Current Research Situation of Al Extraction from Fly Ash
Enhancing the activity of Al from fly ash is the key to improve Al-extraction efficiency of fly ash by analyzing chemical composition and physical properties of fly ash.On how to improve leaching activity of Al,the paper mainly discuss the current Al-extraction of fly ash,including the processes of calcium salt,sodium salt alkali sinter and acid leaching.The advantages and disadvantages of each technical process are also discussed.Finally,the developing direction of fly ash Al extraction technology is high efficiency,economize on energy,low consume,decrement(waste residues,waste gas),no secondary pollution.