ZHAO Angran, REN Qiangqiang

(1.Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China; 2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract: In order to realize “waste control with waste”, silica fume and municipal solid waste incineration fly ash were prepared into mixed ash according to a certain mass ratio, and the effects of silica fume mass fraction and thermal treatment temperature on the melting characteristics of mixed ash were investigated. The product after thermal treatment of mixed ash was characterized by X-ray diffractometer, scanning electron microscope and energy dispersive spectrometer. The mass fraction of heavy metals and leaching concentration of chlorine in the mixed ash after thermal treatment were determined by inductively coupled plasma mass spectrometer. The results show that when the mass fraction of silica fume is 20%～30% and the thermal treatment temperature is 1 300 ℃, the quaternary basicity is about 1 (neutral), the mass loss rate and volume reduction rate of mixed ash reach the maximum, the product of mixed ash after thermal treatment is homogenous amorphous glass, and the leaching toxicity of heavy metals and chlorine elements in the glassy product of mixed ash after thermal treatment basically disappears.

Keywords: silica fume; municipal solid waste incineration fly ash; mixed ash；melting characteristics; leaching toxicity

中图分类号：X705

文献标志码：A

文章编号：1008-5548(2021)04-0016-11

DOI:10.13732/j.issn.1008-5548.2021.04.003

收稿日期： 2021-01-28， 修回日期：2021-05-14，在线出版时间：2021-06-03 14:07。

基金项目：国家自然科学基金项目，编号：U1810127；中国科学院青年创新促进会项目，编号：Y201932。

第一作者简介：赵昂然(1996—)，男，硕士研究生，研究方向为固体废弃物资源化利用。E-mail：zar1996@qq.com。

通信作者简介：任强强(1983—)，男，博士，副研究员，硕士生导师，研究方向为煤的高效清洁利用。E-mail：renqiangqiang@iet.cn。