Production process of high-purity aluminum fluoride

Abstract

This invention discloses a production process for high-purity aluminum fluoride, relating to the field of aluminum fluoride production technology. The process includes the following steps: S1, generation of hydrogen fluoride gas: fluorite is washed with sulfuric acid in a purification tower and then condensed; S2, anhydrousification of hydrogen fluoride gas: the condensed, water-containing hydrogen fluoride gas is evaporated using a superheater, and then the hydrogen fluoride gas is passed into a sulfidation bed; S3, generation of aluminum fluoride: aluminum hydroxide is passed into the sulfidation bed to generate aluminum fluoride; S4, purification of aluminum fluoride: the generated aluminum fluoride is transported to a purification device to separate aluminum fluoride and alumina to obtain pure aluminum fluoride. This invention allows aluminum fluoride to repeatedly tumble and slide in layers within the device, separating aluminum fluoride and alumina, thus improving purity while achieving high efficiency in heat dissipation and dust removal at a low cost.

Description

Technical Field

[0001] This invention relates to the field of aluminum fluoride production technology, specifically the production process of high-purity aluminum fluoride. Background Technology

[0002] Aluminum fluoride is an inorganic compound with the chemical formula AlF3, appearing as colorless or white crystals. It is insoluble in water, acids, and alkalis. Aluminum fluoride is primarily used as a modifier and flux in the aluminum electrolysis process. It can also be used as a catalyst in the synthesis of organic and organofluorine compounds, as a flux and component in ceramics and enamels, as an improver of the refractive index of lenses and prisms, in the manufacture of fluorinated glass with low infrared spectral loss, and as an inhibitor in alcohol production. Achieving comprehensive utilization of fluorine resources is crucial for the healthy and sustainable development of China's aluminum fluoride industry.

[0003] For example, Chinese patent publication number CN 105371639 B discloses a rapid drying device and process for aluminum fluoride. The device includes: a first cyclone dryer, a second cyclone dryer, and a third cyclone dryer; a carrier gas generating device and an air duct connected to the carrier gas generating device, wherein the carrier gas moves from upstream to downstream in the air duct and passes sequentially through the carrier gas inlet and outlet of the third cyclone dryer, the carrier gas inlet and outlet of the second cyclone dryer, and the carrier gas inlet and outlet of the first cyclone dryer; and a feeding device for supplying material to the air duct, the feeding device being connected to the air duct through a discharge port.

[0004] The rapid drying apparatus for aluminum fluoride provided by this invention utilizes a three-stage cyclone dryer to sequentially remove free water and water of crystallization. However, this apparatus does not perform dust removal and cooling on the high-temperature aluminum fluoride after the reaction during the drying and dehydration process, resulting in a still high exhaust gas temperature. Furthermore, the exhaust gas temperature becomes uneven due to airflow turbulence after passing through the cyclone dryer, and dust in the exhaust gas is not effectively trapped, thus affecting the quality of the produced aluminum fluoride. Additionally, existing technologies cannot separate the alumina produced under high temperatures, resulting in a mixture of aluminum fluoride and alumina, which reduces the purity of the finished product. Therefore, this invention proposes a high-purity aluminum fluoride production process to solve the aforementioned problems. Summary of the Invention

[0005] The present invention aims to provide a production process for high-purity aluminum fluoride to separate aluminum fluoride and aluminum oxide, thereby solving the problem of product purity.

[0006] To achieve the above objectives, the basic solution of the present invention is as follows: a production process for high-purity aluminum fluoride, comprising the following steps.

[0007] S1, the generation of hydrogen fluoride gas, is achieved by placing fluorite in a purification tower, washing it with sulfuric acid, and then condensing it.

[0008] S2, anhydrous hydrogen fluoride gas is produced by evaporating the condensed water-containing hydrogen fluoride gas using a superheater, and then the hydrogen fluoride gas is introduced into the sulfidation bed.

[0009] S3, the formation of aluminum fluoride, is achieved by introducing aluminum hydroxide into the sulfurized bed to generate aluminum fluoride;

[0010] S4, Purification of aluminum fluoride: The generated aluminum fluoride is transported to a purification device to separate aluminum fluoride and aluminum oxide to obtain pure aluminum fluoride.

[0011] Furthermore, the device includes a body with a first feed inlet and a second feed inlet at the top. A first air inlet and a second air inlet are respectively connected to the two side walls of the upper part of the device. A first blower and a second blower are respectively installed inside the first air inlet and the second air inlet. Inside the device, from top to bottom, a first conical drain tank, a conical diverter tank, a second conical drain tank, and a collection tank are installed sequentially. A partition is fixedly connected to the lower part of both the first and second conical drain tanks, and an opening is provided in the middle of each partition. A ring-shaped... The plate has several through holes. The first and second conical leaking barrels are located inside the partition and are equipped with annularly wound heat dissipation copper pipes. The conical diversion barrel is also equipped with annularly wound heat dissipation copper pipes. A cooler is installed on the outer wall of the device. All the heat dissipation copper pipes are connected to the cooler and contain coolant. An air outlet is opened on the lower side wall of the device and is connected to the exhaust gas treatment box. The collection barrel contains a prepared salt solution with a density of 3.3-3.4 g / ml.

[0012] The basic principle of the device: Aluminum fluoride requiring dust removal and cooling is added to the device through the first and second inlets at the top. The first and second blowers are activated, and the airflow generated by the blowers enters the device through the first and second inlets. The airflow carries the aluminum fluoride down the side wall of the first conical filter. The aluminum fluoride falls through an opening in the middle of the partition to the top of the conical diversion tank. The conical diversion tank diverts the aluminum fluoride, causing it to slide onto the annular plate circumferentially within the tank. Aluminum fluoride falls through several through-holes in the annular plate onto the second conical funnel. Aluminum fluoride then collects again through the sidewall of the second conical funnel and falls into the collection tank. During the stratified sliding of the aluminum fluoride, the coolant inside the annularly wound heat-dissipating copper pipe absorbs the heat from the aluminum fluoride. The heated coolant then enters the radiator, is cooled, and re-enters the device through the heat-dissipating copper pipe to absorb heat. Finally, the aluminum fluoride falls into the collection tank, where it is cooled by a salt solution containing aluminum oxide with a density of 3.5 g / cm³. 3 The density of aluminum fluoride is 2.88–3.18 g / cm³. 3Since the density of the salt solution is 3.3-3.4 g / ml, aluminum fluoride will float on the surface of the salt solution, while the aluminum oxide mixed in the aluminum fluoride will sink to the bottom of the collection tank, which can quickly separate the aluminum oxide from the aluminum fluoride; the airflow in the device enters the exhaust gas treatment box through the air outlet, and the exhaust gas treatment box treats the dust, impurities and residual hydrogen fluoride in the airflow.

[0013] The beneficial effects achieved are as follows: The high-purity aluminum fluoride production process provided by this invention utilizes a first conical funnel, a conical diversion tank, a second conical funnel, and a collection tank installed sequentially from top to bottom inside the device. This allows the aluminum fluoride to repeatedly tumble and slide down in layers within the device along with the airflow generated by the blower. During this process, the airflow accelerates the downward movement of the aluminum fluoride while simultaneously accelerating its cooling. Furthermore, impurities and dust in the aluminum fluoride are separated during the tumbling and stratification process, allowing them to be treated in the exhaust gas treatment box along with the airflow. This device uses airflow cooling while incorporating heat dissipation copper pipes for auxiliary heat dissipation, ensuring sufficient heat dissipation during the stratified tumbling and sliding process. This method offers high heat dissipation efficiency and low cost, increasing operational efficiency while reducing the difficulty of operation for workers. The airflow generated during the drying, dehydration, dust removal, and cooling processes of this device remains turbulent, resulting in uniform exhaust gas temperature. Simultaneously, dust in the exhaust gas is effectively trapped, thereby improving the quality of the produced aluminum fluoride.

[0014] Furthermore, the first air inlet and the second air inlet are tangent to the device body, and the first feed inlet is located above the first air inlet, and the second feed inlet is located above the second air inlet.

[0015] The principle and beneficial effects of the basic scheme are as follows: By designing the device body to be tangent to the first and second air inlets, the airflow entering the device body can generate centrifugal rotation. At the same time, aluminum fluoride is added into the device body through the feed port above the air inlets, causing the aluminum fluoride to move downward with the rotating airflow, which increases the cooling effect and dust removal effect of the aluminum fluoride. Furthermore, the aluminum fluoride inside the device body can move downward faster with the airflow, increasing the operating efficiency of the device.

[0016] Furthermore, a door panel is hinged to the side wall of the collection bucket, and a handle is fixedly connected to the door panel.

[0017] The principle and benefits of the basic solution are as follows: the door panel and handle on the side wall of the collection bucket can be easily opened, allowing workers to take out the collected aluminum fluoride through the opened door panel, thus increasing work efficiency.

[0018] Furthermore, several annular stripes are machined on the side walls of the first conical leaking barrel, the second conical leaking barrel, and the conical diversion barrel.

[0019] The principle and beneficial effects of the basic scheme are as follows: through the processing of annular stripes, aluminum fluoride can be layered and mixed by the annular stripes when passing through the side walls of the first conical filter, the second conical filter, and the conical diversion tank, thereby achieving the purpose of removing impurities.

[0020] Furthermore, several friction protrusions are machined on the side walls of the first conical leaking barrel, the second conical leaking barrel, and the conical diversion barrel.

[0021] The principle and beneficial effects of the basic scheme are as follows: by processing several friction bumps, aluminum fluoride can be tumbled back and forth as it falls through the first conical funnel, the second conical funnel, and the conical diversion tank inside the device. The aluminum fluoride particles collide with each other with the friction bumps, so that the collected aluminum fluoride product has a uniform volume and mass.

[0022] Furthermore, a motor is installed on the side wall of the lower part of the device, and a fan blade is coaxially connected to the output shaft of the motor.

[0023] The principle and beneficial effects of the basic scheme are as follows: the rotation of the motor output shaft drives the fan blades to rotate, and the airflow generated by the rotation of the fan blades guides the airflow inside the device to the air outlet, thereby increasing the processing efficiency of the airflow entering the exhaust gas treatment box.

[0024] Furthermore, a vertical filter plate is detachably connected to the air outlet.

[0025] The principle and beneficial effects of the basic solution are as follows: the vertical filter plate that can be detachably connected at the air outlet can filter the gas entering the exhaust gas treatment box, preventing the airflow from carrying aluminum fluoride into the exhaust gas treatment box and reducing resource waste.

[0026] Furthermore, one-way doors are installed in both the first and second feed inlets.

[0027] The principle and beneficial effects of the basic scheme are as follows: by installing a one-way door, it is possible to control that only aluminum fluoride can enter through the first and second inlets, so that it will not be carried out of the device by the airflow.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the internal structure of an embodiment of the present invention.

[0030] Figure 2 This is a front view of the first conical sieve according to an embodiment of this application.

[0031] Figure 3 This is a front view of the conical diversion bucket according to an embodiment of this application.

[0032] Figure 4 This is a top view of an embodiment of this application. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0035] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0036] The reference numerals in the accompanying drawings include: device body 1, first feed inlet 2, second feed inlet 3, first air inlet 4, second air inlet 5, first conical drain 6, partition 7, through port 8, conical diverter 9, annular plate 10, through hole 11, second conical drain 12, one-way door 13, collection bucket 14, handle 15, exhaust gas treatment box 16, first blower 17, second blower 18, door panel 19, cooler 20, fan blade 21, motor 22, annular stripe 23, filter plate 24, friction protrusion 25, heat dissipation copper pipe 26.

[0037] The following detailed description provides further details on specific implementation methods.

[0038] Example 1

[0039] The production process of high-purity aluminum fluoride includes the following steps:

[0040] S1, the generation of hydrogen fluoride gas, is achieved by placing fluorite in a purification tower, washing it with sulfuric acid, and then condensing it.

[0041] S2, anhydrous hydrogen fluoride gas is produced by evaporating the condensed water-containing hydrogen fluoride gas using a superheater, and then the hydrogen fluoride gas is introduced into the sulfidation bed.

[0042] S3, the formation of aluminum fluoride, is achieved by introducing aluminum hydroxide into the sulfurized bed to generate aluminum fluoride;

[0043] S4, Purification of aluminum fluoride: The generated aluminum fluoride is transported to a purification device to separate aluminum fluoride and aluminum oxide to obtain pure aluminum fluoride.

[0044] Example 2:

[0045] The difference between this embodiment and the above embodiments is that the embodiment is basically as shown in the appendix. Figure 1 Appendix Figure 2 Appendix Figure 3 and attached Figure 4 The process for producing high-purity aluminum fluoride includes a device body 1. The top of the device body 1 has a first feed inlet 2 and a second feed inlet 3. The upper side walls of the device body 1 are respectively connected to a first air inlet 4 and a second air inlet 5. A first blower 17 and a second blower 18 are installed inside the first air inlet 4 and the second air inlet 5, respectively. Inside the device body 1, from top to bottom, are a first conical drain 6, a conical diversion tank 9, a second conical drain 12, and a collection tank 14. The lower parts of both the first conical drain 6 and the second conical drain 12 are fixedly connected to a partition 7, and each partition 7 has an opening 8 in the middle. The outer side of the conical diversion tank 9 is fixed... A ring plate 10 is connected, and several through holes 11 are opened on the ring plate 10. The first conical leakage tank 6 and the second conical leakage tank 12 are respectively located inside the partition plate 7 and are equipped with annularly wound heat dissipation copper pipes 26. The conical diversion tank 9 is also equipped with annularly wound heat dissipation copper pipes 26. A cooler 20 is installed on the outer wall of the device body 1. All heat dissipation copper pipes 26 are connected to the heat dissipation copper pipes 26 and are filled with coolant. An air outlet is opened on the lower side wall of the device body 1 and is connected to the exhaust gas treatment box 16. A prepared salt solution is placed in the collection tank 14. The density of the salt solution is 3.3 to 3.4 g / ml.

[0046] The specific implementation process is as follows: The device introduces aluminum fluoride requiring dust removal and cooling into the device through the first inlet 2 and the second inlet 3 at the top of the device body 1. The first blower 17 and the second blower 18 are started. The airflow generated by the blowers enters the device through the first air inlet 4 and the second air inlet 5. The airflow carries the aluminum fluoride down the side wall of the first conical drain 6. The aluminum fluoride falls through the opening 8 in the middle of the partition 7 to the top of the conical diversion tank 9. The conical diversion tank 9 diverts the aluminum fluoride, causing it to slide onto the annular plate 10 around the circumference of the conical diversion tank 9. Aluminum falls through several through holes 11 on the annular plate 10 onto the second conical funnel 12. Aluminum fluoride then collects through the sidewall of the second conical funnel 12 and falls into the collection tank 14. During the stratified sliding of the aluminum fluoride, the coolant inside the annularly wound heat dissipation copper pipe 26 absorbs the heat from the aluminum fluoride into the heat dissipation copper pipe 26. The heated coolant enters the radiator, is cooled, and then flows back into the device through the heat dissipation copper pipe 26 to absorb heat. Finally, the aluminum fluoride falls into the collection tank 14, where a salt solution with an aluminum oxide density of 3.5 g / cm³ is placed. 3 The density of aluminum fluoride is 2.88–3.18 g / cm³. 3 Since the density of the salt solution is 3.3-3.4 g / ml, aluminum fluoride will float on the surface of the salt solution, while the aluminum oxide mixed in the aluminum fluoride will sink to the bottom of the collection tank 14, which can quickly separate the aluminum oxide from the aluminum fluoride; the airflow in the device enters the exhaust gas treatment box 16 through the air outlet, and the exhaust gas treatment box 16 treats the dust, impurities and residual hydrogen fluoride in the airflow.

[0047] Example 3:

[0048] The difference from the above embodiments is that, as shown in the appendix Figure 4 As shown: the first air inlet 4 and the second air inlet 5 are tangent to the device body 1, and the first feed inlet 2 is located above the first air inlet 4, and the second feed inlet 3 is located above the second air inlet 5.

[0049] The specific implementation process is as follows: By designing the device body 1 to be tangent to the first air inlet 4 and the second air inlet 5, the airflow entering the device body 1 can generate centrifugal rotation. At the same time, aluminum fluoride is added into the device body 1 through the feed port above the air inlet, so that the aluminum fluoride moves downward with the rotating airflow, which increases the cooling effect and dust removal effect of the aluminum fluoride. It also allows the aluminum fluoride inside the device body 1 to move downward faster with the airflow, which increases the operating efficiency of the device.

[0050] Example 4

[0051] The difference from the above embodiments is that, as shown in the appendix Figure 1As shown: A door panel 19 is hinged to the side wall of the device body 1 of the collection bucket 14, and a handle 15 is fixedly connected to the door panel 19.

[0052] The specific implementation process is as follows: The door panel 19 and the handle 15 are hinged on the side wall of the device body 1 of the collection bucket 14, which can be easily opened, allowing the staff to take out the collected aluminum fluoride through the opened door panel 19, thereby increasing work efficiency.

[0053] Example 5:

[0054] The difference from the above embodiments is that, as shown in the appendix Figure 2 As shown: Several annular stripes 23 are machined on the side walls of the first conical leaking barrel 6, the second conical leaking barrel 12, and the conical diversion barrel 9.

[0055] The specific implementation process is as follows: Through the processed annular stripes 23, aluminum fluoride can be layered and mixed by the annular stripes 23 when passing through the side walls of the first conical filter 6, the second conical filter 12 and the conical diversion tank 9, thereby achieving the purpose of removing impurities.

[0056] Example 6:

[0057] The difference from the above embodiments is that, as shown in the appendix Figure 3 As shown: Several friction protrusions 25 are machined on the side walls of the first conical leaking barrel 6, the second conical leaking barrel 12, and the conical diversion barrel 9.

[0058] The specific implementation process is as follows: Through the processing of several friction protrusions 25, aluminum fluoride can be tumbled back and forth as it falls through the first conical funnel 6, the second conical funnel 12 and the conical diversion tank 9 inside the device body 1. The aluminum fluoride particles collide with each other with the friction protrusions 25, so that the collected aluminum fluoride finished product has a uniform volume and mass.

[0059] Example 7:

[0060] The difference from the above embodiments is that, as shown in the appendix Figure 1 As shown: A motor 22 is installed on the side wall of the lower part of the device body 1, and a fan blade 21 is coaxially connected to the output shaft of the motor 22.

[0061] The specific implementation process is as follows: the output shaft of motor 22 drives the fan blade 21 to rotate, and the airflow generated by the rotation of fan blade 21 guides the airflow inside the device body 1 to the air outlet, thereby increasing the processing efficiency of the airflow entering the exhaust gas treatment box 16.

[0062] Example 8:

[0063] The difference from the above embodiments is that, as shown in the appendix Figure 1 As shown: A vertical filter plate 24 is detachably connected to the air outlet.

[0064] The specific implementation process is as follows: The gas entering the exhaust gas treatment box 16 can be filtered by the vertical filter plate 24 that can be detachably connected at the air outlet, preventing the airflow from carrying aluminum fluoride into the exhaust gas treatment box 16 and reducing the waste of resources.

[0065] Example 9:

[0066] The difference from the above embodiments is that, as shown in the appendix Figure 1 As shown: One-way doors 13 are installed in both the first feed inlet 2 and the second feed inlet 3.

[0067] The specific implementation process is as follows: By installing the one-way door 13, it is possible to control that only aluminum fluoride can enter through the first feed port 2 and the second feed port 3, so that it will not be carried out of the device body 1 by the airflow.

[0068] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific structures and / or characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A production process for high-purity aluminum fluoride, characterized in that: Includes the following steps S1, the generation of hydrogen fluoride gas, is achieved by placing fluorite in a purification tower, washing it with sulfuric acid, and then condensing it. S2, anhydrous hydrogen fluoride gas is produced by evaporating the condensed water-containing hydrogen fluoride gas using a superheater, and then the hydrogen fluoride gas is introduced into a fluidized bed. S3, the formation of aluminum fluoride, is achieved by introducing aluminum hydroxide into a fluidized bed to generate aluminum fluoride; S4, Purification of aluminum fluoride: The generated aluminum fluoride is transported to a purification device to separate aluminum fluoride and aluminum oxide to obtain pure aluminum fluoride. The purification device includes a device body with a first feed inlet and a second feed inlet at the top. A first air inlet and a second air inlet are respectively connected to the two side walls of the upper part of the device body. A first blower and a second blower are respectively installed inside the first air inlet and the second air inlet. Inside the device body, from top to bottom, a first conical filter, a conical diverter, a second conical filter, and a collection tank are installed sequentially. A partition is fixedly connected to the lower part of both the first and second conical filter, and an opening is provided in the middle of each partition. The outer side of the conical diverter... A ring plate is fixedly connected, and several through holes are opened on the ring plate. The first and second conical leaking barrels are respectively located inside the partition plate and are equipped with annularly wound heat dissipation copper pipes. The conical diversion barrel is also equipped with annularly wound heat dissipation copper pipes. A cooler is installed on the outer wall of the device body. All heat dissipation copper pipes are connected to the radiator and contain coolant. An air outlet is opened on the lower side wall of the device body and is connected to the exhaust gas treatment box. The collection barrel contains a prepared salt solution with a density of 3.3-3.4 g / ml. The first and second air inlets are tangent to the device body, and the first feed inlet is located above the first air inlet, and the second feed inlet is located above the second air inlet.

2. The production process of high-purity aluminum fluoride according to claim 1, characterized in that: The collection bin has a door panel hinged to its side wall, and a handle is fixedly connected to the door panel.

3. The production process of high-purity aluminum fluoride according to claim 2, characterized in that: The side walls of the first conical funnel, the second conical funnel, and the conical diversion tank are all machined with several annular stripes.

4. The production process of high-purity aluminum fluoride according to claim 2, characterized in that: Several friction protrusions are machined on the side walls of the first conical sluice, the second conical sluice, and the conical diverter.

5. The production process of high-purity aluminum fluoride according to claim 2, characterized in that: A motor is installed on the side wall at the bottom of the device, and the motor output shaft is coaxially connected to a fan blade.

6. The production process of high-purity aluminum fluoride according to claim 2, characterized in that: A vertical filter plate is detachably connected to the air outlet.

7. The production process of high-purity aluminum fluoride according to claim 2, characterized in that: One-way doors are installed in both the first and second feed inlets.

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