Solification/Stabilization of arsenic in different cement matrices
Keywords: 
Immobilization
Solidification
Stabilization
Waste
Ordinary Portland Cement
High Alumina Cement
Low Alumina Cement
Arsenic
Issue Date: 
23-Mar-2018
Publisher: 
Universidad de Navarra
Citation: 
González-Sánchez JF, Fernández JM, Alvarez JI, Navarro-Blasco I "Solification/Stabilization of arsenic in different cement matrices". EN: XI Jornada de Investigación en Ciencias Experimentales y de la Salud en la Universidad de Navarra. Libro de Resúmenes 2018;comunicación poster# 55:76.
Abstract
To immobilize heavy metals and metalloids contained in some wastes, solidification / stabilization (S / S) process has been tested and used to reduce the leaching of contaminants before their disposal in the landfill. Cement is the most adaptable binder currently available for this immobilization. A growing number of works have dealt with this issue, mainly using ordinary Portland cement (OPC), some of its phases or OPC modified aluminum aluminate, calcium sulfate and / or additives. In this study we will immobilize two different arsenic salts (sodium arsenate heptahydrate (Na2HAsO4,7H2O) and Sodium arsenite (NaAsO2)), include in three different cement matrices: ordinary Portland cement (OPC), high alumina cement (HAC) and low alumina cement rich in iron oxide content (LAC). Currently it has been reported that CACs show potential advantages when used to encapsulate certain toxic and radioactive wastes, due to their high initial mechanical resistance, avoiding the chemical attack and preventing the abrasion. In previous research the capacity of the CAC inclusion for toxic metals was excellent, in this way, these mortars perfectly encapsulate the toxic metals, which makes the use of HAC and LAC suitable for waste management, as has been demonstrated in the leaching tests. The aim of this work is finding the best conditions to encapsulate the As trough different tests as the leaching test and isothermal calorimetry.

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