Chrome Ore

Chromite is an iron chromium oxide: FeCr2O4. It is an oxid mineral belonging to the spinel group. Magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite (MgCr2O4); substitution of aluminium occurs leading to hercynite (FeAl2O4).

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.

Properties of Chromite

Chromite can be challenging to identify. Several properties must be considered to differentiate it from other metallic ores. 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. 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.

Use

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. 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 aluminothermin 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.Chromite is also used as a refractory material, because it has a high heat stability.

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. It is also sometimes used as a gemstone.

Ferrochrome

Ferrochrome (FeCr) is a corrosion-resistant alloy of chrome and iron containing between 50% and 70% chrome. Ferrochrome production is essentially a carbothermic reduction operation taking place at high temperatures. Cr Ore, an oxide of chromium and iron, is reduced by coal and coke to form the iron-chromium alloy. The heat for this reaction comes typically from the electric arc formed between the tips of the electrodes in the bottom of the furnace and the furnace hearth. This arc creates temperatures of about 2800°C. In the process of smelting, huge amounts of electricity is consumed.

The material is tapped from the furnace intermittently. When enough smelted ferrochrome has accumulated in the hearth of the furnace, the tap hole is drilled open and the molten metal and slag are rushed down to a sand bed or cast iron ladles. Once the metal solidifies into cakes, these are shifted to the handling yard where they are cooled down, cleaned and further broken into pieces as per specification of the Customers and packed for dispatch after thorough quality checks.

Ferrochrome processing

Chrome Ore:

Iran with containing 4% of all chromite mines in the world and with many inexpensive sea routes has the potential ability to supply many industries. There are some chromite mines in Pasargad Neshan Pars with different percentage.

Ore

Grade

Location

Cr

38 – 42

Kerman

Cr

>42

Kerman

Contact to order Customer

Minimum Quantity in per Month: 15000 Ton

Loading: Chromite mines in the country

Grade: Top of 38%

Company warehouse: Special Economic Zone, Rafsanjan, Kerman province