Chromite FeCr

The first source of chromium was found in the mineral crocoite. Today it is obtained from the mineral chromite (FeCr O ), which is found in Cuba, Zimbabwe, South Africa, Turkey, Russia, and the Philippines. Chromite is an ordinary blackish substance that was ignored for many years. There are different grades and forms of chromium ores and compounds, based on the classification of use of the element. Most oxides of chromium are found mixed with other metals, such as iron, magnesium, or aluminum. 

With a relative abundance in the Earth s crust of 122 mg/kg, chromium is the 21st most abundant element and the 6th most abundant transition metal after iron, titanium, manganese, zirconium, and vanadium it is more abundant than nickel, zinc, and copper. Though native chromium is extremely rare (e.g, Udachnaya Mine in Russia), most common chromium-bearing minerals are the spinel-type mineral chromite [FeCr O, cubic] and, to a lesser... 

Write an equation for the chemical reaction that occurs on fusion of a mixture of chromite (FeCr Oj), potassium carbonate, and potassium chlorate (which forms potassium chloride). 

Most important mineral Chromite FeCr O (Figure M J5) Ranking in order of abundance in earth crust 21... 

The new metal chromium was discovered in 1797. Before the end of the century two discoveries of lead-free chromium minerals were made. These minerals are known today as chromite, FeCr O, that is FeO Cr Oj. Chromite is in reality a chrome spinel with the general formula ([Mg, Fe ][Cr,Al,Fe ])20. In good chromium ore, of course, Fe predominates in the first square bracket and Cr in the second. 

Chromite, FeCr O (Figure M35) is the only chromium mineral that is economically... 

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