Hydraulic and earth engineering – Earth treatment or control – Chemical
Reexamination Certificate
2006-03-31
2008-11-18
Kreck, John (Department: 3672)
Hydraulic and earth engineering
Earth treatment or control
Chemical
Reexamination Certificate
active
07452163
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.
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Dermatas Dimitris
Kalyon Dilhan M.
Kaouris Maria
Meng Xiaoguang
Morris John J.
Greenberg & Traurig, LLP
Kreck John
The Trustees of Stevens Institute of Technology
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