关键词: 粉煤灰, 氧化硅, 氧化铝, 赤泥

Abstract: Fly ash is currently one of the largest emissions of solid waste in the world.Researches showed that the fly ash in some regions of China has high utilization value.Research and application of extracting silicon and aluminum from fly ash were increasing in recent years.Four major oxide-extracting methods from fly ash,including red mud method,sintering method,acid method,and alkali method,were introduced and sintering,acid,and alkali methods were introduced in detail and typical process routes were given at the same time.Latest research progress of extracting oxide from fly ash in China was summarized.Advantages and disadvantages of those methods were summed up and the China′s future development of extracting monox and alumina from fly ash was prospected.Research and development on extracting silicon and aluminum from fly ash has good social benefit and economic value. 

Key words: fly ash, monox, alumina, red mud