2006•Hydrometallurgy of ChinaRequires access

Thermodynamic Properties of Depositing Alumina Hydrate From Sodium Aluminate Solutions

Xiaobin Li

Abstract

In order to further investigate precipitation mechanism of alumina hydrate from sodium aluminate solutions,thermodynamic properties of the process was analyzed.The analyzed results for Al_2O_3-H_2O system show that transformation trend of gibbsite to boehmite is stronger than that of gibbsite to diaspore at standard conditions in the range of 25 ℃ to 150 ℃,the stable phase of this area is boehmite.The calculated results of seeded precipitation from sodium aluminate solutions indicate that pure boehmite and diaspore can be obtained by seeded precipitation using boehmite and diaspore as seed respectively in the range of 90℃ to 150℃.

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Key concepts: Gibbsite, Boehmite, Sodium aluminate, Diaspore (botany), Aluminate, Hydrate, Precipitation, Bauxite