A new technology for treating waste incineration fly ash by shaft furnace
Cui Wang1, Long‑zhi Chen2, Zheng‑jian Liu2, Yang Li2, Yao‑zu Wang2, Ke‑xin Jiao2
1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
A new technology for treating waste incineration fly ash by shaft furnace
Cui Wang1, Long‑zhi Chen2, Zheng‑jian Liu2, Yang Li2, Yao‑zu Wang2, Ke‑xin Jiao2
1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
摘要 At present, lots of municipal solid wastes (MSWs) are treated by incineration technology, which produces a large amount of fly ash that needs to be treated innocuously. A new method of using metallurgical shaft furnace to treat the MSW fly ash was thus proposed, and some research was done for this method. Firstly, the basic physical properties of MSW fly ash were analyzed, and then, the briquetting experiment and melting treatment of MSW fly ash were explored. In the process of briquet? ting, the influence of different factors (water content, cement content, forming pressure and curing time) on the compressive strength of the briquettes was studied. The results showed that with the increase in water content, cement content, forming pressure and curing time, the compressive strength of the briquettes increased correspondingly. However, the compressive strength of the briquettes showed a downward trend when these values exceeded a specific range. In the melting experiment, it was found that some heavy metals (such as Cr, Be and Ba) could be solidified in the slag when the fly ash was treated at 1450 °C for 50 min, and the leaching toxicity of heavy metals was lower than the landfill standard of waste in China. At the same time, the decomposition rate of dioxins in fly ash reached 99.66% after melting treatment.
Abstract:At present, lots of municipal solid wastes (MSWs) are treated by incineration technology, which produces a large amount of fly ash that needs to be treated innocuously. A new method of using metallurgical shaft furnace to treat the MSW fly ash was thus proposed, and some research was done for this method. Firstly, the basic physical properties of MSW fly ash were analyzed, and then, the briquetting experiment and melting treatment of MSW fly ash were explored. In the process of briquet? ting, the influence of different factors (water content, cement content, forming pressure and curing time) on the compressive strength of the briquettes was studied. The results showed that with the increase in water content, cement content, forming pressure and curing time, the compressive strength of the briquettes increased correspondingly. However, the compressive strength of the briquettes showed a downward trend when these values exceeded a specific range. In the melting experiment, it was found that some heavy metals (such as Cr, Be and Ba) could be solidified in the slag when the fly ash was treated at 1450 °C for 50 min, and the leaching toxicity of heavy metals was lower than the landfill standard of waste in China. At the same time, the decomposition rate of dioxins in fly ash reached 99.66% after melting treatment.
Cui Wang,Long‑zhi Chen,Zheng‑jian Liu, et al. A new technology for treating waste incineration fly ash by shaft furnace[J]. Journal of Iron and Steel Research International, 2021, 28(7): 773-784.