チオアセトアミド法による均一溶液からの硫化カドミウム沈殿に対する亜鉛の共沈殿

概要

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Zinc coprecipitates with diverse metal sulfides in an acidic medium. The coprecipitation of zinc with cadmium sulfide from homogeneous, solution using thioacetamide as a source of hydrogen sulfide was studied as an example of the sulfide coprecipitation. Thioacetamide was added to a mixed solution of cadmium nitrate and zinc sulfate in 2F perchloric acid and the reaction was carried out at 3040°C. The coprecipitation of zinc with cadmium sulfide belongs to the derichment system. The coprecipitation began even in the early stage of the precipitation and it increased rapidly at the end of the precipitation. Throughout the process of cadmium sulfide precipitation the coprecipitation of zinc obeyed the law of logarithmic distribution introduced by Doerner and Hoskins and the logarithmic distribution coefficient, λ, was found to be about 0.004 at 33°C. The coprecipitation was almost unaffected by stirring. The distribution coefficient decreased with increasing reaction temperature and then cadmium can be separated more effectively at higher temperature than at lower temperature. Thioacetamide should be used as 23 folds of cadmium content. The quantity of zinc coprecipitated depended on the quantity of cadmium present, that is, the distribution coefficient decreased with increasing quantity of zinc.
社団法人日本分析化学会の論文