A kind of defoaming agent preparation process and preparation equipment for electrolytic aluminum oxide

Abstract

The invention relates to the technical field of electrolytic aluminum oxide production, and specifically to a defoamer preparation process and preparation equipment for electrolytic aluminum oxide, comprising the following steps: step one, preparing raw materials for the defoamer for electrolytic aluminum oxide, wherein the raw materials include, by weight, 4 parts of polyoxyethylene-polyoxypropylene copolymer, 3 parts of polydimethylsiloxane and its derivatives, 1 part of modified mineral oil, and 1 part of surfactant, and the beneficial effects are: by improving the raw materials and proportions of the defoamer, using surfactants and modified mineral oil instead of ethyl cellulose as raw material additives, improving the dispersibility and wettability of the defoamer in the defoaming system, and at the same time, it may play the effect of regulating the interaction between the defoamer and the electrolyte, and can also improve the compatibility and stability of the defoamer, and enhance the defoaming effect of the defoamer in the process of electrolytic aluminum oxide, so as to achieve the purpose of reducing production costs and improving production efficiency by improving the proportion of defoamer raw materials and improving preparation equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of electrolytic aluminum oxide production, and specifically relates to a preparation process and preparation equipment of a defoaming agent for electrolytic aluminum oxide. Background Art

[0002] In order to suppress the generation of foam and eliminate existing foam during the electrolysis of alumina, a special defoamer is needed. The foam generated in the electrolytic cell is mainly caused by the intense chemical reaction during the electrolysis process, gas precipitation and electrolyte stirring. The defoamer can reduce the surface tension of the liquid surface, making the foam liquid film more unstable. When the defoamer molecules are adsorbed onto the foam liquid film, the surface properties of the liquid film are changed, the strength of the liquid film is weakened, the foam is easier to break, and it can penetrate into the liquid film, by reducing the elastic modulus of the liquid film and destroying the integrity of the liquid film, thereby preventing the formation of foam or causing the already formed foam to break. Therefore, the defoamer can eliminate excessive foam in the electrolyte and reduce the gas obstruction caused by the foam, making the electrolysis process smoother and improving the current efficiency and production capacity. Therefore, the production of defoamers is very necessary.

[0003] In the prior art, a Chinese patent document entitled "A high-temperature stable defoamer composition and a preparation method thereof" with a publication number of CN104548676A and a publication date of April 29, 2015 has been proposed. The defoamer is prepared using polyborosiloxane, ethyl cellulose, glycerol-type dendritic polyether, vinyl-containing polysilazane and higher fatty alcohol as main raw materials. However, since ethyl cellulose and some higher fatty alcohols have high cost prices and ethyl cellulose is insoluble in cold water and can only be dissolved in organic solvents such as alcohols, ketones, esters and aromatic hydrocarbons, its application in certain water-based systems is limited, and its effect as a defoamer for electrolytes is generally average.

[0004] In the prior art, a Chinese patent document with the patent name of "A high-efficiency chemical defoaming agent production and preparation equipment", publication number CN114950253A, and publication date of August 30, 2022" has also been proposed. The equipment can be unblocked by the joint action of an electric motor, end cover, nozzle, high-pressure pipe and high-pressure water pump to avoid the equipment from being blocked and unable to be automatically unblocked. However, the residual raw materials will first enter the filter box through the holes for filtration, which can easily cause blockage inside the filter box. The filter screen will need to be cleaned later, which is not convenient to use.

[0005] Therefore, the present invention proposes a defoaming agent preparation process and preparation equipment for electrolytic alumina, which solves the problems of high defoaming agent preparation cost and inconvenient use of preparation equipment in the prior art. The purpose of reducing production cost and improving production efficiency can be achieved by improving the ratio of defoaming agent raw materials and improving the preparation equipment. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a defoaming agent preparation process and preparation equipment for electrolytic alumina to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a process for preparing a defoaming agent for electrolytic alumina, comprising the following steps:

[0008] Step 1, preparing raw materials for preparing electrolytic alumina defoaming agent, wherein the raw materials include, by weight: 4 parts of polyoxyethylene-polyoxypropylene copolymer, 3 parts of polydimethylsiloxane and its derivatives, 1 part of modified mineral oil, and 1 part of surfactant;

[0009] Step 2, mixing the raw materials of the electrolytic alumina defoamer, and adding an emulsifying agent for mixing, wherein the emulsifying agent is a mixture of a base polymer, an emulsifier, a stabilizer, a dispersant and a functional additive, the base polymer is polysiloxane, the functional additive is mineral oil, and the emulsifying agent includes, by weight: 3 parts of polysiloxane, 1.5 parts of emulsifier, 0.2 parts of stabilizer, 0.5 parts of dispersant, and 0.5 parts of mineral oil;

[0010] Step 3, using a defoaming agent preparation device for electrolytic alumina to fully stir the raw materials, and use distilled water as a solvent for emulsification to form a stable emulsion, wherein 8 parts of distilled water are required by weight, the stirring temperature is 50° C., the mixing stirring rate is 600 rpm, the emulsification temperature is 30° C., the emulsification stirring rate is 200 rpm, the mixing stirring time is 10 min, and the emulsification stirring time is 30 min to form a stable emulsion;

[0011] Step 4: After the defoaming agent for electrolytic alumina is prepared, it is filtered and discharged for filling, and the equipment for preparing the defoaming agent for electrolytic alumina is cleaned to remove impurities remaining in the equipment.

[0012] The present invention also proposes a defoaming agent preparation device for electrolytic alumina, comprising a defoaming agent preparation device housing, a sealing cover is provided at the upper end of the defoaming agent preparation device housing, an emulsification inner tank assembly is provided inside the defoaming agent preparation device housing, an emulsification stirring assembly is provided inside the emulsification inner tank assembly, a filtering assembly is provided at the bottom of the emulsification inner tank assembly, the emulsification inner tank assembly comprises an emulsification inner tank fixedly mounted on the inner surface of the defoaming agent preparation device housing, the emulsification stirring assembly comprises a driving motor fixedly mounted on the top of the sealing cover, a stirring rod is fixedly mounted on the output shaft of the driving motor, and the filtering assembly comprises a closing ring and a filter cover.

[0013] Preferably, a defoaming agent discharge pipe is provided at the bottom of the emulsification inner tank, a residue discharge pipe is fixedly installed under the side wall of the emulsification inner tank, control valves are provided inside the defoaming agent discharge pipe and the residue discharge pipe, a constant temperature heating chamber is provided between the outer side of the emulsification inner tank and the inner side of the outer shell of the defoaming agent preparation equipment, a sealing ring is sleeved on the inner side of the welding point between the emulsification inner tank and the side wall of the outer shell of the defoaming agent preparation equipment, a heating pipe is fixedly installed on the left side wall of the outer shell of the defoaming agent preparation equipment, and a circulating water pipe is fixedly installed on the right side wall of the outer shell of the defoaming agent preparation equipment.

[0014] Preferably, the emulsification inner tank is an hourglass structure, the stirring rod is rotatably installed in the middle of the emulsification inner tank, a disc-type stirring impeller is fixedly installed above the outer surface of the stirring rod, and a material guiding spiral blade is fixedly installed at the bottom of the stirring rod, and the material guiding spiral blade is arranged above the inside of the defoaming agent discharge pipe.

[0015] Preferably, an active magnetic ring is fixedly installed in the middle of the outer surface of the stirring rod, a driven magnetic ring is arranged on the outer side of the active magnetic ring, and the driven magnetic ring is rotatably installed on the middle inner surface of the emulsification inner tank, a shear stirring blade fixing ring is fixedly installed below the outer surface of the stirring rod, a first shear stirring blade is hingedly installed on the outer surface of the shear stirring blade fixing ring, and a second shear stirring blade is hingedly installed on the inner surface of the driven magnetic ring, and six groups of the second shear stirring blades are evenly and symmetrically distributed with the first shear stirring blades.

[0016] Preferably, a first spring rod is arranged between the inner surface of the first shear stirring blade and the outer surface of the shear stirring blade fixing ring, a hinged spring connecting rod is movably installed between the outer surface of the second shear stirring blade and the inner surface of the driven magnetic ring, and the inner wall of the first shear stirring blade is provided with a movable slot adapted to the second shear stirring blade.

[0017] Preferably, the outer surface of the closed ring is fixedly installed at an angle below the inner surface of the emulsifying inner tank, a filter cover is movably installed above the closed ring, and the lower surface of the filter cover is provided with an annular groove adapted to the closed ring.

[0018] Preferably, a filter screen is fixedly installed in the middle of the filter cover, the inner wall of the filter screen is slidably connected to the outer surface of the stirring rod, and a threaded sleeve is fixedly installed on the lower surface of the filter screen, and the inner surface of the threaded sleeve is rotationally connected to the outer surface of the stirring rod through a thread.

[0019] Preferably, a limiting ring is provided below the closed ring, the limiting ring is fixedly mounted on the inner surface of the emulsifying inner tank, a Z-type limiting frame is fixedly mounted above the limiting ring, and the outer side wall of the threaded sleeve is provided with a limiting groove adapted to the Z-type limiting frame.

[0020] Preferably, a sealing cover ring is provided on the outside of the filter cover, the outer surface of the sealing cover ring is fixedly connected to the inner surface of the emulsification inner tank, the outer wall of the filter cover is truncated, and the inner wall of the sealing cover ring matches the curvature of the outer wall of the filter cover.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] By improving the raw materials and proportions of the defoamer, using surfactants and modified mineral oil instead of ethyl cellulose as raw material additives, the dispersibility and wettability of the defoamer in the defoaming system can be improved, and at the same time, the interaction between the defoamer and the electrolyte can be adjusted, and the compatibility and stability of the defoamer can be improved, thereby enhancing the defoaming effect of the defoamer in the electrolytic alumina process;

[0023] The defoamer preparation equipment for electrolytic alumina is composed of a defoamer preparation equipment shell, an emulsification inner tank component, an emulsification stirring component and a filtering component. The special shape of the emulsification inner tank allows the raw materials to be rotated by a disc stirring impeller after being added. The special airfoil design of the disc stirring impeller allows the flow field generated during stirring to effectively stir the materials and improve the mixing uniformity of the materials. The edge is designed to be thin and can generate a strong shear force to fully disperse the materials. It can generate a vortex flow during rotation, which helps the materials to pass through the middle of the emulsification inner tank and enter the mixing space below. The stirring rod drives the shear stirring blade fixing ring and the active magnetic ring to rotate, and uses the principle of magnetic coupling to drive the driven magnetic ring to rotate, so that the first shear stirring blade and the second shear stirring blade are dispersed and spread from the top and bottom respectively under the action of centrifugal force, and have a strong axial and radial mixing effect, so that the raw materials can be fully emulsified and mixed in a short time without stratification;

[0024] By using a closed ring in conjunction with a filter hood, after the filter hood filters the defoamer emulsion, the stirring rod rotates in the opposite direction to move the filter hood downward, making it easier for the residue after filtration to be discharged through a residue discharge pipe on the outside of the closed ring. This solves the problems of high defoamer preparation cost and inconvenient use of preparation equipment in the prior art. The purpose of reducing production cost and improving production efficiency can be achieved by improving the ratio of defoamer raw materials and improving the preparation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the top view of the shell of the defoaming agent preparation equipment of the present invention;

[0026] Figure 2 This is a schematic diagram of the front view structure of the shell of the defoaming agent preparation equipment of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal structure of the shell of the defoaming agent preparation equipment of the present invention;

[0028] Figure 4This is a schematic diagram of the cross-sectional structure of the shell of the defoaming agent preparation equipment of the present invention;

[0029] Figure 5 It is a schematic diagram of the cross-sectional structure of the emulsification inner tank assembly in a mixed state of the present invention;

[0030] Figure 6 This is a schematic diagram of the mixing state structure of the emulsifying stirring assembly of the present invention;

[0031] Figure 7 It is a schematic diagram of the structure of the active magnetic ring and the driven magnetic ring of the present invention;

[0032] Figure 8 It is a schematic diagram of the cross-sectional structure of the emulsification inner tank assembly of the present invention in the slag discharge state;

[0033] Fig. 9 This is a schematic diagram of the structure of the emulsifying and stirring assembly in the slag discharge state of the present invention;

[0034] Fig.10 It is a schematic diagram of the stirring rod structure of the present invention;

[0035] Fig.11 It is a schematic diagram of the structure of the disc-type stirring impeller of the present invention;

[0036] Fig.12 This is a schematic diagram of the split structure of the filter assembly of the present invention;

[0037] Fig.13 It is a schematic diagram of the structure of the limiting ring of the present invention;

[0038] Fig.14 The present invention is a schematic diagram of the process flow of preparing a defoaming agent for electrolytic alumina.

[0039] In the figure: 1. shell of defoamer preparation equipment; 11. sealing cover; 2. emulsification inner tank assembly; 21. emulsification inner tank; 211. defoamer discharge pipe; 212. residue discharge pipe; 22. constant temperature heating chamber; 23. sealing ring; 24. circulating water pipe; 25. heating pipe; 3. emulsification stirring assembly; 31. driving motor; 32. stirring rod; 33. disc stirring impeller; 34. active magnetic ring; 35. shear stirring blade fixing ring; 351. first shear stirring blade; 352. first spring rod; 36. driven magnetic ring; 361. second shear stirring blade; 362. hinged spring connecting rod; 37. material guiding spiral blade; 4. filtering assembly; 41. closing ring; 42. filtering cover; 421. filtering net; 422. threaded sleeve; 43. sealing cover ring; 44. limiting ring; 441. Z-type limiting frame. DETAILED DESCRIPTION

[0040] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Embodiment 1

[0042] See also Fig.14 The present invention provides a technical solution: a process for preparing a defoaming agent for electrolytic alumina, comprising the following steps:

[0043] Step 1, preparing raw materials for preparing electrolytic alumina defoaming agent, wherein the raw materials include, by weight: 4 parts of polyoxyethylene-polyoxypropylene copolymer, 3 parts of polydimethylsiloxane and its derivatives, 1 part of modified mineral oil, and 1 part of surfactant;

[0044] Step 2, mixing the raw materials of the electrolytic alumina defoamer, and adding an emulsifying agent for mixing, wherein the emulsifying agent is a mixture of a base polymer, an emulsifier, a stabilizer, a dispersant and a functional additive, the base polymer is polysiloxane, the functional additive is mineral oil, and the emulsifying agent includes, by weight: 3 parts of polysiloxane, 1.5 parts of emulsifier, 0.2 parts of stabilizer, 0.5 parts of dispersant, and 0.5 parts of mineral oil;

[0045] Step 3, using a defoaming agent preparation device for electrolytic alumina to fully stir the raw materials, and use distilled water as a solvent for emulsification to form a stable emulsion, wherein 8 parts of distilled water are required by weight, the stirring temperature is 50° C., the mixing stirring rate is 600 rpm, the emulsification temperature is 30° C., the emulsification stirring rate is 200 rpm, the mixing stirring time is 10 min, and the emulsification stirring time is 30 min to form a stable emulsion;

[0046] Step 4: After the defoaming agent for electrolytic alumina is prepared, it is filtered and discharged for filling, and the equipment for preparing the defoaming agent for electrolytic alumina is cleaned to remove impurities remaining in the equipment.

[0047] In this embodiment, the polyether polyoxyethylene polyoxypropylene copolymer mainly provides good water dispersibility, foam suppression and a long foam suppression cycle, has excellent defoaming performance, high temperature resistance, alkali resistance and does not interfere with the electrolysis process. The silicone derivative polydimethylsiloxane and its derivatives have extremely low surface tension, can quickly penetrate into the foam film to break the foam, and give the defoamer excellent defoaming ability. The modified mineral oil, as an auxiliary defoaming and foam suppression component, can improve the compatibility and stability of the product. The surfactant nonionic or specially modified anionic and cationic surfactants are used to improve the dispersibility and wettability of the defoamer in the foaming system, and may also play a role in regulating the defoaming. The effect of the interaction between the defoamer and the electrolyte, the emulsifier is used to convert water-insoluble organic matter into a stable emulsion, the stabilizer can ensure the stable performance of the defoamer during storage and use, and prevent stratification or failure, the dispersant helps the defoamer to disperse quickly and evenly in the foaming system, and mineral oil is used as a functional additive to enhance the shear stability of the defoamer. These raw materials improve the defoaming performance of the defoamer while reducing the production cost, solving the problems of high defoamer preparation cost and inconvenient use of preparation equipment in the prior art. The purpose of reducing production cost and improving production efficiency can be achieved by improving the ratio of defoamer raw materials and improving the preparation equipment.

[0048] Comparative Example 1: Defoaming performance test was performed using common defoamer NXZ and defoamer XPJ-205 produced in Example 1. 150 g of alumina decomposition liquid was added to two 500 ml measuring cylinders respectively, and then 0.02 g of common defoamer NXZ and 0.02 g of defoamer XPJ-205 were added respectively. Air was blown in at a rate of 2.0 L / MIN. The table below shows the data after 10 seconds of adding the defoamer:

[0049]

[0050] This experiment proves that XPJ-205 has excellent rapid defoaming performance.

[0051] Comparative Example 2: The antifoaming performance test was carried out using the common defoamer NXZ and the defoamer XPJ-205 produced in Example 1. 150 g of alumina decomposition liquid was added to two 500 ml measuring cylinders respectively, and then 0.02 g of the common defoamer NXZ and 0.02 g of the defoamer XPJ-205 were added respectively. The air volume was continuously blown in at 2.0 L / MIN. The table below shows the data 2 hours after the defoamer was added:

[0052]

[0053] This experiment proves that XPJ-205 also has excellent performance in inhibiting defoaming.

[0054] Embodiment 2

[0055] See also Figures 1 to 13 On the basis of the first embodiment, in order to improve the mixing and stirring effect of the raw materials, the present embodiment further proposes a defoaming agent preparation device for electrolytic alumina, comprising a defoaming agent preparation device housing 1, a sealing cover 11 is arranged at the upper end of the defoaming agent preparation device housing 1, an emulsification inner tank assembly 2 is arranged inside the defoaming agent preparation device housing 1, an emulsification stirring assembly 3 is arranged inside the emulsification inner tank assembly 2, a filtering assembly 4 is arranged at the bottom of the emulsification inner tank assembly 2, the emulsification inner tank assembly 2 comprises an emulsification inner tank 21 fixedly mounted on the inner surface of the defoaming agent preparation device housing 1, and an emulsification stirring assembly 3 is arranged inside the emulsification inner tank assembly 2. The component 3 includes a driving motor 31 fixedly mounted on the top of the sealing cover 11, a stirring rod 32 is fixedly mounted on the output shaft of the driving motor 31, a filtering component 4 includes a closing ring 41 and a filtering cover 42, a defoaming agent discharge pipe 211 is arranged at the bottom of the emulsified inner tank 21, a residue discharge pipe 212 is fixedly mounted below the side wall of the emulsified inner tank 21, a control valve is arranged inside the defoaming agent discharge pipe 211 and the residue discharge pipe 212, a constant temperature heating chamber 22 is arranged between the outer side of the emulsified inner tank 21 and the inner side of the defoaming agent preparation equipment housing 1, and the emulsified inner tank 21 and the defoaming agent discharge pipe 211 are connected to the inner side of the housing 1 of the defoaming agent preparation equipment. A sealing ring 23 is sleeved on the inner side of the welding part of the side wall of the shell 1 of the defoaming agent preparation equipment, a heating pipe 25 is fixedly installed on the left side wall of the shell 1 of the defoaming agent preparation equipment, a circulating water pipe 24 is fixedly installed on the right side wall of the shell 1 of the defoaming agent preparation equipment, the emulsification inner tank 21 is an hourglass structure, a stirring rod 32 is rotatably installed in the middle of the emulsification inner tank 21, a disc-type stirring impeller 33 is fixedly installed above the outer surface of the stirring rod 32, a material guide spiral blade 37 is fixedly installed at the bottom of the stirring rod 32, and the material guide spiral blade 37 is arranged above the inner part of the defoaming agent discharge pipe 211, and the outer surface of the stirring rod 32 An active magnetic ring 34 is fixedly installed in the middle of the surface, and a driven magnetic ring 36 is arranged outside the active magnetic ring 34. The driven magnetic ring 36 is rotatably installed on the inner surface of the middle part of the emulsifying inner tank 21. A shear stirring blade fixing ring 35 is fixedly installed below the outer surface of the stirring rod 32. A first shear stirring blade 351 is hingedly installed on the outer surface of the shear stirring blade fixing ring 35. A second shear stirring blade 361 is hingedly installed on the inner surface of the driven magnetic ring 36. Six groups of the second shear stirring blades 361 and the first shear stirring blades 351 are evenly and symmetrically distributed.

[0056] In this embodiment, the emulsification inner tank 21 is inside the shell 1 of the defoaming agent preparation equipment, and a raw material injection port and a solvent injection pipe are arranged above the sealing cover 11. The constant temperature heating chamber 22 is a cavity formed between the emulsification inner tank 21 and the shell 1 of the defoaming agent preparation equipment. Water is injected through the circulating water pipe 24. The sealing ring 23 improves the sealing of the constant temperature heating chamber 22. The heating pipe 25 heats the water to form a water-proof insulation for the emulsification inner tank 21, so that the temperature change inside the emulsification inner tank 21 is stable, ensuring the constant temperature of the emulsification process. The driving motor 31 drives the stirring rod 32 to rotate, which can drive the disc stirring impeller 33, the active magnetic ring 34, and the shear stirring blade fixing ring 35 to rotate. The special shape of the emulsification inner tank 21 makes the raw materials first concentrated in the middle position after being added, and then rotated, stirred and dispersed by the disc stirring impeller 33. The special airfoil design of the disc stirring impeller 33 makes a flow field generated in the middle of the emulsification inner tank 21 during stirring, which can effectively stir the material. , improve the mixing uniformity of the materials, the edge is designed to be thin, which can generate strong shear force to fully disperse the materials, and can generate vortex flow when rotating, which is helpful for the materials to pass through the middle of the emulsification inner tank 21 into the mixing space below, and the stirring rod 32 drives the shear stirring blade fixing ring 35 and the active magnetic ring 34 to rotate, and the active magnetic ring 34 and the driven magnetic ring 36 are attracted and driven to rotate according to the principle of magnetic coupling, so that the first shear stirring blade 351 and the second shear stirring blade 361 are dispersed and expanded from the bottom and the top respectively under the action of centrifugal force, and have strong axial and radial mixing effects, so that the raw materials can be fully emulsified and mixed in a short time without stratification, further solving the problems of high cost of defoaming agent preparation and inconvenient use of preparation equipment in the prior art, and can reduce production cost and improve production efficiency by improving the ratio of defoaming agent raw materials and improving preparation equipment.

[0057] Embodiment 3

[0058] See also Figures 1 to 13 On the basis of the second embodiment, in order to prevent the narrowest part in the middle of the emulsification inner tank 21 from being blocked when the raw materials flow, this embodiment further proposes that a shearing blade is provided in the middle of the emulsification inner tank 21. The shearing blade is an obliquely rotating stacked heterogeneous blade. A groove is provided on the heterogeneous blade. The heterogeneous blade is arranged below the disc-type stirring impeller 33. A staggered dividing strip is also provided at the obliquely stacked part. The heterogeneous blades are stacked and fixedly installed on the outer surface of the stirring rod 32.

[0059] In this embodiment, after the raw materials are fully mixed by the disc-type stirring impeller 33, they flow into the bottom of the emulsifying inner tank 21 in a vortex shape. During this process, the inclined design of the shear blades and the irregular bevel lines on the edges can increase the shearing effect during the rotation, so that the raw materials are fully broken up. The grooves and distribution dividing strips opened on the heterogeneous blades increase a certain filtering and intercepting effect on the raw materials, so that the raw materials are fully stirred and dispersed, avoiding blockage in the middle of the emulsifying inner tank 21, further solving the problems of high defoaming agent preparation cost and inconvenient use of preparation equipment in the prior art, and can reduce production costs and improve production efficiency by improving the ratio of defoaming agent raw materials and improving preparation equipment.

[0060] Embodiment 4

[0061] See also Figures 1 to 13 On the basis of the third embodiment, in order to enable the second shearing and stirring blade 361 to scrape and stir the raw materials adhered to the inner wall of the emulsifying inner tank 21 while rotating and stirring, this embodiment further proposes to add a scraping plate on the outer side wall of the second shearing and stirring blade 361;

[0062] In this embodiment, the second shearing and stirring blade 361 disperses and stirs the raw materials due to the centrifugal force and the push of the first shearing and stirring blade 351 when rotating. At this time, the scraper plate contacts the inner wall of the emulsifying inner tank 21, and scrapes and stirs the raw materials adhered to the inner wall of the emulsifying inner tank 21, thereby improving the uniformity of mixing of the raw materials. This further solves the problems of high defoaming agent preparation cost and inconvenient use of preparation equipment in the prior art. The purpose of reducing production cost and improving production efficiency can be achieved by improving the ratio of defoaming agent raw materials and improving the preparation equipment.

[0063] Embodiment 5

[0064] See also Figures 1 to 13On the basis of the fourth embodiment, in order to make the emulsified emulsion more delicate, the present embodiment further proposes that the outer surface of the closed ring 41 is fixedly installed at an angle below the inner surface of the emulsifying inner tank 21, a filter cover 42 is movably installed above the closed ring 41, and a ring groove matching the closed ring 41 is provided on the lower surface of the filter cover 42, a filter screen 421 is fixedly installed in the middle of the filter cover 42, the inner wall of the filter screen 421 is slidably connected to the outer surface of the stirring rod 32, and a threaded sleeve 422 is fixedly installed on the lower surface of the filter screen 421, and the inner surface of the threaded sleeve 422 is connected to the stirring rod 32. The outer surface of the filter cover 42 is rotatably connected by a thread, a limit ring 44 is arranged below the closed ring 41, the limit ring 44 is fixedly mounted on the inner surface of the emulsification inner tank 21, a Z-shaped limit frame 441 is fixedly mounted above the limit ring 44, the outer wall of the threaded sleeve 422 is provided with a limit slide groove adapted to the Z-shaped limit frame 441, a sealing cover ring 43 is arranged on the outer side of the filter cover 42, the outer surface of the sealing cover ring 43 is fixedly connected to the inner surface of the emulsification inner tank 21, the outer wall of the filter cover 42 is a truncated cone, and the inner wall of the sealing cover ring 43 matches the curvature of the outer wall of the filter cover 42;

[0065] In this embodiment, the closing ring 41 cooperates with the filter cover 42 and the sealing cover ring 43 on the inner side of the emulsification inner tank 21 to form a residue discharge groove. When the stirring rod 32 rotates forward, the filter screen 421 rises under the limit cooperation of the Z-type limit frame 441, so that the filter cover 42 is lifted and tightly fits with the sealing cover ring 43. At this time, the residue discharge groove is closed. The outer ring of the filter cover 42 and the sealing cover ring 43 are both made of high-temperature resistant rubber material. The filter screen 421 filters the defoaming agent emulsion to filter out the residue. After the defoaming agent emulsion is discharged, the stirring rod 32 rotates in the opposite direction, and the filter screen 421 descends under the limit cooperation of the Z-type limit frame 441, so that the filter cover 42 moves down and engages with the closing ring 41 away from the sealing cover. Ring 43, at this time, distilled water is poured into the equipment to discharge all the residues through the filter cover 42 and the closed ring 41 to the residue discharge groove outside the closed ring 41. Because the closed ring 41 is tilted, the residue discharge pipe 212 is at the lowest point. The residue can be discharged by opening the residue discharge pipe 212. It is simple and convenient to clean and easy to use. It is worth noting that the limit ring 44 is fixed on the emulsifying inner tank 21 to rotate under the stirring rod 32 to increase stability, which further solves the problems of high cost of defoaming agent preparation and inconvenient use of preparation equipment in the prior art. The purpose of reducing production cost and improving production efficiency can be achieved by improving the ratio of defoaming agent raw materials and improving the preparation equipment.

[0066] Embodiment 6

[0067] See also Figures 1 to 14On the basis of the fifth embodiment, in order to make the bottom of the second shearing and stirring blade 361 contact with the filter screen 421 when the filter cover 42 moves downward, and the surface of the filter screen 421 can be cleaned when rotating, the present embodiment further proposes that a first spring rod 352 is provided between the inner surface of the first shearing and stirring blade 351 and the outer surface of the shearing and stirring blade fixing ring 35, a hinged spring connecting rod 362 is movably installed between the outer surface of the second shearing and stirring blade 361 and the inner surface of the driven magnetic ring 36, and an active card slot adapted to the second shearing and stirring blade 361 is provided on the inner wall of the first shearing and stirring blade 351;

[0068] In this embodiment, after the filter screen 421 moves down, the equipment is ready to be cleaned, and the stirring rod 32 rotates at a low speed. At this time, the first spring rod 352 pulls the first shear stirring blade 351 inward and contracts it, and at the same time, the hinged spring connecting rod 362 also pushes the second shear stirring blade 361 inward and contracts it. At this time, the bottom of the second shear stirring blade 361 is still in contact with the filter screen 421. When flushing the equipment, the filter screen 421 can be cleaned at the same time, thereby improving the cleaning effect of the equipment, further solving the problems of high cost of defoaming agent preparation and inconvenient use of preparation equipment in the prior art, and achieving the purpose of reducing production cost and improving production efficiency by improving the ratio of defoaming agent raw materials and improving the preparation equipment.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A defoaming agent preparation device for electrolytic alumina, comprising a defoaming agent preparation device housing (1), wherein a sealing cover (11) is provided at the upper end of the defoaming agent preparation device housing (1), characterized in that: An emulsifying inner tank assembly (2) is disposed inside the defoaming agent preparation device housing (1), an emulsifying stirring assembly (3) is disposed inside the emulsifying inner tank assembly (2), a filtering assembly (4) is disposed at the bottom of the emulsifying inner tank assembly (2), the emulsifying inner tank assembly (2) comprises an emulsifying inner tank (21) fixedly mounted on the inner surface of the defoaming agent preparation device housing (1), the emulsifying stirring assembly (3) comprises a driving motor (31) fixedly mounted on the top of the sealing cover (11), and a stirring assembly (3) is fixedly mounted on the output shaft of the driving motor (31). The stirring rod (32) is provided with a filter assembly (4) including a closed ring (41) and a filter cover (42). The emulsification inner tank (21) is an hourglass structure. The stirring rod (32) is rotatably mounted in the middle of the emulsification inner tank (21). A disc-type stirring impeller (33) is fixedly mounted above the outer surface of the stirring rod (32). A material guiding spiral blade (37) is fixedly mounted at the bottom of the stirring rod (32). The material guiding spiral blade (37) is arranged above the inside of the defoaming agent discharge pipe (211). The middle of the outer surface of the stirring rod (32) is fixedly mounted. An active magnetic ring (34) is installed, and a driven magnetic ring (36) is arranged on the outer side of the active magnetic ring (34). The driven magnetic ring (36) is rotatably installed on the inner surface of the middle part of the emulsification inner tank (21). A shear stirring blade fixing ring (35) is fixedly installed below the outer surface of the stirring rod (32). A first shear stirring blade (351) is hingedly installed on the outer surface of the shear stirring blade fixing ring (35). A second shear stirring blade (361) is hingedly installed on the inner surface of the driven magnetic ring (36). The second shear stirring blade Six groups of blades (361) and first shearing and stirring blades (351) are evenly and symmetrically distributed, a first spring rod (352) is arranged between the inner surface of the first shearing and stirring blade (351) and the outer surface of the shearing and stirring blade fixing ring (35), a hinged spring connecting rod (362) is movably installed between the outer surface of the second shearing and stirring blade (361) and the inner surface of the driven magnetic ring (36), and an active slot adapted to the second shearing and stirring blade (361) is arranged on the inner wall of the first shearing and stirring blade (351).

2. The defoaming agent preparation equipment for electrolytic alumina according to claim 1, characterized in that: A defoamer discharge pipe (211) is provided at the bottom of the emulsification inner tank (21), a residue discharge pipe (212) is fixedly installed below the side wall of the emulsification inner tank (21), and control valves are provided inside the defoamer discharge pipe (211) and the residue discharge pipe (212). A constant temperature heating chamber (22) is provided between the outside of the emulsification inner tank (21) and the inside of the defoamer preparation device housing (1), a sealing ring (23) is sleeved on the inside of the welding point between the emulsification inner tank (21) and the side wall of the defoamer preparation device housing (1), a heating pipe (25) is fixedly installed on the left side wall of the defoamer preparation device housing (1), and a circulating water pipe (24) is fixedly installed on the right side wall of the defoamer preparation device housing (1).

3. The defoaming agent preparation equipment for electrolytic alumina according to claim 1, characterized in that: The outer surface of the closed ring (41) is fixedly installed at an angle below the inner surface of the emulsification inner tank (21), a filter cover (42) is movably installed above the closed ring (41), and the lower surface of the filter cover (42) is provided with an annular groove that matches the closed ring (41).

4. The defoaming agent preparation equipment for electrolytic alumina according to claim 3, characterized in that: A filter screen (421) is fixedly mounted in the middle of the filter cover (42), the inner wall of the filter screen (421) is slidably connected to the outer surface of the stirring rod (32), a threaded sleeve (422) is fixedly mounted on the lower surface of the filter screen (421), and the inner surface of the threaded sleeve (422) is rotatably connected to the outer surface of the stirring rod (32) via a thread.

5. The defoaming agent preparation equipment for electrolytic alumina according to claim 4, characterized in that: A limiting ring (44) is provided below the closed ring (41), the limiting ring (44) is fixedly mounted on the inner surface of the emulsifying inner tank (21), a Z-shaped limiting frame (441) is fixedly mounted above the limiting ring (44), and a limiting sliding groove matching the Z-shaped limiting frame (441) is provided on the outer side wall of the threaded sleeve (422).

6. The defoaming agent preparation equipment for electrolytic alumina according to claim 3, characterized in that: A sealing cover ring (43) is provided on the outside of the filter cover (42); the outer surface of the sealing cover ring (43) is fixedly connected to the inner surface of the emulsifying inner tank (21); the outer wall of the filter cover (42) is truncated cone-shaped; the inner wall of the sealing cover ring (43) matches the curvature of the outer wall of the filter cover (42).

7. A process for preparing a defoaming agent for electrolytic alumina, achieved by the equipment for preparing a defoaming agent for electrolytic alumina according to claim 1, characterized in that: The following steps are involved: Step 1, preparing raw materials for preparing electrolytic alumina defoaming agent, wherein the raw materials include, by weight: 4 parts of polyoxyethylene-polyoxypropylene copolymer, 3 parts of polydimethylsiloxane and its derivatives, 1 part of modified mineral oil, and 1 part of surfactant; Step 2, mixing the raw materials of the electrolytic alumina defoamer, and adding an emulsifying agent for mixing, wherein the emulsifying agent is a mixture of a base polymer, an emulsifier, a stabilizer, a dispersant and a functional additive, the base polymer is polysiloxane, the functional additive is mineral oil, and the emulsifying agent includes, by weight: 3 parts of polysiloxane, 1.5 parts of emulsifier, 0.2 parts of stabilizer, 0.5 parts of dispersant, and 0.5 parts of mineral oil; Step 3, using a defoaming agent preparation device for electrolytic alumina to fully stir the raw materials, and use distilled water as a solvent for emulsification to form a stable emulsion, wherein 8 parts of distilled water are required by weight, the stirring temperature is 50° C., the mixing stirring rate is 600 rpm, the emulsification temperature is 30° C., the emulsification stirring rate is 200 rpm, the mixing stirring time is 10 min, and the emulsification stirring time is 30 min to form a stable emulsion; Step 4: After the defoaming agent for electrolytic alumina is prepared, it is filtered and discharged for filling, and the equipment for preparing the defoaming agent for electrolytic alumina is cleaned to remove impurities remaining in the equipment.

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