Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1991-06-05
1994-11-15
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423 29, 423372, 423379, 4236585, 210904, C01C 300
Patent
active
053646053
ABSTRACT:
Process for recovering cyanide values from a mill tailings stream remaining after gold and silver have been leached from an ore, by treating the tailings stream containing both ore insolubles and remaining cyanide leachant, without a preliminary filtration, to acidification with an acid to a pH of at least 4, stripping the cyanide values therefrom with a stripping gas in a stripping column such as a baffle plate column wherein the average residence time of the column is sufficiently low that the pH of the stream does not rise above about 4 and the ore insolubles do not plug the column, introducing the stripping gas and stripped cyanide values into an absorbing column containing an alkaline liquor to absorb the cyanide values, recovering the absorbed cyanide values, and removing a stripped tailings stream reduced in cyanide values.
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Michael J. Kitney-Cyanide Regeneration from Gold Tailings-Perth Gold Conference, pp. 88-93, 1988.
Pfeffer Henry A.
Wolfe Gary E.
Andersen Robert L.
FMC Corporation
Ianno Frank
Straub Gary P.
Vanoy Timothy C.
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