Circulating drying equipment for micro-powder-grade aluminum hydroxide production

Abstract

The utility model discloses circulating drying equipment for producing micro-powder-grade aluminum hydroxide, which belongs to the technical field of circulating drying of aluminum hydroxide and comprises a raw material storage unit, a drying unit, a drying unit and a drying unit, and is characterized in that the raw material storage unit is used for receiving wet aluminum hydroxide powder conveyed from the outside; the particle size pretreatment unit is used for homogenizing wet aluminum hydroxide powder; the circulation drying unit and the heat supply unit are used for conducting circulation drying on the moist aluminum hydroxide powder subjected to homogenization treatment, and the heat supply unit is used for providing a heat source; the cooling unit is used for cooling the aluminum hydroxide powder dried in the circulating drying unit; and the finished product storage unit is used for storing the cooled aluminum hydroxide powder. According to the circulating drying device, through the synergistic effect of the preheating tank and the circulating drying tank, multi-stage utilization of heat and circulating drying of materials are achieved. The design not only accelerates the drying process of the aluminum hydroxide powder, but also improves the drying efficiency, so that more materials can be treated in unit time.

Description

Technical Field

[0001] This utility model relates to the field of aluminum hydroxide circulating drying technology, specifically to a circulating drying equipment for the production of micronized aluminum hydroxide. Background Technology

[0002] Micronized aluminum hydroxide, as an important industrial raw material, has wide applications in ceramics, refractories, electronic packaging, and catalyst supports. However, during processing and use, micronized aluminum hydroxide often requires drying to remove moisture, thereby improving its performance and stability. Traditional drying processes for micronized aluminum hydroxide often suffer from low efficiency, high energy consumption, and unstable product quality, which to some extent limits its application scope and market competitiveness.

[0003] To address these issues, the industry has begun exploring more efficient, energy-saving, and environmentally friendly drying processes for micronized aluminum hydroxide. Among these, the circulating drying process has attracted significant attention due to its advantages, including full utilization of thermal energy, improved drying efficiency, and reduced energy consumption.

[0004] Chinese Patent Publication No. CN220793903U discloses an aluminum hydroxide drying and calcining system, which includes a drying device, a preheating device, a calcining furnace and a cooling device connected in sequence. A material distribution device is provided between the preheating device and the calcining furnace. At least one discharge end of the material distribution device is connected to the calcining furnace and at least another discharge end is connected to a heat exchanger for producing dried aluminum hydroxide.

[0005] However, in the aforementioned patent, although the Venturi dryer can process a large amount of wet materials, the heat of the high-temperature flue gas cannot be fully utilized, which leads to increased energy consumption. In addition, a large amount of wet materials are prone to agglomeration in the conveying pipeline, causing pipeline blockage, thereby reducing production efficiency and increasing maintenance costs.

[0006] Based on this, this utility model designs a circulating drying device for the production of micronized aluminum hydroxide to solve the above problems. Utility Model Content

[0007] In view of the above-mentioned shortcomings of the existing technology, this utility model provides a circulating drying equipment for the production of micronized aluminum hydroxide.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A circulating drying device for producing micronized aluminum hydroxide includes:

[0010] Raw material storage unit for receiving moist aluminum hydroxide powder transported from outside;

[0011] The particle size pretreatment unit is connected to the raw material storage unit via pipeline and is used for homogenizing moist aluminum hydroxide powder;

[0012] The circulating drying unit and the heating unit are connected by pipelines to the particle size pretreatment unit for circulating drying of homogenized moist aluminum hydroxide powder, and the heating unit is used to provide a heat source.

[0013] The circulating drying unit includes a preheating tank and a circulating drying tank, and the heating unit provides a heat source to the circulating drying tank and the preheating tank in sequence.

[0014] The cooling unit is connected to the pumping pipeline of the circulating dryer and is used to cool the aluminum hydroxide powder that has been dried in the circulating dryer.

[0015] The finished product storage unit is connected to the cooling unit via piping and is used to store the cooled aluminum hydroxide powder.

[0016] Preferably, the raw material storage unit is a storage silo, and the inside of the storage silo is equipped with a dehumidification and temperature control system to prevent the agglomeration of moist aluminum hydroxide powder. The outlet of the storage silo is connected to the pipeline of the particle size pretreatment unit.

[0017] Preferably, the particle size pretreatment unit includes a crusher and a multi-stage screen. The crusher has two sets of feed inlets, one set of which is connected to the discharge outlet of the storage silo. The multi-stage screen has two sets of discharge outlets, one for large-diameter particles and the other for homogeneous small particles. The other set of feed inlets of the crusher is connected to the large-diameter discharge outlet of the multi-stage screen, and the homogeneous small particle discharge outlet of the multi-stage screen is connected to the circulating drying unit.

[0018] Preferably, the heating unit is a high-temperature flue gas generator. The high-temperature flue gas generated by the high-temperature flue gas generator is connected to the lower air inlet of the circulating dryer through a pipeline. The upper air outlet of the circulating dryer is connected to the lower air inlet of the preheating tank through a pipeline. The upper air outlet of the circulating dryer is connected to a flue gas recovery tank through a pipeline.

[0019] Preferably, the outlet of the homogeneous small particles of the multi-stage screen is connected to the inlet pipe of the preheating tank, and the outlet of the preheating tank is connected to the inlet pipe of the circulating drying tank.

[0020] Preferably, the circulating drying tank is equipped with a circulating pump, which is connected to the discharge port at the lower end of the circulating drying tank and the inlet at the upper end of the circulating drying tank via pipelines. The circulating pump is equipped with an aluminum hydroxide moisture analyzer and has two sets of discharge ports.

[0021] Preferably, the cooling unit is a cooling tower, one set of the discharge ports of the circulating pump is connected to the inlet pipe at the upper end of the cooling tower, and the discharge port at the lower end of the cooling tower is connected to the finished product storage unit.

[0022] Preferably, the finished product storage unit is a sealed product storage tank, and the lower outlet of the cooling tower is connected to the upper inlet of the sealed product storage tank via a pipeline.

[0023] Compared with the prior art, the advantages of this utility model are as follows:

[0024] 1. This invention achieves multi-stage heat utilization and material circulation drying through the synergistic effect of a preheating tank and a circulating drying tank. This design not only accelerates the drying process of aluminum hydroxide powder but also improves drying efficiency, enabling the processing of more material per unit time.

[0025] 2. This utility model employs a high-temperature flue gas generator in its heating unit. The generated high-temperature flue gas is first used in the drying process of the circulating drying tank. Subsequently, the flue gas with residual heat enters the preheating tank to preheat the aluminum hydroxide powder, and finally, it is discharged into the flue gas recovery tank for recycling. This process achieves efficient utilization of heat, reduces energy consumption, and lowers production costs.

[0026] 3. This invention, through the combined use of a crusher and multi-stage screens in a particle size pretreatment unit, ensures uniform particle size of the aluminum hydroxide powder entering the drying system, meeting the stringent particle size requirements of the drying process. This not only improves product uniformity but also guarantees product quality stability. The aluminum hydroxide moisture analyzer on the circulating drying tank can monitor the material's moisture content in real time. When the moisture content is below standard, the material can be automatically pumped back to the circulating drying tank for re-drying until the moisture content meets the standard. This design ensures the final product's pass rate and consistency.

[0027] 4. This invention incorporates a dehumidification and temperature control system within the raw material storage unit, effectively preventing the agglomeration of damp aluminum hydroxide powder and avoiding pipeline blockage caused by material agglomeration during transportation. This not only improves production efficiency but also reduces maintenance costs. The material disperser installed inside the circulating drying tank increases the contact area between the high-temperature flue gas and the aluminum hydroxide powder, while simultaneously agitating the surrounding hot airflow, further improving drying efficiency and helping to prevent material agglomeration during the drying process. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the process structure of a circulating drying equipment for the production of micronized aluminum hydroxide according to this utility model.

[0030] The labels in the diagram represent:

[0031] 1. Storage silo; 2. Crusher; 3. Multi-stage screen; 4. Preheating tank; 5. Circulating drying tank; 6. Cooling tower; 7. Sealed product storage tank; 8. High-temperature flue gas generator; 9. Flue gas recovery pool. Detailed Implementation

[0032] 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, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0033] In some embodiments, please refer to the accompanying drawings. Figure 1 A circulating drying device for producing micronized aluminum hydroxide includes: a raw material storage unit for receiving moist aluminum hydroxide powder transported from an external source; a particle size pretreatment unit connected to the raw material storage unit via pipeline for homogenizing the moist aluminum hydroxide powder; a circulating drying unit and a heating unit, wherein the circulating drying unit and the particle size pretreatment unit are connected via pipeline for circulating drying of the homogenized moist aluminum hydroxide powder, and the heating unit provides a heat source; the circulating drying unit includes a preheating tank 4 and a circulating drying tank 5, and the heating unit provides a heat source to the circulating drying tank 5 and the preheating tank 4 in sequence; a cooling unit connected to the circulating drying tank 5 via pump pipeline for cooling the aluminum hydroxide powder dried in the circulating drying unit; and a finished product storage unit connected to the cooling unit via pipeline for storing the cooled aluminum hydroxide powder.

[0034] In this embodiment, the raw material storage unit is a storage silo 1, and the storage silo 1 is equipped with a dehumidification and temperature control system to prevent the agglomeration of moist aluminum hydroxide powder.

[0035] The dehumidification system consists of a compressor, a refrigeration coil (heat exchanger), a fan, and a dehumidifier.

[0036] The temperature control system consists of a temperature sensor, a regulator, and an actuator. The actuator includes, but is not limited to, a controllable heat exchanger, an electric heater, and a refrigeration compressor. The aforementioned dehumidification and temperature control systems are mature existing technologies and are not within the protection scope of this utility model. Only their functions are described, and their specific working principles, circuit signal transmissions, etc., are not elaborated.

[0037] The discharge port of storage silo 1 is connected to the pipeline of the particle size pretreatment unit;

[0038] The particle size pretreatment unit includes a crusher 2 and a multi-stage screen 3. The crusher 2 has two sets of feed inlets. One set of feed inlets is connected to the discharge outlet of the storage silo 1. The multi-stage screen 3 has two sets of discharge outlets, namely a large particle discharge outlet and a homogeneous small particle discharge outlet. The other set of feed inlets of the crusher 2 is connected to the large particle discharge outlet of the multi-stage screen 3. The homogeneous small particle discharge outlet of the multi-stage screen 3 is connected to the circulating drying unit pipeline.

[0039] In this embodiment, the heating unit is a high-temperature flue gas generator 8. The high-temperature flue gas generated by the high-temperature flue gas generator 8 is connected to the lower air inlet of the circulating drying tank 5 through a pipeline. The upper air outlet of the circulating drying tank 5 is connected to the lower air inlet of the preheating tank 4 through a pipeline. The upper air outlet of the circulating drying tank 5 is connected to a flue gas recovery tank 9 through a pipeline.

[0040] In this embodiment, the outlet of the homogeneous small particles of the multi-stage screen 3 is connected to the inlet pipe of the preheating tank 4, and the outlet of the preheating tank 4 is connected to the inlet pipe of the circulating drying tank 5.

[0041] In this embodiment, a circulation pump is installed on the circulating drying tank 5. The circulation pump is connected to the discharge port at the lower end of the circulating drying tank 5 and the inlet port at the upper end of the circulating drying tank 5 through pipelines. An aluminum hydroxide moisture analyzer is installed on the circulation pump, and the circulation pump has two sets of discharge ports.

[0042] In this embodiment, the cooling unit is a cooling tower 6. One set of discharge ports of the circulating pump is connected to the inlet pipe at the upper end of the cooling tower 6, and the discharge port at the lower end of the cooling tower 6 is connected to the finished product storage unit.

[0043] In this embodiment, the finished product storage unit is a sealed product storage tank 7, and the lower outlet of the cooling tower 6 is connected to the upper inlet of the sealed product storage tank 7 via a pipeline.

[0044] In this embodiment, the moist aluminum hydroxide powder is first transported to the inside of the storage silo 1 through an external conveying pipeline and stored in the storage silo 1 equipped with a dehumidification and temperature control system to prevent it from getting damp and agglomerating. The aluminum hydroxide powder is then fed into the crusher 2 through the discharge port at the bottom of the storage silo 1 for fine crushing to ensure that the particle size uniformity of the material meets the predetermined requirements. The aluminum hydroxide powder after being finely crushed by the crusher 2 is then screened by a multi-stage screen 3 to classify the material. The aluminum hydroxide powder particles that are too large are pumped back to the crusher 2 by a conveying pump for secondary fine crushing to meet the strict requirements of the drying process for the particle size of the material. The aluminum hydroxide powder after being screened by the multi-stage screen 3 is then conveyed to the preheating tank 4 for preheating.

[0045] After being preheated in the preheating tank 4, the aluminum hydroxide powder is transported to the circulating drying tank 5 for circulating drying. The heat source for the circulating drying tank 5 is provided by the high-temperature flue gas generator 8. The high-temperature flue gas generated by the high-temperature flue gas generator 8 is first transported to the circulating drying tank 5 to dry the aluminum hydroxide powder in the circulating drying tank 5. The high-temperature flue gas with residual heat enters the preheating tank 4 through the gas outlet at the top of the circulating drying tank 5, providing the preheating tank 4 with a heat source for preheating the aluminum hydroxide powder. Then, it is discharged into the flue gas recovery pool 9 through the gas outlet of the preheating tank 4 for recovery. In this process, after two heat transfers, not only is the heat utilization rate of the high-temperature flue gas effectively improved and the increase in energy consumption reduced, but also, due to the addition of the preheating step, the aluminum hydroxide powder entering the circulating drying tank 5 can be further dried more quickly.

[0046] It is worth mentioning that the circulating pump on the circulating drying tank 5 is equipped with an aluminum hydroxide moisture detector. When the moisture content of the aluminum hydroxide powder does not meet the standard, it will be monitored by the aluminum hydroxide moisture detector and pumped back to the circulating drying tank 5 for re-drying. This cycle continues until the moisture content of the aluminum hydroxide powder meets the standard.

[0047] The circulating drying tank 5 is equipped with a material disperser to increase the contact area between the high-temperature flue gas and the aluminum hydroxide powder. In addition, the material disperser agitates the surrounding hot air flow during rotation, further improving the drying efficiency of the aluminum hydroxide powder in the circulating drying tank 5.

[0048] Finally, the aluminum hydroxide powder that meets the moisture content standard is pumped to cooling tower 6 for cooling via a circulating pump, and then transported to sealed product storage tank 7 for storage and future use.

[0049] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A circulating drying device for the production of micronized aluminum hydroxide, characterized in that, include: Raw material storage unit for receiving moist aluminum hydroxide powder transported from outside; The particle size pretreatment unit is connected to the raw material storage unit via pipeline and is used for homogenizing moist aluminum hydroxide powder; The circulating drying unit and the heating unit are connected by pipelines to the particle size pretreatment unit for circulating drying of homogenized moist aluminum hydroxide powder, and the heating unit is used to provide a heat source. The circulating drying unit includes a preheating tank (4) and a circulating drying tank (5), and the heating unit provides a heat source to the circulating drying tank (5) and the preheating tank (4) in sequence; The cooling unit is connected to the pumping pipeline of the circulating drying tank (5) and is used to cool the aluminum hydroxide powder that has been dried in the circulating drying unit. The finished product storage unit is connected to the cooling unit via piping and is used to store the cooled aluminum hydroxide powder.

2. The circulating drying equipment for producing micronized aluminum hydroxide according to claim 1, characterized in that, The raw material storage unit is a storage silo (1). The storage silo (1) is equipped with a dehumidification and temperature control system to prevent the agglomeration of moist aluminum hydroxide powder. The outlet of the storage silo (1) is connected to the pipeline of the particle size pretreatment unit.

3. The circulating drying equipment for producing micronized aluminum hydroxide according to claim 2, characterized in that, The particle size pretreatment unit includes a crusher (2) and a multi-stage screen (3). The crusher (2) has two sets of feed inlets. One set of feed inlets is connected to the discharge outlet of the storage bin (1). The multi-stage screen (3) has two sets of discharge outlets, namely a large particle discharge outlet and a homogeneous small particle discharge outlet. The other set of feed inlets of the crusher (2) is connected to the large particle discharge outlet of the multi-stage screen (3) through a pipeline. The homogeneous small particle discharge outlet of the multi-stage screen (3) is connected to the circulating drying unit through a pipeline.

4. The circulating drying equipment for producing micronized aluminum hydroxide according to claim 3, characterized in that, The heating unit is a high-temperature flue gas generator (8). The high-temperature flue gas generated by the high-temperature flue gas generator (8) is connected to the lower air inlet of the circulating dryer (5) through a pipeline. The upper air outlet of the circulating dryer (5) is connected to the lower air inlet of the preheating tank (4) through a pipeline. The upper air outlet of the circulating dryer (5) is connected to a flue gas recovery tank (9) through a pipeline.

5. The circulating drying equipment for producing micronized aluminum hydroxide according to claim 4, characterized in that, The outlet of the homogeneous small particles of the multi-stage screen (3) is connected to the inlet pipe of the preheating tank (4), and the outlet of the preheating tank (4) is connected to the inlet pipe of the circulating drying tank (5).

6. The circulating drying equipment for producing micronized aluminum hydroxide according to claim 5, characterized in that, The circulating drying tank (5) is equipped with a circulating pump. The circulating pump is connected to the discharge port at the lower end of the circulating drying tank (5) and the inlet port at the upper end of the circulating drying tank (5) through pipelines. The circulating pump is equipped with an aluminum hydroxide moisture detector and has two sets of discharge ports.

7. The circulating drying equipment for producing micronized aluminum hydroxide according to claim 6, characterized in that, The cooling unit is a cooling tower (6). One of the outlets of the circulating pump is connected to the inlet pipe at the top of the cooling tower (6), and the outlet at the bottom of the cooling tower (6) is connected to the finished product storage unit.

8. The circulating drying equipment for producing micronized aluminum hydroxide according to claim 7, characterized in that, The finished product storage unit is a sealed product storage tank (7), and the lower end outlet of the cooling tower (6) and the upper end inlet of the sealed product storage tank (7) are connected by a pipeline.

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