State Key Laboratory for Advanced Iron and Steel Processes and Products, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, PR China.
State Key Laboratory for Advanced Iron and Steel Processes and Products, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, PR China.
Waste Manag. 2024 Jun 30;183:191-198. doi: 10.1016/j.wasman.2024.05.016. Epub 2024 May 17.
With the development of municipal solid waste incineration technologies, the disposal of fly ash has become a difficult problem that many countries need to solve. High-temperature melting is a promising disposal technology. Based on this, a new process for collaborative treatment of fly ash in metallurgical blast furnaces had been proposed in this study. To explore the impact of disposal of fly ash on blast furnace production, by simulating the high-temperature reducing environment of blast furnaces, the melting changes of water-washed fly ash (W-FA), and the effects of W-FA injection on coal combustion and products (slag, iron) composition were studied. The results showed that W-FA, as a flux, could be sprayed into the blast furnace separately or mixed with coal. But when injected along with coal, W-FA would suppress the combustion of coal. After melting, the removal rates of S, P, Cl, and Pb in W-FA were 21%, 30%, 86%, and 89%, respectively. The removal rates of K, Na, and Zn were close to 100%, and Cr was basically not removed. When the proportion of W-FA to coal was less than 1%, in addition to controlling the alkalinity of the slag, the impact of W-FA on the composition of iron and slag was minimal. The successful execution of this work will not only achieve the reduction, harmless and resourceful utilization of fly ash, but also save investment and operating costs of disposal facilities, with both environmental and social benefits.
随着城市生活垃圾焚烧技术的发展，飞灰的处置已成为许多国家需要解决的难题。高温熔融是一种很有前途的处置技术。在此基础上，本研究提出了一种在冶金高炉中协同处理飞灰的新工艺。为了探讨飞灰处置对高炉生产的影响，通过模拟高炉的高温还原环境，研究了水洗飞灰（W-FA）的熔融变化，以及 W-FA 喷射对煤燃烧和产物（渣、铁）成分的影响。结果表明，W-FA 作为助熔剂可单独喷入高炉，也可与煤混合喷入。但与煤一起喷入时，W-FA 会抑制煤的燃烧。熔融后，W-FA 中 S、P、Cl 和 Pb 的去除率分别为 21%、30%、86%和 89%，K、Na 和 Zn 的去除率接近 100%，Cr 基本不被去除。当 W-FA 与煤的比例小于 1%时，除了控制渣的碱度外，W-FA 对铁和渣成分的影响很小。这项工作的成功实施不仅可以实现飞灰的减量化、无害化和资源化利用，还可以节省处置设施的投资和运行成本，具有环境和社会效益。
