This invention provides a kind of purificn. method for removing muddiness, eliminating "carbohydrate gun" and decolouring of kelp soaking slon., including coagulation, sterilization and fungistasis, filtration and decoloration. The kelp soaking aqueous soln. prepared by the said method possesses the advantages as foloow: obtaining a clear and transparent water quality with pollution index FI is less than 4, prolongind the scrubbing period of electric dialyzator by 5 times over, raising the yield rate of mannite by 30%, and saving the energy consumption and prodn. expenses by 1/3 over. This purificn. method is also applicable to other similar chemical sepn. processes. |