Titanium dioxide

An overview of titanium dioxide, its properties, applications, and production

Anatase crystal structure of titanium dioxide

Major industrial producers of titanium dioxide

Evolution of titanium dioxide production

Patent families related to titanium dioxide production from ilmenite

Titanium dioxide (TiO₂) is a naturally occurring oxide of titanium, widely used in various industries due to its unique properties. It is a white, opaque compound with high refractive index, making it an excellent pigment and UV filter.

Properties

Titanium dioxide exists in several crystalline forms, the most common being anatase and rutile. These forms differ in their crystal structure and optical properties. Anatase is known for its photocatalytic activity, while rutile is more stable and has a higher refractive index.

Applications

Titanium dioxide is used in a wide range of applications:

• Pigments: It is the most widely used white pigment in the world, providing whiteness and opacity to products such as paints, coatings, plastics, papers, inks, foods, and cosmetics.
• Sunscreens: Due to its ability to absorb UV light, titanium dioxide is a key ingredient in sunscreens, protecting the skin from harmful UV radiation.
• Photocatalysis: Anatase form of titanium dioxide is used in photocatalytic applications, such as self-cleaning surfaces and air purification.
• Food Additive: It is used as a food coloring agent, known as E171 in the European Union.

Production

Titanium dioxide is primarily produced from ilmenite, a mineral that contains iron and titanium. The production process involves several steps:

1. Extraction: Ilmenite is mined and processed to remove impurities. 2. Conversion: The purified ilmenite is converted into titanium dioxide through either the sulfate process or the chloride process. 3. Finishing: The resulting titanium dioxide is milled and surface-treated to enhance its properties for specific applications.

Health and Safety

While titanium dioxide is generally considered safe, there are concerns about its potential health effects when inhaled as a fine dust. Regulatory agencies continue to evaluate its safety in various applications.

Environmental Impact

The production and use of titanium dioxide can have environmental impacts, including energy consumption and waste generation. Efforts are ongoing to develop more sustainable production methods.

Also see

• Ilmenite
• Rutile
• Anatase
• Pigment
• Sunscreen