Evaluation Of Binary Surfactants On The Flotation Performance Of Incinerator Fly Ash

Carbon constituents and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in incinerator fly ash can be removed by floatation, but the floatation performance is poor due to weathering. The effects of four binary surfactants (i.e., SDS-Tween 80, CTAB-Tween 80, Span 20-Tween 80 and SDS- CTAB) on the flotation process were discussed. Results show that SDS-Tween 80 with the mixture ratio of 3:7 is superior to the other surfactant mixtures in decarburization and PCDD/Fs removal, and can remove 91.4% of carbon constituents and 89.3% of PCDD/Fs. The content of PCDD/Fs in the tailings is 2.6 ng I-TEQ/g which meets the landfill standard of PCDD/Fs.