White solid or powder form of gender oxide. Also known as titanium dioxide. Chemical formula TiO2, 79.9 molecular weight, melting point of 1830 ~ 1850 ℃, boiling point of 2500 ~ 3000 ℃. Titania exists in nature in three variants: rutile tetragonal crystal; anatase tetragonal crystal; orthorhombic brookite crystal. Titanium dioxide solubility in water is small, but can be dissolved in acid, it can be dissolved in alkali, the chemical reaction equation is as follows:
Titanium dioxide and acid reaction:
TiO2 + H2SO4 = TiOSO4 + H2O
Titanium dioxide and alkali reaction:
TiO2 +2 NaOH = Na2TiO3 + H2O
Rutile titanium dioxide can be extracted by acid decomposition, or by the decomposition of titanium tetrachloride are. Titanium dioxide is stable, a large number of white pigment used in paint, it has good cover ability, and lead white were similar, but not white will be black lead; it has the same durable zinc white. Enamel titanium dioxide is also used as a matting agent, can produce a very bright, hard and acid resistance of enamel enamel overlay. Titanium oxide - titanium dioxide is white powder, is the best white pigment, commonly known as titanium dioxide. Previously, people mining titanium, the main purpose is to obtain titanium dioxide. Strong adhesion of titanium dioxide, not easy to chemical changes, is always white. Particularly valuable is non-toxic titanium dioxide. Its high melting point, was used to make fire-resistant glass, glaze, enamel, pottery, utensils and other high-temperature experiments.