Wet aluminum hydroxide containing 10% to 15% of attached water at a temperature of about 50°C is sent to aluminum hydroxide storage bin L01 by a conveyor belt conveyor, and the wet aluminum hydroxide is discharged through the warehouse at the bottom of the electronic belt scale (metering, spiral feeding The machine feeds aluminum hydroxide to the venturi dryer (A02).

Aqueous aluminum hydroxide is blown away by the hot gas from the preheating cyclone P02 and the drying heat generator T11 (about 340°C) and rapidly dried. The dried mixed gas of aluminum hydroxide and water vapor is about 150°C. The tube enters the first cyclone (P01) separation, after separation, the dry aluminum hydroxide and the hot gas from 1000°C to 1200°C from the cyclone P03 are fully mixed, and the material that is separated from the P02 is preheated and pre-baked in the P02 ( The temperature is about 320°C-360°C) and enters the roasting furnace P04 in a direction parallel to the inclined wall of P04. The fuel gas enters the roasting furnace P04 from the underside of the P04 cone and has been preheated by the cyclone cooler system to 800°C. The combustion air from °C to 900°C enters the furnace from the cone part. The flow velocity at the air inlet is sufficient to ensure that the particulate material is in a suitable state of suspension in the entire section of the roaster, the air suspends the material, the gas burns, and the aluminum hydroxide The roasting occurs almost at the same instant. The granules are in a turbulent state in the vortex area at the bottom of the furnace, while in other parts they are in a unidirectional flow state, ie a gas transfer bed. The material is at a temperature of 1100°C to 1200°C, only The furnace stays for a second or several seconds and is taken out of the roaster by the high-temperature gas and directly into the cyclone P03 immediately following it. The alumina separates from the hot gas and enters a cyclone cooling system, and the hot gas enters. Cyclone heaters P02, P04 and P03 form the reactor of the complete gas suspension system.

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