Abu terbang adalah sisa mineral yang paling banyak ditinggalkan daripada pembakaran arang batu oleh loji janakuasa arang batu. Abu terbang pozzolanic, yang bermaksud bahawa ia mempunyai sifat-sifat simen. It is valuable for

Companhia Vale do Reio Doce (CVRD) is one of the largest mining companies in the world. Headquartered in Brazil, they have mining operations in 30 countries around the world. They