How to crystallize a cobalt sulfate solution?

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Eduard Rusanov

Check the solubility of cobalt sulfate!

en.wikipedia.org/wiki/Cobalt(II)_sulfate

so, your solution at the concentration of around 10% is still not saturated! You need a more concentrated solution for crystallization!

Carlos Araújo Queiroz

Cobalt sulfate heptahydrate (CoSO4.7H2O; bieberite) should crystallize below ~42 ºC; monohydrate crystallizes above 62°C; dihydrate and tetrahydrate form metastable phases.

Cf.: J.L. Jambor, D.K. Nordstrom, C.N. Alpers, "Metal-sulfate salts from sulfide mineral oxidation", Rev. Mineral. Geochem., 40(1) 2000, 303–350; 'Gmelin Handbuch der Anorganischen Chemie', 'Kobalt', 8. Auflage, System‐Nummer 58, Teil A‐Ergänzungsband, Verlag Chemie GMBH, Weinheim/Bergstrasse, West Germany, 1961.

Lee Clawson

The included link should help you...Semi-batch evaporative crystallization and drying of cobalt sulphate hydrates at this link: Article Semi-batch evaporative crystallization and drying of cobalt ...