Thermodynamic Evaluation of the Aqueous Stability of Rare Earth Elements in Sulfuric Acid Leaching of Monazite through Pourbaix Diagram

被引：0

作者：

Yahya, Fatin Nasuha ^{[1
,2
]}

Suli, Liyana Nadirah Mat ^{[1
,2
]}

Ibrahim, Wan Hanisah Wan ^{[1
,2
]}

Rasid, Ruwaida Abdul ^{[1
]}

机构：

[1] Univ Malaysia Pahang, Fac Chem & Nat Resources Engn, Kuantan 26300, Pahang, Malaysia

[2] Univ Malaysia Pahang, RERC, Kuantan 26300, Pahang, Malaysia

来源：

MATERIALS TODAY-PROCEEDINGS | 2019年 / 19卷

关键词：

Pourbaix Diagram; Sulfuric Acid Leaching; Monazite; Aqueous Stability; DISSOLUTION; RECOVERY; THORIUM; SYSTEMS; TH; LA; PH; CE;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The objective of this study is to construct Pourbaix diagram (Eh-pH diagram) for Lanthanum (La), Cerium (Ce) and Neodymium (Nd) elements at elevated temperatures. The Pourbaix diagram is able to map the stability area of the aqueous system, which will be useful to determine the process conditions that favor dissolution and possible rare earth (RE) metals that may be present in the system. In this work the process condition is based on the sulfuric acid leaching of monazite concentrate and it is carried out using HSC Chemistry 8.0 software. Addition of the sulfate ions from the sulfuric acid as the leaching solvent, introduces soluble metal-sulfate complexes. With temperature increase, the stability of these complexes increases. This can be observed based on the increased area in the Eh-pH diagram. Comparing the 3 rare earth elements in this study, it was determined that at elevated temperatures the order of stability is Ce>Nd>La. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：1647 / 1656

页数：10