A fluidized residence conversion device and conversion method for producing α-alumina

Abstract

Te invention belongs to the technical field of metallurgy, and particularly relates to a fluidization type stay reforming device and method for producing alpha-aluminum oxide. The device comprises a cylinder, wherein a top cover is arranged on the top of the cylinder, the lower portion of the cylinder is a cone body, the top cover is communicated with a feed inlet and an exhaust pipe, an inner port of the exhaust pipe is communicated with a valve element of a pressure regulating valve, the inner wall of the lower cone body of the cylinder and an air distributing plate are welded into a whole, a discharge outlet is formed in the middle of the air distributing plate, the discharge outlet is communicated with a feed inlet of a material level valve, an air distributor is installed on the air distributing plate, the upper portion of the air distributor penetrates through the cone body to enter the cylinder, the lower portion of the air distributor is communicated with an air chamber, and the bottom of the air chamber is communicated with an air inlet pipe. When the device works, 1300-1500 DEG C metallurgical aluminum oxide is fed into the cylinder via the top cover through the feed inlet, fluidizing air enters the air chamber through the air inlet pipe, and then alpha-aluminum oxide is discharged through a discharge outlet of the material level valve after crystal transfer is completed. Production processes are simplified, energy is saved by 60-80% compared with a rotary kiln, the fluidization technology is adopted to process powder materials, and product quality is good.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a fluidized residence conversion device and a conversion method for producing α-alumina. Background technique [0002] High temperature alumina, also known as α-alumina, its crystal form is α type. In recent years, with the rapid development of high-tech industries, the application of α-alumina has also been rapidly expanded. Because of its high temperature, high strength, excellent electrical insulation and other properties, it is used as a raw material for ceramic materials such as automobile spark plugs and electronic substrates; it is used for grinding, wear resistance and other characteristics because of its good thermal stability, high hardness, and wear resistance. Raw materials for grinding mechanical parts; it is used as refractory materials and castables due to its high melting point (2053°C) and strong chemical inertness. To sum up, α-alumina is an ino...

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Problems solved by technology

[0004] The raw material is aluminum oxide instead of aluminum hydroxide, the product quality is poor, high energy consumption, many equipment, long process, high maintenance cost, small single production capacity, high construction cost and operation cost

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