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Muffle Furnace Common names are the following
The physical and chemical changes that occur mainly in the calcination process are: (1) thermal decomposition. (2) recrystallization, can be a certain crystal form, the crystal size, the crystal size, the size of the crystal, the crystal can be obtained by the chemical reaction of water, CO2, NOx and other volatile impurities, at higher temperatures, the oxide may also occur solid phase reaction, the formation of active state; Pore structure and specific surface; (3) microcrystalline proper sintering to improve the mechanical strength.
The main factors affecting the calcination process: calcination temperature, gas phase composition, the thermal stability of the compound and so on. Therefore, depending on the thermal stability of various compounds (such as carbonate, oxide, hydroxide monosulfide, oxalate, etc.), the controlled calcination temperature and gas phase composition can be used to selectively change the Composition or the occurrence of crystal shape changes, and then the corresponding method of treatment, can be achieved to remove impurities and make the use of the purpose of separation of enrichment.
Muffle furnace: is the English Muffle furnace translated over. Muffle is the meaning of the package, the furnace is the stove, the meaning of the furnace. Muffle furnace in China, the common name has the following: electric furnace, resistance furnace, Maofu furnace, Ma Fu furnace. Muffle furnace is a general heating device. According to the appearance of shape can be divided into box-type furnace tube furnace crucible furnace. Muffle furnace by nationality is divided into domestic muffle furnace and imported muffle furnace. According to the heating element to distinguish there are: electric furnace silk muffle furnace, silicon carbon rod muffle furnace, silicon molybdenum rod muffle furnace; rated by the rated temperature is divided into: 900 degrees series muffle  furnace, 1000 degrees muffle furnace , 1200 degrees muffle furnace, 1300 degrees muffle furnace, 1600 degrees muffle furnace, 1700 muffle furnace. According to the controller to distinguish between the following: pointer table, ordinary digital display table, PID control table, program control table; according to insulation materials to distinguish: ordinary refractory bricks and ceramic fiber two. Muffle furnace cycle cycle for the laboratory, industrial and mining enterprises, scientific research units for elemental analysis and general small steel quenching, annealing, tempering and other heat treatment with heat, high temperature Ma Fu furnace can also be metal, ceramic sintering, dissolved , Analysis and other high temperature heating
Maintenance and precautions:
1. When the muffle furnace is used for the first time or after prolonged use, the oven must be used. Oven time should be room temperature 200 ℃ for four hours. 200 ° C to 600 ° C for four hours. When used, the maximum temperature shall not exceed the rated temperature, so as not to burn the heating element. It is forbidden to fill the furnace with various liquids and soluble metals. The furnace is preferably operated below 50 ℃ below the maximum temperature, and the furnace has a longer life.