Method for preparing high-pruity alumina powder

TLDR: In this paper, a method to produce highly pure Alumina powder is described. The steps are as follows: deploying Aluminium hydroxide which is produced in the process of manufacturing alumina using sintering process to be solution, disposing of impurity, adding seed crystal to prepare highly pure aluminium hydroxides; removing Na in the solution, getting highly pure bodhmite after hydrothermal synthesis; and after washing and baking, highly pure Albina can be obtained.

Abstract: The invention discloses a method to produce highly pure Alumina powder. The steps are as follows: deploying Aluminium hydroxide which is produced in the process of manufacturing alumina using sintering process to be solution, disposing of impurity, adding seed crystal to prepare highly pure aluminium hydroxide; removing Na in the solution, getting highly pure bodhmite after hydrothermal synthesis; and after washing and baking, highly pure Alumina can be obtained. The cost is about 15 thousand per ton, which is far less than current market price, 40-60 thousand per ton. It can put into production in a large scale and it is easy to reach 1-5 thousand ton per year. With a low cost, no pollution and high purity (over 99.99 percent), the production is widely used in rare earth fluorescence materials, high voltage Na lamp and other relative special Alumina fine ceramics field.