Fly ash is the fine ash in pipe gas delivered by coal burning. It includes a smooth surface and fine microspore, essentially made out of silica, aluminum oxide, iron oxide, calcium oxide, magnesium oxide, sulphur trioxide, and different parts. https://bit.ly/3R4H9C9 https://bit.ly/3Q67b6L https://bit.ly/3CMYDyW https://bit.ly/3cyLMp8 https://bit.ly/3AFMicU https://bit.ly/3QahKFY https://bit.ly/3cyLVca