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Geology and ESG Research Analysis

 

           

 

Metals are part of our modern lives and we must think sustainability through a process: Extraction-Integration-Recycling.

Lanthanum

Name

Lanthanum

Symbol

La

Atomic number

57

Group

LREE (light Rare Earth Elements)

Subgroup

cerium subgroup

Occurrence / Extraction

Monazite (Ce, La, Th, Nd, Y)PO4, and bastnäsite (Ce, La, Y)CO3F.

Extraction: ore treated with sulfuric acid (H2SO4). The materials produced are then passed through a series of steps and the individual elements separated from each other.

Use

Lanthanum-rich lanthanide compounds have been used extensively for cracking reactions in FCC catalysts, especially to manufacture high-octane gasoline from heavy crude oil.

Lanthanum-Rich Rare Earth metals play the important roles in hydrogen storage batteries.

Lanthanide zirconates are used for their catalytic and conductivity properties and lanthanum stabilized zirconia has useful electronic and mechanical properties.

 Lanthanum carbonate was approved as a medication (Fosrenol, Shire Pharmaceuticals) to absorb excess phosphate in cases of end-stage renal failure. Some rare-earth chlorides, such as lanthanum chloride (LaCl3), are known to have anticoagulant properties.

Properties

Lanthanum is a soft, malleable, ductile, silver-white metal. It is chemically active, it is one of the most reactive of the rare-earth metals: it oxidizes rapidly in air and it reacts with water to form the hydroxide. Lanthanum is easily ignited, its salts are often very insoluble.

Atomic mass: 138.91 g.mol -1
 Electronegativity according to Pauling:  1.1
 Density:  6.18 g.cm-3 at 20°C
 Melting point:  920 °C
 Boiling point:  3454 °C
 
The origin of the name comes from the Greek word lanthanein meaning to lie hidden.

Relative abundance

Lanthanum is relatively common in the Earth's crust. Its abundance is thought to be as high as 18 parts per million. After cerium, it is the second most abundant of the rare earths. That would make it nearly as common as copper or zinc.

atomic mass (g.mol -1)

138.91

density (g/cm3)

6.18

Oxydation number

+3

Melting point (°C)

920

Boiling point (°C)

3454

Magnetic moment

 

Abundance in the Earth's crust ( ppm)

18

discovery

Carl Mosander in 1839