Natural Raw Materials

Titanium is the ninth most abundant element in the earth’s crust, and it is always found in combination with oxygen. The most important titanium minerals are shown in Table 2.4. From the natural titanium minerals, only ilmenite, leucoxene and rutile are of economic importance. Leucoxene is a weathering product of ilmenite.

The largest titanium reserves in the world are in the form of anatase and titano — magnetite, but these cannot be worked economically at the present time. About 95%

Tab. 2.3: Production of titanium-containing raw materials (2000).

Product

Process

t a"1 (as TiO2 units)

Ilmenite

Sulfate

1,005,000

Ilmenite and leucoxene

Chloride

649,000

Rutile

Chloride

390,000

Total mineral feedstock

2,044,000

Synthetic rutile

Chloride

821,000

Skg

Sulfate

738,000

Skg

Chloride

832,000

Upgraded slag

Chloride

143,000

Total upgraded feedstock

2,534,000

Total feedstock

4,578,000

Tab. 2.4: Titanium minerals

Mineral

Formula

TiO2 content (wt%)

Rutile

TiO2

92-98

Anatase

TiO,

90-95

Brookite

Ti02

90-100

Ilmenite

FeTiO3

35-60

Leucoxene

Fe2O3TlO2

60-90

Perovskite

CaTiO3

40-60

Sphene (titanite)

CaTiSiO5

30-42

Titanomagnetite

Fe(Ti)Fe2 O4

2-20

of the world’s production of ilmenite and rutile is used to produce TiO2 pigments, the remainder for the manufacture of titanium metal and for welding electrodes.

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