FIELD: processing of soda-sulfate-fluoride solutions formed at scrubbing gases of electrolysis housings.
SUBSTANCE: method comprises steps of exhaust gas scrubbing of electrolysis process by means of salt solution; separating from solution after gas scrubbing secondary cryolite; lime causticization of cryolite mother liquor; metering lime for causticization in quantity 100 - 110% of active CaO of stoichiometric quantity necessary for reaction with soda and sodium fluoride; separating mixed deposit of calcite CaCO2 and fluorite CaF2 from solution; evaporating prepared sulfate-caustic solution till content of caustic alkali Na2O in range 150 - 200 g/l at depositing anhydrous sodium sulfate.
EFFECT: elimination of discharging fluoride solution to slime storage, possibility for producing sodium sulfate as commercial product.
1 dwg, 1 ex
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