FIELD: inorganic synthesis. SUBSTANCE: cobalt(II) basic carbonates of general formulas Co[(OH)2]a[CO3]1-a, wherein 0.2 ≤ a ≤ 1, and Co[(OH)2]a[C2O4]b[CO3]1-a-b, wherein 0 ≤ a <1 and 0 <b ≤ 1, are prepared as follows: cobalt metal is subjected to anodic oxidation in carbon dioxide-saturated aqueous electrolyte solutions containing alkali metal carbonates and/or bicarbonates and, when mixed carbonates and oxalates are prepared, in presence of also oxalic acid and/or oxalates. Electrolyte solutions as well contain, as conducting salts, alkali metal chlorides in concentration 0.1-5 mol/l or alkali metal sulfates in concentration 0.1 mol/l, and/or cobalt(II) chloride in concentration no higher than 0.1 mol/l. EFFECT: improved quality of salts and their filtration capability. 8 cl, 1 dwg, 1 tbl, 9 ex
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