acid bath evaporation according to claim 1, characterized in that: The linkage shafts (63) are provided in two numbers. The two linkage shafts (63) are symmetrically distributed on both sides of the driving shaft (62) with the driving shaft (62) as the symmetry axis, and the top end of the linkage shaft (63) is rotatably connected to the top wall of the crystallization barrel (1) through a bearing.

3. The method for preparing sodium sulfate by acid bath evaporation according to claim 1, characterized in that: The gears (641) are provided in three numbers, and the three gears (641) are identical. The three gears (641) are respectively fixedly sleeved on the driving shaft (62) and the outer rings of the two linkage shafts (63). The gears (641) fixedly sleeved on the outer wall of the driving shaft (62) and the gears (641) fixedly sleeved on the outer rings of the two linkage shafts (63) are meshed and connected. The gears (641) fixedly sleeved on the outer walls of the two linkage shafts (63) are meshed and connected with the tooth blocks on the inner wall of the gear ring (642). There are two scrapers (644) provided, and the two scrapers (644) are symmetrically arranged. Both of the scrapers (644) have a side wall in contact with the inner wall of the crystallization barrel (1). The end of the scraper (644) in contact with the inner wall of the crystallization barrel (1) is pointed. The scraper (644) is made of high-temperature resistant silicone. The stirring blades (65) are provided in three groups in number. The three groups of stirring blades (65) are respectively fixedly sleeved on the outer wall of the driving shaft (62) and the linkage shaft (63), and the three groups of stirring blades (65) are staggered in distribution.

4. The method for preparing sodium sulphate by acid bath evaporation according to claim 1, wherein: Two groups of symmetrical through holes are provided inside the circular plate (5), and discharge valves (51) are installed inside the through holes; The inside of the circular plate (5) is rotatably connected to the drive shaft (62) and the linkage shaft (63) via bearings.

5. The method for preparing sodium sulfate by acid bath evaporation according to claim 1, characterized in that: The columnar block (101) is fixedly sleeved on the outer wall of the shaft of the drive shaft (62) below the filter plate (7), and the groove (102) inside the columnar block (101) is annular, and the height difference between the upper and lower ends of the groove (102) is smaller than the radius height of the roller (103), and the outer wall of the roller (103) and the inner wall of the groove (102) are in contact and slidably connected.

6. The method for preparing sodium sulfate by acid bath evaporation according to claim 1, characterized in that: One end of the short rod (104) away from the roller (103) is rotatably connected to the long plate (105) via a bearing.

7. The method for preparing sodium sulfate by acid bath evaporation according to claim 1, characterized in that: The two ends of the polished rod (106) are rotatably connected to the inner wall of the crystallization barrel (1) via bearings; The upper end of the beating block (107) contacts the extension plate (108) fixed to the lower end of the filter plate (7).

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