Process for the detoxification of cyanide-containing aqueous solutions
Patent 5207925 Issued on May 4, 1993. Estimated Expiration Date: 
March 26, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 26, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References T102905 2533660 3510424 3617567 3617582 3715309 3843516 Process for detoxification of cyanides and nitriles with peroxygen compounds Method for liquifying chloride-based heavy brine well completion fluids High active oxygen content granulated sodium perborate product and method of making the same Patent #: 5094827 InventorsAssigneeApplicationNo. 857414 filed on 03/26/1992US Classes:210/746, Electrical property sensing210/759, Utilizing peroxy compound (e.g., hydrogen peroxide, peracid, etc.)210/763, Catalytic210/904-CN containingExaminersPrimary: Silverman, Stanley S.Assistant: McCarthy, Neil Attorney, Agent or FirmForeign Patent References
International ClassC02F 001/72Foreign Application Priority Data1991-03-27 DEAbstractA process is disclosed for the detoxification of aqueous solutions containing cyanides and/or cyano complexes in the presence of heavy metals which are Mn, Co, Ni, Cu, Cd and Zn, more particularly Cu, by oxidative treatment of the solutions with peroxide compounds at pH values of 8 to 12. Peroxide compounds from the group consisting of alkali metal percarbonates and alkaline earth metal peroxides are used. The peroxide compounds are added to the solutions to be detoxified per se or are formed in situ therein from hydrogen peroxide and other components. Sodium perborate, sodium percarbonate and calcium peroxide are preferred.Other References
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