A kinetic study of the leaching of a low-grade niobium-tantalum ore by concentrated KOH solution

被引：63

作者：

Zhou, HM ^{[1
]}

Zheng, SL

Zhang, Y

Yi, DQ

机构：

[1] Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China

[2] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

来源：

HYDROMETALLURGY | 2005年 / 80卷 / 03期

基金：

中国国家自然科学基金;

关键词：

clean process; leaching; kinetics; KOH; niobium-tantalum ore; diffusion control;

D O I：

10.1016/j.hydromet.2005.06.011

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A kinetic study of the leaching of a low-grade niobium-tantalum ore by concentrated KOH solution under atmospheric pressure has been investigated. The effects of reaction temperature, KOH concentration, agitation speed, particle size and alkalito-ore mass ratio on the dissolution rate of niobium were examined. It was found that the dissolution rate of niobium is significantly influenced by the temperature, particle size and concentration of KOH solution. The experimental data were well interpreted with a shrinking core model under diffusion control through the product layer. By using the Arrhenius expression, the apparent activation energy for the dissolution of niobium was evaluated. Finally, on the basis of the shrinking core model, the following rate equation was established: 1 - 3(1 - X-b)(2/3) + 2 (1 - X-b) = k(0)/R-2 e(-72200/RT)t. (c) 2005 Elsevier B.V All rights reserved.

引用

页码：170 / 178

页数：9

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