| 摘要 |
The invention relates to a method for producing a stable aluminium hydroxide gel on the basis of the sodium aluminate lye which is obtained during the production of Al2O3 according to the BAYER method. The caustic mol ratio (Na2Ofree/Al2O3) of the lye containing aluminate is adjusted to smaller than 1.6. The lye is treated with carboxylic acid anhydride, whereby the aluminium hydroxide gel is precipitated at a temperature of below approximately 40° C., whereby the pH value ranges from 8 to 12. The precipitation product and the lye are separated from one another. The precipitation product is washed and dried, whereby the amorphous structure is obtained.
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