Crushing and dust falling method for aluminum hydroxide flame retardant production
By using enclosed equipment, temperature-adaptive water mist spraying, and nozzle rinsing, the problem of unsatisfactory dust control during the crushing process in the production of aluminum hydroxide flame retardant was solved, achieving efficient dust reduction and equipment cleaning.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU YICHI NEW MATERIALS CO LTD
- Filing Date
- 2026-01-31
- Publication Date
- 2026-04-17
AI Technical Summary
In the current production of aluminum hydroxide flame retardants, the dust control effect during the crushing process is not ideal.
By enclosing the equipment during the crushing process, using temperature-adaptive water mist spraying, adjusting the water mist diameter and nozzle height, and combining this with rinsing the nozzles with pure water or acidic solution, the spraying method can be adjusted according to the ambient temperature and time intervals to achieve effective dust reduction.
It significantly reduces the generation and dispersion of dust during the crushing process, improves dust control, and reduces the impact of impurities adhering to the nozzles and equipment temperature.
Abstract
Description
Technical Field
[0001] This application relates to the technical field of flame retardants, and in particular to a pulverization and dust reduction method for the production of aluminum hydroxide flame retardants. Background Technology
[0002] In the production of aluminum hydroxide flame retardants, bauxite is required. Existing bauxite needs to be crushed before use. The existing crushing process is prone to generating dust. The usual method used is to control dust by atomizing droplets, but the existing dust control effect is not ideal. Summary of the Invention
[0003] To address the shortcomings of existing technologies, one of the objectives of this application is to provide a pulverization and dust reduction method for the production of aluminum hydroxide flame retardants, which has the advantage of effectively controlling the dust generated during the production process.
[0004] The above-mentioned objective of this application is achieved through the following technical solution: A dust suppression method for pulverizing aluminum hydroxide flame retardant production includes the following steps: pulverizing step: pulverizing bauxite; spraying step: spraying water mist onto the pulverizing step, with a water mist diameter of 1–20 μm; detection step: detecting the ambient temperature and adjusting the diameter of the water mist according to the ambient temperature.
[0005] By adopting the above technical solution, the diameter of the water mist can be adjusted according to the ambient temperature during use, thereby greatly reducing the probability of the dust removal effect weakening due to water mist evaporation in hot weather.
[0006] In a preferred embodiment, this application can be further configured such that, during the detection step, when the ambient temperature is greater than 30 degrees Celsius, the diameter of the water mist is adjusted to 12-20 μm, and the nozzle height is reduced.
[0007] By adopting the above technical solution, that is, when the temperature is greater than 30 degrees Celsius, adjusting the diameter of the water mist (i.e. the diameter of the water mist droplets) and reducing the nozzle height, the amount of water mist evaporation is further reduced.
[0008] In a preferred embodiment, this application may be further configured as follows: in the crushing step, intermittent feeding is adopted, and the crushing equipment is in a closed state during the crushing process; in the spraying step, after the current batch is crushed, the water mist diameter is maintained at 1–20 μm and spraying continues for 30s–60s, followed by the discharge step, in which the crushed bauxite is discharged; and in the rinsing step, the nozzles are rinsed.
[0009] By adopting the above technical solution, namely, the crushing equipment is enclosed during crushing, the probability of dust leakage can be further reduced. After crushing, water mist spraying is maintained, which can greatly reduce the dust content in the crushing equipment. This reduces the probability of dust dispersion when discharging and feeding the crushing device. Washing the nozzles can reduce the probability of impurities adhering to the nozzles.
[0010] In a preferred embodiment, this application can be further configured such that, during the rinsing step, the time interval between the next crushing is obtained; if the time interval is short, the nozzle is rinsed with pure water; if the time interval is long, it is rinsed with an acidic solution.
[0011] By adopting the above technical solution, in the rinsing step, if the time interval is short (such as the time interval between each feeding), pure water is used to rinse the nozzle, thereby reducing the scale adhering to the nozzle. If the time interval is long (such as during shutdown or maintenance), an acidic solution is used to rinse, thereby reducing the scale residue on the nozzle.
[0012] In a preferred embodiment, this application can be further configured such that, during the detection step, the temperature of the bauxite is checked, and if the temperature is greater than 40 degrees Celsius, the spray volume is increased.
[0013] By adopting the above technical solution, namely by detecting the temperature of bauxite and increasing the spray volume when the temperature of bauxite is greater than 40 degrees Celsius, the problem of poor dust suppression effect caused by moisture evaporation can be further reduced.
[0014] In a preferred embodiment, this application can be further configured to continuously flush the nozzle during the feeding process until the feeding is complete.
[0015] By adopting the above technical solution, that is, continuously rinsing the nozzles when feeding material to the crushing equipment, the probability of impurities adhering to the nozzles during the feeding process can be reduced, and the bauxite and equipment can also be cooled down. Detailed Implementation
[0016] This application discloses a method for pulverizing and dust suppression in the production of aluminum hydroxide flame retardant, comprising the following steps: Crushing steps: A certain amount of bauxite is fed into the crushing equipment (feeding), then the crushing equipment is sealed (e.g., the inlet and / or outlet are covered), and then the crushing equipment crushes the bauxite; The testing steps include: checking the ambient temperature and adjusting the diameter of the water mist accordingly. When the ambient temperature is greater than 30 degrees Celsius, the diameter of the water mist should be adjusted to 12-20 μm and the nozzle height should be reduced. The temperature of the bauxite should also be checked. If the temperature is greater than 40 degrees Celsius, the spray volume should be increased. Spraying step: Water mist is sprayed on the crushing step, with a water mist diameter of 1–20 μm; after the current batch is crushed, the water mist diameter is maintained at 1–20 μm and spraying continues for 30s-60s before the discharge step. Discharge steps: Discharge the crushed bauxite; Rinsing steps: Obtain the time interval between the next crushing operation. If the time interval is short (such as the time interval between loading and unloading), rinse the nozzle with pure water. If the time interval is long (such as the time interval during shutdown or maintenance), rinse with an acidic solution (such as citric acid solution, acetic acid solution, dilute hydrochloric acid solution, etc.).
[0017] During material feeding, the crushing equipment runs continuously, and after feeding is completed, water mist spraying is performed. The diameter of the water mist is 20-50μm and lasts for 30-60 seconds. During this process, the gas inside the crushing equipment is drawn in. That is, during this process, the dust adhering to the crushing components will float due to the continuous operation of the crushing equipment, and then be captured by the water mist and discharged by suction. At the same time, the water mist diameter of 20-50μm can also effectively reduce the temperature when the water mist adheres to the crushing equipment or the crushing chamber. Thus, the impact of the crushing equipment and the temperature generated by crushing on the 1-20μm water mist diameter during the crushing process is reduced. During the feeding process, the ambient temperature is monitored. When the equipment temperature exceeds the preset value (which can be set as needed, such as 30 degrees Celsius), the nozzle is continuously rinsed until the feeding is completed. During this process, the rinsing liquid will drip onto the aluminum ore or the crushing components.
[0018] The implementation principle of this embodiment is as follows: when crushing bauxite, the spray water mist is adjusted according to the environment to maintain a good dust reduction effect.
[0019] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A method for pulverizing and reducing dust in the production of aluminum hydroxide flame retardant, characterized in that: The process includes the following steps: crushing step: crushing bauxite; spraying step: spraying water mist over the crushing step, with a water mist diameter of 1–20 μm; detection step: detecting the ambient temperature and adjusting the water mist diameter according to the ambient temperature.
2. The method for pulverizing and dust suppression in the production of aluminum hydroxide flame retardant according to claim 1, characterized in that: During the testing process, when the ambient temperature is greater than 30 degrees Celsius, adjust the diameter of the water mist to 12-20 μm and reduce the nozzle height.
3. The method for pulverizing and dust suppression in the production of aluminum hydroxide flame retardant according to claim 2, characterized in that: In the crushing step, intermittent feeding is adopted, and the crushing equipment is in a closed state during the crushing process; in the spraying step, after the current batch is crushed, the water mist diameter is maintained at 1–20μm and spraying continues for 30s–60s, followed by the discharge step: the crushed bauxite is discharged; the rinsing step: the nozzles are rinsed.
4. The method for pulverizing and dust suppression in the production of aluminum hydroxide flame retardant according to claim 3, characterized in that: During the rinsing step, the time interval between the next crushing operation is recorded. If the time interval is short, the nozzle is rinsed with pure water; if the time interval is long, it is rinsed with an acidic solution.
5. The method for pulverizing and dust suppression in the production of aluminum hydroxide flame retardant according to claim 2, characterized in that: During the testing process, the temperature of the bauxite is checked. If the temperature is greater than 40 degrees Celsius, the spraying volume is increased.
6. The method for pulverizing and dust suppression in the production of aluminum hydroxide flame retardant according to claim 4, characterized in that: During the feeding process, the nozzle is continuously rinsed until the feeding is complete.