Method of treatment, stabilization and heave control for...

Hydraulic and earth engineering – Earth treatment or control – Chemical

Reexamination Certificate

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Reexamination Certificate

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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.

REFERENCES:
patent: 3294680 (1966-12-01), Lancy
patent: 3679557 (1972-07-01), Gilby et al.
patent: 3784669 (1974-01-01), Elges et al.
patent: 3937785 (1976-02-01), Gancy et al.
patent: 3969246 (1976-07-01), Feltz et al.
patent: 3981965 (1976-09-01), Gancy et al.
patent: 4504321 (1985-03-01), Kapland et al.
patent: 5122012 (1992-06-01), Walker, Jr.
patent: 5202033 (1993-04-01), Stanforth et al.
patent: 5228808 (1993-07-01), McKennon et al.
patent: 5285000 (1994-02-01), Schwitzgebel
patent: 5304710 (1994-04-01), Kigel et al.
patent: 5397478 (1995-03-01), Pal et al.
patent: 5562588 (1996-10-01), Higgins
patent: 5967965 (1999-10-01), Vyshkina et al.
patent: 6221002 (2001-04-01), James
patent: 2003/0073877 (2003-04-01), Yen
patent: 2004/0086438 (2004-05-01), Sreeram et al.
patent: 2004/0126189 (2004-07-01), Chowdhury
patent: 43 19 974 (1994-12-01), None
patent: 2 238 258 (1990-05-01), None
patent: WO 03/022744 (2003-03-01), None
International Search Report and Written Opinion of International Searching Authority issued in related International Patent Application No. PCT/US06/012662.
ASTM Standard D 4546-90, Standard Test Methods for One-Dimensional Swell or Settlement Potential of Cohesive Soils. 1990. American Society for Testing and Materials.
ASTM D 3877-80, Standard Test Methods for One-Dimensional Expansion, Shrinkage and Uplift Pressure of Soil-Lime Mixtures. 1980. American Society for Testing and Materials.
S. Wild, et al., Suppression of swelling associated with ettringite formation in lime stabilized sulphate bearing clar soils by partial substitution of lime with ground granulated blast furnace slag. Engineering Geology 51. 1999. pp. 257-277. Elsevier Science B.V.
D. Dermatas, Ettringite-induced swelling in soils: State-of-the-art. Appl. Mech. Rev., vol. 48, No. 10 Oct. 1995. pp. 659-673.
International Preliminary Report on Patentability for International (PCT) Application No. PCT/US2006/012662, mailed Oct. 11, 2007.

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