Synthesis of ammonium aluminum oxalate from Bayer aluminum hydroxide

摘要

The synthesis of ammonium aluminum oxalate was performed using Bayer aluminum hydroxide as a raw material. For this aim, Bayer aluminum hydroxide of 99.7% purity was dissolved in oxalic acid to produce an aqueous aluminum solution. As a result, it was found that a mixing ratio of ethanol to Al solution exceeding 2:1 and a pH adjusted to greater than 8.0 should be employed in the synthesis of ammonium aluminum oxalate. From the chemical analysis of ammonium aluminum oxalate prepared in this work, the NH_4, Al and C content were found to be 14.5, 7.18 and 17.4%, respectively which are very close to the theoretical values of (NH_4)3A1(C_2O_4)_33H_2O.