Sumitomo Metal Mining Company, Ltd.

Kyushu University

Jiro Hayata

Tatsuya Higaki

Yoshitomo Ozaki

Masahiro Goto

Fukiko Kubota

Yuzo Baba

Hirofumi Shoji

Toshihiko Nagakura

Shinya Matsumoto

Keiji Kudou

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 for efficiently separating nickel, cobalt and/or scandium, and impurities from an acidic solution containing impurities such as manganese, iron, zinc, and aluminum. A valuable-metal extracting agent of the present invention is expressed by general formula (1). In the formula, Rand Reach represent the same or different alkyl groups, Rrepresents a hydrogen atom or an alkyl group, and Rrepresents a hydrogen atom or a given group, other than an amino group, that bonds with an &#x3b1; carbon as an amino acid. In general formula (1), the inclusion of a glycine unit, a histidine unit, a lysine unit, an asparagine acid unit, or a normal methylglycine unit is preferred. 

Method for separating impurities from an acidic solution containing nickel and cobalt and/or scandium

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Ehime, Japan

Jiro Hayata