Method for separating impurities from an acidic solution containing nickel and cobalt and/or scandium
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, R 1 and R 2 each represent the same or different alkyl groups, R 3 represents a hydrogen atom or an alkyl group, and R 4 represents a hydrogen atom or a given group, other than an amino group, that bonds with an α 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.
1. A method of subjecting an acid solution containing at least one or more valuable components selected from nickel, cobalt, and scandium and one or more impurities selected from manganese, zinc, iron, aluminum, calcium, chromium, magnesium, copper, lead, sodium, lanthanum, neodymium, molybdenum, vanadium, tin, tungsten, samarium, rhenium, thallium, cerium, titanium, and lutetium to solvent extraction with a valuable metal extraction agent that comprises an amide derivative represented by the following general formula (I) to separate the valuable components and the impurities from the acid solution,
wherein, R 1 and R 2 each represent the same or different alkyl groups;
the alkyl group can be a straight chain or a branched chain;
R 3 represents a hydrogen atom or an alkyl group; and
R 4 represents a hydrogen atom or any group other than an amino group, which is bound to the α carbon as an amino acid.
2. The method according to claim 1 , wherein the amide derivative is any one or more of glycinamide derivatives, histidinamide derivatives, lysinamide derivatives, aspartamide derivatives, and N-methylglycine derivatives.
3. The method according to claim 1 , wherein
the acid solution contains nickel and zinc, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.3.
4. The method according to claim 1 , wherein
the acid solution contains nickel and iron,
when the iron is trivalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.0 to 3.2, and
when the iron is divalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.5.
5. The method according to claim 1 , wherein
the acid solution contains cobalt and iron,
when the iron is trivalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.0 to 4.0, and
when the iron is divalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.5.
6. The method according to claim 1 , wherein
the acid solution contains nickel and aluminum, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.5.
7. The method according to claim 1 , wherein
the acid solution contains nickel and/or cobalt and calcium, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.0.
8. The method according to claim 1 , wherein
the acid solution contains cobalt and chromium, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.8 to 3.5.
9. The method according to claim 1 , wherein
the acid solution contains nickel, cobalt, and/or scandium, and molybdenum, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 0 to 2.
10. The method according to claim 1 , wherein
the acid solution contains scandium, and divalent iron and/or aluminum, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.2 to 4.5.
11. The method according to claim 1 , wherein
the acid solution contains scandium and chromium, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.2 to 3.5.
12. The method according to claim 2 , wherein
the acid solution contains nickel and zinc, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.3.
13. The method according to claim 2 , wherein
the acid solution contains nickel and iron,
when the iron is trivalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.0 to 3.2, and
when the iron is divalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.5.
14. The method according to claim 2 , wherein
the acid solution contains cobalt and iron,
when the iron is trivalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.0 to 4.0, and
when the iron is divalent iron, the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.5.
15. The method according to claim 2 , wherein
the acid solution contains nickel and aluminum, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.5.
16. The method according to claim 2 , wherein
the acid solution contains nickel and/or cobalt and calcium, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.0 to 4.0.
17. The method according to claim 2 , wherein
the acid solution contains cobalt and chromium, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 2.8 to 3.5.
18. The method according to claim 2 , wherein
the acid solution contains nickel, cobalt, and/or scandium, and molybdenum, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 0 to 2.
19. The method according to claim 2 , wherein
the acid solution contains scandium, and divalent iron and/or aluminum, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.2 to 4.5.
20. The method according to claim 2 , wherein
the acid solution contains scandium and chromium, and
the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 1.2 to 3.5.