The Recovery of Ca and Zn from the Municipal Solid Waste Incinerator Fly Ash

Sustainability

Chen-Piao Yen¹  Song-Yan Zhou¹  Yun-Hwei Shen¹ 

[1] Department of Resources Engineering, National Cheng Kung University, Tainan 70101, Taiwan;

关键词: fly ash;    washing;    leaching;    ion exchange;    calcium;    zinc;   

DOI  :  10.3390/su12219086

来源: DOAJ

【 摘 要 】

The treatment and disposal of municipal solid waste incineration (MSWI) fly ash containing significant amounts of dissolvable salts and heavy metals is a seriously challenge. At present, the common treatment method for MSWI fly ash in Taiwan is the cement-based stabilization/solidification (S/S) process. In this work, an integrated hydrometallurgical process for the treatment of MSWI fly ash was evaluated. Ca was first recovered by combining water washing and ion exchange sequentially. Meanwhile, Zn in the water-washed fly ash was recovered by combining acid leaching and ion exchange sequentially. Combining the water washing efficiency of 30% on raw ash and the acid leaching efficiency of 40% on pre-washed ash, a total of 58% mass reduction rate of fly ash was achieved. In addition, an 80% Zn and 58% Ca recovery was achieved.

【 授权许可】

Unknown