Chemistry of inorganic compounds – Nitrogen or compound thereof – Carbon containing
Patent
1980-08-08
1981-05-12
Hearn, Brian E.
Chemistry of inorganic compounds
Nitrogen or compound thereof
Carbon containing
423367, 4236585, 423 24, 423 29, 210683, 210684, 210904, 75105, C01C 308, B01J 4104, C02F 142, C22B 300
Patent
active
042671590
ABSTRACT:
Spent aqueous liquor containing cyanide, as from ore treatment, is passed through a bed of suitable anion-exchange resin to segregate the cyanide, which is subsequently recovered in regeneration of the resin by weak alkaline solution. Both the eluted cyanide and the alkaline regenerant are recycled, if desired, for further ore treatment. A most important benefit of such procedure is nearly complete elimination of cyanide as a component of the treatment effluent. Free cyanide may be separated from complexed cyanides when present by using weak alkaline regenerant to elute the free cyanide from the resin and stronger alkaline regenerant to elute the complexed cyanides.
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Goldblatt "Recovery of Cyanide from Waste Cyanide Solutions by Ion Exchange", Industrial and Engineering Chemistry (3/59) pp. 241-246. _
Yagashita et al., "Regeneration of Anion Exchange Resins Containing Cyanide from Waste Water" in Chemical Abstracts, vol. 79 (1973) No. 96,643s. _
Crane & Co.
Hearn Brian E.
McClure Charles A.
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