Catalyst for the electrolytic manganese industry; in terms of metallurgy, the amount of selenium used in the electrolytic manganese industry accounts for a large proportion of total selenium production. In addition, selenium-containing carbon steel, stainless steel and copper alloys have good processing properties and can be cut at high speeds. parts with smooth surface

Selenium element symbol Se, molecular weight is 78.96. The outermost electronic structure is 4S~P4, and selenium has four valence states: -2, 0, +4, and +6. Elemental selenium is divided into amorphous and hexagonal crystals. It is a gray-black powder with a melting point of 217°C, a boiling point of 685°C, and a specific gravity of 4.81.