关键词: 氰化废水, 乳状液膜, 三正辛胺, 萃取率

Abstract: The cyanide wastewater was treated by emulsion liquid membrane method using three octyl amine（TOA） as carrier，kerosene as membrane solvent，liquid paraffin as membrane additives，and NaOH solution as aqueous phase. Cyanide extraction rate was influenced by surfactant dosage，mobile carrier dosage，and concentration of NaOH in the liquid phase. The experimental results showed that the extract rate of cyanide can reach above 95% in the following condition：2% of TOA volume fraction，3% of surfactant Span-80 volume fraction，1% of liquid paraffin volume fraction，2% of mass concentration of NaOH in the internal phase is，1∶1 of volume ratio of oil to internal phase is，1∶7 of volume ratio of emulsion liquid to wastewater，and 15 min of extraction time. Under the optimum condition，the different initial concentrations of cyanide wastewater of 322.23 mg/L，483.35 mg/L，644.46 mg/L and 966.70 mg/L were studied in order to obtain the optimal range of the initial concentrations. The results showed that the extract rate of cyanide can reach above 95% when the rang of initial concentration of cyanide wastewater was 300—500 mg/L.

Key words: cyanide wastewater, emulsion liquid membrane, three octyl amine, extraction rate