HYDROGEN AS A RETAINING ION FOR RARE-EARTH SEPARATION BY ION EXCHANGE WITH EDTA AND DCTA
Technical Report
·
OSTI ID:4738292
Effective separation of rare-earth mixtures was obtained using hydrogen as a retaining ion at 200 deg F with ethylenediaminetetraacetic acid (EDTA) eluant. Results obtained in Bureau of Mines bench-scale apparatus and large columns with hydrogen as a retaining ion closely parallel those obtained with copper as a retaining ion. The use of hydrogen as a retaining ion permits EDTA and water, collected before rare-earth breakthrough, to be recovered in a form that allows the material to be recycled without extensive processing. With the exception of yttrium and dysprosium, separation of rare-earth mixtures was improved and throughput is increased by elevated temperatures. Separation with 1,2-diaminocyclohexanetetraacetic acid (DCTA) eluant increased markedly on increasing temperature from ambient to 250 deg F; however on the basis of separation efficiency, DCTA does not compare favorably with EDTA. (auth)
- Research Organization:
- Bureau of Mines. Reno Metallurgical Research Center, Nev.
- NSA Number:
- NSA-17-008231
- OSTI ID:
- 4738292
- Report Number(s):
- BM-RI-6131
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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