Method for the settlement and disposal of pumice and a settling device usable for the settlement method.

Abstract

To provide a sedimentation treatment method of pumice not requiring collection of pumice, having a small environmental load, and being capable of efficiently treating pumice, and a sedimentation device usable in a sedimentation treatment method.SOLUTION: In a sedimentation treatment method of pumice, a sedimentation device 10 holds pumice 20 floating on water surface to forcibly submerges it in water. By shrink of air bubbles in the pumice and / or water immersion into the pumice due to action of water pressure, a specific gravity of the pumice is made to be 1.0 or more, and the pumice is sedimented to a water bottom G.SELECTED DRAWING: Figure 1

Claims

1. A method for disposing of pumice by sinking, comprising a sinking device that uses a crane or a crane ship to lift and lower a covering portion capable of covering a plurality of pumice floating on the water surface, The pumice floating on the water surface is held in a state covered by the covering part suspended by the crane or the crane ship, and is forcibly submerged together with the covering part which sinks under its own weight in the water. A method for disposing of pumice by sedimentation, wherein, during forced submersion of the pumice, the specific gravity of the pumice is increased to 1.0 or higher by the action of water pressure, causing the pumice to sink away from the lower surface of the covering due to its own weight, thereby resting the pumice on the bottom of the water.

2. The pumice disposal method according to claim 1, wherein the covering portion is configured in a substantially umbrella shape with the center being the highest point and sloping outwards, and the covering portion comprises a protruding portion having a predetermined length extending downward on the outer circumference of the covering portion and an air vent hole in or near the center.

3. The sinking device includes a vibration unit that vibrates the pumice stone, A method for disposing of pumice by settling, according to claim 1 or 2, wherein the pumice is vibrated within the covering to promote particle crushing of the pumice.

4. The method for disposing of pumice by settling, according to claim 1 or 2, wherein the up-and-down movement of the covering portion is repeated in water up to a predetermined depth, thereby applying pressure changes of pressurization and depressurization to the pumice due to water pressure.

5. The method for disposing of pumice by settling, according to claim 4, wherein the water depth in the body of water where the pumice is to be disposed of by settling is shallower than the minimum required water depth to which the specific gravity of the pumice can be reduced to 1.0 or more in one forced submersion.

6. The method for disposing of pumice by settling according to claim 1 or 2, wherein a weight is provided on the covering portion.

7. A settling device comprising a cover portion usable in the pumice disposal method according to claim 1 or 2.

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