High purity alumina powder preparing device and method

Abstract

The invention particularly relates to a high purity alumina powder preparing device and a high purity alumina powder preparing method. The device comprises a reaction kettle, a stirrer, aluminium plates, a water cooled jacket and a micro-arc oxidation power source, wherein the stirrer is arranged inside the reaction kettle; the water cooled jacket is arranged outside the reaction kettle; a liner of the reaction kettle is connected with a negative electrode of the micro-arc oxidation power source; and the aluminium plates are hung inside the reaction kettle by aluminium wires, and are connected with a positive electrode of the micro-arc oxidation power source. According to the method, a micro-arc oxidation technology is adopted in a pure water system, aluminium hydroxide is produced, and hydrogen is released; water flow which is produced by a stirring technology is matched, and the produced aluminium hydroxide gel is rapidly separated from the surface of metallic aluminium, so that the metallic aluminium can continuously react with water; the technology is concise; the reaction speed is rapid; the efficiency is high; no pollution is caused; the surface shape of the metallic aluminium cannot form limitation; the phenomena that the metallic aluminium and hydrolyzate mutually wrap and agglomerate in the reaction process can be effectively reduced; a hydrolysis reaction can be thorough; and the productive rate is high.

Description

Technical field [0001] The present invention is a field of alumina preparation technology, and especially involves a device and method for preparing high -pure aluminum oxide powder. Background technique [0002] High -pure aluminum powder (≥99.99%), as one of the important raw materials of the ceramic industry, has always played a very important role.And with the continuous development of new materials, it has become an important functional material that supports the development of high -tech. At present, infrared receiving window materials, integrated circuit porcelain pieces, information display materials and devices of the information industry, information industry, information industry, and information industry are widely used.Exquisite chemical special high -end ceramic devices, laser technology, artificial red, sapphire, and catalyst carriers.And its excellent performance in light, electricity, magnetic, thermal, and mechanical properties has prompted it to further expand ...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN101829607A and Chinese patent CN104047015A respectively introduced ultrasonic-electric field coupling to activate hydrolysis of metal aluminum to prepare catalyst carrier Al 2 o 3 A powder preparation method, and a method for preparing high-purity alumina powder by alternating current electrolysis, these two preparation methods are simple in principle, short in process flow, high in product purity, and non-polluting, but the preparation method of ultrasonic-electric field coupling activation of hydrolyzed aluminum Need to use precious metal electrode materials such as metal platinum electrode, palladium silver electrode, etc., and a set of special oxygen electrode and reactor integration equipment is required, the production investment is huge, and the process is complicated, and the process parameters are very fine, which leads to difficulties in the process control of the production process

The method of preparing high-purity alumina by AC electrolysis needs to prepare alkaline water in advance, which increases the complexity of the production process, and AC electrolysis equipment also has problems of high investment and high energy consumption, which in turn leads to high production costs.

Chinese patent CN103803619A introduces a method for producing high-purity alumina powder with fine metal aluminum powder. High-temperature aluminum liquid is used as a heat source to heat the mixture of high-purity fine metal aluminum powder and high-purity oxygen to generate high-purity alumina powder. The process of the method is simple, but the accumulation of aluminum powder in the sintering chamber is difficult to completely react with oxygen, and the reaction is violent and easy to explode, which poses a huge safety hazard

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