Purification method for mica

The invention discloses a purification method for mica, which relates to mica. The invention provides a purification method for mica, which can obviously simplify processes. The purification method comprises the following steps of: putting a mica raw material and alkali into water to obtain slurry; putting the slurry in a hydrothermal kettle for heat preservation; dissolving the slurry subjected to heat preservation into hydrochloric acid, and filtering out insoluble substances after reacting; and filtering, water washing and drying the insoluble substances to obtain purified mica. According to the purification method, the mica is purified by utilizing a hydrothermal kettle steaming and boiling treatment process, so that the purification method has the advantages of simplicity in process,good operability, low equipment requirement, moderate treatment condition, wide application range and the like and can be applied to purification of various types and different qualities of mica (white mica, black mica, brown mica and lithia mica); and the purified mica has good quality, and can be widely applied to various high-end fields and can meet the requirement of various special properties (such as high insulativity), so that the added value of the purified mica and the economic value of enterprises can be greatly improved.