Calcining: Heat treatment at a certain temperature in air or in an inert gas stream, known as calcination or calcination, is the thermal dissociation or transformation of a natural compound or man-made compound; this time the compound is heated to dissociate into a simpler compound. Or crystal transformation occurs. Thermal dissociation of carbonates is called baking. The calcining operation can be used to directly process the mineral raw materials to be suitable for the subsequent process requirements, and chemical concentrates can also be used to make chemical concentrates to meet the requirements of the users. The main physical and chemical changes that occur during the calcination process are: (1) Thermal decomposition. Removal of chemically bound water, CO2, NOx and other volatile impurities, at higher temperatures, the oxide may also occur solid-phase reaction, resulting in an active compound state; (2) recrystallization, can get a certain crystal shape, crystal size, pore structure and specific surface; (3) The crystallites are properly sintered to increase the mechanical strength. The main factors affecting the calcination process are: calcination temperature, gas phase composition, thermal stability of the compound, and the like. Therefore, according to the different thermal stability of various compounds (such as carbonates, oxides, hydroxides, sulfides, and oxyacid salts), the use of controlled calcination temperature and gas phase composition can selectively change certain compounds. The composition or the occurrence of the transformation of the crystal form and the treatment with the corresponding method can achieve the purpose of removing the impurities and separating the enrichment of the useful group. Muffle furnace: translated from English Muffle furnace. Muffle is the meaning of the package, furnace is the meaning of the furnace, the furnace. The general name of muffle furnace in China is the following: electric furnace, resistance furnace, Maofu furnace, Ma Fu furnace. The muffle furnace is a general-purpose heating device. According to the appearance shape, it can be divided into box furnace furnace and tube furnace. The muffle furnace is divided into domestic muffle furnace and imported muffle furnace according to nationality. Divided by heating elements: electric furnace wire muffle furnace, silicon carbon rod muffle furnace, silicon molybdenum rod muffle furnace; Divided according to the rated temperature are generally divided into: 1000 degree muffle furnace, 1200 degree muffle furnace, 1300 degree muffle furnace, 1600 degree muffle furnace, 1700 degree muffle furnace. According to the controller to distinguish the following: pointer table, ordinary digital display, PID adjustment control table, program control table; According to the insulation material to distinguish: ordinary firebrick and ceramic fiber two. The muffle furnace is a periodic operation type for laboratory, industrial and mining enterprises, scientific research units for elemental analysis and general small steel quenching, annealing, tempering and other heat treatment heating, high temperature Muff furnace can also be used for sintering, dissolution of metals, ceramics , analysis and other high-temperature heating Features: (1) This product has a wide range of applications and can be used for weight analysis: determination of organic matter and coal ash. (2) The heating element is installed on the inner wall to accelerate the temperature rise and heat evenly. (3) The heating element is made of a special refractory material and completely concealed in the inner wall to avoid contact with corrosive gases, vapors, etc., thereby prolonging its service life. (4) The muffle furnace and the control part are separately set so that the electronic temperature controller can accurately grasp the temperature even under long-term operation conditions. (5) The outer shell of the muffle furnace is double-layered, during which the circulation of air can maintain the low temperature of the surface without worrying about the occurrence of burns. (6) The digital setting and display indicate the exact temperature. Maintenance and precautions: 1. When the muffle is used again after it is used for the first time or after it has been decommissioned for a long time, the oven must be performed. The oven time should be room temperature 200 °C for four hours. 200°C to 600°C for four hours. When using, the maximum furnace temperature must not exceed the rated temperature, so as not to burn the heating element. It is forbidden to inject various liquids and easily soluble metals into the furnace. The Maofu furnace is best to work below the maximum temperature of 50°C. At this time, the furnace wire has a long life. 2. The muffle and controller must work in locations where the relative humidity does not exceed 85% and there is no conductive dust, explosive gas, or corrosive gas. Where metal materials such as grease are to be heated, a large amount of volatile gases will affect and corrode the surface of the heating element, allowing it to be destroyed and shortened. Therefore, heat should be promptly prevented and sealed container or appropriate openings to be eliminated. 3. The muffle controller should be limited to use in the ambient temperature range of 0-40 °C. 4. According to technical requirements, regularly check whether the connection of the electric furnace and the controller's wiring is good or not, whether the pointer is stuck during the movement of the pointer, and use the potentiometer to calibrate the meter due to magnetic steel, demagnetization, wire drawing, shrapnel. The increase in error caused by fatigue, balance failure, etc. 5. The thermocouple should not be pulled out suddenly at high temperature to prevent the coat from bursting. 6. Always keep the furnace clean and remove any oxides in the furnace. Usage Note: Do not bake flammable or explosive materials in the furnace to avoid danger! It is also not allowed to heat volatile corrosive substances, otherwise it will affect its service life Flag Pole,Garden Flag Pole,Flag Poles For Sale,Portable Flag Pole CHANGZHOU STORMFLAG CO., LTD , https://www.stormflagchina.com