Patent ID: 8784754
Filing Date: 2014-07-22
Classification: B01D,C01F,C01P

Abstract:
1. A method for high-purity alumina, the method comprising: a mother liquor preparing step of preparing a mother liquor by dissolving and aging aluminum hydroxide; a refining step of adding pulp to absorb impurities from the prepared mother liquor, after the mother liquor preparing step to form refined mother liquor; and an obtaining step of obtaining high-purity alumina, after the refining step, wherein the obtaining step is a step of obtaining the high-purity alumina by adding a seed to the refined mother liquor to form a precipitate, filtering, washing and dissolving the precipitate, recrystallizing the dissolved precipitate by neutralizing the dissolved precipitate, again filtering and washing the recrystallized precipitate, mixing a small amount of aluminum fluoride (AlF