 Cobalt is a hard, lustrous, gray metal, a chemical element with symbol Co and atomic number 27. Although cobalt-based colors and pigments have been used since ancient times for making jewelry and paints, and miners have long used the name kobold ore for some minerals, the free metallic cobalt was not prepared and discovered until 1735 by Georg Brandt.
Cobalt is used in the preparation of magnetic, wear-resistant, and high-strength alloys. Cobalt blue gives a distinctive deep blue color to glass, ceramics, inks, paints, and varnishes. Cobalt-60 is a commercially important radioisotope, used as a tracer and in the production of gamma rays for industrial use.
Cobalt is an essential trace element for all multicellular organisms as the active center of coenzymes called cobalamins. These include vitamin B-12 which is essential for mammals. Cobalt is also an active nutrient for bacteria, algae, and fungi, and may be a necessary nutrient for all life.
|
Grade |
F.s.s.s(um) |
Oxygen% Max. |
Cobalt% |
Scott density g/in3 |
|
Type A |
Type B |
|
Co06 |
0.6-0.9 |
0.6 |
≥99.8 |
7-9 |
8-11 |
|
Co12 |
1.0-1.4 |
0.5 |
≥99.8 |
8-10 |
11-13 |
|
Co25 |
2.0-3.0 |
0.4 |
≥99.8 |
9-13 |
13-15 |
Trace elements for cobalt powder:
|
Element |
Max. % |
Typical % |
|
C |
0.03 |
0.02 |
|
Ca |
0.02 |
0.005 |
|
Cu |
0.01 |
0.005 |
|
Fe |
0.03 |
0.008 |
|
Mg |
0.01 |
0.002 |
|
Mn |
0.01 |
0.001 |
|
Na |
0.02 |
0.005 |
|
Ni |
0.02 |
0.01 |
|
S |
0.005 |
0.0005 |
|
Si |
0.01 |
0.002 |
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