Claims
- 1. A process for producing a high-purity Mn material comprising the steps of premelting an electrolytic Mn at 1250-1500° C. in an inert gas atmosphere over a holding time of at least one hour, and then vacuum distilling the resulting melt at 1100-1500° C.
- 2. A process according to claim 1, wherein the degree of vacuum during the vacuum distillation ranges from 5×10−6 torr to 10 torrs.
- 3. A process according to claim 1, wherein a crucible for use in the vacuum distillation is a double crucible, which comprises of an inner crucible, an outer crucible, and a carbon felt packed in the space therebetween.
- 4. The process according to claim 2, wherein a crucible for use in the vacuum distillation is a double crucible, which comprises an inner crucible, an outer crucible, and a carbon felt packed in the space therebetween.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-332287 |
Nov 1997 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATION
This application is a divisional of co-pending U.S. application Ser. No. 09/191,994, filed Nov. 13, 1998.
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A |
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Mar 1961 |
A |
3024106 |
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Mar 1962 |
A |
3926623 |
Keyser et al. |
Dec 1975 |
A |
Non-Patent Literature Citations (1)
Entry |
“ASM Handbook; Formerly Tenth Edition, Metals Handbook”, vol. 2, ASM International Handbook Committee, Oct. 1990, pp. 1135-1138. |