Suspension staying roasting device for aluminum hydroxide

Abstract

The utility model relates to the technical field of nonferrous metallurgy, and discloses an aluminum hydroxide suspension staying roasting device which integrates an aluminum hydroxide feeding system, a drying system, a preheating system, a roasting system, a cooling system, a quantitative feeding belt weigher, a main fan, a dust remover, a burner station and other main equipment. A fluidized bed is embedded in the staying tank, the discharging amount can be adjusted and controlled to control the material level, and aluminum oxide fully roasted in the staying tank is cooled step by step through five-stage cyclones and finally discharged from a fifth-stage cyclone cooler. Fresh air entering the roasting furnace system from the fifth-stage cyclone cooler exchanges heat with aluminum oxide discharged from the staying tank, then is fed into the roasting furnace, is heated to a proper temperature through a main combustor in an inlet flue of the roasting furnace, enters the bottom of the roasting furnace to heat aluminum hydroxide and is taken out of the roasting furnace; high-temperature flue gas discharged from the roasting furnace enters preheating and drying equipment, passes through a dust remover after the temperature is reduced, and is fed into the atmosphere by a main fan.

Description

Technical Field

[0001] The utility model relates to the technical field of nonferrous metallurgy, in particular to a suspension dwelling roasting device for aluminum hydroxide. Background Art

[0002] The prior art is shown in CN103193400A, in which the process flow is as follows: aluminum hydroxide containing 5% to 8% water is dried and preheated to about 340°C, then enters a roasting furnace and is heated to above 1000°C, and after roasting, is cooled to below 80°C through a cooling section.

[0003] There are problems with the existing process flow and equipment. First, the roasting time is short and the time is uncontrollable. Second, the theoretical roasting temperature needs to be exceeded by about 100℃ to 200℃ to ensure product quality. Third, the α-AL2O3 in the product alumina is uncontrollable. Fourth, the fluidized bed cooler is not efficient enough, which often causes the product temperature to exceed 100℃. Fifth, the fluidized bed cooler wastes energy, transfers the heat of the product to the circulating water, which is then lost through the cooling tower, and the supporting fluidized bed fan consumes electricity. Sixth, the circulating water station cold water pump, hot water pump, and cooling tower supporting the fluidized bed cooler consume electricity and water. Equipment failure will also cause the roasting furnace to stop and stop production. Seventh, the dust collected by the dust collector is returned to the cooling cyclone and the crystallized water in it cannot be completely removed. Utility Model Content

[0004] The purpose of the utility model is to further reduce the heat consumption and power consumption of the existing aluminum hydroxide roasting furnace, improve product quality and reduce the failure rate of the roasting furnace system.

[0005] In order to achieve the above-mentioned object, the utility model provides a suspended dwell roasting device for aluminum hydroxide, comprising: a main fan, a dust collector, a first-stage cyclone cooler, a second-stage cyclone cooler, a third-stage cyclone cooler, a fourth-stage cyclone cooler, a fifth-stage cyclone cooler, a dwelling tank and a roasting furnace;

[0006] A accommodating space is provided in the retention tank, the retention tank is connected to a discharge pipe, an exhaust pipe, a fluidized bed, a first feed pipe and a second feed pipe, the fluidized bed is fixedly connected to the bottom of the retention tank, the exhaust pipe is used for exhausting gas, the discharge pipe passes through the fluidized bed, the upper end of the discharge pipe is accommodated in the accommodating space, the discharge pipe is provided with a control valve, the control valve is used to control the discharge amount of the discharge pipe, the first feed pipe and the second feed pipe are arranged at intervals on the left and right, the first feed pipe and the second feed pipe are both fixed to the top edge of the retention tank, and the lower ends contact the inner material surface of the retention tank;

[0007] The first-stage cyclone cooler, the second-stage cyclone cooler, the third-stage cyclone cooler, the fourth-stage cyclone cooler and the fifth-stage cyclone cooler are arranged in order from top to bottom;

[0008] The first feed pipe of the retention tank is used for feeding, the discharge pipe of the secondary cyclone cooler is connected to the feed pipe of the primary cyclone cooler, the outlet pipe of the primary cyclone cooler is connected to the roasting furnace, the discharge pipe of the primary cyclone cooler is connected to the feed pipe of the secondary cyclone cooler, the discharge pipe of the secondary cyclone cooler is connected to the inlet pipe of the third cyclone cooler, the outlet port of the secondary cyclone cooler is connected to the feed port of the first cyclone cooler, the outlet port of the third cyclone cooler is connected to the feed port of the second cyclone cooler, and the outlet port of the third cyclone cooler is connected to the fourth cyclone cooler. The feed port of the air cooler and the air outlet of the four-stage cyclone cooler are connected to the feed port of the three-stage cyclone cooler, the discharge port of the four-stage cyclone cooler is connected to the feed port of the five-stage cyclone cooler, the feed port of the five-stage cyclone cooler is connected to the atmosphere, and natural air enters the cooling system from there, the air outlet of the five-stage cyclone cooler is connected to the feed port of the four-stage cyclone cooler, the discharge port of the five-stage cyclone cooler is used to discharge the cooled alumina, the air outlet of the roasting furnace is connected to the dust collector, the discharge port of the dust collector is connected to the retention tank, and the air outlet of the dust collector is connected to the main fan.

[0009] Furthermore, the inner wall of the retention tank is also provided with an inner lining layer for high temperature resistance and wear resistance.

[0010] Furthermore, the suspended dwell roasting device for aluminum hydroxide further comprises a preheating cyclone, a dwell dust collector, a venturi dryer, and a drying cyclone;

[0011] The discharge port of the preheating cyclone is connected to the feed port of the roasting furnace, the outlet of the venturi dryer is connected to the drying cyclone, the air inlet of the residence dust collector is connected to the exhaust pipe, the exhaust port of the residence dust collector is connected to the feed port of the preheating cyclone, the discharge port of the residence dust collector is connected to the residence tank, the air outlet of the drying cyclone is connected to the dust collector, the discharge port of the drying cyclone is connected to the preheating cyclone, and the air outlet of the roasting furnace is connected to the dust collector through the preheating cyclone, the venturi dryer and the drying cyclone in sequence.

[0012] Furthermore, the suspended residence roasting device of aluminum hydroxide also includes a high-temperature cyclone, the air outlet of the high-temperature cyclone is connected to the preheating cyclone, the discharge port of the high-temperature cyclone is connected to the first feed pipe of the retention tank, the feed port of the high-temperature cyclone is connected to the roasting furnace, and the air outlet of the roasting furnace is connected to the dust collector through the high-temperature cyclone, the preheating cyclone, the Venturi dryer, and the drying cyclone in sequence.

[0013] Furthermore, the suspended dwell roasting device for aluminum hydroxide also includes a buffer bin, which is used to accommodate aluminum hydroxide, and the discharge port of the buffer bin is connected to the feed port of the drying cyclone through a Venturi dryer.

[0014] Furthermore, the suspended dwell roasting device for aluminum hydroxide also includes an electronic belt scale, and the discharge port of the buffer bin is connected to the feed port of the drying cyclone through the electronic belt scale and the Venturi dryer in sequence.

[0015] Furthermore, the suspended dwell roasting device for aluminum hydroxide also includes a vibrating feeder, and the buffer bin is connected to the Venturi dryer through the vibrating feeder.

[0016] Compared with the prior art, the present invention provides a suspension retention roasting device for aluminum hydroxide. The device has the following advantages: dust collected by the dust collector is transported to a retention tank, mixed with aluminum oxide at approximately 1000°C from a roasting furnace, and roasted again in the retention tank. The temperature of the retention tank is 900°C, and the aluminum oxide and dust remain in the storage space of the retention tank for approximately 10 minutes, achieving controllable aluminum oxide crystal transformation and achieving higher aluminum oxide product quality. The aluminum oxide is then discharged from the discharge pipe by adjusting the control valve. Compared with the prior art, the addition of a retention tank increases the aluminum oxide roasting time, reduces the roasting temperature in the roasting furnace, and reduces the natural gas usage of the roasting furnace. The alumina coming out of the retention tank is cooled by heat exchange with cold air from bottom to top through a first-stage cyclone cooler, a second-stage cyclone cooler, a third-stage cyclone cooler, a fourth-stage cyclone cooler, and a fifth-stage cyclone cooler. The temperature after cooling is about 80°C. It no longer needs to pass through a fluidized bed cooler and circulating cooling water for heat exchange cooling. Compared with the existing method of using a fluidized bed cooler to cool alumina, the heat utilization rate is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of an embodiment of the utility model;

[0018] Figure 2 It is a partial enlarged view of an embodiment of the present utility model.

[0019] In the figure, 1. Buffer bin; 2. Electronic belt scale; 3. Vibrating feeder; 4. Venturi dryer; 5. Drying cyclone; 6. Preheating cyclone; 7. Roasting furnace; 8. High-temperature cyclone;

[0020] 9. Stay tank; 91. Discharge pipe; 92. Exhaust pipe; 93. First feed pipe; 94. Fluidized bed; 95. Second feed pipe; 96. Fluidized air duct; 97. Controller;

[0021] 10. First-stage cyclone cooler; 11. Second-stage cyclone cooler; 12. Dust collector in the retention tank; 13. Third-stage cyclone cooler; 14. Fourth-stage cyclone cooler; 15. Fifth-stage cyclone cooler; 16. Dust collector; 17. Main fan. DETAILED DESCRIPTION

[0022] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0025] like Figures 1 and 2 As shown, the suspended dwell roasting device of aluminum hydroxide in a preferred embodiment of the present invention comprises: a main fan 17, a dust collector 16, a first-stage cyclone cooler 10, a second-stage cyclone cooler 11, a third-stage cyclone cooler 13, a fourth-stage cyclone cooler 14, a fifth-stage cyclone cooler 15, a dwelling tank 9 and a roasting furnace 7;

[0026] The retention tank 9 is provided with a accommodating space, and the retention tank 9 is connected to a discharge pipe 91, an exhaust pipe 92, a fluidized bed 94, a first feed pipe 93 and a second feed pipe 95. The fluidized bed 94 is fixedly connected to the bottom of the retention tank 9, and at least two fluidizing air ducts 96 are fixedly connected to the fluidized bed 94. The air is blown to the fluidized bed 94 through the fluidizing air ducts 96. As the velocity of the fluidized medium increases, the particles on the fluidized bed 94 begin to be affected by the buoyancy and resistance of the rising air flow. When the velocity of the fluidized medium reaches the minimum fluidizing velocity, the particles on the fluidized bed 94 will be suspended and The fluidized bed 94 is free to move, and the controller 97 is connected to the air inlet end of the exhaust pipe 92. The controller 97 is used to control the exhaust valve located on the exhaust pipe 92. The exhaust pipe 92 is used for exhausting gas. The discharge pipe 91 passes through the fluidized bed 94. The upper end of the discharge pipe 91 is accommodated in the accommodation space. The discharge pipe 91 is provided with a control valve. The control valve is used to control the discharge amount of the discharge pipe 91. The first feed pipe 93 and the second feed pipe 95 are arranged at intervals. The first feed pipe 93 and the second feed pipe 95 are both fixed to the top edge of the retention tank 9, and the lower ends contact the inner surface of the retention tank 9.

[0027] The first-stage cyclone cooler 10, the second-stage cyclone cooler 11, the third-stage cyclone cooler 13, the fourth-stage cyclone cooler 14, and the fifth-stage cyclone cooler 15 are arranged in order from top to bottom;

[0028] The first feed pipe 93 of the retention tank 9 is used for main process feeding, the discharge pipe of the secondary cyclone cooler 11 is connected to the feed pipe of the primary cyclone cooler 10, the outlet pipe of the primary cyclone cooler 10 is connected to the roasting furnace 7, the discharge pipe of the primary cyclone cooler 10 is connected to the feed pipe of the secondary cyclone cooler 11, the discharge pipe of the secondary cyclone cooler 11 is connected to the inlet pipe of the tertiary cyclone cooler 13, the outlet port of the secondary cyclone cooler 11 is connected to the feed port of the primary cyclone cooler 10, the outlet port of the tertiary cyclone cooler 13 is connected to the feed port of the secondary cyclone cooler 11, and the outlet port of the tertiary cyclone cooler 13 is connected to the fourth The feed port of the fourth-stage cyclone cooler 14 is connected to the feed port of the third-stage cyclone cooler 13, the discharge port of the fourth-stage cyclone cooler 14 is connected to the feed port of the fifth-stage cyclone cooler 15, and the feed port of the fifth-stage cyclone cooler 15 is communicated with the atmosphere, and natural air enters the cooling system from there. The outlet of the fifth-stage cyclone cooler 15 is connected to the feed port of the fourth-stage cyclone cooler 14, and the discharge port of the fifth-stage cyclone cooler 15 is used to discharge the cooled alumina, the outlet of the roasting furnace 7 is connected to the dust collector 16, the discharge port of the dust collector 16 is connected to the retention tank 9, and the outlet of the dust collector 16 is connected to the main fan 17.

[0029] Based on the above scheme, the working process of the utility model is as follows: aluminum hydroxide containing 5% to 8% water enters the roasting furnace 7 from the feed port of the roasting furnace 7, the roasting furnace 7 uses natural gas or coal gas as fuel, the roasting furnace top temperature is controlled at about 1000°C, and the aluminum hydroxide is converted into aluminum oxide. At this time, the aluminum oxide enters the high-temperature cyclone separator 8 from the roasting furnace 7, and the separated aluminum oxide enters the accommodating space of the retention tank 9 through the first feed pipe 93 of the retention tank 9 from the discharge port. By controlling the flow rate of the control valve, the aluminum oxide stays in the retention tank 9 for about 10 minutes, so that the aluminum oxide further undergoes crystal transformation. The aluminum oxide in the retention tank 9 passes through the discharge pipe 91 in sequence through the first cyclone cooler 10, the second cyclone cooler 11, the third cyclone cooler 13, the fourth cyclone cooler 14, and the fifth cyclone cooler 15. After the aluminum oxide is fully cooled, it enters the conveyor belt or the air chute for storage. The high-temperature flue gas from the roasting furnace 7 is cooled after being preheated and dried to form aluminum hydroxide. After the dust is removed by the dust collector 16, the gas is discharged from the air outlet of the dust collector 16 through the main fan 17. The dust in the dust collector 16 is aluminum hydroxide and a small amount of uncrystallized aluminum oxide. The dust enters the retention tank 9 from the discharge port of the dust collector 16 to react again.

[0030] The dust collected by dust collector 16 is transported to retention tank 9, where it is mixed with alumina at approximately 1000°C from the roasting furnace and roasted again in the retention tank. The temperature of retention tank 9 is approximately 950°C. The alumina and dust remain in the storage space of retention tank 9 for approximately 10 minutes, achieving controllable alumina crystal transformation and achieving higher alumina product quality. The alumina is then discharged from the discharge pipe by adjusting the control valve. Compared with the existing technology, the addition of retention tank 9 increases the alumina roasting time, reduces the roasting temperature of alumina in roasting furnace 7, and reduces the natural gas usage of roasting furnace 7. The aluminum oxide coming out of the retention tank 9 passes through the first-stage cyclone cooler 10, the second-stage cyclone cooler 11, the third-stage cyclone cooler 13, the fourth-stage cyclone cooler 14, and the fifth-stage cyclone cooler 15 to exchange heat with the cold air from bottom to top. The five cyclone coolers are arranged in sequence from top to bottom. The external cold air enters from the feed port of the fifth-stage cyclone cooler 15. The roasted aluminum oxide passes through the first-stage cyclone cooler 10, the second-stage cyclone cooler 11, the third-stage cyclone cooler 13, the fourth-stage cyclone cooler 14, and the fifth-stage cyclone cooler 15 from top to bottom to fully exchange heat in countercurrent. The temperature of the cooled aluminum oxide is about 80°C. The high-temperature gas coming out of the roasting furnace 7 is preheated and dried for aluminum hydroxide, and then the heat is recovered and the temperature is reduced. It is then discharged into the atmosphere through the dust collector 16 and the main fan 17.

[0031] Further preferably, the retention tank 9 is provided with a material level detector to detect how much of the storage space the material in the retention tank 9 occupies. The material in the retention tank 9 is 30% to 60% of the storage space. The reaction in the retention tank 9 is continuous, with material continuously entering through the first feed pipe 93 and continuously being discharged through the discharge pipe 91. The discharge amount of the discharge pipe 91 is controlled by the control valve, and the coordinated action of the control valve and the detector adjusts the material level to control the degree of alumina crystal transformation.

[0032] Preferably, the inner wall of the storage space of the retention tank 9 is also provided with a high-temperature and wear-resistant lining layer. The lining layer is provided on the inner wall of the retention tank 9 and can withstand temperatures exceeding 1200°C, protecting the equipment from high-temperature damage and ensuring long-term stable operation of the equipment in a high-temperature roasting environment.

[0033] Preferably, the suspended roasting device of aluminum hydroxide also includes a preheating cyclone 6, a residence dust collector 12, a drying cyclone 5 and a Venturi dryer 4, the outlet of the Venturi dryer 4 is connected to the drying cyclone 5, the air inlet of the residence dust collector 12 is connected to the exhaust pipe 92, the exhaust port of the residence dust collector 12 is connected to the feed port of the preheating cyclone 6, the discharge port of the residence dust collector 12 is connected to the residence tank 9 through the second feed pipe 95, the air outlet of the drying cyclone 5 is connected to the dust collector 16, the discharge port of the drying cyclone 5 is connected to the preheating cyclone 6, and the air outlet of the roasting furnace 7 is connected to the dust collector 16 through the preheating cyclone 6, the Venturi dryer 4 and the drying cyclone 5 in sequence.

[0034] The aluminum hydroxide in the preheating cyclone 6 enters the roasting furnace 7 after removing part of the crystal water, which helps to reduce the energy consumption of the roasting furnace 7. The discharge port of the preheating cyclone 6 is directly connected to the feed port of the roasting furnace 7, and the gas outlet of the preheating cyclone 6 is connected to the dust collector 16 to separate the aluminum hydroxide dust and waste gas in the gas.

[0035] The drying cyclone 5 is used to separate the dried and dehydrated aluminum hydroxide and waste gas. The feed port of the drying cyclone 5 receives aluminum hydroxide, the air outlet of the drying cyclone 5 is connected to the dust collector 16, and the discharge port of the drying cyclone 5 is connected to the preheating cyclone 6, forming a drying process for aluminum hydroxide.

[0036] The venturi dryer 4 removes free water through direct contact between high-temperature, high-speed airflow and aluminum hydroxide. The air outlet of the preheating cyclone 6 is connected to the drying cyclone 5 through the venturi dryer 4, so that the aluminum hydroxide entering the roasting furnace 7 does not contain free water.

[0037] The air inlet of the retention dust collector 12 is connected to the exhaust pipe 92 of the retention tank 9. It is used to collect and treat the dust in the exhaust gas discharged from the retention tank 9. The dust is aluminum oxide. The exhaust port of the retention dust collector 12 is connected to the feed port of the preheating cyclone 6 to return the treated high-temperature gas to the system for recycling. The discharge port of the retention dust collector 12 is connected back to the retention tank 9 to recycle the collected dust.

[0038] Preferably, the suspension roasting device for aluminum hydroxide also includes a drying cyclone 5, the aluminum hydroxide and gas from the venturi dryer 4 enter the feed port of the drying cyclone 5, the air outlet of the drying cyclone 5 is connected to the dust collector 16, the discharge port of the drying cyclone 5 is connected to the preheating cyclone 6, and the air outlet of the roasting furnace 7 is connected to the dust collector 16 through the preheating cyclone 6 and the drying cyclone 5 in sequence.

[0039] Preferably, the suspension roasting apparatus for aluminum hydroxide further comprises a high-temperature cyclone 8, the outlet of which is connected to the preheating cyclone 6, the discharge port of which is connected to the feed pipe of the retention tank 9, the feed port of which is connected to the roasting furnace 7, and the outlet of the roasting furnace 7 is connected to the dust collector 16 through the high-temperature cyclone 8, the preheating cyclone 6, the venturi dryer 4, and the drying cyclone 5 in sequence. The high-temperature cyclone 8 is used to recover high-temperature gas and unreacted aluminum hydroxide from the discharge of the roasting furnace 7. These high-temperature gas and aluminum hydroxide are returned to the system for reuse, thereby improving energy efficiency. The outlet of the high-temperature cyclone 8 is connected to the preheating cyclone 6 so that the high-temperature gas heats the aluminum hydroxide in the preheating cyclone 6, while the discharge port of the high-temperature cyclone 8 is connected to the feed port of the retention tank 9, so that the unreacted aluminum hydroxide can fully react in the retention tank 9.

[0040] Preferably, the suspension roasting device for aluminum hydroxide further includes a surge bin 1 for accommodating aluminum hydroxide, the discharge port of which is connected to the feed port of the drying cyclone 5 via a venturi dryer 4. The surge bin 1 is used to store and regulate the amount of aluminum hydroxide entering the roasting furnace 7, ensuring the stability and continuity of the system operation. The discharge port of the surge bin 1 is connected to the drying cyclone 5 via the venturi dryer 4, achieving smooth material transportation.

[0041] Preferably, the suspension dwell roasting apparatus for aluminum hydroxide further includes an electronic belt scale 2. The discharge port of the surge bin 1 is connected to the feed port of the drying cyclone 5 via the electronic belt scale 2 and the venturi dryer 4 in sequence. The electronic belt scale 2 is installed between the discharge port of the surge bin 1 and the venturi dryer 4 to accurately measure the amount of aluminum hydroxide entering the system, thereby facilitating precise control and optimization of the production process.

[0042] It is further preferred that the main fan 17 is an existing main fan modified by an impeller using three-dimensional flow technology. First, the air volume can be increased by more than 10%, ensuring the cooling effect of the first-stage cyclone cooler 10, the second-stage cyclone cooler 11, the third-stage cyclone cooler 13, the fourth-stage cyclone cooler 14, and the fifth-stage cyclone cooler 15. At the same time, the output of the roasting furnace 7 can be further increased. Secondly, while increasing the output, the power consumption can be reduced by about 20 to 30%.

[0043] Preferably, the suspension roasting apparatus for aluminum hydroxide further includes a vibrating feeder 3. The aluminum hydroxide in the surge bin 1 is fed to the vibrating feeder 3 via an electronic belt scale and connected to a venturi dryer 4. The vibrating feeder 3 replaces the screw conveyor in the prior art, reducing power consumption and equipment loss.

[0044] In summary, the embodiment of the present invention provides a suspended retention roasting device for aluminum hydroxide, which transports the dust collected by the dust collector 16 to the retention tank 9, mixes it with the aluminum oxide at about 1000°C from the roasting furnace, and roasts it again in the retention tank. The temperature of the retention tank 9 is about 950°C. The aluminum oxide and dust stay in the accommodation space of the retention tank 9 for about 10 minutes, achieving controllable aluminum oxide crystal transformation and achieving higher aluminum oxide product quality. The aluminum oxide is then discharged from the discharge pipe by adjusting the control valve. Compared with the prior art, the roasting time of the aluminum oxide is increased by adding a retention tank, the roasting temperature of the aluminum oxide in the roasting furnace 7 is reduced, and the natural gas usage of the roasting furnace 7 is reduced. The alumina exiting the retention tank passes through the primary cyclone cooler 10, secondary cyclone cooler 11, tertiary cyclone cooler 13, quaternary cyclone cooler 14, and fifth cyclone cooler 15, where it is cooled by heat exchange with cold air flowing upward. The five cyclone coolers are arranged in a sequential order from top to bottom, with external cold air entering through the inlet pipe of the fifth cyclone cooler 15. The calcined alumina passes through the primary cyclone cooler 10, secondary cyclone cooler 11, tertiary cyclone cooler 13, quaternary cyclone cooler 14, and fifth cyclone cooler 15 from top to bottom, undergoing sufficient countercurrent heat exchange. The cooled alumina reaches a temperature of approximately 80°C, eliminating the need for heat exchange with circulating cooling water in a fluidized bed cooler. Advanced ternary flow technology is used to improve the main fan, increasing air volume to meet the requirements of the five-stage cyclone cooling while reducing power consumption and costs.

[0045] Therefore, this invention can reduce fuel, electricity, and water consumption in alumina production, lowering the average production cost by at least 3 yuan per ton of alumina. For example, when using natural gas as fuel, a 2 million ton alumina plant can save 6 million yuan annually and reduce carbon emissions by 36,000 tons. With China's alumina production reaching over 71 million tons in 2023, this invention has significant implications for energy conservation and reduction in my country, potentially reducing alumina roasting costs by 210 million yuan annually.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A suspended roasting device for aluminum hydroxide, characterized in that: include: Main fan, dust collector, first-stage cyclone cooler, second-stage cyclone cooler, third-stage cyclone cooler, fourth-stage cyclone cooler, fifth-stage cyclone cooler, retention tank, high-temperature cyclone separator and roasting furnace; The retention tank is provided with an accommodating space, the retention tank is connected with a discharge pipe, an exhaust pipe, a fluidized bed, a first feed pipe and a second feed pipe, the fluidized bed is fixedly connected to the bottom of the retention tank, the exhaust pipe is used for exhausting gas, the discharge pipe passes through the fluidized bed, the upper end of the discharge pipe is accommodated in the accommodating space, the discharge pipe is provided with a control valve, the control valve is used to control the discharge amount of the discharge pipe, the first feed pipe and the second feed pipe are arranged at intervals on the left and right, the first feed pipe and the second feed pipe are both fixed to the top edge of the retention tank, and the lower ends thereof contact the inner material surface of the retention tank; The first-stage cyclone cooler, the second-stage cyclone cooler, the third-stage cyclone cooler, the fourth-stage cyclone cooler, and the fifth-stage cyclone cooler are arranged in order from top to bottom; The first feed pipe of the retention tank is used to connect the discharge port of the high-temperature cyclone separator to feed, the discharge pipe of the secondary cyclone cooler is connected to the feed pipe of the primary cyclone cooler, the outlet pipe of the primary cyclone cooler is connected to the roasting furnace, the discharge pipe of the primary cyclone cooler is connected to the feed pipe of the secondary cyclone cooler, the discharge pipe of the secondary cyclone cooler is connected to the inlet pipe of the tertiary cyclone cooler, the outlet port of the secondary cyclone cooler is connected to the feed port of the primary cyclone cooler, the outlet port of the third cyclone cooler is connected to the feed port of the secondary cyclone cooler, and the outlet port of the third cyclone cooler is connected to the feed port of the second cyclone cooler. The feed port is connected to the feed port of the four-stage cyclone cooler, the air outlet of the four-stage cyclone cooler is connected to the feed port of the three-stage cyclone cooler, the discharge port of the four-stage cyclone cooler is connected to the feed port of the five-stage cyclone cooler, the feed port of the five-stage cyclone cooler is communicated with the atmosphere, and natural air enters the cooling system from there, the air outlet of the five-stage cyclone cooler is connected to the feed port of the four-stage cyclone cooler, the discharge port of the five-stage cyclone cooler is used to discharge the cooled alumina, the air outlet of the roasting furnace is connected to the dust collector, the discharge port of the dust collector is connected to the retention tank, and the air outlet of the dust collector is connected to the main fan.

2. The suspended roasting device for aluminum hydroxide according to claim 1, characterized in that: The inner wall of the retention tank is also provided with an inner lining layer for high temperature resistance and wear resistance.

3. The suspended roasting device of aluminum hydroxide according to claim 1, characterized in that Also includes preheat cyclone, stationary dust collector, venturi dryer and drying cyclone; The discharge port of the preheating cyclone is connected to the feed port of the roasting furnace, the outlet of the venturi dryer is connected to the drying cyclone, the air inlet of the residence dust collector is connected to the exhaust pipe, the exhaust port of the residence dust collector is connected to the feed port of the preheating cyclone, the discharge port of the residence dust collector is connected to the residence tank through the second feed pipe, the air outlet of the drying cyclone is connected to the dust collector, the discharge port of the drying cyclone is connected to the feed port of the preheating cyclone, and the air outlet of the roasting furnace is connected to the dust collector through the preheating cyclone, the venturi dryer and the drying cyclone in sequence.

4. The suspended roasting device for aluminum hydroxide according to claim 3, characterized in that: It also includes a high-temperature cyclone, the air outlet of the high-temperature cyclone is connected to the feed port of the preheating cyclone, the discharge port of the high-temperature cyclone is connected to the first feed pipe of the retention tank, the feed port of the high-temperature cyclone is connected to the roasting furnace, and the air outlet of the roasting furnace is connected to the dust collector through the high-temperature cyclone, the preheating cyclone, the Venturi dryer, and the drying cyclone in sequence.

5. The suspended roasting device for aluminum hydroxide according to claim 4, characterized in that: It also includes a buffer bin, which is used to accommodate aluminum hydroxide, and the discharge port of the buffer bin is connected to the feed port of the drying cyclone through the Venturi dryer.

6. The suspended roasting device for aluminum hydroxide according to claim 5, characterized in that , also includes an electronic belt scale, and the discharge port of the buffer bin is connected to the feed port of the drying cyclone through the electronic belt scale and the Venturi dryer in sequence.

7. The suspended roasting device for aluminum hydroxide according to claim 6, characterized in that: It also includes a vibrating feeder, and the buffer bin is connected to the venturi dryer through the vibrating feeder.

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