Method for producing high-purity nickel sulfate

Patent metadata

Field	Value
Publication number	US-9702023-B2
Application number	US-201314387571-A
Country	US
Kind code	B2
Filing date	Feb 13, 2013
Priority date	Mar 29, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

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.

First claim

The invention claimed is:

1. A method comprising:
providing a nickel-containing solution,
treating the nickel-containing solution in order of the following steps of (1) to (3):
(1) adding a carbonating agent to the nickel-containing solution,
precipitating a carbonated nickel precipitate of nickel carbonate or a mixture of nickel carbonate and nickel hydroxide;
(2) separating the carbonated nickel precipitate and a solution after carbonation; and
(3) adding a neutralizing agent to the solution after carbonation, and therefrom recovering a nickel precipitate.

2. The method of claim 1 , wherein the nickel-containing solution is a nickel sulfate solution.

3. The method of claim 2 , wherein the nickel sulfate solution was obtained by leaching a nickel oxide ore with sulfuric acid, separating impurities other than a target component to obtain a residue, and adding a sulfurizing agent to the residue to form a nickel sulfide, and then leaching the nickel sulfide with sulfuric acid.

4. The method of claim 1 , wherein the nickel-containing solution is a nickel sulfate solution obtained by leaching a nickel oxide ore with sulfuric acid, separating impurities other than a target component to obtain a residue, and adding a sulfurizing agent to the residue to form a nickel sulfide, and then leaching the nickel sulfide with sulfuric acid.

5. The method of claim 1 wherein the nickel-containing solution is a crude nickel sulfate solution; wherein the crude nickel sulfate solution includes nickel and magnesium.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Idegami Atsushi
• Ozaki Yoshitomo
• HEGURI Shin-ichi
• Kudou Keiji
• Ohara Hideki
• Matsumoto Shinya

Classifications

• C22B23/0469 Primary

  by chemical substitution, e.g. by cementation · CPC title

• C01P2006/80

  Compositional purity · CPC title

• C01G53/10 Primary

  Sulfates · CPC title

• C22B23/0461

  by chemical methods · CPC title

• Y02P10/20

  Recycling · CPC title