Method for leaching nickel from nickel ore and method for producing nickel sulfate

Patent metadata

Field	Value
Publication number	US-2023257282-A1
Application number	US-202318166072-A
Country	US
Kind code	A1
Filing date	Feb 8, 2023
Priority date	Feb 16, 2022
Publication date	Aug 17, 2023
Grant date	—

Abstract

Provided is a method for leaching nickel from a nickel oxide ore that enables a nickel sulfate production method which is easily carried out with a small amount of waste generation. The method for leaching nickel into an organic phase disclosed here includes the step of bringing a nickel ore into contact with an organic phase. The organic phase contains a hydrophobic deep eutectic solvent including a hydrogen bond donor and a hydrogen bond acceptor, and an organic acid. The hydrogen bond donor is an acidic hydrogen bond donor. The organic acid is a strong acid.

First claim

What is claimed is:

1 . A method for leaching nickel into an organic phase, the method comprising the step of bringing a nickel ore into contact with the organic phase, wherein
the organic phase contains a hydrophobic deep eutectic solvent and an organic acid, the hydrophobic deep eutectic solvent including a hydrogen bond donor and a hydrogen bond acceptor, the hydrogen bond donor is an acidic hydrogen bond donor, and the organic acid is a strong acid.

2 . The method according to claim 1 , wherein a mass proportion of the organic acid with respect to the hydrophobic deep eutectic solvent is 9 mass% or more and 20 mass% or less.

3 . The method according to claim 1 , wherein the hydrogen bond donor is a fatty acid, and the hydrogen bond acceptor is a quaternary ammonium halide.

4 . The method according to claim 1 , wherein the organic acid is an organic sulfonic acid compound.

5 . A method for producing nickel sulfate, the method comprising the steps of
obtaining a nickel leachate by the leaching method according to claim 1 ; and obtaining an aqueous phase containing nickel sulfate by performing back extraction on the nickel leachate using sulfuric acid.

6 . The method according to claim 5 , wherein in the step of obtaining the aqueous phase, a concentration of sulfuric acid is 2 mol/L or more.

7 . The method according to claim 5 , wherein in the step of obtaining the aqueous phase, back extraction is performed after the nickel leachate is diluted with a hydrophobic organic solvent.

Assignees

• Prime Planet Energy & Solutions Inc
• Univ Kyushu Nat Univ Corp
• Toyota Tsusho Corp
• Toyota Motor Co Ltd

Inventors

• Yamamoto Yuji
• Goto Masahiro
• Hanada Takafumi
• Moriyama Takeru
• Ohsawa Ryosuke

Classifications

• C01G53/01 Primary

  Preparation or separation involving a liquid-liquid extraction, an adsorption or an ion-exchange · CPC title

• C22B3/165 Primary

  with organic acids · CPC title

• C22B3/08

  Sulfuric acid {, other sulfurated acids or salts thereof} · CPC title

• C22B3/22

  by physical processes, e.g. by filtration, by magnetic means {, or by thermal decomposition} (treatment or purification of solutions by liquid-liquid extraction C22B3/26) · CPC title

• C22B23/043

  Sulfurated acids or salts thereof · CPC title