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Extraction of selected rare earth elements from anthracite acid mine drainage using supercritical CO2 via coagulation and complexation

引用

Journal of Rare Earths 2021年第1期39卷 83-89,I0004页

作者： Guanrong Song Xingchao Wang Carlos Romero Huazhi Chen Zheng Yao alfred kaziunas Rolf Schlake Madhu Anand Tom Lowe Greg Driscoll Boyd Kreglow Harold Schobert Jonas Baltrusaitis Energy Research Center Lehigh University117 ATLSS Dr.BethlehemPA18015USA Applied Separations Inc. 930 Hamilton StreetAllentownPA18101USA Blaschak Coal Corporation 1166 W Centre StMahanoy CityPA17948USA Department of Chemical and Biomolecular Engineering Lehigh University111 Research Dr.Bethlehem.PA.18015USA

Rare earth elements(REEs)are valuable raw materials which are in great demand in modern high technology *** methods to produce/recover REEs from waste is significant to the national security of any developed *** study was focused on investigating the use of supercritical CO2(sCO2)to extract REEs from anthracite acid mine drainage(AMD).Four different mine drainage water source locations at Blaschak Coal *** Pennsylvania,USA were selected for sample *** extraction process was developed and demonstrated for two of those water sources containing the highest concentration of REEs.A method involving metal ion coagulation,their dissolution from the sludge into a concentrated aqueous HNO3 solution,complexation with organic ligands and sCO2 extraction was developed to recover REEs from ***,sodium aluminate(NaAlO2)was used as the coagulant to concentrate REEs from the AMD into a solid ***,over 99%of the REEs in AMD is concentrated in the remaining *** the coagulation process,the effects of pH and NaAlO2 concentration on REE precipitation were *** nitric acid(HNO3)was used to digest the pre-concentrated sludge and tributyl phosphate(TBP)was used to form REE/TBP/HNO3,a non-polar complex with selected REEs,specifically,cerium(Ce),lanthanum(La)and neodymium(Nd).HNO3 concentration and organic/aqueous phase ratio were considered as the variables to improve complexation *** extraction experiments using sCO2 and REE/TBP/HNO3 solutions were then conducted at optimal conditions of 60℃and 20 *** overall REE extraction efficiencies are found to increase with the atomic number of the *** a result,the average overall REE extraction efficiencies of 41.8%,40.1%and 58.2%for Ce,La and Nd,respectively,are *** potential improvements in the overall extraction efficiency are also discussed.

关键词： Supercritical CO2 extraction Rare earth elements Acid mine drainage

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