Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1992-05-21
1993-11-23
Dees, Jose G.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423143, 423379, 423371, 588246, C02F 152, C22B 1108
Patent
active
052641929
ABSTRACT:
A method for treating cyanide-contaminated water in order to remove dissolved (e.g. free) cyanide (HCN and/or CN.sup.-) therefrom. Cyanide-contaminated water is a significant problem in the gold processing industry wherein cyanide compounds are used to remove gold from ore. The remaining cyanide solution after gold extraction is treated to reduce free cyanide levels therein by combining the solution with a crystalline waste by-product of the metal galvanizing industry having the following formula: (Fe.multidot.Zn)SO.sub.4 .multidot.7H.sub.2 O. This material preferably has a zinc content of about 1-14% by weight, and is added to the water in an amount equal to about 1-5 pounds per ton of ore being processed. As a result, a stable, solid, non-toxic complex is produced from the toxic free cyanide materials. This is accomplished without the generation of harmful acids, heavy metals, excessive iron levels or other undesired by-products.
REFERENCES:
Clennell, J. E., The Cyanide Handbook, McGraw-Hill (1915), pp. 102-132.
Thomas, R. (ed.), E/MJ Operating Handbook of Mineral Processing, McGraw-Hill, Inc., pp. 22-23 (1977).
The Making, Shaping, and Treating of Steel, a publication of the United States Steel Company, Pittsburgh, Pa., 6th ed. (1952), pp. 935-939.
Eaman Richard H.
Shutt Thomas C.
Conrad Joseph
Dees Jos,e G.
Malkin Jay K.
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