摘要
通过实验研究了生活垃圾焚烧飞灰的酸洗浮选特性,着重分析了酸洗和浮选后飞灰中重金属的浸出毒性,并讨论了浮选剂对颗粒浮选比例的影响。结果表明,捕收剂乙硫氮和硫化剂Na2S的加入可以从整体上促进飞灰的浮选,如只添加松醇油时48-75μm飞灰的浮选比例为33.7%,当加入适量乙硫氮和Na2S时其可提高到39.2%。此外,浮选处理后上、下层灰样质量比为1：3,浮选过程中上层灰样以粒径较小的颗粒为主,而下层灰样以粗颗粒集合体为主。各工况所得浮选上层灰样重金属浓度都高于下层灰,且酸洗20 min后下层灰样中重金属浸出值低于GB 16889-2008《生活垃圾填埋场污染控制标准》限定值,因而可作为普通垃圾直接送入生活垃圾填埋场进行填埋处置,而浮选上层灰样需经过60 min酸洗处理后才可达到此标准。
Experimental study was established to investigate the application of combination process of acid washing with flotation during fly ash disposal. The leaching character of heavy metal after disposal was analyzed. The results indicated that the fine particle size fly ash distributed mainly in the upper layer during flotation while coarse particle in the bottom,which due to the poor surface wettability of fine particle. Besides,compared with the bottom ash,the upper ash during flotation had a higher heavy metal concentration and after 20 minutes＇ acid washing the bottom ash met the standard for pollution control on the landfill site of municipal solid waste（ GB16889-2008）,which meant it could be dumped into the landfill site directly,while it took 60 minutes＇ acid washing for upper ash to meet the standard.
出处
《能源工程》
2016年第5期39-43,73,共6页
Energy Engineering
关键词
浮选
酸洗
重金属
浸出
flotation
acid washing
heavy metal
leaching
