The introduction of titanium

Titanium is a chemical element, chemical symbol Ti, atomic number 22, in the periodic table of chemical elements in the fourth period, IVB group. It is a silver-white transition metal characterized by light weight, high strength, metallic luster and resistance to wet chlorine corrosion. But titanium can not be applied to dry chlorine gas, even if the temperature of dry chlorine gas below 0℃, there will be a violent chemical reaction to generate titanium tetrachloride, and then decomposition to generate titanium dichloride, or even combustion. Titanium remains reliable in chlorine only when the water content is above 0.5%. Titanium is considered a rare metal because of its dispersion in nature and its difficulty in extraction. But it is relatively abundant, ranking tenth among all elements. Titanium ore mainly ilmenite and rutile, widely distributed in the earth's crust and lithosphere. Titanium is also present in almost all organisms, rocks, water bodies and soil. The extraction of titanium from the main ore requires the Croll or Hunter process. The most common compound for titanium is titanium dioxide, which can be used to make white pigments. Other compounds include titanium tetrachloride (TiCl4), used as a catalyst and as a smokcreen for air cover, and titanium trichloride (TiCl3), used to catalyze the production of polypropylene.

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