Cerium oxide is an inorganic substance with the chemical formula CeO2, light yellow or yellowish brown co-powder. The density is 7.13g/cm3, the melting point is 2397 °C, insoluble in water and alkali, slightly soluble in acid. At the temperature of 2000 °C and the pressure of 15MPa, cerium oxide can be obtained by reducing cerium oxide by hydrogen, the temperature is free between 2000 °C, and the pressure is free at 5MPa pressure, cerium oxide is slightly yellow and reddish, and pink, and its performance is to be used as polishing materials, catalysts, catalyst carriers (additives), ultraviolet absorbers, fuel cell electrolytes, automobile exhaust absorbers, electronic ceramics, etc.
The salts of cerium oxide rare earth elements can reduce the content of prothrombin, inactivate it, and inhibit the production of thrombolivesin, so that fibrinogen precipitates, catalyzes the decomposition of phosphoric acid compounds, and the toxicity of rare earth elements decreases with the increase of atomic weight.
Inhalation contains cerium dust, occupational pneumoconiosis, and its chloride damages the skin and can irritate the mucous membranes of the eyes.
The maximum allowable concentration: cerium oxide 5 mg/m3, cerium hydroxide 5 mg/m3, wear a gas mask when working, if there is radioactivity, special protection should be carried out, and dust should be prevented from scattering. [1]