Listing Description:
Chromite is an iron chromium oxide:
FeCr2O4. It is an oxide mineral belonging to the spinel group. Magnesium can substitute for iron in
variable amounts as it forms a solid solution with magnesiochromite (MgCr2O4);[5] substitution of aluminium occurs leading to hercynite(FeAl2O4).
Detailed Description:
It is by far the most industrially important
mineral for the production of metallic chromium, used as an alloying ingredient
in stainless and tool steels.
Uses
The only ores of chromium are the minerals chromite and
magnesiochromite. Most of the time, economic geology names chromite the whole
chromite-magnesiochromite series: FeCr2O4, (Fe,Mg)Cr2O4,
(Mg,Fe)Cr2O4 and MgCr2O4.[4] The two main products of
chromite refining are ferrochromium and
metallic chromium; for those products the ore smelter process differs
considerably. For the production of ferrochromium the chromite ore (FeCr2O4)
is reduced with either aluminium or silicon in an aluminothermic
reaction and for the production of pure chromium the iron has
to be separated from the chromium in a two step roasting and leaching process.[9] Chromite is also used as
a refractory material, because it has a
high heat stability.[10]
The chromium extracted from chromite is used in chrome plating and alloying for
production of corrosion resistant superalloys, nichrome, and stainless steel. Chromium is used as a pigment
for glass, glazes, and paint, and as an oxidizing agent for tanning leather.[11] It is also sometimes used as a
gemstone.
PRICE
$2.43/KG
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