Electrostatic precipitator is one of the gas dedusting methods. When the dust gas is separated by the high voltage electrostatic field, the dust particles and the negative ions are negatively charged and tend to be deposited on the anode surface. In metallurgical, chemical and other industries, it is used to purify gas or to recover useful dust particles. The use of the electrostatic field to ionize the gas so that the dust particles are charged to the electrode. In a strong electric field, the air molecules are ionized into positive ions and electrons. The dust particles are encountered during the process of the electrons to the positive pole, so that the dust particles are collected with negative electricity to the positive pole. Of course, through technological innovation, there is also the use of negative plate dust collection. Coal - fired plants and power stations are used to collect coal ash and dust in the flue gas. In metallurgy, it is used to collect tin, zinc, lead, aluminum and other oxides, and also can be used for household dust removal and sterilization products.