Separation of thorium(IV) and extracting rare earths from sulfuric and phosphoric acid solutions by solvent extraction method

被引：61
作者：
Li, DQ [1 ]
Zuo, Y [1 ]
Meng, SL [1 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Appl Chem, Key Lab Rare Earth Chem & Phys, Changchun 130022, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 374卷 / 1-2期
关键词：
N-1923; P-507; Th; RE; solvent extraction;
D O I：
10.1016/j.jallcom.2003.11.055
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The bastnasite of Baotou (China) was roasted in concentrated sulfuric acid at 250-300 degreesC and the calcined products were leached by water. Almost all rare earths (RE) were moved into solutions in trivalent along with some radioactive impurity thorium(IV) (Th(IV))which accounts for 0.4% of RE and other impurities such as Fe(III), Ca, F, P, etc. Through fractional extraction (seven stages for extraction and nine for scrubbing), the mass ratio of Th(IV) and RE (ThO2/REO) in solution has decreased to 5 x 10(-6). The purity of ThO2 product recovered from organic phase is above 99%. The iron(III) in solutions can be removed in the form of precipitation by adding some magnesia into the solutions. Then RE can be concentrated by solvent extraction with 2-ethylhexyl phosphinic acid 2-ethylhexylester (P-507). The results of fractional extraction show that the concentration of total RE in aqueous solutions stripped by hydrochloric acid is over 200 g REO/I with the yield of RE above 99%. Individual RE can be attained by solvent extraction with P507 in the following process. (C) 2003 Elsevier B.V. All rights reserved.
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页码：431 / 433
页数：3
相关论文
共 9 条
[1]  
Li DQ., 1984, NUCL CHEM RADIO CHEM, V6, P153
[2]  
LI DQ, 1983, CHIN J APPL CHEM, V1, P47
[3]  
LI DQ, 1998, Patent No. 981223486
[4]  
LI DQ, 1987, COLUMN RARE EARTH CH, P182
[5]  
LI DQ, 1980, ISEC 80, V3, P80
[6]  
Lu J, 1998, HYDROMETALLURGY, V50, P77
[7]  
XU GX, 1995, RARE EARTHS, V1, P409
[8]  
XU GX, 1995, RARE EARTHS, V1, P399
[9]  
XU GX, 1995, RARE EARTHS, V1, P1
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