Chromium is used in stainless steel, and other alloys. Chromium plating, for example on cars and bicycles, produces a smooth, silver finish that is highly resistant to corrosion. The metal is also widely used as a catalyst. Chromium compounds are valued as pigments for their vivid green, yellow, red and orange colors.
When inhaled, chromium compounds are respiratory tract irritants and can cause pulmonary sensitization. Chronic inhalation of Cr(VI) compounds increases the risk of lung, nasal, and sinus cancer. Severe dermatitis and usually painless skin ulcers can result from contact with Cr(VI) compounds.
Chromium is used in stainless steel, and other alloys. Chromium plating, for example on cars and bicycles, produces a smooth, silver finish that is highly resistant to corrosion. The metal is also widely used as a catalyst. Chromium compounds are valued as pigments for their vivid green, yellow, red and orange colors.
True chromite is common as inclusions in diamonds from kimberlites (South Africa and Yakutia). Members of the spinel group may be enriched Cr and V in marbles (Slyudyanka), massive sulphide ores (Outokumpu) and also in some types of meteorites.
Commonly known as chrome, it is one of the most important and indispensable industrial metals because of its hardness and resistance to corrosion. But it is used for more than the production of stainless steel and nonferrous alloys; it is also used to create pigments and chemicals used to process leather.
Chromium (Cr): Chromium is added to steel to increase resistance to oxidation. These are the Austenitic stainless steels, typified by 18-8 (304/1.4301), where the tendency of Nickel to form Austenite is responsible for a great toughness (impact strength) and high strength at both high and low temperatures.
Hand specimen identification of chromite requires a consideration of: color, specific gravity, luster, and a characteristic brown streak. The most important clue to identifying chromite is its association with ultrabasic igneous rocks and metamorphic rocks such as serpentinite. Chromite is sometimes slightly magnetic.
Bauxite is used in a lot of industries like the chemical industry, refractory, abrasive, cement, steel, and petrol industry amongst others. In chemical, bauxite along with alumina is used in the manufacturing of aluminium chemicals. In refractory, it is used as a raw material for making several products.
While the magma is slowly cooling inside the Earth's crust, chromite crsytals are forming and because of their density, fall to the bottom and are concentrated there. Although its primary origin is ultra-mafic rocks such as peridotites, chromite is also found in metamorphic rocks such as serpentites.
Chromite ore has a spinel structure with a general formula of (Fe,Mg)O. (Cr,Al,Fe)2O3. The content of Cr2O3 for metallurgical-grade chromite ore is in the range 42–55% and the chromium-to-iron ratio is higher than 1.5.
Chromium was discovered by Louis-Nicholas Vauquelin while experimenting with a material known as Siberian red lead, also known as the mineral crocoite (PbCrO4), in 1797. He produced chromium oxide (CrO3) by mixing crocoite with hydrochloric acid (HCl). Chromium forms many colorful compounds that have industrial uses.
| Chromite Production and Reserves |
|---|
| Country | 2011 Mine Production | Reserves |
|---|
| South Africa | 10,200 | 200,000 |
| Other Countries | 5,450 | NA |
| United States | 0 | 620 |
The only ore of chromium is the mineral chromite and 99 percent of the world's chromite is found in southern Africa and Zimbabwe. Geologists estimate that there are about 11 billion tons of mineable chromite ore in the world, enough to supply the current demand for hundreds of years.
Chromite Sand is a naturally occurring spinel consisting primarily of the oxides of chrome and iron. It is a by-product of ferro-chrome production and is mainly used in foundry applications and in glass production.
Chromite is sometimes slightly magnetic. This can cause it to be confused with magnetite. Chromite and ilmenite have very similar properties. Careful observations of hardness, streak, and specific gravity are required to distinguish these minerals in hand specimens.
The only ore of chromium is the mineral chromite and 99 percent of the world's chromite is found in southern Africa and Zimbabwe.
A naturally occurring material, nickel is mined in 23 countries around the world. Of these, some of the most important nickel mining places are located in Russia, Canada, Australia – such as Mincor, near Kambalda, Indonesia, China, South Africa and Columbia.
As nouns the difference between chromite and chromium
is that chromite is (mineral) a dark brown mineral species with the formula fecr2o4 while chromium is a metallic chemical element (symbol cr) with an atomic number of 24.4 Countries with the World's Highest Chromium Production
- South Africa. Mine production: 15 million MT.
- Kazakhstan. Mine production: 5.4 million MT.
- India. Mine production: 3.2 million MT.
- Turkey. Mine production: 2.8 million MT.
- 5 responses to “4 Countries with the World's Highest Chromium Production” Bill Horpyniuk says:
Chromium is found mainly in chromite. This ore is found in many places including South Africa, India, Kazakhstan and Turkey.
Noront and Freewest each discovered notable deposits of chromite as well. When U.S. iron ore and coal producer, Cliffs Natural Resources Inc heard of the promising area they purchased the company Freewest. By 2015 Cliffs expects to be producing 1 million to 2 million tonnes of high-grade chromite annually.
Ores. Although chromium occurs in many minerals, the only ore exploited commercially is chromite.
Sukinda is a town in Jajpur district, Odisha, India. Odisha accounts for about 98% of the total proved chromite (chromium ore) reserves of the country, of which about 97% occur in the Sukinda Valley.
Chromite contains Mg, ferric iron [Fe(III)], Al and trace amounts of Ti. Chromite can change into different minerals based on the amounts of each element in the mineral.
Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr2O4). It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity.
Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr2O4). It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity.
Crystal structure
Galena belongs to the octahedral sulfide group of minerals that have metal ions in octahedral positions, such as the iron sulfide pyrrhotite and the nickel arsenide niccolite. Zinc, cadmium, iron, copper, antimony, arsenic, bismuth and selenium also occur in variable amounts in galena.Pyrite is a brass-yellow mineral with a bright metallic luster. It has a chemical composition of iron sulfide (FeS2) and is the most common sulfide mineral. However, pyrite is often associated with gold. The two minerals often form together, and in some deposits pyrite contains enough included gold to warrant mining.
