JPS56155016A - Preparation of alumina having extremely low content of radioactive element - Google Patents
Preparation of alumina having extremely low content of radioactive elementInfo
- Publication number
- JPS56155016A JPS56155016A JP5706380A JP5706380A JPS56155016A JP S56155016 A JPS56155016 A JP S56155016A JP 5706380 A JP5706380 A JP 5706380A JP 5706380 A JP5706380 A JP 5706380A JP S56155016 A JPS56155016 A JP S56155016A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- preparation
- extremely low
- low content
- radioactive elements
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
PURPOSE: To enable easily the preparation of alumina having extremely low content of radioactive elements, by blending alumina with aluminum fluoride, boric acid and silicic acid, followed by calcination.
CONSTITUTION: Since a very small amount of radioactive elements, e.g., uranium, thorium, etc. exists in alumina prepared by Bayer's process using bauxite as a raw material, it can not be used as a package for semiconductor memory, etc. 0.2W 7wt% calculated as SiO2 of silicic acid-containing substance, e.g., chamotte, etc. and 0.25W1.0wt% aluminum fluoride or boric acid or both are added to the alumna, which is calcined at 1,350W1,450°C, and the additive, e.g., chamotte, etc. is separated and removed from the alumina. The radioactive elements, e.g., uranium, thorium, etc. are adsorbed on the silicic acid and fixed so that their content in the alumina is extremely reduced.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5706380A JPS5844610B2 (en) | 1980-05-01 | 1980-05-01 | Method for producing alumina with extremely low content of radioactive elements |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5706380A JPS5844610B2 (en) | 1980-05-01 | 1980-05-01 | Method for producing alumina with extremely low content of radioactive elements |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56155016A true JPS56155016A (en) | 1981-12-01 |
JPS5844610B2 JPS5844610B2 (en) | 1983-10-04 |
Family
ID=13044976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5706380A Expired JPS5844610B2 (en) | 1980-05-01 | 1980-05-01 | Method for producing alumina with extremely low content of radioactive elements |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5844610B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05294613A (en) * | 1991-11-28 | 1993-11-09 | Showa Denko Kk | Spherical corundum particle |
CN115947361A (en) * | 2022-11-21 | 2023-04-11 | 江苏联瑞新材料股份有限公司 | Low-radioactivity alumina powder and preparation method thereof |
-
1980
- 1980-05-01 JP JP5706380A patent/JPS5844610B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05294613A (en) * | 1991-11-28 | 1993-11-09 | Showa Denko Kk | Spherical corundum particle |
CN115947361A (en) * | 2022-11-21 | 2023-04-11 | 江苏联瑞新材料股份有限公司 | Low-radioactivity alumina powder and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
JPS5844610B2 (en) | 1983-10-04 |
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