Titanium dioxide (TiO2) is an oxide of titanium, and is called titanium dioxide when used as a pigment. This compound is a white solid that is insoluble in water, and its ore can be black. This compound has a wide range of uses as a pigment, and can be used as a paint, sunscreen, and food coloring.

There are two methods for producing titanium dioxide: sulfuric acid method and chlorination method. The sulfuric acid method is to hydrolyze ilmenite with concentrated sulfuric acid into a block solid phase, and then extract it with acidic water to obtain titanium liquid. After sedimentation to remove impurities and freezing to separate the by-product ferrous sulfate, seed crystals are added to decompose titanyl sulfate to produce metatitanic acid. After washing to meet the standards, it is calcined and crushed to obtain titanium dioxide.

Reaction equation:

“ 2H2SO4 + TiO2→Ti(SO4)2 + 2H2O

Ti(SO4)2 + H2O→ TiOSO4 + H2SO4

TiOSO4 + H2O→H2TiO3↓+ H2SO4 H2TiO3·SO3→TiO2+H2O+SO3↑ ”

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The chlorination method is to mix the crushed rutile or high-titanium slag with coke, react with chlorine in a fluidized bed chlorination furnace to generate titanium tetrachloride, purify it, add a crystal conversion agent to oxidize it in high turbidity to generate titanium dioxide, and then wash it with water, dry it, and crush it. Reaction equation:

2TiO2 + 3C + 4Cl2→2TiCl4 + 2CO↑+ CO2↑

TiCl4 (g) + O2 (g) → TiO2 (s) + 2Cl2 (g)

USE

Paint, plastic, rubber

Food coloring E171

Sunscreen and UV absorber, used in cosmetics

Dye-sensitized solar cells

White crystalline TiO2 has a high refractive index and can be used as a gemstone

Correction fluid, correction tape

Catalyst for biosensing nanogold

Airwaves chewing gum

As a catalyst for Claus chemistry and organic sulfur (COS and CS2) hydrolysis chemistry