Method for preparing expanded vermiculite by utilizing ultrasonic pretreatment way

The invention discloses a method for preparing expanded vermiculite by utilizing an ultrasonic pretreatment way, comprising the following steps of: (1) taking industrial vermiculite, screening and grading, removing impurities and selecting vermiculite raw materials with the flake size of 0.3-5mm; (2) injecting hydrogen peroxide with the concentration of 5-30 percent into a vessel, immersing the vermiculite raw materials into the hydrogen peroxide and soaking for 1-14h; (3) placing the soaked vermiculite raw materials into an ultrasonic device and ultrasonically pretreating the vermiculite raw materials for 10-60min to promote hydrogen peroxide molecules dispersed in the vermiculite raw materials into spaces among crystal layers; and (4) taking the ultrasonically pretreated vermiculite raw materials out, standing for 1-2h, then placing the vermiculite raw materials into a microwave device and carrying out microwave expansion for 0.5-4min to prepare the expanded vermiculite. The method is beneficial to shorteni