Les Chlorures Basiques Mixtes de Zinc et de Cobalt

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Abstract
By the addition of soda to a solution of ZnCl2 or CoCl2, the following compounds are precipitated: 4 Zn(OH)2. ZnCl2. I H2O (20 and 75°C), 4 Co(OH)2. Co(OH)0,6(Cl)I,4.4 H2O (20°C) and Co2(OH)3, 2(Cl)O,8.O,7 H2O (75°C). At 20°C, the two salts are isomorphous.In the mixed solution ZnCl2‐CoCl2, at 20°C, a continuous solid solution is formed characterized by a progressive variation of the basicity index between 33 and 63% Co. at. The distribution factor shows an important retention of zinc in the cobalt salt. At 75°C, the solubility of cobalt in the zinc tetrabasic chloride rises to 67% Co. at. A zone of demixtion separates the latter from the compound of cobalt which contains a maximum of 6,5% Zn. at.