| Project/Area Number |
07555533
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
Metal making engineering
|
|---|
| Research Institution | Muroran Institute of Technology |
|---|
Principal Investigator |
SHIMAKAGE Kazuyoshi Muroran Institute of Technology, Faculty of Eng, Professor, 工学部, 教授 (70005346)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
UEJOU Satoru Japan Energy Ltd.Senior Researcher, 総合技術本部, 主任研究員
HIRAI Shinji Muroran Institute of Technology Faculty of Eng, Associte Protessor, 工学部, 助教授 (10208796)
|
|---|
| Project Period (FY) |
1995 – 1997
|
| Project Status |
Completed (Fiscal Year 1997)
|
| Budget Amount *help |
¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1996: ¥3,700,000 (Direct Cost: ¥3,700,000)
|
|---|
| Keywords | Crude Niobium / High Purity Niobium / Fluoride Bath / Molten Salt Electrolysis / Electron Beam Melting / Purification / Production Process / Electron Accerator / 粒子加速器 / 製造 |
|---|
| Research Abstract |
Crude niobium has been purified by a refining process consistiong of molten salt electrolysis and electron beam melting for materials of electron particle accelerator. The molten salt electronrefining was carried out galvanostatically using a FLINAK bath (26.3 mass% Lif-10.5 mass%NaF-47.0 mass%KF-16.2 mass%K_2NbF_7 at 963 K under Ar atmosphere. After the molten salt electronrefining and the electron beam melting, the contents of metallic impurity components in the purified niobium were determined by ICP emission spectrography analysis. Refractory metals such as tantalum, tungsten and molybdenum in crude niobium could be eliminated by means of molten salt electrorefining. Especially, the molten salt electrorefining method using fluoride bath was remarkably effective for the removal of merallic tantalum in crude niobium. Nonmetallic impurity components such as oxygen and nitrogen could be also remove by electron beam melting.
Crude niobium of 99.8 mass% purity was found to be to 99.99 mass% by this process.
|
