Sumitomo Metal Mining Company, Ltd.

Keiji Kudou

Shin-Ichi Heguri

Satoshi Asano

Itsumi Matsuoka

Hirofumi Shouji

Hiroshi Takenouchi

Yoshitomo Ozaki

Tatsuya Higaki

Hideki Ohara

Shin-ichi Heguri

Hirofumi Shoji

Atsushi Idegami

Jiro Hayata

Shinya Matsumoto

A nickel recovery process capable of decreasing nickel remaining in a byproduct by recovering nickel from the byproduct of electrolytic nickel manufacturing process by chlorine-leaching, and also, capable of simplifying a cementation step simultaneously, is provided. In a nickel recovery step S, a nickel recovery step Sand a nickel recovery step S, nickel is recovered in each step from Sslurry, residue flaker and chlorine-leached residue, which are byproducts of electrolytic nickel manufacturing process by chlorine-leaching, by using an aqueous solution containing 80 g/L to 390 g/L of chlorine and 30 g/L to 70 g/L of copper.

Nickel recovery process

Provided is a method of producing high-purity nickel sulfate by an impurity-element removal method for selectively removing Mg from a Ni-containing solution. The method comprises a production process of producing nickel sulfate from a Ni-containing acid solution, the acid solution being treated in order of steps (1) to (3): (1) carbonation step, adding a carbonating agent into the Ni-containing solution to make Ni contained in the Ni-containing solution into a precipitate of nickel carbonate or a mixture of nickel carbonate and nickel hydroxide, thereby forming a slurry after carbonation including the precipitate and a solution after carbonation; (2) solid-liquid separation step, separating the slurry after carbonation formed in the carbonation step into the precipitate and the solution after carbonation; and (3) neutralization step, adding a neutralizing agent into the solution after carbonation separated through the solid-liquid separation step to recover Ni contained in the solution after carbonation as a Ni-precipitate.

Method for producing high-purity nickel sulfate

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Ehime, Japan

Keiji Kudou