| Original document(21 pages) Authorized document(21 pages) 中文版 |
Basic soln. of raw sodium tungstate is adsorbed by porous ion-exchange resin with strong basicity and then the resin is desorbed by a mixed soln. of ammonium chloride and ammonium hydroxide. The soln. is then evaporated and secondary ammonium tungstate is cryslallized out. On the other hand, the remained mother liq. is adsorbed by weak acidity anion exchange resin which is then desorbed by sodium hydroxide soln. The desorption soln. is recycled as raw material. The invention process has advantages: short prodn. line, low cost, simple equipment and excellent prod. quality. |
Application Number
申请号 |
89101804 |
Application Date
申请日 |
1989.03.31 |
| Title 名称 |
Prepn. of pure seconderary ammonium tungstate by ion-exchange method |
Publication Number
公开号 |
1045958 |
Publication Date
公开日 |
1990.10.10 |
| Approval Pub. Date |
|
Granted Pub. Date |
1992.10.14 |
| International Classification 分类号 |
C01G41/00 |
Applicant(s) Name
申请人 |
Jilin Germanium Factory |
| Address 地址 |
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| Inventor(s) Name 发明人 |
Chen Changshi, Song Yulin |
| Attorney & Agent 代理人 |
MU ZONGXU |
| More information 更 多 信 息 |
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