钠基干法脱硫灰协同飞灰脱钙工艺路径研究OA

In the field of solid and hazardous waste,both industrial solid waste sodium-based dry desulfurization ash and hazardous waste municipal solid waste incineration fly ash face disposal challenges.This study focuses on the synergistic decalcification and hardness reduction of fly ash using sodium-based dry desulfurization ash from tunnel kiln flue gas.The decalcification effects of two process pathways,using desulfurization ash as fly ash washing slurry and fly ash washing filtrate,were investigated.The removal efficiency and action pathways of Ca2+from fly ash were systematically investigated using different sodium salts in desulfurization ash.Characterization methods such as X-ray diffraction(XRD),X-ray fluorescence spectrometry(XRF),and ion chromatography revealed the composition of soluble salts and insoluble matter in desulfurization ash,as well as the mechanisms by which Na2 SO4,Na2 CO3,and NaF react with Ca2+.The experiments showed that the calcium removal efficiency of direct mixing of desulfurization ash with fly ash was 50%to 78%,and the calcium removal efficiency for fly ash filtrate was 60%to 99%,with hardness reduced from 15845 mg/L to an average of 2500 mg/L.Under optimized process conditions,hardness could be reduced to below 150 mg/L.This study integrates the recycling of different industrial solid and hazardous wastes,providing a new technical path for the resource utilization of sodium-based dry desulfurization ash and is of significant importance for alleviating the disposal pressure of fly ash.