抄録
CuCN was dissolved in highly concentrated alkaline solution. The color of the dissolved solution showed a transparent blue. The production of soluble cyanide copper complex was indicated by the measurement of ultraviolet and visible absorption spectra for the supernatant solution obtained by filtration. CN- ion were not detected in the solution during the reaction process. The concentration of OH- ion decreased about 5-fold in comparison with the initial concentration of CuCN. The soluble cyanide copper complex changed to insoluble fine black particles by reacting with OH- ions. From the XRD measurement, the fine black particles were identified as CuO. From the gravimetric analysis, the production yield of CuO could estimated to be 50% due to change of the oxidation number from I to II.
