PROCESS FOR THE REMOVAL OF ORGANIC COMPOUNDS FROM ALUM EARTH PRODUCTION CYCLE

摘要

The invention relates to a new process for the removal of organic compounds from alum earth production cycle performed according to the Bayer process. According to the invention the proceeds as follows: a) the liqour to be recirculated, obtained after precipitation, is optionally concentrated and heated to 120-350.degree.C, oxygen of an oxygen-containing gas is introduced into the liquor until a partial oxygen pressure of 3 to 30 atmospheres is attained, oxygen is finely dispersed in the liquor, and, if necessary, oxygen is supplemented according to the consumption, thereafter pressure is decreased to atmospheric, and the solid decomposition products of the organic impurities are separated from the liquor; or b) a part of the liquor to be introduced into the digestion step is heated to 120-350.degree.C, oxygen or an oxygencontaining gas is introduced into the liquor until a partial oxygen of 3 to 30 atmospheres is attained, oxygen is finally dispersed in the liquor, and, if necessary, the consumed amount of oxygen is supplemented, thereafter the liquor, pre-treated as described above, is combined in the digesting apparatus with the circulating slurry to be digested, and the solid decomposition products of the organic impurities are removed from the aluminate liquor together with red mud. The invention provides an easy, economical and efficient method for removing the distributing organic impurities.