Molybdenum is a metallic element, element symbol: Mo, atomic number 42, is a VIB group metal. Molybdenum has a density of 10.2g/cm³, a melting point of 2610℃, and a boiling point of 5560℃. Molybdenum is a silver-white metal, hard and tough, high melting point, heat conductivity is also relatively high, at room temperature does not occur with air oxidation reaction. As a transition element, it is easy to change its oxidation state, and the color of molybdenum ion will also change with the change of oxidation state. Molybdenum is a necessary trace element for human body and animals and plants, and plays an important role in the growth, development and heredity of human beings and animals and plants. The average content of molybdenum in the Earth’s crust is 0.00011%, the global molybdenum resource reserves are about 11 million tons, and the proved reserves are about 19.4 million tons. Because molybdenum has the advantages of high strength, high melting point, corrosion resistance, wear resistance, etc., it is widely used in steel, petroleum, chemical, electrical and electronic technology, medicine and agriculture and other fields.