Fremgangsmåde og apparat til udvinding af gips fra affaldsvægplader

摘要

PCT No. PCT/CA91/00006 Sec. 371 Date Jan. 21, 1993 Sec. 102(e) Date Jan. 21, 1993 PCT Filed Jan. 8, 1991 PCT Pub. No. WO92/00152 PCT Pub. Date Jan. 9, 1992.This invention pertains to a method and apparatus for reclaiming gypsum from waste paper laminated gypsum wallboard. The invention is directed to an apparatus that is useful for separating paper laminate from gypsum wallboard comprising: a roller and a plate spatially disposed from the roller. The aperture between the roller and the plate is sized to be slightly less than the wallboard thickness thereby creating a fracturing action between the gypsum and the paper laminate. The first roller can be driven by a power source. A roller can be substituted for the plate and can be undriven or driven independently of the first roller.