It can be sterilized at a high temperature of 105℃ for 45-60 minutes or longer, or it can be treated with high-concentration ethanol: spray more than 85% ethanol into the powder evenly with a watering can and seal it for 12-24 hours. Then open the air, wait for the ethanol to completely evaporate, then gradually dry from low temperature to high temperature, and finally sterilize at the above high temperature. Special attention should be paid to the explosion-proof treatment of ethanol spraying, especially before drying, volatile ethanol, explosion-proof equipment, good ventilation facilities, and gradual heating to prevent explosion.