Method of recovering a base paper for gypsum board and apparatus of recovering a base paper for gypsum board

Abstract

There are provided a method of recovering a base paper for gypsum board for continuously and efficiently recovering a base paper for gypsum board from a waste material of gypsum board including a gypsum core and the base paper for gypsum board adhering thereto. The method of recovering a base paper for gypsum board includes steps of breaking the waste material of gypsum board, separating a gypsum component and a paper piece of the base paper for gypsum board from the broken waste material of gypsum board, and washing the separated paper piece with water using a rotary drum-type washing device so as to eliminate a gypsum component adhering to the paper piece.

1 . An apparatus of recovering a base paper for gypsum board, comprising
 a breaker to break a waste material of gypsum board,   a dry screen;   a disperser;   a rotary drum type washing device;   a dewatering device; and   a collector.   
     
     
         2 . The apparatus as claimed in  claim 1 , further comprising a screen for the separation of gypsum powder from waste material broken by the breaker still containing base paper and gypsum. 
     
     
         3 . The apparatus as claimed in  claim 1 , further comprising a metallic contaminant eliminator. 
     
     
         4 . The apparatus as claimed in  claim 1 , further comprising a heating chamber. 
     
     
         5 . The apparatus as claimed in  claim 1 , further comprising a transporter. 
     
     
         6 . The apparatus as claimed in  claim 1 , wherein the breaker is selected from the group consisting of a compressor, an impactor, a shearing instrument, a friction inducing instrument, a cutting instrument, and a tetra-axial crusher. 
     
     
         7 . The apparatus as claimed in  claim 3 , wherein the metallic contaminant eliminator is a magnetic separator. 
     
     
         8 . The apparatus as claimed in  claim 4 , wherein the heating chamber is selected from the group consisting of a rotary kiln and a vertical furnace. 
     
     
         9 . The apparatus as claimed in  claim 1 , wherein the disperser is an agitation tank. 
     
     
         10 . The apparatus as claimed in  claim 1 , wherein the dry screen is selected from the group consisting of a vibrating screen, a rotating screen, and a centrifugal screen. 
     
     
         11 . The apparatus as claimed in  claim 1 , wherein the dewatering device is selected from the group consisting of a compressing machine and a squeezing machine. 
     
     
         12 . The apparatus as claimed in  claim 1 , wherein the dewatering device is a screw press. 
     
     
         13 . The apparatus as claimed in  claim 1 , wherein the dewatering device is a roller. 
     
     
         14 . The apparatus as claimed in  claim 1 , wherein the dewatering device is a centrifugal machine.