Abstract:An
original technology named HNO3 pressure
leaching
has been proposed by our team to leach Al from coal gangue and fly
ash. Although the preliminary separation of Al and Fe had been achieved
during leaching, a small amount of Fe impurity was still unavoidably
dissolved into the leach liquor. To obtain pure Al2O3 during subsequent pyrolysis, it is imperative to synchronously
remove Fe3+ during the crystallization of Al(NO3)3·9H2O. Herein, the phase equilibria
of the Al(NO3)3–Fe(NO3)3–H2O(−HNO3) system at
25–40 … Show more
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