Process for treating waste containing cyanates

Details Process for treating waste containing cyanates Process for treating waste containing cyanates

1992-03-20

1993-12-21

Hruskoci, Peter A.

Liquid purification or separation

Processes

Including geographic feature

210752, 210758, 210766, 210904, 423368, C02F 166

Patent

active

052718492

ABSTRACT:
A process is provided for removing ammoniacal values of potential environmental concern, both present and latent, from cyanate-containing waste streams and water-wet waste solids, typically generated in gold leaching or electroplating operations. The process includes heating the waste material to a temperature in excess of 50.degree. C. to convert ammonium cyanate to urea and optionally reducing pH to a range of 2.5 to 5 to accelerate hydrolysis of cyanate to ammonium carbonate, to supply ammonium ions for reacting with unhydrolyzed cyanate.

REFERENCES:
patent: 4341641 (1982-07-01), Novak
patent: 4689156 (1987-08-01), Zibrida
patent: 5120451 (1992-06-01), Costello et al.
"New Process Detoxifies Cyanide Wastes," Environmental Science & Technology, vol. 5, 1971, pp. 496-497.
J. Ingles & J. S. Scott, "State-of-the-Art of Processes for the Treatment of Gold-Mill Effluents", unpublished report of the Environmental Protection Service, Canada, (Mar. 1987), pp. i, 5.15-5.18.
I. A. Kempt G. Kohnstam, "The Decomposition of Inorganic Cyanates in Water" J. Chem. Soc. pp. 900, 901, 904, (1956).
J. Walker & S. A. Kay, "Velocity of Urea Formation in Aqueous Alcohol" J. Chem. Soc. 71 pp. 489, 495, 504, 508 (1897).
J. Walker & F. J. Humbly, "Transformation of Ammonium Cyanate into Urea" J. Chem. Soc. 67 pp. 746, 754-757 (1895).

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