Preparing a high purity alumina by methods other sodium

The present invention discloses a method for preparing a high purity alumina by addition of sodium, including purification, secondary purification, washing, drying, secondary washing, drying step, including a higher amount of sodium aluminum hydroxide ground to ≤500μm, washed 3 times with 2 ~ sodium removal agent ⅰ at 50 ~ 55 ℃ water bath with stirring to afford pure aluminum hydroxide; aluminum hydroxide purified water purified to PH7.0 ~ 7.5, dewatering and drying; the washed, dried aluminum hydroxide was added after the addition of sodium ⅱ agent at 30 ~ 50 ℃ the water bath was stirred and washed 2 to 3 times; the secondary aluminum hydroxide was washed with purified water 30 ~ 50 ℃, washed End after drying dehydration ultra-low transition fluffy sodium aluminum hydroxide. The present invention is simple and convenient, clean, in addition to sodium and good effect.