Preparation method of super-purity aluminum oxide

Abstract

The invention discloses a preparation method of a super-purity aluminum oxide, characterized by comprising the specific process steps as follows: (1) dissolving an industrial aluminum sulfate, stirring and heating to 60-95 DEG C, cooling concentrated solution, filtering, crystallizing and drying, removing impurity from filtrate, and recycling; (2) dissolving industrial senior ammonium sulfate in deionized water, and filtering to obtain clarified filtrate; (3) dissolving the dried crystallized aluminum sulfate solution, adding the ammonium sulfate while stirring continuously, then adding ammonium tartrate, heating the solution, filtering when the solution is hot and the crystal is to be separated out, concentrating the filtrate, cooling and crystallizing, recrystallizing for twice, and recycling the mother solution for reuse; (4) adding the deionized water to dissolve the recrystallized aluminum ammonium sulfate, filtering, adding hydrochloric acid until aluminum trichloride is completely separated out; crystallizing and drying, using the hydrochloric acid to wash the surface of the crystal; and (5) placing the high-purity AlCl3 in a muffle furnace to burn for 3-6 hours at 550-800 DEG C, crushing, grinding, and sieving to obtain the high-purity aluminum oxide powder.

Description

Technical field [0001] The invention relates to the technical field of inorganic material alumina powder preparation, and is a preparation method of ultra-pure alumina. It relates to a reaction between an aluminum ammonium sulfate solution prepared by adding purified industrial aluminum sulfate to organic substances such as ammonium sulfate and tartaric acid and hydrochloric acid , Obtain high purity alumina. The method has simple production process, and the obtained alumina has high purity, which can reach 99.9999% spectral purity. Background technique [0002] Alumina is an inorganic non-metallic material with a wide range of uses. Ordinary alumina is obtained from the bauxite smelting process, and its purity is low, and it cannot meet the process requirements in many applications. Ultra-pure alumina has the advantages of high purity, fine particle size, uniform particle size distribution, etc., showing superior optical, electrical, magnetic, thermal and mechanical properties...

AI Technical Summary

Problems solved by technology

All of these methods have problems such as complex process flow, complex and harsh operating conditions, many types of raw materials involved, large differences in main content, vastly different impurity components, high energy consumption for solution heating, and the need to purchase special equipment, which leads to large investment in production equipment and high product costs. , it is difficult to promote and use in the current industrial production at home and abroad