FIELD: cleaning of sewage water from fluorine. SUBSTANCE: method involves introducing into sewage water to be purified of adsorbent - preliminarily neutralized white sludge obtained in the process of removal of silicon from aluminate solutions by means of retort in alumina production; mixing and separating liquid and solid phases (for example by filtering or settling). Adsorbent is introduced in weight ratio of (10-12):1 with respect to the amount of sodium fluoride contained in sewage water. EFFECT: improved quality of cleaning and simplified method of cleaning. 2 cl
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