Stabilization/Solidification of Toxic Elements in Cement Pastes Containing a Spent FCC Catalyst

摘要: Huge amounts of spent fluid catalytic cracking (FCC) catalysts, also called Ecat, are produced worldwide, every year. Alternatives to the traditional landfill disposal imperative reduce environmental contamination and production hazardous solid wastes. The leaching iron, nickel, antimony, vanadium from Ecat was investigated using toxicity characteristic procedure (TCLP) assess risk aquatic environment. concentrations these elements in leachate a cement paste containing 15% were much reduced as compared those leached sample below limits established water quality criteria United States Environmental Protection Agency (USEPA 2004). solidification/stabilization (S/S) Fe, Ni, V, Sb influenced by chemical properties stability products formed with cement-hydrated phases erosion exposed environments. S/S mechanisms less effective seawater this related reactions salts usually present seawater. results indicated that process efficient enough prevent excessive toxic elements.