As mentioned above, 10 mg/L Cu^sup 2+^, in the form of CuSO^sub 4^, was added to the solution during the preparation of CN^sup -^-CNO^sup -^ solution. Cupric ions form a predominant cyanide complex, Cu(CN)^sub 3^^sup 2-^ (Osseo-Asare et al., 1984). The copper concentration in solution remained constant at 10 mg/L during the 48 hours of the CN^sup -^CNO^sup -^ solution-preparation period. No precipitation of copper oxide or hydroxide occurs, even at pH 9.0 to 9.5.
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"Reduction of cyanate to cyanide in cyanidation tailings under reducing environments"Please download to view full document