Cyanide detoxification process
AssigneeThe Board of Regents of the University and Community College System of Nevada
InventorsManoranjan Misra, Gautam Priyadarshan, Birendra Kumar Jena
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Abstract
Methods for rendering a cyanide or cyanide-containing compound substantially insoluble in an aqueous solution or suspension of cyanide-containing materials comprising: mixing a reagent comprising a thiosulfate salt with said solution or suspension; and adding to said material a complexing agent selected from the group consisting of divalent copper salts, divalent iron salts, divalent cobalt salts, activated carbon and mixtures of the foregoing are provided.
Claims17
A method for rendering a cyanide-containing compound substantially insoluble in an aqueous solution or suspension of cyanide-containing materials comprising:
- a) mixing a reagent comprising a thiosulfate salt with said solution or suspension;
- and
- b) adding to said material cobalt sulfate.
A method for rendering a cyanide-containing compound substantially insoluble in an aqueous solution or suspension of cyanide-containing materials comprising:
- a) mixing a reagent comprising a thiosulfate salt with said solution or suspension;
- and
- b) adding to said material activated carbon.
A method for destroying cyanide in a first cyanide-containing solution or suspension consisting essentially of:
- adding a reagent comprising a thiosulfate salt to said first solution or suspension to form a second solution or suspension;
- mixing said second solution or suspension for a time of about 5 to about 50 minutes;
- adding to said second solution or suspension a complexing agent selected from the group consisting of divalent copper salts, divalent iron salts, divalent cobalt salts, activated carbon, and mixtures of the foregoing to form a third solution or suspension;
- and mixing said third solution or suspension for a time of about 2 to about 20 minutes, whereby a portion of the cyanide in said first solution or suspension forms a precipitate.
A method for destroying cyanide in a first cyanide-containing solution or suspension consisting essentially of:
- adding a reagent comprising a thiosulfate salt to said first solution or suspension to form a second solution or suspension;
- mixing said second solution or suspension for a time of about 5 to about 50 minutes;
- adding to said second solution or suspension a complexing agent selected from the group consisting of divalent copper salts, divalent iron salts, divalent cobalt salts, activated carbon, and mixtures of the foregoing to form a third solution or suspension;
- and mixing said third solution or suspension for a time of about 2 to about 20 minutes, whereby a portion of the cyanide in said first solution or suspension forms a precipitate;
- and separating said precipitate from said third solution or suspension.
A method for rendering a cyanide-containing compound substantially insoluble in an aqueous solution or suspension of cyanide-containing materials comprising:
- a) first mixing a reagent comprising a thiosulfate salt with said solution or suspension, forming a first composition;
- and
- b) then adding to the first composition a complexing agent selected from the group consisting of divalent copper salts, divalent iron salts, divalent cobalt salts, activated carbon, and mixtures of the foregoing.
Dependencies are inferred from the claim text.