Combination crucible cover for aluminum hydroxide roasting

Abstract

The invention discloses a special combination crucible cover for aluminium hydroxide calcination. The special combination crucible cover includes a crucible cover arranged on the upper end of the crucible; the crucible cover includes a lower crucible cover and an upper crucible cover; the lower end surface and upper end surface of the lower crucible cover are respectively equipped with a lower annular seal groove matched with the upper bead of the crucible and an upper annular seal groove matched with the lower end surface of the upper crucible cover; the lower annular seal groove is in relative position to the upper annular seal groove; the lower crucible cover in the region of the lower annular seal groove and the upper annular seal groove is equipped with a plurality of vertical gas pores; the upper crucible cover is an inverted cup body; the upper crucible cover covers on the upper annular seal groove of the lower crucible cover upside-down; and the annular wall of the upper crucible cover is equipped with a plurality of transverse gas pores at intervals. The special combination crucible cover has novel and reasonable structural design, and can effectively reduce loss of fine powder accompanied with volatile vapor in the aluminium hydroxide calcination process, increase the yield of alumina powder product by more than 3%, reduce volatilization of fine powder in calcination process, and improve the yield of alumina powder product.

Description

Technical field: [0001] The invention relates to the field of high-purity alumina powder production, in particular to a special combined crucible cover for aluminum hydroxide roasting. Background technique: [0002] High-purity alumina products are new functional materials with a purity of more than 99.99%. It is one of the cutting-edge materials with the largest output, the highest output value, and the widest application among new materials in the 21st century. It has a series of optical, electrical, magnetic, thermal and mechanical properties that conventional materials do not have, so it is widely used in many fields such as optics, chemical industry and special ceramics. [0003] At present, high-purity alumina powder or block or crystal products made by deep processing of powder are mainly used in: various integrated circuit ceramic substrates in the information industry, tri-color phosphors for energy-saving lamps for green lighting, plasma Display materials (PDP pow...

AI Technical Summary

Problems solved by technology

Taking the aluminum hydroxide roasted by our company as an example, according to the results of differential thermal analysis in the laboratory, for aluminum hydroxide containing part of free water and crystal water, 0.69-0.70 kg of alumina powder should be obtained after roasting per 1 kg, that is, the output rate 67-68%, but in the actual production process, the output rate of the crucible combination we use is only about 60%, a loss of 7-8%, which greatly increases the production cost

[0007] (2) Most of the volatilized fine powder remains in the roasting push plate furnace. On the one hand, it will increase the friction between the push plate and the ceramic rollers at the bottom of the furnace, reducing the service life of the push plate furnace and the push plate. It will partially bury the silicon carbide rods on both sides of the pusher furnace, resulting in local heating and fracture of the silicon carbide rods

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