Les Sulfates Basiques Mixtes de Cuivre et de Zinc

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Abstract
The pure basic sulphates of copper and zinc obtained at 20°C by addition of soda to CuSO4 and ZnSO4. solutions have the respective compositions Cu4 (OH)6SO4(monoclinic symmetry) and 3 Zn(OH)2·ZnSO4·4 H2O (hexagonal symmetry with double layers). In mixed solutions (10 g Me++/l), the solid solution Cu4‐xZnx (OH)6SO4 precipitates at the low zinc concentrations. The distribution curve shows a change of slope at 25% Zn at. (x = I). A transition zone caracterized by a continue modification of the structure and the hydration of the precipitate separates this compound from the tribasic sulphate of zinc saturated by copper (33% Cu at.). For this solid solution the substitution occurs in the hydroxide layers only. The distribution factor indicates a continue selectivity for copper in the different phases.