中文摘要：

对医疗垃圾焚烧飞灰酸浸,并硫化沉淀移除浸出液中的重金属,考察了操作参数对飞灰中重金属酸浸及其硫化沉淀效果的影响,分析了残灰的物相和重金属含量及其浸出毒性。结果表明：在p H=2、酸浸时间=30 min、液固比=20/1时,重金属的酸浸率最高,Zn、Pb和Cu等3种重金属的酸浸率分别达91.29%、79.18%和85.57%;对浸出液进行硫化沉淀发现,Na2S的摩尔比=1.4、硫化时间=30 min、p H=2时硫化效果最好,Zn、Pb和Cu硫化率分别达到85.47%、72.78%和77.56%,重金属硫化沉淀可考虑后续采用浮选法分离回收,酸浸后的残灰物相为Ca SO4、Si O2及复杂稳定的硅酸盐,残灰可送入生活垃圾填埋场进行填埋处置。

英文摘要：

The acid leaching and sulfidation treatment of heavy metals generated in hospital waste incinerator （HWI） fly ash was investigated. Effect of factors such as the liquid to solid （L：S） ratio, pH value and dosage of Na2S on the acid leaching and sulfide precipitation of heavy metals from HWI fly ash were examined. Characterization of remnants fly ash after acid leaching was analyzed. Results show that 91.29% of Zn, 79.18% of Pb and 85.57% of Cu were acid leached at pH 2, leaching time 30 min and liquid to solid ratio of 20/1. The most suitable condition of sulfidation is Na2S molar ratio of about 1.4, sulfidation time 30 min and pH 2, obtaining 85.47%, 72.78% and 77.56% for Zn, Pb and Cu respectively. Heavy metals after sulfide precipitation can be considered to separate and recovery by flotation. The remnants fly ash can be fed directly into the solid waste landfill for landfill disposal.