Method for recovering at least one valuable containing tungsten
Provided is a method for efficiently separating and recovering tungsten and other valuable(s) from at least one valuable containing tungsten. The present invention relates to a method for recovering at least one valuable containing tungsten, comprising subjecting a raw material mixture comprising at least one valuable containing tungsten to electrolysis using an electrolytic solution containing at least one alcohol amine to dissolve tungsten in the electrolytic solution, electrodeposit a part of the valuable(s) onto a cathode used for the electrolysis and separate at least one valuable other than the valuable(s) electrodeposited onto the cathode as a residue in the electrolytic solution, and then separating and recovering each of the residue and the valuable(s) electrodeposited onto the cathode.
1. A method for recovering at least one valuable containing tungsten, comprising subjecting a raw material mixture comprising at least one valuable containing tungsten to electrolysis using an electrolytic solution containing at least one alcohol amine to dissolve tungsten in the electrolytic solution, electrodeposit a part of the valuable(s) onto a cathode used for the electrolysis and separate at least one valuable other than the valuable(s) electrodeposited onto the cathode as a residue in the electrolytic solution, and then separating and recovering each of the at least one valuable in the residue, tungsten dissolved in the electrolytic solution, and the valuable(s) electrodeposited onto the cathode.
2. The method for recovering the at least one valuable containing tungsten according to claim 1 , wherein the valuable(s) to be electrodeposited onto the cathode used for the electrolysis is one or more selected from the group consisting of cobalt, nickel, iron, chromium and vanadium.
3. The method for recovering the at least one valuable containing tungsten according to claim 2 , wherein the cathode used for the electrolysis is formed of titanium, stainless steel, iridium, niobium or zirconium.
4. The method for recovering the at least one valuable containing tungsten according to claim 1 , wherein the at least one valuable that is the residue in the electrolytic solution is one or more selected from the group consisting of titanium, tantalum and silica.
5. The method for recovering the at least one valuable containing tungsten according to claim 1 , wherein the at least one alcohol amine is monoethanolamine and/or triethanolamine.
6. The method for recovering the at least one valuable containing tungsten according to claim 1 , wherein a concentration of the alcohol amine in the electrolytic solution is from 1 to 80% by mass.
7. The method for recovering the at least one valuable containing tungsten according to claim 1 , wherein the raw material mixture contains from 1 to 30% by mass of at least one valuable other than tungsten.
8. The method for recovering the at least one valuable containing tungsten according to claim 7 , wherein the raw material mixture contains from 1 to 10% by mass of at least one valuable other than tungsten.
9. The method for recovering the at least one valuable containing tungsten according to claim 8 , wherein the raw material mixture contains from 3 to 10% by mass of at least one valuable other than tungsten.
10. The method for recovering the at least one valuable containing tungsten according to claim 1 , wherein the electrolysis is carried out by adjusting a temperature of the electrolytic solution to 20 to 80° C.
11. The method for recovering the at least one valuable containing tungsten according to claim 1 , wherein the electrolytic solution has a pH of 9 or more.
12. The method for recovering the at least one valuable containing tungsten according to claim 1 , wherein an anode used for the electrolysis is a titanium basket provided with the raw material mixture comprising the at least one valuable containing tungsten.
13. The method for recovering the at least one valuable containing tungsten according to claim 1 , wherein separation efficiency Co/W of cobalt Co in the valuable(s) deposited onto the cathode to tungsten W is 100 or more.
14. The method for recovering the at least one valuable containing tungsten according to claim 2 , wherein the at least one valuable that is the residue in the electrolytic solution is one or more selected from the group consisting of titanium, tantalum and silica.
15. The method for recovering the at least one valuable containing tungsten according to claim 3 , wherein the at least one valuable that is the residue in the electrolytic solution is one or more selected from the group consisting of titanium, tantalum and silica.
16. The method for recovering the at least one valuable containing tungsten according to claim 2 , wherein the at least one alcohol amine is monoethanolamine and/or triethanolamine.
17. The method for recovering the at least one valuable containing tungsten according to claim 3 , wherein the at least one alcohol amine is monoethanolamine and/or triethanolamine.
18. The method for recovering the at least one valuable containing tungsten according to claim 4 , wherein the at least one alcohol amine is monoethanolamine and/or triethanolamine.
19. The method for recovering the at least one valuable containing tungsten according to claim 2 , wherein a concentration of the alcohol amine in the electrolytic solution is from 1 to 80% by mass.
20. The method for recovering the at least one valuable containing tungsten according to claim 3 , wherein a concentration of the alcohol amine in the electrolytic solution is from 1 to 80% by mass.