Characteristics of rare-earth elements extraction from tholeiitic basalt by hydrochloric acid nitric acid mixture - Polymorphic effect of sesquioxides of lanthanides

被引：1
|
作者：
Masuda, A
机构：
[1] Chinese Acad Sci, Inst Geochem, Guiyang 550002, Guizhou, Peoples R China
[2] Univ Tokyo, Fac Sci, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan
来源：
PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES | 1999年 / 75卷 / 03期
关键词：
polymorphism; REE; extraction; tholeiitic basalt; hydrochloric acid nitric acid mixture; crystal structure; sesquioxide; valency;
D O I：
10.2183/pjab.75.46
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The interesting features that rare-earth elements (REE) exhibit in HCl-HNO3 acid extraction from powdered tholeiitic basalt are reported here. Cerium which can be oxidized to tetravalent shows the highest extraction percentage. The lower extractability of Eu compared with Sm and Gd is attributed to the high chemical resistance of feldspar in which divalent Eu is preferentially incorporated Based on the extractability, the stable trivalent rare-earth elements, La, Nd, Sm, Gd, Dy, Er, Yb and Lu are divided into three subgroups; {La, Nd}, {Sm}, and {Gd, Dy, Er, Yb, Lu}. This differentiation of the stable trivalent REE is inferred to be related to the polymorphic crystal structures of A-, B- and C-type sesquioxides of REE. Barium shows an extractability identical with that of La-Nd subgroup.
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收藏
页码：46 / 48
页数：3
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