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Coltan


Coltan
is the industrial name for columbite–tantalite, a dull black metallic mineral from which the elements niobium (formerly "columbium") and tantalum are extracted. The niobium-dominant mineral is columbite, hence the "col" half of the term. The mineral concentrates dominated by tantalum are referred to as tantalite.

 

Physical Coltan Properties

Coltan - Specifications


Producer of  Coltan
Location  W W
Geology type  Tertiary age Coltan measures 
Mineral type  Tantalite
Mining method  Button
Analysis (Sector 1)
Composition
Refined TA
SiO2
1.50

Tantalum

 

TiO2
36.78
Al2O3
1.38
Fe2O3
10.71
MnO
0.80
P2O5
0.09
SO3
-
ZrO2
0.27
PbO
0.21
Sc2O3
<0.1
Y2O3
<0.1
HfO2
<0.1
Ta2O5
26.31
Nb2O5
7.82
SnO2
12.95
WO3
0.61
ThO2
<0.1
U
<0.1
LOl
-
Properties: Tantalum is a heavy, hard gray metal. Pure tantalum is ductile and may be drawn into very fine wire. Tantalum is practically immune to chemical attack at temperatures lower than 150 °C. It is only attacked by hydrofluoric acid, acidic solutions of the fluoride ion, and free sulfur trioxide. Alkalis attack tantalum very slowly. At higher temperatures, tantalum is more reactive. The melting point of tantalum is very high, exceeded only by that of tungsten and rhenium. The melting point of tantalum is 2996 °C; boiling point is 5425 +/- 100 °C; specific gravity is 16.654; valence is usually 5, but may be 2, 3, or 4.

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