Method and device for mixing gypsum granules derived from waste gypsum board and gypsum slurry

2:

• The mixing method for mixing gypsum granules derived from wasted gypsum boards and gypsum slurry according to claim 1, wherein inner surfaces of the flow path and the pipe are covered with a film or a plate both made of fluororesin and the growth of gypsum scale on the inner surfaces is delayed.

3:

• The mixing method for mixing gypsum granules derived from wasted gypsum boards and gypsum slurry according to claim 1, wherein the gypsum slurry is fed from a feeding pipe to the inlet of said flow path, and the flow path has a larger cross-section than the feeding pipe has such that the upper surface of the gypsum slurry in the flow path is always exposed to air.

5:

• The mixing method for mixing gypsum granules derived from wasted gypsum boards and gypsum slurry according to claim 1, wherein the flow path is straight.

6:

• The mixing method for mixing gypsum granules derived from wasted gypsum boards and gypsum slurry according to claim 5, wherein the flow path has a curved shape without a corner in a cross-section perpendicular to a direction of the flow path.

7:

• The mixing method for mixing gypsum granules derived from wasted gypsum boards and gypsum slurry according to claim 6, wherein the flow path has a constant cross-sectional shape under the upper surface of the slurry from a position where the gypsum granules are fed to the outlet of the flow path.