energies Review Technological Solutions for Recycling Ash Slag from the Cao Ngan Coal Power Plant in Vietnam Thriveni Thenepalli 1 ID , Nguyen Thi Minh Ngoc 2, Lai Quang Tuan 2, Trinh Hai Son 2, Ho Huu Hieu 2, Dang Tran Nhu Thuy 2, Nguyen Thi Thanh Thao 2, Duong Thi Thanh Tam 2...