scholarly journals Rare earth element extraction from pretreated bastnäsite in supercritical carbon dioxide

2017 ◽  
Vol 124 ◽  
pp. 20-29 ◽  
Author(s):  
L.K. Sinclair ◽  
D.L. Baek ◽  
J. Thompson ◽  
J.W. Tester ◽  
R.V. Fox
Keyword(s):  
Carbon Dioxide ◽  
Rare Earth ◽  
Supercritical Carbon Dioxide ◽  
Rare Earth Element ◽  
Earth Element ◽  
Supercritical Carbon

scholarly journals Extraction of Rare Earth Oxides Using Supercritical Carbon Dioxide Modified with Tri-n-Butyl Phosphate–Nitric Acid Adducts

2016 ◽  
Vol 55 (26) ◽  
pp. 7154-7163 ◽  
Author(s):  
Donna L. Baek ◽  
Robert V. Fox ◽  
Mary E. Case ◽  
Laura K. Sinclair ◽  
Alex B. Schmidt ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Rare Earth ◽  
Nitric Acid ◽  
Supercritical Carbon Dioxide ◽  
Rare Earth Oxides ◽  
Supercritical Carbon

scholarly journals Application of Green Solvents for Rare Earth Element Recovery from Aluminate Phosphors

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 287
Author(s):  
Clive H. Yen ◽  
Rui Cheong
Keyword(s):  
Carbon Dioxide ◽  
Rare Earth ◽  
Supercritical Carbon Dioxide ◽  
Acid Leaching ◽  
Magnesium Aluminate ◽  
Green Solvents ◽  
Strontium Aluminate ◽  
Acid Complex ◽  
Aluminate Phosphor ◽  
Supercritical Carbon

Two processes applying green solvents for recovering rare earth elements (REEs) from different types of aluminate phosphors are demonstrated in this report. For magnesium aluminate-type phosphors, a pretreatment with peroxide calcination was implemented first, and then followed by a supercritical fluid extraction (SFE) process. Supercritical carbon dioxide (sc-CO2) provides an effective and green medium for extracting REEs from dry materials. With the addition of a complex agent, tri-n-butyl phosphate-nitric acid complex, highly efficient and selective extraction of REEs using supercritical carbon dioxide can be achieved. The highest extraction efficiency was 92% for europium from the europium doped barium magnesium aluminate phosphor (BAM), whereas the highest extraction selectivity was more than 99% for the REEs combined from the trichromatic phosphor. On the other hand, for strontium aluminate type phosphors, a direct acid leaching process is suggested. It was found out that acetic acid, which is considerably green, could have high recovery rate for dysprosium (>99%) and europium (~83%) from this strontium aluminate phosphor materials. Nevertheless, both green processes showed promising results and could have high potential for industrial applications.

Sign in / Sign up

Export Citation Format

Share Document