Particle size controllable drying system of aluminum hydroxide for aluminum fluoride production

Abstract

The utility model discloses a material drying system, and particularly relates to an aluminum hydroxide particle size-controllable drying system for aluminum fluoride production, which is structurally characterized in that a discharge port of an aluminum hydroxide feeder is connected with a feed port of an airflow drying pipe connected with hot air, and a discharge port of the airflow drying pipe is communicated with a feed port of a primary cyclone; a dust outlet in the upper portion of the first-stage cyclone is connected with the second-stage cyclone, a discharge port of the first-stage cyclone is connected with the filter sieve, a discharge port of the filter sieve is connected with the cooler, an air inlet of the cooler is connected with the fluidization fan, a dust outlet in the upper portion of the cooler is connected with the second-stage cyclone, and a discharge port of the cooler is connected with the aluminum hydroxide finished product bin. And a discharge hole of the second-stage cyclone is connected with the fine material bin. According to the utility model, the problems of high loss, low yield, easiness in blockage of the fluidized bed and poor product quality in the aluminum fluoride production process caused by overlarge or oversmall aluminum hydroxide granularity are solved, and the yield and the quality of the product are improved.

Description

Technical Field

[0001] The utility model relates to a material drying system, in particular to a drying system with controllable particle size of aluminum hydroxide used in aluminum fluoride production, which focuses on solving the problem that too coarse or too fine aluminum hydroxide in the dry aluminum fluoride production process will affect the product output and quality as well as the working state of the production equipment. Background Art

[0002] At present, the mainstream aluminum fluoride production process is to use a fluidized bed to allow clean hydrogen fluoride gas to fully mix and react with dry aluminum hydroxide to generate aluminum fluoride. In this process, the particle size of aluminum hydroxide has a significant impact on product output, quality, working status and working conditions of production equipment. It is generally required that large particles with a particle size greater than 0.5mm are not allowed in the dry aluminum hydroxide, and fine particles with a particle size less than 0.045mm are strictly controlled. The existing production system does not fully consider the adverse effects of particle size on production. The dried aluminum hydroxide is directly sent to the fluidized bed for production, resulting in technical problems such as reduced output and poor quality. In severe cases, the fluidized bed distribution plate is blocked, resulting in shutdown. The utility model cleverly solves this technical problem by improving the drying system. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a drying system with controllable particle size of aluminum hydroxide for aluminum fluoride production, which solves the technical problems of high loss and low yield, easy blockage of fluidized bed and poor product quality in the production process of aluminum fluoride caused by excessively large or small aluminum hydroxide particles, thereby improving the output and quality of the product.

[0004] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0005] The drying system of aluminum hydroxide with controllable particle size for aluminum fluoride production has the following structure: the discharge port of the aluminum hydroxide feeder is connected to the inlet of an airflow drying tube connected to hot air, the discharge port of the airflow drying tube is connected to the inlet of a primary cyclone, the upper dust outlet of the primary cyclone is connected to the secondary cyclone, the discharge port of the primary cyclone is connected to a filter screen, the discharge port of the filter screen is connected to a cooler, the air inlet of the cooler is connected to a fluidizing fan, the upper dust outlet of the cooler is connected to the secondary cyclone, the discharge port of the cooler is connected to an aluminum hydroxide finished product bin, and the discharge port of the secondary cyclone is connected to a fine material bin.

[0006] Preferably, the upper dust outlet of the above-mentioned secondary cyclone is connected to the power fan, the power fan is connected to the bag dust collector, and the discharge port of the bag dust collector is connected to the fine material bin.

[0007] Preferably, a distribution plate is provided at the bottom of the cooler.

[0008] Due to the adoption of the above technical solution, the utility model has the following characteristics and effects:

[0009] The utility model utilizes the ingenious design of the two-stage cyclone to effectively separate fine particles from large particles. The setting of the filter screen prevents overly large particles from entering the fluidized bed Xi'an and reacting with aluminum fluoride. The cooler with fluidization function can secondary screen out fine particles, thereby strictly controlling the content of fine particles in the finished dry aluminum hydroxide.

[0010] The utility model utilizes two cyclone separations and a filter screen, which solves the technical problems of high loss and low yield, easy blockage of the fluidized bed and poor product quality in the production process of aluminum fluoride caused by excessively large or small aluminum hydroxide particles, thereby improving the output and quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a schematic diagram of the structure of a drying system for controlling the particle size of aluminum hydroxide used in the production of aluminum fluoride.

[0012] In the figure: 1. Aluminum hydroxide feeder; 2. Aluminum hydroxide finished product warehouse; 3. Fluidizing fan; 4. Cooler; 5. Filter screen; 6. Air flow drying tube; 7. First-stage cyclone; 8. Second-stage cyclone; 9. Power fan; 10. Bag dust collector; 11. Fine material warehouse. DETAILED DESCRIPTION

[0013] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0014] like Figure 1 As shown, the utility model has a drying system with controllable particle size of aluminum hydroxide for aluminum fluoride production, and its structure is as follows: the discharge port of the aluminum hydroxide feeder 1 is connected to the feed port of the airflow drying pipe 6 connected to the hot air, the discharge port of the airflow drying pipe 6 is connected to the feed port of the primary cyclone 7, the upper dust outlet of the primary cyclone 7 is connected to the secondary cyclone 8, the discharge port of the primary cyclone 7 is connected to the filter screen 5, the discharge port of the filter screen 5 is connected to the cooler 4 with a distribution plate at the bottom, the air inlet of the cooler 4 is connected to the fluidizing fan 3, the upper dust outlet of the cooler 4 is connected to the secondary cyclone 8, the discharge port of the cooler 4 is connected to the aluminum hydroxide finished product bin 2, the upper dust outlet of the secondary cyclone 8 is connected to the power fan 9, the power fan 9 is connected to the bag dust collector 10, the discharge port of the bag dust collector 10 is connected to the fine material bin 11, and the discharge port of the secondary cyclone 8 is connected to the fine material bin 11.

[0015] The working principle of the utility model is as follows:

[0016] The wet aluminum hydroxide enters the airflow drying tube 6 together with the pre-mixed hot air with pressure through the aluminum hydroxide feeder 1. The aluminum hydroxide is fully dried in the airflow drying tube 6. The dried aluminum hydroxide forms a gas-solid mixture with the hot air and goes up along the airflow drying tube 6 to finally enter the primary cyclone 7. The primary cyclone 7 can capture aluminum hydroxide particles with large particle size, and lift the fine particles into the secondary cyclone 8. The larger particles of aluminum hydroxide enter the filter screen 5 to screen out the oversized particles with a particle size greater than 5mm. The screened aluminum hydroxide enters the cooler 4 for cooling. The bottom of the cooler 4 is provided with a distribution plate connected to the fluidizing fan 3. The dried aluminum hydroxide is fluidized in the cooler 4. On the one hand, it can be cooled more efficiently and evenly. On the other hand, during the fluidization process, the fine particles will float on the surface of the fluidized body and leave the cooler 4 through the pipeline connected to the secondary cyclone on the cooler 4, thereby strictly controlling the fine particles from entering the final product. The screened and cooled aluminum hydroxide enters the aluminum hydroxide finished product warehouse 2 by overflow, ready to participate in the next process reaction. Part of the fine particles entering the secondary cyclone 8 directly fall into the fine material bin 11, and part enters the bag filter and is finally collected in the fine material bin for other uses.

[0017] The utility model utilizes the ingenious design of the two-stage cyclone to effectively separate fine particles from large particles. The setting of the filter screen prevents excessively large particles from entering the fluidized bed to participate in the aluminum fluoride reaction. The cooler with fluidization function can secondary screen out fine particles, thereby strictly controlling the content of fine particles in the finished dry aluminum hydroxide.

Claims

1. A drying system for aluminum hydroxide with controllable particle size for aluminum fluoride production, characterized by The structure is as follows: the discharge port of the aluminum hydroxide feeder (1) is connected to the feed port of the airflow drying tube (6) connected to the hot air, the discharge port of the airflow drying tube (6) is connected to the feed port of the primary cyclone (7), the upper dust outlet of the primary cyclone (7) is connected to the secondary cyclone (8), the discharge port of the primary cyclone (7) is connected to the filter screen (5), the discharge port of the filter screen (5) is connected to the cooler (4), the air inlet of the cooler (4) is connected to the fluidizing fan (3), the upper dust outlet of the cooler (4) is connected to the secondary cyclone (8), the discharge port of the cooler (4) is connected to the aluminum hydroxide finished product bin (2), and the discharge port of the secondary cyclone (8) is connected to the fine material bin (11).

2. The drying system for controlling the particle size of aluminum hydroxide for aluminum fluoride production according to claim 1, characterized in that The upper dust outlet of the secondary cyclone (8) is connected to a power fan (9), the power fan (9) is connected to a bag dust collector (10), and the material outlet of the bag dust collector (10) is connected to a fine material bin (11).

3. The drying system for controlling the particle size of aluminum hydroxide for aluminum fluoride production according to claim 1, characterized in that A distribution plate is provided at the bottom of the cooler (4).

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