An apparatus for the production of a cryolite suspension

Abstract

A kind of production device of cryolite suspension, including horizontal reaction tank body, aluminium hydroxide powder bin, sodium hydroxide powder bin and stirring mixing mechanism;Horizontal reaction tank body includes vertical plate located in two side walls, circular arc plate located in bottom, cover plate located in top and end head located in two ends, stirring mixing mechanism includes mixing motor a and mixing motor b respectively arranged on the end head of two ends, the rotating shaft of mixing motor a and mixing motor b is respectively connected with horizontal 316L stainless steel spiral shaft a and horizontal 316L stainless steel spiral shaft b arranged in horizontal reaction tank body, the bottom center of circular arc plate is equipped with cryolite suspension discharge port with discharge valve, the middle part of cover plate is equipped with ammonium fluoride solution liquid inlet interface and exhaust port.The advantages of the utility model are: the axial mixing of horizontal reaction tank body can reduce the settlement of aluminium hydroxide and sodium hydroxide, accelerate dissolution and reaction, and the concentration uniformity of reaction solution is significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of cryolite production technology, specifically to a cryolite suspension production device. Background Technology

[0002] Cryolite is an alkali metal fluoroaluminate, also known as sodium fluoroaluminate, with the molecular formula Na3AlF6. As a chemical product, cryolite is mainly used as a flux in the smelting of metallic aluminum. It can also be used as an insecticide for crops, an enamel opacifier, and an opacifier and flux in glass and enamel production. In the reaction of ammonium fluoride solution with aluminum hydroxide and sodium hydroxide, the stirring flow field in a vertical reactor is mainly radial and axial. When the height-to-diameter ratio is large, a concentration gradient of "thin at the top and thick at the bottom" easily occurs, affecting the reaction and increasing the reaction time. Maintenance is also inconvenient due to the considerable height. Utility Model Content

[0003] The purpose of this invention is to provide a production device for cryolite suspension to address the aforementioned deficiencies.

[0004] A cryolite suspension production apparatus includes a horizontal reaction tank, an aluminum hydroxide powder silo, a sodium hydroxide powder silo, and a stirring and mixing mechanism.

[0005] The horizontal reaction tank includes vertical plates on both side walls, an arc plate at the bottom, a cover plate at the top, and end caps at both ends. The mixing mechanism includes a mixing motor a and a mixing motor b respectively mounted on the end caps at both ends. The shafts of mixing motor a and mixing motor b are respectively connected to horizontal 316L stainless steel spiral shaft a and horizontal 316L stainless steel spiral shaft b mounted in the horizontal reaction tank. A cryolite suspension discharge port with a discharge valve is provided at the bottom center of the arc plate. An ammonium fluoride solution inlet and an exhaust port are provided in the middle of the cover plate.

[0006] The aluminum hydroxide powder silos and sodium hydroxide powder silos are located on both sides above the cover plate at the top of the horizontal reaction tank. The bottom of both the aluminum hydroxide powder silos and sodium hydroxide powder silos is conical with a cone angle ≥70°. Vibration motors are installed on both sides of the bottom of the silos. The conical surface of the bottom of the silos is lined with a 316L stainless steel polished plate. The outlets of the aluminum hydroxide powder silos and sodium hydroxide powder silos are connected to the aluminum hydroxide inlet and sodium hydroxide inlet on the cover plate respectively through pneumatic butterfly valves and sealing flanges.

[0007] Preferably, the horizontal reaction tank is made of 316L stainless steel and lined with polytetrafluoroethylene.

[0008] Preferably, the bottom of the horizontal reaction tank is provided with a support frame.

[0009] Preferably, horizontal 316L stainless steel spiral shaft a and horizontal 316L stainless steel spiral shaft b are located at the same height and rotate in opposite directions, and both surfaces are coated with a polytetrafluoroethylene layer. Horizontal 316L stainless steel spiral shaft a conveys the powder falling from the aluminum hydroxide powder hopper towards the other end, while horizontal 316L stainless steel spiral shaft b conveys the returned material falling from the sodium hydroxide powder hopper towards the aluminum hydroxide powder hopper end, forming a confluence and promoting the reaction.

[0010] Preferably, the exhaust port is connected to an exhaust pipe, the exhaust pipe is made of PP material, the exhaust pipe is equipped with a wire mesh demister, and the end of the exhaust pipe is connected to the air inlet of the dilute sulfuric acid packed tower.

[0011] Preferably, the top of the horizontal reaction tank is also equipped with multiple 360° rotating spray balls for water spraying and cleaning, and the spray balls are made of PTFE.

[0012] Preferably, the side walls and bottom of the horizontal reaction tank are covered with heat transfer oil jackets.

[0013] The advantages of this invention are: the axial mixing of the horizontal reaction tank can reduce the sedimentation of aluminum hydroxide and sodium hydroxide, accelerate dissolution and reaction, and significantly improve the uniformity of the concentration of the reaction solution compared with the vertical reaction device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a side view of the production unit. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model. Furthermore, if terms such as "first" or "second" appear in the description of this utility model, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] As shown in the attached figure, a cryolite suspension production device includes a horizontal reaction tank 31, an aluminum hydroxide powder silo 32, a sodium hydroxide powder silo 33, and a stirring and mixing mechanism.

[0022] The horizontal reaction tank 31 includes vertical plates 34 on both side walls, an arc plate 35 at the bottom, a cover plate 36 at the top, and end caps 37 at both ends. The pair of vertical plates 34 and arc plates 35 are integrally formed. The stirring and mixing mechanism includes a mixing motor a38 and a mixing motor b39 respectively set on the end caps 37 at both ends. The rotating shafts of the mixing motor a38 and the mixing motor b39 are respectively connected to the horizontal 316L stainless steel spiral shaft a40 and the horizontal 316L stainless steel spiral shaft b41 set in the horizontal reaction tank 31. The bottom center of the arc plate 35 is provided with a cryolite suspension discharge port 42 with a discharge valve. The middle part of the cover plate 36 is provided with an ammonium fluoride solution inlet port 50 and an exhaust port 51.

[0023] The aluminum hydroxide powder silo 32 and sodium hydroxide powder silo 33 are located on both sides above the cover plate 36 at the top of the horizontal reaction tank 31. The bottom of both the aluminum hydroxide powder silo 32 and the sodium hydroxide powder silo 33 is conical with a cone angle ≥70°. Vibration motors 44 are installed on both sides of the bottom. The conical surface of the bottom is lined with a 316L stainless steel polished plate. The outlets of the aluminum hydroxide powder silo 32 and the sodium hydroxide powder silo 33 are connected to the aluminum hydroxide feed port and the sodium hydroxide feed port on the cover plate 36 respectively through a pneumatic butterfly valve and a sealing flange.

[0024] In another technical solution, the horizontal reaction tank 31 is made of 316L stainless steel and lined with polytetrafluoroethylene.

[0025] In another technical solution, the bottom of the horizontal reaction tank 31 is provided with a support frame 43.

[0026] In another technical solution, horizontal 316L stainless steel spiral shafts a40 and b41 are located at the same height but rotate in opposite directions, and both are coated with a polytetrafluoroethylene layer. Horizontal 316L stainless steel spiral shaft a40 conveys the powder falling from aluminum hydroxide powder silo 32 towards the other end, while horizontal 316L stainless steel spiral shaft b41 conveys the returned material falling from sodium hydroxide powder silo 33 towards the aluminum hydroxide powder silo 32 end, forming a confluence and promoting the reaction.

[0027] In another technical solution, the exhaust port 51 is connected to an exhaust pipe, which is made of PP material and equipped with a wire mesh demister. The end of the exhaust pipe is connected to the air inlet of the dilute sulfuric acid packed tower.

[0028] In another technical solution, the top of the horizontal reaction tank 31 is also equipped with multiple 360° rotating spray balls for water spraying and cleaning. The spray balls are made of PTFE. The water inlet pipes of the spray balls are connected to an external water source, and the horizontal reaction tank is cleaned by connecting to an external water source when cleaning is required.

[0029] In another technical solution, the horizontal reaction tank 31 is wrapped with heat-conducting oil jackets 52 on both sides and the bottom to maintain the reaction temperature at 80-90℃ and promote the reaction.

[0030] Working principle: Ammonium fluoride solution is transported through pipelines to the ammonium fluoride solution inlet in the middle of the cover plate and enters the horizontal reaction tank. Then, aluminum hydroxide powder and sodium hydroxide powder are added in proportion. Mixing motors a and b are started to drive horizontal 316L stainless steel spiral shafts a and b41 to dissolve and stir the mixed solution. The temperature in the horizontal reaction tank is controlled at 80-90℃ by heating with a heat transfer oil jacket. After the reaction is complete, cryolite suspension is generated and finally discharged from the cryolite suspension discharge port for subsequent processing.

[0031] The above-described embodiments are only intended to illustrate the technical solution and features of this utility model, and are intended to enable those skilled in the art to implement them. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model are within the scope of protection of this utility model. Anything not described in detail is prior art.

Claims

1. A production apparatus for cryolite suspension, characterized in that, It includes a horizontal reaction tank (31), an aluminum hydroxide powder silo (32), a sodium hydroxide powder silo (33), and a stirring and mixing mechanism; The horizontal reaction tank (31) includes vertical plates (34) on both sides, an arc plate (35) at the bottom, a cover plate (36) at the top, and end caps (37) at both ends. The stirring and mixing mechanism includes a mixing motor a (38) and a mixing motor b (39) respectively set on the end caps (37) at both ends. The rotating shafts of the mixing motor a (38) and the mixing motor b (39) are respectively connected to a horizontal 316L stainless steel spiral shaft a (40) and a horizontal 316L stainless steel spiral shaft b (41) set in the horizontal reaction tank (31). The arc plate (35) has a cryolite suspension discharge port (42) with a discharge valve at the bottom center. The cover plate (36) has an ammonium fluoride solution inlet port (50) and an exhaust port (51) in the middle. The aluminum hydroxide powder silo (32) and sodium hydroxide powder silo (33) are located on both sides above the cover plate (36) at the top of the horizontal reaction tank (31). The bottom of the aluminum hydroxide powder silo (32) and sodium hydroxide powder silo (33) are both conical structures with a cone angle ≥70°. Vibration motors (44) are provided on both sides of the bottom of the silo. The conical surface of the bottom of the silo is lined with a 316L stainless steel polished plate. The outlets of the aluminum hydroxide powder silo (32) and sodium hydroxide powder silo (33) are connected to the aluminum hydroxide feed port and sodium hydroxide feed port on the cover plate (36) respectively through a pneumatic butterfly valve and a sealing flange.

2. The apparatus for producing cryolite suspension according to claim 1, characterized in that, The horizontal reaction tank (31) is made of 316L stainless steel and lined with polytetrafluoroethylene.

3. The apparatus for producing cryolite suspension according to claim 1, characterized in that, The bottom of the horizontal reaction tank (31) is provided with a support frame (43).

4. The apparatus for producing cryolite suspension according to claim 1, characterized in that, The horizontal 316L stainless steel spiral shaft a (40) and the horizontal 316L stainless steel spiral shaft b (41) are located at the same height and are arranged in opposite directions of rotation, and both of their surfaces are covered with a polytetrafluoroethylene layer.

5. The apparatus for producing cryolite suspension according to claim 1, characterized in that, The exhaust port (51) is connected to the exhaust pipe, which is made of PP material and equipped with a wire mesh demister. The end of the exhaust pipe is connected to the air inlet of the dilute sulfuric acid packed tower.

6. The apparatus for producing cryolite suspension according to claim 1, characterized in that, The top of the horizontal reaction tank (31) is also equipped with multiple 360° rotating spray balls for water spraying and cleaning. The spray balls are made of PTFE.

7. The apparatus for producing cryolite suspension according to claim 1, characterized in that, The horizontal reaction tank (31) is covered with heat transfer oil jackets (52) on both sides and at the bottom.

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