EJMP&EP


Review paper


Rare earths: the unseen metals

R.R. Moskalyk*

Nordic Metallurgical Consultants Inc., Sudbury, Ontario, P3E 5Y7, Canada


Received 21 April 2003; accepted 20 June 2003




ABSTRACT

High profile and primary commodities such as copper, zinc and others share the global limelight with respect to mining, industrial processes, and numerous end products for household and commercial markets. Apart from base metals, noble metals enjoy stock market notoriety and media attention. In contrast, rare earths furtively experience a plethora of residential, institutional, and industrial applications. The relatively abundant metallic elements commonly known as the “rare earths” present a low key image worldwide. The group is normally comprised of 15 lanthanides of which cerium is the most abundant plus scandium, thorium, and yttrium. The main host minerals consist of bastnäsite, monazite, and xenotime. Other sources include allanite and spent heavy mineral sands from uranium processing operations such as in Australia. Countries such as China and the United States are the largest producers of rare earth materials while over 30 other countries both contribute smaller quantities for worldwide consumption and generate commercial products. Global reserves of rare earth elements are dominated by China (43 %), the CIS (19 %), and the United States (13 %). The People’s Republic of China accounted for the majority of the world’s annual production of raw rare earths in the year 2002. The perceived “rare metals” have a strategic importance while being well suited to electronic and other diverse end uses. The supply and demand of rare earth products during the past decades have been relatively steady and subject to fluctuations in delivered price. As a condensation of the state-of-the-art in this fascinating industry, the paper serves to highlight the properties, sources, and recovery of these forgotten metals which find use in numerous unseen applications. It is intended to apprise the reader of the salient facts of these useful metallic elements that globally go unnoticed since they are overshadowed by the popularity and grandeur of precious metals such as gold and platinum.


Keywords: Extractive metallurgy; Production; Properties; Rare earths



* Corresponding author
   E-mail : raymoskalyk@yahoo.ca