The invention discloses a sub-step flotation and
detoxification method for
incineration fly ash of medical garbage. The sub-step flotation and
detoxification method is characterized in that coseparation of dioxin and a carbon component is realized by first-step flotation, so that the
toxicity of organic pollutants including the dioxin and the like in the
fly ash is reduced; meanwhile, soluble heavy
metal is eluted; second-step flotation of
tail slurry is subjected to a
sulfide precipitation flotation method and heavy
metal including Pb, Zn and the like is removed and recycled, so that the harms of the heavy
metal are eliminated. Separated final products mainly comprise enriched carbon, residual ash, heavy metal
sediment salt and the like, wherein the enriched carbon rich in the dioxin is conveyed into a garbage incinerator secondary
incineration chamber to be incinerated, so that the high-temperature
decomposition of the dioxin is realized by a low cost; the volume and the
toxicity of the residual ash are greatly reduced and the residual ash is directly conveyed into a
municipal solid waste landfill to be safely treated or reutilized, so that the subsequent treatment cost is greatly reduced; the heavy metal in the
fly ash is leached with an acid and vulcanized and then is precipitated, floated and recycled, so that a plurality of purposes are realized. The method can realize harmless treatment and
resource utilization of the
incineration fly ash of the medical garbage under environment-friendly and low-cost conditions.