Microwave frequency of 300 MHz electromagnetic The media material is heated, the water molecules are polar molecules. In the rapidly changing high-frequency electromagnetic field, the very sexual orientation with the changes of the external electric field changes caused by the movement of molecules and mutual friction effect. The field of the microwave field can be transformed into the heat medium, so that the material temperature to produce a series of physical and chemical process of heating and puffed by microwave heating and drying purposes. 
 The mechanism of microwave sterilization 
 Microwave sterilization is the use of the result of the role of the thermal effects of electromagnetic fields and biological effects. The thermal effect of microwave on bacteria to protein denaturation, the bacteria lost the conditions of nutrition, reproduction and survival and death. The biological effects of microwave on bacteria is the microwave electric field to change the permeability of the membrane cross-section, bacteria, therefore malnutrition can not be normal metabolism, bacterial structure and function of disorder that, growth is inhibited and death. In addition, determine the normal growth and stability of the bacterial genetic reproduction of nucleic acids (RNA) and deoxyribonucleic acid (DNA), relaxation, by a number of hydrogen bond breakage and restructuring, and induce genetic mutations, or chromosomal whispering sound distortion, or even fracture. 

 Microwave heating, the main features of 
 1, the rapid heating 
 Microwave heating with conventional heating methods are completely different. It is the material is heated to body heat, no heat conduction process. Thus, despite the poor thermal conductivity of materials can also be a very short time to reach the heating temperature. 
 2, uniform heating 
 Regardless of the various parts of the shape of the object, microwave heating can make the object table at the same uniform penetration of electromagnetic waves to generate heat. Therefore, heating uniformity, does not appear outside the focus of endogenous phenomenon. 
 3, energy efficient 
 Containing water substances that can absorb microwave heat, so in addition to a small amount of transmission loss, almost no other loss. The high thermal efficiency and energy saving. Heating energy than infrared 1/3. 
 4, mold, sterilization, and preservation of 
 Microwave heating with thermal effects and biological effects in the temperature of low temperature sterilization and mildew. Fast heating time is short, best to preserve the vitamins in the activity and food materials, the original color and nutrients. 
 5, the advanced technology 
 Microwave power can be realized immediately heating and termination. Application of human-machine interface and PLC heating process and heating. Programmable automatic control of the process specification. 
 6, safe 
 Because microwave energy to control the metal heated indoor and waveguide microwave leakage minimal radiation hazards and harmful emissions, no waste heat and dust pollution, neither contamination of food, do not pollute the environment. 
 Microwave equipment is also widely used in the class of iron ore (limonite, magnetite, hematite, ilmenite, vanadium and titanium magnetite, iron sulfide, pyrrhotite, pyrite, nickel pyrite magnet pyrite, etc.), copper class (chalcopyrite, bornite, tetrahedrite, cuprous oxide, copper oxide), manganese class (pyrolusite, hausmannite, brown manganese carbonate, manganese ore, etc.), lead-antimony ore class (galena, reminders of the sulfur of lead-antimony ore) bauxite class (such as diaspore, boehmite, gibbsite stone), the rapid drying of various types of minerals