Sulfuric acid nickel sulfate → Nickel Sulfate

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Reaction Steps

The nickel salt precipitate is next redissolved in solution and re-precipitated as a nickel sulfate starter salt of suitable quality for use in making an active positive electrode material. Preferably, the nickel salt precipitate is dissolved in sulfuric acid to form a nickel sulfate solution and then precipitated out with a condensation precipitation step. The sulfuric acid is preferably concentrated sulfuric acid having a concentration range of 50% to 99%. A condensation precipitation step provides superior nickel sulfate in comparison to nickel sulfate without a condensation precipitation step. For example, the nickel carbonate precipitate formed above may be dissolved in sulfuric acid to form a nickel sulfate solution. The sulfuric acid/nickel sulfate solution is then diluted with water. Water is evaporated from the nickel sulfate solution to precipitate a nickel sulfate solid. The nickel sulfate solid is separated from the sulfate solution by any suitable separation process, such as filtration, decantation, etc. The nickel sulfate solid may then be redissolved in water to form aqueous nickel sulfate suitable for use as a nickel hydroxide starter solution.

Provenance & Evidence