Thermodynamic evaluation of the aqueous stability of rare earth elements in sulfuric acid leaching of monazite through pourbaix diagram

Yahya, Fatin Nasuha and Mat Suli, Liyana Nadirah and Wan Ibrahim, W. H. and Abdul Rasid, Ruwaida (2019) Thermodynamic evaluation of the aqueous stability of rare earth elements in sulfuric acid leaching of monazite through pourbaix diagram. In: Materials Today: Proceedings; 2018 International Conference on Chemical Sciences and Engineering: Advance and New Materials, ICCSE 2018 , 7 - 8 November 2018 , Melaka. 1647 -1656., 19 (157391). ISSN 2214-7853

Preview

Pdf
Thermodynamic evaluation of the aqueous stability of rare earth elements .pdf
Download (137kB) | Preview

Pdf
Thermodynamic evaluation of the aqueous stability of rare earth elements_FULL.pdf
Restricted to Repository staff only
Download (2MB) | Request a copy

DOI/Official URL: https://doi.org/10.1016/j.matpr.2019.11.193

Abstract

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.

Item Type:	Conference or Workshop Item (Lecture)
Additional Information:	Indexed by Scopus
Uncontrolled Keywords:	Aqueous stability; Monazite; Pourbaix diagram; Sulfuric acid leaching
Subjects:	Q Science > QD Chemistry T Technology > TP Chemical technology
Faculty/Division:	Institute of Postgraduate Studies Faculty of Chemical and Process Engineering Technology
Depositing User:	Mrs Norsaini Abdul Samat
Date Deposited:	10 Jan 2023 04:00
Last Modified:	10 Jan 2023 04:00
URI:	http://umpir.ump.edu.my/id/eprint/36671
Download Statistic:	View Download Statistics

Actions (login required)

View Item