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  • Title: Use of sulfoaluminate cement and bottom ash in the solidification/stabilization of galvanic sludge.
    Author: Luz CA, Rocha JC, Cheriaf M, Pera J.
    Journal: J Hazard Mater; 2006 Aug 25; 136(3):837-45. PubMed ID: 16488079.
    Abstract:
    Solidification/stabilization (S/S) process can improve the physical characteristics of wastes, reduce their leaching and limit the solubility of their heavy metals. The identification of binders able to assume the fixation of contaminants is essential for the success of the technique. In this study, calcium sulfoaluminate cement was added to another waste, bottom ash, in order to treat galvanic sludge. The properties of the resultant solid matrix (MS) were determined: setting time, compressive strength and products of hydration. Solid matrix composed of 77% waste and only 23% cement presented initial setting time lower than 4 h and 28 day-strength of 6 MPa. SEM investigations showed that contaminants present in the galvanic sludge (Cr) were encapsulated in the hydrated phases and particles of bottom ash.
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