| Patent Number: 7452163 | | Title: Method of treatment, stabilization and heave control for chromite ore processing residues (COPR) and chromium contaminated soils | | Inventors: Wazne; Mahmoud (New York, NY), Dermatas; Dimitris (Hoboken, NJ), Kalyon; Dilhan M. (Teaneck, NJ), Meng; Xiaoguang (Highland Park, NJ), Kaouris; Maria (Basking Ridge, NJ), Morris; John J. (Oakland, NJ) | | Abstract: A process for stabilizing chromium in a chromite ore processing residue (COPR) comprises the steps of adding an acid to consume the excess alkalinity of the COPR, resulting in a pH of less than 10; and adding a chemical reductant to the COPR to convert any hexavalent chromium present to trivalent chromium. A source of sulfate may be added to the COPR to reduce heave potential and improve its geotechnical stability. Treated COPR may be encapsulated in a material suitable to prevent contact between the COPR and water, such as an asphalt. | | Filing Date: 2006-03-31 | | Granting Date: 2008-11-18 | | Download Patent |
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