A novel process for recovering rare earth from weathered black earth

被引：32

作者：

Chi, R ^{[1
]}

Zhu, G

Zhou, Z

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 | 2000年 / 31卷 / 01期

基金：

加拿大自然科学与工程研究理事会; 中国国家自然科学基金;

关键词：

Material Transaction; Ammonium Chloride; Earth Ratio; Reduction Leaching; Roasted Material;

D O I：

10.1007/s11663-000-0144-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A novel process for recovering rare-earth (RE) elements from weathered-black-earth slime is developed. This process involves the initial removal of Mn by reduction leaching using SO(2) followed by ammonium chloride roasting of the residual solids from the leaching process. The controlled roasting selectively converts RE oxides to water-soluble RE chlorides. The roasted materials are then dispersed in warm water (75 degrees C) to extract RE, while water-insoluble iron oxides remain in gangue sludge, minimizing iron impurities in final RE products and hence simplifying the purification process. Lead-chloride precipitates are obtained by cooling the leachate to -10 degrees C, and RE is recovered using oxalic acid precipitation. With this new process, a product of 92 pct purity at a RE recovery greater than 65 pct is obtained. In addition, Mn and Pb are recovered as by-products, with a recovery of 64 and 54 pct, respectively. The effect of operating variables on RE recovery is examined and the process chemistry described.

引用

页码：191 / 196

页数：6

共 11 条

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