A review on the cracking,baking and leaching processes of rare earth element concentrates

Rare earth elements（REE） are a set of seventeen chemical elements in the periodic table, which have been found in a variety classes of minerals in the world. The global demand for REE and their compounds has increased in high-tech applications over the past decades due to their chemical, catalytic,...

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Bibliographic Details
Published inJournal of rare earths Vol. 35; no. 8; pp. 739 - 752
Main Authors Sadri, Farzaneh, Nazari, Amir Mohammad, Ghahreman, Ahmad
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2017
Subjects
acid baking
alkaline cracking
leaching
rare earth elements
separation
化学元素
弱酸溶液
焙烧工艺
碱裂解
稀土元素
稀土化合物
稀土精矿
综述
alkaline cracking
acid baking
leaching
separation
rare earth elements
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Summary:Rare earth elements（REE） are a set of seventeen chemical elements in the periodic table, which have been found in a variety classes of minerals in the world. The global demand for REE and their compounds has increased in high-tech applications over the past decades due to their chemical, catalytic, electrical, magnetic, and optical properties. After mining, comminution and ore beneficiation, hydrometallurgical and pyrometallurgical processes are carried out to recover REE compounds. The concentrate cracking is a process wherein the structure of a REE mineral is modified in order to dissolve REE in a weak acid solution. This would be accomplished through various techniques such as alkaline cracking and acid baking. The cracked concentrate is then leached to dissolve REE in a solution and subsequently recover those via neutralization, precipitation or solvent extraction methods. This paper reviewed the cracking and leaching methods applied to REE concentrates to produce an intermediate product for further REE separation.
Bibliography:rare earth elements;alkaline cracking;acid baking;leaching;separation
11-2788/TF
Rare earth elements（REE） are a set of seventeen chemical elements in the periodic table, which have been found in a variety classes of minerals in the world. The global demand for REE and their compounds has increased in high-tech applications over the past decades due to their chemical, catalytic, electrical, magnetic, and optical properties. After mining, comminution and ore beneficiation, hydrometallurgical and pyrometallurgical processes are carried out to recover REE compounds. The concentrate cracking is a process wherein the structure of a REE mineral is modified in order to dissolve REE in a weak acid solution. This would be accomplished through various techniques such as alkaline cracking and acid baking. The cracked concentrate is then leached to dissolve REE in a solution and subsequently recover those via neutralization, precipitation or solvent extraction methods. This paper reviewed the cracking and leaching methods applied to REE concentrates to produce an intermediate product for further REE separation.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(17)60971-2