Sodium removal method for high sodium coal

The invention relates to a sodium removal method for high sodium coal. The sodium removal method comprises the following steps: crushing high sodium raw coal into crushed raw coal; wetting the crushed raw coal with ultrapure water, and standing for a certain period of time to obtain wetted coal; performing microwave heating treatment on the wetted coal in a microwave oven, and carrying out heat preservation for a certain period of time, thereby obtaining coal subjected to microwave treatment; cooling the coal subjected to microwave treatment to 50-70 DEG C, stirring and washing for 5-15 minutes, and separating liquid waste, thereby obtaining upgraded coal; and performing hot air drying treatment on the upgraded coal to obtain low sodium coal. According to the sodium removal method, the process is simple, the processing period is short, the content of sodium in coal in Zhundong can be lowered effectively, the quality of the raw coal is improved, the problems of staining, slagging and dust collecting of heat exchange surfaces of a boiler and other equipment while burning high sodium coal are solved, and the obtained coal is suitable for industrial production.