a. See:titanium dioxide
b. TiO2 . Also called titanium oxide; titanic dioxide; titanic
oxide. A common constituent of iron ores. Used as a pigment, and it
replaces zinc oxide in manufacturing white rubber and as a filler for
paper; can be used alone as a refractory and as an electrical insulator.
Its crystals show marked piezoelectric effects and have a greater
brilliance and a higher refractive index than diamond.
c. The minerals tetragonal rutile, anatase, octahedrite, and orthorhombic
brookite.
d. Commonly refers to synthetic white titanium dioxide that is produced
mainly from ilmenite, FeTiO3 , that contains 50% to 54% TiO2.
See:titanaugite
A white pulverulent titanium oxide, TiO2 , found native as
brookite, octahedrite, and rutile, and a common constituent of iron ores.
Also called titanic oxide. Fay
See:titanium dioxide
See:ilmenite
See:titanium dioxide
See:rutile
Magnetite containing titanium. Bateman, 2
A monoclinic mineral, CaTiOSiO4 ; Ca is replaced by Sr, Ba, Na, Mn,
Th, or rare earths; Ti is replaced by Al, Fe, Mg, Nb, Ta, V, or Cr; up to
1/5 of O2- may be replaced by (OH,F)- ; weakly
radioactive: forms wedge-shaped crystals; a common accessory in felsic
plutonic rocks, in gneisses, schists, and marbles; a source of titanium.
Formerly called sphene.
A silvery-gray or iron-gray, metallic element. Symbol, Ti. Found in nature
only in combined form; occurs chiefly in ilmenite (FeTiO3 ), and in
rutile and titanite. Used as an alloying agent with aluminum, molybdenum,
manganese, iron, and other metals. Used in aircraft and missiles and has
potential for use in desalination plants.
Handbook of Chemistry and Physics, 3
A compound produced by fusing titanium dioxide with carbon or calcium
carbide. Has a melting point in the range of 3,140 to 3,160 degrees C.
This very hard, refractory material is used for wear-resistant
applications and where good thermal shock resistance is needed, as in
bearings, nozzles, and special refractories under either neutral or
reducing conditions. Lee
a. Also called titanium oxide, titanic dioxide, titanic oxide, titania,
rutile, anatase, or brookite. Colorless, white, pale yellow or
yellowish-red, reddish-brown, brown, blue or bluish, violet, and black;
tetragonal and orthorhombic; TiO2 ; molecular weight, 79.90; sp gr,
3.82 to 5.13 depending on crystal system and crystal form; Mohs hardness,
5.5 to 6.5; melting point, 1,825 to 1,850 degrees C; boiling point, 2,500
to 3,000 degrees C; insoluble in water and in most acids; and soluble in
hot concentrated sulfuric acid and in alkalies. Titanium dioxide occurs as
the minerals rutile (tetragonal); anatase or octahedrite (tetragonal); and
brookite (orthorhombic). Titanium dioxide is a common constituent of iron
ores. Handbook of Chemistry and Physics, 2; CCD, 2
b. Titanium dioxide as rutile: colorless, pale yellow, reddish-brown, red,
bluish, violet, and black; tetragonal; adamantine to submetallic luster;
refractive indexes, 2.616 and 2.903; sp gr, 4.26 and ranges from 4.18 to
5.13; Mohs hardness, 6.0 to 6.5; and the same melting points, boiling
points and solubility characteristics as above. Titanium dioxide possesses
the gredatest hiding power of all the white pigments. Used in glassware
and in ceramics, in enamel frits, in welding rods, and single crystals are
used as high-temperature transducers. Syn:titania; octahedrite.
Any of three grades of titanium-dioxide-based pigments used in the
production of paints, paper, and many other products requiring a white
pigment with a high hiding power and chemical stability. Rutile and
anatase grades are more or less pure titanium dioxide, but owing to a
difference in crystal structure, they differ slightly in hiding power and
chalking quality. Titanium dioxide of pigment quality is manufactured
principally by treating finely ground ilmenite or titanium slag with
concentrated sulfuric acid. Also used in ceramics and fiberglass, and in
making titanium gems. USBM, 6
TiN; a special refractory material (melting point, 2,930 degrees C). It
can readily be produced from TiC14 and NH3 . Dodd
a. TiO2 ; used as an opacifier, particularly in vitreous enamels,
and as a constituent of some ceramic colors. Titania and titanate
electroceramics, for use in the radio frequency field, are based on this
oxide and its compounds. Titania occurs in three crystalline forms:
anatase, brookite, and rutile. Dodd
b. See:titanium dioxide
Ti5 Si3 ; sp gr, 4.2. This special ceramic has good
resistance to high temperature oxidation, but not to thermal shock.
Dodd
The metal product from reducing titanium tetrachloride with magnesium in
the Kroll process. It is called sponge because of its spongelike
appearance. Sodium-reduced metal also is referred to as sponge.
USBM, 7
See:titanomagnetite
A titaniferous andradite approaching schorlomite in composition; garnet
group.
a. A titaniferous variety of magnetite with titanium in crystal solution.
Syn:titanmagnetite
b. A term for mixtures of magnetite, ilmenite, and ulvoespinel.
CF:mogensenite
A process of concentrating iron ore that comprises the steps of (1)
effecting a dry, thermal, partial reduction of the iron in the ore to the
metallic state to a degree of reduction of between 50% and 80%, (2)
subjecting the reduced product to a magnetic separation, and (3)
recovering the magnetic concentrate. Osborne