| abstract |
[PROBLEMS] To prevent re-precipitation of a solute in an extract and prevent adhesion of a solid on an inner wall, and suppress an increase in a solid content in a supernatant due to winding of a settled solid concentrate. Provide gravity settling tank. A gravity sedimentation tank 5 includes a cylindrical barrel portion 14 having a central axis in a vertical direction, an inverted conical bottom portion 15 provided at a lower end of the barrel portion 14, and a stirrer 11. (A drive unit is not shown), a stirring blade 16 that stirs the settled solid concentrate, a heater (not shown) that heats the barrel 14 and / or the bottom 15, and a barrel 14 is a lid 17 that seals the upper end of 14, a slurry supply pipe 18 that extends through the lid 17 and extends to the lower part of the body 14, and extends through the lid 17 to the upper part of the body 14. It is provided with a supernatant discharge pipe 20 that is extended and has an opening 19 at the tip for allowing the supernatant separated under pressure to flow in from the horizontal direction. [Selection] Figure 2 |