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Molybdenum is used in various industrial sectors in the form of molybdenum disulfide, molybdenum compounds, metal molybdenum, low alloy molybdenum-based materials, and high alloy steel. The amount of Mo in steel and cast iron of the total consumption of about 75% to 80%. In addition to being used as an additive for steel alloys, molybdenum is widely used in civil applications such as petroleum and chemical, electrical and electronic technology, metallurgical machinery, medicine and agriculture. Especially in the chemical field, the use of molybdenum compounds as catalysts and additives, high-temperature lubricants is increasing, and varieties are gradually increasing. In addition, metal molybdenum and molybdenum alloys are used in some high-tech fields such as cutting-edge and aerospace. Molybdenum is sprayed on mechanical and engine components to greatly increase wear resistance and extend service life.
China had a mining industry of molybdenum before 1949, but the smelting and processing industry of molybdenum was gradually established since 1957. After the 1980s, China's molybdenum mining and smelting and processing system achieved rapid development.
Introduction to molybdenum
Molybdenum is one of a refractory metal element in the periodic table of elements of group VI B, atomic number 42, atomic weight 95.94. 1778 Swedish chemist CWScheele molybdenite decomposition with nitric acid which found a new element, which Named molybdenum (molybdos). In 1782, the Swedish chemist PJHjelm used carbon to reduce MoO 3 to obtain a purer metal molybdenum. At the beginning of the 19th century, pure MoO3 was reduced with hydrogen to obtain a purer metal molybdenum. At the end of the 19th century, it was found that molybdenum additives had a great influence on the properties of steel. Especially after the discovery of molybdenum-containing steel in 1910, the production of molybdenum steel containing molybdenum armor steel, tool steel and medium and high strength steel began to be obtained. A wide range of developments. After adding the molybdenum additive to the steel, it can refine the grains, increase the recrystallization temperature, and significantly improve the hardenability, toughness, high temperature strength and creep properties of the steel. Therefore, the molybdenum becomes heat-resistant, wear-resistant and resistant. An important component of various structural steels.