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Titanium dioxide is typically prepared through the sulphate process or the chloride process. In the sulphate process, naturally occurring ilmenite (an ore of titanium) is dissolved in sulfuric acid to produce a solution of titanium sulfate. This is then hydrolyzed in a heated solution to form a hydrous titanium oxide which, upon calcination, yields titanium dioxide. The chloride process involves the chlorination of titanium-containing minerals in the presence of carbon to produce titanium tetrachloride. This is then oxidized at a high temperature to produce the pigmentary titanium dioxide. Both methods require subsequent steps to purify and mill the product to create the required particle size and crystalline form.
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