Molybdenum is found in the late 18th century, and there is no presence of molybdenum metal form under natural conditions. Despite this, the main mineral of molybdenum, molybdenite, has been used in ancient times, but molybdenite is similar to lead , galena and graphite . It is difficult to distinguish. The word "molybdos" is lead in Greek. the meaning of. It was found to contain molybdenum in a Japanese sword in the 14th century. By 1778, the Swedish scientist Carl Wilhelm Scheele confirmed the existence of molybdenum. He heated the molybdenum ore in the air to produce a white oxidized powder. Shortly thereafter, by 1782, Peter Jacob Hjelm succeeded in reducing this oxide with carbon to obtain a ferrous metal powder, which he called "molybdenum". In the 19th century, molybdenum was basically used as an experimental product, and it was gradually produced later. In 1891, France Snyder Schneider) the first company to produce molybdenum as an alloying element molybdenum-containing armor plate, they immediately found that only half the density of molybdenum, tungsten, so since, molybdenum effective in many areas of steel alloy application to Replaced tungsten. Molybdenum has a higher melting point (2625 ° C), a boiling point (4600 ° C), a hardness (5.5) and a density (10.2 g / cm 3 ), and is a good conductor of electricity and heat. The relative atomic weight is 95.94 g / g, which is in the periodic table. Group VI B element, atomic number 42, atomic volume 9.42 cm3/mol. At normal temperature, molybdenum is stable in air or water, but when the temperature reaches 400 ° C, slight oxidation begins to occur. When it reaches 600 ° C, it undergoes intense oxidation to form MoO 3 . Hydrochloric acid, hydrofluoric acid, dilute nitric acid and an alkaline solution have no effect on molybdenum. Molybdenum is soluble in nitric acid, aqua regia or hot sulfuric acid solutions. Second, the use of molybdenum ore 1. Molybdenum is widely used in alloying additives, producing stainless steel, tool steel, and temperature resistant steel. 2. Molybdenum steel is widely used in metal pressure processing industry, metallurgical industry, building materials industry, machinery industry, aerospace military and industry, nuclear industry, chemical textile industry and agriculture. 3. Molybdenum can also be used as a chemical raw material to produce catalysts, lubricants, pigments and fertilizers. 4, in the metallurgical industry, the production of molybdenum as an additive alloy, or tungsten, nickel, cobalt, zirconium, titanium, vanadium, rhenium and other advanced alloy composition to improve its high temperature strength, wear resistance and corrosion resistance . Metal molybdenum is widely used as a heating material and structural material for high-temperature electric furnaces, a large electrode and a gate of a vacuum tube, a semiconductor, and an electric light source material. In the chemical industry, molybdenum is mainly used in lubricants, catalysts and pigments.
Other special steel Is different from the traditional steel, it is mainly formed by the alloy, generally has good oxidation resistance, corrosion resistance, high temperature resistance and other characteristics, it can be applied in a very harsh environment. Used for special industries. The main use is the production of various furnace components, the maximum temperature of 1300 degrees Celsius, could be applied in the condition of high temperature 1150℃. Such as furnace materials, automotive cleaning equipment, materials, etc.. As well as nuclear reactor cooling system, heating furnace, carburizing basket and fasteners, heat treatment fixture.
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History, nature and use of molybdenum ore
1. History and nature of molybdenum ore