Significance of REE

Rare earth metals (REM) and rare earth elements (REE) are the collection of 17 earth elements in the periodic table, namely scandium, yttrium, and 15 lanthanides. Because of their unique magnetic, fluorescent and chemical properties, REM and REE are key materials used in science innovation.

Major rare earth applications are used in hybrid vehicles. For example the Toyota Prius,  contains 30 kg (65 lb) of REE. Rare earth elements are used in motors, metal hydride batteries, glass, autocatalysts, and electronics.

There are 15 accepted rare earth elements known as the lanthanides with atomic numbers 57 to 71 and are listed as follows: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.

                  

Promethium is a synthetic element which does not occur naturally is not generally included as a commodty. Yttrium is considered a rare earth since it tends to occur in the same ore deposits as the lanthanides and exhibits similar chemical properties.

It has been the practice to report rare elements as a percentage oxide. The elements are initially reported from the lab in parts per million. The elements are converted to oxides with the following molecular formulas, La₂O₃, _Ce2O₃, Pr₂O₃, Nd₂O₃, Sm₂O₃, Eu₂O₃, Gd₂O₃, Tb₂O₃, Dy₂O₃, Ho₂O₃, Er₂O₃, Tm₂O₃, Yb₂O₃, Lu₂O₃, and Y2O3. Rare earth oxides are reported as total rare earth oxides (TREO) which is a simple addition of the percentages of the above 15 components.

Rare earth oxides are further classified as light rare earth oxides (LREO) which includes La₂O₃, _Ce2O₃, Pr₂O₃, Nd₂O₃ and Sm₂O₃, and heavy rare oxides (HREO) which includes Eu₂O₃, Gd₂O₃, Tb₂O₃, Dy₂O₃, Ho₂O₃, Er₂O₃, Tm₂O₃, Yb₂O₃, Lu₂O₃, and Y2O3.

As a rough measure of the value of an assay, heavy rare earth elements (HREO) are reported as a percentage of total rare earth oxides (TREO). In the coming years heavy rare earth elements will be more sought after since China, the world’s leading producer of rare earths, has indicated it will be curtailing exports in order to meet and secure their domestic needs. The short fall in production from other countries in the world will lead to an upward pressure on commodity prices.


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