Umicore

Werner Verdickt

Wannes De Moor

Joris Roosen

The present invention provides a process for preparing a high-purity nickel sulphate solution, comprising the steps of: i. forming an aqueous mixed metal sulphate solution by reacting sulphuric acid with a raw material feed comprising nickel, manganese, cobalt, and magnesium in an aqueous medium; ii. extracting manganese from said aqueous mixed metal sulphate solution, thereby obtaining a first aqueous raffinate comprising nickel, cobalt and magnesium, and a manganese-rich organic phase; iii. extracting cobalt from said first aqueous raffinate, thereby obtaining a second aqueous raffinate comprising nickel and magnesium, and a cobalt-rich organic phase; and iv. extracting magnesium from said second aqueous raffinate solution, thereby obtaining a high-purity nickel sulphate solution, and a magnesium-rich organic phase.

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Olen, Belgium

Werner Verdickt