LIQUID-LIQUID-EXTRACTION OF CERIUM(III) AND LANTHANUM(III) FROM AQUEOUS CHLORIDE SOLUTIONS BY SME-529

被引：10
|
作者：
URBANSKI, TS [1 ]
ABBRUZZESE, C [1 ]
FORNARI, P [1 ]
MASSIDDA, R [1 ]
机构：
[1] CNR,INST MINERAL PROC,I-00138 ROME,ITALY
来源：
HYDROMETALLURGY | 1992年 / 28卷 / 01期
关键词：
D O I：
10.1016/0304-386X(92)90061-4
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The extraction of cerium (III) and lanthanum (III) from aqueous chloride solutions by SME 529 dissolved in n-heptane was studied as a function of pH, extractant, metal and chloride concentrations. The extraction equilibrium for both lanthanides was found to depend strongly on pH and SME 529 concentration. The calculated extraction constants are: log K(ex) = -16.3 for Ce(III) and log K(ex) = -19.5 for La (III). Large extraction coefficient values can be achieved only at relatively high pH values when partial precipitation of hydroxide occurs. CeR3 and LaR2OH are the main species extracted.
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页码：1 / 12
页数：12
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