METHOD FOR SEPARATING AND RECOVERING GYPSUM AND BOARD STENCIL PAPER FROM BOARD STENCIL PAPER TO WHICH GYPSUM IS ADHERED

摘要

PPROBLEM TO BE SOLVED: To provide a method for separating and recovering gypsum and board stencil paper from board stencil paper to which gypsum is adhered generated after a core member is removed from gypsum board waste at a recyclable purity. PSOLUTION: The method for separating and recovering gypsum and board stencil paper from the board stencil paper to which gypsum is adhered that is separated from gypsum board waste, includes making the gypsum adhered to the board stencil paper hemihydrate gypsum and then contacting the board stencil paper to which the hemihydrate gypsum is adhered with an aqueous slurry containing gypsum dihydrate. PCOPYRIGHT: (C)2010,JPO&INPIT