关键词: 煤粉炉粉煤灰, 氧化铝, 粉磨法, 硫酸法

Abstract:

The pretreatment and activation technology of preparing alumina in recent years using pulverized-coal fly ash as raw material was introduced.The advantages and disadvantages of the grinding method,sulfuric acid method,calcium chloride method,ammonium salt method,carbonate method,fluoride salt method and physical-chemical combined activation method were pointed out,and the link in the engineering conversion process that needs to be focused on was also confirmed.Although part of the process technology has been industrialized,due to high costs and other factors,the project has been closed.It was recommended that the research direction of comprehensive utilization of fly ash should be oriented to the difficult problems of engineering conversion.The combination of theoretical research and engineering design will gradually explore a good economic benefit,safe and environmentally-friendly industrial route for the production of alumina from fly ash.

Key words: pulverized-coal fly ash, alumina, grinding method, sulfuric acid method