A solution chemistry approach to the study of rare earth element precipitation by oxalic acid

被引：120

作者：

Chi, R ^{[1
]}

Xu, Z

机构：

[1] Tsing Hua Univ, Inst Nucl Energy Technol, Beijing 102201, Peoples R China

[2] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 1999年 / 30卷 / 02期

关键词：

Oxalate; Material Transaction; Oxalic Acid; Solution Chemistry; Weathered Clay;

D O I：

10.1007/s11663-999-0047-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A solution chemistry approach is developed to study oxalic acid efficiency (OAE) in recovering rare earth (RE) elements from the leachates of weathered clays. The optimal pH for precipitation (approximately 2) to obtain the highest RE recovery with the highest purity is identified experimentally and confirmed by solution chemistry calculations. Applying the solution chemistry approach to three case studies, the cause for a larger oxalic acid consumption than that calculated from stoichiometry of RE oxalate precipitation is identified. A typical OAE of approximately 60 pct was determined with 40 pct of excess oxalic acid consumed by precipitating and complexing non-RE elements while maintaining a low residual RE element concentration. Both solution chemistry calculations and experimental results showed that OAE can be improved by processing leachates of high initial RE concentrations.

引用

页码：189 / 195

页数：7

共 8 条

[1]

CHI R, 1989, RARE EARTHS EXTRACTI, P269

[2]

CHI R, 1996, BENEFICIATION RARE E, P196

[3]

Chi RA, 1995, T NONFERR METAL SOC, V5, P36

[4]

DUDDY LR, 1988, CHEM GEOL, V30, P363

[5]

LAUFER F, 1984, CLAY MINER, V19, P134

[6]

Martell A. E., 1976, Critical Stability Constants

[7] MOBILITY AND FRACTIONATION OF RARE-EARTH ELEMENTS DURING WEATHERING OF A GRANODIORITE [J].

NESBITT, HW .

NATURE, 1979, 279 (5710) :206-210

[8]

1985, CRC HDB CHEM PHYSICS

← 1 →