ilmenite


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Related to ilmenite: magnetite, rutile

ilmenite

(ĭl`mĕnīt), black mineral, iron titanium oxide, FeTiO3, crystallizing in the hexagonal system. It is sometimes found as tabular hexagonal crystals but occurs more commonly as small grains in igneous and metamorphic rocks and in sands derived from them. Ilmenite has been noted as an important constituent of lunar rocks. It is the commonest titanium mineral and is the most important source of this element and its compounds. Over 3 million tons of ilmenite are mined annually; important producers are the United States, Canada, Australia, and Norway.

Ilmenite

 

(named after the deposit in the Il’men Mountains, where ilmenite was first found), a mineral whose composition is FeTi03 (47.34 percent FeO and 52.66 percent Ti02). Its composition is not constant. Fe2+ is replaced isomorphically by Mg2+ and Mn2+ ; correspondingly, ilmenite may contain up to 17 percent MgO (magnesian ilmenite) and 14 percent MnO (manganoan ilmenite). Admixtures of Nb, V, Cr, Co, and Ni are also known.

Ilmenite crystallizes in the trigonal system; it sometimes forms complex rhombohedral crystals and, more frequently, granular masses and continuous agglomerates of black color with a bright submetallic luster. Nontransparent and magnetic, ilmenite has a hardness of 5–6 on the mineralogical scale and a density of 4,600 to 4,800 kg/m2. The crystalline structure of ilmenite is similar to that of hematite, which often occurs in ilmenite as a solid solution or as a product of its decay. In the crystallization of natural ore melts high in Ti with an excess of FeO and Fe203, so-called titanomagnetites are formed. Deposits of ilmenite (and titanomagnetites) are connected with gabbroid type igneous rocks. It is known as a magmatic mineral in kimberlites, forms agglomerates in alkaline syenite pegmatites, and accumulates in placer deposits. In the USSR deposits are found in the southern and central Urals, in the Altai, on the Kola Peninsula, and in the Ukraine. Ilmenite is a valuable ore for obtaining titanium and its derivatives, which are widely used in metallurgy and the chemical and other industries.

G. P. BARSANOV

ilmenite

[il·mə‚nīt]
(mineralogy)
FeTiO3 An iron-black, opaque, rhombohedral mineral that is the principal ore of titanium. Also known as mohsite; titanic iron ore.

ilmenite

A mineral which is commonly used as an aggregate in high-density concrete; also called iron titanate.
References in periodicals archive ?
Ilmenite presence in a further AK sample is confirmed to be pseudo-rutile,
This production will not affect the price of rutile since it has been in short supply for over a decade and the cost of Synthesizing ilmenite to rutile has been going up due to the increasing cost of energy.
Ilmenite is mostly present in large liberated grains 2.
The low Fe3+ was verified in an earlier study of A15/1 ilmenite that indicated a good to excellent preservation potential for diamond and low resorption.
The ilmenite would be a feed source for the production of synthetic rutile.
Such forward-looking statements, including but not limited to those with respect to the prices of rutile, zircon and ilmenite, estimated future production, estimated costs of future production, the Company's sales policy and permitting time lines, involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements.
Current grades of ilmenite on the world market are A, B and C.
Ilmenite compositions continue to build on initial indications, suggesting two source kimberlite bodies.
Ilmenite and rutile production through the mineral separation plant
Kenmare said the need to move mining equipment from a low-lying area to a higher one would imply that production would be around 10% down on this year s targets of 630,000t of ilmenite and 50,000t of zircon.
The indicator minerals include 5 kimberlitic garnets and over 1000 ilmenites (due to substantial quantities of ilmenite in all size fractions of the samples, the lab was instructed to stop picking at 50 visually identified kimberlitic ilmenites per size fraction after the initial 3 samples were picked).