Method for producing tungsten
Provided is a method for efficiently producing tungsten from a raw material mixture comprising at least one valuable containing tungsten. The present invention relates to a method for producing tungsten, comprising the steps of subjecting a raw material mixture comprising at least one valuable containing tungsten to electrolysis using an organic electrolytic solution to dissolve tungsten in the electrolytic solution; and calcining the electrolytic solution containing dissolved tungsten at a temperature of less than 800° C. to obtain tungsten.
1. A method for producing tungsten, comprising the steps of:
subjecting a raw material mixture comprising at least one valuable containing tungsten to electrolysis using an organic electrolytic solution to dissolve tungsten in the electrolytic solution; and
calcining the electrolytic solution containing dissolved tungsten at a temperature of less than 800° C. to obtain tungsten.
2. The method for producing tungsten according to claim 1 , wherein the organic electrolytic solution is an organic alkaline electrolytic solution.
3. The method for producing tungsten according to claim 2 , wherein the organic alkaline electrolytic solution contains at least one alcohol amine.
4. The method for producing tungsten according to claim 3 , wherein the at least one alcohol amine is monoethanolamine and/or triethanolamine.
5. The method for producing 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.
6. The method for producing tungsten according to claim 5 , wherein the raw material mixture contains from 1 to 10% by mass of at least one valuable other than tungsten.
7. The method for producing tungsten according to claim 6 , wherein the raw material mixture contains from 3 to 10% by mass of at least one valuable other than tungsten.
8. The method for producing tungsten according to claim 1 , wherein the electrolysis is carried out by adjusting a temperature of the electrolytic solution to 20 to 80° C.
9. The method for producing tungsten according to claim 2 , wherein the electrolytic solution has a pH of 7 or more.
10. The method for producing tungsten according to claim 1 , wherein tungsten carbide is obtained simultaneously with the tungsten in the step of calcining the electrolytic solution containing dissolved tungsten at the temperature of less than 800° C. to obtain tungsten.
11. The method for producing tungsten according to claim 1 , wherein after the step of dissolving tungsten in the electrolytic solution, the electrolytic solution is subjected to preliminary heating to reduce water content, and then carrying out the calcining step to obtain tungsten.
12. The method for producing tungsten according to claim 1 , wherein an anode used for the electrolysis is a titanium basket provided with the raw material mixture containing the at least one valuable containing tungsten.
13. The method for producing tungsten according to claim 2 , wherein the raw material mixture contains from 1 to 30% by mass of at least one valuable other than tungsten.
14. The method for producing tungsten according to claim 3 , wherein the raw material mixture contains from 1 to 30% by mass of at least one valuable other than tungsten.
15. The method for producing tungsten according to claim 4 , wherein the raw material mixture contains from 1 to 30% by mass of at least one valuable other than tungsten.
16. The method for producing tungsten according to claim 2 , wherein the electrolysis is carried out by adjusting a temperature of the electrolytic solution to 20 to 80° C.
17. The method for producing tungsten according to claim 3 , wherein the electrolysis is carried out by adjusting a temperature of the electrolytic solution to 20 to 80° C.
18. The method for producing tungsten according to claim 4 , wherein the electrolysis is carried out by adjusting a temperature of the electrolytic solution to 20 to 80° C.
19. The method for producing tungsten according to claim 5 , wherein the electrolysis is carried out by adjusting a temperature of the electrolytic solution to 20 to 80° C.
20. The method for producing tungsten according to claim 6 , wherein the electrolysis is carried out by adjusting a temperature of the electrolytic solution to 20 to 80° C.