Solidification and stabilization of Pb, Zn, Cd and Cu in tailing wastes using cement and fly ash

Three types of acidic solution (0.1 N HCl, HNO3-HClO4 and HNO3-HCl) were ap plied to determine the elemental compositions for tailing wastes and fly as h. In addition, a sequential extraction was carried out to determine the ch emical partitioning. The curing period of the solidified/stabilized (S/S) m aterials was estimated for its unconfined compressive strength (UCS) at thr ee, seven and 28 days in order to learn the mixing ratio of cement, railing wastes and fly ash, respectively. To obtain the highest strength, the opti mum mixing ratio was considered to be 85% cement, 5% tailing wastes and 10% fly ash (TW5FA10). (C) 2000 Elsevier Science Ltd. All rights reserved.