| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for producing, from a waste gypsum board, high-purity reclaimed gypsum capable of yielding a reclaimed gypsum product with sufficient strength. <P>SOLUTION: The method for producing reclaimed gypsum comprises step (A) wherein a waste gypsum board 1 is fed into a crusher 2 and crushed into powder, a step (B) wherein the waste gypsum board powder is fed into a receiving hopper 4 of a rotary kiln 6 by a screw conveyor 3, successively fed into the rotary kiln 6 by a screw feeder 5, heated by a burner 7 to burn and separate foreign matters (ignition loss) contained in the gypsum board and to dry gypsum component, step (C) wherein ashed foreign matters (ignition loss) are collected and removed with a cyclone filter 9, and step (D) wherein refined gypsum 10 obtained in step (C) is mixed with virgin gypsum 11 and alumina cement 12 to obtain the reclaimed gypsum 13. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
